Function zipmapNext

src/zipmap.c:319–334

This function is used to iterate through all the zipmap elements. * In the first call the first argument is the pointer to the zipmap + 1. * In the next calls what zipmapNext returns is used as first argument. * Example: * * unsigned char *i = zipmapRewind(my_zipmap); * while((i = zipmapNext(i,&key,&klen,&value,&vlen)) != NULL) { * printf("%d bytes key at $p\n", klen, key); * print

 * }
 */
unsigned char *zipmapNext(unsigned char *zm, unsigned char **key, unsigned int *klen, unsigned char **value, unsigned int *vlen) {
    if (zm[0] == ZIPMAP_END) return NULL;
    if (key) {
        *key = zm;
        *klen = zipmapDecodeLength(zm);
        *key += ZIPMAP_LEN_BYTES(*klen);
    }
    zm += zipmapRawKeyLength(zm);
    if (value) {
        *value = zm+1;
        *vlen = zipmapDecodeLength(zm);
        *value += ZIPMAP_LEN_BYTES(*vlen);
    }
    zm += zipmapRawValueLength(zm);
    return zm;
}

/* Search a key and retrieve the pointer and len of the associated value.
 * If the key is found the function returns 1, otherwise 0. */