99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/* -*- Mode: C ; c-basic-offset: 2 -*- */
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/*
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* LADI Session Handler (ladish)
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*
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* Copyright (C) 2009 Nedko Arnaudov <nedko@arnaudov.name>
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*
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**************************************************************************
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* This file contains implementation of the escape helper functions
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**************************************************************************
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*
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* LADI Session Handler is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* LADI Session Handler is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LADI Session Handler. If not, see <http://www.gnu.org/licenses/>
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* or write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "escape.h"
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static char hex_digits[] = "0123456789ABCDEF";
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#define HEX_TO_INT(hexchar) ((hexchar) <= '9' ? hexchar - '0' : 10 + (hexchar - 'A'))
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void escape(const char ** src_ptr, char ** dst_ptr)
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{
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const char * src;
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char * dst;
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src = *src_ptr;
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dst = *dst_ptr;
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while (*src != 0)
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{
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switch (*src)
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{
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case '/': /* used as separator for address components */
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case '<': /* invalid attribute value char (XML spec) */
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case '&': /* invalid attribute value char (XML spec) */
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case '"': /* we store attribute values in double quotes - invalid attribute value char (XML spec) */
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case '\'':
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case '>':
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case '%':
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dst[0] = '%';
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dst[1] = hex_digits[*src >> 4];
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dst[2] = hex_digits[*src & 0x0F];
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dst += 3;
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src++;
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break;
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default:
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*dst++ = *src++;
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}
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}
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*src_ptr = src;
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*dst_ptr = dst;
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}
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size_t unescape(const char * src, size_t src_len, char * dst)
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{
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size_t dst_len;
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dst_len = 0;
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while (src_len)
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{
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if (src_len >= 3 &&
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src[0] == '%' &&
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((src[1] >= '0' && src[1] <= '9') ||
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(src[1] >= 'A' && src[1] <= 'F')) &&
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((src[2] >= '0' && src[2] <= '9') ||
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(src[2] >= 'A' && src[2] <= 'F')))
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{
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*dst = (HEX_TO_INT(src[1]) << 4) | HEX_TO_INT(src[2]);
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//lash_info("unescaping %c%c%c to '%c'", src[0], src[1], src[2], *dst);
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src_len -= 3;
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src += 3;
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}
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else
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{
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*dst = *src;
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src_len--;
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src++;
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}
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dst++;
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dst_len++;
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}
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return dst_len;
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}
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