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* Fix endianness bug.

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This commit is contained in:
Eelco Dolstra 2005-03-23 19:18:22 +00:00
parent 590e5a0d65
commit cff6bc06df
1 changed files with 18 additions and 18 deletions
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36
src/libutil/hash.cc
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@ -90,18 +90,18 @@ Hash parseHash(HashType ht, const string & s)
}
static unsigned short divMod(uint16_t * words, unsigned short y)
static unsigned char divMod(unsigned char * bytes, unsigned char y)
{
unsigned int borrow = 0;
int pos = (Hash::maxHashSize / 2) - 1;
while (pos >= 0 && !words[pos]) --pos;
int pos = Hash::maxHashSize - 1;
while (pos >= 0 && !bytes[pos]) --pos;
for ( ; pos >= 0; --pos) {
unsigned int s = words[pos] + (borrow << 16);
unsigned int s = bytes[pos] + (borrow << 8);
unsigned int d = s / y;
borrow = s % y;
words[pos] = d;
bytes[pos] = d;
}
return borrow;
@ -121,7 +121,7 @@ string printHash32(const Hash & hash)
int pos = len - 1;
while (pos >= 0) {
unsigned short digit = divMod((uint16_t *) hash2.hash, 32);
unsigned char digit = divMod(hash2.hash, 32);
s[pos--] = chars[digit];
}
@ -132,28 +132,28 @@ string printHash32(const Hash & hash)
}
static bool mul(uint16_t * words, unsigned short y, int maxSize)
static bool mul(unsigned char * bytes, unsigned char y, int maxSize)
{
unsigned short carry = 0;
unsigned char carry = 0;
for (int pos = 0; pos < maxSize; ++pos) {
unsigned int m = words[pos] * y + carry;
words[pos] = m & 0xffff;
carry = m >> 16;
unsigned int m = bytes[pos] * y + carry;
bytes[pos] = m & 0xff;
carry = m >> 8;
}
return carry;
}
static bool add(uint16_t * words, unsigned short y, int maxSize)
static bool add(unsigned char * bytes, unsigned char y, int maxSize)
{
unsigned short carry = y;
unsigned char carry = y;
for (int pos = 0; pos < maxSize; ++pos) {
unsigned int m = words[pos] + carry;
words[pos] = m & 0xffff;
carry = m >> 16;
unsigned int m = bytes[pos] + carry;
bytes[pos] = m & 0xff;
carry = m >> 8;
if (carry == 0) break;
}
@ -172,8 +172,8 @@ Hash parseHash32(HashType ht, const string & s)
if (chars[digit] == c) break;
if (digit >= 32)
throw Error(format("invalid base-32 hash `%1%'") % s);
if (mul((uint16_t *) hash.hash, 32, hash.hashSize / 2) ||
add((uint16_t *) hash.hash, digit, hash.hashSize / 2))
if (mul(hash.hash, 32, hash.hashSize) ||
add(hash.hash, digit, hash.hashSize))
throw Error(format("base-32 hash `%1%' is too large") % s);
}