mirror of
https://github.com/radareorg/radare2.git
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93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* Original code from:
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* dmc - dynamic mail client -- author: pancake
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* See LICENSE file for copyright and license details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !defined(MINGW32)
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#include <unistd.h>
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#endif
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#include <r_util.h>
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#define SZ 1024
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static const char cb64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static const char cd64[] = "|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW$$$$$$XYZ[\\]^_`abcdefghijklmnopq";
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static void b64_encode(const ut8 in[3], char out[4], int len) {
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if (len < 1) return;
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out[0] = cb64[in[0] >> 2];
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out[1] = cb64[((in[0] & 0x03) << 4) | ((len > 1)? ((in[1] & 0xf0) >> 4): 0)];
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out[2] = (len > 1? cb64[((in[1] & 0x0f) << 2) | (len > 2? ((in[2] & 0xc0) >> 6): 0)]: '=');
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out[3] = (len > 2? cb64[in[2] & 0x3f]: '=');
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}
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static int b64_decode(const char in[4], ut8 out[3]) {
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ut8 len = 3, i, v[4] = { 0 };
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for (i = 0; i < 4; i++) {
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if (in[i] < 43 || in[i] > 122)
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return -1;
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v[i] = cd64[in[i] - 43];
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if (v[i] == '$') {
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len = i - 1;
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break;
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} else v[i] -= 62;
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}
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out[0] = v[0] << 2 | v[1] >> 4;
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out[1] = v[1] << 4 | v[2] >> 2;
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out[2] = ((v[2] << 6) & 0xc0) | v[3];
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return len;
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}
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R_API int r_base64_decode(ut8 *bout, const char *bin, int len) {
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int in, out, ret;
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if (len < 0)
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len = strlen (bin);
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for (in = out = 0; in < len - 1; in += 4) {
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ret = b64_decode (bin + in, bout + out);
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if (ret < 1)
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break;
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out += ret;
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}
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bout[out] = 0;
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return (in != out)? out: 0;
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}
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R_API ut8 *r_base64_decode_dyn(const char *in, int len) {
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ut8 *bout;
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if (!in) return NULL;
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if (len < 0) len = strlen (in) + 1;
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bout = malloc (len);
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r_base64_decode (bout, in, len);
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return bout;
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}
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R_API int r_base64_encode(char *bout, const ut8 *bin, int len) {
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int in, out;
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if (len < 0)
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len = strlen ((const char *)bin);
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for (in = out = 0; in < len; in += 3, out += 4)
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b64_encode (bin + in, (char *)bout + out,
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(len - in) > 3? 3: len - in);
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bout[out] = 0;
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return out;
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}
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R_API char *r_base64_encode_dyn(const char *str, int len) {
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char *bout;
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int in, out;
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if (!str) return NULL;
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if (len < 0) len = strlen (str);
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if ((len * 4) + 2 < len) return NULL;
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bout = (char *)malloc ((len * 4) + 2);
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if (!bout) return NULL;
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for (in = out = 0; in < len; in += 3, out += 4)
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b64_encode ((const ut8 *)str + in, (char *)bout + out,
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(len - in) > 3? 3: len - in);
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bout[out] = 0;
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return bout;
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}
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