#define INTSET_ENC_INT32 (sizeof(int32_t))
#define INTSET_ENC_INT64 (sizeof(int64_t))
-/* Accessors for each type of encoding */
-#define INTSET_VALUE_ENCODING(__val) (((__val) < INT32_MIN || (__val) > INT32_MAX) ? \
- INTSET_ENC_INT64 : (((__val) < INT16_MIN || (__val) > INT16_MAX) ? \
- INTSET_ENC_INT32 : INTSET_ENC_INT16))
-#define INTSET_GET_ENCODED(__is,__pos,__enc) ((__enc == INTSET_ENC_INT64) ? \
- ((int64_t*)(__is)->contents)[__pos] : ((__enc == INTSET_ENC_INT32) ? \
- ((int32_t*)(__is)->contents)[__pos] : ((int16_t*)(__is)->contents)[__pos]))
-#define INTSET_GET(__is,__pos) (INTSET_GET_ENCODED(__is,__pos,(__is)->encoding))
-#define INTSET_SET(__is,__pos,__val) { \
- if ((__is)->encoding == INTSET_ENC_INT64) \
- ((int64_t*)(__is)->contents)[__pos] = (__val); \
- else if ((__is)->encoding == INTSET_ENC_INT32) \
- ((int32_t*)(__is)->contents)[__pos] = (__val); \
- else \
- ((int16_t*)(__is)->contents)[__pos] = (__val); }
+/* Return the required encoding for the provided value. */
+static uint8_t _intsetValueEncoding(int64_t v) {
+ if (v < INT32_MIN || v > INT32_MAX)
+ return INTSET_ENC_INT64;
+ else if (v < INT16_MIN || v > INT16_MAX)
+ return INTSET_ENC_INT32;
+ return INTSET_ENC_INT16;
+}
+
+/* Return the value at pos, given an encoding. */
+static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
+ if (enc == INTSET_ENC_INT64)
+ return ((int64_t*)is->contents)[pos];
+ else if (enc == INTSET_ENC_INT32)
+ return ((int32_t*)is->contents)[pos];
+ return ((int16_t*)is->contents)[pos];
+}
+
+/* Return the value at pos, using the configured encoding. */
+static int64_t _intsetGet(intset *is, int pos) {
+ return _intsetGetEncoded(is,pos,is->encoding);
+}
+
+/* Set the value at pos, using the configured encoding. */
+static void _intsetSet(intset *is, int pos, int64_t value) {
+ if (is->encoding == INTSET_ENC_INT64)
+ ((int64_t*)is->contents)[pos] = value;
+ else if (is->encoding == INTSET_ENC_INT32)
+ ((int32_t*)is->contents)[pos] = value;
+ else
+ ((int16_t*)is->contents)[pos] = value;
+}
/* Create an empty intset. */
intset *intsetNew(void) {
return is;
}
-static intset *intsetUpgrade(intset *is, uint8_t newenc, uint8_t extra, uint8_t offset) {
- uint8_t curenc = is->encoding;
- int length = is->length;
-
- /* First set new encoding and resize */
- is->encoding = newenc;
- is = intsetResize(is,is->length+extra);
-
- /* Upgrade back-to-front so we don't overwrite values */
- while(length--)
- INTSET_SET(is,length+offset,INTSET_GET_ENCODED(is,length,curenc));
- return is;
-}
-
/* Search for the position of "value". Return 1 when the value was found and
* sets "pos" to the position of the value within the intset. Return 0 when
* the value is not present in the intset and sets "pos" to the position
} else {
/* Check for the case where we know we cannot find the value,
* but do know the insert position. */
- if (value > INTSET_GET(is,is->length-1)) {
+ if (value > _intsetGet(is,is->length-1)) {
if (pos) *pos = is->length;
return 0;
- } else if (value < INTSET_GET(is,0)) {
+ } else if (value < _intsetGet(is,0)) {
if (pos) *pos = 0;
return 0;
}
while(max >= min) {
mid = (min+max)/2;
- cur = INTSET_GET(is,mid);
+ cur = _intsetGet(is,mid);
if (value > cur) {
min = mid+1;
} else if (value < cur) {
}
}
+/* Upgrades the intset to a larger encoding and inserts the given integer. */
+static intset *intsetUpgradeAndAdd(intset *is, int64_t value) {
+ uint8_t curenc = is->encoding;
+ uint8_t newenc = _intsetValueEncoding(value);
+ int length = is->length;
+ int prepend = value < 0 ? 1 : 0;
+
+ /* First set new encoding and resize */
+ is->encoding = newenc;
+ is = intsetResize(is,is->length+1);
+
+ /* Upgrade back-to-front so we don't overwrite values.
