409 lines
10 KiB
C
409 lines
10 KiB
C
/* PIKA - Photo and Image Kooker Application
|
|
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
|
|
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
|
|
*
|
|
* Original copyright, applying to most contents (license remains unchanged):
|
|
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
|
|
*
|
|
* PikaXmlParser
|
|
* Copyright (C) 2003 Sven Neumann <sven@gimp.org>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include <gio/gio.h>
|
|
|
|
#include "config-types.h"
|
|
|
|
#include "pikaxmlparser.h"
|
|
|
|
|
|
struct _PikaXmlParser
|
|
{
|
|
GMarkupParseContext *context;
|
|
};
|
|
|
|
|
|
static gboolean parse_encoding (const gchar *text,
|
|
gint text_len,
|
|
gchar **encodind);
|
|
|
|
|
|
/**
|
|
* pika_xml_parser_new:
|
|
* @markup_parser: a #GMarkupParser
|
|
* @user_data: user data to pass to #GMarkupParser functions
|
|
*
|
|
* PikaXmlParser is a thin wrapper around GMarkupParser. This function
|
|
* creates one for you and sets up a GMarkupParseContext.
|
|
*
|
|
* Returns: a new #PikaXmlParser
|
|
**/
|
|
PikaXmlParser *
|
|
pika_xml_parser_new (const GMarkupParser *markup_parser,
|
|
gpointer user_data)
|
|
{
|
|
PikaXmlParser *parser;
|
|
|
|
g_return_val_if_fail (markup_parser != NULL, NULL);
|
|
|
|
parser = g_slice_new (PikaXmlParser);
|
|
|
|
parser->context = g_markup_parse_context_new (markup_parser,
|
|
0, user_data, NULL);
|
|
|
|
return parser;
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_parse_file:
|
|
* @parser: a #PikaXmlParser
|
|
* @filename: name of a file to parse
|
|
* @error: return location for possible errors
|
|
*
|
|
* This function creates a GIOChannel for @filename and calls
|
|
* pika_xml_parser_parse_io_channel() for you.
|
|
*
|
|
* Returns: %TRUE on success, %FALSE otherwise
|
|
**/
|
|
gboolean
|
|
pika_xml_parser_parse_file (PikaXmlParser *parser,
|
|
const gchar *filename,
|
|
GError **error)
|
|
{
|
|
GIOChannel *io;
|
|
gboolean success;
|
|
|
|
g_return_val_if_fail (parser != NULL, FALSE);
|
|
g_return_val_if_fail (filename != NULL, FALSE);
|
|
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
|
|
|
io = g_io_channel_new_file (filename, "r", error);
|
|
if (!io)
|
|
return FALSE;
|
|
|
|
success = pika_xml_parser_parse_io_channel (parser, io, error);
|
|
|
|
g_io_channel_unref (io);
|
|
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_parse_gfile:
|
|
* @parser: a #PikaXmlParser
|
|
* @file: the #GFile to parse
|
|
* @error: return location for possible errors
|
|
*
|
|
* This function creates a GIOChannel for @file and calls
|
|
* pika_xml_parser_parse_io_channel() for you.
|
|
*
|
|
* Returns: %TRUE on success, %FALSE otherwise
|
|
**/
|
|
gboolean
|
|
pika_xml_parser_parse_gfile (PikaXmlParser *parser,
|
|
GFile *file,
|
|
GError **error)
|
|
{
|
|
gchar *path;
|
|
gboolean success;
|
|
|
|
g_return_val_if_fail (parser != NULL, FALSE);
|
|
g_return_val_if_fail (G_IS_FILE (file), FALSE);
|
|
|
|
path = g_file_get_path (file);
|
|
|
|
success = pika_xml_parser_parse_file (parser, path, error);
|
|
|
|
g_free (path);
|
|
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_parse_fd:
|
|
* @parser: a #PikaXmlParser
|
|
* @fd: a file descriptor
|
|
* @error: return location for possible errors
|
|
*
|
|
* This function creates a GIOChannel for @fd and calls
|
|
* pika_xml_parser_parse_io_channel() for you.
|
|
*
|
|
* Returns: %TRUE on success, %FALSE otherwise
|
|
**/
|
|
gboolean
|
|
pika_xml_parser_parse_fd (PikaXmlParser *parser,
|
|
gint fd,
|
|
GError **error)
|
|
{
|
|
GIOChannel *io;
|
|
gboolean success;
|
|
|
|
g_return_val_if_fail (parser != NULL, FALSE);
|
|
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
|
|
|
#ifdef G_OS_WIN32
|
|
io = g_io_channel_win32_new_fd (fd);
|
|
#else
|
|
io = g_io_channel_unix_new (fd);
|
|
#endif
|
|
|
|
success = pika_xml_parser_parse_io_channel (parser, io, error);
|
|
|
|
g_io_channel_unref (io);
|
|
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_parse_io_channel:
|
|
* @parser: a #PikaXmlParser
|
|
* @io: a #GIOChannel
|
|
* @error: return location for possible errors
|
|
*
|
|
* Makes @parser read from the specified @io channel. This function
|
|
* returns when the GIOChannel becomes empty (end of file) or an
|
|
* error occurs, either reading from @io or parsing the read data.
|
|
*
|
|
* This function tries to determine the character encoding from the
|
|
* XML header and converts the content to UTF-8 for you. For this
|
|
* feature to work, the XML header with the encoding attribute must be
|
|
* contained in the first 4096 bytes read. Otherwise UTF-8 encoding
|
|
* will be assumed and parsing may break later if this assumption
|
|
* was wrong.
|
|
*
|
|
* Returns: %TRUE on success, %FALSE otherwise
|
|
**/
|
|
gboolean
|
|
pika_xml_parser_parse_io_channel (PikaXmlParser *parser,
|
|
GIOChannel *io,
|
|
GError **error)
|
|
{
|
|
GIOStatus status;
|
|
gchar buffer[4096];
|
|
gsize len = 0;
|
|
gsize bytes;
|
|
const gchar *io_encoding;
|
|
gchar *encoding = NULL;
|
|
|
|
g_return_val_if_fail (parser != NULL, FALSE);
|
|
g_return_val_if_fail (io != NULL, FALSE);
|
|
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
|
|
|
io_encoding = g_io_channel_get_encoding (io);
|
|
if (g_strcmp0 (io_encoding, "UTF-8"))
|
|
{
|
|
g_warning ("pika_xml_parser_parse_io_channel():\n"
|
|
"The encoding has already been set on this GIOChannel!");
|
|
return FALSE;
|
|
}
|
|
|
|
/* try to determine the encoding */
|
|
|
|
g_io_channel_set_encoding (io, NULL, NULL);
|
|
|
|
while (len < sizeof (buffer))
|
|
{
|
|
status = g_io_channel_read_chars (io, buffer + len, 1, &bytes, error);
|
|
len += bytes;
|
|
|
|
if (status == G_IO_STATUS_ERROR)
|
|
return FALSE;
|
|
if (status == G_IO_STATUS_EOF)
|
|
break;
|
|
|
|
if (parse_encoding (buffer, len, &encoding))
|
|
break;
|
|
}
|
|
|
|
if (encoding)
|
|
{
|
|
if (! g_io_channel_set_encoding (io, encoding, error))
|
|
return FALSE;
|
|
|
|
g_free (encoding);
|
|
}
|
|
else
|
|
{
|
|
g_io_channel_set_encoding (io, "UTF-8", NULL);
|
|
}
|
|
|
|
while (TRUE)
|
|
{
|
|
if (!g_markup_parse_context_parse (parser->context, buffer, len, error))
|
|
return FALSE;
|
|
|
|
status = g_io_channel_read_chars (io,
|
|
buffer, sizeof (buffer), &len, error);
|
|
|
|
switch (status)
|
|
{
|
|
case G_IO_STATUS_ERROR:
|
|
return FALSE;
|
|
case G_IO_STATUS_EOF:
|
|
return g_markup_parse_context_end_parse (parser->context, error);
|
|
case G_IO_STATUS_NORMAL:
|
|
case G_IO_STATUS_AGAIN:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_parse_buffer:
|
|
* @parser: a #PikaXmlParser
|
|
* @buffer: a string buffer
|
|
* @len: the number of byes in @buffer or -1 if @buffer is nul-terminated
|
|
* @error: return location for possible errors
|
|
*
|
|
* This function uses the given @parser to parse the XML in @buffer.
