89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* This file is part of Anemone3DS
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* Copyright (C) 2016-2020 Contributors in CONTRIBUTORS.md
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Additional Terms 7.b and 7.c of GPLv3 apply to this file:
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* * Requiring preservation of specified reasonable legal notices or
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* author attributions in that material or in the Appropriate Legal
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* Notices displayed by works containing it.
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* * Prohibiting misrepresentation of the origin of that material,
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* or requiring that modified versions of such material be marked in
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* reasonable ways as different from the original version.
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*/
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static char from_hex(char c)
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{
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return isdigit(c) ? c - '0' : tolower(c) - 'a' + 10;
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}
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static char to_hex(char code)
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{
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static char hex[] = "0123456789abcdef";
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return hex[code & 15];
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}
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// ensure caller frees
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char * url_escape(char * url)
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{
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char * ptr = url;
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char * buf = malloc(3 * strlen(url) + 1);
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char * ptr_buf = buf;
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while (*ptr)
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{
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if (isalnum((int)*ptr) || strchr("-_.~", *ptr))
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*ptr_buf++ = *ptr;
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else if (*ptr == ' ')
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*ptr_buf++ = '+';
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else
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{
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*ptr_buf++ = '%';
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*ptr_buf++ = to_hex(*ptr >> 4);
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*ptr_buf++ = to_hex(*ptr & 15);
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}
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ptr++;
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}
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*ptr_buf = '\0';
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return buf;
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}
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// ensure caller frees
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char * url_unescape(char * url)
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{
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char * ptr = url;
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char * buf = malloc(strlen(url) + 1);
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char * ptr_buf = buf;
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while (*ptr)
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{
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if (*ptr == '%')
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{
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if (ptr[1] && ptr[2])
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{
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*ptr_buf++ = from_hex(ptr[1]) << 4 | from_hex(ptr[2]);
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ptr += 2;
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}
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}
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else if (*ptr == '+')
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*ptr_buf++ = ' ';
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else
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*ptr_buf++ = *ptr;
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ptr++;
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}
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*ptr_buf = '\0';
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return buf;
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}
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