src/intset.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "intset.h"
#include "zmalloc.h"
#include "endianconv.h"

/* Note that these encodings are ordered, so:
 * INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
#define INTSET_ENC_INT16 (sizeof(int16_t))
#define INTSET_ENC_INT32 (sizeof(int32_t))
#define INTSET_ENC_INT64 (sizeof(int64_t))

/* 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;
    else
        return INTSET_ENC_INT16;
}

/* Return the value at pos, given an encoding. */
static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
    int64_t v64;
    int32_t v32;
    int16_t v16;

    if (enc == INTSET_ENC_INT64) {
        memcpy(&v64,((int64_t*)is->contents)+pos,sizeof(v64));
        memrev64ifbe(&v64);
        return v64;
    } else if (enc == INTSET_ENC_INT32) {
        memcpy(&v32,((int32_t*)is->contents)+pos,sizeof(v32));
        memrev32ifbe(&v32);
        return v32;
    } else {
        memcpy(&v16,((int16_t*)is->contents)+pos,sizeof(v16));
        memrev16ifbe(&v16);
        return v16;
    }
}

/* Return the value at pos, using the configured encoding. */
static int64_t _intsetGet(intset *is, int pos) {
    return _intsetGetEncoded(is,pos,intrev32ifbe(is->encoding));
}

/* Set the value at pos, using the configured encoding. */
static void _intsetSet(intset *is, int pos, int64_t value) {
    uint32_t encoding = intrev32ifbe(is->encoding);

    if (encoding == INTSET_ENC_INT64) {
        ((int64_t*)is->contents)[pos] = value;
        memrev64ifbe(((int64_t*)is->contents)+pos);
    } else if (encoding == INTSET_ENC_INT32) {
        ((int32_t*)is->contents)[pos] = value;
        memrev32ifbe(((int32_t*)is->contents)+pos);
    } else {
        ((int16_t*)is->contents)[pos] = value;
        memrev16ifbe(((int16_t*)is->contents)+pos);
    }
}

/* Create an empty intset. */
intset *intsetNew(void) {
    intset *is = zmalloc(sizeof(intset));
    is->encoding = intrev32ifbe(INTSET_ENC_INT16);
    is->length = 0;
    return is;
}

/* Resize the intset */
static intset *intsetResize(intset *is, uint32_t len) {
    uint32_t size = len*intrev32ifbe(is->encoding);
    is = zrealloc(is,sizeof(intset)+size);
    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
 * where "value" can be inserted. */
static uint8_t intsetSearch(intset *is, int64_t value, uint32_t *pos) {
    int min = 0, max = intrev32ifbe(is->length)-1, mid = -1;
    int64_t cur = -1;

    /* The value can never be found when the set is empty */
    if (intrev32ifbe(is->length) == 0) {
        if (pos) *pos = 0;
        return 0;
    } else {
        /* Check for the case where we know we cannot find the value,
         * but do know the insert position. */
        if (value > _intsetGet(is,intrev32ifbe(is->length)-1)) {
            if (pos) *pos = intrev32ifbe(is->length);
            return 0;
        } else if (value < _intsetGet(is,0)) {
            if (pos) *pos = 0;
            return 0;
        }
    }

    while(max >= min) {
        mid = (min+max)/2;
        cur = _intsetGet(is,mid);
        if (value > cur) {
            min = mid+1;
        } else if (value < cur) {
            max = mid-1;
        } else {
            break;
        }
    }

    if (value == cur) {
        if (pos) *pos = mid;
        return 1;
    } else {
        if (pos) *pos = min;
        return 0;
    }
}

/* Upgrades the intset to a larger encoding and inserts the given integer. */
static intset *intsetUpgradeAndAdd(intset *is, int64_t value) {
    uint8_t curenc = intrev32ifbe(is->encoding);
    uint8_t newenc = _intsetValueEncoding(value);
    int length = intrev32ifbe(is->length);
    int prepend = value < 0 ? 1 : 0;

