mirror of
https://github.com/cryb-to/cryb-to.git
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79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/*-
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* Copyright (c) 2014 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include <cryb/ctype.h>
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#include <cryb/rfc3986.h>
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#define unhex(ch) \
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((ch >= '0' && ch <= '9') ? ch - '0' : \
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(ch >= 'A' && ch <= 'F') ? 0xa + ch - 'A' : \
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(ch >= 'a' && ch <= 'f') ? 0xa + ch - 'a' : 0)
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/*
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* Decodes a string in RFC 3986 percent-encoded representation.
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*/
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int
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percent_decode(const char *in, size_t ilen, char *out, size_t *olen)
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{
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size_t len;
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for (len = 0; ilen > 0 && *in != '\0'; --ilen, ++in) {
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if (*in != '%') {
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if (++len < *olen && out != NULL)
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*out++ = *in;
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} else if (ilen >= 3 && is_xdigit(in[1]) && is_xdigit(in[2])) {
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if (++len < *olen && out != NULL)
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*out++ = unhex(in[1]) << 4 | unhex(in[2]);
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in += 2;
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ilen -= 2;
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} else {
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if (*olen > 0 && out != NULL)
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*out = '\0';
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*olen = ++len;
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errno = EINVAL;
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return (-1);
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}
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}
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if (*olen > 0 && out != NULL)
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*out = '\0';
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if (++len > *olen && out != NULL) {
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/* overflow */
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*olen = len;
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errno = ENOSPC;
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return (-1);
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}
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*olen = len;
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return (0);
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}
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