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Diffstat (limited to '')
| -rw-r--r-- | cpukit/base64/base64-encode.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/cpukit/base64/base64-encode.c b/cpukit/base64/base64-encode.c new file mode 100644 index 0000000000..0110f3ff67 --- /dev/null +++ b/cpukit/base64/base64-encode.c @@ -0,0 +1,121 @@ +/* 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); +} |