feat(legacy): port the v0.7 decoder to Rust
Move the frozen v0.7 decoder, dictionary handling, bufferless streaming, and buffered streaming implementation into the Rust legacy module. Keep the historical C translation unit as a declaration-only ABI shim so the existing C callers and build selection remain unchanged. The port preserves the v0.7 entropy and frame boundaries, while fixing the Rust-side literal-tail bookkeeping and making buffered header loading revisit the complete frame header before sizing its rolling buffers. Test Plan: - cargo test --manifest-path rust/Cargo.toml --no-default-features --features decompression,legacy-v07 legacy::zstd_v07::tests - cargo clippy --manifest-path rust/Cargo.toml -- -D warnings - make -B -C programs zstd V=1 - decode a v0.7.5 fixture and compare its 200000-byte output - make -C tests check V=1
This commit is contained in:
@@ -53,3 +53,6 @@ pub mod zstd_v05;
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#[cfg(feature = "legacy-v06")]
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pub mod zstd_v06;
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#[cfg(feature = "legacy-v07")]
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pub mod zstd_v07;
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@@ -0,0 +1,3964 @@
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#![allow(non_snake_case)]
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//! Frozen decoder for the zstd v0.7 format.
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//!
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//! `lib/legacy/zstd_v07.c` is an old, self-contained decoder. This module
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//! keeps that boundary: it owns its FSE, bit-stream, and Huffman state rather
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//! than depending on the current entropy implementations. The public entry
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//! points below retain the C ABI and the context is deliberately malloc/free
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//! allocated so C callers can continue to own an opaque `ZSTDv07_Dctx`.
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use crate::errors::{ERR_getErrorName, ERR_isError, ZstdErrorCode, ERROR};
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use std::os::raw::{c_char, c_uint, c_void};
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use std::ptr;
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const ZSTD_MAGIC_NUMBER: u32 = 0xFD2F_B527;
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const ZSTD_CONTENTSIZE_ERROR: u64 = u64::MAX - 1;
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const BLOCKSIZE: usize = 128 * 1024;
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const MIN_SEQUENCES_SIZE: usize = 1;
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const MIN_CBLOCK_SIZE: usize = 1 + 1 + MIN_SEQUENCES_SIZE;
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const MINMATCH: usize = 3;
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const MAX_ML: u32 = 52;
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const MAX_LL: u32 = 35;
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const MAX_OFF: u32 = 28;
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const ML_FSE_LOG: u32 = 9;
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const LL_FSE_LOG: u32 = 9;
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const OFF_FSE_LOG: u32 = 8;
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const REPCODE_NUM: usize = 3;
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const LONG_NB_SEQ: i32 = 0x7f00;
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const IS_HUF: u8 = 0;
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const IS_PCH: u8 = 1;
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const IS_RAW: u8 = 2;
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const IS_RLE: u8 = 3;
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const FSE_ENCODING_RAW: u32 = 0;
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const FSE_ENCODING_RLE: u32 = 1;
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const FSE_ENCODING_STATIC: u32 = 2;
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const FSE_ENCODING_DYNAMIC: u32 = 3;
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const ZSTD_DICT_MAGIC: u32 = 0xec30_a437;
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const ZSTD_WINDOWLOG_ABSOLUTE_MIN: u32 = 10;
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const FRAME_HEADER_SIZE_MIN: usize = 5;
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const FRAME_HEADER_SIZE_MAX: usize = 18;
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const BLOCK_HEADER_SIZE: usize = 3;
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const WILDCOPY_OVERLENGTH: usize = 8;
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const FSE_MAX_MEMORY_USAGE: u32 = 14;
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const FSE_MAX_SYMBOL_VALUE: u32 = 255;
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const FSE_MAX_TABLELOG: u32 = FSE_MAX_MEMORY_USAGE - 2;
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const FSE_MIN_TABLELOG: u32 = 5;
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const FSE_TABLELOG_ABSOLUTE_MAX: u32 = 15;
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const HUF_MAX_SYMBOL_VALUE: usize = 255;
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const HUF_MAX_TABLELOG: usize = 12;
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const HUF_ABSOLUTE_MAX_TABLELOG: usize = 16;
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const HUF_TABLE_SIZE_U32: usize = 1 + (1 << HUF_MAX_TABLELOG);
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type HufTableX2 = [u32; HUF_TABLE_SIZE_U32];
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#[inline]
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fn huf_max_table_log(desc: u32) -> u32 {
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desc & 0xff
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}
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#[inline]
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fn huf_table_log(desc: u32) -> u32 {
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(desc >> 16) & 0xff
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}
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#[inline]
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fn huf_set_table_type(desc: u32, table_type: u32) -> u32 {
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(desc & !0xff00) | ((table_type & 0xff) << 8)
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}
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#[inline]
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fn huf_set_table_log(desc: u32, table_log: u32) -> u32 {
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(desc & !0xff0000) | ((table_log & 0xff) << 16)
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}
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#[inline]
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fn huf_initial_desc() -> u32 {
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(HUF_MAX_TABLELOG as u32) * 0x0100_0001
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}
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const BT_COMPRESSED: u32 = 0;
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const BT_RAW: u32 = 1;
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const BT_RLE: u32 = 2;
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const BT_END: u32 = 3;
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const DSTREAM_UNFINISHED: u32 = 0;
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const DSTREAM_END_OF_BUFFER: u32 = 1;
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const DSTREAM_COMPLETED: u32 = 2;
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const DSTREAM_TOO_FAR: u32 = 3;
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const USIZE_BITS: u32 = usize::BITS;
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const LL_BITS_TABLE: [u32; MAX_LL as usize + 1] = [
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16,
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];
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const ML_BITS_TABLE: [u32; MAX_ML as usize + 1] = [
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
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];
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const OF_DEFAULT_NORM: [i16; MAX_OFF as usize + 1] = [
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1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
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];
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const LL_DEFAULT_NORM: [i16; MAX_LL as usize + 1] = [
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4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1,
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-1, -1, -1, -1,
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];
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const ML_DEFAULT_NORM: [i16; MAX_ML as usize + 1] = [
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1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,
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];
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const LL_DEFAULT_LOG: u32 = 6;
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const ML_DEFAULT_LOG: u32 = 6;
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const OF_DEFAULT_LOG: u32 = 5;
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#[repr(C)]
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#[derive(Clone, Copy)]
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struct FseDecode {
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new_state: u16,
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symbol: u8,
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nb_bits: u8,
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}
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#[repr(C)]
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struct FseDTableHeader {
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table_log: u16,
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fast_mode: u16,
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}
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#[derive(Clone, Copy)]
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struct DStream {
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bit_container: usize,
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bits_consumed: u32,
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ptr: *const u8,
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start: *const u8,
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}
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#[derive(Clone, Copy)]
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struct FseDState {
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state: usize,
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table: *const FseDecode,
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}
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#[inline]
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fn highbit32(value: u32) -> u32 {
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value.leading_zeros() ^ 31
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}
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#[inline]
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unsafe fn write_le16(dst: *mut u8, value: u16) {
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let bytes = value.to_le_bytes();
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ptr::copy_nonoverlapping(bytes.as_ptr(), dst, 2);
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}
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#[inline]
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unsafe fn zstd_copy8(dst: *mut u8, src: *const u8) {
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ptr::copy(src, dst, 8);
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}
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#[inline]
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unsafe fn zstd_copy4(dst: *mut u8, src: *const u8) {
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ptr::copy(src, dst, 4);
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}
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unsafe fn zstd_wildcopy(dst: *mut u8, src: *const u8, length: isize) {
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let mut op = dst;
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let mut ip = src;
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let end = if length >= 0 {
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(dst as usize).wrapping_add(length as usize)
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} else {
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(dst as usize).wrapping_sub(length.wrapping_neg() as usize)
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};
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loop {
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zstd_copy8(op, ip);
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op = op.add(8);
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ip = ip.add(8);
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if (op as usize) >= end {
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break;
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}
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}
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}
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#[inline]
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unsafe fn read_le16(ptr: *const u8) -> u16 {
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u16::from_le_bytes(std::ptr::read_unaligned(ptr as *const [u8; 2]))
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}
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#[inline]
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unsafe fn read_le32(ptr: *const u8) -> u32 {
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u32::from_le_bytes(std::ptr::read_unaligned(ptr as *const [u8; 4]))
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}
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#[inline]
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unsafe fn read_le64(ptr: *const u8) -> u64 {
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u64::from_le_bytes(std::ptr::read_unaligned(ptr as *const [u8; 8]))
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}
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#[inline]
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unsafe fn read_le_size(ptr: *const u8) -> usize {
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if std::mem::size_of::<usize>() == 4 {
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read_le32(ptr) as usize
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} else {
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u64::from_le_bytes(std::ptr::read_unaligned(ptr as *const [u8; 8])) as usize
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}
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}
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/* ******************************************
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* Backward bit stream (the v0.7 snapshot)
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********************************************/
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unsafe fn init_dstream(stream: &mut DStream, src: *const u8, src_size: usize) -> usize {
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let word = std::mem::size_of::<usize>();
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if src_size == 0 {
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*stream = DStream {
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bit_container: 0,
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bits_consumed: 0,
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ptr: ptr::null(),
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start: ptr::null(),
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};
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return ERROR(ZstdErrorCode::SrcSizeWrong);
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}
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stream.start = src;
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if src_size >= word {
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stream.ptr = src.add(src_size - word);
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stream.bit_container = read_le_size(stream.ptr);
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let end_byte = *src.add(src_size - 1) as u32;
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if end_byte == 0 {
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return ERROR(ZstdErrorCode::Generic);
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}
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stream.bits_consumed = 8 - highbit32(end_byte);
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} else {
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stream.ptr = src;
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stream.bit_container = *src as usize;
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if src_size >= 7 {
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stream.bit_container += (*src.add(6) as usize) << (USIZE_BITS as usize - 16);
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}
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if src_size >= 6 {
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stream.bit_container += (*src.add(5) as usize) << (USIZE_BITS as usize - 24);
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}
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if src_size >= 5 {
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stream.bit_container += (*src.add(4) as usize) << (USIZE_BITS as usize - 32);
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}
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if src_size >= 4 {
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stream.bit_container += (*src.add(3) as usize) << 24;
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}
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if src_size >= 3 {
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stream.bit_container += (*src.add(2) as usize) << 16;
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}
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if src_size >= 2 {
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stream.bit_container += (*src.add(1) as usize) << 8;
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}
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let end_byte = *src.add(src_size - 1) as u32;
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if end_byte == 0 {
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return ERROR(ZstdErrorCode::Generic);
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}
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stream.bits_consumed = 8 - highbit32(end_byte);
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stream.bits_consumed += ((word - src_size) * 8) as u32;
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}
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src_size
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}
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#[inline]
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unsafe fn look_bits(stream: &DStream, nb_bits: u32) -> usize {
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let mask = USIZE_BITS - 1;
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((stream.bit_container << (stream.bits_consumed & mask)) >> 1)
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>> (mask.wrapping_sub(nb_bits) & mask)
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}
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#[inline]
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unsafe fn look_bits_fast(stream: &DStream, nb_bits: u32) -> usize {
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let mask = USIZE_BITS - 1;
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(stream.bit_container << (stream.bits_consumed & mask))
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>> ((mask + 1).wrapping_sub(nb_bits) & mask)
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}
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#[inline]
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fn skip_bits(stream: &mut DStream, nb_bits: u32) {
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stream.bits_consumed = stream.bits_consumed.wrapping_add(nb_bits);
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}
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#[inline]
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unsafe fn read_bits(stream: &mut DStream, nb_bits: u32) -> usize {
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let value = look_bits(stream, nb_bits);
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skip_bits(stream, nb_bits);
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value
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}
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#[inline]
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unsafe fn read_bits_fast(stream: &mut DStream, nb_bits: u32) -> usize {
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let value = look_bits_fast(stream, nb_bits);
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skip_bits(stream, nb_bits);
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value
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}
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unsafe fn reload_dstream(stream: &mut DStream) -> u32 {
