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Merge pull request #3262 from daniellerozenblit/sequence-bound

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Add sequenceBound(srcSize) method
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daniellerozenblit 2022-09-09 17:40:42 -04:00 committed by GitHub
commit 74ece5037c
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3 changed files with 14 additions and 3 deletions
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4
contrib/seqBench/seqBench.c
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@ -22,9 +22,7 @@ int main(int argc, char *argv[]) {
fread(inBuf, inBufSize, 1, f);
fclose(f);
// Should work fine for this benchmark, but we really need
// a function like ZSTD_compressBound() for sequences
size_t seqsSize = 2 * (inBufSize / sizeof(ZSTD_Sequence));
size_t seqsSize = ZSTD_sequenceBound(inBufSize);
ZSTD_Sequence *seqs = (ZSTD_Sequence*)malloc(seqsSize * sizeof(ZSTD_Sequence));
char *outBuf = malloc(ZSTD_compressBound(inBufSize));

4
lib/compress/zstd_compress.c
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@ -3003,6 +3003,10 @@ static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
zc->seqCollector.seqIndex += seqStoreSeqSize;
}
size_t ZSTD_sequenceBound(size_t srcSize) {
return (srcSize / ZSTD_MINMATCH_MIN) + 1;
}
size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
size_t outSeqsSize, const void* src, size_t srcSize)
{

9
lib/zstd.h
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@ -1396,6 +1396,15 @@ typedef enum {
ZSTD_sf_explicitBlockDelimiters = 1 /* Representation of ZSTD_Sequence contains explicit block delimiters */
} ZSTD_sequenceFormat_e;
/*! ZSTD_sequenceBound() :
* `srcSize` : size of the input buffer
* @return : upper-bound for the number of sequences that can be generated
* from a buffer of srcSize bytes
*
* note : returns number of sequences - to get bytes, multiply by sizeof(ZSTD_Sequence).
*/
ZSTDLIB_STATIC_API size_t ZSTD_sequenceBound(size_t srcSize);
/*! ZSTD_generateSequences() :
* Generate sequences using ZSTD_compress2(), given a source buffer.
*