Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
#include "textcode.h"
#include "haveinline.h"
size_t fmt_base64(char* dest,const char* src,size_t len) {
register const unsigned char* s=(const unsigned char*) src;
unsigned short bits=0,temp=0;
size_t written=0,i;
if (!dest) return (len>((size_t)-1)/2)?(size_t)-1:((len+2)/3)*4;
for (i=0; i<len; ++i) {
temp<<=8; temp+=s[i]; bits+=8;
while (bits>6) {
dest[written]=base64[((temp>>(bits-6))&63)];
++written; bits-=6;
}
}
if (bits) {
temp<<=(6-bits);
dest[written]=base64[temp&63];
++written;
}
while (written&3) { dest[written]='='; ++written; }
return written;
}