feat(rust): port compression-parameter selection
Move the context-free compression-parameter logic of zstd_compress.c to rust/src/zstd_compress_params.rs: the compression-level tables (formerly clevels.h), parameter bounds/checking/clamping, cycle log, level-table selection, source/dictionary parameter adjustment, default frame parameters, and the match-state/CDict size estimators. The boundary follows the module's design notes: Rust owns only leaves whose behavior is independent of C preprocessor configuration. C keeps the public ZSTD_* symbols and feeds the leaves everything that is configuration-owned as explicit scalars: - The ZSTD_EXCLUDE_*_BLOCK_COMPRESSOR strategy cascade stays in ZSTD_adjustCParams_internal() ahead of the Rust adjustment leaf, so reduced builds keep their fallback policy. - Workspace estimation receives struct sizes (ZSTD_CDict, ZSTD_match_t, ZSTD_optimal_t), HUF workspace size, and the sanitizer redzone size, because those depend on private layouts and ASAN configuration. - ZSTD_cParam_getBounds() forwards only the compression level and the seven core parameters; all other parameter bounds remain C. - Frozen private constants the leaves hardcode (short-cache and row-hash tag widths, MaxML/MaxLL/MaxOff/Litbits, ZSTD_OPT_SIZE, cwksp alignment) are pinned by ZSTD_STATIC_ASSERTs at the C call sites. Two latent 32-bit bugs in the previously unwired module were fixed before integration: dictAndWindowLog's max window size and the window-resize threshold were hardcoded to the 64-bit constants (1<<31, 1<<30) instead of deriving from ZSTD_WINDOWLOG_MAX, which is 30 on 32-bit targets. clevels.h is no longer included anywhere but stays in-tree as the reference for mechanical comparison against the Rust table. Test plan: - cd rust && cargo fmt --check && cargo clippy --all-targets -- -D warnings && cargo test --all-targets (125 tests) - make -C tests fuzzer && ./tests/fuzzer -i1 --no-big-tests - make -C tests test-rust-lib-smoke - Byte-identity: zstd CLI frames for COPYING, a 250 KB C source, and a 5 MB datagen sample at levels 1/3/9/19/--fast=5 are identical between this change and its parent commit.
This commit is contained in:
+106
-271
@@ -38,6 +38,62 @@ size_t ZSTD_rust_writeFrameHeader(void* dst, size_t dstCapacity,
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U32 windowLog, U64 pledgedSrcSize,
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U32 dictID);
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/* Context-free compression-parameter selection and sizing leaves live in
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* Rust (rust/src/zstd_compress_params.rs). This file retains
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* configuration-sensitive policy: the excluded-block-compressor strategy
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* cascade, private ZSTD_CCtx_params handling, and sanitizer workspace
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* policy, which it feeds to the leaves as explicit scalar inputs. The
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* ZSTD_CParamMode_e and ZSTD_ParamSwitch_e enums are passed as int; the
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* Rust side mirrors their values. */
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int ZSTD_rust_params_maxCLevel(void);
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int ZSTD_rust_params_minCLevel(void);
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int ZSTD_rust_params_defaultCLevel(void);
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ZSTD_bounds ZSTD_rust_params_getBounds(int param);
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size_t ZSTD_rust_params_checkCParams(ZSTD_compressionParameters cParams);
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ZSTD_compressionParameters
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ZSTD_rust_params_clampCParams(ZSTD_compressionParameters cParams);
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U32 ZSTD_rust_params_cycleLog(U32 hashLog, int strategy);
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ZSTD_compressionParameters
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ZSTD_rust_params_selectCParams(int compressionLevel, U64 srcSizeHint,
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size_t dictSize, int mode);
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ZSTD_compressionParameters
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ZSTD_rust_params_adjustCParams(ZSTD_compressionParameters cParams, U64 srcSize,
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size_t dictSize, int mode,
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int useRowMatchFinder);
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ZSTD_parameters ZSTD_rust_params_makeParams(ZSTD_compressionParameters cParams);
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size_t ZSTD_rust_params_maxNbSeq(size_t blockSize, U32 minMatch,
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int useSequenceProducer);
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size_t ZSTD_rust_params_resolveMaxBlockSize(size_t maxBlockSize);
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typedef struct {
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U32 hashLog3Max;
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size_t matchTSize;
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size_t optimalTSize;
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size_t asanRedzoneSize;
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} ZSTD_rustMatchStateSizing;
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size_t ZSTD_rust_params_estimateMatchStateSize(
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ZSTD_compressionParameters cParams, int useRowMatchFinder,
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int enableDedicatedDictSearch, U32 forCCtx,
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const ZSTD_rustMatchStateSizing* sizing);
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typedef struct {
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size_t cdictSize;
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size_t hufWorkspaceSize;
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U32 hashLog3Max;
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size_t matchTSize;
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size_t optimalTSize;
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size_t asanRedzoneSize;
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} ZSTD_rustCDictSizing;
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size_t ZSTD_rust_params_estimateCDictSizeFromCParams(
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size_t dictSize, ZSTD_compressionParameters cParams,
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int dictLoadMethod, const ZSTD_rustCDictSizing* sizing);
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#if ZSTD_ADDRESS_SANITIZER && !defined (ZSTD_ASAN_DONT_POISON_WORKSPACE)
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# define ZSTD_RUST_ASAN_REDZONE_SIZE ((size_t)ZSTD_CWKSP_ASAN_REDZONE_SIZE)
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#else
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# define ZSTD_RUST_ASAN_REDZONE_SIZE ((size_t)0)
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#endif
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/* ***************************************************************
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* Tuning parameters
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*****************************************************************/
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@@ -276,11 +332,7 @@ static int ZSTD_resolveExternalSequenceValidation(int mode) {
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/* Resolves maxBlockSize to the default if no value is present. */
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static size_t ZSTD_resolveMaxBlockSize(size_t maxBlockSize) {
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if (maxBlockSize == 0) {
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return ZSTD_BLOCKSIZE_MAX;
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} else {
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return maxBlockSize;
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}
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return ZSTD_rust_params_resolveMaxBlockSize(maxBlockSize);
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}
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static ZSTD_ParamSwitch_e ZSTD_resolveExternalRepcodeSearch(ZSTD_ParamSwitch_e value, int cLevel) {
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@@ -420,45 +472,17 @@ ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
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switch(param)
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{
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/* The compression level and the seven core compression parameters are
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* bounded by the Rust leaf. */
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case ZSTD_c_compressionLevel:
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bounds.lowerBound = ZSTD_minCLevel();
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bounds.upperBound = ZSTD_maxCLevel();
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return bounds;
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case ZSTD_c_windowLog:
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bounds.lowerBound = ZSTD_WINDOWLOG_MIN;
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bounds.upperBound = ZSTD_WINDOWLOG_MAX;
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return bounds;
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case ZSTD_c_hashLog:
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bounds.lowerBound = ZSTD_HASHLOG_MIN;
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bounds.upperBound = ZSTD_HASHLOG_MAX;
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return bounds;
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case ZSTD_c_chainLog:
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bounds.lowerBound = ZSTD_CHAINLOG_MIN;
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bounds.upperBound = ZSTD_CHAINLOG_MAX;
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return bounds;
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case ZSTD_c_searchLog:
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bounds.lowerBound = ZSTD_SEARCHLOG_MIN;
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bounds.upperBound = ZSTD_SEARCHLOG_MAX;
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return bounds;
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case ZSTD_c_minMatch:
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bounds.lowerBound = ZSTD_MINMATCH_MIN;
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bounds.upperBound = ZSTD_MINMATCH_MAX;
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return bounds;
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case ZSTD_c_targetLength:
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bounds.lowerBound = ZSTD_TARGETLENGTH_MIN;
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bounds.upperBound = ZSTD_TARGETLENGTH_MAX;
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return bounds;
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case ZSTD_c_strategy:
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bounds.lowerBound = ZSTD_STRATEGY_MIN;
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bounds.upperBound = ZSTD_STRATEGY_MAX;
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return bounds;
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return ZSTD_rust_params_getBounds((int)param);
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case ZSTD_c_contentSizeFlag:
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bounds.lowerBound = 0;
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@@ -1385,14 +1409,7 @@ size_t ZSTD_CCtx_reset(ZSTD_CCtx* cctx, ZSTD_ResetDirective reset)
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@return : 0, or an error code if one value is beyond authorized range */
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size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
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{
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BOUNDCHECK(ZSTD_c_windowLog, (int)cParams.windowLog);
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BOUNDCHECK(ZSTD_c_chainLog, (int)cParams.chainLog);
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BOUNDCHECK(ZSTD_c_hashLog, (int)cParams.hashLog);
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BOUNDCHECK(ZSTD_c_searchLog, (int)cParams.searchLog);
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BOUNDCHECK(ZSTD_c_minMatch, (int)cParams.minMatch);
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BOUNDCHECK(ZSTD_c_targetLength,(int)cParams.targetLength);
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BOUNDCHECK(ZSTD_c_strategy, (int)cParams.strategy);
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return 0;
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return ZSTD_rust_params_checkCParams(cParams);
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}
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/** ZSTD_clampCParams() :
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@@ -1401,63 +1418,14 @@ size_t ZSTD_checkCParams(ZSTD_compressionParameters cParams)
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static ZSTD_compressionParameters
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ZSTD_clampCParams(ZSTD_compressionParameters cParams)
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{
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# define CLAMP_TYPE(cParam, val, type) \
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do { \
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ZSTD_bounds const bounds = ZSTD_cParam_getBounds(cParam); \
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if ((int)val<bounds.lowerBound) val=(type)bounds.lowerBound; \
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else if ((int)val>bounds.upperBound) val=(type)bounds.upperBound; \
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} while (0)
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# define CLAMP(cParam, val) CLAMP_TYPE(cParam, val, unsigned)
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CLAMP(ZSTD_c_windowLog, cParams.windowLog);
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CLAMP(ZSTD_c_chainLog, cParams.chainLog);
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CLAMP(ZSTD_c_hashLog, cParams.hashLog);
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CLAMP(ZSTD_c_searchLog, cParams.searchLog);
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CLAMP(ZSTD_c_minMatch, cParams.minMatch);
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CLAMP(ZSTD_c_targetLength,cParams.targetLength);
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CLAMP_TYPE(ZSTD_c_strategy,cParams.strategy, ZSTD_strategy);
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return cParams;
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return ZSTD_rust_params_clampCParams(cParams);
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}
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/** ZSTD_cycleLog() :
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* condition for correct operation : hashLog > 1 */
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U32 ZSTD_cycleLog(U32 hashLog, ZSTD_strategy strat)
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{
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U32 const btScale = ((U32)strat >= (U32)ZSTD_btlazy2);
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return hashLog - btScale;
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}
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/** ZSTD_dictAndWindowLog() :
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* Returns an adjusted window log that is large enough to fit the source and the dictionary.
