From 6eb9c5a5657d1fe77b55cc261450f3538d35a94d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 14:19:15 +0200 Subject: Adding upstream version 13.4. Signed-off-by: Daniel Baumann --- contrib/ltree/crc32.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 contrib/ltree/crc32.c (limited to 'contrib/ltree/crc32.c') 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 +#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; +} -- cgit v1.2.3