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Add new mergeGeneratedSequences() function

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senhuang42 2020-11-06 10:52:34 -05:00
parent f782cac3d4
commit 261ea69661
1 changed files with 15 additions and 9 deletions
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24
lib/zstd.h
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@ -1304,23 +1304,29 @@ typedef enum {
/*! ZSTD_getSequences() :
* Extract sequences from the sequence store.
* If invoked with ZSTD_sf_explicitBlockDelimiters, each block will end with a dummy sequence
* with offset == 0, matchLength == 0, and litLength == length of last literals.
*
* If invoked with ZSTD_sf_noBlockDelimiters, sequences will still be internally generated
* on a per-block basis, but any last literals of a block will be merged into the
* last literals of the first sequence in the next block.
* As such, the final generated result has no explicit representation of block boundaries,
* and the final last literals segment is not represented in the sequences.
* Each block will end with a dummy sequence
* with offset == 0, matchLength == 0, and litLength == length of last literals.
*
* zc can be used to insert custom compression params.
* This function invokes ZSTD_compress2
* @return : number of sequences extracted
* @return : number of sequences generated
*/
ZSTDLIB_API size_t ZSTD_getSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
size_t outSeqsSize, const void* src, size_t srcSize, ZSTD_sequenceFormat_e format);
size_t outSeqsSize, const void* src, size_t srcSize);
/*! ZSTD_mergeGeneratedSequences() :
* Convert an array of ZSTD_Sequence in the representation specified in ZSTD_getSequences()
* and merge all "dummy" sequences that represent last literals and block boundaries.
*
* Any last literals in the block will be merged into the literals of the next sequence.
*
* As such, the final generated result has no explicit representation of block boundaries,
* and the final last literals segment is not represented in the sequences.
* @return : number of sequences in final result
*/
ZSTDLIB_API size_t ZSTD_mergeGeneratedSequences(ZSTD_Sequence* sequences, size_t seqsSize);
/***************************************
* Memory management