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let word = std::mem::size_of::<usize>();
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if stream.bits_consumed > (word * 8) as u32 {
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return DSTREAM_TOO_FAR;
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}
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if (stream.ptr as usize) >= (stream.start as usize).wrapping_add(word) {
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stream.ptr = stream.ptr.sub((stream.bits_consumed >> 3) as usize);
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stream.bits_consumed &= 7;
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stream.bit_container = read_le_size(stream.ptr);
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return DSTREAM_UNFINISHED;
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}
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if stream.ptr == stream.start {
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if stream.bits_consumed < (word * 8) as u32 {
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return DSTREAM_END_OF_BUFFER;
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}
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return DSTREAM_COMPLETED;
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}
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let mut nb_bytes = stream.bits_consumed >> 3;
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let mut result = DSTREAM_UNFINISHED;
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if (stream.ptr as usize).wrapping_sub(nb_bytes as usize) < stream.start as usize {
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nb_bytes = (stream.ptr as usize - stream.start as usize) as u32;
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result = DSTREAM_END_OF_BUFFER;
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}
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stream.ptr = stream.ptr.sub(nb_bytes as usize);
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stream.bits_consumed -= nb_bytes * 8;
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stream.bit_container = read_le_size(stream.ptr);
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result
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}
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#[inline]
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fn end_of_dstream(stream: &DStream) -> bool {
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stream.ptr == stream.start && stream.bits_consumed == USIZE_BITS
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}
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/* ******************************************
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* FSE decoding
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********************************************/
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#[inline]
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fn fse_table_step(table_size: u32) -> u32 {
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(table_size >> 1) + (table_size >> 3) + 3
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}
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#[allow(clippy::needless_range_loop)]
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unsafe fn fse_build_dtable(
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dt: &mut [u32],
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normalized_counter: &[i16],
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max_symbol_value: u32,
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table_log: u32,
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) -> usize {
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if max_symbol_value > FSE_MAX_SYMBOL_VALUE {
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return ERROR(ZstdErrorCode::MaxSymbolValueTooLarge);
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}
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if table_log > FSE_MAX_TABLELOG {
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return ERROR(ZstdErrorCode::TableLogTooLarge);
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}
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let table_size = 1u32 << table_log;
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let table_mask = table_size - 1;
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let step = fse_table_step(table_size);
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let mut symbol_next = [0u16; 256];
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let table_header = dt.as_mut_ptr() as *mut FseDTableHeader;
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let table_decode = dt.as_mut_ptr().add(1) as *mut FseDecode;
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let mut position = 0u32;
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let mut high_threshold = table_size - 1;
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let large_limit = (1i32 << (table_log - 1)) as i16;
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let mut no_large = 1u16;
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(*table_header).table_log = table_log as u16;
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for symbol in 0..=max_symbol_value as usize {
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let count = normalized_counter[symbol];
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if count == -1 {
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(*table_decode.add(high_threshold as usize)).symbol = symbol as u8;
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high_threshold = high_threshold.wrapping_sub(1);
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symbol_next[symbol] = 1;
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} else {
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if count >= large_limit {
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no_large = 0;
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}
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symbol_next[symbol] = count as u16;
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}
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}
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for symbol in 0..=max_symbol_value as usize {
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let count = normalized_counter[symbol];
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for _ in 0..count.max(0) {
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(*table_decode.add(position as usize)).symbol = symbol as u8;
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position = (position + step) & table_mask;
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while position > high_threshold {
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position = (position + step) & table_mask;
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}
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}
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}
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if position != 0 {
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return ERROR(ZstdErrorCode::Generic);
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}
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for index in 0..table_size as usize {
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let symbol = (*table_decode.add(index)).symbol as usize;
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let next_state = symbol_next[symbol];
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symbol_next[symbol] = symbol_next[symbol].wrapping_add(1);
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let nb_bits = (table_log - highbit32(next_state as u32)) as u8;
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(*table_decode.add(index)).nb_bits = nb_bits;
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(*table_decode.add(index)).new_state =
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(((next_state as u32) << nb_bits).wrapping_sub(table_size)) as u16;
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}
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(*table_header).fast_mode = no_large;
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn fse_read_ncount(
|
||||
normalized_counter: &mut [i16; 256],
|
||||
max_sv: &mut u32,
|
||||
table_log: &mut u32,
|
||||
header: *const u8,
|
||||
header_size: usize,
|
||||
) -> usize {
|
||||
if header_size < 4 {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let start = header as usize;
|
||||
let end = start.wrapping_add(header_size);
|
||||
let mut ip = header;
|
||||
let mut char_num = 0u32;
|
||||
let mut previous_zero = false;
|
||||
let mut bit_stream = read_le32(ip);
|
||||
let mut nb_bits = ((bit_stream & 0xF) + FSE_MIN_TABLELOG) as i32;
|
||||
if nb_bits > FSE_TABLELOG_ABSOLUTE_MAX as i32 {
|
||||
return ERROR(ZstdErrorCode::TableLogTooLarge);
|
||||
}
|
||||
bit_stream >>= 4;
|
||||
let mut bit_count = 4i32;
|
||||
*table_log = nb_bits as u32;
|
||||
let mut remaining = (1i32 << nb_bits) + 1;
|
||||
let mut threshold = 1i32 << nb_bits;
|
||||
nb_bits += 1;
|
||||
|
||||
while remaining > 1 && char_num <= *max_sv {
|
||||
if previous_zero {
|
||||
let mut n0 = char_num;
|
||||
while bit_stream & 0xFFFF == 0xFFFF {
|
||||
n0 += 24;
|
||||
if (ip as usize) < end.wrapping_sub(5) {
|
||||
ip = ip.add(2);
|
||||
bit_stream = read_le32(ip) >> bit_count;
|
||||
} else {
|
||||
bit_stream >>= 16;
|
||||
bit_count += 16;
|
||||
}
|
||||
}
|
||||
while bit_stream & 3 == 3 {
|
||||
n0 += 3;
|
||||
bit_stream >>= 2;
|
||||
bit_count += 2;
|
||||
}
|
||||
n0 += bit_stream & 3;
|
||||
bit_count += 2;
|
||||
if n0 > *max_sv {
|
||||
return ERROR(ZstdErrorCode::MaxSymbolValueTooSmall);
|
||||
}
|
||||
while char_num < n0 {
|
||||
normalized_counter[char_num as usize] = 0;
|
||||
char_num += 1;
|
||||
}
|
||||
if (ip as usize) <= end.wrapping_sub(7)
|
||||
|| (ip as usize).wrapping_add((bit_count >> 3) as usize) <= end.wrapping_sub(4)
|
||||
{
|
||||
ip = ip.add((bit_count >> 3) as usize);
|
||||
bit_count &= 7;
|
||||
bit_stream = read_le32(ip) >> bit_count;
|
||||
} else {
|
||||
bit_stream >>= 2;
|
||||
}
|
||||
}
|
||||
|
||||
let max = ((2 * threshold - 1) - remaining) as i16;
|
||||
let mut count: i16;
|
||||
if (bit_stream & (threshold - 1) as u32) < max as i32 as u32 {
|
||||
count = (bit_stream & (threshold - 1) as u32) as u16 as i16;
|
||||
bit_count += nb_bits - 1;
|
||||
} else {
|
||||
count = (bit_stream & (2 * threshold - 1) as u32) as u16 as i16;
|
||||
if count as i32 >= threshold {
|
||||
count = (count as i32 - max as i32) as i16;
|
||||
}
|
||||
bit_count += nb_bits;
|
||||
}
|
||||
count = count.wrapping_sub(1);
|
||||
remaining -= (count as i32).abs();
|
||||
normalized_counter[char_num as usize] = count;
|
||||
char_num += 1;
|
||||
previous_zero = count == 0;
|
||||
while remaining < threshold {
|
||||
nb_bits -= 1;
|
||||
threshold >>= 1;
|
||||
}
|
||||
|
||||
if (ip as usize) <= end.wrapping_sub(7)
|
||||
|| (ip as usize).wrapping_add((bit_count >> 3) as usize) <= end.wrapping_sub(4)
|
||||
{
|
||||
ip = ip.add((bit_count >> 3) as usize);
|
||||
bit_count &= 7;
|
||||
} else {
|
||||
bit_count -= (8 * (end.wrapping_sub(4) as isize - ip as usize as isize)) as i32;
|
||||
ip = (end - 4) as *const u8;
|
||||
}
|
||||
bit_stream = read_le32(ip) >> (bit_count & 31);
|
||||
}
|
||||
|
||||
if remaining != 1 {
|
||||
return ERROR(ZstdErrorCode::Generic);
|
||||
}
|
||||
*max_sv = char_num - 1;
|
||||
ip = ip.add(((bit_count + 7) >> 3) as usize);
|
||||
if (ip as usize).wrapping_sub(start) > header_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
(ip as usize).wrapping_sub(start)
|
||||
}
|
||||
|
||||
unsafe fn fse_build_dtable_rle(dt: &mut [u32], symbol: u8) -> usize {
|
||||
let header = dt.as_mut_ptr() as *mut FseDTableHeader;
|
||||
let cell = dt.as_mut_ptr().add(1) as *mut FseDecode;
|
||||
(*header).table_log = 0;
|
||||
(*header).fast_mode = 0;
|
||||
(*cell).new_state = 0;
|
||||
(*cell).symbol = symbol;
|
||||
(*cell).nb_bits = 0;
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn fse_init_dstate(state: &mut FseDState, stream: &mut DStream, dt: *const u32) {
|
||||
let header = dt as *const FseDTableHeader;
|
||||
state.state = read_bits(stream, (*header).table_log as u32);
|
||||
reload_dstream(stream);
|
||||
state.table = dt.add(1) as *const FseDecode;
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn fse_peek_symbol(state: &FseDState) -> u8 {
|
||||
(*state.table.add(state.state)).symbol
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn fse_update_state(state: &mut FseDState, stream: &mut DStream) {
|
||||
let info = *state.table.add(state.state);
|
||||
let low_bits = read_bits(stream, info.nb_bits as u32);
|
||||
state.state = (info.new_state as usize).wrapping_add(low_bits);
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn fse_decode_symbol(state: &mut FseDState, stream: &mut DStream, fast: bool) -> u8 {
|
||||
let info = *state.table.add(state.state);
|
||||
let low_bits = if fast {
|
||||
read_bits_fast(stream, info.nb_bits as u32)
|
||||
} else {
|
||||
read_bits(stream, info.nb_bits as u32)
|
||||
};
|
||||
state.state = (info.new_state as usize).wrapping_add(low_bits);
|
||||
info.symbol
|
||||
}
|
||||
|
||||
unsafe fn fse_decompress_using_dtable(
|
||||
dst: *mut u8,
|
||||
max_dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
dt: &[u32],
|
||||
) -> usize {
|
||||
let header = &*(dt.as_ptr() as *const FseDTableHeader);
|
||||
let fast = header.fast_mode != 0;
|
||||
let start = dst;
|
||||
let end_addr = (dst as usize).wrapping_add(max_dst_size);
|
||||
let limit_addr = end_addr.wrapping_sub(3);
|
||||
let mut op = dst;
|
||||
let mut stream = DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
};
|
||||
let mut state1 = FseDState {
|
||||
state: 0,
|
||||
table: ptr::null(),
|
||||
};
|
||||
let mut state2 = state1;
|
||||
let error = init_dstream(&mut stream, c_src, c_src_size);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
fse_init_dstate(&mut state1, &mut stream, dt.as_ptr());
|
||||
fse_init_dstate(&mut state2, &mut stream, dt.as_ptr());
|
||||
|
||||
const RELOAD_2: bool = FSE_MAX_TABLELOG * 2 + 7 > USIZE_BITS;
|
||||
const RELOAD_4: bool = FSE_MAX_TABLELOG * 4 + 7 > USIZE_BITS;
|
||||
while reload_dstream(&mut stream) == DSTREAM_UNFINISHED && (op as usize) < limit_addr {
|
||||
*op = fse_decode_symbol(&mut state1, &mut stream, fast);
|
||||
if RELOAD_2 {
|
||||
reload_dstream(&mut stream);
|
||||
}
|
||||
*op.add(1) = fse_decode_symbol(&mut state2, &mut stream, fast);
|
||||
if RELOAD_4 && reload_dstream(&mut stream) > DSTREAM_UNFINISHED {
|
||||
op = op.add(2);
|
||||
break;
|
||||
}
|
||||
*op.add(2) = fse_decode_symbol(&mut state1, &mut stream, fast);
|
||||
if RELOAD_2 {
|
||||
reload_dstream(&mut stream);
|
||||
}
|
||||
*op.add(3) = fse_decode_symbol(&mut state2, &mut stream, fast);
|
||||
op = op.add(4);
|
||||
}
|
||||
|
||||
loop {
|
||||
if reload_dstream(&mut stream) > DSTREAM_COMPLETED
|
||||
|| op as usize == end_addr
|
||||
|| (end_of_dstream(&stream) && (fast || state1.state == 0))
|
||||
{
|
||||
break;
|
||||
}
|
||||
*op = fse_decode_symbol(&mut state1, &mut stream, fast);
|
||||
op = op.add(1);
|
||||
if reload_dstream(&mut stream) > DSTREAM_COMPLETED
|
||||
|| op as usize == end_addr
|
||||
|| (end_of_dstream(&stream) && (fast || state2.state == 0))
|
||||
{
|
||||
break;
|
||||
}
|
||||
*op = fse_decode_symbol(&mut state2, &mut stream, fast);
|
||||
op = op.add(1);
|
||||
}
|
||||
|
||||
if end_of_dstream(&stream) && state1.state == 0 && state2.state == 0 {
|
||||
return (op as usize) - (start as usize);
|
||||
}
|
||||
if op as usize == end_addr {
|
||||
return ERROR(ZstdErrorCode::DstSizeTooSmall);
|
||||
}
|
||||
ERROR(ZstdErrorCode::CorruptionDetected)
|
||||
}
|
||||
|
||||
unsafe fn fse_decompress(
|
||||
dst: *mut u8,
|
||||
max_dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
) -> usize {
|
||||
if c_src_size < 2 {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let mut counters = [0i16; 256];
|
||||
let mut max_symbol = FSE_MAX_SYMBOL_VALUE;
|
||||
let mut table_log = 0;
|
||||
let header_size = fse_read_ncount(
|
||||
&mut counters,
|
||||
&mut max_symbol,
|
||||
&mut table_log,
|
||||
c_src,
|
||||
c_src_size,
|
||||
);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if header_size >= c_src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let mut table = vec![0u32; 1 + (1usize << FSE_MAX_TABLELOG)];
|
||||
let error = fse_build_dtable(&mut table, &counters, max_symbol, table_log);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
fse_decompress_using_dtable(
|
||||
dst,
|
||||
max_dst_size,
|
||||
c_src.add(header_size),
|
||||
c_src_size - header_size,
|
||||
&table,
|
||||
)
|
||||
}
|
||||
|
||||
/* ******************************************
|
||||
* Huffman decoding
|
||||
********************************************/
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
struct HufDEltX2 {
|
||||
byte: u8,
|
||||
nb_bits: u8,
|
||||
}
|
||||
|
||||
#[allow(clippy::manual_div_ceil)]
|
||||
unsafe fn huf_read_stats(
|
||||
huff_weight: &mut [u8; HUF_MAX_SYMBOL_VALUE + 1],
|
||||
rank_stats: &mut [u32; HUF_ABSOLUTE_MAX_TABLELOG + 1],
|
||||
nb_symbols: &mut u32,
|
||||
table_log: &mut u32,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size == 0 {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let mut i_size = *src as usize;
|
||||
let o_size: usize;
|
||||
if i_size >= 128 {
|
||||
if i_size >= 242 {
|
||||
const RLE_LENGTHS: [usize; 14] = [1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128];
|
||||
let index = i_size - 242;
|
||||
if index >= RLE_LENGTHS.len() {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
o_size = RLE_LENGTHS[index];
|
||||
huff_weight.fill(1);
|
||||
i_size = 0;
|
||||
} else {
|
||||
o_size = i_size - 127;
|
||||
i_size = (o_size + 1) / 2;
|
||||
if i_size + 1 > src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
if o_size >= huff_weight.len() {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let weights = src.add(1);
|
||||
let mut n = 0;
|
||||
while n < o_size {
|
||||
huff_weight[n] = *weights.add(n / 2) >> 4;
|
||||
if n + 1 < huff_weight.len() {
|
||||
huff_weight[n + 1] = *weights.add(n / 2) & 15;
|
||||
}
|
||||
n += 2;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
if i_size + 1 > src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let decoded = fse_decompress(
|
||||
huff_weight.as_mut_ptr(),
|
||||
huff_weight.len() - 1,
|
||||
src.add(1),
|
||||
i_size,
|
||||
);
|
||||
if ERR_isError(decoded) {
|
||||
return decoded;
|
||||
}
|
||||
o_size = decoded;
|
||||
}
|
||||
|
||||
rank_stats.fill(0);
|
||||
let mut weight_total = 0u32;
|
||||
for &weight in huff_weight.iter().take(o_size) {
|
||||
if weight as usize >= HUF_ABSOLUTE_MAX_TABLELOG {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
rank_stats[weight as usize] += 1;
|
||||
weight_total += (1u32 << weight) >> 1;
|
||||
}
|
||||
if weight_total == 0 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let calculated_log = highbit32(weight_total) + 1;
|
||||
if calculated_log as usize > HUF_ABSOLUTE_MAX_TABLELOG {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let total = 1u32 << calculated_log;
|
||||
let rest = total - weight_total;
|
||||
if rest == 0 || (1u32 << highbit32(rest)) != rest {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let last_weight = highbit32(rest) + 1;
|
||||
huff_weight[o_size] = last_weight as u8;
|
||||
rank_stats[last_weight as usize] += 1;
|
||||
if rank_stats[1] < 2 || (rank_stats[1] & 1) != 0 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
*nb_symbols = (o_size + 1) as u32;
|
||||
*table_log = calculated_log;
|
||||
i_size + 1
|
||||
}
|
||||
|
||||
#[allow(clippy::needless_range_loop)]
|
||||
unsafe fn huf_read_dtable_x2(dtable: &mut HufTableX2, src: *const u8, src_size: usize) -> usize {
|
||||
let mut huff_weight = [0u8; HUF_MAX_SYMBOL_VALUE + 1];
|
||||
let mut rank_val = [0u32; HUF_ABSOLUTE_MAX_TABLELOG + 1];
|
||||
let mut nb_symbols = 0u32;
|
||||
let mut table_log = 0u32;
|
||||
let i_size = huf_read_stats(
|
||||
&mut huff_weight,
|
||||
&mut rank_val,
|
||||
&mut nb_symbols,
|
||||
&mut table_log,
|
||||
src,
|
||||
src_size,
|
||||
);
|
||||
if ERR_isError(i_size) {
|
||||
return i_size;
|
||||
}
|
||||
if table_log > huf_max_table_log(dtable[0]) + 1 {
|
||||
return ERROR(ZstdErrorCode::TableLogTooLarge);
|
||||
}
|
||||
dtable[0] = huf_set_table_log(huf_set_table_type(dtable[0], 0), table_log);
|
||||
|
||||
let mut next_rank_start = 0u32;
|
||||
for weight in 1..=table_log as usize {
|
||||
let current = next_rank_start;
|
||||
next_rank_start += rank_val[weight] << (weight - 1);
|
||||
rank_val[weight] = current;
|
||||
}
|
||||
let cells = dtable.as_mut_ptr().add(1) as *mut HufDEltX2;
|
||||
for (symbol, &weight) in huff_weight.iter().enumerate().take(nb_symbols as usize) {
|
||||
let weight = weight as usize;
|
||||
let length = (1u32 << weight) >> 1;
|
||||
let entry = HufDEltX2 {
|
||||
byte: symbol as u8,
|
||||
nb_bits: (table_log + 1 - weight as u32) as u8,
|
||||
};
|
||||
for index in rank_val[weight]..rank_val[weight] + length {
|
||||
*cells.add(index as usize) = entry;
|
||||
}
|
||||
rank_val[weight] += length;
|
||||
}
|
||||
i_size
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_symbol(stream: &mut DStream, table: *const HufDEltX2, table_log: u32) -> u8 {
|
||||
let entry = *table.add(look_bits_fast(stream, table_log));
|
||||
skip_bits(stream, entry.nb_bits as u32);
|
||||
entry.byte
|
||||
}
|
||||
|
||||
unsafe fn huf_decode_stream(
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
stream: &mut DStream,
|
||||
table: *const HufDEltX2,
|
||||
table_log: u32,
|
||||
) -> usize {
|
||||
let start = dst;
|
||||
let end = dst.add(dst_size);
|
||||
let mut op = dst;
|
||||
|
||||
/* The v0.7 C decoder uses a 4-symbol unrolled loop followed by a tail.