    /* First set new encoding and resize */
    is->encoding = intrev32ifbe(newenc);
    is = intsetResize(is,intrev32ifbe(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,intrev32ifbe(is->length),value);
    is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
    return is;
}

static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
    void *src, *dst;
    uint32_t bytes = intrev32ifbe(is->length)-from;
    uint32_t encoding = intrev32ifbe(is->encoding);

    if (encoding == INTSET_ENC_INT64) {
        src = (int64_t*)is->contents+from;
        dst = (int64_t*)is->contents+to;
        bytes *= sizeof(int64_t);
    } else if (encoding == INTSET_ENC_INT32) {
        src = (int32_t*)is->contents+from;
        dst = (int32_t*)is->contents+to;
        bytes *= sizeof(int32_t);
    } else {
        src = (int16_t*)is->contents+from;
        dst = (int16_t*)is->contents+to;
        bytes *= sizeof(int16_t);
    }
    memmove(dst,src,bytes);
}

/* Insert an integer in the intset */
intset *intsetAdd(intset *is, int64_t value, uint8_t *success) {
    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 > intrev32ifbe(is->encoding)) {
        /* 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
         * the value when it cannot be found. */
        if (intsetSearch(is,value,&pos)) {
            if (success) *success = 0;
            return is;
        }

        is = intsetResize(is,intrev32ifbe(is->length)+1);
        if (pos < intrev32ifbe(is->length)) intsetMoveTail(is,pos,pos+1);
    }

    _intsetSet(is,pos,value);
    is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
    return is;
}

/* Delete integer from intset */
intset *intsetRemove(intset *is, int64_t value, int *success) {
    uint8_t valenc = _intsetValueEncoding(value);
    uint32_t pos;
    if (success) *success = 0;

    if (valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,&pos)) {
        uint32_t len = intrev32ifbe(is->length);

        /* We know we can delete */
        if (success) *success = 1;

        /* Overwrite value with tail and update length */
        if (pos < (len-1)) intsetMoveTail(is,pos+1,pos);
        is = intsetResize(is,len-1);
        is->length = intrev32ifbe(len-1);
    }
    return is;
}

/* Determine whether a value belongs to this set */
uint8_t intsetFind(intset *is, int64_t value) {
    uint8_t valenc = _intsetValueEncoding(value);
    return valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,NULL);
}

/* Return random member */
int64_t intsetRandom(intset *is) {
    return _intsetGet(is,rand()%intrev32ifbe(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 < intrev32ifbe(is->length)) {
        *value = _intsetGet(is,pos);
        return 1;
    }
    return 0;
}

/* Return intset length */
uint32_t intsetLen(intset *is) {
    return intrev32ifbe(is->length);
}

/* Return intset blob size in bytes. */
size_t intsetBlobLen(intset *is) {
    return sizeof(intset)+intrev32ifbe(is->length)*intrev32ifbe(is->encoding);
}

#ifdef INTSET_TEST_MAIN
#include <sys/time.h>

void intsetRepr(intset *is) {
    int i;
    for (i = 0; i < intrev32ifbe(is->length); i++) {
        printf("%lld\n", (uint64_t)_intsetGet(is,i));
    }
    printf("\n");
}

void error(char *err) {
    printf("%s\n", err);
    exit(1);
}

void ok(void) {
    printf("OK\n");
}

long long usec(void) {
    struct timeval tv;
    gettimeofday(&tv,NULL);
    return (((long long)tv.tv_sec)*1000000)+tv.tv_usec;
}

#define assert(_e) ((_e)?(void)0:(_assert(#_e,__FILE__,__LINE__),exit(1)))
void _assert(char *estr, char *file, int line) {
    printf("\n\n=== ASSERTION FAILED ===\n");
    printf("==> %s:%d '%s' is not true\n",file,line,estr);
}

intset *createSet(int bits, int size) {
    uint64_t mask = (1<<bits)-1;
    uint64_t i, value;
    intset *is = intsetNew();

    for (i = 0; i < size; i++) {
        if (bits > 32) {
            value = (rand()*rand()) & mask;
        } else {
            value = rand() & mask;
        }
        is = intsetAdd(is,value,NULL);
    }
    return is;
}

void checkConsistency(intset *is) {
    int i;

    for (i = 0; i < (intrev32ifbe(is->length)-1); i++) {
        uint32_t encoding = intrev32ifbe(is->encoding);

