add base64url support
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@ -1,7 +1,10 @@
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#include "array.h"
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#include "array.h"
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#include "textcode.h"
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#include "textcode.h"
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#include <string.h>
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#include <stdio.h>
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#include <assert.h>
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#include <assert.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <write12.h>
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array a;
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array a;
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@ -26,5 +29,11 @@ int main() {
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buf[n]=0;
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buf[n]=0;
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puts(buf);
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puts(buf);
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assert(fmt_base64(buf,"fnörd",6)==8 && !memcmp(buf,"Zm7DtnJk",8));
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assert(scan_base64("Zm7DtnJk",buf,&n)==8 && n==6 && !memcmp(buf,"fnörd",6));
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assert(fmt_base64(buf,"x",1)==4 && !memcmp(buf,"eA==",4));
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assert(scan_base64("eA====",buf,&n)==4 && n==1 && buf[0]=='x');
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assert(fmt_base64url(buf,"\xef\xbf\xbdx",4)==6 && !memcmp(buf,"77-9eA",6));
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assert(scan_base64url("77-9eA",buf,&n)==6 && n==4 && !memcmp(buf,"\xef\xbf\xbdx",4));
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return 0;
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return 0;
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}
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}
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1
textcode/base64url.c
Normal file
1
textcode/base64url.c
Normal file
@ -0,0 +1 @@
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const char base64url[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=";
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24
textcode/fmt_base64url.c
Normal file
24
textcode/fmt_base64url.c
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@ -0,0 +1,24 @@
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#include "fmt.h"
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#include "textcode.h"
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#include "haveinline.h"
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size_t fmt_base64url(char* dest,const char* src,size_t len) {
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register const unsigned char* s=(const unsigned char*) src;
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unsigned short bits=0,temp=0;
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size_t written=0,i;
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if (!dest) return (len>((size_t)-1)/2)?(size_t)-1:((len+2)/3)*4;
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for (i=0; i<len; ++i) {
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temp<<=8; temp+=s[i]; bits+=8;
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while (bits>6) {
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dest[written]=base64url[((temp>>(bits-6))&63)];
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++written; bits-=6;
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}
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}
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if (bits) {
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temp<<=(6-bits);
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dest[written]=base64url[temp&63];
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++written;
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}
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/* no padding for base64url */
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return written;
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}
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@ -19,7 +19,7 @@ size_t scan_base64(const char *src,char *dest,size_t *destlen) {
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for (;;) {
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for (;;) {
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int a=dec(*s);
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int a=dec(*s);
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if (a<0) {
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if (a<0) {
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while (*s=='=') ++s;
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while (*s=='=' && ((s-(const unsigned char*)src)&3)) ++s;
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break;
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break;
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}
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}
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tmp=(tmp<<6)|a; bits+=6;
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tmp=(tmp<<6)|a; bits+=6;
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31
textcode/scan_base64url.c
Normal file
31
textcode/scan_base64url.c
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#include "textcode.h"
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#include "haveinline.h"
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static inline int dec(unsigned char x) {
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if (x>='A' && x<='Z') return x-'A';
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if (x>='a' && x<='z') return x-'a'+26;
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if (x>='0' && x<='9') return x-'0'+26+26;
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switch (x) {
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case '-': return 62;
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case '_': return 63;
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default: return -1;
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}
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}
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size_t scan_base64url(const char *src,char *dest,size_t *destlen) {
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unsigned short tmp=0,bits=0;
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register const unsigned char* s=(const unsigned char*) src;
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const char* orig=dest;
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for (;;) {
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int a=dec(*s);
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if (a<0) break;
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tmp=(tmp<<6)|a; bits+=6;
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++s;
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if (bits>=8) {
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*dest=(tmp>>(bits-=8));
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++dest;
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}
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}
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*destlen=dest-orig;
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return (const char*)s-src;
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}
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