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Avoiding referencing elements of an empty vector

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ENikS 2014-09-23 11:54:12 -04:00
parent 35ee2dac67
commit 459a2d25e0
1 changed files with 36 additions and 33 deletions
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69
src/hash.cpp
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@ -9,46 +9,49 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
{
// The following is MurmurHash3 (x86_32), see http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
uint32_t h1 = nHashSeed;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
if (vDataToHash.size() > 0)
{
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
const int nblocks = vDataToHash.size() / 4;
const int nblocks = vDataToHash.size() / 4;
//----------
// body
const uint32_t* blocks = (const uint32_t*)(&vDataToHash[0] + nblocks * 4);
//----------
// body
const uint32_t* blocks = (const uint32_t*)(&vDataToHash[0] + nblocks * 4);
for (int i = -nblocks; i; i++) {
uint32_t k1 = blocks[i];
for (int i = -nblocks; i; i++) {
uint32_t k1 = blocks[i];
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
h1 ^= k1;
h1 = ROTL32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
//----------
// tail
const uint8_t* tail = (const uint8_t*)(&vDataToHash[0] + nblocks * 4);
uint32_t k1 = 0;
switch (vDataToHash.size() & 3) {
case 3:
k1 ^= tail[2] << 16;
case 2:
k1 ^= tail[1] << 8;
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
}
//----------
// tail
const uint8_t* tail = (const uint8_t*)(&vDataToHash[0] + nblocks * 4);
uint32_t k1 = 0;
switch (vDataToHash.size() & 3) {
case 3:
k1 ^= tail[2] << 16;
case 2:
k1 ^= tail[1] << 8;
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
//----------
// finalization
h1 ^= vDataToHash.size();