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code to compare strings with entries in ziplist, regardless of their encoding

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This commit is contained in:
Pieter Noordhuis 2010-05-22 16:25:06 +02:00
parent 75d8978e7a
commit c09c2c3b04
1 changed files with 47 additions and 1 deletions
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48
ziplist.c
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@ -365,6 +365,28 @@ unsigned char *ziplistDelete(unsigned char *zl, unsigned char **p) {
return zl;
}
/* Compare entry pointer to by 'p' with 'entry'. Return 1 if equal. */
unsigned int ziplistCompare(unsigned char *p, unsigned char *entry, unsigned int elen) {
unsigned int zlen, lensize;
char encoding;
long long zval, eval;
if (*p == ZIP_END) return 0;
zlen = zipDecodeLength(p,&lensize);
if (zipTryEncoding(entry,&eval,&encoding)) {
/* Do integer compare */
zval = zipLoadInteger(p+lensize,ZIP_ENCODING(p));
return zval == eval;
} else {
/* Raw compare */
if (zlen == elen) {
return memcmp(p+lensize,entry,elen) == 0;
} else {
return 0;
}
}
}
void ziplistRepr(unsigned char *zl) {
unsigned char *p, encoding;
unsigned int l, lsize;
@ -557,7 +579,31 @@ int main(int argc, char **argv) {
}
printf("\n");
ziplistRepr(zl);
printf("\n");
}
printf("Compare strings with ziplist entries:\n");
{
zl = createList();
p = ziplistIndex(zl, 0);
if (!ziplistCompare(p,"hello",5)) {
printf("ERROR\n");
return;
}
if (ziplistCompare(p,"hella",5)) {
printf("ERROR\n");
return;
}
p = ziplistIndex(zl, 3);
if (!ziplistCompare(p,"1024",4)) {
printf("ERROR\n");
return;
}
if (ziplistCompare(p,"1025",4)) {
printf("ERROR\n");
return;
}
printf("SUCCESS\n");
}
return 0;