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zipampDel() implemented

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antirez 2010-03-03 16:59:44 +01:00
parent 2f4d2242ea
commit cd5a96eeda
1 changed files with 29 additions and 1 deletions
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30
zipmap.c
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@ -147,7 +147,7 @@ static unsigned int zipmapEncodeLength(unsigned char *p, unsigned int len) {
static unsigned char *zipmapLookupRaw(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned int *totlen, unsigned int *freeoff, unsigned int *freelen) { static unsigned char *zipmapLookupRaw(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned int *totlen, unsigned int *freeoff, unsigned int *freelen) {
unsigned char *p = zm+1; unsigned char *p = zm+1;
unsigned int l; unsigned int l;
unsigned int reqfreelen; unsigned int reqfreelen = 0; /* initialized just to prevent warning */
if (freelen) { if (freelen) {
reqfreelen = *freelen; reqfreelen = *freelen;
@ -210,6 +210,15 @@ static unsigned int zipmapRawValueLength(unsigned char *p) {
return used; return used;
} }
/* If 'p' points to a key, this function returns the total amount of
* bytes used to store this entry (entry = key + associated value + trailing
* free space if any). */
static unsigned int zipmapRawEntryLength(unsigned char *p) {
unsigned int l = zipmapRawKeyLength(p);
return l + zipmapRawValueLength(p+l);
}
/* Set key to value, creating the key if it does not already exist. */ /* Set key to value, creating the key if it does not already exist. */
unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char *val, unsigned int vlen) { unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int klen, unsigned char *val, unsigned int vlen) {
unsigned int oldlen = 0, freeoff = 0, freelen; unsigned int oldlen = 0, freeoff = 0, freelen;
@ -278,6 +287,23 @@ unsigned char *zipmapSet(unsigned char *zm, unsigned char *key, unsigned int kle
return zm; return zm;
} }
/* Remove the specified key. If 'deleted' is not NULL the pointed integer is
* set to 0 if the key was not found, to 1 if it was found and deleted. */
unsigned char *zipmapDel(unsigned char *zm, unsigned char *key, unsigned int klen, int *deleted) {
unsigned char *p = zipmapLookupRaw(zm,key,klen,NULL,NULL,NULL);
if (p) {
unsigned int freelen = zipmapRawEntryLength(p);
p[0] = ZIPMAP_EMPTY;
zipmapEncodeLength(p+1,freelen);
zm[0] |= ZIPMAP_STATUS_FRAGMENTED;
if (deleted) *deleted = 1;
} else {
if (deleted) *deleted = 0;
}
return zm;
}
void zipmapRepr(unsigned char *p) { void zipmapRepr(unsigned char *p) {
unsigned int l; unsigned int l;
@ -327,5 +353,7 @@ int main(void) {
zipmapRepr(zm); zipmapRepr(zm);
zm = zipmapSet(zm,(unsigned char*) "new",3, (unsigned char*) "xx",2); zm = zipmapSet(zm,(unsigned char*) "new",3, (unsigned char*) "xx",2);
zipmapRepr(zm); zipmapRepr(zm);
zm = zipmapDel(zm,(unsigned char*) "new",3,NULL);
zipmapRepr(zm);
return 0; return 0;
} }