j3d1/tinc
1
0
Fork 0
Code Issues 1 Pull requests Releases Wiki Activity

Finish base64 decoding routine.

Browse source
This commit is contained in:
Guus Sliepen 2011-07-03 23:33:56 +02:00
parent 80b81c00b1
commit 1e2d9b0899
1 changed files with 12 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
src/utils.c
View file

@ -34,12 +34,16 @@ static int charhex2bin(char c) {
} }
static int charb64decode(char c) { static int charb64decode(char c) {
if(c > 'a') if(c >= 'a')
return c - 'a' + 26; return c - 'a' + 26;
else if(c > 'A') else if(c >= 'A')
return c - 'A'; return c - 'A';
else if(c >= '0')
return c - '0' + 52;
else if(c == '+')
return 62;
else else
return c - '0'; return 63;
} }
void hex2bin(char *src, char *dst, int length) { void hex2bin(char *src, char *dst, int length) {
@ -58,11 +62,11 @@ void bin2hex(char *src, char *dst, int length) {
int b64decode(const char *src, char *dst, int length) { int b64decode(const char *src, char *dst, int length) {
uint32_t triplet = 0; uint32_t triplet = 0;
unsigned char *udst; unsigned char *udst = dst;
for(int i = 0; i < length; i++) { for(int i = 0; i < length; i++) {
triplet |= charb64decode(src[i]) << (6 * (i % 4)); triplet |= charb64decode(src[i]) << (6 * (i & 3));
if((i % 4) == 3) { if((i & 3) == 3) {
udst[0] = triplet & 0xff; triplet >>= 8; udst[0] = triplet & 0xff; triplet >>= 8;
udst[1] = triplet & 0xff; triplet >>= 8; udst[1] = triplet & 0xff; triplet >>= 8;
udst[2] = triplet; udst[2] = triplet;
@ -70,11 +74,11 @@ int b64decode(const char *src, char *dst, int length) {
udst += 3; udst += 3;
} }
} }
if((length % 4) == 3) { if((length & 3) == 3) {
udst[0] = triplet & 0xff; triplet >>= 8; udst[0] = triplet & 0xff; triplet >>= 8;
udst[1] = triplet & 0xff; udst[1] = triplet & 0xff;
return length / 4 * 3 + 2; return length / 4 * 3 + 2;
} else if((length % 4) == 2) { } else if((length & 3) == 2) {
udst[0] = triplet & 0xff; udst[0] = triplet & 0xff;
return length / 4 * 3 + 1; return length / 4 * 3 + 1;
} else { } else {