|
||||
* Decoding one symbol at a time has the same state transitions and keeps
|
||||
* the same stop-bit validation while remaining easy to audit. */
|
||||
while op < end {
|
||||
let status = reload_dstream(stream);
|
||||
if status == DSTREAM_TOO_FAR || (status == DSTREAM_COMPLETED && op < end) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
*op = huf_decode_symbol(stream, table, table_log);
|
||||
op = op.add(1);
|
||||
}
|
||||
if !end_of_dstream(stream) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
(op as usize) - (start as usize)
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress4x2_using_dtable(
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
dtable: &HufTableX2,
|
||||
) -> usize {
|
||||
if c_src_size < 10 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let length1 = read_le16(c_src) as usize;
|
||||
let length2 = read_le16(c_src.add(2)) as usize;
|
||||
let length3 = read_le16(c_src.add(4)) as usize;
|
||||
let payload = length1
|
||||
.checked_add(length2)
|
||||
.and_then(|v| v.checked_add(length3))
|
||||
.and_then(|v| v.checked_add(6));
|
||||
let payload = match payload {
|
||||
Some(value) if value <= c_src_size => value,
|
||||
_ => return ERROR(ZstdErrorCode::CorruptionDetected),
|
||||
};
|
||||
let length4 = c_src_size - payload;
|
||||
let stream1 = c_src.add(6);
|
||||
let stream2 = stream1.add(length1);
|
||||
let stream3 = stream2.add(length2);
|
||||
let stream4 = stream3.add(length3);
|
||||
let segment = dst_size.div_ceil(4);
|
||||
let starts = [
|
||||
dst,
|
||||
dst.add(segment),
|
||||
dst.add(segment * 2),
|
||||
dst.add(segment * 3),
|
||||
];
|
||||
let sizes = [
|
||||
segment.min(dst_size),
|
||||
segment.min(dst_size.saturating_sub(segment)),
|
||||
segment.min(dst_size.saturating_sub(segment * 2)),
|
||||
dst_size.saturating_sub(segment * 3),
|
||||
];
|
||||
let lengths = [length1, length2, length3, length4];
|
||||
let sources = [stream1, stream2, stream3, stream4];
|
||||
let table = dtable.as_ptr().add(1) as *const HufDEltX2;
|
||||
let table_log = huf_table_log(dtable[0]);
|
||||
for index in 0..4 {
|
||||
let mut stream = DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
};
|
||||
let error = init_dstream(&mut stream, sources[index], lengths[index]);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
let decoded = huf_decode_stream(starts[index], sizes[index], &mut stream, table, table_log);
|
||||
if ERR_isError(decoded) {
|
||||
return decoded;
|
||||
}
|
||||
}
|
||||
dst_size
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress1x2_using_dtable(
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
dtable: &HufTableX2,
|
||||
) -> usize {
|
||||
let stream = DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
};
|
||||
let mut stream = stream;
|
||||
let error = init_dstream(&mut stream, c_src, c_src_size);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
let table = dtable.as_ptr().add(1) as *const HufDEltX2;
|
||||
let decoded = huf_decode_stream(dst, dst_size, &mut stream, table, huf_table_log(dtable[0]));
|
||||
if ERR_isError(decoded) {
|
||||
return decoded;
|
||||
}
|
||||
if !end_of_dstream(&stream) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dst_size
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
struct HufDEltX4 {
|
||||
sequence: u16,
|
||||
nb_bits: u8,
|
||||
length: u8,
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
struct SortedSymbol {
|
||||
symbol: u8,
|
||||
weight: u8,
|
||||
}
|
||||
|
||||
type RankVal = [[u32; HUF_ABSOLUTE_MAX_TABLELOG + 1]; HUF_ABSOLUTE_MAX_TABLELOG];
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_set_dtable_x4(
|
||||
dtable: *mut HufDEltX4,
|
||||
index: usize,
|
||||
sequence: u16,
|
||||
nb_bits: u32,
|
||||
length: u8,
|
||||
) {
|
||||
let entry = dtable.add(index);
|
||||
write_le16(entry.cast::<u8>(), sequence);
|
||||
(*entry).nb_bits = nb_bits as u8;
|
||||
(*entry).length = length;
|
||||
}
|
||||
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
unsafe fn huf_fill_dtable_x4_level2(
|
||||
dtable: *mut HufDEltX4,
|
||||
size_log: u32,
|
||||
consumed: u32,
|
||||
rank_val_origin: &[u32; HUF_ABSOLUTE_MAX_TABLELOG + 1],
|
||||
min_weight: usize,
|
||||
sorted_symbols: &[SortedSymbol; HUF_MAX_SYMBOL_VALUE + 1],
|
||||
sorted_start: usize,
|
||||
sorted_list_size: usize,
|
||||
nb_bits_baseline: u32,
|
||||
base_seq: u16,
|
||||
) {
|
||||
let mut rank_val = *rank_val_origin;
|
||||
|
||||
if min_weight > 1 {
|
||||
let skip_size = rank_val[min_weight] as usize;
|
||||
for index in 0..skip_size {
|
||||
huf_set_dtable_x4(dtable, index, base_seq, consumed, 1);
|
||||
}
|
||||
}
|
||||
|
||||
for item in 0..sorted_list_size {
|
||||
let sorted = sorted_symbols[sorted_start + item];
|
||||
let symbol = sorted.symbol as u32;
|
||||
let weight = sorted.weight as usize;
|
||||
let nb_bits = nb_bits_baseline - weight as u32;
|
||||
let length = 1u32 << (size_log - nb_bits);
|
||||
let start = rank_val[weight] as usize;
|
||||
let end = start + length as usize;
|
||||
let sequence = base_seq.wrapping_add((symbol << 8) as u16);
|
||||
for index in start..end {
|
||||
huf_set_dtable_x4(dtable, index, sequence, nb_bits + consumed, 2);
|
||||
}
|
||||
rank_val[weight] = rank_val[weight].wrapping_add(length);
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
unsafe fn huf_fill_dtable_x4(
|
||||
dtable: *mut HufDEltX4,
|
||||
target_log: u32,
|
||||
sorted_list: &[SortedSymbol; HUF_MAX_SYMBOL_VALUE + 1],
|
||||
sorted_list_size: usize,
|
||||
rank_start0: &[u32; HUF_ABSOLUTE_MAX_TABLELOG + 2],
|
||||
rank_val_origin: &RankVal,
|
||||
max_weight: u32,
|
||||
nb_bits_baseline: u32,
|
||||
) {
|
||||
let mut rank_val = rank_val_origin[0];
|
||||
let scale_log = nb_bits_baseline as i32 - target_log as i32;
|
||||
let min_bits = nb_bits_baseline - max_weight;
|
||||
|
||||
for item in 0..sorted_list_size {
|
||||
let sorted = sorted_list[item];
|
||||
let symbol = sorted.symbol as u16;
|
||||
let weight = sorted.weight as usize;
|
||||
let nb_bits = nb_bits_baseline - weight as u32;
|
||||
let start = rank_val[weight] as usize;
|
||||
let length = 1u32 << (target_log - nb_bits);
|
||||
|
||||
if target_log - nb_bits >= min_bits {
|
||||
let mut min_weight = nb_bits as i32 + scale_log;
|
||||
if min_weight < 1 {
|
||||
min_weight = 1;
|
||||
}
|
||||
let min_weight = min_weight as usize;
|
||||
let sorted_rank = rank_start0[min_weight + 1] as usize;
|
||||
huf_fill_dtable_x4_level2(
|
||||
dtable.add(start),
|
||||
target_log - nb_bits,
|
||||
nb_bits,
|
||||
&rank_val_origin[nb_bits as usize],
|
||||
min_weight,
|
||||
sorted_list,
|
||||
sorted_rank,
|
||||
sorted_list_size - sorted_rank,
|
||||
nb_bits_baseline,
|
||||
symbol,
|
||||
);
|
||||
} else {
|
||||
let end = start + length as usize;
|
||||
for index in start..end {
|
||||
huf_set_dtable_x4(dtable, index, symbol, nb_bits, 1);
|
||||
}
|
||||
}
|
||||
rank_val[weight] = rank_val[weight].wrapping_add(length);
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::needless_range_loop)]
|
||||
unsafe fn huf_read_dtable_x4(
|
||||
dtable: &mut [u32; 1 + (1 << HUF_MAX_TABLELOG)],
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
let mut weight_list = [0u8; HUF_MAX_SYMBOL_VALUE + 1];
|
||||
let mut sorted_symbols = [SortedSymbol {
|
||||
symbol: 0,
|
||||
weight: 0,
|
||||
}; HUF_MAX_SYMBOL_VALUE + 1];
|
||||
let mut rank_stats = [0u32; HUF_ABSOLUTE_MAX_TABLELOG + 1];
|
||||
let mut rank_start0 = [0u32; HUF_ABSOLUTE_MAX_TABLELOG + 2];
|
||||
let mut rank_val = [[0u32; HUF_ABSOLUTE_MAX_TABLELOG + 1]; HUF_ABSOLUTE_MAX_TABLELOG];
|
||||
let mut nb_symbols = 0u32;
|
||||
let mut table_log = 0u32;
|
||||
let mem_log = huf_max_table_log(dtable[0]);
|
||||
|
||||
if mem_log > HUF_ABSOLUTE_MAX_TABLELOG as u32 {
|
||||
return ERROR(ZstdErrorCode::TableLogTooLarge);
|
||||
}
|
||||
|
||||
let i_size = huf_read_stats(
|
||||
&mut weight_list,
|
||||
&mut rank_stats,
|
||||
&mut nb_symbols,
|
||||
&mut table_log,
|
||||
src,
|
||||
src_size,
|
||||
);
|
||||
if ERR_isError(i_size) {
|
||||
return i_size;
|
||||
}
|
||||
if table_log > mem_log {
|
||||
return ERROR(ZstdErrorCode::TableLogTooLarge);
|
||||
}
|
||||
dtable[0] = huf_set_table_log(huf_set_table_type(dtable[0], 1), table_log);
|
||||
|
||||
let mut max_weight = table_log as usize;
|
||||
loop {
|
||||
if rank_stats[max_weight] != 0 {
|
||||
break;
|
||||
}
|
||||
if max_weight == 0 {
|
||||
return ERROR(ZstdErrorCode::Generic);
|
||||
}
|
||||
max_weight -= 1;
|
||||
}
|
||||
|
||||
let mut next_rank_start = 0u32;
|
||||
for weight in 1..=max_weight {
|
||||
let current = next_rank_start;
|
||||
next_rank_start = next_rank_start.wrapping_add(rank_stats[weight]);
|
||||
rank_start0[weight + 1] = current;
|
||||
}
|
||||
rank_start0[0] = next_rank_start;
|
||||
let size_of_sort = next_rank_start as usize;
|
||||
|
||||
for symbol in 0..nb_symbols as usize {
|
||||
let weight = weight_list[symbol] as usize;
|
||||
let rank = rank_start0[weight + 1] as usize;
|
||||
sorted_symbols[rank] = SortedSymbol {
|
||||
symbol: symbol as u8,
|
||||
weight: weight as u8,
|
||||
};
|
||||
rank_start0[weight + 1] = rank as u32 + 1;
|
||||
}
|
||||
rank_start0[1] = 0;
|
||||
|
||||
let min_bits = table_log + 1 - max_weight as u32;
|
||||
let rescale = (mem_log as i32 - table_log as i32) - 1;
|
||||
let mut next_rank_val = 0u32;
|
||||
for weight in 1..=max_weight {
|
||||
let current = next_rank_val;
|
||||
let shift = (weight as i32 + rescale) as u32;
|
||||
next_rank_val = next_rank_val.wrapping_add(rank_stats[weight] << shift);
|
||||
rank_val[0][weight] = current;
|
||||
}
|
||||
if min_bits <= mem_log.saturating_sub(min_bits) {
|
||||
for consumed in min_bits..=mem_log - min_bits {
|
||||
for weight in 1..=max_weight {
|
||||
rank_val[consumed as usize][weight] = rank_val[0][weight] >> consumed;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let table = dtable.as_mut_ptr().add(1) as *mut HufDEltX4;
|
||||
huf_fill_dtable_x4(
|
||||
table,
|
||||
mem_log,
|
||||
&sorted_symbols,
|
||||
size_of_sort,
|
||||
&rank_start0,
|
||||
&rank_val,
|
||||
max_weight as u32,
|
||||
table_log + 1,
|
||||
);
|
||||
i_size
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_symbol_x4(
|
||||
op: &mut *mut u8,
|
||||
stream: &mut DStream,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) -> u32 {
|
||||
let value = look_bits_fast(stream, table_log);
|
||||
let entry = dtable.add(value);
|
||||
ptr::copy(entry.cast::<u8>(), *op, 2);
|
||||
skip_bits(stream, (*entry).nb_bits as u32);
|
||||
let length = (*entry).length as u32;
|
||||
*op = (*op).add(length as usize);
|
||||
length
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_last_symbol_x4(
|
||||
op: *mut u8,
|
||||
stream: &mut DStream,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) -> u32 {
|
||||
let value = look_bits_fast(stream, table_log);
|
||||
let entry = dtable.add(value);
|
||||
*op = read_le16(entry.cast::<u8>()) as u8;
|
||||
if (*entry).length == 1 {
|
||||
skip_bits(stream, (*entry).nb_bits as u32);
|
||||
} else if stream.bits_consumed < USIZE_BITS {
|
||||
skip_bits(stream, (*entry).nb_bits as u32);
|
||||
if stream.bits_consumed > USIZE_BITS {
|
||||
stream.bits_consumed = USIZE_BITS;
|
||||
}
|
||||
}
|
||||
1
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_symbol_x4_0(
|
||||
op: &mut *mut u8,
|
||||
stream: &mut DStream,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) {
|
||||
huf_decode_symbol_x4(op, stream, dtable, table_log);
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_symbol_x4_1(
|
||||
op: &mut *mut u8,
|
||||
stream: &mut DStream,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) {
|
||||
if USIZE_BITS == 64 || HUF_MAX_TABLELOG <= 12 {
|
||||
huf_decode_symbol_x4(op, stream, dtable, table_log);
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_decode_symbol_x4_2(
|
||||
op: &mut *mut u8,
|
||||
stream: &mut DStream,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) {
|
||||
if USIZE_BITS == 64 {
|
||||
huf_decode_symbol_x4(op, stream, dtable, table_log);
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn huf_decode_stream_x4(
|
||||
mut p: *mut u8,
|
||||
stream: &mut DStream,
|
||||
p_end: *mut u8,
|
||||
dtable: *const HufDEltX4,
|
||||
table_log: u32,
|
||||
) -> usize {
|
||||
let p_start = p;
|
||||
while reload_dstream(stream) == DSTREAM_UNFINISHED
|
||||
&& (p as usize) < (p_end as usize).wrapping_sub(7)
|
||||
{
|
||||
huf_decode_symbol_x4_2(&mut p, stream, dtable, table_log);
|
||||
huf_decode_symbol_x4_1(&mut p, stream, dtable, table_log);
|
||||
huf_decode_symbol_x4_2(&mut p, stream, dtable, table_log);
|
||||
huf_decode_symbol_x4_0(&mut p, stream, dtable, table_log);
|
||||
}
|
||||
while reload_dstream(stream) == DSTREAM_UNFINISHED
|
||||
&& (p as usize) <= (p_end as usize).wrapping_sub(2)
|
||||
{
|
||||
huf_decode_symbol_x4_0(&mut p, stream, dtable, table_log);
|
||||
}
|
||||
while (p as usize) <= (p_end as usize).wrapping_sub(2) {
|
||||
huf_decode_symbol_x4_0(&mut p, stream, dtable, table_log);
|
||||
}
|
||||
if (p as usize) < p_end as usize {
|
||||
p = p.add(huf_decode_last_symbol_x4(p, stream, dtable, table_log) as usize);
|
||||
}
|
||||
(p as usize).wrapping_sub(p_start as usize)
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress4x4_using_dtable(
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
dtable: &[u32; 1 + (1 << HUF_MAX_TABLELOG)],
|
||||
) -> usize {
|
||||
if c_src_size < 10 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let length1 = read_le16(c_src) as usize;
|
||||
let length2 = read_le16(c_src.add(2)) as usize;
|
||||
let length3 = read_le16(c_src.add(4)) as usize;
|
||||
let total = length1
|
||||
.wrapping_add(length2)
|
||||
.wrapping_add(length3)
|
||||
.wrapping_add(6);
|
||||
let length4 = c_src_size.wrapping_sub(total);
|
||||
if length4 > c_src_size {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
|
||||
let streams = [
|
||||
c_src.add(6),
|
||||
c_src.add(6 + length1),
|
||||
c_src.add(6 + length1 + length2),
|
||||
c_src.add(6 + length1 + length2 + length3),
|
||||
];
|
||||
let lengths = [length1, length2, length3, length4];
|
||||
let segment = dst_size.wrapping_add(3) / 4;
|
||||
let starts = [
|
||||
dst,
|
||||
dst.add(segment),
|
||||
dst.add(segment * 2),
|
||||
dst.add(segment * 3),
|
||||
];
|
||||
let sizes = [
|
||||
segment.min(dst_size),
|
||||
segment.min(dst_size.saturating_sub(segment)),
|
||||
segment.min(dst_size.saturating_sub(segment * 2)),
|
||||
dst_size.saturating_sub(segment * 3),
|
||||
];
|
||||
let table = dtable.as_ptr().add(1) as *const HufDEltX4;
|
||||
let table_log = huf_table_log(dtable[0]);
|
||||
|
||||
for index in 0..4 {
|
||||
let mut stream = DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
};
|
||||
let error = init_dstream(&mut stream, streams[index], lengths[index]);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
let decoded = huf_decode_stream_x4(
|
||||
starts[index],
|
||||
&mut stream,
|
||||
starts[index].add(sizes[index]),
|
||||
table,
|
||||
table_log,
|
||||
);
|
||||
if decoded != sizes[index] {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
}
|
||||
dst_size
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress1x4_using_dtable(
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
dtable: &[u32; 1 + (1 << HUF_MAX_TABLELOG)],
|
||||
) -> usize {
|
||||
let mut stream = DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
};
|
||||
let error = init_dstream(&mut stream, c_src, c_src_size);
|
||||
if ERR_isError(error) {
