-
-#define BITOP_AND 0
-#define BITOP_OR 1
-#define BITOP_XOR 2
-#define BITOP_NOT 3
-/* BITOP op_name target_key src_key1 src_key2 src_key3 ... src_keyN */
-void bitopCommand(redisClient *c) {
- char *opname = c->argv[1]->ptr;
- robj *o, *targetkey = c->argv[2];
- long op, j, numkeys;
- unsigned char **src; /* Array of source strings pointers. */
- long *len, maxlen = 0; /* Array of length of src strings, and max len. */
- unsigned char *res = NULL; /* Resulting string. */
-
- /* Parse the operation name. */
- if ((opname[0] == 'a' || opname[0] == 'A') && !strcasecmp(opname,"and"))
- op = BITOP_AND;
- else if((opname[0] == 'o' || opname[0] == 'O') && !strcasecmp(opname,"or"))
- op = BITOP_OR;
- else if((opname[0] == 'x' || opname[0] == 'X') && !strcasecmp(opname,"xor"))
- op = BITOP_XOR;
- else if((opname[0] == 'n' || opname[0] == 'N') && !strcasecmp(opname,"not"))
- op = BITOP_NOT;
- else {
- addReply(c,shared.syntaxerr);
- return;
- }
-
- /* Sanity check: NOT accepts only a single key argument. */
- if (op == BITOP_NOT && c->argc != 4) {
- addReplyError(c,"BITOP NOT must be called with a single source key.");
- return;
- }
-
- /* Lookup keys, and store pointers to the string objects into an array. */
- numkeys = c->argc - 3;
- src = zmalloc(sizeof(unsigned char*) * numkeys);
- len = zmalloc(sizeof(long) * numkeys);
- for (j = 0; j < numkeys; j++) {
- o = lookupKeyRead(c->db,c->argv[j+3]);
- /* Handle non-existing keys as empty strings. */
- if (o == NULL) {
- src[j] = NULL;
- len[j] = 0;
- continue;
- }
- /* Return an error if one of the keys is not a string. */
- if (checkType(c,o,REDIS_STRING)) {
- zfree(src);
- zfree(len);
- return;
- }
- src[j] = o->ptr;
- len[j] = sdslen(o->ptr);
- if (len[j] > maxlen) maxlen = len[j];
- }
-
- /* Compute the bit operation, if at least one string is not empty. */
- if (maxlen) {
- res = (unsigned char*) sdsnewlen(NULL,maxlen);
- unsigned char output, byte;
- long i;
-
- for (j = 0; j < maxlen; j++) {
- output = (len[0] <= j) ? 0 : src[0][j];
- if (op == BITOP_NOT) output = ~output;
- for (i = 1; i < numkeys; i++) {
- byte = (len[i] <= j) ? 0 : src[i][j];
- switch(op) {
- case BITOP_AND: output &= byte; break;
- case BITOP_OR: output |= byte; break;
- case BITOP_XOR: output ^= byte; break;
- }
- }
- res[j] = output;
- }
- }
- zfree(src);
- zfree(len);
-
- /* Store the computed value into the target key */
- if (maxlen) {
- o = createObject(REDIS_STRING,res);
- setKey(c->db,targetkey,o);
- decrRefCount(o);
- } else if (dbDelete(c->db,targetkey)) {
- signalModifiedKey(c->db,targetkey);
- }
- server.dirty++;
- addReplyLongLong(c,maxlen); /* Return the output string length in bytes. */
-}
-
-/* BITCOUNT key [start end] */
-void bitcountCommand(redisClient *c) {
- static const unsigned char bitsinbyte[256] = {0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8};
- robj *o;
- long start, end;
- unsigned char *p;
- char llbuf[32];
- size_t strlen;
-
- /* Lookup, check for type, and return 0 for non existing keys. */
- if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
- checkType(c,o,REDIS_STRING)) return;
-
- /* Set the 'p' pointer to the string, that can be just a stack allocated
- * array if our string was integer encoded. */
- if (o->encoding == REDIS_ENCODING_INT) {
- p = (unsigned char*) llbuf;
- strlen = ll2string(llbuf,sizeof(llbuf),(long)o->ptr);
- } else {
- p = (unsigned char*) o->ptr;
- strlen = sdslen(o->ptr);
- }
-
- /* Parse start/end range if any. */
- if (c->argc == 4) {
- if (getLongFromObjectOrReply(c,c->argv[2],&start,NULL) != REDIS_OK)
- return;
- if (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != REDIS_OK)
- return;
- /* Convert negative indexes */
- if (start < 0) start = strlen+start;
- if (end < 0) end = strlen+end;
- if (start < 0) start = 0;
- if (end < 0) end = 0;
- if ((unsigned)end >= strlen) end = strlen-1;
- } else if (c->argc == 2) {
- /* The whole string. */
- start = 0;
- end = strlen-1;
- } else {
- /* Syntax error. */
- addReply(c,shared.syntaxerr);
- return;
- }
-
- /* Precondition: end >= 0 && end < strlen, so the only condition where
- * zero can be returned is: start > end. */
- if (start > end) {
- addReply(c,shared.czero);
- } else {
- long bits = 0, bytes = end-start+1;
-
- /* We can finally count bits. */
- p += start;
- while(bytes--) bits += bitsinbyte[*p++];
- addReplyLongLong(c,bits);
- }
-}
projects / redis.git / blobdiff