57 lines
1.5 KiB
C
57 lines
1.5 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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#include <unistd.h>
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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], ut8 out[4], int len) {
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out[0] = cb64[ in[0] >> 2 ];
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out[1] = cb64[ ((in[0] & 0x03) << 4) | ((in[1] & 0xf0) >> 4) ];
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out[2] = (len > 1 ? cb64[ ((in[1] & 0x0f) << 2) | ((in[2] & 0xc0) >> 6) ] : '=');
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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 ut8 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 ut8 *bin, int len) {
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int in, out, ret;
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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 += 3;
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}
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bout[out-1] = 0;
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return (in != out);
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}
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R_API void r_base64_encode(ut8 *bout, const ut8 *bin, int len) {
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int in, out;
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for (in=out=0; in<len; in+=3,out+=4)
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b64_encode (bin+in, bout+out, len-in>3?3:len-in);
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}
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