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* The zstd format says that the entire dictionary is valid if one byte of the dictionary
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* is within the window. So the hashLog and chainLog should be large enough to reference both
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* the dictionary and the window. So we must use this adjusted dictAndWindowLog when downsizing
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* the hashLog and windowLog.
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* NOTE: srcSize must not be ZSTD_CONTENTSIZE_UNKNOWN.
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*/
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static U32 ZSTD_dictAndWindowLog(U32 windowLog, U64 srcSize, U64 dictSize)
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{
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const U64 maxWindowSize = 1ULL << ZSTD_WINDOWLOG_MAX;
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/* No dictionary ==> No change */
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if (dictSize == 0) {
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return windowLog;
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}
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assert(windowLog <= ZSTD_WINDOWLOG_MAX);
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assert(srcSize != ZSTD_CONTENTSIZE_UNKNOWN); /* Handled in ZSTD_adjustCParams_internal() */
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{
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U64 const windowSize = 1ULL << windowLog;
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U64 const dictAndWindowSize = dictSize + windowSize;
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/* If the window size is already large enough to fit both the source and the dictionary
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* then just use the window size. Otherwise adjust so that it fits the dictionary and
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* the window.
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*/
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if (windowSize >= dictSize + srcSize) {
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return windowLog; /* Window size large enough already */
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} else if (dictAndWindowSize >= maxWindowSize) {
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return ZSTD_WINDOWLOG_MAX; /* Larger than max window log */
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} else {
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return ZSTD_highbit32((U32)dictAndWindowSize - 1) + 1;
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}
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}
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return ZSTD_rust_params_cycleLog(hashLog, (int)strat);
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}
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/** ZSTD_adjustCParams_internal() :
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@@ -1474,8 +1442,6 @@ ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
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ZSTD_CParamMode_e mode,
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ZSTD_ParamSwitch_e useRowMatchFinder)
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{
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const U64 minSrcSize = 513; /* (1<<9) + 1 */
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const U64 maxWindowResize = 1ULL << (ZSTD_WINDOWLOG_MAX-1);
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assert(ZSTD_checkCParams(cPar)==0);
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/* Cascade the selected strategy down to the next-highest one built into
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@@ -1520,90 +1486,13 @@ ZSTD_adjustCParams_internal(ZSTD_compressionParameters cPar,
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}
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#endif
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switch (mode) {
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case ZSTD_cpm_unknown:
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case ZSTD_cpm_noAttachDict:
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/* If we don't know the source size, don't make any
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* assumptions about it. We will already have selected
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* smaller parameters if a dictionary is in use.
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*/
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break;
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case ZSTD_cpm_createCDict:
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/* Assume a small source size when creating a dictionary
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* with an unknown source size.
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*/
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if (dictSize && srcSize == ZSTD_CONTENTSIZE_UNKNOWN)
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srcSize = minSrcSize;
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break;
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case ZSTD_cpm_attachDict:
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/* Dictionary has its own dedicated parameters which have
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* already been selected. We are selecting parameters
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* for only the source.
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*/
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dictSize = 0;
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break;
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default:
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assert(0);
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break;
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}
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/* resize windowLog if input is small enough, to use less memory */
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if ( (srcSize <= maxWindowResize)
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&& (dictSize <= maxWindowResize) ) {
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U32 const tSize = (U32)(srcSize + dictSize);
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static U32 const hashSizeMin = 1 << ZSTD_HASHLOG_MIN;
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U32 const srcLog = (tSize < hashSizeMin) ? ZSTD_HASHLOG_MIN :
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ZSTD_highbit32(tSize-1) + 1;
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if (cPar.windowLog > srcLog) cPar.windowLog = srcLog;
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}
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if (srcSize != ZSTD_CONTENTSIZE_UNKNOWN) {
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U32 const dictAndWindowLog = ZSTD_dictAndWindowLog(cPar.windowLog, (U64)srcSize, (U64)dictSize);
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U32 const cycleLog = ZSTD_cycleLog(cPar.chainLog, cPar.strategy);
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if (cPar.hashLog > dictAndWindowLog+1) cPar.hashLog = dictAndWindowLog+1;
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if (cycleLog > dictAndWindowLog)
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cPar.chainLog -= (cycleLog - dictAndWindowLog);
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}
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if (cPar.windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN)
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cPar.windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* minimum wlog required for valid frame header */
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/* We can't use more than 32 bits of hash in total, so that means that we require:
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* (hashLog + 8) <= 32 && (chainLog + 8) <= 32
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*/
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if (mode == ZSTD_cpm_createCDict && ZSTD_CDictIndicesAreTagged(&cPar)) {
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U32 const maxShortCacheHashLog = 32 - ZSTD_SHORT_CACHE_TAG_BITS;
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if (cPar.hashLog > maxShortCacheHashLog) {
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cPar.hashLog = maxShortCacheHashLog;
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}
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if (cPar.chainLog > maxShortCacheHashLog) {
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cPar.chainLog = maxShortCacheHashLog;
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}
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}
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/* At this point, we aren't 100% sure if we are using the row match finder.
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* Unless it is explicitly disabled, conservatively assume that it is enabled.
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* In this case it will only be disabled for small sources, so shrinking the
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* hash log a little bit shouldn't result in any ratio loss.
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*/
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if (useRowMatchFinder == ZSTD_ps_auto)
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useRowMatchFinder = ZSTD_ps_enable;
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/* We can't hash more than 32-bits in total. So that means that we require:
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* (hashLog - rowLog + 8) <= 32
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*/
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if (ZSTD_rowMatchFinderUsed(cPar.strategy, useRowMatchFinder)) {
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/* Switch to 32-entry rows if searchLog is 5 (or more) */
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U32 const rowLog = BOUNDED(4, cPar.searchLog, 6);
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U32 const maxRowHashLog = 32 - ZSTD_ROW_HASH_TAG_BITS;
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U32 const maxHashLog = maxRowHashLog + rowLog;
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assert(cPar.hashLog >= rowLog);
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if (cPar.hashLog > maxHashLog) {
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cPar.hashLog = maxHashLog;
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}
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}
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return cPar;
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/* The remaining adjustment logic is context-free and lives in Rust. The
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* short-cache and row-hash tag widths the leaf assumes are fixed
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* private-header constants; keep them checked here. */
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ZSTD_STATIC_ASSERT(ZSTD_SHORT_CACHE_TAG_BITS == 8);
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ZSTD_STATIC_ASSERT(ZSTD_ROW_HASH_TAG_BITS == 8);
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return ZSTD_rust_params_adjustCParams(cPar, (U64)srcSize, dictSize,
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(int)mode, (int)useRowMatchFinder);
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}
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ZSTD_compressionParameters
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@@ -1654,47 +1543,31 @@ ZSTD_sizeof_matchState(const ZSTD_compressionParameters* const cParams,
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const int enableDedicatedDictSearch,
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const U32 forCCtx)
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{
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/* chain table size should be 0 for fast or row-hash strategies */
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size_t const chainSize = ZSTD_allocateChainTable(cParams->strategy, useRowMatchFinder, enableDedicatedDictSearch && !forCCtx)
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? ((size_t)1 << cParams->chainLog)
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: 0;
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size_t const hSize = ((size_t)1) << cParams->hashLog;
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U32 const hashLog3 = (forCCtx && cParams->minMatch==3) ? MIN(ZSTD_HASHLOG3_MAX, cParams->windowLog) : 0;
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size_t const h3Size = hashLog3 ? ((size_t)1) << hashLog3 : 0;
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/* We don't use ZSTD_cwksp_alloc_size() here because the tables aren't
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* surrounded by redzones in ASAN. */
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size_t const tableSpace = chainSize * sizeof(U32)
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+ hSize * sizeof(U32)
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+ h3Size * sizeof(U32);
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size_t const optPotentialSpace =
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ZSTD_cwksp_aligned64_alloc_size((MaxML+1) * sizeof(U32))
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+ ZSTD_cwksp_aligned64_alloc_size((MaxLL+1) * sizeof(U32))
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+ ZSTD_cwksp_aligned64_alloc_size((MaxOff+1) * sizeof(U32))
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+ ZSTD_cwksp_aligned64_alloc_size((1<<Litbits) * sizeof(U32))
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+ ZSTD_cwksp_aligned64_alloc_size(ZSTD_OPT_SIZE * sizeof(ZSTD_match_t))
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+ ZSTD_cwksp_aligned64_alloc_size(ZSTD_OPT_SIZE * sizeof(ZSTD_optimal_t));
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size_t const lazyAdditionalSpace = ZSTD_rowMatchFinderUsed(cParams->strategy, useRowMatchFinder)
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? ZSTD_cwksp_aligned64_alloc_size(hSize)
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: 0;
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size_t const optSpace = (forCCtx && (cParams->strategy >= ZSTD_btopt))
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? optPotentialSpace
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: 0;
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size_t const slackSpace = ZSTD_cwksp_slack_space_required();
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ZSTD_rustMatchStateSizing sizing;
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sizing.hashLog3Max = ZSTD_HASHLOG3_MAX;
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sizing.matchTSize = sizeof(ZSTD_match_t);
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sizing.optimalTSize = sizeof(ZSTD_optimal_t);
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sizing.asanRedzoneSize = ZSTD_RUST_ASAN_REDZONE_SIZE;
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/* The Rust leaf hardcodes the frozen format bounds and workspace rules;
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* keep them checked against the private headers here. */
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ZSTD_STATIC_ASSERT(MaxML == 52 && MaxLL == 35 && MaxOff == 31);
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ZSTD_STATIC_ASSERT(Litbits == 8 && ZSTD_OPT_SIZE == 4099);
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ZSTD_STATIC_ASSERT(ZSTD_CWKSP_ALIGNMENT_BYTES == 64);
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/* tables are guaranteed to be sized in multiples of 64 bytes (or 16 uint32_t) */
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ZSTD_STATIC_ASSERT(ZSTD_HASHLOG_MIN >= 4 && ZSTD_WINDOWLOG_MIN >= 4 && ZSTD_CHAINLOG_MIN >= 4);
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assert(useRowMatchFinder != ZSTD_ps_auto);
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DEBUGLOG(4, "chainSize: %u - hSize: %u - h3Size: %u",
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(U32)chainSize, (U32)hSize, (U32)h3Size);
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return tableSpace + optSpace + slackSpace + lazyAdditionalSpace;
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return ZSTD_rust_params_estimateMatchStateSize(*cParams,
|
||||
(int)useRowMatchFinder,
|
||||
enableDedicatedDictSearch,
|
||||
forCCtx, &sizing);
|
||||
}
|
||||
|
||||
/* Helper function for calculating memory requirements.
