/**
*!
* \file algo_base64.c
* \version v0.0.1
* \date 2020/04/27
* \author Bean(notrynohigh@outlook.com)
*******************************************************************************
* @attention
*
* Copyright (c) 2020 Bean
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*******************************************************************************
*/
/*Includes ----------------------------------------------*/
#include "inc/algo_base64.h"
#include <string.h>
#if (defined(_ALGO_BASE64_ENABLE) && (_ALGO_BASE64_ENABLE == 1))
/**
* \addtogroup ALGORITHM
* \{
*/
/**
* \addtogroup BASE64
* \{
*/
/**
* \defgroup BASE64_Private_TypesDefinitions
* \{
*/
/**
* \}
*/
/**
* \defgroup BASE64_Private_Defines
* \{
*/
/**
* \}
*/
/**
* \defgroup BASE64_Private_Macros
* \{
*/
/**
* \}
*/
/**
* \defgroup BASE64_Private_Variables
* \{
*/
#define BASE64_PAD '='
#define BASE64DE_FIRST '+'
#define BASE64DE_LAST 'z'
/* BASE 64 encode table */
static const char base64en[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
};
/* ASCII order for BASE 64 decode, 255 in unused character */
static const uint8_t base64de[] = {
/* nul, soh, stx, etx, eot, enq, ack, bel, */
255, 255, 255, 255, 255, 255, 255, 255,
/* bs, ht, nl, vt, np, cr, so, si, */
255, 255, 255, 255, 255, 255, 255, 255,
/* dle, dc1, dc2, dc3, dc4, nak, syn, etb, */
255, 255, 255, 255, 255, 255, 255, 255,
/* can, em, sub, esc, fs, gs, rs, us, */
255, 255, 255, 255, 255, 255, 255, 255,
/* sp, '!', '"', '#', '$', '%', '&', ''', */
255, 255, 255, 255, 255, 255, 255, 255,
/* '(', ')', '*', '+', ',', '-', '.', '/', */
255, 255, 255, 62, 255, 255, 255, 63,
/* '0', '1', '2', '3', '4', '5', '6', '7', */
52, 53, 54, 55, 56, 57, 58, 59,
/* '8', '9', ':', ';', '<', '=', '>', '?', */
60, 61, 255, 255, 255, 255, 255, 255,
/* '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', */
255, 0, 1, 2, 3, 4, 5, 6,
/* 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', */
7, 8, 9, 10, 11, 12, 13, 14,
/* 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', */
15, 16, 17, 18, 19, 20, 21, 22,
/* 'X', 'Y', 'Z', '[', '\', ']', '^', '_', */
23, 24, 25, 255, 255, 255, 255, 255,
/* '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', */
255, 26, 27, 28, 29, 30, 31, 32,
/* 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', */
33, 34, 35, 36, 37, 38, 39, 40,
/* 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', */
41, 42, 43, 44, 45, 46, 47, 48,
/* 'x', 'y', 'z', '{', '|', '}', '~', del, */
49, 50, 51, 255, 255, 255, 255, 255};
/**
* \}
*/
/**
* \defgroup BASE64_Private_FunctionPrototypes
* \{
*/
/**
* \}
*/
/**
* \defgroup BASE64_Private_Functions
* \{
*/
/**
* \}
*/
/**
* \addtogroup BASE64_Exported_Functions
* \{
*/
uint16_t base64_encode(const uint8_t *in, uint16_t inlen, char *out)
{
int s;
uint16_t i;
uint16_t j;
uint8_t c;
uint8_t l;
s = 0;
l = 0;
for (i = j = 0; i < inlen; i++)
{
c = in[i];
switch (s)
{
case 0:
s = 1;
out[j++] = base64en[(c >> 2) & 0x3F];
break;
case 1:
s = 2;
out[j++] = base64en[((l & 0x3) << 4) | ((c >> 4) & 0xF)];
break;
case 2:
s = 0;
out[j++] = base64en[((l & 0xF) << 2) | ((c >> 6) & 0x3)];
out[j++] = base64en[c & 0x3F];
break;
}
l = c;
}
switch (s)
{
case 1:
out[j++] = base64en[(l & 0x3) << 4];
out[j++] = BASE64_PAD;
out[j++] = BASE64_PAD;
break;
case 2:
out[j++] = base64en[(l & 0xF) << 2];
out[j++] = BASE64_PAD;
break;
}
out[j] = 0;
return j;
}
uint16_t base64_decode(const char *in, uint16_t inlen, uint8_t *out)
{
uint16_t i;
uint16_t j;
uint8_t c;
if (inlen & 0x3)
{
return 0;
}
for (i = j = 0; i < inlen; i++)
{
if (in[i] == BASE64_PAD)
{
break;
}
if (in[i] < BASE64DE_FIRST || in[i] > BASE64DE_LAST)
{
return 0;
}
c = base64de[(uint8_t)in[i]];
if (c == 255)
{
return 0;
}
switch (i & 0x3)
{
case 0:
out[j] = (c << 2) & 0xFF;
break;
case 1:
out[j++] |= (c >> 4) & 0x3;
out[j] = (c & 0xF) << 4;
break;
case 2:
out[j++] |= (c >> 2) & 0xF;
out[j] = (c & 0x3) << 6;
break;
case 3:
out[j++] |= c;
break;
}
}
return j;
}
/**
* \}
*/
/**
* \}
*/
/**
* \}
*/
#endif
/************************ Copyright (c) 2020 Bean *****END OF FILE****/