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Faster Base64 decoder.

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This commit is contained in:
JoelKatz
2011-07-25 15:13:55 -07:00
committed by Pieter Wuille
parent 9a1ce86969
commit 4e67a6216b
3 changed files with 60 additions and 18 deletions
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59
src/util.cpp
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@@ -470,6 +470,65 @@ void ParseParameters(int argc, char* argv[])
}
}
static const int decode64_table[256]=
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1,
-1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
};
std::string DecodeBase64(const std::string &s)
{
char buf[1024];
if(s.length()>512) return "";
char *optr=buf;
int dec, mode=0, left=0;
size_t index=0;
for (int i=0; i<s.length(); i++)
{
dec=decode64_table[s[i]];
if(dec==-1) break;
switch(mode)
{
case 0: // we have no bits and get 6
left = dec;
mode = 1;
break;
case 1: // we have 6 bits and keep 4
*optr++ = (left<<2) | (dec>>4);
left = dec & 15;
mode = 2;
break;
case 2: // we have 4 bits and get 6, we keep 2
*optr++ = (left<<4) | (dec>>2);
left = dec & 3;
mode = 3;
break;
case 3: // we have 2 bits and get 6
*optr++ = (left<<6) | dec;
mode=0;
break;
}
}
*optr=0;
return buf;
}
bool WildcardMatch(const char* psz, const char* mask)