|
||||
* Gives a tighter bound than ZSTD_sequenceBound() by taking minMatch into account. */
|
||||
static size_t ZSTD_maxNbSeq(size_t blockSize, unsigned minMatch, int useSequenceProducer) {
|
||||
U32 const divider = (minMatch==3 || useSequenceProducer) ? 3 : 4;
|
||||
return blockSize / divider;
|
||||
return ZSTD_rust_params_maxNbSeq(blockSize, minMatch, useSequenceProducer);
|
||||
}
|
||||
|
||||
static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
|
||||
@@ -5430,15 +5303,15 @@ size_t ZSTD_estimateCDictSize_advanced(
|
||||
size_t dictSize, ZSTD_compressionParameters cParams,
|
||||
ZSTD_dictLoadMethod_e dictLoadMethod)
|
||||
{
|
||||
DEBUGLOG(5, "sizeof(ZSTD_CDict) : %u", (unsigned)sizeof(ZSTD_CDict));
|
||||
return ZSTD_cwksp_alloc_size(sizeof(ZSTD_CDict))
|
||||
+ ZSTD_cwksp_alloc_size(HUF_WORKSPACE_SIZE)
|
||||
/* enableDedicatedDictSearch == 1 ensures that CDict estimation will not be too small
|
||||
* in case we are using DDS with row-hash. */
|
||||
+ ZSTD_sizeof_matchState(&cParams, ZSTD_resolveRowMatchFinderMode(ZSTD_ps_auto, &cParams),
|
||||
/* enableDedicatedDictSearch */ 1, /* forCCtx */ 0)
|
||||
+ (dictLoadMethod == ZSTD_dlm_byRef ? 0
|
||||
: ZSTD_cwksp_alloc_size(ZSTD_cwksp_align(dictSize, sizeof(void *))));
|
||||
ZSTD_rustCDictSizing sizing;
|
||||
sizing.cdictSize = sizeof(ZSTD_CDict);
|
||||
sizing.hufWorkspaceSize = HUF_WORKSPACE_SIZE;
|
||||
sizing.hashLog3Max = ZSTD_HASHLOG3_MAX;
|
||||
sizing.matchTSize = sizeof(ZSTD_match_t);
|
||||
sizing.optimalTSize = sizeof(ZSTD_optimal_t);
|
||||
sizing.asanRedzoneSize = ZSTD_RUST_ASAN_REDZONE_SIZE;
|
||||
return ZSTD_rust_params_estimateCDictSizeFromCParams(
|
||||
dictSize, cParams, (int)dictLoadMethod, &sizing);
|
||||
}
|
||||
|
||||
size_t ZSTD_estimateCDictSize(size_t dictSize, int compressionLevel)
|
||||
@@ -7576,11 +7449,12 @@ size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
|
||||
|
||||
|
||||
/*-===== Pre-defined compression levels =====-*/
|
||||
#include "clevels.h"
|
||||
/* The compression-level tables (formerly included from clevels.h) live in
|
||||
* rust/src/zstd_compress_params.rs. */
|
||||
|
||||
int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
|
||||
int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
|
||||
int ZSTD_defaultCLevel(void) { return ZSTD_CLEVEL_DEFAULT; }
|
||||
int ZSTD_maxCLevel(void) { return ZSTD_rust_params_maxCLevel(); }
|
||||
int ZSTD_minCLevel(void) { return ZSTD_rust_params_minCLevel(); }
|
||||
int ZSTD_defaultCLevel(void) { return ZSTD_rust_params_defaultCLevel(); }
|
||||
|
||||
static ZSTD_compressionParameters ZSTD_dedicatedDictSearch_getCParams(int const compressionLevel, size_t const dictSize)
|
||||
{
|
||||
@@ -7639,26 +7513,6 @@ static void ZSTD_dedicatedDictSearch_revertCParams(
|
||||
}
|
||||
}
|
||||
|
||||
static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_CParamMode_e mode)
|
||||
{
|
||||
switch (mode) {
|
||||
case ZSTD_cpm_unknown:
|
||||
case ZSTD_cpm_noAttachDict:
|
||||
case ZSTD_cpm_createCDict:
|
||||
break;
|
||||
case ZSTD_cpm_attachDict:
|
||||
dictSize = 0;
|
||||
break;
|
||||
default:
|
||||
assert(0);
|
||||
break;
|
||||
}
|
||||
{ int const unknown = srcSizeHint == ZSTD_CONTENTSIZE_UNKNOWN;
|
||||
size_t const addedSize = unknown && dictSize > 0 ? 500 : 0;
|
||||
return unknown && dictSize == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : srcSizeHint+dictSize+addedSize;
|
||||
}
|
||||
}
|
||||
|
||||
/*! ZSTD_getCParams_internal() :
|
||||
* @return ZSTD_compressionParameters structure for a selected compression level, srcSize and dictSize.
|
||||
* Note: srcSizeHint 0 means 0, use ZSTD_CONTENTSIZE_UNKNOWN for unknown.
|
||||
@@ -7666,27 +7520,12 @@ static U64 ZSTD_getCParamRowSize(U64 srcSizeHint, size_t dictSize, ZSTD_CParamMo
|
||||
* Note: `mode` controls how we treat the `dictSize`. See docs for `ZSTD_CParamMode_e`. */
|
||||
static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_CParamMode_e mode)
|
||||
{
|
||||
U64 const rSize = ZSTD_getCParamRowSize(srcSizeHint, dictSize, mode);
|
||||
U32 const tableID = (rSize <= 256 KB) + (rSize <= 128 KB) + (rSize <= 16 KB);
|
||||
int row;
|
||||
DEBUGLOG(5, "ZSTD_getCParams_internal (cLevel=%i)", compressionLevel);
|
||||
|
||||
/* row */
|
||||
if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT; /* 0 == default */
|
||||
else if (compressionLevel < 0) row = 0; /* entry 0 is baseline for fast mode */
|
||||
else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
|
||||
else row = compressionLevel;
|
||||
|
||||
{ ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
|
||||
DEBUGLOG(5, "ZSTD_getCParams_internal selected tableID: %u row: %u strat: %u", tableID, row, (U32)cp.strategy);
|
||||
/* acceleration factor */
|
||||
if (compressionLevel < 0) {
|
||||
int const clampedCompressionLevel = MAX(ZSTD_minCLevel(), compressionLevel);
|
||||
cp.targetLength = (unsigned)(-clampedCompressionLevel);
|
||||
}
|
||||
/* refine parameters based on srcSize & dictSize */
|
||||
return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode, ZSTD_ps_auto);
|
||||
}
|
||||
/* Table selection is context-free and lives in Rust; the adjustment step
|
||||
* stays behind ZSTD_adjustCParams_internal() so this build's strategy
|
||||
* cascade applies. */
|
||||
ZSTD_compressionParameters const cp = ZSTD_rust_params_selectCParams(
|
||||
compressionLevel, srcSizeHint, dictSize, (int)mode);
|
||||
return ZSTD_adjustCParams_internal(cp, srcSizeHint, dictSize, mode, ZSTD_ps_auto);
|
||||
}
|
||||
|
||||
/*! ZSTD_getCParams() :
|
||||
@@ -7705,13 +7544,9 @@ ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long l
|
||||
static ZSTD_parameters
|
||||
ZSTD_getParams_internal(int compressionLevel, unsigned long long srcSizeHint, size_t dictSize, ZSTD_CParamMode_e mode)
|
||||
{
|
||||
ZSTD_parameters params;
|
||||
ZSTD_compressionParameters const cParams = ZSTD_getCParams_internal(compressionLevel, srcSizeHint, dictSize, mode);
|
||||
DEBUGLOG(5, "ZSTD_getParams (cLevel=%i)", compressionLevel);
|
||||
ZSTD_memset(¶ms, 0, sizeof(params));
|
||||
params.cParams = cParams;
|
||||
params.fParams.contentSizeFlag = 1;
|
||||
return params;
|
||||
return ZSTD_rust_params_makeParams(cParams);
|
||||
}
|
||||
|
||||
/*! ZSTD_getParams() :
|
||||
|
||||
@@ -34,6 +34,12 @@ zstd ABI:
|
||||
- `zstd_compress_frame` serializes frame headers, skippable frames, and the
|
||||
last empty block; it takes scalar frame parameters so the C-owned
|
||||
`ZSTD_CCtx_params` layout never crosses the language boundary.
|
||||
- `zstd_compress_params` owns the compression-level tables (formerly
|
||||
`clevels.h`), parameter bounds, clamping, validation, table selection,
|
||||
source/dictionary adjustment, and match-state/CDict size estimation.
|
||||
The C integration layer keeps the public `ZSTD_*` symbols and feeds the
|
||||
leaves configuration-owned scalars: the excluded-block-compressor
|
||||
strategy cascade, struct sizes, and sanitizer redzone policy.
|
||||
- `zstd_fast` and `zstd_double_fast` implement the single- and two-table
|
||||
fast block match finders, including attached and external dictionary paths.
