api/dencode_8c_source.html

00001 /*
00002  * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  */
00032
00033 /*
00034  * $Log$
00035  * Revision 1.7  2009/03/07 00:19:29  olereinhardt
00036  * Moved base64 decoder to gorp/base64/base64_decode.c
00037  *
00038  * Revision 1.6  2006/03/16 15:25:38  haraldkipp
00039  * Changed human readable strings from u_char to char to stop GCC 4 from
00040  * nagging about signedness.
00041  *
00042  * Revision 1.5  2004/03/16 16:48:46  haraldkipp
00043  * Added Jan Dubiec's H8/300 port.
00044  *
00045  * Revision 1.4  2004/01/16 10:27:55  drsung
00046  * Another code size improvement.
00047  *
00048  * Revision 1.3  2003/11/27 08:46:41  drsung
00049  * Code size improvement
00050  *
00051  * Revision 1.2  2003/11/27 08:30:54  drsung
00052  * Bug fix
00053  *
00054  */
00055
00056 #include "dencode.h"
00057
00058 int NutDecodeHex(char c)
00059 {
00060     if (c >= '0' && c <= '9')
00061         return c - '0';
00062     if (c >= 'a' && c <= 'f')
00063         return c - 'a' + 10;
00064     if (c >= 'A' && c <= 'F')
00065         return c - 'A' + 10;
00066     return -1;
00067 }
00068
00069 char *NutDecodePath(char *path)
00070 {
00071     int x1;
00072     int x2;
00073     char *src = path;
00074     char *dst = path;
00075     char last = *path;
00076
00077     if (last != '/')
00078         return 0;
00079     while (*++src) {
00080         if (*src == '%' &&
00081             (x1 = NutDecodeHex(*(src + 1))) >= 0 &&
00082             (x2 = NutDecodeHex(*(src + 2))) >= 0) {
00083             src += 2;
00084             if ((*src = x1 * 16 + x2) == 0)
00085                 break;
00086         }
00087         if (*src == '\\')
00088             *src = '/';
00089         if ((last != '.' && last != '/') || (*src != '.' && *src != '/'))
00090             *dst++ = last = *src;
00091
00092     }
00093     *dst = 0;
00094
00095     return path;
00096 }