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tinf_adler32(): Allow to work in incremental manner.

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By letting passing in previously calculated partial checksum.
This commit is contained in:
Paul Sokolovsky 2016-08-06 00:14:09 +03:00
parent f99e297389
commit e200028869
2 changed files with 4 additions and 4 deletions
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6
src/adler32.c
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@ -41,12 +41,12 @@
#define A32_BASE 65521
#define A32_NMAX 5552
unsigned int tinf_adler32(const void *data, unsigned int length)
unsigned int tinf_adler32(const void *data, unsigned int length, unsigned int prev_sum /* 1 */)
{
const unsigned char *buf = (const unsigned char *)data;
unsigned int s1 = 1;
unsigned int s2 = 0;
unsigned int s1 = prev_sum & 0xffff;
unsigned int s2 = prev_sum >> 16;
while (length > 0)
{

2
src/tinf.h
View file

@ -106,7 +106,7 @@ int tinf_gzip_parse_trailer(TINF_GZIP_INFO *gz, const unsigned char **source, un
int TINFCC tinf_zlib_uncompress(void *dest, unsigned int *destLen,
const void *source, unsigned int sourceLen);
unsigned int TINFCC tinf_adler32(const void *data, unsigned int length);
unsigned int TINFCC tinf_adler32(const void *data, unsigned int length, unsigned int prev_sum /* 1 */);
unsigned int TINFCC tinf_crc32(const void *data, unsigned int length);