ddidderr/zstd-rs
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

feat(compress): move raw and RLE block emitters to Rust

Browse Source 
Replace the shared C raw and one-byte RLE fallback block serializers with Rust ABI leaves. Preserve the zstd block headers, payload copies, capacity errors, and all existing C compressor dispatch and context ownership; share the raw serializer with the Rust one-shot path.

Test Plan:

- cargo test --manifest-path rust/Cargo.toml --no-default-features --features compression (208 tests)

- cargo clippy --manifest-path rust/Cargo.toml

- cargo clippy --manifest-path rust/Cargo.toml --benches

- cargo clippy --manifest-path rust/Cargo.toml --tests

- make -B -C lib -j2 lib
This commit is contained in:
ddidderr
2026-07-18 06:03:39 +02:00
parent 3599d223f9
commit 48eb895af3
4 changed files with 139 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/compress/zstd_compress.c
+9 -9
View File
@@ -2845,12 +2845,12 @@ ZSTD_compressSeqStore_singleBlock(ZSTD_CCtx* zc,
}
if (cSeqsSize == 0) {
cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
cSize = ZSTD_rust_noCompressBlock(op, dstCapacity, ip, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "Nocompress block failed");
DEBUGLOG(5, "Writing out nocompress block, size: %zu", cSize);
*dRep = dRepOriginal; /* reset simulated decompression repcode history */
} else if (cSeqsSize == 1) {
cSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, srcSize, lastBlock);
cSize = ZSTD_rust_rleCompressBlock(op, dstCapacity, *ip, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "RLE compress block failed");
DEBUGLOG(5, "Writing out RLE block, size: %zu", cSize);
*dRep = dRepOriginal; /* reset simulated decompression repcode history */
@@ -3062,7 +3062,7 @@ ZSTD_compressBlock_splitBlock(ZSTD_CCtx* zc,
if (zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
zc->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
RETURN_ERROR_IF(zc->seqCollector.collectSequences, sequenceProducer_failed, "Uncompressible block");
cSize = ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
cSize = ZSTD_rust_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
DEBUGLOG(5, "ZSTD_compressBlock_splitBlock: Nocompress block");
return cSize;
@@ -3158,7 +3158,7 @@ static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc,
ZSTD_maybeRLE(&zc->seqStore) &&
ZSTD_isRLE((BYTE const*)src, srcSize))
{
return ZSTD_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock);
return ZSTD_rust_rleCompressBlock(dst, dstCapacity, *(BYTE const*)src, srcSize, lastBlock);
}
/* Attempt superblock compression.
*
@@ -3196,7 +3196,7 @@ static size_t ZSTD_compressBlock_targetCBlockSize_body(ZSTD_CCtx* zc,
/* Superblock compression failed, attempt to emit a single no compress block.
* The decoder will be able to stream this block since it is uncompressed.
*/
return ZSTD_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
return ZSTD_rust_noCompressBlock(dst, dstCapacity, src, srcSize, lastBlock);
}
static size_t ZSTD_compressBlock_targetCBlockSize(ZSTD_CCtx* zc,
@@ -3320,7 +3320,7 @@ static size_t ZSTD_compress_frameChunk(ZSTD_CCtx* cctx,
FORWARD_IF_ERROR(cSize, "ZSTD_compressBlock_internal failed");
if (cSize == 0) { /* block is not compressible */
cSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
cSize = ZSTD_rust_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cSize, "ZSTD_noCompressBlock failed");
} else {
U32 const cBlockHeader = cSize == 1 ?
@@ -5630,7 +5630,7 @@ ZSTD_compressSequences_internal(ZSTD_CCtx* cctx,
/* TODO: See 3090. We reduced MIN_CBLOCK_SIZE from 3 to 2 so to compensate we are adding
* additional 1. We need to revisit and change this logic to be more consistent */
if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1+1) {
cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
cBlockSize = ZSTD_rust_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
DEBUGLOG(5, "Block too small (%zu): data remains uncompressed: cSize=%zu", blockSize, cBlockSize);
cSize += cBlockSize;
@@ -5664,11 +5664,11 @@ ZSTD_compressSequences_internal(ZSTD_CCtx* cctx,
if (compressedSeqsSize == 0) {
/* ZSTD_noCompressBlock writes the block header as well */
cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
cBlockSize = ZSTD_rust_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "ZSTD_noCompressBlock failed");
DEBUGLOG(5, "Writing out nocompress block, size: %zu", cBlockSize);
} else if (compressedSeqsSize == 1) {
cBlockSize = ZSTD_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock);
cBlockSize = ZSTD_rust_rleCompressBlock(op, dstCapacity, *ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "ZSTD_rleCompressBlock failed");
DEBUGLOG(5, "Writing out RLE block, size: %zu", cBlockSize);
} else {
lib/compress/zstd_compress_internal.h
+5 -25
View File
@@ -649,31 +649,11 @@ ZSTD_selectAddr(U32 index, U32 lowLimit, const BYTE* candidate, const BYTE* back
#endif
}
/* ZSTD_noCompressBlock() :
* Writes uncompressed block to dst buffer from given src.
* Returns the size of the block */
MEM_STATIC size_t
ZSTD_noCompressBlock(void* dst, size_t dstCapacity, const void* src, size_t srcSize, U32 lastBlock)
{
U32 const cBlockHeader24 = lastBlock + (((U32)bt_raw)<<1) + (U32)(srcSize << 3);
DEBUGLOG(5, "ZSTD_noCompressBlock (srcSize=%zu, dstCapacity=%zu)", srcSize, dstCapacity);
RETURN_ERROR_IF(srcSize + ZSTD_blockHeaderSize > dstCapacity,
dstSize_tooSmall, "dst buf too small for uncompressed block");
MEM_writeLE24(dst, cBlockHeader24);
ZSTD_memcpy((BYTE*)dst + ZSTD_blockHeaderSize, src, srcSize);
return ZSTD_blockHeaderSize + srcSize;
}
MEM_STATIC size_t
ZSTD_rleCompressBlock(void* dst, size_t dstCapacity, BYTE src, size_t srcSize, U32 lastBlock)
{
BYTE* const op = (BYTE*)dst;
U32 const cBlockHeader = lastBlock + (((U32)bt_rle)<<1) + (U32)(srcSize << 3);
RETURN_ERROR_IF(dstCapacity < 4, dstSize_tooSmall, "");
MEM_writeLE24(op, cBlockHeader);
op[3] = src;
return 4;
}
/* The raw and RLE block serializers live in Rust. */
size_t ZSTD_rust_noCompressBlock(void* dst, size_t dstCapacity,
const void* src, size_t srcSize, U32 lastBlock);
size_t ZSTD_rust_rleCompressBlock(void* dst, size_t dstCapacity, BYTE src,
size_t srcSize, U32 lastBlock);
/* ZSTD_minGain() :