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optimize fmt_base64 (Dan Gundlach)

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This commit is contained in:
leitner 2005-04-12 06:48:39 +00:00
parent 8853a10fc3
commit 828aa295f1
2 changed files with 5 additions and 3 deletions
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1
CHANGES
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@ -1,6 +1,7 @@
0.23:
also recognize EPFNOSUPPORT as EAFNOSUPPORT (groan)
fix a few man pages
optimize fmt_base64 (Dan Gundlach)
0.22:
uh, the scope_id detection #defined the wrong constant. libowfat

7
textcode/fmt_base64.c
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@ -6,18 +6,19 @@ unsigned long fmt_base64(char* dest,const char* src,unsigned long len) {
register const unsigned char* s=(const unsigned char*) src;
unsigned short bits=0,temp=0;
unsigned long written=0,i;
if (!dest) return ((len+2)/3)*4;
for (i=0; i<len; ++i) {
temp<<=8; temp+=s[i]; bits+=8;
while (bits>6) {
if (dest) dest[written]=base64[((temp>>(bits-6))&63)];
dest[written]=base64[((temp>>(bits-6))&63)];
++written; bits-=6;
}
}
if (bits) {
temp<<=(6-bits);
if (dest) dest[written]=base64[temp&63];
dest[written]=base64[temp&63];
++written;
}
while (written&3) { if (dest) dest[written]='='; ++written; }
while (written&3) { dest[written]='='; ++written; }
return written;
}