ddidderr/zstd-rs
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This commit is contained in:
Yann Collet
2016-05-20 14:36:36 +02:00
parent 45f84ab7cc
commit f22a0d653d
7 changed files with 153 additions and 126 deletions
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lib/compress/fse_compress.c
+8 -3
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@@ -442,7 +442,7 @@ FSE_CTable* FSE_createCTable (unsigned maxSymbolValue, unsigned tableLog)
return (FSE_CTable*)malloc(size);
}
void FSE_freeCTable (FSE_CTable* ct) { free(ct); }
void FSE_freeCTable (FSE_CTable* ct) { free(ct); }
/* provides the minimum logSize to safely represent a distribution */
static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue)
@@ -453,9 +453,9 @@ static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue)
return minBits;
}
unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus)
{
U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - 2;
U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - minus;
U32 tableLog = maxTableLog;
U32 minBits = FSE_minTableLog(srcSize, maxSymbolValue);
if (tableLog==0) tableLog = FSE_DEFAULT_TABLELOG;
@@ -466,6 +466,11 @@ unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxS
return tableLog;
}
unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
{
return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 2);
}
/* Secondary normalization method.
To be used when primary method fails. */