        if (encoding == INTSET_ENC_INT16) {
            int16_t *i16 = (int16_t*)is->contents;
            assert(i16[i] < i16[i+1]);
        } else if (encoding == INTSET_ENC_INT32) {
            int32_t *i32 = (int32_t*)is->contents;
            assert(i32[i] < i32[i+1]);
        } else {
            int64_t *i64 = (int64_t*)is->contents;
            assert(i64[i] < i64[i+1]);
        }
    }
}

int main(int argc, char **argv) {
    uint8_t success;
    int i;
    intset *is;
    sranddev();

    printf("Value encodings: "); {
        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();
    }

    printf("Basic adding: "); {
        is = intsetNew();
        is = intsetAdd(is,5,&success); assert(success);
        is = intsetAdd(is,6,&success); assert(success);
        is = intsetAdd(is,4,&success); assert(success);
        is = intsetAdd(is,4,&success); assert(!success);
        ok();
    }

    printf("Large number of random adds: "); {
        int inserts = 0;
        is = intsetNew();
        for (i = 0; i < 1024; i++) {
            is = intsetAdd(is,rand()%0x800,&success);
            if (success) inserts++;
        }
        assert(intrev32ifbe(is->length) == inserts);
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int16 to int32: "); {
        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
        is = intsetAdd(is,65535,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
        assert(intsetFind(is,32));
        assert(intsetFind(is,65535));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
        is = intsetAdd(is,-65535,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
        assert(intsetFind(is,32));
        assert(intsetFind(is,-65535));
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int16 to int64: "); {
        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
        is = intsetAdd(is,4294967295,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
        assert(intsetFind(is,32));
        assert(intsetFind(is,4294967295));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
        is = intsetAdd(is,-4294967295,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
        assert(intsetFind(is,32));
        assert(intsetFind(is,-4294967295));
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int32 to int64: "); {
        is = intsetNew();
        is = intsetAdd(is,65535,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
        is = intsetAdd(is,4294967295,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
        assert(intsetFind(is,65535));
        assert(intsetFind(is,4294967295));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,65535,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
        is = intsetAdd(is,-4294967295,NULL);
        assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
        assert(intsetFind(is,65535));
        assert(intsetFind(is,-4294967295));
        checkConsistency(is);
        ok();
    }

    printf("Stress lookups: "); {
        long num = 100000, size = 10000;
        int i, bits = 20;
        long long start;
        is = createSet(bits,size);
        checkConsistency(is);

        start = usec();
        for (i = 0; i < num; i++) intsetSearch(is,rand() % ((1<<bits)-1),NULL);
        printf("%ld lookups, %ld element set, %lldusec\n",num,size,usec()-start);
    }

    printf("Stress add+delete: "); {
        int i, v1, v2;
        is = intsetNew();
        for (i = 0; i < 0xffff; i++) {
            v1 = rand() % 0xfff;
            is = intsetAdd(is,v1,NULL);
            assert(intsetFind(is,v1));