|
||||
- `zstd_lazy` implements greedy, lazy, lazy2, and binary-tree matching,
|
||||
|
||||
@@ -28,6 +28,8 @@ pub mod zstd_compress_frame;
|
||||
#[cfg(feature = "compression")]
|
||||
pub mod zstd_compress_literals;
|
||||
#[cfg(feature = "compression")]
|
||||
pub mod zstd_compress_params;
|
||||
#[cfg(feature = "compression")]
|
||||
pub mod zstd_compress_sequences;
|
||||
#[cfg(feature = "compression")]
|
||||
pub mod zstd_compress_superblock;
|
||||
|
||||
@@ -0,0 +1,1048 @@
|
||||
#![allow(non_camel_case_types)]
|
||||
#![allow(non_snake_case)]
|
||||
#![allow(clippy::missing_safety_doc)]
|
||||
#![allow(clippy::too_many_arguments)]
|
||||
|
||||
//! Context-free compression-parameter selection and sizing leaves.
|
||||
//!
|
||||
//! This module deliberately does **not** own the public `ZSTD_*` symbols yet.
|
||||
//! `zstd_compress.c` still owns configuration-sensitive policy: excluded block
|
||||
//! compressors, private `ZSTD_CCtx_params` layouts, LDM workspace sizing, and
|
||||
//! ASAN workspace policy. The C integration layer can select a raw table
|
||||
//! entry here, apply its configured strategy cascade, then use the adjustment
|
||||
//! and sizing leaves below. That keeps the Rust implementation independent of
|
||||
//! C preprocessor state while retaining byte-for-byte C policy for reduced
|
||||
//! builds.
|
||||
|
||||
use crate::errors::{ZstdErrorCode, ERROR};
|
||||
use std::mem::size_of;
|
||||
use std::os::raw::c_int;
|
||||
|
||||
pub const ZSTD_CONTENTSIZE_UNKNOWN: u64 = u64::MAX;
|
||||
|
||||
const ZSTD_CLEVEL_DEFAULT: c_int = 3;
|
||||
const ZSTD_MAX_CLEVEL: c_int = 22;
|
||||
const ZSTD_TARGETLENGTH_MAX: c_int = 1 << 17;
|
||||
const ZSTD_BLOCKSIZE_MAX: usize = 1 << 17;
|
||||
|
||||
const ZSTD_WINDOWLOG_MIN: c_int = 10;
|
||||
#[cfg(target_pointer_width = "32")]
|
||||
const ZSTD_WINDOWLOG_MAX: c_int = 30;
|
||||
#[cfg(not(target_pointer_width = "32"))]
|
||||
const ZSTD_WINDOWLOG_MAX: c_int = 31;
|
||||
const ZSTD_HASHLOG_MIN: c_int = 6;
|
||||
const ZSTD_HASHLOG_MAX: c_int = 30;
|
||||
const ZSTD_CHAINLOG_MIN: c_int = ZSTD_HASHLOG_MIN;
|
||||
#[cfg(target_pointer_width = "32")]
|
||||
const ZSTD_CHAINLOG_MAX: c_int = 29;
|
||||
#[cfg(not(target_pointer_width = "32"))]
|
||||
const ZSTD_CHAINLOG_MAX: c_int = 30;
|
||||
const ZSTD_SEARCHLOG_MIN: c_int = 1;
|
||||
const ZSTD_SEARCHLOG_MAX: c_int = ZSTD_WINDOWLOG_MAX - 1;
|
||||
const ZSTD_MINMATCH_MIN: c_int = 3;
|
||||
const ZSTD_MINMATCH_MAX: c_int = 7;
|
||||
const ZSTD_TARGETLENGTH_MIN: c_int = 0;
|
||||
|
||||
const ZSTD_FAST: c_int = 1;
|
||||
const ZSTD_DFAST: c_int = 2;
|
||||
const ZSTD_GREEDY: c_int = 3;
|
||||
const ZSTD_LAZY: c_int = 4;
|
||||
const ZSTD_LAZY2: c_int = 5;
|
||||
const ZSTD_BTLAZY2: c_int = 6;
|
||||
const ZSTD_BTOPT: c_int = 7;
|
||||
const ZSTD_BTULTRA: c_int = 8;
|
||||
const ZSTD_BTULTRA2: c_int = 9;
|
||||
|
||||
const ZSTD_C_COMPRESSION_LEVEL: c_int = 100;
|
||||
const ZSTD_C_WINDOW_LOG: c_int = 101;
|
||||
const ZSTD_C_HASH_LOG: c_int = 102;
|
||||
const ZSTD_C_CHAIN_LOG: c_int = 103;
|
||||
const ZSTD_C_SEARCH_LOG: c_int = 104;
|
||||
const ZSTD_C_MIN_MATCH: c_int = 105;
|
||||
const ZSTD_C_TARGET_LENGTH: c_int = 106;
|
||||
const ZSTD_C_STRATEGY: c_int = 107;
|
||||
|
||||
/// Private compression-parameter modes from `zstd_compress_internal.h`.
|
||||
///
|
||||
/// They are ABI-compatible with `ZSTD_CParamMode_e` and intentionally kept as
|
||||
/// integer constants because that enum remains private C API for now.
|
||||
pub const ZSTD_RUST_CPM_NO_ATTACH_DICT: c_int = 0;
|
||||
pub const ZSTD_RUST_CPM_ATTACH_DICT: c_int = 1;
|
||||
pub const ZSTD_RUST_CPM_CREATE_CDICT: c_int = 2;
|
||||
pub const ZSTD_RUST_CPM_UNKNOWN: c_int = 3;
|
||||
|
||||
/// `ZSTD_ParamSwitch_e` values used by the adjustment and sizing leaves.
|
||||
pub const ZSTD_RUST_PS_AUTO: c_int = 0;
|
||||
pub const ZSTD_RUST_PS_ENABLE: c_int = 1;
|
||||
pub const ZSTD_RUST_PS_DISABLE: c_int = 2;
|
||||
|
||||
/// ABI-compatible `ZSTD_compressionParameters` from `zstd.h`.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
pub struct ZSTD_compressionParameters {
|
||||
pub windowLog: u32,
|
||||
pub chainLog: u32,
|
||||
pub hashLog: u32,
|
||||
pub searchLog: u32,
|
||||
pub minMatch: u32,
|
||||
pub targetLength: u32,
|
||||
pub strategy: c_int,
|
||||
}
|
||||
|
||||
/// ABI-compatible `ZSTD_frameParameters` from `zstd.h`.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
pub struct ZSTD_frameParameters {
|
||||
pub contentSizeFlag: c_int,
|
||||
pub checksumFlag: c_int,
|
||||
pub noDictIDFlag: c_int,
|
||||
}
|
||||
|
||||
/// ABI-compatible `ZSTD_parameters` from `zstd.h`.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
pub struct ZSTD_parameters {
|
||||
pub cParams: ZSTD_compressionParameters,
|
||||
pub fParams: ZSTD_frameParameters,
|
||||
}
|
||||
|
||||
/// ABI-compatible `ZSTD_bounds` from `zstd.h`.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
|
||||
pub struct ZSTD_bounds {
|
||||
pub error: usize,
|
||||
pub lowerBound: c_int,
|
||||
pub upperBound: c_int,
|
||||
}
|
||||
|
||||
/* `clevels.h`, represented as raw fields so the table stays compact and easy
|
||||
* to compare mechanically against its C source. Field order is W, C, H, S,
|
||||
* L, TL, strategy. */
|
||||
const DEFAULT_CPARAMS: [[[u32; 7]; 23]; 4] = [
|
||||
[
|
||||
[19, 12, 13, 1, 6, 1, ZSTD_FAST as u32],
|
||||
[19, 13, 14, 1, 7, 0, ZSTD_FAST as u32],
|
||||
[20, 15, 16, 1, 6, 0, ZSTD_FAST as u32],
|
||||
[21, 16, 17, 1, 5, 0, ZSTD_DFAST as u32],
|
||||
[21, 18, 18, 1, 5, 0, ZSTD_DFAST as u32],
|
||||
[21, 18, 19, 3, 5, 2, ZSTD_GREEDY as u32],
|
||||
[21, 18, 19, 3, 5, 4, ZSTD_LAZY as u32],
|
||||
[21, 19, 20, 4, 5, 8, ZSTD_LAZY as u32],
|
||||
[21, 19, 20, 4, 5, 16, ZSTD_LAZY2 as u32],
|
||||
[22, 20, 21, 4, 5, 16, ZSTD_LAZY2 as u32],
|
||||
[22, 21, 22, 5, 5, 16, ZSTD_LAZY2 as u32],
|
||||
[22, 21, 22, 6, 5, 16, ZSTD_LAZY2 as u32],
|
||||
[22, 22, 23, 6, 5, 32, ZSTD_LAZY2 as u32],
|
||||
[22, 22, 22, 4, 5, 32, ZSTD_BTLAZY2 as u32],
|
||||
[22, 22, 23, 5, 5, 32, ZSTD_BTLAZY2 as u32],
|
||||
[22, 23, 23, 6, 5, 32, ZSTD_BTLAZY2 as u32],
|
||||
[22, 22, 22, 5, 5, 48, ZSTD_BTOPT as u32],
|
||||
[23, 23, 22, 5, 4, 64, ZSTD_BTOPT as u32],
|
||||
[23, 23, 22, 6, 3, 64, ZSTD_BTULTRA as u32],
|
||||
[23, 24, 22, 7, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[25, 25, 23, 7, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[26, 26, 24, 7, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[27, 27, 25, 9, 3, 999, ZSTD_BTULTRA2 as u32],
|
||||
],
|
||||
[
|
||||
[18, 12, 13, 1, 5, 1, ZSTD_FAST as u32],
|
||||
[18, 13, 14, 1, 6, 0, ZSTD_FAST as u32],
|
||||
[18, 14, 14, 1, 5, 0, ZSTD_DFAST as u32],
|
||||
[18, 16, 16, 1, 4, 0, ZSTD_DFAST as u32],
|
||||
[18, 16, 17, 3, 5, 2, ZSTD_GREEDY as u32],
|
||||
[18, 17, 18, 5, 5, 2, ZSTD_GREEDY as u32],
|
||||
[18, 18, 19, 3, 5, 4, ZSTD_LAZY as u32],
|
||||
[18, 18, 19, 4, 4, 4, ZSTD_LAZY as u32],
|
||||
[18, 18, 19, 4, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[18, 18, 19, 5, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[18, 18, 19, 6, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[18, 18, 19, 5, 4, 12, ZSTD_BTLAZY2 as u32],
|
||||
[18, 19, 19, 7, 4, 12, ZSTD_BTLAZY2 as u32],
|
||||
[18, 18, 19, 4, 4, 16, ZSTD_BTOPT as u32],
|
||||
[18, 18, 19, 4, 3, 32, ZSTD_BTOPT as u32],
|
||||
[18, 18, 19, 6, 3, 128, ZSTD_BTOPT as u32],
|
||||
[18, 19, 19, 6, 3, 128, ZSTD_BTULTRA as u32],
|
||||
[18, 19, 19, 8, 3, 256, ZSTD_BTULTRA as u32],
|
||||
[18, 19, 19, 6, 3, 128, ZSTD_BTULTRA2 as u32],
|
||||