|
||||
return error;
|
||||
}
|
||||
let table = dtable.as_ptr().add(1) as *const HufDEltX4;
|
||||
let decoded = huf_decode_stream_x4(
|
||||
dst,
|
||||
&mut stream,
|
||||
dst.add(dst_size),
|
||||
table,
|
||||
huf_table_log(dtable[0]),
|
||||
);
|
||||
if decoded != dst_size || !end_of_dstream(&stream) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dst_size
|
||||
}
|
||||
|
||||
/* ******************************************
|
||||
* v0.7 frame decoder
|
||||
********************************************/
|
||||
|
||||
const SKIPPABLE_MAGIC_START: u32 = 0x184d_2a50;
|
||||
const SKIPPABLE_HEADER_SIZE: usize = 8;
|
||||
const STAGE_GET_FRAME_HEADER_SIZE: u32 = 0;
|
||||
const STAGE_DECODE_FRAME_HEADER: u32 = 1;
|
||||
const STAGE_DECODE_BLOCK_HEADER: u32 = 2;
|
||||
const STAGE_DECOMPRESS_BLOCK: u32 = 3;
|
||||
const STAGE_DECODE_SKIPPABLE_HEADER: u32 = 4;
|
||||
const STAGE_SKIP_FRAME: u32 = 5;
|
||||
|
||||
const WINDOWLOG_MAX: u32 = if usize::BITS == 32 { 25 } else { 27 };
|
||||
const FCS_FIELD_SIZE: [usize; 4] = [0, 2, 4, 8];
|
||||
const DID_FIELD_SIZE: [usize; 4] = [0, 1, 2, 4];
|
||||
|
||||
const LL_BASE: [u32; MAX_LL as usize + 1] = [
|
||||
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 22, 24, 28, 32, 40, 48, 64,
|
||||
0x80, 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000, 0x8000, 0x10000,
|
||||
];
|
||||
const ML_BASE: [u32; MAX_ML as usize + 1] = [
|
||||
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
|
||||
28, 29, 30, 31, 32, 33, 34, 35, 37, 39, 41, 43, 47, 51, 59, 67, 83, 99, 0x83, 0x103, 0x203,
|
||||
0x403, 0x803, 0x1003, 0x2003, 0x4003, 0x8003, 0x10003,
|
||||
];
|
||||
const OF_BASE: [u32; MAX_OFF as usize + 1] = [
|
||||
0, 1, 1, 5, 0xd, 0x1d, 0x3d, 0x7d, 0xfd, 0x1fd, 0x3fd, 0x7fd, 0xffd, 0x1ffd, 0x3ffd, 0x7ffd,
|
||||
0xfffd, 0x1fffd, 0x3fffd, 0x7fffd, 0xffffd, 0x1ffffd, 0x3ffffd, 0x7ffffd, 0xfffffd, 0x1fffffd,
|
||||
0x3fffffd, 0x7fffffd, 0xffffffd,
|
||||
];
|
||||
|
||||
type AllocFunction = unsafe extern "C" fn(*mut c_void, usize) -> *mut c_void;
|
||||
type FreeFunction = unsafe extern "C" fn(*mut c_void, *mut c_void);
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
pub struct ZSTDv07_customMem {
|
||||
pub customAlloc: Option<AllocFunction>,
|
||||
pub customFree: Option<FreeFunction>,
|
||||
pub opaque: *mut c_void,
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
pub struct ZSTDv07_frameParams {
|
||||
pub frameContentSize: u64,
|
||||
pub windowSize: u32,
|
||||
pub dictID: u32,
|
||||
pub checksumFlag: u32,
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy)]
|
||||
struct Xxh64State {
|
||||
total_len: u64,
|
||||
v: [u64; 4],
|
||||
mem64: [u64; 4],
|
||||
memsize: u32,
|
||||
reserved32: u32,
|
||||
reserved64: u64,
|
||||
}
|
||||
|
||||
const XXH_PRIME64_1: u64 = 0x9e37_79b1_85eb_ca87;
|
||||
const XXH_PRIME64_2: u64 = 0xc2b2_ae3d_27d4_eb4f;
|
||||
const XXH_PRIME64_3: u64 = 0x1656_67b1_9e37_79f9;
|
||||
const XXH_PRIME64_4: u64 = 0x85eb_ca77_c2b2_ae63;
|
||||
const XXH_PRIME64_5: u64 = 0x27d4_eb2f_1656_67c5;
|
||||
|
||||
#[inline]
|
||||
fn xxh_round(mut acc: u64, input: u64) -> u64 {
|
||||
acc = acc.wrapping_add(input.wrapping_mul(XXH_PRIME64_2));
|
||||
acc = acc.rotate_left(31);
|
||||
acc.wrapping_mul(XXH_PRIME64_1)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn xxh_merge_round(mut acc: u64, value: u64) -> u64 {
|
||||
acc ^= xxh_round(0, value);
|
||||
acc.wrapping_mul(XXH_PRIME64_1).wrapping_add(XXH_PRIME64_4)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn xxh_avalanche(mut hash: u64) -> u64 {
|
||||
hash ^= hash >> 33;
|
||||
hash = hash.wrapping_mul(XXH_PRIME64_2);
|
||||
hash ^= hash >> 29;
|
||||
hash = hash.wrapping_mul(XXH_PRIME64_3);
|
||||
hash ^ (hash >> 32)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_read_le32(src: *const u8) -> u32 {
|
||||
u32::from_le_bytes(ptr::read_unaligned(src.cast::<[u8; 4]>()))
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_read_le64(src: *const u8) -> u64 {
|
||||
u64::from_le_bytes(ptr::read_unaligned(src.cast::<[u8; 8]>()))
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_process_stripe(v: &mut [u64; 4], src: *const u8) {
|
||||
v[0] = xxh_round(v[0], xxh_read_le64(src));
|
||||
v[1] = xxh_round(v[1], xxh_read_le64(src.add(8)));
|
||||
v[2] = xxh_round(v[2], xxh_read_le64(src.add(16)));
|
||||
v[3] = xxh_round(v[3], xxh_read_le64(src.add(24)));
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_finalize(mut hash: u64, mut src: *const u8, mut size: usize) -> u64 {
|
||||
while size >= 8 {
|
||||
hash ^= xxh_round(0, xxh_read_le64(src));
|
||||
hash = hash
|
||||
.rotate_left(27)
|
||||
.wrapping_mul(XXH_PRIME64_1)
|
||||
.wrapping_add(XXH_PRIME64_4);
|
||||
src = src.add(8);
|
||||
size -= 8;
|
||||
}
|
||||
if size >= 4 {
|
||||
hash ^= (xxh_read_le32(src) as u64).wrapping_mul(XXH_PRIME64_1);
|
||||
hash = hash
|
||||
.rotate_left(23)
|
||||
.wrapping_mul(XXH_PRIME64_2)
|
||||
.wrapping_add(XXH_PRIME64_3);
|
||||
src = src.add(4);
|
||||
size -= 4;
|
||||
}
|
||||
while size != 0 {
|
||||
hash ^= (*src as u64).wrapping_mul(XXH_PRIME64_5);
|
||||
hash = hash.rotate_left(11).wrapping_mul(XXH_PRIME64_1);
|
||||
src = src.add(1);
|
||||
size -= 1;
|
||||
}
|
||||
xxh_avalanche(hash)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_reset(state: &mut Xxh64State, seed: u64) {
|
||||
*state = Xxh64State {
|
||||
total_len: 0,
|
||||
v: [
|
||||
seed.wrapping_add(XXH_PRIME64_1).wrapping_add(XXH_PRIME64_2),
|
||||
seed.wrapping_add(XXH_PRIME64_2),
|
||||
seed,
|
||||
seed.wrapping_sub(XXH_PRIME64_1),
|
||||
],
|
||||
mem64: [0; 4],
|
||||
memsize: 0,
|
||||
reserved32: 0,
|
||||
reserved64: 0,
|
||||
};
|
||||
}
|
||||
|
||||
unsafe fn xxh_update(state: &mut Xxh64State, src: *const u8, size: usize) {
|
||||
if size == 0 {
|
||||
return;
|
||||
}
|
||||
state.total_len = state.total_len.wrapping_add(size as u64);
|
||||
let buffered = state.memsize as usize;
|
||||
if buffered + size < 32 {
|
||||
ptr::copy_nonoverlapping(
|
||||
src,
|
||||
state.mem64.as_mut_ptr().cast::<u8>().add(buffered),
|
||||
size,
|
||||
);
|
||||
state.memsize += size as u32;
|
||||
return;
|
||||
}
|
||||
|
||||
let mut offset = 0;
|
||||
if buffered != 0 {
|
||||
let fill = 32 - buffered;
|
||||
ptr::copy_nonoverlapping(
|
||||
src,
|
||||
state.mem64.as_mut_ptr().cast::<u8>().add(buffered),
|
||||
fill,
|
||||
);
|
||||
xxh_process_stripe(&mut state.v, state.mem64.as_ptr().cast());
|
||||
offset = fill;
|
||||
state.memsize = 0;
|
||||
}
|
||||
while offset + 32 <= size {
|
||||
xxh_process_stripe(&mut state.v, src.add(offset));
|
||||
offset += 32;
|
||||
}
|
||||
let remaining = size - offset;
|
||||
if remaining != 0 {
|
||||
ptr::copy_nonoverlapping(
|
||||
src.add(offset),
|
||||
state.mem64.as_mut_ptr().cast::<u8>(),
|
||||
remaining,
|
||||
);
|
||||
state.memsize = remaining as u32;
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn xxh_digest(state: &Xxh64State) -> u64 {
|
||||
let mut hash = if state.total_len >= 32 {
|
||||
let mut hash = state.v[0]
|
||||
.rotate_left(1)
|
||||
.wrapping_add(state.v[1].rotate_left(7))
|
||||
.wrapping_add(state.v[2].rotate_left(12))
|
||||
.wrapping_add(state.v[3].rotate_left(18));
|
||||
for value in state.v {
|
||||
hash = xxh_merge_round(hash, value);
|
||||
}
|
||||
hash
|
||||
} else {
|
||||
state.v[2].wrapping_add(XXH_PRIME64_5)
|
||||
};
|
||||
hash = hash.wrapping_add(state.total_len);
|
||||
xxh_finalize(hash, state.mem64.as_ptr().cast(), state.memsize as usize)
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
union HufDTable {
|
||||
x2: HufTableX2,
|
||||
x4: [u32; HUF_TABLE_SIZE_U32],
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
pub struct ZSTDv07_DCtx {
|
||||
ll_table: [u32; 1 + (1 << LL_FSE_LOG)],
|
||||
off_table: [u32; 1 + (1 << OFF_FSE_LOG)],
|
||||
ml_table: [u32; 1 + (1 << ML_FSE_LOG)],
|
||||
huf_table: HufDTable,
|
||||
previous_dst_end: *const u8,
|
||||
base: *const u8,
|
||||
v_base: *const u8,
|
||||
dict_end: *const u8,
|
||||
expected: usize,
|
||||
rep: [u32; REPCODE_NUM],
|
||||
f_params: ZSTDv07_frameParams,
|
||||
b_type: u32,
|
||||
stage: u32,
|
||||
lit_entropy: u32,
|
||||
fse_entropy: u32,
|
||||
xxh_state: Xxh64State,
|
||||
header_size: usize,
|
||||
dict_id: u32,
|
||||
lit_ptr: *const u8,
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
lit_size: usize,
|
||||
lit_buffer: [u8; BLOCKSIZE + WILDCOPY_OVERLENGTH],
|
||||
header_buffer: [u8; FRAME_HEADER_SIZE_MAX],
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe extern "C" fn default_alloc(_: *mut c_void, size: usize) -> *mut c_void {
|
||||
libc::malloc(size)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe extern "C" fn default_free(_: *mut c_void, address: *mut c_void) {
|
||||
libc::free(address)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn default_custom_mem() -> ZSTDv07_customMem {
|
||||
ZSTDv07_customMem {
|
||||
customAlloc: Some(default_alloc),
|
||||
customFree: Some(default_free),
|
||||
opaque: ptr::null_mut(),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn normalized_custom_mem(mut custom_mem: ZSTDv07_customMem) -> Option<ZSTDv07_customMem> {
|
||||
if custom_mem.customAlloc.is_none() && custom_mem.customFree.is_none() {
|
||||
custom_mem = default_custom_mem();
|
||||
}
|
||||
if custom_mem.customAlloc.is_none() || custom_mem.customFree.is_none() {
|
||||
None
|
||||
} else {
|
||||
Some(custom_mem)
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn frame_header_size(src: *const u8, src_size: usize) -> usize {
|
||||
if src_size < FRAME_HEADER_SIZE_MIN {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let fhd = *src.add(4);
|
||||
let dict_id = (fhd & 3) as usize;
|
||||
let direct_mode = ((fhd >> 5) & 1) as usize;
|
||||
let fcs_id = (fhd >> 6) as usize;
|
||||
FRAME_HEADER_SIZE_MIN
|
||||
+ (direct_mode == 0) as usize
|
||||
+ DID_FIELD_SIZE[dict_id]
|
||||
+ FCS_FIELD_SIZE[fcs_id]
|
||||
+ (direct_mode != 0 && FCS_FIELD_SIZE[fcs_id] == 0) as usize
|
||||
}
|
||||
|
||||
unsafe fn get_frame_params_impl(
|
||||
f_params: &mut ZSTDv07_frameParams,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size < FRAME_HEADER_SIZE_MIN {
|
||||
return FRAME_HEADER_SIZE_MIN;
|
||||
}
|
||||
*f_params = ZSTDv07_frameParams {
|
||||
frameContentSize: 0,
|
||||
windowSize: 0,
|
||||
dictID: 0,
|
||||
checksumFlag: 0,
|
||||
};
|
||||
if read_le32(src) != ZSTD_MAGIC_NUMBER {
|
||||
if (read_le32(src) & 0xffff_fff0) == SKIPPABLE_MAGIC_START {
|
||||
if src_size < SKIPPABLE_HEADER_SIZE {
|
||||
return SKIPPABLE_HEADER_SIZE;
|
||||
}
|
||||
f_params.frameContentSize = read_le32(src.add(4)) as u64;
|
||||
return 0;
|
||||
}
|
||||
return ERROR(ZstdErrorCode::PrefixUnknown);
|
||||
}
|
||||
|
||||
let header_size = frame_header_size(src, src_size);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if src_size < header_size {
|
||||
return header_size;
|
||||
}
|
||||
|
||||
let fhd = *src.add(4);
|
||||
let mut pos = 5usize;
|
||||
let dict_id_size_code = (fhd & 3) as usize;
|
||||
let checksum_flag = ((fhd >> 2) & 1) as u32;
|
||||
let direct_mode = ((fhd >> 5) & 1) != 0;
|
||||
let fcs_id = (fhd >> 6) as usize;
|
||||
let mut window_size = 0u32;
|
||||
let mut dict_id = 0u32;
|
||||
let mut frame_content_size = 0u64;
|
||||
|
||||
if fhd & 0x08 != 0 {
|
||||
return ERROR(ZstdErrorCode::FrameParameterUnsupported);
|
||||
}
|
||||
if !direct_mode {
|
||||
let wl = *src.add(pos);
|
||||
pos += 1;
|
||||
let window_log = (wl >> 3) as u32 + ZSTD_WINDOWLOG_ABSOLUTE_MIN;
|
||||
if window_log > WINDOWLOG_MAX {
|
||||
return ERROR(ZstdErrorCode::FrameParameterUnsupported);
|
||||
}
|
||||
window_size = 1u32 << window_log;
|
||||
window_size += (window_size >> 3) * u32::from(wl & 7);
|
||||
}
|
||||
match dict_id_size_code {
|
||||
0 => {}
|
||||
1 => {
|
||||
dict_id = *src.add(pos) as u32;
|
||||
pos += 1;
|
||||
}
|
||||
2 => {
|
||||
dict_id = read_le16(src.add(pos)) as u32;
|
||||
pos += 2;
|
||||
}
|
||||
3 => {
|
||||
dict_id = read_le32(src.add(pos));
|
||||
pos += 4;
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
match fcs_id {
|
||||
0 => {
|
||||
if direct_mode {
|
||||
frame_content_size = *src.add(pos) as u64;
|
||||
}
|
||||
}
|
||||
1 => frame_content_size = read_le16(src.add(pos)) as u64 + 256,
|
||||
2 => frame_content_size = read_le32(src.add(pos)) as u64,
|
||||
3 => frame_content_size = read_le64(src.add(pos)),
|
||||
_ => unreachable!(),
|
||||
}
|
||||
if window_size == 0 {
|
||||
window_size = frame_content_size as u32;
|
||||
}
|
||||
if window_size as u64 > (1u64 << WINDOWLOG_MAX) {
|
||||
return ERROR(ZstdErrorCode::FrameParameterUnsupported);
|
||||
}
|
||||
f_params.frameContentSize = frame_content_size;
|
||||
f_params.windowSize = window_size;
|
||||
f_params.dictID = dict_id;
|
||||
f_params.checksumFlag = checksum_flag;
|
||||
0
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
struct BlockProperties {
|
||||
block_type: u32,
|
||||
orig_size: u32,
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn get_block_size(
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
properties: &mut BlockProperties,
|
||||
) -> usize {
|
||||
if src_size < BLOCK_HEADER_SIZE {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let flags = *src;
|
||||
let c_size =
|
||||
*src.add(2) as usize | ((*src.add(1) as usize) << 8) | (((flags as usize) & 7) << 16);
|
||||
properties.block_type = (flags >> 6) as u32;
|
||||
properties.orig_size = if properties.block_type == BT_RLE {
|
||||
c_size as u32
|
||||
} else {
|
||||
0
|
||||
};
|
||||
if properties.block_type == BT_END {
|
||||
0
|
||||
} else if properties.block_type == BT_RLE {
|
||||
1
|
||||
} else {
|
||||
c_size
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn copy_raw_block(
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size > dst_capacity {
|
||||
return ERROR(ZstdErrorCode::DstSizeTooSmall);
|
||||
}
|
||||
if src_size != 0 {
|
||||
ptr::copy(src, dst, src_size);
|
||||
}
|
||||
src_size
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn generate_n_bytes(dst: *mut u8, dst_capacity: usize, byte: u8, length: usize) -> usize {
|
||||
if length > dst_capacity {
|
||||
return ERROR(ZstdErrorCode::DstSizeTooSmall);
|
||||
}
|
||||
if length != 0 {
|
||||
ptr::write_bytes(dst, byte, length);
|
||||
}
|
||||
length
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn huf_select_decoder(dst_size: usize, c_src_size: usize) -> bool {
|
||||
const ALGO_TIME: [[[u32; 2]; 3]; 16] = [
|
||||
[[0, 0], [1, 1], [2, 2]],
|
||||
[[0, 0], [1, 1], [2, 2]],
|
||||
[[38, 130], [1313, 74], [2151, 38]],
|
||||
[[448, 128], [1353, 74], [2238, 41]],
|
||||
[[556, 128], [1353, 74], [2238, 47]],
|
||||
[[714, 128], [1418, 74], [2436, 53]],
|
||||
[[883, 128], [1437, 74], [2464, 61]],
|
||||
[[897, 128], [1515, 75], [2622, 68]],
|
||||
[[926, 128], [1613, 75], [2730, 75]],
|
||||
[[947, 128], [1729, 77], [3359, 77]],
|
||||
[[1107, 128], [2083, 81], [4006, 84]],
|
||||
[[1177, 128], [2379, 87], [4785, 88]],
|
||||
[[1242, 128], [2415, 93], [5155, 84]],
|
||||
[[1349, 128], [2644, 106], [5260, 106]],
|
||||
[[1455, 128], [2422, 124], [4174, 124]],
|
||||
[[722, 128], [1891, 145], [1936, 146]],
|
||||
];
|
||||
let q = c_src_size * 16 / dst_size;
|
||||
let d256 = (dst_size >> 8) as u32;
|
||||
let mut dtime = [0u32; 3];
|
||||
for index in 0..3 {
|
||||
dtime[index] =
|
||||
ALGO_TIME[q][index][0].wrapping_add(ALGO_TIME[q][index][1].wrapping_mul(d256));
|
||||
}
|
||||
dtime[1] = dtime[1].wrapping_add(dtime[1] >> 3);
|
||||
