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/* Original code from:
* dmc - dynamic mail client -- author: pancake
* See LICENSE file for copyright and license details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <r_util.h>
#define SZ 1024
static const char cb64[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char cd64[]="|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq";
static void b64_encode(const ut8 in[3], ut8 out[4], int len) {
out[0] = cb64[ in[0] >> 2 ];
out[1] = cb64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
out[2] = (len > 1 ? cb64[ ((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6) ] : '=');
out[3] = (len > 2 ? cb64[ in[2] & 0x3f ] : '=');
}
static int b64_decode(const ut8 in[4], ut8 out[3]) {
ut8 len = 3, i, v[4] = {0};
for (i=0; i<4; i++) {
if (in[i]<43||in[i]>122)
return -1;
v[i] = cd64[in[i]-43];
if (v[i]=='$') {
len = i-1;
break;
} else v[i]-=62;
}
out[0] = v[0] << 2 | v[1] >> 4;
out[1] = v[1] << 4 | v[2] >> 2;
out[2] = ((v[2] << 6) & 0xc0) | v[3];
return len;
}
R_API int r_base64_decode(ut8 *bout, const ut8 *bin, int len) {
int in, out, ret;
for (in=out=0; in<len-1;in+=4) {
ret = b64_decode (bin+in, bout+out);
if (ret <1)
break;
out += 3;
}
bout[out-1] = 0;
return (in != out);
}
R_API void r_base64_encode(ut8 *bout, const ut8 *bin, int len) {
int in, out;
for (in=out=0; in<len; in+=3,out+=4)
b64_encode (bin+in, bout+out, len-in>3?3:len-in);
}
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