00001 /* 00002 * Copyright (C) 2009 by Thermotemp GmbH. All rights reserved. 00003 * 00004 * These routines where mainly taken from pro/dencode.c 00005 * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions 00009 * are met: 00010 * 00011 * 1. Redistributions of source code must retain the above copyright 00012 * notice, this list of conditions and the following disclaimer. 00013 * 2. Redistributions in binary form must reproduce the above copyright 00014 * notice, this list of conditions and the following disclaimer in the 00015 * documentation and/or other materials provided with the distribution. 00016 * 3. Neither the name of the copyright holders nor the names of 00017 * contributors may be used to endorse or promote products derived 00018 * from this software without specific prior written permission. 00019 * 00020 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS 00021 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00022 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00023 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE 00024 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00025 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00026 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 00027 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 00028 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00029 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00030 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00031 * SUCH DAMAGE. 00032 * 00033 * For additional information see http://www.ethernut.de/ 00034 */ 00035 00056 #include <sys/types.h> 00057 #include <stdint.h> 00058 00063 00064 /* Base-64 decoding. This represents binary data as printable ASCII 00065 ** characters. Three 8-bit binary bytes are turned into four 6-bit 00066 ** values, like so: 00067 ** 00068 ** [11111111] [22222222] [33333333] 00069 ** 00070 ** [111111] [112222] [222233] [333333] 00071 ** 00072 ** Then the 6-bit values are represented using the characters "A-Za-z0-9+/". 00073 */ 00074 00075 /* Since base-64 encodes strings do not have any character above 127, 00076 * we need just the first 128 bytes. Furthermore there is no char 00077 * below 32, so we can save 32 additional bytes of flash. 00078 */ 00079 static prog_char base64dtab[96] = { 00080 /* 00081 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00082 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00083 */ 00084 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 00085 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, 00086 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 00087 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, 00088 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 00089 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, 00090 /* 00091 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00092 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00093 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00094 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00095 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00096 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00097 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 00098 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 */ 00099 }; 00100 00113 /* 00114 * Do base-64 decoding on a string. 00115 */ 00116 char *NutDecodeBase64(char * str) 00117 { 00118 /* bug fix from Damian Slee. */ 00119 char code; 00120 char *sp; 00121 char *tp; 00122 char last = -1; 00123 char step = 0; 00124 00125 for (tp = sp = str; *sp; ++sp) { 00126 if (*sp < 32) 00127 continue; 00128 if ((code = PRG_RDB(&base64dtab[(int) *sp - 32])) == (char)-1) 00129 continue; 00130 switch (step++) { 00131 case 1: 00132 *tp++ = ((last << 2) | ((code & 0x30) >> 4)); 00133 break; 00134 case 2: 00135 *tp++ = (((last & 0xf) << 4) | ((code & 0x3c) >> 2)); 00136 break; 00137 case 3: 00138 *tp++ = (((last & 0x03) << 6) | code); 00139 step = 0; 00140 break; 00141 } 00142 last = code; 00143 } 00144 *tp = 0; 00145 return str; 00146 } 00147