391 lines
10 KiB
C
391 lines
10 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* The PIKA Help Browser - URI functions
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* Copyright (C) 2001 Jacob Schroeder <jacob@convergence.de>
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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 <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <glib.h>
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#include "uri.h"
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/* #define URI_DEBUG 1 */
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typedef enum
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{
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URI_UNKNOWN,
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URI_ABSURI,
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URI_NETPATH,
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URI_ABSPATH,
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URI_RELPATH,
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URI_QUERY,
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URI_EMPTY,
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URI_FRAGMENT,
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URI_INVALID
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} UriType;
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static UriType
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uri_get_type (const gchar *uri)
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{
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gchar c;
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const gchar *cptr;
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UriType type = URI_UNKNOWN;
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if (!uri)
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return type;
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cptr = uri;
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c = *cptr++;
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if (g_ascii_isalpha (c))
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{
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type = URI_RELPATH; /* assume relative path */
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while ((c = *cptr++))
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{
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if (g_ascii_isalnum (c) || c == '+' || c == '-' || c == '.')
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continue;
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if (c == ':')
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{
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/* it was a scheme */
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type = URI_ABSURI;
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}
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break;
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}
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}
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else
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{
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switch (c)
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{
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case '/':
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if (*cptr == '/')
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{
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cptr++;
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type = URI_NETPATH;
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}
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else
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{
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type = URI_ABSPATH;
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}
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break;
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case '?':
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type = URI_QUERY;
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break;
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case '#':
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type = URI_FRAGMENT;
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break;
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case '\0':
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type = URI_EMPTY;
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break;
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default:
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type = URI_RELPATH;
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break;
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}
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}
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#ifdef URI_DEBUG
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g_print ("uri_get_type (\"%s\") -> ", uri);
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switch (type)
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{
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case URI_UNKNOWN: g_print ("unknown"); break;
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case URI_ABSURI: g_print ("absuri"); break;
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case URI_NETPATH: g_print ("netpath"); break;
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case URI_ABSPATH: g_print ("abspath"); break;
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case URI_RELPATH: g_print ("relpath"); break;
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case URI_QUERY: g_print ("query"); break;
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case URI_EMPTY: g_print ("empty"); break;
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case URI_FRAGMENT: g_print ("fragment"); break;
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case URI_INVALID: g_print ("invalid"); break;
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}
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g_print ("\n");
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#endif
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return type;
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}
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gchar *
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uri_to_abs (const gchar *uri,
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const gchar *base_uri)
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{
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gchar c;
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const gchar *cptr;
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gchar *retval = NULL;
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UriType uri_type = URI_UNKNOWN;
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UriType base_type = URI_UNKNOWN;
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gint base_cnt = 0; /* no of chars to be copied from base URI */
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gint uri_cnt = 0; /* no of chars to be copied from URI */
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gint sep_cnt = 0; /* no of chars to be inserted between them */
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const gchar *sep_str = ""; /* string to insert between base and uri */
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const gchar *part;
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const gchar *last_segment = NULL;
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#ifdef URI_DEBUG
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g_print ("uri_to_abs (\"%s\", \"%s\")\n", uri, base_uri);
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#endif
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/* this function does not use the algorithm that is being proposed
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* in RFC 2396. Instead it analyses the first characters of each
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* URI to determine its kind (abs, net, path, ...).
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* After that it locates the missing parts in the base URI and then
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* concats everything into a newly allocated string.
