ddidderr/zstd-rs
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added ZSTD_compress_usingDict()

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This commit is contained in:
Yann Collet
2015-12-17 23:50:15 +01:00
parent 035c5429ba
commit fdcad6d3e1
4 changed files with 50 additions and 7 deletions
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lib/zstd_compress.c
+38
View File
@@ -2180,3 +2180,41 @@ size_t ZSTD_compress(void* dst, size_t maxDstSize, const void* src, size_t srcSi
free(ctxBody.workSpace); /* can't free ctxBody, since it's on stack; free heap content */
return result;
}
size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx,
void* dst, size_t maxDstSize,
const void* src, size_t srcSize,
const void* dict, size_t dictSize,
int compressionLevel)
{
BYTE* const ostart = (BYTE*)dst;
BYTE* op = ostart;
size_t oSize;
/* Header */
oSize = ZSTD_compressBegin_advanced(ctx, dst, maxDstSize, ZSTD_getParams(compressionLevel, srcSize+dictSize));
if (ZSTD_isError(oSize)) return oSize;
op += oSize;
maxDstSize -= oSize;
if (dict)
{
oSize = ZSTD_compress_insertDictionary(ctx, dict, dictSize);
if (ZSTD_isError(oSize)) return oSize;
}
/* body (compression) */
oSize = ZSTD_compressContinue(ctx, op, maxDstSize, src, srcSize);
if (ZSTD_isError(oSize)) return oSize;
op += oSize;
maxDstSize -= oSize;
/* Close frame */
oSize = ZSTD_compressEnd(ctx, op, maxDstSize);
if (ZSTD_isError(oSize)) return oSize;
op += oSize;
return (op - ostart);
}
lib/zstd_static.h
+9 -1
View File
@@ -98,9 +98,17 @@ ZSTDLIB_API size_t ZSTD_compress_advanced (ZSTD_CCtx* ctx,
const void* src, size_t srcSize,
ZSTD_parameters params);
/** ZSTD_compress_usingDict
* Same as ZSTD_compressCCtx(), using a Dictionary content as prefix */
ZSTDLIB_API size_t ZSTD_compress_usingDict(ZSTD_CCtx* ctx,
void* dst, size_t maxDstSize,
const void* src, size_t srcSize,
const void* dict,size_t dictSize,
int compressionLevel);
/* **************************************
* Streaming functions (bufferless mode)
* Streaming functions (direct mode)
****************************************/
ZSTDLIB_API size_t ZSTD_compressBegin(ZSTD_CCtx* cctx, void* dst, size_t maxDstSize, int compressionLevel);
ZSTDLIB_API size_t ZSTD_compressBegin_advanced(ZSTD_CCtx* ctx, void* dst, size_t maxDstSize, ZSTD_parameters params);