            v2 = rand() % 0xfff;
            is = intsetRemove(is,v2,NULL);
            assert(!intsetFind(is,v2));
        }
        checkConsistency(is);
        ok();
    }
}
#endif
Commit	Line	Data
	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <string.h>
	4	#include "intset.h"
	5	#include "zmalloc.h"
	6	#include "endianconv.h"
	7
	8	/* Note that these encodings are ordered, so:
	9	* INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
	10	#define INTSET_ENC_INT16 (sizeof(int16_t))
	11	#define INTSET_ENC_INT32 (sizeof(int32_t))
	12	#define INTSET_ENC_INT64 (sizeof(int64_t))
	13
	14	/* Return the required encoding for the provided value. */
	15	static uint8_t _intsetValueEncoding(int64_t v) {
	16	if (v < INT32_MIN \|\| v > INT32_MAX)
	17	return INTSET_ENC_INT64;
	18	else if (v < INT16_MIN \|\| v > INT16_MAX)
	19	return INTSET_ENC_INT32;
	20	else
	21	return INTSET_ENC_INT16;
	22	}
	23
	24	/* Return the value at pos, given an encoding. */
	25	static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
	26	int64_t v64;
	27	int32_t v32;
	28	int16_t v16;
	29
	30	if (enc == INTSET_ENC_INT64) {
	31	memcpy(&v64,((int64_t*)is->contents)+pos,sizeof(v64));
	32	memrev64ifbe(&v64);
	33	return v64;
	34	} else if (enc == INTSET_ENC_INT32) {
	35	memcpy(&v32,((int32_t*)is->contents)+pos,sizeof(v32));
	36	memrev32ifbe(&v32);
	37	return v32;
	38	} else {
	39	memcpy(&v16,((int16_t*)is->contents)+pos,sizeof(v16));
	40	memrev16ifbe(&v16);
	41	return v16;
	42	}
	43	}
	44
	45	/* Return the value at pos, using the configured encoding. */
	46	static int64_t _intsetGet(intset *is, int pos) {
	47	return _intsetGetEncoded(is,pos,intrev32ifbe(is->encoding));
	48	}
	49
	50	/* Set the value at pos, using the configured encoding. */
	51	static void _intsetSet(intset *is, int pos, int64_t value) {
	52	uint32_t encoding = intrev32ifbe(is->encoding);
	53
	54	if (encoding == INTSET_ENC_INT64) {
	55	((int64_t*)is->contents)[pos] = value;
	56	memrev64ifbe(((int64_t*)is->contents)+pos);
	57	} else if (encoding == INTSET_ENC_INT32) {
	58	((int32_t*)is->contents)[pos] = value;
	59	memrev32ifbe(((int32_t*)is->contents)+pos);
	60	} else {
	61	((int16_t*)is->contents)[pos] = value;
	62	memrev16ifbe(((int16_t*)is->contents)+pos);
	63	}
	64	}
	65
	66	/* Create an empty intset. */
	67	intset *intsetNew(void) {
	68	intset *is = zmalloc(sizeof(intset));
	69	is->encoding = intrev32ifbe(INTSET_ENC_INT16);
	70	is->length = 0;
	71	return is;
	72	}
	73
	74	/* Resize the intset */
	75	static intset intsetResize(intset is, uint32_t len) {
	76	uint32_t size = len*intrev32ifbe(is->encoding);
	77	is = zrealloc(is,sizeof(intset)+size);
	78	return is;
	79	}
	80
	81	/* Search for the position of "value". Return 1 when the value was found and
	82	* sets "pos" to the position of the value within the intset. Return 0 when
	83	* the value is not present in the intset and sets "pos" to the position
	84	* where "value" can be inserted. */
	85	static uint8_t intsetSearch(intset is, int64_t value, uint32_t pos) {
	86	int min = 0, max = intrev32ifbe(is->length)-1, mid = -1;
	87	int64_t cur = -1;
	88
	89	/* The value can never be found when the set is empty */
	90	if (intrev32ifbe(is->length) == 0) {
	91	if (pos) *pos = 0;
	92	return 0;
	93	} else {
	94	/* Check for the case where we know we cannot find the value,
	95	* but do know the insert position. */
	96	if (value > _intsetGet(is,intrev32ifbe(is->length)-1)) {
	97	if (pos) *pos = intrev32ifbe(is->length);
	98	return 0;
	99	} else if (value < _intsetGet(is,0)) {
	100	if (pos) *pos = 0;
	101	return 0;
	102	}
	103	}
	104
	105	while(max >= min) {
