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gimpmetadata.c
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/* LIBGIMPBASE - The GIMP Basic Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpmetadata.c
* Copyright (C) 2013 Hartmut Kuhse <[email protected]>
* Michael Natterer <[email protected]>
*
* 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gegl.h>
#include <gio/gio.h>
#include "libgimpmath/gimpmath.h"
#include "gimpbasetypes.h"
#include "gimplimits.h"
#include "gimpmetadata.h"
#include "gimpparamspecs.h"
#include "gimpunit.h"
#include "libgimp/libgimp-intl.h"
/**
* SECTION: gimpmetadata
* @title: GimpMetadata
* @short_description: Basic functions for handling #GimpMetadata objects.
*
* Basic functions for handling #GimpMetadata objects.
**/
struct _GimpMetadata
{
GExiv2Metadata parent_instance;
};
#define GIMP_METADATA_ERROR gimp_metadata_error_quark ()
static GQuark gimp_metadata_error_quark (void);
static void gimp_metadata_copy_tag (GExiv2Metadata *src,
GExiv2Metadata *dest,
const gchar *tag);
static void gimp_metadata_copy_tags (GExiv2Metadata *src,
GExiv2Metadata *dest,
const gchar **tags);
static void gimp_metadata_add (GimpMetadata *src,
GimpMetadata *dest);
static void gimp_metadata_add_namespace (GHashTable *namespaces,
GString *xml,
gchar *prefix);
static void gimp_metadata_add_xmp_namespaces (GHashTable *namespaces,
GString *xml,
const gchar *tag);
static const gchar *tiff_tags[] =
{
"Xmp.tiff",
"Exif.Image.ImageWidth",
"Exif.Image.ImageLength",
"Exif.Image.BitsPerSample",
"Exif.Image.Compression",
"Exif.Image.PhotometricInterpretation",
"Exif.Image.FillOrder",
"Exif.Image.SamplesPerPixel",
"Exif.Image.StripOffsets",
"Exif.Image.RowsPerStrip",
"Exif.Image.StripByteCounts",
"Exif.Image.PlanarConfiguration"
};
static const gchar *jpeg_tags[] =
{
"Exif.Image.JPEGProc",
"Exif.Image.JPEGInterchangeFormat",
"Exif.Image.JPEGInterchangeFormatLength",
"Exif.Image.JPEGRestartInterval",
"Exif.Image.JPEGLosslessPredictors",
"Exif.Image.JPEGPointTransforms",
"Exif.Image.JPEGQTables",
"Exif.Image.JPEGDCTables",
"Exif.Image.JPEGACTables"
};
static const gchar *unsupported_tags[] =
{
"Exif.Image.SubIFDs",
"Exif.Image.ClipPath",
"Exif.Image.XClipPathUnits",
"Exif.Image.YClipPathUnits",
"Exif.Image.XPTitle",
"Exif.Image.XPComment",
"Exif.Image.XPAuthor",
"Exif.Image.XPKeywords",
"Exif.Image.XPSubject",
"Exif.Image.DNGVersion",
"Exif.Image.DNGBackwardVersion",
"Exif.Iop",
/* FIXME Even though adding the tags below fixes the issue it's not very flexible.
It might be better in the long run if there was a way for a user to configure which
tags to block or a way for us to detect problems with tags before writing them. */
/* Issues #1367, #2253. Offending tag is PreviewOffset but the other Preview tags
(PreviewResolution, PreviewLength, PreviewImageBorders) also make no sense because
we are not including a Pentax specific preview image. */
"Exif.Pentax.Preview",
"Exif.PentaxDng.Preview",
/* Never save the complete brand specific MakerNote data. We load and
* should only save the specific brand tags inside the MakerNote.
* Sometimes the MakerNote is invalid or exiv2 doesn't know how to parse
* it. In that case we still get the (invalid) MakerNote, but not the
* individual tags or just a subset of them.