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*/
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/* determine the kind of the URIs */
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uri_type = uri_get_type (uri);
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if (uri_type != URI_ABSURI)
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{
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base_type = uri_get_type (base_uri);
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if (base_type != URI_ABSURI)
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return NULL; /* neither uri nor base uri are absolute */
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}
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/* find missing parts in base URI */
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switch (uri_type)
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{
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case URI_ABSURI:
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/* base uri not needed */
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break;
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case URI_QUERY:
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/* ??? last segment? */
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uri_type = URI_RELPATH;
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case URI_NETPATH: /* base scheme */
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case URI_ABSPATH: /* base scheme and authority */
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case URI_RELPATH: /* base scheme, authority and path */
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cptr = base_uri;
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/* skip scheme */
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while ((c = *cptr++) && c != ':')
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; /* nada */
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base_cnt = cptr - base_uri; /* incl : */
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if (*cptr != '/')
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{
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/* completion not possible */
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return NULL;
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}
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if (uri_type == URI_NETPATH)
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break;
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/* skip authority */
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if (cptr[0] == '/' && cptr[1] == '/')
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{
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part = cptr;
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cptr += 2;
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while ((c = *cptr++) && c != '/' && c != '?' && c != '#')
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; /* nada */
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cptr--;
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base_cnt += cptr - part;
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}
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if (uri_type == URI_ABSPATH)
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break;
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/* skip path */
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if (*cptr != '/')
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{
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sep_cnt = 1;
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sep_str = "/";
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break;
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}
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part = cptr;
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g_assert (*cptr == '/');
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while ((c = *cptr++) && c != '?' && c != '#')
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{
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if (c == '/')
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last_segment = cptr - 1;
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};
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g_assert (last_segment);
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cptr = last_segment;
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while ((c = *uri) && c == '.' && cptr > part)
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{
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gint shift_segment = 0;
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c = uri[1];
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if (c == '.' )
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{
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c = uri[2];
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shift_segment = 1;
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}
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if (c == '/')
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{
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uri += 2;
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}
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else if (c == 0 || c == '?' || c == '#')
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{
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uri += 1;
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}
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else
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{
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break;
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}
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g_assert (*cptr == '/');
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if (shift_segment)
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{
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uri += 1;
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while (cptr > part && *--cptr != '/')
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; /* nada */
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}
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}
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base_cnt += cptr - part + 1;
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break;
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case URI_EMPTY:
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case URI_FRAGMENT:
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/* use whole base uri */
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base_cnt = strlen (base_uri);
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break;
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case URI_UNKNOWN:
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case URI_INVALID:
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return NULL;
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}
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/* do not include fragment part from the URI reference */
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for (cptr = uri; (c = *cptr) && c != '#'; cptr++)
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; /* nada */
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uri_cnt = cptr - uri;
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/* allocate string and copy characters */
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retval = g_new (gchar, base_cnt + sep_cnt + uri_cnt + 1);
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if (base_cnt)
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strncpy (retval, base_uri, base_cnt);
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if (sep_cnt)
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strncpy (retval + base_cnt, sep_str, sep_cnt);
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if (uri_cnt)
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strncpy (retval + base_cnt + sep_cnt, uri, uri_cnt);
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retval[base_cnt + sep_cnt + uri_cnt] = '\0';
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#ifdef URI_DEBUG
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g_print (" -> \"%s\"\n", retval);
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#endif
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return retval;
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}
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#if 0
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RFC 2396 URI Generic Syntax August 1998
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A. Collected BNF for URI
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URI-reference = [ absoluteURI | relativeURI ] [ "#" fragment ]
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absoluteURI = scheme ":" ( hier_part | opaque_part )
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relativeURI = ( net_path | abs_path | rel_path ) [ "?" query ]
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hier_part = ( net_path | abs_path ) [ "?" query ]
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opaque_part = uric_no_slash *uric
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uric_no_slash = unreserved | escaped | ";" | "?" | ":" | "@" |
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"&" | "=" | "+" | "$" | ","
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net_path = "//" authority [ abs_path ]
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abs_path = "/" path_segments
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rel_path = rel_segment [ abs_path ]
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rel_segment = 1*( unreserved | escaped |
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";" | "@" | "&" | "=" | "+" | "$" | "," )
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scheme = alpha *( alpha | digit | "+" | "-" | "." )
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authority = server | reg_name
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reg_name = 1*( unreserved | escaped | "$" | "," |
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";" | ":" | "@" | "&" | "=" | "+" )
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server = [ [ userinfo "@" ] hostport ]
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userinfo = *( unreserved | escaped |
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";" | ":" | "&" | "=" | "+" | "$" | "," )
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hostport = host [ ":" port ]
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host = hostname | IPv4address
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hostname = *( domainlabel "." ) toplabel [ "." ]
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domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
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toplabel = alpha | alpha *( alphanum | "-" ) alphanum
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IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
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port = *digit
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path = [ abs_path | opaque_part ]
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path_segments = segment *( "/" segment )
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segment = *pchar *( ";" param )
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param = *pchar
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pchar = unreserved | escaped |
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":" | "@" | "&" | "=" | "+" | "$" | ","
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query = *uric
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fragment = *uric
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uric = reserved | unreserved | escaped
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reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
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"$" | ","
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unreserved = alphanum | mark
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mark = "-" | "_" | "." | "!" | "~" | "*" | "'" |
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"(" | ")"
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escaped = "%" hex hex
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hex = digit | "A" | "B" | "C" | "D" | "E" | "F" |
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"a" | "b" | "c" | "d" | "e" | "f"
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alphanum = alpha | digit
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alpha = lowalpha | upalpha
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lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" |
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"j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" |
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"s" | "t" | "u" | "v" | "w" | "x" | "y" | "z"
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upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" |
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"J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" |
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"S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z"
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digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
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"8" | "9"
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#endif
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