[18, 19, 19, 8, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[18, 19, 19, 10, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[18, 19, 19, 12, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[18, 19, 19, 13, 3, 999, ZSTD_BTULTRA2 as u32],
|
||||
],
|
||||
[
|
||||
[17, 12, 12, 1, 5, 1, ZSTD_FAST as u32],
|
||||
[17, 12, 13, 1, 6, 0, ZSTD_FAST as u32],
|
||||
[17, 13, 15, 1, 5, 0, ZSTD_FAST as u32],
|
||||
[17, 15, 16, 2, 5, 0, ZSTD_DFAST as u32],
|
||||
[17, 17, 17, 2, 4, 0, ZSTD_DFAST as u32],
|
||||
[17, 16, 17, 3, 4, 2, ZSTD_GREEDY as u32],
|
||||
[17, 16, 17, 3, 4, 4, ZSTD_LAZY as u32],
|
||||
[17, 16, 17, 3, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[17, 16, 17, 4, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[17, 16, 17, 5, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[17, 16, 17, 6, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[17, 17, 17, 5, 4, 8, ZSTD_BTLAZY2 as u32],
|
||||
[17, 18, 17, 7, 4, 12, ZSTD_BTLAZY2 as u32],
|
||||
[17, 18, 17, 3, 4, 12, ZSTD_BTOPT as u32],
|
||||
[17, 18, 17, 4, 3, 32, ZSTD_BTOPT as u32],
|
||||
[17, 18, 17, 6, 3, 256, ZSTD_BTOPT as u32],
|
||||
[17, 18, 17, 6, 3, 128, ZSTD_BTULTRA as u32],
|
||||
[17, 18, 17, 8, 3, 256, ZSTD_BTULTRA as u32],
|
||||
[17, 18, 17, 10, 3, 512, ZSTD_BTULTRA as u32],
|
||||
[17, 18, 17, 5, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[17, 18, 17, 7, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[17, 18, 17, 9, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[17, 18, 17, 11, 3, 999, ZSTD_BTULTRA2 as u32],
|
||||
],
|
||||
[
|
||||
[14, 12, 13, 1, 5, 1, ZSTD_FAST as u32],
|
||||
[14, 14, 15, 1, 5, 0, ZSTD_FAST as u32],
|
||||
[14, 14, 15, 1, 4, 0, ZSTD_FAST as u32],
|
||||
[14, 14, 15, 2, 4, 0, ZSTD_DFAST as u32],
|
||||
[14, 14, 14, 4, 4, 2, ZSTD_GREEDY as u32],
|
||||
[14, 14, 14, 3, 4, 4, ZSTD_LAZY as u32],
|
||||
[14, 14, 14, 4, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[14, 14, 14, 6, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[14, 14, 14, 8, 4, 8, ZSTD_LAZY2 as u32],
|
||||
[14, 15, 14, 5, 4, 8, ZSTD_BTLAZY2 as u32],
|
||||
[14, 15, 14, 9, 4, 8, ZSTD_BTLAZY2 as u32],
|
||||
[14, 15, 14, 3, 4, 12, ZSTD_BTOPT as u32],
|
||||
[14, 15, 14, 4, 3, 24, ZSTD_BTOPT as u32],
|
||||
[14, 15, 14, 5, 3, 32, ZSTD_BTULTRA as u32],
|
||||
[14, 15, 15, 6, 3, 64, ZSTD_BTULTRA as u32],
|
||||
[14, 15, 15, 7, 3, 256, ZSTD_BTULTRA as u32],
|
||||
[14, 15, 15, 5, 3, 48, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 6, 3, 128, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 7, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 8, 3, 256, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 8, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 9, 3, 512, ZSTD_BTULTRA2 as u32],
|
||||
[14, 15, 15, 10, 3, 999, ZSTD_BTULTRA2 as u32],
|
||||
],
|
||||
];
|
||||
|
||||
#[inline]
|
||||
fn cparams_from_row(row: [u32; 7]) -> ZSTD_compressionParameters {
|
||||
ZSTD_compressionParameters {
|
||||
windowLog: row[0],
|
||||
chainLog: row[1],
|
||||
hashLog: row[2],
|
||||
searchLog: row[3],
|
||||
minMatch: row[4],
|
||||
targetLength: row[5],
|
||||
strategy: row[6] as c_int,
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn bounds(param: c_int) -> ZSTD_bounds {
|
||||
let (lowerBound, upperBound) = match param {
|
||||
ZSTD_C_COMPRESSION_LEVEL => (ZSTD_rust_params_minCLevel(), ZSTD_rust_params_maxCLevel()),
|
||||
ZSTD_C_WINDOW_LOG => (ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX),
|
||||
ZSTD_C_HASH_LOG => (ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX),
|
||||
ZSTD_C_CHAIN_LOG => (ZSTD_CHAINLOG_MIN, ZSTD_CHAINLOG_MAX),
|
||||
ZSTD_C_SEARCH_LOG => (ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX),
|
||||
ZSTD_C_MIN_MATCH => (ZSTD_MINMATCH_MIN, ZSTD_MINMATCH_MAX),
|
||||
ZSTD_C_TARGET_LENGTH => (ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX),
|
||||
ZSTD_C_STRATEGY => (ZSTD_FAST, ZSTD_BTULTRA2),
|
||||
_ => {
|
||||
return ZSTD_bounds {
|
||||
error: ERROR(ZstdErrorCode::ParameterUnsupported),
|
||||
lowerBound: 0,
|
||||
upperBound: 0,
|
||||
}
|
||||
}
|
||||
};
|
||||
ZSTD_bounds {
|
||||
error: 0,
|
||||
lowerBound,
|
||||
upperBound,
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn within_bounds(param: c_int, value: c_int) -> bool {
|
||||
let bounds = bounds(param);
|
||||
bounds.error == 0 && value >= bounds.lowerBound && value <= bounds.upperBound
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn clamp_unsigned(value: u32, param: c_int) -> u32 {
|
||||
let bounds = bounds(param);
|
||||
debug_assert_eq!(bounds.error, 0);
|
||||
let signed = value as c_int;
|
||||
if signed < bounds.lowerBound {
|
||||
bounds.lowerBound as u32
|
||||
} else if signed > bounds.upperBound {
|
||||
bounds.upperBound as u32
|
||||
} else {
|
||||
value
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn clamp_cparams(mut cparams: ZSTD_compressionParameters) -> ZSTD_compressionParameters {
|
||||
cparams.windowLog = clamp_unsigned(cparams.windowLog, ZSTD_C_WINDOW_LOG);
|
||||
cparams.chainLog = clamp_unsigned(cparams.chainLog, ZSTD_C_CHAIN_LOG);
|
||||
cparams.hashLog = clamp_unsigned(cparams.hashLog, ZSTD_C_HASH_LOG);
|
||||
cparams.searchLog = clamp_unsigned(cparams.searchLog, ZSTD_C_SEARCH_LOG);
|
||||
cparams.minMatch = clamp_unsigned(cparams.minMatch, ZSTD_C_MIN_MATCH);
|
||||
cparams.targetLength = clamp_unsigned(cparams.targetLength, ZSTD_C_TARGET_LENGTH);
|
||||
let strategy_bounds = bounds(ZSTD_C_STRATEGY);
|
||||
if cparams.strategy < strategy_bounds.lowerBound {
|
||||
cparams.strategy = strategy_bounds.lowerBound;
|
||||
} else if cparams.strategy > strategy_bounds.upperBound {
|
||||
cparams.strategy = strategy_bounds.upperBound;
|
||||
}
|
||||
cparams
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn highbit32(value: u32) -> u32 {
|
||||
debug_assert_ne!(value, 0);
|
||||
u32::BITS - 1 - value.leading_zeros()
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn cycle_log(hash_log: u32, strategy: c_int) -> u32 {
|
||||
hash_log.wrapping_sub((strategy >= ZSTD_BTLAZY2) as u32)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn strategy_supports_row_match_finder(strategy: c_int) -> bool {
|
||||
(ZSTD_GREEDY..=ZSTD_LAZY2).contains(&strategy)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn row_match_finder_used(strategy: c_int, mode: c_int) -> bool {
|
||||
debug_assert_ne!(mode, ZSTD_RUST_PS_AUTO);
|
||||
strategy_supports_row_match_finder(strategy) && mode == ZSTD_RUST_PS_ENABLE
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn resolve_row_match_finder(mode: c_int, cparams: ZSTD_compressionParameters) -> c_int {
|
||||
if mode != ZSTD_RUST_PS_AUTO {
|
||||
return mode;
|
||||
}
|
||||
if strategy_supports_row_match_finder(cparams.strategy) && cparams.windowLog > 14 {
|
||||
ZSTD_RUST_PS_ENABLE
|
||||
} else {
|
||||
ZSTD_RUST_PS_DISABLE
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn dict_and_window_log(window_log: u32, src_size: u64, dict_size: u64) -> u32 {
|
||||
/* 1ULL << ZSTD_WINDOWLOG_MAX, which is smaller for 32-bit builds. */
|
||||
const MAX_WINDOW_SIZE: u64 = 1u64 << ZSTD_WINDOWLOG_MAX;
|
||||
if dict_size == 0 {
|
||||
return window_log;
|
||||
}
|
||||
debug_assert!(window_log <= ZSTD_WINDOWLOG_MAX as u32);
|
||||
debug_assert_ne!(src_size, ZSTD_CONTENTSIZE_UNKNOWN);
|
||||
let window_size = 1u64 << window_log;
|
||||
if window_size >= dict_size.wrapping_add(src_size) {
|
||||
window_log
|
||||
} else {
|
||||
let dict_and_window_size = dict_size.wrapping_add(window_size);
|
||||
if dict_and_window_size >= MAX_WINDOW_SIZE {
|
||||
ZSTD_WINDOWLOG_MAX as u32
|
||||
} else {
|
||||
highbit32((dict_and_window_size as u32).wrapping_sub(1)) + 1
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Adjusts a *validated, configuration-resolved* parameter set.
