add base64 scanner
parent
4f3f4ea52f
commit
4d0eca89fc
@ -0,0 +1,34 @@
|
||||
#include "textcode.h"
|
||||
#include "haveinline.h"
|
||||
|
||||
static inline int dec(unsigned char x) {
|
||||
if (x>='A' && x<='Z') return x-'A';
|
||||
if (x>='a' && x<='z') return x-'a'+26;
|
||||
if (x>='0' && x<='9') return x-'0'+26+26;
|
||||
switch (x) {
|
||||
case '+': return 62;
|
||||
case '/': return 63;
|
||||
default: return -1;
|
||||
}
|
||||
}
|
||||
|
||||
unsigned int scan_base64(const char *src,char *dest,unsigned int *destlen) {
|
||||
unsigned short tmp=0,bits=0;
|
||||
register const unsigned char* s=(const unsigned char*) src;
|
||||
const char* orig=dest;
|
||||
for (;;) {
|
||||
int a=dec(*s);
|
||||
if (a<0) {
|
||||
while (*s=='=') ++s;
|
||||
break;
|
||||
}
|
||||
tmp=(tmp<<6)|a; bits+=6;
|
||||
++s;
|
||||
if (bits>=8) {
|
||||
*dest=(tmp>>(bits-=8));
|
||||
++dest;
|
||||
}
|
||||
}
|
||||
*destlen=dest-orig;
|
||||
return (const char*)s-src;
|
||||
}
|
Loading…
Reference in New Issue