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ordered-binary.cpp

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#include "lmdb-js.h"
#ifdef _WIN32
#define ntohl _byteswap_ulong
#define htonl _byteswap_ulong
#else
#include <arpa/inet.h>
#endif
// compare items by 32-bit comparison, a is user provided and assumed to be zero terminated/padded
// which allows us to do the full 32-bit comparisons safely
int compareFast(const MDB_val *a, const MDB_val *b) {
uint32_t* dataA = (uint32_t*) a->mv_data;
uint32_t* dataB = (uint32_t*) b->mv_data;
size_t remaining = b->mv_size;
uint32_t aVal, bVal;
while(remaining >= 4) {
aVal = ntohl(*dataA);
bVal = ntohl(*dataB);
if (aVal > bVal)
return 1;
if (aVal < bVal)
return -1;
/*diff = (int64_t) ntohl(*dataA) - (int64_t) ntohl(*dataB);
if (diff)
return diff;*/
dataA++;
dataB++;
remaining -= 4;
}
if (remaining) {
if (remaining == 1) {
aVal = *((uint8_t*) dataA);
bVal = *((uint8_t*) dataB);
} else {
aVal = ntohl(*dataA);
bVal = remaining == 2 ? (*((uint8_t*) dataB) << 24) + (*((uint8_t*) dataB + 1) << 16) :
ntohl(*dataB & 0x00ffffff);
}
if (aVal > bVal)
return 1;
if (aVal < bVal)
return -1;
}
return a->mv_size - b->mv_size;
}
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