forked from Imagelibrary/rtems
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/* SPDX-License-Identifier: ISC */
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/**
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* @file
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*
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* @ingroup RTEMSImplBase64
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*
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* @brief This source file contains the implementation of
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* _Base64_Encode() and _Base64url_Encode().
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*/
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/*
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* Copyright (C) 2020, 2024 embedded brains GmbH & Co. KG
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* Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1998-2001, 2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <rtems/base64.h>
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static void
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_Base64_Put(int c, void *arg, IO_Put_char put_char)
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{
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(*put_char)(c, arg);
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}
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static int
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_Base64_Do_encode(IO_Put_char put_char, void *arg, const void *src,
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size_t srclen, const char *wordbreak, int wordlen, const uint8_t *encoding)
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{
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unsigned int loops = 0;
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const unsigned char *in = src;
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int out = 0;
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if (wordlen < 4) {
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wordlen = 4;
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}
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while (srclen > 2) {
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_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
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_Base64_Put(encoding[((in[0]<<4)&0x30)|
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((in[1]>>4)&0x0f)], arg, put_char);
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_Base64_Put(encoding[((in[1]<<2)&0x3c)|
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((in[2]>>6)&0x03)], arg, put_char);
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_Base64_Put(encoding[in[2]&0x3f], arg, put_char);
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in += 3;
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srclen -= 3;
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out += 4;
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loops++;
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if (srclen != 0 &&
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(int)((loops + 1) * 4) >= wordlen)
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{
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const char *w = wordbreak;
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loops = 0;
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while (*w != '\0') {
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_Base64_Put(*w, arg, put_char);
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++w;
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++out;
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}
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}
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}
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if (srclen == 2) {
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_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
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_Base64_Put(encoding[((in[0]<<4)&0x30)|
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((in[1]>>4)&0x0f)], arg, put_char);
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_Base64_Put(encoding[((in[1]<<2)&0x3c)], arg, put_char);
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_Base64_Put('=', arg, put_char);
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out += 4;
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} else if (srclen == 1) {
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_Base64_Put(encoding[(in[0]>>2)&0x3f], arg, put_char);
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_Base64_Put(encoding[((in[0]<<4)&0x30)], arg, put_char);
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_Base64_Put('=', arg, put_char);
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_Base64_Put('=', arg, put_char);
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out += 4;
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}
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return out;
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}
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const uint8_t _Base64_Encoding[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
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'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
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't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', '+', '/'
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};
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int
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_Base64_Encode(IO_Put_char put_char, void *arg, const void *src, size_t srclen,
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const char *wordbreak, int wordlen)
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{
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return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
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wordlen, _Base64_Encoding);
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}
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const uint8_t _Base64url_Encoding[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
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'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
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't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', '-', '_'
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};
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int
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_Base64url_Encode(IO_Put_char put_char, void *arg, const void *src,
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size_t srclen, const char *wordbreak, int wordlen)
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{
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return _Base64_Do_encode(put_char, arg, src, srclen, wordbreak,
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wordlen, _Base64url_Encoding);
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}
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