|
||||
///
|
||||
/// This is the direct Rust leaf for `ZSTD_adjustCParams_internal()` after the
|
||||
/// C wrapper has applied its `ZSTD_EXCLUDE_*_BLOCK_COMPRESSOR` cascade. In
|
||||
/// particular, it does not select a fallback strategy itself. `srcSize == 0`
|
||||
/// means a known empty input here, just as it does in the C internal helper;
|
||||
/// the public C wrapper must translate zero to `ZSTD_CONTENTSIZE_UNKNOWN`.
|
||||
fn adjust_cparams(
|
||||
mut cparams: ZSTD_compressionParameters,
|
||||
mut src_size: u64,
|
||||
mut dict_size: usize,
|
||||
mode: c_int,
|
||||
mut use_row_match_finder: c_int,
|
||||
) -> ZSTD_compressionParameters {
|
||||
debug_assert_eq!(check_cparams(cparams), 0);
|
||||
|
||||
const MIN_SRC_SIZE: u64 = 513;
|
||||
/* 1ULL << (ZSTD_WINDOWLOG_MAX - 1), which is smaller for 32-bit builds. */
|
||||
const MAX_WINDOW_RESIZE: u64 = 1u64 << (ZSTD_WINDOWLOG_MAX - 1);
|
||||
|
||||
match mode {
|
||||
ZSTD_RUST_CPM_UNKNOWN | ZSTD_RUST_CPM_NO_ATTACH_DICT => {}
|
||||
ZSTD_RUST_CPM_CREATE_CDICT => {
|
||||
if dict_size != 0 && src_size == ZSTD_CONTENTSIZE_UNKNOWN {
|
||||
src_size = MIN_SRC_SIZE;
|
||||
}
|
||||
}
|
||||
ZSTD_RUST_CPM_ATTACH_DICT => dict_size = 0,
|
||||
_ => debug_assert!(false, "invalid ZSTD_CParamMode_e"),
|
||||
}
|
||||
|
||||
if src_size <= MAX_WINDOW_RESIZE && (dict_size as u64) <= MAX_WINDOW_RESIZE {
|
||||
let total_size = src_size.wrapping_add(dict_size as u64) as u32;
|
||||
let hash_size_min = 1u32 << ZSTD_HASHLOG_MIN;
|
||||
let src_log = if total_size < hash_size_min {
|
||||
ZSTD_HASHLOG_MIN as u32
|
||||
} else {
|
||||
highbit32(total_size.wrapping_sub(1)) + 1
|
||||
};
|
||||
cparams.windowLog = cparams.windowLog.min(src_log);
|
||||
}
|
||||
|
||||
if src_size != ZSTD_CONTENTSIZE_UNKNOWN {
|
||||
let dict_and_window_log =
|
||||
dict_and_window_log(cparams.windowLog, src_size, dict_size as u64);
|
||||
let cycle_log = cycle_log(cparams.chainLog, cparams.strategy);
|
||||
cparams.hashLog = cparams.hashLog.min(dict_and_window_log + 1);
|
||||
if cycle_log > dict_and_window_log {
|
||||
cparams.chainLog = cparams
|
||||
.chainLog
|
||||
.wrapping_sub(cycle_log - dict_and_window_log);
|
||||
}
|
||||
}
|
||||
|
||||
cparams.windowLog = cparams.windowLog.max(ZSTD_WINDOWLOG_MIN as u32);
|
||||
|
||||
/* The short-cache tags used for fast and dfast CDicts consume eight bits
|
||||
* of each 32-bit index. This is a fixed private-header constant today;
|
||||
* if it becomes configurable, the C shim must pass it as an explicit
|
||||
* adjustment input rather than silently changing this leaf. */
|
||||
if mode == ZSTD_RUST_CPM_CREATE_CDICT
|
||||
&& (cparams.strategy == ZSTD_FAST || cparams.strategy == ZSTD_DFAST)
|
||||
{
|
||||
const SHORT_CACHE_TAG_BITS: u32 = 8;
|
||||
let max_short_cache_hash_log = 32 - SHORT_CACHE_TAG_BITS;
|
||||
cparams.hashLog = cparams.hashLog.min(max_short_cache_hash_log);
|
||||
cparams.chainLog = cparams.chainLog.min(max_short_cache_hash_log);
|
||||
}
|
||||
|
||||
if use_row_match_finder == ZSTD_RUST_PS_AUTO {
|
||||
use_row_match_finder = ZSTD_RUST_PS_ENABLE;
|
||||
}
|
||||
if row_match_finder_used(cparams.strategy, use_row_match_finder) {
|
||||
const ROW_HASH_TAG_BITS: u32 = 8;
|
||||
let row_log = cparams.searchLog.clamp(4, 6);
|
||||
let max_hash_log = (32 - ROW_HASH_TAG_BITS) + row_log;
|
||||
debug_assert!(cparams.hashLog >= row_log);
|
||||
cparams.hashLog = cparams.hashLog.min(max_hash_log);
|
||||
}
|
||||
|
||||
cparams
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn get_cparam_row_size(src_size_hint: u64, dict_size: usize, mode: c_int) -> u64 {
|
||||
let mut dict_size = dict_size as u64;
|
||||
match mode {
|
||||
ZSTD_RUST_CPM_UNKNOWN | ZSTD_RUST_CPM_NO_ATTACH_DICT | ZSTD_RUST_CPM_CREATE_CDICT => {}
|
||||
ZSTD_RUST_CPM_ATTACH_DICT => dict_size = 0,
|
||||
_ => debug_assert!(false, "invalid ZSTD_CParamMode_e"),
|
||||
}
|
||||
let unknown = src_size_hint == ZSTD_CONTENTSIZE_UNKNOWN;
|
||||
let added_size = if unknown && dict_size > 0 { 500 } else { 0 };
|
||||
if unknown && dict_size == 0 {
|
||||
ZSTD_CONTENTSIZE_UNKNOWN
|
||||
} else {
|
||||
src_size_hint
|
||||
.wrapping_add(dict_size)
|
||||
.wrapping_add(added_size)
|
||||
}
|
||||
}
|
||||
|
||||
/// Selects a raw compression-level-table entry, without strategy cascading or
|
||||
/// source/dictionary adjustment.
|
||||
///
|
||||
/// A C wrapper must apply its active excluded-compressor cascade to the
|
||||
/// returned strategy before calling [`ZSTD_rust_params_adjustCParams`].
|
||||
fn select_cparams(
|
||||
compression_level: c_int,
|
||||
src_size_hint: u64,
|
||||
dict_size: usize,
|
||||
mode: c_int,
|
||||
) -> ZSTD_compressionParameters {
|
||||
let row_size = get_cparam_row_size(src_size_hint, dict_size, mode);
|
||||
let table_id = usize::from(row_size <= 256 * 1024)
|
||||
+ usize::from(row_size <= 128 * 1024)
|
||||
+ usize::from(row_size <= 16 * 1024);
|
||||
let row = if compression_level == 0 {
|
||||
ZSTD_CLEVEL_DEFAULT
|
||||
} else if compression_level < 0 {
|
||||
0
|
||||
} else {
|
||||
compression_level.min(ZSTD_MAX_CLEVEL)
|
||||
} as usize;
|
||||
|
||||
let mut cparams = cparams_from_row(DEFAULT_CPARAMS[table_id][row]);
|
||||
if compression_level < 0 {
|
||||
let clamped = compression_level.max(ZSTD_rust_params_minCLevel());
|
||||
cparams.targetLength = (-clamped) as u32;
|
||||
}
|
||||
cparams
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn make_params(cparams: ZSTD_compressionParameters) -> ZSTD_parameters {
|
||||
ZSTD_parameters {
|
||||
cParams: cparams,
|
||||
fParams: ZSTD_frameParameters {
|
||||
contentSizeFlag: 1,
|
||||
checksumFlag: 0,
|
||||
noDictIDFlag: 0,
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn check_cparams(cparams: ZSTD_compressionParameters) -> usize {
|
||||
if !within_bounds(ZSTD_C_WINDOW_LOG, cparams.windowLog as c_int)
|
||||
|| !within_bounds(ZSTD_C_CHAIN_LOG, cparams.chainLog as c_int)
|
||||
|| !within_bounds(ZSTD_C_HASH_LOG, cparams.hashLog as c_int)
|
||||
|| !within_bounds(ZSTD_C_SEARCH_LOG, cparams.searchLog as c_int)
|
||||
|| !within_bounds(ZSTD_C_MIN_MATCH, cparams.minMatch as c_int)
|
||||
|| !within_bounds(ZSTD_C_TARGET_LENGTH, cparams.targetLength as c_int)
|
||||
|| !within_bounds(ZSTD_C_STRATEGY, cparams.strategy)
|
||||
{
|
||||
ERROR(ZstdErrorCode::ParameterOutOfBound)
|
||||
} else {
|
||||
0
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns the highest table-backed compression level (`ZSTD_MAX_CLEVEL`).
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_maxCLevel() -> c_int {
|
||||
ZSTD_MAX_CLEVEL
|
||||
}
|
||||
|
||||
/// Returns the lowest public fast level (`-ZSTD_TARGETLENGTH_MAX`).
