diff options
Diffstat (limited to 'cpukit/dev/iobase64.c')
-rw-r--r-- | cpukit/dev/iobase64.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/cpukit/dev/iobase64.c b/cpukit/dev/iobase64.c new file mode 100644 index 0000000000..0ac70d3ddb --- /dev/null +++ b/cpukit/dev/iobase64.c @@ -0,0 +1,111 @@ +/* SPDX-License-Identifier: ISC */ + +/** + * @file + * + * @ingroup RTEMSDeviceIO + * + * @brief This source file contains the implementation of + * _IO_Base64() and _IO_Base64url(). + */ + +/* + * Copyright (C) 2020, 2021 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/dev/io.h> + +static void +_IO_Put(int c, void *arg, IO_Put_char put_char) +{ + (*put_char)(c, arg); +} + +static int +_IO_Base64_with_encoding(IO_Put_char put_char, void *arg, const void *src, + size_t srclen, const char *wordbreak, int wordlen, const char *encoding) +{ + unsigned int loops = 0; + const unsigned char *in = src; + int out = 0; + + if (wordlen < 4) { + wordlen = 4; + } + + while (srclen > 2) { + _IO_Put(encoding[(in[0]>>2)&0x3f], arg, put_char); + _IO_Put(encoding[((in[0]<<4)&0x30)| + ((in[1]>>4)&0x0f)], arg, put_char); + _IO_Put(encoding[((in[1]<<2)&0x3c)| + ((in[2]>>6)&0x03)], arg, put_char); + _IO_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') { + _IO_Put(*w, arg, put_char); + ++w; + ++out; + } + } + } + if (srclen == 2) { + _IO_Put(encoding[(in[0]>>2)&0x3f], arg, put_char); + _IO_Put(encoding[((in[0]<<4)&0x30)| + ((in[1]>>4)&0x0f)], arg, put_char); + _IO_Put(encoding[((in[1]<<2)&0x3c)], arg, put_char); + _IO_Put('=', arg, put_char); + out += 4; + } else if (srclen == 1) { + _IO_Put(encoding[(in[0]>>2)&0x3f], arg, put_char); + _IO_Put(encoding[((in[0]<<4)&0x30)], arg, put_char); + _IO_Put('=', arg, put_char); + _IO_Put('=', arg, put_char); + out += 4; + } + return out; +} + +static const char base64[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; + +int +_IO_Base64(IO_Put_char put_char, void *arg, const void *src, size_t srclen, + const char *wordbreak, int wordlen) +{ + return _IO_Base64_with_encoding(put_char, arg, src, srclen, wordbreak, + wordlen, base64); +} + +static const char base64url[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_="; + +int +_IO_Base64url(IO_Put_char put_char, void *arg, const void *src, size_t srclen, + const char *wordbreak, int wordlen) +{ + return _IO_Base64_with_encoding(put_char, arg, src, srclen, wordbreak, + wordlen, base64url); +} |