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// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.
#include "mupdf/fitz.h"
#include "xps-imp.h"
static inline int xps_tolower(int c)
{
if (c >= 'A' && c <= 'Z')
return c + 32;
return c;
}
int
xps_strcasecmp(char *a, char *b)
{
while (xps_tolower(*a) == xps_tolower(*b))
{
if (*a++ == 0)
return 0;
b++;
}
return xps_tolower(*a) - xps_tolower(*b);
}
/* A URL is defined as consisting of a:
* SCHEME (e.g. http:)
* AUTHORITY (username, password, hostname, port, eg //test:passwd@mupdf.com:999)
* PATH (e.g. /download)
* QUERY (e.g. ?view=page)
* FRAGMENT (e.g. #fred) (not strictly part of the URL)
*/
static char *
skip_scheme(char *path)
{
char *p = path;
/* Skip over: alpha *(alpha | digit | "+" | "-" | ".") looking for : */
if (*p >= 'a' && *p <= 'z')
{
/* Starts with a-z */
}
else if (*p >= 'A' && *p <= 'Z')
{
/* Starts with A-Z */
}
else
return path;
while (*++p)
{
if (*p >= 'a' && *p <= 'z')
continue;
if (*p >= 'A' && *p <= 'Z')
continue;
if (*p >= '0' && *p <= '9')
continue;
if (*p == '+')
continue;
if (*p == '-')
continue;
if (*p == '.')
continue;
if (*p == ':')
return p+1;
break;
}
return path;
}
static char *
skip_authority(char *path)
{
char *p = path;
/* Authority section must start with '//' */
if (p[0] != '/' || p[1] != '/')
return path;
p += 2;
/* Authority is terminated by end of URL, '/' or '?' */
while (*p && *p != '/' && *p != '?')
p++;
return p;
}
#define SEP(x) ((x)=='/' || (x) == 0)
static char *
clean_path(char *name)
{
char *p, *q, *dotdot, *start;
int rooted;
start = skip_scheme(name);
start = skip_authority(start);
rooted = start[0] == '/';
/*
* invariants:
* p points at beginning of path element we're considering.
* q points just past the last path element we wrote (no slash).
* dotdot points just past the point where .. cannot backtrack
* any further (no slash).
*/
p = q = dotdot = start + rooted;
while (*p)
{
if(p[0] == '/') /* null element */
p++;
else if (p[0] == '.' && SEP(p[1]))
p += 1; /* don't count the separator in case it is nul */
else if (p[0] == '.' && p[1] == '.' && SEP(p[2]))
{
p += 2;
if (q > dotdot) /* can backtrack */
{
while(--q > dotdot && *q != '/')
;
}
else if (!rooted) /* /.. is / but ./../ is .. */
{
if (q != start)
*q++ = '/';
*q++ = '.';
*q++ = '.';
dotdot = q;
}
}
else /* real path element */
{
if (q != start+rooted)
*q++ = '/';
while ((*q = *p) != '/' && *q != 0)
p++, q++;
}
}
/* Protect against 'blah:' input, where start = q = the terminator.
* We must not overrun it. */
if (q == start && *q != 0) /* empty string is really "." */
*q++ = '.';
*q = '\0';
return name;
}
void
xps_resolve_url(fz_context *ctx, xps_document *doc, char *output, char *base_uri, char *path, int output_size)
{
char *p = skip_authority(skip_scheme(path));
if (p != path || path[0] == '/')
{
fz_strlcpy(output, path, output_size);
}
else
{
size_t len = fz_strlcpy(output, base_uri, output_size);
if (len == 0 || output[len-1] != '/')
fz_strlcat(output, "/", output_size);
fz_strlcat(output, path, output_size);
}
clean_path(output);
}
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