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* Ugh, printHash() was very inefficient because it used

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ostringstreams.  Around 11% of execution time was spent here (now
  it's 0.5%).
This commit is contained in:
Eelco Dolstra 2006-03-09 17:07:25 +00:00
parent b90c00e63f
commit 18c321308d
1 changed files with 7 additions and 5 deletions
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12
src/libutil/hash.cc
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@ -66,15 +66,17 @@ bool Hash::operator < (const Hash & h) const
} }
const string base16Chars = "0123456789abcdef";
string printHash(const Hash & hash) string printHash(const Hash & hash)
{ {
ostringstream str; char buf[hash.hashSize * 2];
for (unsigned int i = 0; i < hash.hashSize; i++) { for (unsigned int i = 0; i < hash.hashSize; i++) {
str.fill('0'); buf[i * 2] = base16Chars[hash.hash[i] >> 4];
str.width(2); buf[i * 2 + 1] = base16Chars[hash.hash[i] & 0x0f];
str << hex << (int) hash.hash[i];
} }
return str.str(); return string(buf, hash.hashSize * 2);
} }