dtime[1] < dtime[0]
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress1x2_dctx(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
) -> usize {
|
||||
let table = &mut dctx.huf_table.x2;
|
||||
let header_size = huf_read_dtable_x2(table, c_src, c_src_size);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if header_size >= c_src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
huf_decompress1x2_using_dtable(
|
||||
dst,
|
||||
dst_size,
|
||||
c_src.add(header_size),
|
||||
c_src_size - header_size,
|
||||
table,
|
||||
)
|
||||
}
|
||||
|
||||
unsafe fn huf_decompress4_huf_only(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_size: usize,
|
||||
c_src: *const u8,
|
||||
c_src_size: usize,
|
||||
) -> usize {
|
||||
if dst_size == 0 || c_src_size >= dst_size || c_src_size <= 1 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
if huf_select_decoder(dst_size, c_src_size) {
|
||||
let table = &mut dctx.huf_table.x4;
|
||||
let header_size = huf_read_dtable_x4(table, c_src, c_src_size);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if header_size >= c_src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
huf_decompress4x4_using_dtable(
|
||||
dst,
|
||||
dst_size,
|
||||
c_src.add(header_size),
|
||||
c_src_size - header_size,
|
||||
table,
|
||||
)
|
||||
} else {
|
||||
let table = &mut dctx.huf_table.x2;
|
||||
let header_size = huf_read_dtable_x2(table, c_src, c_src_size);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if header_size >= c_src_size {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
huf_decompress4x2_using_dtable(
|
||||
dst,
|
||||
dst_size,
|
||||
c_src.add(header_size),
|
||||
c_src_size - header_size,
|
||||
table,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn decode_literals_block(dctx: &mut ZSTDv07_DCtx, src: *const u8, src_size: usize) -> usize {
|
||||
if src_size < MIN_CBLOCK_SIZE {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
match *src >> 6 {
|
||||
IS_HUF => {
|
||||
let mut lh_size = ((*src >> 4) & 3) as usize;
|
||||
let literal_size;
|
||||
let compressed_size;
|
||||
let single_stream;
|
||||
if src_size < 5 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
match lh_size {
|
||||
0 | 1 => {
|
||||
lh_size = 3;
|
||||
single_stream = *src & 16 != 0;
|
||||
literal_size = (((*src & 15) as usize) << 6) + ((*src.add(1) as usize) >> 2);
|
||||
compressed_size = ((*src.add(1) as usize & 3) << 8) + *src.add(2) as usize;
|
||||
}
|
||||
2 => {
|
||||
lh_size = 4;
|
||||
single_stream = false;
|
||||
literal_size = (((*src & 15) as usize) << 10)
|
||||
+ ((*src.add(1) as usize) << 2)
|
||||
+ ((*src.add(2) as usize) >> 6);
|
||||
compressed_size = ((*src.add(2) as usize & 63) << 8) + *src.add(3) as usize;
|
||||
}
|
||||
3 => {
|
||||
lh_size = 5;
|
||||
single_stream = false;
|
||||
literal_size = (((*src & 15) as usize) << 14)
|
||||
+ ((*src.add(1) as usize) << 6)
|
||||
+ ((*src.add(2) as usize) >> 2);
|
||||
compressed_size = ((*src.add(2) as usize & 3) << 16)
|
||||
+ ((*src.add(3) as usize) << 8)
|
||||
+ *src.add(4) as usize;
|
||||
}
|
||||
_ => unreachable!(),
|
||||
}
|
||||
if literal_size > BLOCKSIZE || compressed_size + lh_size > src_size {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let compressed = src.add(lh_size);
|
||||
let literal_buffer = dctx.lit_buffer.as_mut_ptr();
|
||||
let decoded = if single_stream {
|
||||
huf_decompress1x2_dctx(
|
||||
dctx,
|
||||
literal_buffer,
|
||||
literal_size,
|
||||
compressed,
|
||||
compressed_size,
|
||||
)
|
||||
} else {
|
||||
huf_decompress4_huf_only(
|
||||
dctx,
|
||||
literal_buffer,
|
||||
literal_size,
|
||||
compressed,
|
||||
compressed_size,
|
||||
)
|
||||
};
|
||||
if ERR_isError(decoded) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dctx.lit_ptr = dctx.lit_buffer.as_ptr();
|
||||
dctx.lit_size = literal_size;
|
||||
dctx.lit_entropy = 1;
|
||||
dctx.lit_buffer[literal_size..literal_size + WILDCOPY_OVERLENGTH].fill(0);
|
||||
compressed_size + lh_size
|
||||
}
|
||||
IS_PCH => {
|
||||
let mut lh_size = ((*src >> 4) & 3) as usize;
|
||||
if lh_size != 1 || dctx.lit_entropy == 0 {
|
||||
return if lh_size != 1 {
|
||||
ERROR(ZstdErrorCode::CorruptionDetected)
|
||||
} else {
|
||||
ERROR(ZstdErrorCode::DictionaryCorrupted)
|
||||
};
|
||||
}
|
||||
lh_size = 3;
|
||||
let literal_size = (((*src & 15) as usize) << 6) + ((*src.add(1) as usize) >> 2);
|
||||
let compressed_size = ((*src.add(1) as usize & 3) << 8) + *src.add(2) as usize;
|
||||
if compressed_size + lh_size > src_size {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let table = &dctx.huf_table.x4;
|
||||
let decoded = huf_decompress1x4_using_dtable(
|
||||
dctx.lit_buffer.as_mut_ptr(),
|
||||
literal_size,
|
||||
src.add(lh_size),
|
||||
compressed_size,
|
||||
table,
|
||||
);
|
||||
if ERR_isError(decoded) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dctx.lit_ptr = dctx.lit_buffer.as_ptr();
|
||||
dctx.lit_size = literal_size;
|
||||
dctx.lit_buffer[literal_size..literal_size + WILDCOPY_OVERLENGTH].fill(0);
|
||||
compressed_size + lh_size
|
||||
}
|
||||
IS_RAW => {
|
||||
let mut lh_size = ((*src >> 4) & 3) as usize;
|
||||
let literal_size = match lh_size {
|
||||
0 | 1 => {
|
||||
lh_size = 1;
|
||||
(*src & 31) as usize
|
||||
}
|
||||
2 => (((*src & 15) as usize) << 8) + *src.add(1) as usize,
|
||||
3 => {
|
||||
(((*src & 15) as usize) << 16)
|
||||
+ ((*src.add(1) as usize) << 8)
|
||||
+ *src.add(2) as usize
|
||||
}
|
||||
_ => unreachable!(),
|
||||
};
|
||||
if lh_size + literal_size + WILDCOPY_OVERLENGTH > src_size {
|
||||
if lh_size + literal_size > src_size {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
ptr::copy(src.add(lh_size), dctx.lit_buffer.as_mut_ptr(), literal_size);
|
||||
dctx.lit_ptr = dctx.lit_buffer.as_ptr();
|
||||
dctx.lit_size = literal_size;
|
||||
dctx.lit_buffer[literal_size..literal_size + WILDCOPY_OVERLENGTH].fill(0);
|
||||
lh_size + literal_size
|
||||
} else {
|
||||
dctx.lit_ptr = src.add(lh_size);
|
||||
dctx.lit_size = literal_size;
|
||||
lh_size + literal_size
|
||||
}
|
||||
}
|
||||
IS_RLE => {
|
||||
let mut lh_size = ((*src >> 4) & 3) as usize;
|
||||
let literal_size = match lh_size {
|
||||
0 | 1 => {
|
||||
lh_size = 1;
|
||||
(*src & 31) as usize
|
||||
}
|
||||
2 => (((*src & 15) as usize) << 8) + *src.add(1) as usize,
|
||||
3 => {
|
||||
if src_size < 4 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
(((*src & 15) as usize) << 16)
|
||||
+ ((*src.add(1) as usize) << 8)
|
||||
+ *src.add(2) as usize
|
||||
}
|
||||
_ => unreachable!(),
|
||||
};
|
||||
if literal_size > BLOCKSIZE {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dctx.lit_buffer[..literal_size + WILDCOPY_OVERLENGTH].fill(*src.add(lh_size));
|
||||
dctx.lit_ptr = dctx.lit_buffer.as_ptr();
|
||||
dctx.lit_size = literal_size;
|
||||
lh_size + 1
|
||||
}
|
||||
_ => ERROR(ZstdErrorCode::CorruptionDetected),
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
unsafe fn build_seq_table(
|
||||
table: &mut [u32],
|
||||
encoding: u32,
|
||||
max_symbol: u32,
|
||||
max_log: u32,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
default_norm: &[i16],
|
||||
default_log: u32,
|
||||
repeat_table: bool,
|
||||
) -> usize {
|
||||
match encoding {
|
||||
FSE_ENCODING_RLE => {
|
||||
if src_size == 0 {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
if *src > max_symbol as u8 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
fse_build_dtable_rle(table, *src);
|
||||
1
|
||||
}
|
||||
FSE_ENCODING_RAW => {
|
||||
let result = fse_build_dtable(table, default_norm, max_symbol, default_log);
|
||||
if ERR_isError(result) {
|
||||
ERROR(ZstdErrorCode::CorruptionDetected)
|
||||
} else {
|
||||
0
|
||||
}
|
||||
}
|
||||
FSE_ENCODING_STATIC => {
|
||||
if repeat_table {
|
||||
0
|
||||
} else {
|
||||
ERROR(ZstdErrorCode::CorruptionDetected)
|
||||
}
|
||||
}
|
||||
FSE_ENCODING_DYNAMIC => {
|
||||
let mut norm = [0i16; 256];
|
||||
let mut max_value = max_symbol;
|
||||
let mut table_log = 0;
|
||||
let header_size =
|
||||
fse_read_ncount(&mut norm, &mut max_value, &mut table_log, src, src_size);
|
||||
if ERR_isError(header_size) || table_log > max_log {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let result = fse_build_dtable(table, &norm, max_value, table_log);
|
||||
if ERR_isError(result) {
|
||||
ERROR(ZstdErrorCode::CorruptionDetected)
|
||||
} else {
|
||||
header_size
|
||||
}
|
||||
}
|
||||
_ => ERROR(ZstdErrorCode::CorruptionDetected),
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn decode_seq_headers(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
nb_sequences: &mut i32,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size < MIN_SEQUENCES_SIZE {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let start = src as usize;
|
||||
let end = start.wrapping_add(src_size);
|
||||
let mut ip = src;
|
||||
let mut nb_seq = *ip as i32;
|
||||
ip = ip.add(1);
|
||||
if nb_seq == 0 {
|
||||
*nb_sequences = 0;
|
||||
return 1;
|
||||
}
|
||||
if nb_seq > 0x7f {
|
||||
if nb_seq == 0xff {
|
||||
if (ip as usize) > end.wrapping_sub(2) {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
nb_seq = read_le16(ip) as i32 + LONG_NB_SEQ;
|
||||
ip = ip.add(2);
|
||||
} else {
|
||||
if (ip as usize) >= end {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
nb_seq = ((nb_seq - 0x80) << 8) + *ip as i32;
|
||||
ip = ip.add(1);
|
||||
}
|
||||
}
|
||||
*nb_sequences = nb_seq;
|
||||
|
||||
if (ip as usize) > end.wrapping_sub(4) {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let descriptor = *ip;
|
||||
let ll_type = (descriptor >> 6) as u32;
|
||||
let off_type = ((descriptor >> 4) & 3) as u32;
|
||||
let ml_type = ((descriptor >> 2) & 3) as u32;
|
||||
ip = ip.add(1);
|
||||
let repeat_table = dctx.fse_entropy != 0;
|
||||
|
||||
let ll_size = build_seq_table(
|
||||
&mut dctx.ll_table,
|
||||
ll_type,
|
||||
MAX_LL,
|
||||
LL_FSE_LOG,
|
||||
ip,
|
||||
end.wrapping_sub(ip as usize),
|
||||
&LL_DEFAULT_NORM,
|
||||
LL_DEFAULT_LOG,
|
||||
repeat_table,
|
||||
);
|
||||
if ERR_isError(ll_size) {
|
||||
return ll_size;
|
||||
}
|
||||
ip = ip.add(ll_size);
|
||||
let off_size = build_seq_table(
|
||||
&mut dctx.off_table,
|
||||
off_type,
|
||||
MAX_OFF,
|
||||
OFF_FSE_LOG,
|
||||
ip,
|
||||
end.wrapping_sub(ip as usize),
|
||||
&OF_DEFAULT_NORM,
|
||||
OF_DEFAULT_LOG,
|
||||
repeat_table,
|
||||
);
|
||||
if ERR_isError(off_size) {
|
||||
return off_size;
|
||||
}
|
||||
ip = ip.add(off_size);
|
||||
let ml_size = build_seq_table(
|
||||
&mut dctx.ml_table,
|
||||
ml_type,
|
||||
MAX_ML,
|
||||
ML_FSE_LOG,
|
||||
ip,
|
||||
end.wrapping_sub(ip as usize),
|
||||
&ML_DEFAULT_NORM,
|
||||
ML_DEFAULT_LOG,
|
||||
repeat_table,
|
||||
);
|
||||
if ERR_isError(ml_size) {
|
||||
return ml_size;
|
||||
}
|
||||
ip = ip.add(ml_size);
|
||||
(ip as usize).wrapping_sub(start)
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy)]
|
||||
struct Sequence {
|
||||
lit_length: usize,
|
||||
match_length: usize,
|
||||
offset: usize,
|
||||
}
|
||||
|
||||
struct SequenceState {
|
||||
stream: DStream,
|
||||
state_ll: FseDState,
|
||||
state_off: FseDState,
|
||||
state_ml: FseDState,
|
||||
prev_offset: [usize; REPCODE_NUM],
|
||||
}
|
||||
|
||||
unsafe fn decode_sequence(state: &mut SequenceState) -> Sequence {
|
||||
let ll_code = fse_peek_symbol(&state.state_ll) as usize;
|
||||
let ml_code = fse_peek_symbol(&state.state_ml) as usize;
|
||||
let of_code = fse_peek_symbol(&state.state_off) as usize;
|
||||
let ll_bits = LL_BITS_TABLE[ll_code];
|
||||
let ml_bits = ML_BITS_TABLE[ml_code];
|
||||
let of_bits = of_code as u32;
|
||||
let total_bits = ll_bits + ml_bits + of_bits;
|
||||
|
||||
let mut offset = if of_code == 0 {
|
||||
0
|
||||
} else {
|
||||
OF_BASE[of_code] as usize + read_bits(&mut state.stream, of_bits)
|
||||
};
|
||||
if USIZE_BITS == 32 {
|
||||
reload_dstream(&mut state.stream);
|
||||
}
|
||||
if of_code <= 1 {
|
||||
if ll_code == 0 && offset <= 1 {
|
||||
offset = 1 - offset;
|
||||
}
|
||||
if offset != 0 {
|
||||
let temp = state.prev_offset[offset];
|
||||
if offset != 1 {
|
||||
state.prev_offset[2] = state.prev_offset[1];
|
||||
}
|
||||
state.prev_offset[1] = state.prev_offset[0];
|
||||
state.prev_offset[0] = temp;
|
||||
offset = temp;
|
||||
} else {
|
||||
offset = state.prev_offset[0];
|
||||
}
|
||||
} else {
|
||||
state.prev_offset[2] = state.prev_offset[1];
|
||||
state.prev_offset[1] = state.prev_offset[0];
|
||||
state.prev_offset[0] = offset;
|
||||
}
|
||||
|
||||
let match_length = ML_BASE[ml_code] as usize
|
||||
+ if ml_code > 31 {
|
||||
read_bits(&mut state.stream, ml_bits)
|
||||
} else {
|
||||
0
|
||||
};
|
||||
if USIZE_BITS == 32 && ml_bits + ll_bits > 24 {
|
||||
reload_dstream(&mut state.stream);
|
||||
}
|
||||
let lit_length = LL_BASE[ll_code] as usize
|
||||
+ if ll_code > 15 {
|
||||
read_bits(&mut state.stream, ll_bits)
|
||||
} else {
|
||||
0
|
||||
};
|
||||
if USIZE_BITS == 32 || total_bits > 64 - 7 - (LL_FSE_LOG + ML_FSE_LOG + OFF_FSE_LOG) {
|
||||
reload_dstream(&mut state.stream);
|
||||
}
|
||||
fse_update_state(&mut state.state_ll, &mut state.stream);
|
||||
fse_update_state(&mut state.state_ml, &mut state.stream);
|
||||
if USIZE_BITS == 32 {
|
||||
reload_dstream(&mut state.stream);
|
||||
}
|
||||
fse_update_state(&mut state.state_off, &mut state.stream);
|
||||
|
||||
Sequence {
|
||||
lit_length,
|
||||
match_length,
|
||||
offset,
|
||||
}
|
||||
}
|
||||
|
||||
#[allow(clippy::too_many_arguments)]
|
||||
unsafe fn exec_sequence(
|
||||
mut op: *mut u8,
|
||||
oend: *mut u8,
|
||||
mut sequence: Sequence,
|
||||
lit_ptr: &mut *const u8,
|
||||
lit_limit: *const u8,
|
||||
base: *const u8,
|
||||
v_base: *const u8,
|
||||
dict_end: *const u8,
|
||||
) -> usize {
|
||||
let op_addr = op as usize;
|
||||
let oend_addr = oend as usize;
|
||||
let o_lit_end = op_addr.wrapping_add(sequence.lit_length);
|
||||
let sequence_length = sequence.lit_length.wrapping_add(sequence.match_length);
|
||||
let o_match_end = op_addr.wrapping_add(sequence_length);
|
||||
let oend_w = oend_addr.wrapping_sub(WILDCOPY_OVERLENGTH);
|
||||
let lit_end = (*lit_ptr as usize).wrapping_add(sequence.lit_length);
|
||||
let mut match_addr = o_lit_end.wrapping_sub(sequence.offset);
|
||||
|
||||
if sequence.lit_length + WILDCOPY_OVERLENGTH > oend_addr.wrapping_sub(op_addr)
|
||||
|| sequence_length > oend_addr.wrapping_sub(op_addr)
|
||||
{
|
||||
return ERROR(ZstdErrorCode::DstSizeTooSmall);
|
||||
}
|
||||
if sequence.lit_length > (lit_limit as usize).wrapping_sub(*lit_ptr as usize) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
|
||||
zstd_wildcopy(op, *lit_ptr, sequence.lit_length as isize);
|
||||
op = o_lit_end as *mut u8;
|
||||
*lit_ptr = lit_end as *const u8;
|
||||
|
||||
if sequence.offset > o_lit_end.wrapping_sub(base as usize) {
|
||||
if sequence.offset > o_lit_end.wrapping_sub(v_base as usize) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
match_addr = (dict_end as usize).wrapping_sub((base as usize).wrapping_sub(match_addr));
|
||||
if match_addr.wrapping_add(sequence.match_length) <= dict_end as usize {
|
||||
ptr::copy(
|
||||
match_addr as *const u8,
|
||||
o_lit_end as *mut u8,
|
||||
sequence.match_length,
|
||||
);
|
||||
return sequence_length;
|
||||
}
|
||||
let length1 = (dict_end as usize).wrapping_sub(match_addr);
|
||||
ptr::copy(match_addr as *const u8, o_lit_end as *mut u8, length1);
|
||||
op = o_lit_end.wrapping_add(length1) as *mut u8;
|
||||
