mirror of
https://github.com/DarkFlippers/unleashed-firmware.git
synced 2024-12-22 21:01:40 +03:00
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*
|
|
* Base64 encoding/decoding (RFC1341)
|
|
* Copyright (c) 2005, Jouni Malinen <j@w1.fi>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of BSD
|
|
* license.
|
|
*
|
|
*/
|
|
|
|
#include "base64.h"
|
|
#include <string.h>
|
|
|
|
static const uint8_t dtable[] = {0x3e, 0x80, 0x80, 0x80, 0x3f, 0x34, 0x35, 0x36, 0x37, 0x38,
|
|
0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x80, 0x80, 0x80, 0x0, 0x80,
|
|
0x80, 0x80, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
|
|
0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11,
|
|
0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x80, 0x80,
|
|
0x80, 0x80, 0x80, 0x80, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
|
|
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
|
|
0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33};
|
|
// "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
static uint8_t get_dtable_value(uint8_t index) {
|
|
return (index < 43 || index > 122) ? 0x80 : dtable[index - 43];
|
|
}
|
|
|
|
uint8_t* base64_decode(const uint8_t* src, size_t len, size_t* out_len, size_t* out_size) {
|
|
uint8_t *out;
|
|
uint8_t *pos;
|
|
uint8_t in[4];
|
|
uint8_t block[4];
|
|
uint8_t tmp;
|
|
size_t i;
|
|
size_t count;
|
|
size_t olen;
|
|
|
|
count = 0;
|
|
for(i = 0; i < len; i++) {
|
|
if(get_dtable_value(src[i]) != 0x80) count++;
|
|
}
|
|
|
|
if(count == 0 || count % 4) return NULL;
|
|
olen = count / 4 * 3;
|
|
pos = out = malloc(olen);
|
|
*out_size = olen;
|
|
if(out == NULL) return NULL;
|
|
count = 0;
|
|
for(i = 0; i < len; i++) {
|
|
tmp = get_dtable_value(src[i]);
|
|
if(tmp == 0x80) continue;
|
|
in[count] = src[i];
|
|
block[count] = tmp;
|
|
count++;
|
|
if(count == 4) {
|
|
*pos++ = (block[0] << 2) | (block[1] >> 4);
|
|
*pos++ = (block[1] << 4) | (block[2] >> 2);
|
|
*pos++ = (block[2] << 6) | block[3];
|
|
count = 0;
|
|
}
|
|
}
|
|
if(pos > out) {
|
|
if(in[2] == '=')
|
|
pos -= 2;
|
|
else if(in[3] == '=')
|
|
pos--;
|
|
}
|
|
*out_len = pos - out;
|
|
return out;
|
|
} |