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/* SPDX-License-Identifier: ISC */
/**
* @file
*
* @ingroup RTEMSImplBase64
*
* @brief This source file contains the implementation of
* _Base64_Encode() and _Base64url_Encode().
*/
/*
* Copyright (C) 2020, 2024 embedded brains GmbH & Co. KG
* Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1998-2001, 2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include <rtems/base64.h>
static void
_Base64_Put(int c, void *arg, IO_Put_char put_char)
{
(*put_char)(c, arg);
}
static int
_Base64_Do_encode(IO_Put_char put_char, void *arg, const void *src,
size_t srclen, const char *wordbreak, int wordlen, const uint8_t *encoding)
{
unsigned int loops = 0;
const unsigned char *in = src;
int out = 0;
if (wordlen < 4) {
wordlen = 4;
}
while (srclen > 2) {
_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
_Base64_Put(encoding[((in[0]<<4)&0x30)|
((in[1]>>4)&0x0f)], arg, put_char);
_Base64_Put(encoding[((in[1]<<2)&0x3c)|
((in[2]>>6)&0x03)], arg, put_char);
_Base64_Put(encoding[in[2]&0x3f], arg, put_char);
in += 3;
srclen -= 3;
out += 4;
loops++;
if (srclen != 0 &&
(int)((loops + 1) * 4) >= wordlen)
{
const char *w = wordbreak;
loops = 0;
while (*w != '\0') {
_Base64_Put(*w, arg, put_char);
++w;
++out;
}
}
}
if (srclen == 2) {
_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
_Base64_Put(encoding[((in[0]<<4)&0x30)|
((in[1]>>4)&0x0f)], arg, put_char);
_Base64_Put(encoding[((in[1]<<2)&0x3c)], arg, put_char);
_Base64_Put('=', arg, put_char);
out += 4;
} else if (srclen == 1) {
_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
_Base64_Put(encoding[((in[0]<<4)&0x30)], arg, put_char);
_Base64_Put('=', arg, put_char);
_Base64_Put('=', arg, put_char);
out += 4;
}
return out;
}
const uint8_t _Base64_Encoding[64] = {
'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', '+', '/'
};
int
_Base64_Encode(IO_Put_char put_char, void *arg, const void *src, size_t srclen,
const char *wordbreak, int wordlen)
{
return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
wordlen, _Base64_Encoding);
}
const uint8_t _Base64url_Encoding[64] = {
'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', '-', '_'
};
int
_Base64url_Encode(IO_Put_char put_char, void *arg, const void *src,
size_t srclen, const char *wordbreak, int wordlen)
{
return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
wordlen, _Base64url_Encoding);
}
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