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Introduced FSE_compress_wksp() and FSE_buildCTable_wksp() to reduce stack memory usage

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Yann Collet
2016-11-30 15:52:20 -08:00
parent 4ab3a4228f
commit d79a9a00d9
4 changed files with 90 additions and 55 deletions
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lib/common/fse.h
+13
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@@ -300,12 +300,25 @@ size_t FSE_countFast(unsigned* count, unsigned* maxSymbolValuePtr, const void* s
unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus);
/**< same as FSE_optimalTableLog(), which used `minus==2` */
/* FSE_compress_wksp() :
* Same as FSE_compress2(), but using an externally allocated scratch buffer (`workSpace`).
* `workSpace` size must be `(1<<tableLog)`.
*/
size_t FSE_compress_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace);
size_t FSE_buildCTable_raw (FSE_CTable* ct, unsigned nbBits);
/**< build a fake FSE_CTable, designed to not compress an input, where each symbol uses nbBits */
size_t FSE_buildCTable_rle (FSE_CTable* ct, unsigned char symbolValue);
/**< build a fake FSE_CTable, designed to compress always the same symbolValue */
/* FSE_buildCTable_wksp() :
* Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`).
* wkspSize should be sized to handle worst case situation, which is `(1<<max_tableLog) * sizeof(FSE_FUNCTION_TYPE)`.
* workSpace must also be properly aligned with FSE_FUNCTION_TYPE requirements.
*/
size_t FSE_buildCTable_wksp(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize);
size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits);
/**< build a fake FSE_DTable, designed to read an uncompressed bitstream where each symbol uses nbBits */