	106	mid = (min+max)/2;
	107	cur = _intsetGet(is,mid);
	108	if (value > cur) {
	109	min = mid+1;
	110	} else if (value < cur) {
	111	max = mid-1;
	112	} else {
	113	break;
	114	}
	115	}
	116
	117	if (value == cur) {
	118	if (pos) *pos = mid;
	119	return 1;
	120	} else {
	121	if (pos) *pos = min;
	122	return 0;
	123	}
	124	}
	125
	126	/* Upgrades the intset to a larger encoding and inserts the given integer. */
	127	static intset intsetUpgradeAndAdd(intset is, int64_t value) {
	128	uint8_t curenc = intrev32ifbe(is->encoding);
	129	uint8_t newenc = _intsetValueEncoding(value);
	130	int length = intrev32ifbe(is->length);
	131	int prepend = value < 0 ? 1 : 0;
	132
	133	/* First set new encoding and resize */
	134	is->encoding = intrev32ifbe(newenc);
	135	is = intsetResize(is,intrev32ifbe(is->length)+1);
	136
	137	/* Upgrade back-to-front so we don't overwrite values.
	138	* Note that the "prepend" variable is used to make sure we have an empty
	139	* space at either the beginning or the end of the intset. */
	140	while(length--)
	141	_intsetSet(is,length+prepend,_intsetGetEncoded(is,length,curenc));
	142
	143	/* Set the value at the beginning or the end. */
	144	if (prepend)
	145	_intsetSet(is,0,value);
	146	else
	147	_intsetSet(is,intrev32ifbe(is->length),value);
	148	is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
	149	return is;
	150	}
	151
	152	static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
	153	void src, dst;
	154	uint32_t bytes = intrev32ifbe(is->length)-from;
	155	uint32_t encoding = intrev32ifbe(is->encoding);
	156
	157	if (encoding == INTSET_ENC_INT64) {
	158	src = (int64_t*)is->contents+from;
	159	dst = (int64_t*)is->contents+to;
	160	bytes *= sizeof(int64_t);
	161	} else if (encoding == INTSET_ENC_INT32) {
	162	src = (int32_t*)is->contents+from;
	163	dst = (int32_t*)is->contents+to;
	164	bytes *= sizeof(int32_t);
	165	} else {
	166	src = (int16_t*)is->contents+from;
	167	dst = (int16_t*)is->contents+to;
	168	bytes *= sizeof(int16_t);
	169	}
	170	memmove(dst,src,bytes);
	171	}
	172
	173	/* Insert an integer in the intset */
	174	intset intsetAdd(intset is, int64_t value, uint8_t *success) {
	175	uint8_t valenc = _intsetValueEncoding(value);
	176	uint32_t pos;
	177	if (success) *success = 1;
	178
	179	/* Upgrade encoding if necessary. If we need to upgrade, we know that
	180	* this value should be either appended (if > 0) or prepended (if < 0),
	181	* because it lies outside the range of existing values. */
	182	if (valenc > intrev32ifbe(is->encoding)) {
	183	/* This always succeeds, so we don't need to curry success. /
	184	return intsetUpgradeAndAdd(is,value);
	185	} else {
	186	/* Abort if the value is already present in the set.
	187	* This call will populate "pos" with the right position to insert
	188	* the value when it cannot be found. */
	189	if (intsetSearch(is,value,&pos)) {
	190	if (success) *success = 0;
	191	return is;
	192	}
	193
	194	is = intsetResize(is,intrev32ifbe(is->length)+1);
	195	if (pos < intrev32ifbe(is->length)) intsetMoveTail(is,pos,pos+1);
	196	}
	197
	198	_intsetSet(is,pos,value);
	199	is->length = intrev32ifbe(intrev32ifbe(is->length)+1);
	200	return is;
	201	}
	202
	203	/* Delete integer from intset */
	204	intset intsetRemove(intset is, int64_t value, int *success) {
	205	uint8_t valenc = _intsetValueEncoding(value);
	206	uint32_t pos;
	207	if (success) *success = 0;
	208
	209	if (valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,&pos)) {
	210	uint32_t len = intrev32ifbe(is->length);
	211
	212	/* We know we can delete */
	213	if (success) *success = 1;
	214
	215	/* Overwrite value with tail and update length */