* If there are recognized brand specific tags, exiv2 will create the
* required MakerNote itself (which in can still be invalid but that's an
* exiv2 issue not ours). */
"Exif.Photo.MakerNote",
"Exif.MakerNote.ByteOrder",
"Exif.MakerNote.Offset",
/* Photoshop resources can contain sensitive data. We should not save the
* unedited original state. */
"Exif.Image.ImageResources",
"Exif.Image.0x935c",
/* Issue #12518 Metadata fails to be exported when certain Sony Exif tags
* are present. */
"Exif.SonyMisc3c",
};
static const guint8 minimal_exif[] =
{
0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
0x01, 0x01, 0x00, 0x5a, 0x00, 0x5a, 0x00, 0x00, 0xff, 0xe1
};
static const guint8 wilber_jpg[] =
{
0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
0x01, 0x01, 0x00, 0x5a, 0x00, 0x5a, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43,
0x00, 0x50, 0x37, 0x3c, 0x46, 0x3c, 0x32, 0x50, 0x46, 0x41, 0x46, 0x5a,
0x55, 0x50, 0x5f, 0x78, 0xc8, 0x82, 0x78, 0x6e, 0x6e, 0x78, 0xf5, 0xaf,
0xb9, 0x91, 0xc8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xdb, 0x00, 0x43, 0x01, 0x55, 0x5a,
0x5a, 0x78, 0x69, 0x78, 0xeb, 0x82, 0x82, 0xeb, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xc0, 0x00, 0x11, 0x08, 0x00, 0x10, 0x00, 0x10, 0x03,
0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xc4, 0x00,
0x16, 0x00, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x01, 0x02, 0xff, 0xc4, 0x00,
0x1e, 0x10, 0x00, 0x01, 0x05, 0x00, 0x02, 0x03, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x03, 0x11, 0x31,
0x04, 0x12, 0x51, 0x61, 0x71, 0xff, 0xc4, 0x00, 0x14, 0x01, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xff, 0xc4, 0x00, 0x14, 0x11, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11,
0x00, 0x3f, 0x00, 0x18, 0xa0, 0x0e, 0x6d, 0xbc, 0xf5, 0xca, 0xf7, 0x78,
0xb6, 0xfe, 0x3b, 0x23, 0xb2, 0x1d, 0x64, 0x68, 0xf0, 0x8a, 0x39, 0x4b,
0x74, 0x9c, 0xa5, 0x5f, 0x35, 0x8a, 0xb2, 0x7e, 0xa0, 0xff, 0xd9, 0x00
};
static const guint wilber_jpg_len = G_N_ELEMENTS (wilber_jpg);
G_DEFINE_TYPE (GimpMetadata, gimp_metadata, GEXIV2_TYPE_METADATA)
static void
gimp_metadata_class_init (GimpMetadataClass *klass)
{
GError *error = NULL;
if (! gexiv2_metadata_try_register_xmp_namespace ("http://ns.adobe.com/DICOM/",
"DICOM", &error))
{
g_printerr ("Failed to register XMP namespace 'DICOM': %s\n", error->message);
g_clear_error (&error);
}
if (! gexiv2_metadata_try_register_xmp_namespace ("http://darktable.sf.net/",
"darktable", &error))
{
g_printerr ("Failed to register XMP namespace 'darktable': %s\n", error->message);
g_clear_error (&error);
}
/* Usage example Xmp.GIMP.tagname */
if (! gexiv2_metadata_try_register_xmp_namespace ("http://www.gimp.org/xmp/",
"GIMP", &error))
{
g_printerr ("Failed to register XMP namespace 'GIMP': %s\n", error->message);
g_clear_error (&error);
}
}
static void
gimp_metadata_init (GimpMetadata *metadata)
{
}
/**
* gimp_metadata_get_guid:
*
* Generate Version 4 UUID/GUID.
*
* Returns: The new GUID/UUID string.
*
* Since: 2.10
*/
gchar *
gimp_metadata_get_guid (void)
{
GRand *rand;
gint bake;
gchar *GUID;
const gchar *szHex = "0123456789abcdef-";
rand = g_rand_new ();
#define DALLOC 36
GUID = g_malloc0 (DALLOC + 1);
for (bake = 0; bake < DALLOC; bake++)
{
gint r = g_rand_int (rand) % 16;
gchar c = ' ';
switch (bake)
{
default:
c = szHex [r];
break;
case 19 :
c = szHex [(r & 0x03) | 0x08];
break;
case 8:
case 13:
case 18:
case 23:
c = '-';
break;
case 14:
c = '4';
break;
}
GUID[bake] = (bake < DALLOC) ? c : 0x00;
}
g_rand_free (rand);
return GUID;
}
/**
* gimp_metadata_add_history:
*
* Add XMP mm History data to file metadata.
