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add base64url support

master
Felix von Leitner 5 years ago
parent
commit
4aee13bc9e
  1. 9
      test/textcode.c
  2. 1
      textcode/base64url.c
  3. 24
      textcode/fmt_base64url.c
  4. 2
      textcode/scan_base64.c
  5. 31
      textcode/scan_base64url.c

9
test/textcode.c

@ -1,7 +1,10 @@
#include "array.h"
#include "textcode.h"
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <write12.h>
array a;
@ -26,5 +29,11 @@ int main() {
buf[n]=0;
puts(buf);
assert(fmt_base64(buf,"fnörd",6)==8 && !memcmp(buf,"Zm7DtnJk",8));
assert(scan_base64("Zm7DtnJk",buf,&n)==8 && n==6 && !memcmp(buf,"fnörd",6));
assert(fmt_base64(buf,"x",1)==4 && !memcmp(buf,"eA==",4));
assert(scan_base64("eA====",buf,&n)==4 && n==1 && buf[0]=='x');
assert(fmt_base64url(buf,"\xef\xbf\xbdx",4)==6 && !memcmp(buf,"77-9eA",6));
assert(scan_base64url("77-9eA",buf,&n)==6 && n==4 && !memcmp(buf,"\xef\xbf\xbdx",4));
return 0;
}

1
textcode/base64url.c

@ -0,0 +1 @@
const char base64url[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=";

24
textcode/fmt_base64url.c

@ -0,0 +1,24 @@
#include "fmt.h"
#include "textcode.h"
#include "haveinline.h"
size_t fmt_base64url(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]=base64url[((temp>>(bits-6))&63)];
++written; bits-=6;
}
}
if (bits) {
temp<<=(6-bits);
dest[written]=base64url[temp&63];
++written;
}
/* no padding for base64url */
return written;
}

2
textcode/scan_base64.c

@ -19,7 +19,7 @@ size_t scan_base64(const char *src,char *dest,size_t *destlen) {
for (;;) {
int a=dec(*s);
if (a<0) {
while (*s=='=') ++s;
while (*s=='=' && ((s-(const unsigned char*)src)&3)) ++s;
break;
}
tmp=(tmp<<6)|a; bits+=6;

31
textcode/scan_base64url.c

@ -0,0 +1,31 @@
#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;
}
}
size_t scan_base64url(const char *src,char *dest,size_t *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) break;
tmp=(tmp<<6)|a; bits+=6;
++s;
if (bits>=8) {
*dest=(tmp>>(bits-=8));
++dest;
}
}
*destlen=dest-orig;
return (const char*)s-src;
}
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