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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /contrib/ltree/crc32.c | |
parent | Initial commit. (diff) | |
download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'contrib/ltree/crc32.c')
-rw-r--r-- | contrib/ltree/crc32.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/contrib/ltree/crc32.c b/contrib/ltree/crc32.c new file mode 100644 index 0000000..8fed334 --- /dev/null +++ b/contrib/ltree/crc32.c @@ -0,0 +1,39 @@ +/* contrib/ltree/crc32.c */ + +/* + * Implements CRC-32, as used in ltree. + * + * Note that the CRC is used in the on-disk format of GiST indexes, so we + * must stay backwards-compatible! + */ + +#include "postgres.h" + +#ifdef LOWER_NODE +#include <ctype.h> +#define TOLOWER(x) tolower((unsigned char) (x)) +#else +#define TOLOWER(x) (x) +#endif + +#include "crc32.h" +#include "utils/pg_crc.h" + +unsigned int +ltree_crc32_sz(const char *buf, int size) +{ + pg_crc32 crc; + const char *p = buf; + + INIT_TRADITIONAL_CRC32(crc); + while (size > 0) + { + char c = (char) TOLOWER(*p); + + COMP_TRADITIONAL_CRC32(crc, &c, 1); + size--; + p++; + } + FIN_TRADITIONAL_CRC32(crc); + return (unsigned int) crc; +} |