	216	if (pos < (len-1)) intsetMoveTail(is,pos+1,pos);
	217	is = intsetResize(is,len-1);
	218	is->length = intrev32ifbe(len-1);
	219	}
	220	return is;
	221	}
	222
	223	/* Determine whether a value belongs to this set */
	224	uint8_t intsetFind(intset *is, int64_t value) {
	225	uint8_t valenc = _intsetValueEncoding(value);
	226	return valenc <= intrev32ifbe(is->encoding) && intsetSearch(is,value,NULL);
	227	}
	228
	229	/* Return random member */
	230	int64_t intsetRandom(intset *is) {
	231	return _intsetGet(is,rand()%intrev32ifbe(is->length));
	232	}
	233
	234	/* Sets the value to the value at the given position. When this position is
	235	* out of range the function returns 0, when in range it returns 1. */
	236	uint8_t intsetGet(intset is, uint32_t pos, int64_t value) {
	237	if (pos < intrev32ifbe(is->length)) {
	238	*value = _intsetGet(is,pos);
	239	return 1;
	240	}
	241	return 0;
	242	}
	243
	244	/* Return intset length */
	245	uint32_t intsetLen(intset *is) {
	246	return intrev32ifbe(is->length);
	247	}
	248
	249	/* Return intset blob size in bytes. */
	250	size_t intsetBlobLen(intset *is) {
	251	return sizeof(intset)+intrev32ifbe(is->length)*intrev32ifbe(is->encoding);
	252	}
	253
	254	#ifdef INTSET_TEST_MAIN
	255	#include <sys/time.h>
	256
	257	void intsetRepr(intset *is) {
	258	int i;
	259	for (i = 0; i < intrev32ifbe(is->length); i++) {
	260	printf("%lld\n", (uint64_t)_intsetGet(is,i));
	261	}
	262	printf("\n");
	263	}
	264
	265	void error(char *err) {
	266	printf("%s\n", err);
	267	exit(1);
	268	}
	269
	270	void ok(void) {
	271	printf("OK\n");
	272	}
	273
	274	long long usec(void) {
	275	struct timeval tv;
	276	gettimeofday(&tv,NULL);
	277	return (((long long)tv.tv_sec)*1000000)+tv.tv_usec;
	278	}
	279
	280	#define assert(_e) ((_e)?(void)0:(_assert(#_e,__FILE__,__LINE__),exit(1)))
	281	void _assert(char estr, char file, int line) {
	282	printf("\n\n=== ASSERTION FAILED ===\n");
	283	printf("==> %s:%d '%s' is not true\n",file,line,estr);
	284	}
	285
	286	intset *createSet(int bits, int size) {
	287	uint64_t mask = (1<<bits)-1;
	288	uint64_t i, value;
	289	intset *is = intsetNew();
	290
	291	for (i = 0; i < size; i++) {
	292	if (bits > 32) {
	293	value = (rand()*rand()) & mask;
	294	} else {
	295	value = rand() & mask;
	296	}
	297	is = intsetAdd(is,value,NULL);
	298	}
	299	return is;
	300	}
	301
	302	void checkConsistency(intset *is) {
	303	int i;
	304
	305	for (i = 0; i < (intrev32ifbe(is->length)-1); i++) {
	306	uint32_t encoding = intrev32ifbe(is->encoding);
	307
	308	if (encoding == INTSET_ENC_INT16) {
	309	int16_t i16 = (int16_t)is->contents;
	310	assert(i16[i] < i16[i+1]);
	311	} else if (encoding == INTSET_ENC_INT32) {
	312	int32_t i32 = (int32_t)is->contents;
	313	assert(i32[i] < i32[i+1]);
	314	} else {
	315	int64_t i64 = (int64_t)is->contents;
	316	assert(i64[i] < i64[i+1]);
	317	}
	318	}
	319	}
	320
	321	int main(int argc, char **argv) {
	322	uint8_t success;
	323	int i;
	324	intset *is;
	325	sranddev();
	326
	327	printf("Value encodings: "); {
	328	assert(_intsetValueEncoding(-32768) == INTSET_ENC_INT16);
	329	assert(_intsetValueEncoding(+32767) == INTSET_ENC_INT16);
	330	assert(_intsetValueEncoding(-32769) == INTSET_ENC_INT32);
	331	assert(_intsetValueEncoding(+32768) == INTSET_ENC_INT32);
	332	assert(_intsetValueEncoding(-2147483648) == INTSET_ENC_INT32);
	333	assert(_intsetValueEncoding(+2147483647) == INTSET_ENC_INT32);
	334	assert(_intsetValueEncoding(-2147483649) == INTSET_ENC_INT64);
	335	assert(_intsetValueEncoding(+2147483648) == INTSET_ENC_INT64);
	336	assert(_intsetValueEncoding(-9223372036854775808ull) == INTSET_ENC_INT64);