sequence.match_length = sequence.match_length.wrapping_sub(length1);
|
||||
match_addr = base as usize;
|
||||
if op as usize > oend_w || sequence.match_length < MINMATCH {
|
||||
let mut out = op;
|
||||
let mut m = match_addr as *const u8;
|
||||
while (out as usize) < o_match_end {
|
||||
*out = *m;
|
||||
out = out.add(1);
|
||||
m = m.add(1);
|
||||
}
|
||||
return sequence_length;
|
||||
}
|
||||
}
|
||||
|
||||
if sequence.offset < 8 {
|
||||
const DEC32: [usize; 8] = [0, 1, 2, 1, 4, 4, 4, 4];
|
||||
const DEC64: [usize; 8] = [8, 8, 8, 7, 8, 9, 10, 11];
|
||||
*op = *(match_addr as *const u8);
|
||||
*op.add(1) = *(match_addr as *const u8).add(1);
|
||||
*op.add(2) = *(match_addr as *const u8).add(2);
|
||||
*op.add(3) = *(match_addr as *const u8).add(3);
|
||||
zstd_copy4(
|
||||
op.add(4),
|
||||
(match_addr + DEC32[sequence.offset]) as *const u8,
|
||||
);
|
||||
match_addr = match_addr
|
||||
.wrapping_add(8)
|
||||
.wrapping_sub(DEC64[sequence.offset]);
|
||||
} else {
|
||||
zstd_copy8(op, match_addr as *const u8);
|
||||
}
|
||||
op = op.add(8);
|
||||
match_addr = match_addr.wrapping_add(8);
|
||||
|
||||
if o_match_end > oend_addr.wrapping_sub(16 - MINMATCH) {
|
||||
if (op as usize) < oend_w {
|
||||
let distance = oend_w - op as usize;
|
||||
zstd_wildcopy(op, match_addr as *const u8, distance as isize);
|
||||
match_addr = match_addr.wrapping_add(distance);
|
||||
op = oend_w as *mut u8;
|
||||
}
|
||||
while (op as usize) < o_match_end {
|
||||
*op = *(match_addr as *const u8);
|
||||
op = op.add(1);
|
||||
match_addr = match_addr.wrapping_add(1);
|
||||
}
|
||||
} else {
|
||||
zstd_wildcopy(
|
||||
op,
|
||||
match_addr as *const u8,
|
||||
sequence.match_length as isize - 8,
|
||||
);
|
||||
}
|
||||
sequence_length
|
||||
}
|
||||
|
||||
unsafe fn decompress_sequences(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
seq_start: *const u8,
|
||||
seq_size: usize,
|
||||
) -> usize {
|
||||
let start = seq_start as usize;
|
||||
let end = start.wrapping_add(seq_size);
|
||||
let ostart = dst;
|
||||
let oend = (dst as usize).wrapping_add(dst_capacity) as *mut u8;
|
||||
let mut op = dst;
|
||||
let mut lit_ptr = dctx.lit_ptr;
|
||||
let lit_end = dctx.lit_ptr.add(dctx.lit_size);
|
||||
let mut nb_seq = 0i32;
|
||||
let header_size = decode_seq_headers(dctx, &mut nb_seq, seq_start, seq_size);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
let ip = seq_start.add(header_size);
|
||||
|
||||
if nb_seq != 0 {
|
||||
dctx.fse_entropy = 1;
|
||||
let mut state = SequenceState {
|
||||
stream: DStream {
|
||||
bit_container: 0,
|
||||
bits_consumed: 0,
|
||||
ptr: ptr::null(),
|
||||
start: ptr::null(),
|
||||
},
|
||||
state_ll: FseDState {
|
||||
state: 0,
|
||||
table: ptr::null(),
|
||||
},
|
||||
state_off: FseDState {
|
||||
state: 0,
|
||||
table: ptr::null(),
|
||||
},
|
||||
state_ml: FseDState {
|
||||
state: 0,
|
||||
table: ptr::null(),
|
||||
},
|
||||
prev_offset: [
|
||||
dctx.rep[0] as usize,
|
||||
dctx.rep[1] as usize,
|
||||
dctx.rep[2] as usize,
|
||||
],
|
||||
};
|
||||
let stream_size = end.wrapping_sub(ip as usize);
|
||||
let init = init_dstream(&mut state.stream, ip, stream_size);
|
||||
if ERR_isError(init) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
fse_init_dstate(
|
||||
&mut state.state_ll,
|
||||
&mut state.stream,
|
||||
dctx.ll_table.as_ptr(),
|
||||
);
|
||||
fse_init_dstate(
|
||||
&mut state.state_off,
|
||||
&mut state.stream,
|
||||
dctx.off_table.as_ptr(),
|
||||
);
|
||||
fse_init_dstate(
|
||||
&mut state.state_ml,
|
||||
&mut state.stream,
|
||||
dctx.ml_table.as_ptr(),
|
||||
);
|
||||
while reload_dstream(&mut state.stream) <= DSTREAM_COMPLETED && nb_seq != 0 {
|
||||
nb_seq -= 1;
|
||||
let sequence = decode_sequence(&mut state);
|
||||
let one_size = exec_sequence(
|
||||
op,
|
||||
oend,
|
||||
sequence,
|
||||
&mut lit_ptr,
|
||||
lit_end,
|
||||
dctx.base,
|
||||
dctx.v_base,
|
||||
dctx.dict_end,
|
||||
);
|
||||
if ERR_isError(one_size) {
|
||||
return one_size;
|
||||
}
|
||||
op = op.add(one_size);
|
||||
}
|
||||
/* The v0.7 C decoder only validates that the declared sequence count
|
||||
* was consumed here. Its bitstream may retain padding bits, so an
|
||||
* exact end-of-stream check rejects valid historical frames. */
|
||||
if nb_seq != 0 {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
dctx.rep[0] = state.prev_offset[0] as u32;
|
||||
dctx.rep[1] = state.prev_offset[1] as u32;
|
||||
dctx.rep[2] = state.prev_offset[2] as u32;
|
||||
}
|
||||
|
||||
if lit_ptr as usize > lit_end as usize {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let last_literal_size = (lit_end as usize).wrapping_sub(lit_ptr as usize);
|
||||
if last_literal_size > (oend as usize).wrapping_sub(op as usize) {
|
||||
return ERROR(ZstdErrorCode::DstSizeTooSmall);
|
||||
}
|
||||
if last_literal_size != 0 {
|
||||
ptr::copy(lit_ptr, op, last_literal_size);
|
||||
op = op.add(last_literal_size);
|
||||
}
|
||||
(op as usize).wrapping_sub(ostart as usize)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn check_continuity(dctx: &mut ZSTDv07_DCtx, dst: *const u8) {
|
||||
if dst != dctx.previous_dst_end {
|
||||
dctx.dict_end = dctx.previous_dst_end;
|
||||
let delta = (dctx.previous_dst_end as usize).wrapping_sub(dctx.base as usize);
|
||||
dctx.v_base = (dst as usize).wrapping_sub(delta) as *const u8;
|
||||
dctx.base = dst;
|
||||
dctx.previous_dst_end = dst;
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn decompress_block_internal(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size >= BLOCKSIZE {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let literal_size = decode_literals_block(dctx, src, src_size);
|
||||
if ERR_isError(literal_size) {
|
||||
return literal_size;
|
||||
}
|
||||
decompress_sequences(
|
||||
dctx,
|
||||
dst,
|
||||
dst_capacity,
|
||||
src.add(literal_size),
|
||||
src_size - literal_size,
|
||||
)
|
||||
}
|
||||
|
||||
unsafe fn decompress_frame(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size < FRAME_HEADER_SIZE_MIN + BLOCK_HEADER_SIZE {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let mut ip = src;
|
||||
let mut remaining = src_size;
|
||||
let ostart = dst;
|
||||
let oend = (dst as usize).wrapping_add(dst_capacity) as *mut u8;
|
||||
let frame_size = frame_header_size(src, src_size);
|
||||
if ERR_isError(frame_size) {
|
||||
return frame_size;
|
||||
}
|
||||
if src_size < frame_size + BLOCK_HEADER_SIZE {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
let header_result = decode_frame_header(dctx, src, frame_size);
|
||||
if ERR_isError(header_result) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
ip = ip.add(frame_size);
|
||||
remaining -= frame_size;
|
||||
let mut op = dst;
|
||||
|
||||
loop {
|
||||
let mut properties = BlockProperties {
|
||||
block_type: BT_END,
|
||||
orig_size: 0,
|
||||
};
|
||||
let c_block_size = get_block_size(ip, remaining, &mut properties);
|
||||
if ERR_isError(c_block_size) {
|
||||
return c_block_size;
|
||||
}
|
||||
ip = ip.add(BLOCK_HEADER_SIZE);
|
||||
remaining -= BLOCK_HEADER_SIZE;
|
||||
if c_block_size > remaining {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
if properties.block_type == BT_END {
|
||||
if remaining != 0 {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
break;
|
||||
}
|
||||
let decoded_size = match properties.block_type {
|
||||
BT_COMPRESSED => decompress_block_internal(
|
||||
dctx,
|
||||
op,
|
||||
(oend as usize).wrapping_sub(op as usize),
|
||||
ip,
|
||||
c_block_size,
|
||||
),
|
||||
BT_RAW => copy_raw_block(
|
||||
op,
|
||||
(oend as usize).wrapping_sub(op as usize),
|
||||
ip,
|
||||
c_block_size,
|
||||
),
|
||||
BT_RLE => generate_n_bytes(
|
||||
op,
|
||||
(oend as usize).wrapping_sub(op as usize),
|
||||
*ip,
|
||||
properties.orig_size as usize,
|
||||
),
|
||||
_ => ERROR(ZstdErrorCode::Generic),
|
||||
};
|
||||
if ERR_isError(decoded_size) {
|
||||
return decoded_size;
|
||||
}
|
||||
if dctx.f_params.checksumFlag != 0 {
|
||||
xxh_update(&mut dctx.xxh_state, op, decoded_size);
|
||||
}
|
||||
op = op.add(decoded_size);
|
||||
ip = ip.add(c_block_size);
|
||||
remaining -= c_block_size;
|
||||
}
|
||||
(op as usize).wrapping_sub(ostart as usize)
|
||||
}
|
||||
|
||||
unsafe fn ref_dict_content(dctx: &mut ZSTDv07_DCtx, dict: *const u8, dict_size: usize) -> usize {
|
||||
dctx.dict_end = dctx.previous_dst_end;
|
||||
let delta = (dctx.previous_dst_end as usize).wrapping_sub(dctx.base as usize);
|
||||
dctx.v_base = (dict as usize).wrapping_sub(delta) as *const u8;
|
||||
dctx.base = dict;
|
||||
dctx.previous_dst_end = (dict as usize).wrapping_add(dict_size) as *const u8;
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn load_entropy(dctx: &mut ZSTDv07_DCtx, dict: *const u8, dict_size: usize) -> usize {
|
||||
let dict_start = dict as usize;
|
||||
let dict_end = dict_start.wrapping_add(dict_size);
|
||||
let mut dict_ptr = dict;
|
||||
{
|
||||
let table = &mut dctx.huf_table.x4;
|
||||
let h_size = huf_read_dtable_x4(table, dict_ptr, dict_size);
|
||||
if ERR_isError(h_size) {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
dict_ptr = dict_ptr.add(h_size);
|
||||
}
|
||||
|
||||
let mut read_entropy = |table: &mut [u32], max_value: u32, max_log: u32| -> usize {
|
||||
let mut norm = [0i16; 256];
|
||||
let mut max = max_value;
|
||||
let mut log = 0;
|
||||
let size = fse_read_ncount(
|
||||
&mut norm,
|
||||
&mut max,
|
||||
&mut log,
|
||||
dict_ptr,
|
||||
dict_end.wrapping_sub(dict_ptr as usize),
|
||||
);
|
||||
if ERR_isError(size) || log > max_log {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
let built = fse_build_dtable(table, &norm, max, log);
|
||||
if ERR_isError(built) {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
dict_ptr = dict_ptr.add(size);
|
||||
0
|
||||
};
|
||||
let result = read_entropy(&mut dctx.off_table, MAX_OFF, OFF_FSE_LOG);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
let result = read_entropy(&mut dctx.ml_table, MAX_ML, ML_FSE_LOG);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
let result = read_entropy(&mut dctx.ll_table, MAX_LL, LL_FSE_LOG);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
|
||||
if dict_ptr as usize > dict_end.wrapping_sub(12) {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
dctx.rep[0] = read_le32(dict_ptr);
|
||||
dctx.rep[1] = read_le32(dict_ptr.add(4));
|
||||
dctx.rep[2] = read_le32(dict_ptr.add(8));
|
||||
if dctx
|
||||
.rep
|
||||
.iter()
|
||||
.any(|&rep| rep == 0 || rep as usize >= dict_size)
|
||||
{
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
dict_ptr = dict_ptr.add(12);
|
||||
dctx.lit_entropy = 1;
|
||||
dctx.fse_entropy = 1;
|
||||
(dict_ptr as usize).wrapping_sub(dict_start)
|
||||
}
|
||||
|
||||
unsafe fn insert_dictionary(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
mut dict: *const u8,
|
||||
mut dict_size: usize,
|
||||
) -> usize {
|
||||
if dict_size < 8 || read_le32(dict) != ZSTD_DICT_MAGIC {
|
||||
return ref_dict_content(dctx, dict, dict_size);
|
||||
}
|
||||
dctx.dict_id = read_le32(dict.add(4));
|
||||
dict = dict.add(8);
|
||||
dict_size -= 8;
|
||||
let entropy_size = load_entropy(dctx, dict, dict_size);
|
||||
if ERR_isError(entropy_size) {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
dict = dict.add(entropy_size);
|
||||
dict_size -= entropy_size;
|
||||
ref_dict_content(dctx, dict, dict_size)
|
||||
}
|
||||
|
||||
unsafe fn decode_frame_header(dctx: &mut ZSTDv07_DCtx, src: *const u8, src_size: usize) -> usize {
|
||||
let result = get_frame_params_impl(&mut dctx.f_params, src, src_size);
|
||||
if dctx.f_params.dictID != 0 && dctx.dict_id != dctx.f_params.dictID {
|
||||
return ERROR(ZstdErrorCode::DictionaryWrong);
|
||||
}
|
||||
if dctx.f_params.checksumFlag != 0 {
|
||||
xxh_reset(&mut dctx.xxh_state, 0);
|
||||
}
|
||||
result
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn decompress_begin(dctx: &mut ZSTDv07_DCtx) -> usize {
|
||||
dctx.expected = FRAME_HEADER_SIZE_MIN;
|
||||
dctx.stage = STAGE_GET_FRAME_HEADER_SIZE;
|
||||
dctx.previous_dst_end = ptr::null();
|
||||
dctx.base = ptr::null();
|
||||
dctx.v_base = ptr::null();
|
||||
dctx.dict_end = ptr::null();
|
||||
dctx.huf_table.x2[0] = huf_initial_desc();
|
||||
dctx.lit_entropy = 0;
|
||||
dctx.fse_entropy = 0;
|
||||
dctx.dict_id = 0;
|
||||
dctx.rep = [1, 4, 8];
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn create_dctx_advanced_impl(custom_mem: ZSTDv07_customMem) -> *mut ZSTDv07_DCtx {
|
||||
let custom_mem = match normalized_custom_mem(custom_mem) {
|
||||
Some(value) => value,
|
||||
None => return ptr::null_mut(),
|
||||
};
|
||||
let dctx = match custom_mem.customAlloc {
|
||||
Some(alloc) => {
|
||||
alloc(custom_mem.opaque, std::mem::size_of::<ZSTDv07_DCtx>()) as *mut ZSTDv07_DCtx
|
||||
}
|
||||
None => return ptr::null_mut(),
|
||||
};
|
||||
if dctx.is_null() {
|
||||
return ptr::null_mut();
|
||||
}
|
||||
ptr::write_bytes(dctx.cast::<u8>(), 0, std::mem::size_of::<ZSTDv07_DCtx>());
|
||||
(*dctx).custom_mem = custom_mem;
|
||||
decompress_begin(&mut *dctx);
|
||||
dctx
|
||||
}
|
||||
|
||||
unsafe fn free_dctx_impl(dctx: *mut ZSTDv07_DCtx) -> usize {
|
||||
if dctx.is_null() {
|
||||
return 0;
|
||||
}
|
||||
if let Some(free) = (*dctx).custom_mem.customFree {
|
||||
free((*dctx).custom_mem.opaque, dctx.cast::<c_void>());
|
||||
}
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn copy_dctx_impl(dst: *mut ZSTDv07_DCtx, src: *const ZSTDv07_DCtx) {
|
||||
let prefix = (&(*dst).lit_buffer as *const _ as usize).wrapping_sub(dst as usize);
|
||||
ptr::copy_nonoverlapping(src.cast::<u8>(), dst.cast::<u8>(), prefix);
|
||||
}
|
||||
|
||||
unsafe fn decompress_begin_using_dict_impl(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dict: *const u8,
|
||||
dict_size: usize,
|
||||
) -> usize {
|
||||
let result = decompress_begin(dctx);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
if !dict.is_null() && dict_size != 0 {
|
||||
let result = insert_dictionary(dctx, dict, dict_size);
|
||||
if ERR_isError(result) {
|
||||
return ERROR(ZstdErrorCode::DictionaryCorrupted);
|
||||
}
|
||||
}
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn decompress_continue_impl(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
if src_size != dctx.expected {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
if dst_capacity != 0 {
|
||||
check_continuity(dctx, dst);
|
||||
}
|
||||
|
||||
match dctx.stage {
|
||||
STAGE_GET_FRAME_HEADER_SIZE => {
|
||||
if src_size != FRAME_HEADER_SIZE_MIN {
|
||||
return ERROR(ZstdErrorCode::SrcSizeWrong);
|
||||
}
|
||||
if (read_le32(src) & 0xffff_fff0) == SKIPPABLE_MAGIC_START {
|
||||
ptr::copy_nonoverlapping(
|
||||
src,
|
||||
dctx.header_buffer.as_mut_ptr(),
|
||||
FRAME_HEADER_SIZE_MIN,
|
||||
);
|
||||
dctx.expected = SKIPPABLE_HEADER_SIZE - FRAME_HEADER_SIZE_MIN;
|
||||
dctx.stage = STAGE_DECODE_SKIPPABLE_HEADER;
|
||||
return 0;
|
||||
}
|
||||
dctx.header_size = frame_header_size(src, FRAME_HEADER_SIZE_MIN);
|
||||
if ERR_isError(dctx.header_size) {
|
||||
return dctx.header_size;
|
||||
}
|
||||
ptr::copy_nonoverlapping(src, dctx.header_buffer.as_mut_ptr(), FRAME_HEADER_SIZE_MIN);
|
||||
if dctx.header_size > FRAME_HEADER_SIZE_MIN {
|
||||
dctx.expected = dctx.header_size - FRAME_HEADER_SIZE_MIN;
|
||||
dctx.stage = STAGE_DECODE_FRAME_HEADER;
|
||||
return 0;
|
||||
}
|
||||
dctx.expected = 0;
|
||||
// The five-byte direct header is complete. Continue as if the
|
||||
// second header chunk had just been supplied.