+ * Note that the "prepend" variable is used to make sure we have an empty
+ * space at either the beginning or the end of the intset. */
+ while(length--)
+ _intsetSet(is,length+prepend,_intsetGetEncoded(is,length,curenc));
+
+ /* Set the value at the beginning or the end. */
+ if (prepend)
+ _intsetSet(is,0,value);
+ else
+ _intsetSet(is,is->length,value);
+ is->length++;
+ return is;
+}
+
static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
void *src, *dst;
uint32_t bytes = is->length-from;
/* Insert an integer in the intset */
intset *intsetAdd(intset *is, int64_t value, uint8_t *success) {
- uint8_t valenc = INTSET_VALUE_ENCODING(value);
- uint32_t pos, offset;
+ uint8_t valenc = _intsetValueEncoding(value);
+ uint32_t pos;
if (success) *success = 1;
/* Upgrade encoding if necessary. If we need to upgrade, we know that
* this value should be either appended (if > 0) or prepended (if < 0),
* because it lies outside the range of existing values. */
if (valenc > is->encoding) {
- offset = value < 0 ? 1 : 0;
- is = intsetUpgrade(is,valenc,1,offset);
- pos = (value < 0) ? 0 : is->length;
+ /* This always succeeds, so we don't need to curry *success. */
+ return intsetUpgradeAndAdd(is,value);
} else {
/* Abort if the value is already present in the set.
* This call will populate "pos" with the right position to insert
if (pos < is->length) intsetMoveTail(is,pos,pos+1);
}
- INTSET_SET(is,pos,value);
+ _intsetSet(is,pos,value);
is->length++;
return is;
}
/* Delete integer from intset */
intset *intsetRemove(intset *is, int64_t value, uint8_t *success) {
- uint8_t valenc = INTSET_VALUE_ENCODING(value);
+ uint8_t valenc = _intsetValueEncoding(value);
uint32_t pos;
if (success) *success = 0;
/* Determine whether a value belongs to this set */
uint8_t intsetFind(intset *is, int64_t value) {
- uint8_t valenc = INTSET_VALUE_ENCODING(value);
+ uint8_t valenc = _intsetValueEncoding(value);
return valenc <= is->encoding && intsetSearch(is,value,NULL);
}
/* Return random member */
int64_t intsetRandom(intset *is) {
- return INTSET_GET(is,rand()%is->length);
+ return _intsetGet(is,rand()%is->length);
}
/* Sets the value to the value at the given position. When this position is
* out of range the function returns 0, when in range it returns 1. */
uint8_t intsetGet(intset *is, uint32_t pos, int64_t *value) {
if (pos < is->length) {
- *value = INTSET_GET(is,pos);
+ *value = _intsetGet(is,pos);
return 1;
}
return 0;
void intsetRepr(intset *is) {
int i;
for (i = 0; i < is->length; i++) {
- printf("%lld\n", (uint64_t)INTSET_GET(is,i));
+ printf("%lld\n", (uint64_t)_intsetGet(is,i));
}
printf("\n");
}
sranddev();
printf("Value encodings: "); {
- assert(INTSET_VALUE_ENCODING(-32768) == INTSET_ENC_INT16);
- assert(INTSET_VALUE_ENCODING(+32767) == INTSET_ENC_INT16);
- assert(INTSET_VALUE_ENCODING(-32769) == INTSET_ENC_INT32);
- assert(INTSET_VALUE_ENCODING(+32768) == INTSET_ENC_INT32);
- assert(INTSET_VALUE_ENCODING(-2147483648) == INTSET_ENC_INT32);
- assert(INTSET_VALUE_ENCODING(+2147483647) == INTSET_ENC_INT32);
- assert(INTSET_VALUE_ENCODING(-2147483649) == INTSET_ENC_INT64);
- assert(INTSET_VALUE_ENCODING(+2147483648) == INTSET_ENC_INT64);
- assert(INTSET_VALUE_ENCODING(-9223372036854775808ull) == INTSET_ENC_INT64);
- assert(INTSET_VALUE_ENCODING(+9223372036854775807ull) == INTSET_ENC_INT64);
+ assert(_intsetValueEncoding(-32768) == INTSET_ENC_INT16);
+ assert(_intsetValueEncoding(+32767) == INTSET_ENC_INT16);
+ assert(_intsetValueEncoding(-32769) == INTSET_ENC_INT32);
+ assert(_intsetValueEncoding(+32768) == INTSET_ENC_INT32);
+ assert(_intsetValueEncoding(-2147483648) == INTSET_ENC_INT32);
+ assert(_intsetValueEncoding(+2147483647) == INTSET_ENC_INT32);
+ assert(_intsetValueEncoding(-2147483649) == INTSET_ENC_INT64);
+ assert(_intsetValueEncoding(+2147483648) == INTSET_ENC_INT64);
+ assert(_intsetValueEncoding(-9223372036854775808ull) == INTSET_ENC_INT64);
+ assert(_intsetValueEncoding(+9223372036854775807ull) == INTSET_ENC_INT64);
ok();
}
projects / redis.git / blobdiff