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_minCLevel() -> c_int {
|
||||
-ZSTD_TARGETLENGTH_MAX
|
||||
}
|
||||
|
||||
/// Returns the default compression level from `zstd.h`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_defaultCLevel() -> c_int {
|
||||
ZSTD_CLEVEL_DEFAULT
|
||||
}
|
||||
|
||||
/// Returns bounds for the seven core compression parameters and compression
|
||||
/// level. Other `ZSTD_cParameter` cases remain C-owned.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_getBounds(param: c_int) -> ZSTD_bounds {
|
||||
bounds(param)
|
||||
}
|
||||
|
||||
/// Checks the seven fields of `ZSTD_compressionParameters`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_checkCParams(cparams: ZSTD_compressionParameters) -> usize {
|
||||
check_cparams(cparams)
|
||||
}
|
||||
|
||||
/// Clamps the seven fields of `ZSTD_compressionParameters` to public bounds.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_clampCParams(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
) -> ZSTD_compressionParameters {
|
||||
clamp_cparams(cparams)
|
||||
}
|
||||
|
||||
/// C ABI for `ZSTD_cycleLog()`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_cycleLog(hashLog: u32, strategy: c_int) -> u32 {
|
||||
cycle_log(hashLog, strategy)
|
||||
}
|
||||
|
||||
/// C ABI for private `ZSTD_getCParamRowSize()`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_getCParamRowSize(
|
||||
srcSizeHint: u64,
|
||||
dictSize: usize,
|
||||
mode: c_int,
|
||||
) -> u64 {
|
||||
get_cparam_row_size(srcSizeHint, dictSize, mode)
|
||||
}
|
||||
|
||||
/// Returns the unadjusted compression-level-table entry.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_selectCParams(
|
||||
compressionLevel: c_int,
|
||||
srcSizeHint: u64,
|
||||
dictSize: usize,
|
||||
mode: c_int,
|
||||
) -> ZSTD_compressionParameters {
|
||||
select_cparams(compressionLevel, srcSizeHint, dictSize, mode)
|
||||
}
|
||||
|
||||
/// Adjusts a validated, strategy-resolved C parameter set.
|
||||
///
|
||||
/// See [`adjust_cparams`] for the required C-side policy step.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_adjustCParams(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
srcSize: u64,
|
||||
dictSize: usize,
|
||||
mode: c_int,
|
||||
useRowMatchFinder: c_int,
|
||||
) -> ZSTD_compressionParameters {
|
||||
adjust_cparams(cparams, srcSize, dictSize, mode, useRowMatchFinder)
|
||||
}
|
||||
|
||||
/// Builds `ZSTD_parameters` with the public default frame parameters.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_makeParams(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
) -> ZSTD_parameters {
|
||||
make_params(cparams)
|
||||
}
|
||||
|
||||
/// Runtime sizes needed to reproduce `ZSTD_sizeof_matchState()` without
|
||||
/// exposing private C structures to Rust.
|
||||
///
|
||||
/// `asanRedzoneSize` is `ZSTD_CWKSP_ASAN_REDZONE_SIZE` when workspace
|
||||
/// poisoning is enabled and zero otherwise. `matchTSize` and `optimalTSize`
|
||||
/// must be `sizeof(ZSTD_match_t)` and `sizeof(ZSTD_optimal_t)` respectively.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default)]
|
||||
pub struct ZSTD_rustMatchStateSizing {
|
||||
pub hashLog3Max: u32,
|
||||
pub matchTSize: usize,
|
||||
pub optimalTSize: usize,
|
||||
pub asanRedzoneSize: usize,
|
||||
}
|
||||
|
||||
/// C-only layout inputs for `ZSTD_estimateCDictSize_advanced()`.
|
||||
#[repr(C)]
|
||||
#[derive(Clone, Copy, Debug, Default)]
|
||||
pub struct ZSTD_rustCDictSizing {
|
||||
pub cdictSize: usize,
|
||||
pub hufWorkspaceSize: usize,
|
||||
pub hashLog3Max: u32,
|
||||
pub matchTSize: usize,
|
||||
pub optimalTSize: usize,
|
||||
pub asanRedzoneSize: usize,
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn cwksp_alloc_size(size: usize, asan_redzone_size: usize) -> usize {
|
||||
if size == 0 {
|
||||
0
|
||||
} else {
|
||||
size.wrapping_add(asan_redzone_size.wrapping_mul(2))
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn cwksp_align(size: usize, alignment: usize) -> usize {
|
||||
debug_assert!(alignment.is_power_of_two());
|
||||
size.wrapping_add(alignment - 1) & !(alignment - 1)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn cwksp_aligned64_alloc_size(size: usize, asan_redzone_size: usize) -> usize {
|
||||
cwksp_alloc_size(cwksp_align(size, 64), asan_redzone_size)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn shift_size(log: u32) -> usize {
|
||||
debug_assert!(log < usize::BITS);
|
||||
1usize << log
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn allocate_chain_table(strategy: c_int, use_row_match_finder: c_int, for_dds_dict: bool) -> bool {
|
||||
for_dds_dict
|
||||
|| (strategy != ZSTD_FAST && !row_match_finder_used(strategy, use_row_match_finder))
|
||||
}
|
||||
|
||||
fn estimate_match_state_size(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
use_row_match_finder: c_int,
|
||||
enable_dedicated_dict_search: bool,
|
||||
for_cctx: bool,
|
||||
sizing: ZSTD_rustMatchStateSizing,
|
||||
) -> usize {
|
||||
if check_cparams(cparams) != 0 || use_row_match_finder == ZSTD_RUST_PS_AUTO {
|
||||
return 0;
|
||||
}
|
||||
|
||||
let chain_size = if allocate_chain_table(
|
||||
cparams.strategy,
|
||||
use_row_match_finder,
|
||||
enable_dedicated_dict_search && !for_cctx,
|
||||
) {
|
||||
shift_size(cparams.chainLog)
|
||||
} else {
|
||||
0
|
||||
};
|
||||
let hash_size = shift_size(cparams.hashLog);
|
||||
let hash_log_3 = if for_cctx && cparams.minMatch == 3 {
|
||||
cparams.windowLog.min(sizing.hashLog3Max)
|
||||
} else {
|
||||
0
|
||||
};
|
||||
let hash3_size = if hash_log_3 == 0 {
|
||||
0
|
||||
} else {
|
||||
shift_size(hash_log_3)
|
||||
};
|
||||
let table_space = chain_size
|
||||
.wrapping_mul(size_of::<u32>())
|
||||
.wrapping_add(hash_size.wrapping_mul(size_of::<u32>()))
|
||||
.wrapping_add(hash3_size.wrapping_mul(size_of::<u32>()));
|
||||
|
||||
let redzone = sizing.asanRedzoneSize;
|
||||
let opt_potential_space = cwksp_aligned64_alloc_size((52 + 1) * size_of::<u32>(), redzone)
|
||||
.wrapping_add(cwksp_aligned64_alloc_size(
|
||||
(35 + 1) * size_of::<u32>(),
|
||||
redzone,
|
||||
))
|
||||
.wrapping_add(cwksp_aligned64_alloc_size(
|
||||
(31 + 1) * size_of::<u32>(),
|
||||
redzone,
|
||||
))
|
||||
.wrapping_add(cwksp_aligned64_alloc_size(
|
||||
(1 << 8) * size_of::<u32>(),
|
||||
redzone,
|
||||
))
|
||||
.wrapping_add(cwksp_aligned64_alloc_size(
|
||||
4099usize.wrapping_mul(sizing.matchTSize),
|
||||
redzone,
|
||||
))
|
||||
.wrapping_add(cwksp_aligned64_alloc_size(
|
||||
4099usize.wrapping_mul(sizing.optimalTSize),
|
||||
redzone,
|
||||
));
|
||||
let lazy_additional_space = if row_match_finder_used(cparams.strategy, use_row_match_finder) {
|
||||
cwksp_aligned64_alloc_size(hash_size, redzone)
|
||||
} else {
|
||||
0
|
||||
};
|
||||
let opt_space = if for_cctx && cparams.strategy >= ZSTD_BTOPT {
|
||||
opt_potential_space
|
||||
} else {
|
||||
0
|
||||
};
|
||||
let slack_space = 2 * 64;
|
||||
|
||||
table_space
|
||||
.wrapping_add(opt_space)
|
||||
.wrapping_add(slack_space)
|
||||
.wrapping_add(lazy_additional_space)
|
||||
}
|
||||
|
||||
/// Pure leaf for private `ZSTD_sizeof_matchState()`.
|
||||
///
|
||||
/// `useRowMatchFinder` must already be resolved to enable or disable. A NULL
|
||||
/// `sizing` pointer or invalid C parameters returns zero; C never supplies
|
||||
/// either in a valid estimator call.
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTD_rust_params_estimateMatchStateSize(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
useRowMatchFinder: c_int,
|
||||
enableDedicatedDictSearch: c_int,
|
||||
forCCtx: u32,
|
||||
sizing: *const ZSTD_rustMatchStateSizing,
|
||||
) -> usize {
|
||||
if sizing.is_null() {
|
||||
return 0;
|
||||
}
|
||||
let sizing = unsafe { *sizing };
|
||||
estimate_match_state_size(
|
||||
cparams,
|
||||
useRowMatchFinder,
|
||||
enableDedicatedDictSearch != 0,
|
||||
forCCtx != 0,
|
||||
sizing,
|
||||
)
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn max_nb_seq(block_size: usize, min_match: u32, use_sequence_producer: bool) -> usize {
|
||||
let divider = if min_match == 3 || use_sequence_producer {
|
||||
3
|
||||
} else {
|
||||
4
|
||||
};
|
||||
block_size / divider
|
||||
}
|
||||
|
||||
/// Pure leaf for private `ZSTD_maxNbSeq()`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_maxNbSeq(
|
||||
blockSize: usize,
|
||||
minMatch: u32,
|
||||
useSequenceProducer: c_int,
|
||||
) -> usize {
|
||||
max_nb_seq(blockSize, minMatch, useSequenceProducer != 0)
|
||||
}
|
||||
|
||||
/// Pure leaf for private `ZSTD_resolveMaxBlockSize()`.
|
||||
#[no_mangle]
|
||||
pub extern "C" fn ZSTD_rust_params_resolveMaxBlockSize(maxBlockSize: usize) -> usize {
|
||||
if maxBlockSize == 0 {
|
||||
ZSTD_BLOCKSIZE_MAX
|
||||
} else {
|
||||
maxBlockSize
|
||||
}
|
||||
}
|
||||
|
||||
fn estimate_cdict_size_from_cparams(
|
||||
dict_size: usize,
|
||||
cparams: ZSTD_compressionParameters,
|
||||
dict_load_method: c_int,
|
||||
sizing: ZSTD_rustCDictSizing,
|
||||
) -> usize {
|
||||
if check_cparams(cparams) != 0 {
|
||||
return 0;
|
||||
}
|
||||
let match_state_sizing = ZSTD_rustMatchStateSizing {
|
||||
hashLog3Max: sizing.hashLog3Max,
|
||||
matchTSize: sizing.matchTSize,
|
||||
optimalTSize: sizing.optimalTSize,
|
||||
asanRedzoneSize: sizing.asanRedzoneSize,
|
||||
};
|
||||
let row_match_finder = resolve_row_match_finder(ZSTD_RUST_PS_AUTO, cparams);
|
||||
let copied_dict_space = if dict_load_method == 1 {
|
||||
0
|
||||
} else {
|
||||
cwksp_alloc_size(
|
||||
cwksp_align(dict_size, size_of::<usize>()),
|
||||
sizing.asanRedzoneSize,
|
||||
)
|
||||
};
|
||||
cwksp_alloc_size(sizing.cdictSize, sizing.asanRedzoneSize)
|
||||
.wrapping_add(cwksp_alloc_size(
|
||||
sizing.hufWorkspaceSize,
|
||||
sizing.asanRedzoneSize,
|
||||
))
|
||||
.wrapping_add(estimate_match_state_size(
|
||||
cparams,
|
||||
row_match_finder,
|
||||
true,
|
||||
false,
|
||||
match_state_sizing,
|
||||
))
|
||||
.wrapping_add(copied_dict_space)
|
||||
}
|
||||
|
||||
/// Parameter-only leaf for `ZSTD_estimateCDictSize_advanced()`.
|
||||
///
|
||||
/// C retains ownership of `sizeof(ZSTD_CDict)`, HUF workspace configuration,
|
||||
/// and sanitizer workspace policy, then passes them in `sizing`. A NULL sizing
|
||||
/// pointer returns zero.