*
* Since: 2.10
*/
void
gimp_metadata_add_xmp_history (GimpMetadata *metadata,
gchar *state_status)
{
time_t now;
struct tm *now_tm;
gchar *tmp;
char timestr[256];
char tzstr[7];
gchar strdata[1024];
gchar tagstr[1024];
gchar *uuid;
gchar *str;
gchar *did;
gchar *odid;
GError *error = NULL;
gint id_count;
gint found;
gint lastfound;
gint count;
int ii;
static const gchar *tags[] =
{
"Xmp.xmpMM.InstanceID",
"Xmp.xmpMM.DocumentID",
"Xmp.xmpMM.OriginalDocumentID",
"Xmp.xmpMM.History"
};
static const gchar *history_tags[] =
{
"/stEvt:action",
"/stEvt:instanceID",
"/stEvt:when",
"/stEvt:softwareAgent",
"/stEvt:changed"
};
g_return_if_fail (GIMP_IS_METADATA (metadata));
/* Update new Instance ID */
uuid = gimp_metadata_get_guid ();
str = g_strconcat ("xmp.iid:", uuid, NULL);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tags[0], str, NULL);
g_free (uuid);
g_free (str);
/* Update new Document ID if none found */
did = gexiv2_metadata_try_get_tag_interpreted_string (GEXIV2_METADATA (metadata),
tags[1], NULL);
if (! did || ! strlen (did))
{
gchar *did_data;
gchar *uuid = gimp_metadata_get_guid ();
did_data = g_strconcat ("gimp:docid:gimp:", uuid, NULL);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tags[1], did_data, NULL);
g_free (uuid);
g_free (did_data);
}
/* Update new Original Document ID if none found */
odid = gexiv2_metadata_try_get_tag_interpreted_string (GEXIV2_METADATA (metadata),
tags[2], NULL);
if (! odid || ! strlen (odid))
{
gchar *did_data;
gchar *uuid = gimp_metadata_get_guid ();
did_data = g_strconcat ("xmp.did:", uuid, NULL);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tags[2], did_data, NULL);
g_free (uuid);
g_free (did_data);
}
/* Handle Xmp.xmpMM.History */
gexiv2_metadata_try_set_xmp_tag_struct (GEXIV2_METADATA (metadata),
tags[3],
GEXIV2_STRUCTURE_XA_SEQ,
NULL);
/* Find current number of entries for Xmp.xmpMM.History */
found = 0;
for (count = 1; count < 65536; count++)
{
lastfound = 0;
for (ii = 0; ii < 5; ii++)
{
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], count, history_tags[ii]);
if (gexiv2_metadata_try_has_tag (GEXIV2_METADATA (metadata),
tagstr, NULL))
{
lastfound = 1;
}
}
if (lastfound == 0)
break;
found++;
}
id_count = found + 1;
memset (tagstr, 0, sizeof (tagstr));
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], id_count, history_tags[0]);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tagstr, "saved", &error);
if (error)
{
g_printerr ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tagstr, error->message);
g_clear_error (&error);
}
memset (tagstr, 0, sizeof (tagstr));
memset (strdata, 0, sizeof (strdata));
uuid = gimp_metadata_get_guid ();
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], id_count, history_tags[1]);
g_snprintf (strdata, sizeof (strdata), "xmp.iid:%s",
uuid);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tagstr, strdata, &error);
if (error)
{
g_printerr ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tagstr, error->message);
g_clear_error (&error);
}
g_free(uuid);
memset (tagstr, 0, sizeof (tagstr));
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], id_count, history_tags[2]);
/* get local time */
time (&now);
now_tm = localtime (&now);
/* get timezone and fix format */
strftime (tzstr, 7, "%z", now_tm);
tzstr[6] = '\0';
tzstr[5] = tzstr[4];
tzstr[4] = tzstr[3];
tzstr[3] = ':';
/* get current time and timezone string */
strftime (timestr, 256, "%Y-%m-%dT%H:%M:%S", now_tm);
tmp = g_strdup_printf ("%s%s", timestr, tzstr);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tagstr, tmp, &error);
