101 lines
3.3 KiB
C
101 lines
3.3 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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* $Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <sys/types.h>
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#include <string.h>
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#include "openpam_ctype.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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* OATH
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*
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* Decodes a URI-encoded string.
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*/
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size_t
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oath_uri_decode(const char *in, size_t ilen, char *out, size_t olen)
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{
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size_t ipos, opos;
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if (ilen == 0)
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ilen = strlen(in);
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for (ipos = opos = 0; ipos < ilen && in[ipos] != '\0'; ++ipos, ++opos) {
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if (in[ipos] == '%' && ipos + 2 < ilen &&
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is_xdigit(in[ipos + 1]) && is_xdigit(in[ipos + 2])) {
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if (out != NULL && opos < olen - 1)
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out[opos] = unhex(in[ipos + 1]) * 16 +
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unhex(in[ipos + 2]);
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ipos += 2;
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} else {
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if (out != NULL && opos < olen - 1)
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out[opos] = in[ipos];
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}
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}
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if (out != NULL && olen > 0)
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out[opos < olen ? opos : olen - 1] = '\0';
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return (opos + 1);
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}
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/**
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* The =oath_uri_decode function decodes a URI-encoded ("percent-encoded")
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* string.
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*
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* The =in parameter points to the string to be decoded, and the =ilen
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* parameter is its length. If =ilen is 0, =oath_uri_decode will decode
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* the entire string.
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*
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* The =out parameter points to a buffer in which the decoded data is to
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* be stored; the =olen parameter is the size of that buffer. If =out is
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* =NULL, the decoded data is discarded, but =oath_uri_decode still counts
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* the amount of space needed to store it.
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*
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* The output buffer is always NUL-terminated, regardless of how much or
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* how little data was decoded.
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*
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* RETURN VALUES
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*
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* The =oath_uri_decode funtion always returns the amount of space
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* required to store the entire decoded string, including the terminating
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* NUL. This may exceed the actual size of the output buffer.
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*
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* AUTHOR UIO
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*/
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