|
||||
let result = decode_frame_header(dctx, dctx.header_buffer.as_ptr(), dctx.header_size);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
dctx.expected = BLOCK_HEADER_SIZE;
|
||||
dctx.stage = STAGE_DECODE_BLOCK_HEADER;
|
||||
0
|
||||
}
|
||||
STAGE_DECODE_FRAME_HEADER => {
|
||||
if dctx.expected != 0 {
|
||||
ptr::copy_nonoverlapping(
|
||||
src,
|
||||
dctx.header_buffer.as_mut_ptr().add(FRAME_HEADER_SIZE_MIN),
|
||||
dctx.expected,
|
||||
);
|
||||
}
|
||||
let result = decode_frame_header(dctx, dctx.header_buffer.as_ptr(), dctx.header_size);
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
dctx.expected = BLOCK_HEADER_SIZE;
|
||||
dctx.stage = STAGE_DECODE_BLOCK_HEADER;
|
||||
0
|
||||
}
|
||||
STAGE_DECODE_BLOCK_HEADER => {
|
||||
let mut properties = BlockProperties {
|
||||
block_type: BT_END,
|
||||
orig_size: 0,
|
||||
};
|
||||
let c_block_size = get_block_size(src, BLOCK_HEADER_SIZE, &mut properties);
|
||||
if ERR_isError(c_block_size) {
|
||||
return c_block_size;
|
||||
}
|
||||
if properties.block_type == BT_END {
|
||||
if dctx.f_params.checksumFlag != 0 {
|
||||
let hash = xxh_digest(&dctx.xxh_state);
|
||||
let expected = ((hash >> 11) as u32) & ((1 << 22) - 1);
|
||||
let actual = *src.add(2) as u32
|
||||
+ ((*src.add(1) as u32) << 8)
|
||||
+ (((*src as u32) & 0x3f) << 16);
|
||||
if expected != actual {
|
||||
return ERROR(ZstdErrorCode::ChecksumWrong);
|
||||
}
|
||||
}
|
||||
dctx.expected = 0;
|
||||
dctx.stage = STAGE_GET_FRAME_HEADER_SIZE;
|
||||
} else {
|
||||
dctx.expected = c_block_size;
|
||||
dctx.b_type = properties.block_type;
|
||||
dctx.stage = STAGE_DECOMPRESS_BLOCK;
|
||||
}
|
||||
0
|
||||
}
|
||||
STAGE_DECOMPRESS_BLOCK => {
|
||||
let result = match dctx.b_type {
|
||||
BT_COMPRESSED => decompress_block_internal(dctx, dst, dst_capacity, src, src_size),
|
||||
BT_RAW => copy_raw_block(dst, dst_capacity, src, src_size),
|
||||
BT_RLE => ERROR(ZstdErrorCode::Generic),
|
||||
BT_END => 0,
|
||||
_ => ERROR(ZstdErrorCode::Generic),
|
||||
};
|
||||
dctx.stage = STAGE_DECODE_BLOCK_HEADER;
|
||||
dctx.expected = BLOCK_HEADER_SIZE;
|
||||
if ERR_isError(result) {
|
||||
return result;
|
||||
}
|
||||
dctx.previous_dst_end = (dst as usize).wrapping_add(result) as *const u8;
|
||||
if dctx.f_params.checksumFlag != 0 {
|
||||
xxh_update(&mut dctx.xxh_state, dst, result);
|
||||
}
|
||||
result
|
||||
}
|
||||
STAGE_DECODE_SKIPPABLE_HEADER => {
|
||||
ptr::copy_nonoverlapping(
|
||||
src,
|
||||
dctx.header_buffer.as_mut_ptr().add(FRAME_HEADER_SIZE_MIN),
|
||||
dctx.expected,
|
||||
);
|
||||
dctx.expected = read_le32(dctx.header_buffer.as_ptr().add(4)) as usize;
|
||||
dctx.stage = STAGE_SKIP_FRAME;
|
||||
0
|
||||
}
|
||||
STAGE_SKIP_FRAME => {
|
||||
dctx.expected = 0;
|
||||
dctx.stage = STAGE_GET_FRAME_HEADER_SIZE;
|
||||
0
|
||||
}
|
||||
_ => ERROR(ZstdErrorCode::Generic),
|
||||
}
|
||||
}
|
||||
|
||||
unsafe fn find_frame_size_info_impl(
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
c_size: *mut usize,
|
||||
d_bound: *mut u64,
|
||||
) {
|
||||
let error = |ret: usize| unsafe {
|
||||
*c_size = ret;
|
||||
*d_bound = ZSTD_CONTENTSIZE_ERROR;
|
||||
};
|
||||
if src_size < FRAME_HEADER_SIZE_MIN + BLOCK_HEADER_SIZE {
|
||||
error(ERROR(ZstdErrorCode::SrcSizeWrong));
|
||||
return;
|
||||
}
|
||||
let header_size = frame_header_size(src, src_size);
|
||||
if ERR_isError(header_size) {
|
||||
error(header_size);
|
||||
return;
|
||||
}
|
||||
if read_le32(src) != ZSTD_MAGIC_NUMBER {
|
||||
error(ERROR(ZstdErrorCode::PrefixUnknown));
|
||||
return;
|
||||
}
|
||||
if src_size < header_size + BLOCK_HEADER_SIZE {
|
||||
error(ERROR(ZstdErrorCode::SrcSizeWrong));
|
||||
return;
|
||||
}
|
||||
let mut ip = src.add(header_size);
|
||||
let mut remaining = src_size - header_size;
|
||||
let mut blocks = 0usize;
|
||||
loop {
|
||||
let mut properties = BlockProperties {
|
||||
block_type: BT_END,
|
||||
orig_size: 0,
|
||||
};
|
||||
let c_block_size = get_block_size(ip, remaining, &mut properties);
|
||||
if ERR_isError(c_block_size) {
|
||||
error(c_block_size);
|
||||
return;
|
||||
}
|
||||
ip = ip.add(BLOCK_HEADER_SIZE);
|
||||
remaining -= BLOCK_HEADER_SIZE;
|
||||
if properties.block_type == BT_END {
|
||||
break;
|
||||
}
|
||||
if c_block_size > remaining {
|
||||
error(ERROR(ZstdErrorCode::SrcSizeWrong));
|
||||
return;
|
||||
}
|
||||
ip = ip.add(c_block_size);
|
||||
remaining -= c_block_size;
|
||||
blocks = blocks.wrapping_add(1);
|
||||
}
|
||||
*c_size = (ip as usize).wrapping_sub(src as usize);
|
||||
*d_bound = (blocks.wrapping_mul(BLOCKSIZE)) as u64;
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
pub struct ZSTDv07_DDict {
|
||||
dict: *mut c_void,
|
||||
dict_size: usize,
|
||||
ref_context: *mut ZSTDv07_DCtx,
|
||||
}
|
||||
|
||||
unsafe fn create_ddict_advanced_impl(
|
||||
dict: *const u8,
|
||||
dict_size: usize,
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
) -> *mut ZSTDv07_DDict {
|
||||
let custom_mem = match normalized_custom_mem(custom_mem) {
|
||||
Some(value) => value,
|
||||
None => return ptr::null_mut(),
|
||||
};
|
||||
let alloc = custom_mem.customAlloc.unwrap();
|
||||
let free = custom_mem.customFree.unwrap();
|
||||
let ddict =
|
||||
alloc(custom_mem.opaque, std::mem::size_of::<ZSTDv07_DDict>()) as *mut ZSTDv07_DDict;
|
||||
let dict_content = alloc(custom_mem.opaque, dict_size);
|
||||
let dctx = create_dctx_advanced_impl(custom_mem);
|
||||
if ddict.is_null() || dict_content.is_null() || dctx.is_null() {
|
||||
free(custom_mem.opaque, dict_content);
|
||||
free(custom_mem.opaque, ddict.cast());
|
||||
free(custom_mem.opaque, dctx.cast());
|
||||
return ptr::null_mut();
|
||||
}
|
||||
ptr::copy_nonoverlapping(dict, dict_content.cast::<u8>(), dict_size);
|
||||
let result =
|
||||
decompress_begin_using_dict_impl(dctx.as_mut().unwrap(), dict_content.cast(), dict_size);
|
||||
if ERR_isError(result) {
|
||||
free(custom_mem.opaque, dict_content);
|
||||
free(custom_mem.opaque, ddict.cast());
|
||||
free(custom_mem.opaque, dctx.cast());
|
||||
return ptr::null_mut();
|
||||
}
|
||||
(*ddict).dict = dict_content;
|
||||
(*ddict).dict_size = dict_size;
|
||||
(*ddict).ref_context = dctx;
|
||||
ddict
|
||||
}
|
||||
|
||||
unsafe fn decompress_using_prepared_impl(
|
||||
dctx: &mut ZSTDv07_DCtx,
|
||||
ref_dctx: &ZSTDv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
copy_dctx_impl(dctx, ref_dctx);
|
||||
check_continuity(dctx, dst);
|
||||
decompress_frame(dctx, dst, dst_capacity, src, src_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTDv07_isError(code: usize) -> c_uint {
|
||||
ERR_isError(code) as c_uint
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTDv07_getErrorName(code: usize) -> *const c_char {
|
||||
ERR_getErrorName(code)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_estimateDCtxSize() -> usize {
|
||||
std::mem::size_of::<ZSTDv07_DCtx>()
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_sizeofDCtx(_: *const ZSTDv07_DCtx) -> usize {
|
||||
std::mem::size_of::<ZSTDv07_DCtx>()
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_createDCtx_advanced(
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
) -> *mut ZSTDv07_DCtx {
|
||||
create_dctx_advanced_impl(custom_mem)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_createDCtx() -> *mut ZSTDv07_DCtx {
|
||||
create_dctx_advanced_impl(default_custom_mem())
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_freeDCtx(dctx: *mut ZSTDv07_DCtx) -> usize {
|
||||
free_dctx_impl(dctx)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompressBegin(dctx: *mut ZSTDv07_DCtx) -> usize {
|
||||
decompress_begin(&mut *dctx)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_copyDCtx(
|
||||
dst_dctx: *mut ZSTDv07_DCtx,
|
||||
src_dctx: *const ZSTDv07_DCtx,
|
||||
) {
|
||||
copy_dctx_impl(dst_dctx, src_dctx)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompressBegin_usingDict(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dict: *const c_void,
|
||||
dict_size: usize,
|
||||
) -> usize {
|
||||
decompress_begin_using_dict_impl(&mut *dctx, dict.cast(), dict_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_nextSrcSizeToDecompress(dctx: *const ZSTDv07_DCtx) -> usize {
|
||||
(*dctx).expected
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_isSkipFrame(dctx: *const ZSTDv07_DCtx) -> i32 {
|
||||
((*dctx).stage == STAGE_SKIP_FRAME) as i32
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompressContinue(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
decompress_continue_impl(&mut *dctx, dst.cast(), dst_capacity, src.cast(), src_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompressBlock(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
let dctx = &mut *dctx;
|
||||
let dst = dst.cast::<u8>();
|
||||
check_continuity(dctx, dst);
|
||||
let result = decompress_block_internal(dctx, dst, dst_capacity, src.cast(), src_size);
|
||||
dctx.previous_dst_end = (dst as usize).wrapping_add(result) as *const u8;
|
||||
result
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_insertBlock(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
block_start: *const c_void,
|
||||
block_size: usize,
|
||||
) -> usize {
|
||||
let dctx = &mut *dctx;
|
||||
check_continuity(dctx, block_start.cast());
|
||||
dctx.previous_dst_end = (block_start as usize).wrapping_add(block_size) as *const u8;
|
||||
block_size
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_getFrameParams(
|
||||
f_params: *mut ZSTDv07_frameParams,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
get_frame_params_impl(&mut *f_params, src.cast(), src_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_getDecompressedSize(src: *const c_void, src_size: usize) -> u64 {
|
||||
let mut f_params = ZSTDv07_frameParams {
|
||||
frameContentSize: 0,
|
||||
windowSize: 0,
|
||||
dictID: 0,
|
||||
checksumFlag: 0,
|
||||
};
|
||||
if get_frame_params_impl(&mut f_params, src.cast(), src_size) != 0 {
|
||||
0
|
||||
} else {
|
||||
f_params.frameContentSize
|
||||
}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompress_usingDict(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
dict: *const c_void,
|
||||
dict_size: usize,
|
||||
) -> usize {
|
||||
let dctx = &mut *dctx;
|
||||
let _ = decompress_begin_using_dict_impl(dctx, dict.cast(), dict_size);
|
||||
check_continuity(dctx, dst.cast());
|
||||
decompress_frame(dctx, dst.cast(), dst_capacity, src.cast(), src_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompressDCtx(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
ZSTDv07_decompress_usingDict(dctx, dst, dst_capacity, src, src_size, ptr::null(), 0)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompress(
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
let dctx = ZSTDv07_createDCtx();
|
||||
if dctx.is_null() {
|
||||
return ERROR(ZstdErrorCode::MemoryAllocation);
|
||||
}
|
||||
let result = ZSTDv07_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
|
||||
ZSTDv07_freeDCtx(dctx);
|
||||
result
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_findFrameSizeInfoLegacy(
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
c_size: *mut usize,
|
||||
d_bound: *mut u64,
|
||||
) {
|
||||
find_frame_size_info_impl(src.cast(), src_size, c_size, d_bound)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_createDDict(
|
||||
dict: *const c_void,
|
||||
dict_size: usize,
|
||||
) -> *mut ZSTDv07_DDict {
|
||||
create_ddict_advanced_impl(dict.cast(), dict_size, default_custom_mem())
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_createDDict_advanced(
|
||||
dict: *const c_void,
|
||||
dict_size: usize,
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
) -> *mut ZSTDv07_DDict {
|
||||
create_ddict_advanced_impl(dict.cast(), dict_size, custom_mem)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_freeDDict(ddict: *mut ZSTDv07_DDict) -> usize {
|
||||
let ref_context = (*ddict).ref_context;
|
||||
let custom_mem = (*ref_context).custom_mem;
|
||||
ZSTDv07_freeDCtx(ref_context);
|
||||
if let Some(free) = custom_mem.customFree {
|
||||
free(custom_mem.opaque, (*ddict).dict);
|
||||
free(custom_mem.opaque, ddict.cast());
|
||||
}
|
||||
0
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTDv07_decompress_usingDDict(
|
||||
dctx: *mut ZSTDv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity: usize,
|
||||
src: *const c_void,
|
||||
src_size: usize,
|
||||
ddict: *const ZSTDv07_DDict,
|
||||
) -> usize {
|
||||
decompress_using_prepared_impl(
|
||||
&mut *dctx,
|
||||
&*(*ddict).ref_context,
|
||||
dst.cast(),
|
||||
dst_capacity,
|
||||
src.cast(),
|
||||
src_size,
|
||||
)
|
||||
}
|
||||
|
||||
#[repr(C)]
|
||||
pub struct ZBUFFv07_DCtx {
|
||||
zd: *mut ZSTDv07_DCtx,
|
||||
f_params: ZSTDv07_frameParams,
|
||||
stage: u32,
|
||||
in_buff: *mut u8,
|
||||
in_buff_size: usize,
|
||||
in_pos: usize,
|
||||
out_buff: *mut u8,
|
||||
out_buff_size: usize,
|
||||
out_start: usize,
|
||||
out_end: usize,
|
||||
block_size: usize,
|
||||
header_buffer: [u8; FRAME_HEADER_SIZE_MAX],
|
||||
lh_size: usize,
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
}
|
||||
|
||||
const BUFF_STAGE_INIT: u32 = 0;
|
||||
const BUFF_STAGE_LOAD_HEADER: u32 = 1;
|
||||
const BUFF_STAGE_READ: u32 = 2;
|
||||
const BUFF_STAGE_LOAD: u32 = 3;
|
||||
const BUFF_STAGE_FLUSH: u32 = 4;
|
||||
|
||||
unsafe fn buff_free_impl(zbd: *mut ZBUFFv07_DCtx) -> usize {
|
||||
if zbd.is_null() {
|
||||
return 0;
|
||||
}
|
||||
ZSTDv07_freeDCtx((*zbd).zd);
|
||||
if let Some(free) = (*zbd).custom_mem.customFree {
|
||||
if !(*zbd).in_buff.is_null() {
|
||||
free((*zbd).custom_mem.opaque, (*zbd).in_buff.cast());
|
||||
}
|
||||
if !(*zbd).out_buff.is_null() {
|
||||
free((*zbd).custom_mem.opaque, (*zbd).out_buff.cast());
|
||||
}
|
||||
free((*zbd).custom_mem.opaque, zbd.cast());
|
||||
}
|
||||
0
|
||||
}
|
||||
|
||||
unsafe fn buff_create_advanced_impl(custom_mem: ZSTDv07_customMem) -> *mut ZBUFFv07_DCtx {
|
||||
let custom_mem = match normalized_custom_mem(custom_mem) {
|
||||
Some(value) => value,
|
||||
None => return ptr::null_mut(),
|
||||
};
|
||||
let zbd = match custom_mem.customAlloc {
|
||||
Some(alloc) => {
|
||||
alloc(custom_mem.opaque, std::mem::size_of::<ZBUFFv07_DCtx>()) as *mut ZBUFFv07_DCtx
|
||||
}
|
||||
None => return ptr::null_mut(),
|
||||
};
|
||||
if zbd.is_null() {
|
||||
return ptr::null_mut();
|
||||
}
|
||||
ptr::write_bytes(zbd.cast::<u8>(), 0, std::mem::size_of::<ZBUFFv07_DCtx>());
|
||||
(*zbd).custom_mem = custom_mem;
|
||||
(*zbd).zd = ZSTDv07_createDCtx_advanced(custom_mem);
|
||||
if (*zbd).zd.is_null() {
|
||||
buff_free_impl(zbd);
|
||||
return ptr::null_mut();
|
||||
}
|
||||
(*zbd).stage = BUFF_STAGE_INIT;
|
||||
zbd
|
||||
}
|
||||
|
||||
unsafe fn buff_init_dictionary_impl(
|
||||
zbd: &mut ZBUFFv07_DCtx,
|
||||
dict: *const u8,
|
||||
dict_size: usize,
|
||||
) -> usize {
|
||||
zbd.stage = BUFF_STAGE_LOAD_HEADER;
|
||||
zbd.lh_size = 0;
|
||||
zbd.in_pos = 0;
|
||||
zbd.out_start = 0;
|
||||
zbd.out_end = 0;
|
||||
ZSTDv07_decompressBegin_usingDict(zbd.zd, dict.cast(), dict_size)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
unsafe fn buff_limit_copy(
|
||||
dst: *mut u8,
|
||||
dst_capacity: usize,
|
||||
src: *const u8,
|
||||
src_size: usize,
|
||||
) -> usize {
|
||||
let size = dst_capacity.min(src_size);
|
||||
if size != 0 {
|
||||
ptr::copy(src, dst, size);
|
||||
}
|
||||
size
|
||||
}
|
||||
|
||||
unsafe fn buff_decompress_continue_impl(
|
||||
zbd: &mut ZBUFFv07_DCtx,
|
||||
dst: *mut u8,
|
||||
dst_capacity_ptr: *mut usize,
|
||||
src: *const u8,
|
||||
src_size_ptr: *mut usize,
|
||||
) -> usize {
|
||||
let input_size = *src_size_ptr;
|
||||
let input_start = src as usize;
|
||||
let mut ip = input_start;
|
||||
let input_end = input_start.wrapping_add(input_size);
|
||||
let output_start = dst as usize;
|
||||
let mut op = output_start;
|
||||
let output_end = output_start.wrapping_add(*dst_capacity_ptr);
|
||||
