radare2/libr/util/base64.c

115 lines
2.6 KiB
C

/* 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>
#if !defined(MINGW32)
#include <unistd.h>
#endif
#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], char out[4], int len) {
if (len < 1) return;
out[0] = cb64[in[0] >> 2];
out[1] = cb64[((in[0] & 0x03) << 4) | ((len > 1)? ((in[1] & 0xf0) >> 4): 0)];
out[2] = (len > 1? cb64[((in[1] & 0x0f) << 2) | (len > 2? ((in[2] & 0xc0) >> 6): 0)]: '=');
out[3] = (len > 2? cb64[in[2] & 0x3f]: '=');
}
static int b64_decode(const char in[4], ut8 out[3], int isz) {
int len = 3;
ut8 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? i - 1: -1;
break;
}
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 char *bin, int len) {
int in, out, ret;
if (len < 0) {
len = strlen (bin);
}
for (in = out = 0; in + 3 < len; in += 4) {
ret = b64_decode (bin + in, bout + out, len - in - 1);
if (ret < 1) {
return -1;
}
out += ret;
}
bout[out] = 0;
/* XXX this makes no sense, just return out? */
return (in != out)? out: -1;
}
R_API ut8 *r_base64_decode_dyn(const char *in, int len) {
ut8 *bout;
if (!in) {
return NULL;
}
if (len < 0) {
len = strlen (in) + 1;
}
bout = calloc (4, len + 1);
if (r_base64_decode (bout, in, len) == -1) {
free (bout);
return NULL;
}
return bout;
}
R_API int r_base64_encode(char *bout, const ut8 *bin, int len) {
int in, out;
if (len < 0)
len = strlen ((const char *)bin);
for (in = out = 0; in < len; in += 3, out += 4)
b64_encode (bin + in, (char *)bout + out,
(len - in) > 3? 3: len - in);
bout[out] = 0;
return out;
}
R_API char *r_base64_encode_dyn(const char *str, int len) {
char *bout;
int in, out;
if (!str) {
return NULL;
}
if (len < 0) {
len = strlen (str);
}
const int olen = (len * 4) + 2;
if (olen < len) {
return NULL;
}
bout = (char *)malloc (olen);
if (!bout) {
return NULL;
}
for (in = out = 0; in < len; in += 3, out += 4)
b64_encode ((const ut8 *)str + in, (char *)bout + out,
(len - in) > 3? 3: len - in);
bout[out] = 0;
return bout;
}