mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-12-24 13:31:08 +00:00
110 lines
3 KiB
C
110 lines
3 KiB
C
/*-
|
|
* Copyright (c) 2014 Dag-Erling Smørgrav
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "cryb/impl.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include <cryb/ctype.h>
|
|
#include <cryb/rfc3986.h>
|
|
|
|
static const char hex[] = "0123456789ABCDEF";
|
|
|
|
#define unhex(ch) \
|
|
((ch >= '0' && ch <= '9') ? ch - '0' : \
|
|
(ch >= 'A' && ch <= 'F') ? 0xa + ch - 'A' : \
|
|
(ch >= 'a' && ch <= 'f') ? 0xa + ch - 'a' : 0)
|
|
|
|
/*
|
|
* Encodes a string in RFC 3986 percent-encoded representation.
|
|
*/
|
|
int
|
|
percent_encode(const char *in, size_t ilen, char *out, size_t *olen)
|
|
{
|
|
size_t len;
|
|
|
|
for (len = 0; ilen && *in; --ilen, ++in) {
|
|
if (is_uri(*in)) {
|
|
if (len++ < *olen)
|
|
*out++ = *in;
|
|
} else {
|
|
if (len++ < *olen)
|
|
*out++ = '%';
|
|
if (len++ < *olen)
|
|
*out++ = hex[(uint8_t)*in >> 4];
|
|
if (len++ < *olen)
|
|
*out++ = hex[(uint8_t)*in & 0xf];
|
|
}
|
|
}
|
|
if (len < *olen)
|
|
*out = '\0';
|
|
if (len >= *olen) {
|
|
/* overflow */
|
|
*olen = len;
|
|
errno = ENOSPC;
|
|
return (-1);
|
|
}
|
|
*olen = len;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Decodes a string in RFC 3986 percent-encoded representation.
|
|
*/
|
|
int
|
|
percent_decode(const char *in, size_t ilen, char *out, size_t *olen)
|
|
{
|
|
size_t len;
|
|
|
|
for (len = 0; ilen && *in; --ilen, ++in) {
|
|
if (*in != '%') {
|
|
if (++len < *olen)
|
|
*out++ = *in;
|
|
} else if (ilen >= 3 && is_xdigit(in[1]) && is_xdigit(in[2])) {
|
|
if (++len < *olen)
|
|
*out++ = unhex(in[1]) << 4 | unhex(in[2]);
|
|
in += 2;
|
|
} else {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
}
|
|
if (len < *olen)
|
|
*out = '\0';
|
|
if (len >= *olen) {
|
|
/* overflow */
|
|
*olen = len;
|
|
errno = ENOSPC;
|
|
return (-1);
|
|
}
|
|
*olen = len;
|
|
return (0);
|
|
}
|