	337	assert(_intsetValueEncoding(+9223372036854775807ull) == INTSET_ENC_INT64);
	338	ok();
	339	}
	340
	341	printf("Basic adding: "); {
	342	is = intsetNew();
	343	is = intsetAdd(is,5,&success); assert(success);
	344	is = intsetAdd(is,6,&success); assert(success);
	345	is = intsetAdd(is,4,&success); assert(success);
	346	is = intsetAdd(is,4,&success); assert(!success);
	347	ok();
	348	}
	349
	350	printf("Large number of random adds: "); {
	351	int inserts = 0;
	352	is = intsetNew();
	353	for (i = 0; i < 1024; i++) {
	354	is = intsetAdd(is,rand()%0x800,&success);
	355	if (success) inserts++;
	356	}
	357	assert(intrev32ifbe(is->length) == inserts);
	358	checkConsistency(is);
	359	ok();
	360	}
	361
	362	printf("Upgrade from int16 to int32: "); {
	363	is = intsetNew();
	364	is = intsetAdd(is,32,NULL);
	365	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
	366	is = intsetAdd(is,65535,NULL);
	367	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
	368	assert(intsetFind(is,32));
	369	assert(intsetFind(is,65535));
	370	checkConsistency(is);
	371
	372	is = intsetNew();
	373	is = intsetAdd(is,32,NULL);
	374	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
	375	is = intsetAdd(is,-65535,NULL);
	376	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
	377	assert(intsetFind(is,32));
	378	assert(intsetFind(is,-65535));
	379	checkConsistency(is);
	380	ok();
	381	}
	382
	383	printf("Upgrade from int16 to int64: "); {
	384	is = intsetNew();
	385	is = intsetAdd(is,32,NULL);
	386	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
	387	is = intsetAdd(is,4294967295,NULL);
	388	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
	389	assert(intsetFind(is,32));
	390	assert(intsetFind(is,4294967295));
	391	checkConsistency(is);
	392
	393	is = intsetNew();
	394	is = intsetAdd(is,32,NULL);
	395	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT16);
	396	is = intsetAdd(is,-4294967295,NULL);
	397	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
	398	assert(intsetFind(is,32));
	399	assert(intsetFind(is,-4294967295));
	400	checkConsistency(is);
	401	ok();
	402	}
	403
	404	printf("Upgrade from int32 to int64: "); {
	405	is = intsetNew();
	406	is = intsetAdd(is,65535,NULL);
	407	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
	408	is = intsetAdd(is,4294967295,NULL);
	409	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
	410	assert(intsetFind(is,65535));
	411	assert(intsetFind(is,4294967295));
	412	checkConsistency(is);
	413
	414	is = intsetNew();
	415	is = intsetAdd(is,65535,NULL);
	416	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT32);
	417	is = intsetAdd(is,-4294967295,NULL);
	418	assert(intrev32ifbe(is->encoding) == INTSET_ENC_INT64);
	419	assert(intsetFind(is,65535));
	420	assert(intsetFind(is,-4294967295));
	421	checkConsistency(is);
	422	ok();
	423	}
	424
	425	printf("Stress lookups: "); {
	426	long num = 100000, size = 10000;
	427	int i, bits = 20;
	428	long long start;
	429	is = createSet(bits,size);
	430	checkConsistency(is);
	431
	432	start = usec();
	433	for (i = 0; i < num; i++) intsetSearch(is,rand() % ((1<<bits)-1),NULL);
	434	printf("%ld lookups, %ld element set, %lldusec\n",num,size,usec()-start);
	435	}
	436
	437	printf("Stress add+delete: "); {
	438	int i, v1, v2;
	439	is = intsetNew();
	440	for (i = 0; i < 0xffff; i++) {
	441	v1 = rand() % 0xfff;
	442	is = intsetAdd(is,v1,NULL);
	443	assert(intsetFind(is,v1));
	444
	445	v2 = rand() % 0xfff;
	446	is = intsetRemove(is,v2,NULL);
	447	assert(!intsetFind(is,v2));
	448	}
	449	checkConsistency(is);
	450	ok();
	451	}
	452	}
	453	#endif