ddidderr/zstd-rs
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changed validateParams() into checkParams() + adjustParams()

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This commit is contained in:
Yann Collet
2016-03-30 16:50:44 +02:00
parent b44be74244
commit 21588e370b
5 changed files with 77 additions and 34 deletions
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lib/zstd_compress.c
+63 -30
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@@ -133,35 +133,51 @@ const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx) /* hidden interface *
}
#define CLAMP(val,min,max) { if (val<min) val=min; else if (val>max) val=max; }
#define CLAMPCHECK(val,min,max) { if ((val<min) || (val>max)) return ERROR(compressionParameter_unsupported); }
/** ZSTD_checkParams() :
ensure param values remain within authorized range.
@return : 0, or an error code if one value is beyond authorized range */
size_t ZSTD_checkParams(ZSTD_parameters params)
{
{ U32 const windowLog_max = MEM_32bits() ? 25 : ZSTD_WINDOWLOG_MAX; /* 32 bits mode cannot flush > 24 bits */
CLAMPCHECK(params.windowLog, ZSTD_WINDOWLOG_MIN, windowLog_max); }
CLAMPCHECK(params.contentLog, ZSTD_CONTENTLOG_MIN, ZSTD_CONTENTLOG_MAX);
CLAMPCHECK(params.hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
CLAMPCHECK(params.searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
{ U32 const searchLengthMin = (params.strategy == ZSTD_btopt) ? ZSTD_SEARCHLENGTH_MIN : ZSTD_SEARCHLENGTH_MIN+1;
U32 const searchLengthMax = (params.strategy == ZSTD_fast) ? ZSTD_SEARCHLENGTH_MAX : ZSTD_SEARCHLENGTH_MAX-1;
CLAMPCHECK(params.searchLength, searchLengthMin, searchLengthMax); }
CLAMPCHECK(params.targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
CLAMPCHECK((U32)(params.strategy), 0, (U32)ZSTD_btopt);
return 0;
}
static unsigned ZSTD_highbit(U32 val);
#define CLAMP(val,min,max) { if (val<min) val=min; else if (val>max) val=max; }
/** ZSTD_validateParams() :
correct params value to remain within authorized range,
optimize for `srcSize` if srcSize > 0 */
void ZSTD_validateParams(ZSTD_parameters* params)
/** ZSTD_adjustParams() :
optimize params for q given input (`srcSize` and `dictSize`).
mostly downsizing to reduce memory consumption and initialization.
Both `srcSize` and `dictSize` are optional (use 0 if unknown),
but if both are 0, no optimization can be done.
Note : params is considered validated at this stage. Use ZSTD_checkParams() to ensure that. */
void ZSTD_adjustParams(ZSTD_parameters* params, size_t srcSize, size_t dictSize)
{
/* validate params */
if (MEM_32bits()) if (params->windowLog > 25) params->windowLog = 25; /* 32 bits mode cannot flush > 24 bits */
CLAMP(params->windowLog, ZSTD_WINDOWLOG_MIN, ZSTD_WINDOWLOG_MAX);
CLAMP(params->contentLog, ZSTD_CONTENTLOG_MIN, ZSTD_CONTENTLOG_MAX);
CLAMP(params->hashLog, ZSTD_HASHLOG_MIN, ZSTD_HASHLOG_MAX);
CLAMP(params->searchLog, ZSTD_SEARCHLOG_MIN, ZSTD_SEARCHLOG_MAX);
{ U32 const searchLengthMin = (params->strategy == ZSTD_btopt) ? ZSTD_SEARCHLENGTH_MIN : ZSTD_SEARCHLENGTH_MIN+1;
U32 const searchLengthMax = (params->strategy == ZSTD_fast) ? ZSTD_SEARCHLENGTH_MAX : ZSTD_SEARCHLENGTH_MAX-1;
CLAMP(params->searchLength, searchLengthMin, searchLengthMax); }
CLAMP(params->targetLength, ZSTD_TARGETLENGTH_MIN, ZSTD_TARGETLENGTH_MAX);
if ((U32)params->strategy>(U32)ZSTD_btopt) params->strategy = ZSTD_btopt;
if (srcSize+dictSize == 0) return; /* no size information available : no adjustment */
/* resize params, to use less memory when necessary */
if ((params->srcSize > 0) && (params->srcSize < (1<<ZSTD_WINDOWLOG_MAX))) {
U32 const srcLog = ZSTD_highbit((U32)(params->srcSize)-1) + 1;
if (params->windowLog > srcLog) params->windowLog = srcLog;
}
{ size_t const minSrcSize = (srcSize==0) ? 500 : 0;
size_t const rSize = srcSize + dictSize + minSrcSize;
if (rSize < (1<<ZSTD_WINDOWLOG_MAX)) {
