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util/mesa_sha1: add helper to reconvert sha1 hex strings

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Converts the sha1 hex string representation back into its original
more compact format.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7725>
This commit is contained in:
Timothy Arceri 2021-02-10 17:05:24 +11:00 • committed by Marge Bot
parent f88c13f26d
commit 1fabc4ecbe
2 changed files with 18 additions and 0 deletions
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15
src/util/mesa-sha1.c
View file

@ -49,3 +49,18 @@ _mesa_sha1_format(char *buf, const unsigned char *sha1)
}
buf[i] = '\0';
}
/* Convert a hashs string hexidecimal representation into its more compact
* form.
*/
void
_mesa_sha1_hex_to_sha1(unsigned char *buf, const char *hex)
{
for (unsigned i = 0; i < 20; i++) {
char tmp[3];
tmp[0] = hex[i * 2];
tmp[1] = hex[(i * 2) + 1];
tmp[2] = '\0';
buf[i] = strtol(tmp, NULL, 16);
}
}

3
src/util/mesa-sha1.h
View file

@ -54,6 +54,9 @@ _mesa_sha1_final(struct mesa_sha1 *ctx, unsigned char result[20])
void
_mesa_sha1_format(char *buf, const unsigned char *sha1);
void
_mesa_sha1_hex_to_sha1(unsigned char *buf, const char *hex);
void
_mesa_sha1_compute(const void *data, size_t size, unsigned char result[20]);