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn ZSTD_rust_params_estimateCDictSizeFromCParams(
|
||||
dictSize: usize,
|
||||
cparams: ZSTD_compressionParameters,
|
||||
dictLoadMethod: c_int,
|
||||
sizing: *const ZSTD_rustCDictSizing,
|
||||
) -> usize {
|
||||
if sizing.is_null() {
|
||||
return 0;
|
||||
}
|
||||
estimate_cdict_size_from_cparams(dictSize, cparams, dictLoadMethod, unsafe { *sizing })
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use crate::errors::ERR_isError;
|
||||
use std::mem::{align_of, size_of};
|
||||
|
||||
fn adjust_public(
|
||||
cparams: ZSTD_compressionParameters,
|
||||
src_size: u64,
|
||||
dict_size: usize,
|
||||
) -> ZSTD_compressionParameters {
|
||||
let src_size = if src_size == 0 {
|
||||
ZSTD_CONTENTSIZE_UNKNOWN
|
||||
} else {
|
||||
src_size
|
||||
};
|
||||
adjust_cparams(
|
||||
clamp_cparams(cparams),
|
||||
src_size,
|
||||
dict_size,
|
||||
ZSTD_RUST_CPM_UNKNOWN,
|
||||
ZSTD_RUST_PS_AUTO,
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn abi_parameter_layouts_match_zstd_h() {
|
||||
assert_eq!(
|
||||
size_of::<ZSTD_compressionParameters>(),
|
||||
7 * size_of::<u32>()
|
||||
);
|
||||
assert_eq!(align_of::<ZSTD_compressionParameters>(), align_of::<u32>());
|
||||
assert_eq!(size_of::<ZSTD_frameParameters>(), 3 * size_of::<c_int>());
|
||||
assert_eq!(size_of::<ZSTD_parameters>(), 10 * size_of::<u32>());
|
||||
assert_eq!(
|
||||
size_of::<ZSTD_bounds>(),
|
||||
size_of::<usize>() + 2 * size_of::<c_int>()
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn level_tables_match_representative_clevels_entries() {
|
||||
let large = select_cparams(3, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN);
|
||||
assert_eq!(
|
||||
large,
|
||||
ZSTD_compressionParameters {
|
||||
windowLog: 21,
|
||||
chainLog: 16,
|
||||
hashLog: 17,
|
||||
searchLog: 1,
|
||||
minMatch: 5,
|
||||
targetLength: 0,
|
||||
strategy: ZSTD_DFAST,
|
||||
}
|
||||
);
|
||||
|
||||
let small = select_cparams(3, 16 * 1024, 0, ZSTD_RUST_CPM_UNKNOWN);
|
||||
assert_eq!(
|
||||
small,
|
||||
ZSTD_compressionParameters {
|
||||
windowLog: 14,
|
||||
chainLog: 14,
|
||||
hashLog: 15,
|
||||
searchLog: 2,
|
||||
minMatch: 4,
|
||||
targetLength: 0,
|
||||
strategy: ZSTD_DFAST,
|
||||
}
|
||||
);
|
||||
|
||||
let fast = select_cparams(-5, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN);
|
||||
assert_eq!(fast.strategy, ZSTD_FAST);
|
||||
assert_eq!(fast.targetLength, 5);
|
||||
assert_eq!(
|
||||
select_cparams(999, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN),
|
||||
select_cparams(22, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN)
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn adjustment_clamps_and_downsizes_like_the_c_leaf() {
|
||||
let input = ZSTD_compressionParameters {
|
||||
windowLog: 31,
|
||||
chainLog: 30,
|
||||
hashLog: 30,
|
||||
searchLog: 1,
|
||||
minMatch: 3,
|
||||
targetLength: 0,
|
||||
strategy: ZSTD_BTOPT,
|
||||
};
|
||||
let adjusted = adjust_public(input, 1, 0);
|
||||
assert_eq!(adjusted.windowLog, 10);
|
||||
/* C applies WINDOWLOG_ABSOLUTEMIN only after it has used the smaller
|
||||
* temporary window to downsize the hash and chain logs. */
|
||||
assert_eq!(adjusted.hashLog, 7);
|
||||
assert_eq!(adjusted.chainLog, 7);
|
||||
assert_eq!(ZSTD_rust_params_checkCParams(adjusted), 0);
|
||||
|
||||
let clamped = ZSTD_rust_params_clampCParams(ZSTD_compressionParameters {
|
||||
windowLog: u32::MAX,
|
||||
chainLog: 0,
|
||||
hashLog: 0,
|
||||
searchLog: 0,
|
||||
minMatch: 0,
|
||||
targetLength: u32::MAX,
|
||||
strategy: 99,
|
||||
});
|
||||
assert_eq!(clamped.windowLog, ZSTD_WINDOWLOG_MIN as u32);
|
||||
assert_eq!(clamped.chainLog, ZSTD_CHAINLOG_MIN as u32);
|
||||
assert_eq!(clamped.hashLog, ZSTD_HASHLOG_MIN as u32);
|
||||
assert_eq!(clamped.searchLog, ZSTD_SEARCHLOG_MIN as u32);
|
||||
assert_eq!(clamped.minMatch, ZSTD_MINMATCH_MIN as u32);
|
||||
assert_eq!(clamped.targetLength, ZSTD_TARGETLENGTH_MIN as u32);
|
||||
assert_eq!(clamped.strategy, ZSTD_BTULTRA2);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn checking_and_bounds_preserve_the_public_error_contract() {
|
||||
let valid = select_cparams(1, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN);
|
||||
assert_eq!(check_cparams(valid), 0);
|
||||
let mut invalid = valid;
|
||||
invalid.minMatch = 2;
|
||||
assert!(ERR_isError(check_cparams(invalid)));
|
||||
let bounds = ZSTD_rust_params_getBounds(ZSTD_C_HASH_LOG);
|
||||
assert_eq!(bounds.error, 0);
|
||||
assert_eq!(bounds.lowerBound, 6);
|
||||
assert_eq!(bounds.upperBound, 30);
|
||||
assert!(ERR_isError(ZSTD_rust_params_getBounds(-1).error));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn params_default_frame_flags_match_c() {
|
||||
let cparams = select_cparams(5, ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN);
|
||||
let params = ZSTD_rust_params_makeParams(cparams);
|
||||
assert_eq!(params.cParams, cparams);
|
||||
assert_eq!(params.fParams.contentSizeFlag, 1);
|
||||
assert_eq!(params.fParams.checksumFlag, 0);
|
||||
assert_eq!(params.fParams.noDictIDFlag, 0);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn row_size_preserves_unknown_dictionary_overflow_semantics() {
|
||||
assert_eq!(
|
||||
get_cparam_row_size(ZSTD_CONTENTSIZE_UNKNOWN, 0, ZSTD_RUST_CPM_UNKNOWN),
|
||||
ZSTD_CONTENTSIZE_UNKNOWN
|
||||
);
|
||||
assert_eq!(
|
||||
get_cparam_row_size(ZSTD_CONTENTSIZE_UNKNOWN, 1, ZSTD_RUST_CPM_UNKNOWN),
|
||||
500
|
||||
);
|
||||
assert_eq!(
|
||||
get_cparam_row_size(128 * 1024, 1, ZSTD_RUST_CPM_ATTACH_DICT),
|
||||
128 * 1024
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn match_state_sizing_reproduces_table_and_row_rules() {
|
||||
let sizing = ZSTD_rustMatchStateSizing {
|
||||
hashLog3Max: 17,
|
||||
matchTSize: 16,
|
||||
optimalTSize: 32,
|
||||
asanRedzoneSize: 0,
|
||||
};
|
||||
let fast = ZSTD_compressionParameters {
|
||||
windowLog: 10,
|
||||
chainLog: 10,
|
||||
hashLog: 10,
|
||||
searchLog: 1,
|
||||
minMatch: 4,
|
||||
targetLength: 0,
|
||||
strategy: ZSTD_FAST,
|
||||
};
|
||||
assert_eq!(
|
||||
estimate_match_state_size(fast, ZSTD_RUST_PS_DISABLE, false, true, sizing),
|
||||
4096 + 128
|
||||
);
|
||||
|
||||
let row = ZSTD_compressionParameters {
|
||||
windowLog: 15,
|
||||
chainLog: 10,
|
||||
hashLog: 10,
|
||||
searchLog: 4,
|
||||
minMatch: 4,
|
||||
targetLength: 0,
|
||||
strategy: ZSTD_GREEDY,
|
||||
};
|
||||
assert_eq!(
|
||||
estimate_match_state_size(row, ZSTD_RUST_PS_ENABLE, false, true, sizing),
|
||||
4096 + 1024 + 128
|
||||
);
|
||||
assert_eq!(ZSTD_rust_params_maxNbSeq(100, 3, 0), 33);
|
||||
assert_eq!(ZSTD_rust_params_maxNbSeq(100, 4, 0), 25);
|
||||
assert_eq!(ZSTD_rust_params_resolveMaxBlockSize(0), 128 * 1024);
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user