U32 const srcLog = ZSTD_highbit((U32)(rSize)-1) + 1;
if (params->windowLog > srcLog) params->windowLog = srcLog;
} }
if (params->hashLog > params->windowLog) params->hashLog = params->windowLog;
{ U32 const btPlus = (params->strategy == ZSTD_btlazy2) || (params->strategy == ZSTD_btopt);
if (params->contentLog > params->windowLog+btPlus) params->contentLog = params->windowLog+btPlus; } /* <= ZSTD_CONTENTLOG_MAX */
{ U32 const btPlus = (params->strategy == ZSTD_btlazy2) || (params->strategy == ZSTD_btopt);
U32 const maxContentLog = params->windowLog+btPlus;
if (params->contentLog > maxContentLog) params->contentLog = maxContentLog; } /* <= ZSTD_CONTENTLOG_MAX */
if (params->windowLog < ZSTD_WINDOWLOG_ABSOLUTEMIN) params->windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN; /* required for frame header */
}
@@ -2194,9 +2210,9 @@ static size_t ZSTD_compress_insertDictionary(ZSTD_CCtx* zc, const void* dict, si
if (MEM_readLE32(dict) != ZSTD_DICT_MAGIC) return ZSTD_loadDictionaryContent(zc, dict, dictSize);
/* known magic number : dict is parsed for entropy stats and content */
{ size_t const eSize = ZSTD_loadDictEntropyStats(zc, (const char*)dict+4 /* skip magic */, dictSize-4) + 4;
if (ZSTD_isError(eSize)) return eSize;
return ZSTD_loadDictionaryContent(zc, (const char*)dict+eSize, dictSize-eSize);
{ size_t const eSize = ZSTD_loadDictEntropyStats(zc, (const char*)dict+4 /* skip magic */, dictSize-4) + 4;
if (ZSTD_isError(eSize)) return eSize;
return ZSTD_loadDictionaryContent(zc, (const char*)dict+eSize, dictSize-eSize);
}
}
@@ -2207,7 +2223,11 @@ size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* zc,
const void* dict, size_t dictSize,
ZSTD_parameters params)
{
ZSTD_validateParams(&params);
/* compression parameters verification and optimization */
{ size_t const errorCode = ZSTD_checkParams(params);
if (ZSTD_isError(errorCode)) return errorCode; }
ZSTD_adjustParams(&params, 0, dictSize);
{ size_t const errorCode = ZSTD_resetCCtx_advanced(zc, params);
if (ZSTD_isError(errorCode)) return errorCode; }
@@ -2295,7 +2315,7 @@ size_t ZSTD_compress_usingPreparedCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* prepare
}
size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
static size_t ZSTD_compress_internal (ZSTD_CCtx* ctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict,size_t dictSize,
@@ -2322,16 +2342,29 @@ size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
return (op - ostart);
}
size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
void* dst, size_t dstCapacity,
const void* src, size_t srcSize,
const void* dict,size_t dictSize,
ZSTD_parameters params)
{
size_t const errorCode = ZSTD_checkParams(params);
if (ZSTD_isError(errorCode)) return errorCode;
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
}
size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, const void* dict, size_t dictSize, int compressionLevel)
{
ZSTD_parameters params = ZSTD_getParams(compressionLevel, srcSize+dictSize);
ZSTD_LOG_BLOCK("%p: ZSTD_compress_usingDict srcSize=%d dictSize=%d compressionLevel=%d\n", ctx->base, (int)srcSize, (int)dictSize, compressionLevel);
return ZSTD_compress_advanced(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, ZSTD_getParams(compressionLevel, srcSize));
ZSTD_adjustParams(&params, srcSize, dictSize);
return ZSTD_compress_internal(ctx, dst, dstCapacity, src, srcSize, dict, dictSize, params);
}
size_t ZSTD_compressCCtx (ZSTD_CCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)
{
ZSTD_LOG_BLOCK("%p: ZSTD_compressCCtx srcSize=%d compressionLevel=%d\n", ctx->base, (int)srcSize, compressionLevel);
return ZSTD_compress_advanced(ctx, dst, dstCapacity, src, srcSize, NULL, 0, ZSTD_getParams(compressionLevel, srcSize));
return ZSTD_compress_usingDict(ctx, dst, dstCapacity, src, srcSize, NULL, 0, compressionLevel);
}
size_t ZSTD_compress(void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel)