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gimp/plug-ins/metadata/xmp-encode.c

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/* xmp-encode.c - generate XMP metadata from the tree model
*
* Copyright (C) 2005, Raphaël Quinet <raphael@gimp.org>
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include "libgimp/stdplugins-intl.h"
#include "xmp-encode.h"
#include "xmp-schemas.h"
static void gen_element (GString *buffer,
gint indent,
const gchar *prefix,
const gchar *name,
const gchar *value,
...) G_GNUC_NULL_TERMINATED;
static void
gen_schema_start (GString *buffer,
const XMPSchema *schema)
{
g_string_append_printf (buffer, " <rdf:Description xmlns:%s='%s'>\n",
schema->prefix, schema->uri);
}
static void
gen_schema_end (GString *buffer)
{
g_string_append (buffer, " </rdf:Description>\n\n");
}
static void
gen_element (GString *buffer,
gint indent,
const gchar *prefix,
const gchar *name,
const gchar *value,
...)
{
const gchar *attr_name;
const gchar *attr_value;
gchar *utf8 = NULL;
va_list args;
while (indent--)
g_string_append_c (buffer, ' ');
g_string_append_printf (buffer, "<%s:%s", prefix, name);
va_start (args, value);
while ((attr_name = va_arg (args, const gchar *)) != NULL &&
(attr_value = va_arg (args, const gchar *)) != NULL)
{
if (*attr_name && *attr_value)
g_string_append_printf (buffer, " %s='%s'", attr_name, attr_value);
}
va_end (args);
if (value && *value)
utf8 = gimp_any_to_utf8 (value, -1, NULL);
if (utf8 && *utf8)
{
gchar *escaped_value = g_markup_escape_text (utf8, -1);
g_string_append_printf (buffer, ">%s</%s:%s>\n",
escaped_value, prefix, name);
g_free (escaped_value);
}
else
{
g_string_append (buffer, " />\n");
}
g_free (utf8);
}
static void
gen_property (GString *buffer,
const XMPSchema *schema,
const XMPProperty *property,
const gchar **value_array)
{
gint i;
const gchar *ns_prefix;
switch (property->type)
{
case XMP_TYPE_BOOLEAN:
case XMP_TYPE_DATE:
case XMP_TYPE_INTEGER:
case XMP_TYPE_REAL:
case XMP_TYPE_MIME_TYPE:
case XMP_TYPE_TEXT:
case XMP_TYPE_RATIONAL:
gen_element (buffer, 2,
schema->prefix, property->name, value_array[0],
NULL);
break;
case XMP_TYPE_LOCALE_BAG:
case XMP_TYPE_TEXT_BAG:
case XMP_TYPE_XPATH_BAG:
case XMP_TYPE_JOB_BAG:
g_string_append_printf (buffer, " <%s:%s>\n <rdf:Bag>\n",
schema->prefix, property->name);
for (i = 0; value_array[i] != NULL; i++)
{
gen_element (buffer, 4,
"rdf", "li", value_array[i],
NULL);
}
g_string_append_printf (buffer, " </rdf:Bag>\n </%s:%s>\n",
schema->prefix, property->name);
break;
case XMP_TYPE_INTEGER_SEQ:
case XMP_TYPE_TEXT_SEQ:
case XMP_TYPE_RESOURCE_EVENT_SEQ:
case XMP_TYPE_RATIONAL_SEQ:
g_string_append_printf (buffer, " <%s:%s>\n <rdf:Seq>\n",
schema->prefix, property->name);
for (i = 0; value_array[i] != NULL; i++)
{
gen_element (buffer, 4,
"rdf", "li", value_array[i],
NULL);
}
g_string_append_printf (buffer, " </rdf:Seq>\n </%s:%s>\n",
schema->prefix, property->name);
break;
case XMP_TYPE_LANG_ALT:
g_string_append_printf (buffer, " <%s:%s>\n <rdf:Alt>\n",
schema->prefix, property->name);
gen_element (buffer, 4,
"rdf", "li", value_array[0],
"xml:lang", "x-default",
NULL);
g_string_append_printf (buffer, " </rdf:Alt>\n </%s:%s>\n",
schema->prefix, property->name);
break;
case XMP_TYPE_URI:
gen_element (buffer, 2,
schema->prefix, property->name, NULL,
"rdf:resource", value_array[0],
NULL);
break;
case XMP_TYPE_GPS_COORDINATE:
gen_element (buffer, 2,
schema->prefix, property->name, value_array[0],
NULL);
break;
case XMP_TYPE_RESOURCE_REF:
case XMP_TYPE_DIMENSIONS:
case XMP_TYPE_FLASH:
case XMP_TYPE_OECF_SFR:
case XMP_TYPE_CFA_PATTERN:
case XMP_TYPE_DEVICE_SETTINGS:
case XMP_TYPE_CONTACT_INFO:
case XMP_TYPE_GENERIC_STRUCTURE:
if (value_array[0] && value_array[1]
&& !! strcmp (value_array[1], schema->uri))
{
g_string_append_printf (buffer,
" <%s:%s rdf:parseType='Resource'\n"
" xmlns:%s='%s'>\n",
schema->prefix, property->name,
value_array[0], value_array[1]);
ns_prefix = value_array[0];
}
else
{
g_string_append_printf (buffer,
" <%s:%s rdf:parseType='Resource'>\n",
schema->prefix, property->name);
ns_prefix = schema->prefix;
}
if (value_array[0] && value_array[1])
for (i = 2; value_array[i] != NULL; i += 2)
{
gen_element (buffer, 3,
ns_prefix, value_array[i], value_array[i + 1],
NULL);
}
g_string_append_printf (buffer, " </%s:%s>\n",
schema->prefix, property->name);
break;
case XMP_TYPE_THUMBNAIL_ALT:
g_printerr ("FIXME: output not implemented yet (%s:%s)",
schema->prefix, property->name);
break;
case XMP_TYPE_UNKNOWN:
g_printerr ("Unknown property type for %s", property->name);
break;
}
}
/**
* xmp_generate_block:
* @xmp_model: An #XMPModel
* @buffer: A #GString in which the generated XMP packet will be stored.
*
* Generate XMP packet from xmp_model and store it in the supplied buffer.
*
*/
void
xmp_generate_packet (XMPModel *xmp_model,
GString *buffer)
{
GtkTreeModel *model;
GtkTreeIter iter;
GtkTreeIter child;
const XMPSchema *schema;
gpointer saved_ref;
g_return_if_fail (xmp_model != NULL);
g_return_if_fail (buffer != NULL);
model = xmp_model_get_tree_model (xmp_model);
g_return_if_fail (model != NULL);
if (! buffer)
buffer = g_string_new (NULL);
buffer = g_string_append (buffer,
"<?xpacket begin='\357\273\277' id='W5M0MpCehiHzreSzNTczkc9d'?>\n"
"<x:xmpmeta xmlns:x='adobe:ns:meta/'>\n"
"<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>\n"
"\n");
/* generate the contents of the XMP packet */
if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (model), &iter))
{
do
{
gtk_tree_model_get (model, &iter,
COL_XMP_TYPE_XREF, &schema,
-1);
gen_schema_start (buffer, schema);
if (gtk_tree_model_iter_children (model, &child, &iter))
{
saved_ref = NULL;
do
{
const XMPProperty *property;
const gchar **value_array;
gtk_tree_model_get (model, &child,
COL_XMP_TYPE_XREF, &property,
COL_XMP_VALUE_RAW, &value_array,
-1);
/* do not process structured types multiple times */
if (saved_ref != value_array)
{
saved_ref = value_array;
g_return_if_fail (property->name != NULL);
gen_property (buffer, schema, property, value_array);
}
}
while (gtk_tree_model_iter_next (model, &child));
}
gen_schema_end (buffer);
}
while (gtk_tree_model_iter_next (model, &iter));
}
g_string_append (buffer, "</rdf:RDF>\n</x:xmpmeta>\n<?xpacket end='r'?>\n");
}
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