let mut not_done = true;
|
||||
|
||||
while not_done {
|
||||
match zbd.stage {
|
||||
BUFF_STAGE_INIT => return ERROR(ZstdErrorCode::InitMissing),
|
||||
BUFF_STAGE_LOAD_HEADER => {
|
||||
let header_size = get_frame_params_impl(
|
||||
&mut zbd.f_params,
|
||||
zbd.header_buffer.as_ptr(),
|
||||
zbd.lh_size,
|
||||
);
|
||||
if ERR_isError(header_size) {
|
||||
return header_size;
|
||||
}
|
||||
if header_size != 0 {
|
||||
let to_load = header_size - zbd.lh_size;
|
||||
if to_load > input_end.wrapping_sub(ip) {
|
||||
let available = input_end.wrapping_sub(ip);
|
||||
if available != 0 {
|
||||
ptr::copy(
|
||||
ip as *const u8,
|
||||
zbd.header_buffer.as_mut_ptr().add(zbd.lh_size),
|
||||
available,
|
||||
);
|
||||
}
|
||||
zbd.lh_size += available;
|
||||
*dst_capacity_ptr = 0;
|
||||
return header_size - zbd.lh_size + BLOCK_HEADER_SIZE;
|
||||
}
|
||||
ptr::copy(
|
||||
ip as *const u8,
|
||||
zbd.header_buffer.as_mut_ptr().add(zbd.lh_size),
|
||||
to_load,
|
||||
);
|
||||
zbd.lh_size = header_size;
|
||||
ip = ip.wrapping_add(to_load);
|
||||
continue;
|
||||
}
|
||||
zbd.stage = BUFF_STAGE_READ;
|
||||
|
||||
let h1_size = ZSTDv07_nextSrcSizeToDecompress(zbd.zd);
|
||||
let h1_result = ZSTDv07_decompressContinue(
|
||||
zbd.zd,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
zbd.header_buffer.as_ptr().cast(),
|
||||
h1_size,
|
||||
);
|
||||
if ERR_isError(h1_result) {
|
||||
return h1_result;
|
||||
}
|
||||
if h1_size < zbd.lh_size {
|
||||
let h2_size = ZSTDv07_nextSrcSizeToDecompress(zbd.zd);
|
||||
let h2_result = ZSTDv07_decompressContinue(
|
||||
zbd.zd,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
zbd.header_buffer.as_ptr().add(h1_size).cast(),
|
||||
h2_size,
|
||||
);
|
||||
if ERR_isError(h2_result) {
|
||||
return h2_result;
|
||||
}
|
||||
}
|
||||
|
||||
zbd.f_params.windowSize = zbd
|
||||
.f_params
|
||||
.windowSize
|
||||
.max(1u32 << ZSTD_WINDOWLOG_ABSOLUTE_MIN);
|
||||
zbd.block_size = (zbd.f_params.windowSize as usize).min(BLOCKSIZE);
|
||||
let alloc = zbd.custom_mem.customAlloc.unwrap();
|
||||
let free = zbd.custom_mem.customFree.unwrap();
|
||||
if zbd.in_buff_size < zbd.block_size {
|
||||
if !zbd.in_buff.is_null() {
|
||||
free(zbd.custom_mem.opaque, zbd.in_buff.cast());
|
||||
}
|
||||
zbd.in_buff_size = zbd.block_size;
|
||||
zbd.in_buff = alloc(zbd.custom_mem.opaque, zbd.in_buff_size).cast();
|
||||
if zbd.in_buff.is_null() {
|
||||
return ERROR(ZstdErrorCode::MemoryAllocation);
|
||||
}
|
||||
}
|
||||
let needed_out_size =
|
||||
zbd.f_params.windowSize as usize + zbd.block_size + WILDCOPY_OVERLENGTH * 2;
|
||||
if zbd.out_buff_size < needed_out_size {
|
||||
if !zbd.out_buff.is_null() {
|
||||
free(zbd.custom_mem.opaque, zbd.out_buff.cast());
|
||||
}
|
||||
zbd.out_buff_size = needed_out_size;
|
||||
zbd.out_buff = alloc(zbd.custom_mem.opaque, needed_out_size).cast();
|
||||
if zbd.out_buff.is_null() {
|
||||
return ERROR(ZstdErrorCode::MemoryAllocation);
|
||||
}
|
||||
}
|
||||
// pass through to the read stage
|
||||
}
|
||||
BUFF_STAGE_READ => {
|
||||
let needed = ZSTDv07_nextSrcSizeToDecompress(zbd.zd);
|
||||
if needed == 0 {
|
||||
zbd.stage = BUFF_STAGE_INIT;
|
||||
not_done = false;
|
||||
continue;
|
||||
}
|
||||
if input_end.wrapping_sub(ip) >= needed {
|
||||
let is_skip = ZSTDv07_isSkipFrame(zbd.zd) != 0;
|
||||
let decoded = ZSTDv07_decompressContinue(
|
||||
zbd.zd,
|
||||
zbd.out_buff.add(zbd.out_start).cast(),
|
||||
if is_skip {
|
||||
0
|
||||
} else {
|
||||
zbd.out_buff_size - zbd.out_start
|
||||
},
|
||||
ip as *const c_void,
|
||||
needed,
|
||||
);
|
||||
if ERR_isError(decoded) {
|
||||
return decoded;
|
||||
}
|
||||
ip = ip.wrapping_add(needed);
|
||||
if decoded == 0 && !is_skip {
|
||||
continue;
|
||||
}
|
||||
zbd.out_end = zbd.out_start + decoded;
|
||||
zbd.stage = BUFF_STAGE_FLUSH;
|
||||
continue;
|
||||
}
|
||||
if ip == input_end {
|
||||
not_done = false;
|
||||
continue;
|
||||
}
|
||||
zbd.stage = BUFF_STAGE_LOAD;
|
||||
}
|
||||
BUFF_STAGE_LOAD => {
|
||||
let needed = ZSTDv07_nextSrcSizeToDecompress(zbd.zd);
|
||||
let to_load = needed.wrapping_sub(zbd.in_pos);
|
||||
if to_load > zbd.in_buff_size.wrapping_sub(zbd.in_pos) {
|
||||
return ERROR(ZstdErrorCode::CorruptionDetected);
|
||||
}
|
||||
let loaded = buff_limit_copy(
|
||||
zbd.in_buff.add(zbd.in_pos),
|
||||
to_load,
|
||||
ip as *const u8,
|
||||
input_end.wrapping_sub(ip),
|
||||
);
|
||||
ip = ip.wrapping_add(loaded);
|
||||
zbd.in_pos += loaded;
|
||||
if loaded < to_load {
|
||||
not_done = false;
|
||||
continue;
|
||||
}
|
||||
let is_skip = ZSTDv07_isSkipFrame(zbd.zd) != 0;
|
||||
let decoded = ZSTDv07_decompressContinue(
|
||||
zbd.zd,
|
||||
zbd.out_buff.add(zbd.out_start).cast(),
|
||||
zbd.out_buff_size - zbd.out_start,
|
||||
zbd.in_buff.cast(),
|
||||
needed,
|
||||
);
|
||||
if ERR_isError(decoded) {
|
||||
return decoded;
|
||||
}
|
||||
zbd.in_pos = 0;
|
||||
if decoded == 0 && !is_skip {
|
||||
zbd.stage = BUFF_STAGE_READ;
|
||||
continue;
|
||||
}
|
||||
zbd.out_end = zbd.out_start + decoded;
|
||||
zbd.stage = BUFF_STAGE_FLUSH;
|
||||
}
|
||||
BUFF_STAGE_FLUSH => {
|
||||
let to_flush = zbd.out_end.wrapping_sub(zbd.out_start);
|
||||
let flushed = buff_limit_copy(
|
||||
op as *mut u8,
|
||||
output_end.wrapping_sub(op),
|
||||
zbd.out_buff.add(zbd.out_start),
|
||||
to_flush,
|
||||
);
|
||||
op = op.wrapping_add(flushed);
|
||||
zbd.out_start += flushed;
|
||||
if flushed == to_flush {
|
||||
zbd.stage = BUFF_STAGE_READ;
|
||||
if zbd.out_start + zbd.block_size > zbd.out_buff_size {
|
||||
zbd.out_start = 0;
|
||||
zbd.out_end = 0;
|
||||
}
|
||||
} else {
|
||||
not_done = false;
|
||||
}
|
||||
}
|
||||
_ => return ERROR(ZstdErrorCode::Generic),
|
||||
}
|
||||
}
|
||||
|
||||
*src_size_ptr = ip.wrapping_sub(input_start);
|
||||
*dst_capacity_ptr = op.wrapping_sub(output_start);
|
||||
let next = ZSTDv07_nextSrcSizeToDecompress(zbd.zd);
|
||||
next.wrapping_sub(zbd.in_pos)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZBUFFv07_isError(code: usize) -> c_uint {
|
||||
ERR_isError(code) as c_uint
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZBUFFv07_getErrorName(code: usize) -> *const c_char {
|
||||
ERR_getErrorName(code)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZBUFFv07_recommendedDInSize() -> usize {
|
||||
BLOCKSIZE + BLOCK_HEADER_SIZE
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZBUFFv07_recommendedDOutSize() -> usize {
|
||||
BLOCKSIZE
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_createDCtx_advanced(
|
||||
custom_mem: ZSTDv07_customMem,
|
||||
) -> *mut ZBUFFv07_DCtx {
|
||||
buff_create_advanced_impl(custom_mem)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_createDCtx() -> *mut ZBUFFv07_DCtx {
|
||||
buff_create_advanced_impl(default_custom_mem())
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_freeDCtx(dctx: *mut ZBUFFv07_DCtx) -> usize {
|
||||
buff_free_impl(dctx)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_decompressInitDictionary(
|
||||
dctx: *mut ZBUFFv07_DCtx,
|
||||
dict: *const c_void,
|
||||
dict_size: usize,
|
||||
) -> usize {
|
||||
buff_init_dictionary_impl(&mut *dctx, dict.cast(), dict_size)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_decompressInit(dctx: *mut ZBUFFv07_DCtx) -> usize {
|
||||
buff_init_dictionary_impl(&mut *dctx, ptr::null(), 0)
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZBUFFv07_decompressContinue(
|
||||
dctx: *mut ZBUFFv07_DCtx,
|
||||
dst: *mut c_void,
|
||||
dst_capacity_ptr: *mut usize,
|
||||
src: *const c_void,
|
||||
src_size_ptr: *mut usize,
|
||||
) -> usize {
|
||||
buff_decompress_continue_impl(
|
||||
&mut *dctx,
|
||||
dst.cast(),
|
||||
dst_capacity_ptr,
|
||||
src.cast(),
|
||||
src_size_ptr,
|
||||
)
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use std::ffi::CStr;
|
||||
|
||||
fn raw_frame(payload: &[u8]) -> Vec<u8> {
|
||||
assert!(payload.len() <= 255);
|
||||
let mut frame = Vec::with_capacity(6 + 3 + payload.len() + 3);
|
||||
frame.extend_from_slice(&ZSTD_MAGIC_NUMBER.to_le_bytes());
|
||||
frame.push(0x20); // direct mode, one-byte content-size field
|
||||
frame.push(payload.len() as u8);
|
||||
frame.extend_from_slice(&[
|
||||
0x40 | (((payload.len() >> 16) & 7) as u8),
|
||||
(payload.len() >> 8) as u8,
|
||||
payload.len() as u8,
|
||||
]);
|
||||
frame.extend_from_slice(payload);
|
||||
frame.extend_from_slice(&[0xc0, 0, 0]);
|
||||
frame
|
||||
}
|
||||
|
||||
fn rle_frame(byte: u8, size: usize) -> Vec<u8> {
|
||||
assert!(size <= 255);
|
||||
let mut frame = Vec::with_capacity(6 + 3 + 1 + 3);
|
||||
frame.extend_from_slice(&ZSTD_MAGIC_NUMBER.to_le_bytes());
|
||||
frame.push(0x20);
|
||||
frame.push(size as u8);
|
||||
frame.extend_from_slice(&[0x80, 0, size as u8, byte]);
|
||||
frame.extend_from_slice(&[0xc0, 0, 0]);
|
||||
frame
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn raw_frame_simple_api_and_metadata() {
|
||||
let payload = b"legacy-v07";
|
||||
let frame = raw_frame(payload);
|
||||
let mut params = ZSTDv07_frameParams {
|
||||
frameContentSize: 0,
|
||||
windowSize: 0,
|
||||
dictID: 0,
|
||||
checksumFlag: 0,
|
||||
};
|
||||
unsafe {
|
||||
assert_eq!(
|
||||
ZSTDv07_getFrameParams(&mut params, frame.as_ptr().cast(), 5),
|
||||
6
|
||||
);
|
||||
assert_eq!(
|
||||
ZSTDv07_getFrameParams(&mut params, frame.as_ptr().cast(), frame.len()),
|
||||
0
|
||||
);
|
||||
assert_eq!(params.frameContentSize, payload.len() as u64);
|
||||
assert_eq!(params.windowSize, payload.len() as u32);
|
||||
assert_eq!(
|
||||
ZSTDv07_getDecompressedSize(frame.as_ptr().cast(), frame.len()),
|
||||
payload.len() as u64
|
||||
);
|
||||
|
||||
let mut c_size = 0usize;
|
||||
let mut d_bound = 0u64;
|
||||
ZSTDv07_findFrameSizeInfoLegacy(
|
||||
frame.as_ptr().cast(),
|
||||
frame.len(),
|
||||
&mut c_size,
|
||||
&mut d_bound,
|
||||
);
|
||||
assert_eq!(c_size, frame.len());
|
||||
assert_eq!(d_bound, BLOCKSIZE as u64);
|
||||
|
||||
let mut output = [0u8; 32];
|
||||
let decoded = ZSTDv07_decompress(
|
||||
output.as_mut_ptr().cast(),
|
||||
output.len(),
|
||||
frame.as_ptr().cast(),
|
||||
frame.len(),
|
||||
);
|
||||
assert_eq!(decoded, payload.len());
|
||||
assert_eq!(&output[..decoded], payload);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn raw_frame_streaming_and_buffered_lifecycle() {
|
||||
let payload = b"stream-v07";
|
||||
let frame = raw_frame(payload);
|
||||
unsafe {
|
||||
let dctx = ZSTDv07_createDCtx();
|
||||
assert!(!dctx.is_null());
|
||||
let mut output = [0u8; 32];
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), 5);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(dctx, ptr::null_mut(), 0, frame.as_ptr().cast(), 5),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), 1);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
frame.as_ptr().add(5).cast(),
|
||||
1
|
||||
),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), 3);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
frame.as_ptr().add(6).cast(),
|
||||
3
|
||||
),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), payload.len());
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
output.as_mut_ptr().cast(),
|
||||
output.len(),
|
||||
frame.as_ptr().add(9).cast(),
|
||||
payload.len(),
|
||||
),
|
||||
payload.len()
|
||||
);
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), 3);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
frame.as_ptr().add(9 + payload.len()).cast(),
|
||||
3
|
||||
),
|
||||
0
|
||||
);
|
||||
assert_eq!(&output[..payload.len()], payload);
|
||||
assert_eq!(ZSTDv07_freeDCtx(dctx), 0);
|
||||
assert_eq!(ZSTDv07_freeDCtx(ptr::null_mut()), 0);
|
||||
|
||||
let bctx = ZBUFFv07_createDCtx();
|
||||
assert!(!bctx.is_null());
|
||||
assert_eq!(ZBUFFv07_decompressInit(bctx), 0);
|
||||
let mut buffered_output = [0u8; 32];
|
||||
let mut src_size = frame.len();
|
||||
let mut dst_size = buffered_output.len();
|
||||
let hint = ZBUFFv07_decompressContinue(
|
||||
bctx,
|
||||
buffered_output.as_mut_ptr().cast(),
|
||||
&mut dst_size,
|
||||
frame.as_ptr().cast(),
|
||||
&mut src_size,
|
||||
);
|
||||
assert_eq!(ZBUFFv07_isError(hint), 0);
|
||||
assert_eq!(src_size, frame.len());
|
||||
assert_eq!(dst_size, payload.len());
|
||||
assert_eq!(&buffered_output[..dst_size], payload);
|
||||
assert_eq!(ZBUFFv07_freeDCtx(bctx), 0);
|
||||
assert_eq!(ZBUFFv07_freeDCtx(ptr::null_mut()), 0);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn rle_frame_and_error_names() {
|
||||
let frame = rle_frame(b'R', 7);
|
||||
unsafe {
|
||||
let mut output = [0u8; 7];
|
||||
assert_eq!(
|
||||
ZSTDv07_decompress(
|
||||
output.as_mut_ptr().cast(),
|
||||
output.len(),
|
||||
frame.as_ptr().cast(),
|
||||
frame.len(),
|
||||
),
|
||||
output.len()
|
||||
);
|
||||
assert_eq!(&output, b"RRRRRRR");
|
||||
assert!(ZSTDv07_isError(ERROR(ZstdErrorCode::DstSizeTooSmall)) != 0);
|
||||
let name = CStr::from_ptr(ZSTDv07_getErrorName(ERROR(ZstdErrorCode::DstSizeTooSmall)));
|
||||
assert_eq!(name.to_bytes(), b"Destination buffer is too small");
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn compressed_frame_matches_v07_reference_encoder() {
|
||||
let frame: [u8; 92] = [
|
||||
0x27, 0xb5, 0x2f, 0xfd, 0xa4, 0x40, 0x0d, 0x03, 0x00, 0x00, 0x00, 0x42, 0xa0, 0x38,
|
||||
0x6c, 0x65, 0x67, 0x61, 0x63, 0x79, 0x20, 0x76, 0x30, 0x37, 0x20, 0x73, 0x65, 0x71,
|
||||
0x75, 0x65, 0x6e, 0x63, 0x65, 0x20, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x20,
|
||||
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
|
||||
0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x0a, 0x6c,
|
||||
0x01, 0x00, 0x58, 0xfc, 0xaf, 0x73, 0x05, 0x05, 0x00, 0x00, 0x08, 0x80, 0x01, 0x00,
|
||||
0x3d, 0x0d, 0xf2, 0x0b, 0x04, 0xd4, 0xe1, 0xcd,
|
||||
];
|
||||
let sample = b"legacy v07 sequence payload abcdefghijklmnopqrstuvwxyz\n";
|
||||
let mut expected = Vec::with_capacity(200_000);
|
||||
while expected.len() < 200_000 {
|
||||
expected.extend_from_slice(sample);
|
||||
}
|
||||
expected.truncate(200_000);
|
||||
let mut output = vec![0u8; expected.len()];
|
||||
unsafe {
|
||||
let decoded = ZSTDv07_decompress(
|
||||
output.as_mut_ptr().cast(),
|
||||
output.len(),
|
||||
frame.as_ptr().cast(),
|
||||
frame.len(),
|
||||
);
|
||||
assert_eq!(decoded, expected.len());
|
||||
}
|
||||
assert_eq!(output, expected);
|
||||
|
||||
unsafe {
|
||||
let bctx = ZBUFFv07_createDCtx();
|
||||
assert!(!bctx.is_null());
|
||||
assert_eq!(ZBUFFv07_decompressInit(bctx), 0);
|
||||
let mut buffered_output = vec![0u8; expected.len()];
|
||||
let mut src_size = frame.len();
|
||||
let mut dst_size = buffered_output.len();
|
||||
let hint = ZBUFFv07_decompressContinue(
|
||||
bctx,
|
||||
buffered_output.as_mut_ptr().cast(),
|
||||
&mut dst_size,
|
||||
frame.as_ptr().cast(),
|
||||
&mut src_size,
|
||||
);
|
||||
assert_eq!(ZBUFFv07_isError(hint), 0);
|
||||
assert_eq!(src_size, frame.len());
|
||||
assert_eq!(dst_size, expected.len());
|
||||
assert_eq!(buffered_output, expected);
|
||||
assert_eq!(ZBUFFv07_freeDCtx(bctx), 0);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn skippable_stream_consumes_payload_without_output() {
|
||||
let frame: [u8; 11] = [0x50, 0x2a, 0x4d, 0x18, 3, 0, 0, 0, 1, 2, 3];
|
||||
unsafe {
|
||||
let dctx = ZSTDv07_createDCtx();
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(dctx, ptr::null_mut(), 0, frame.as_ptr().cast(), 5),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_isSkipFrame(dctx), 0);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
frame.as_ptr().add(5).cast(),
|
||||
3
|
||||
),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_isSkipFrame(dctx), 1);
|
||||
assert_eq!(
|
||||
ZSTDv07_decompressContinue(
|
||||
dctx,
|
||||
ptr::null_mut(),
|
||||
0,
|
||||
frame.as_ptr().add(8).cast(),
|
||||
3
|
||||
),
|
||||
0
|
||||
);
|
||||
assert_eq!(ZSTDv07_nextSrcSizeToDecompress(dctx), 0);
|
||||
ZSTDv07_freeDCtx(dctx);
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user