|
|
*
|
|
* Returns: %TRUE on success, %FALSE otherwise
|
|
**/
|
|
gboolean
|
|
pika_xml_parser_parse_buffer (PikaXmlParser *parser,
|
|
const gchar *buffer,
|
|
gssize len,
|
|
GError **error)
|
|
{
|
|
gchar *encoding = NULL;
|
|
gchar *conv = NULL;
|
|
gboolean success;
|
|
|
|
g_return_val_if_fail (parser != NULL, FALSE);
|
|
g_return_val_if_fail (buffer != NULL || len == 0, FALSE);
|
|
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
|
|
|
if (len < 0)
|
|
len = strlen (buffer);
|
|
|
|
if (parse_encoding (buffer, len, &encoding) && encoding)
|
|
{
|
|
if (g_ascii_strcasecmp (encoding, "UTF-8") &&
|
|
g_ascii_strcasecmp (encoding, "UTF8"))
|
|
{
|
|
gsize written;
|
|
|
|
conv = g_convert (buffer, len,
|
|
"UTF-8", encoding, NULL, &written, error);
|
|
if (! conv)
|
|
{
|
|
g_free (encoding);
|
|
return FALSE;
|
|
}
|
|
|
|
len = written;
|
|
}
|
|
|
|
g_free (encoding);
|
|
}
|
|
|
|
success = g_markup_parse_context_parse (parser->context,
|
|
conv ? conv : buffer, len, error);
|
|
|
|
if (conv)
|
|
g_free (conv);
|
|
|
|
return success;
|
|
}
|
|
|
|
/**
|
|
* pika_xml_parser_free:
|
|
* @parser: a #PikaXmlParser
|
|
*
|
|
* Frees the resources allocated for @parser. You must not access
|
|
* @parser after calling this function.
|
|
**/
|
|
void
|
|
pika_xml_parser_free (PikaXmlParser *parser)
|
|
{
|
|
g_return_if_fail (parser != NULL);
|
|
|
|
g_markup_parse_context_free (parser->context);
|
|
g_slice_free (PikaXmlParser, parser);
|
|
}
|
|
|
|
|
|
/* Try to determine encoding from XML header. This function returns
|
|
FALSE when it doesn't have enough text to parse. It returns TRUE
|
|
and sets encoding when the XML header has been parsed.
|
|
*/
|
|
static gboolean
|
|
parse_encoding (const gchar *text,
|
|
gint text_len,
|
|
gchar **encoding)
|
|
{
|
|
const gchar *start;
|
|
const gchar *end;
|
|
gint i;
|
|
|
|
g_return_val_if_fail (text, FALSE);
|
|
|
|
if (text_len < 20)
|
|
return FALSE;
|
|
|
|
start = g_strstr_len (text, text_len, "<?xml");
|
|
if (!start)
|
|
return FALSE;
|
|
|
|
end = g_strstr_len (start, text_len - (start - text), "?>");
|
|
if (!end)
|
|
return FALSE;
|
|
|
|
*encoding = NULL;
|
|
|
|
text_len = end - start;
|
|
if (text_len < 12)
|
|
return TRUE;
|
|
|
|
start = g_strstr_len (start + 1, text_len - 1, "encoding");
|
|
if (!start)
|
|
return TRUE;
|
|
|
|
start += 8;
|
|
|
|
while (start < end && *start == ' ')
|
|
start++;
|
|
|
|
if (*start != '=')
|
|
return TRUE;
|
|
|
|
start++;
|
|
|
|
while (start < end && *start == ' ')
|
|
start++;
|
|
|
|
if (*start != '\"' && *start != '\'')
|
|
return TRUE;
|
|
|
|
text_len = end - start;
|
|
if (text_len < 1)
|
|
return TRUE;
|
|
|
|
for (i = 1; i < text_len; i++)
|
|
if (start[i] == start[0])
|
|
break;
|
|
|
|
if (i == text_len || i < 3)
|
|
return TRUE;
|
|
|
|
*encoding = g_strndup (start + 1, i - 1);
|
|
|
|
return TRUE;
|
|
}
|
