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Add an hts_crc32 function to use zlib or libdeflate. #1850

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Add an hts_crc32 function to use zlib or libdeflate. #1850

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8 changes: 8 additions & 0 deletions bgzf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -548,6 +548,10 @@ BGZF *bgzf_hopen(hFILE *hfp, const char *mode)
}

#ifdef HAVE_LIBDEFLATE
uint32_t hts_crc32(uint32_t crc, const void *buf, size_t len) {
return libdeflate_crc32(crc, buf, len);
}

int bgzf_compress(void *_dst, size_t *dlen, const void *src, size_t slen, int level)
{
if (slen == 0) {
Expand Down Expand Up @@ -607,6 +611,10 @@ int bgzf_compress(void *_dst, size_t *dlen, const void *src, size_t slen, int le

#else

uint32_t hts_crc32(uint32_t crc, const void *buf, size_t len) {
return crc32(crc, buf, len);
}

int bgzf_compress(void *_dst, size_t *dlen, const void *src, size_t slen, int level)
{
uint32_t crc;
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8 changes: 8 additions & 0 deletions htslib/hts.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1517,6 +1517,14 @@ static inline int hts_bin_level(int bin) {
return l;
}

/**************************************
* Exposing the CRC32 implementation *
* Either from zlib or libdeflate. *
*************************************/
HTSLIB_EXPORT
uint32_t hts_crc32(uint32_t crc, const void *buf, size_t len);


//! Compute the corresponding entry into the linear index of a given bin from
//! a binning index
/*!
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