if (error)
{
g_printerr ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tagstr, error->message);
g_clear_error (&error);
}
g_free (tmp);
memset (tagstr, 0, sizeof (tagstr));
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], id_count, history_tags[3]);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tagstr,
PACKAGE_STRING " "
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
"(Windows)",
#elif defined(__linux__)
"(Linux)",
#elif defined(__APPLE__) && defined(__MACH__)
"(Mac OS)",
#elif defined(unix) || defined(__unix__) || defined(__unix)
"(Unix)",
#else
"(Unknown)",
#endif
&error);
if (error)
{
g_printerr ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tagstr, error->message);
g_clear_error (&error);
}
memset (tagstr, 0, sizeof (tagstr));
g_snprintf (tagstr, sizeof (tagstr), "%s[%d]%s",
tags[3], id_count, history_tags[4]);
str = g_strconcat ("/", state_status, NULL);
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
tagstr, str, &error);
g_free (str);
if (error)
{
g_printerr ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tagstr, error->message);
g_clear_error (&error);
}
}
/**
* gimp_metadata_new:
*
* Creates a new #GimpMetadata instance.
*
* Returns: (transfer full): The new #GimpMetadata.
*
* Since: 2.10
*/
GimpMetadata *
gimp_metadata_new (void)
{
GimpMetadata *metadata = NULL;
if (gexiv2_initialize ())
{
metadata = g_object_new (GIMP_TYPE_METADATA, NULL);
if (! gexiv2_metadata_open_buf (GEXIV2_METADATA (metadata),
wilber_jpg, wilber_jpg_len,
NULL))
{
g_object_unref (metadata);
return NULL;
}
}
return metadata;
}
/**
* gimp_metadata_duplicate:
* @metadata: The object to duplicate, or %NULL.
*
* Duplicates a #GimpMetadata instance.
*
* Returns: (transfer full):
* The new #GimpMetadata, or %NULL if @metadata is %NULL.
*
* Since: 2.10
*/
GimpMetadata *
gimp_metadata_duplicate (GimpMetadata *metadata)
{
GimpMetadata *new_metadata = NULL;
g_return_val_if_fail (metadata == NULL || GIMP_IS_METADATA (metadata), NULL);
if (metadata)
{
gchar *xml;
xml = gimp_metadata_serialize (metadata);
new_metadata = gimp_metadata_deserialize (xml);
g_free (xml);
}
return new_metadata;
}
typedef struct
{
gchar name[1024];
gchar prefix[256];
gboolean base64;
gboolean excessive_message_shown;
GimpMetadata *metadata;
} GimpMetadataParseData;
static const gchar*
gimp_metadata_attribute_name_to_value (const gchar **attribute_names,
const gchar **attribute_values,
const gchar *name)
{
while (*attribute_names)
{
if (! strcmp (*attribute_names, name))
{
return *attribute_values;
}
attribute_names++;
attribute_values++;
}
return NULL;
}
static void
gimp_metadata_deserialize_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
GimpMetadataParseData *parse_data = user_data;
if (! strcmp (element_name, "tag"))
{
const gchar *name;
const gchar *encoding;
name = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"name");
encoding = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"encoding");
if (! name)
{
g_set_error (error, GIMP_METADATA_ERROR, 1001,
"Element 'tag' does not contain required attribute 'name'.");
return;
}
g_strlcpy (parse_data->name, name, sizeof (parse_data->name));
parse_data->base64 = (encoding && ! strcmp (encoding, "base64"));
}
else if (! strcmp (element_name, "namespace"))
{
const gchar *url;
const gchar *prefix;
prefix = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"prefix");
url = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"url");
if (! prefix)
{
g_set_error (error, GIMP_METADATA_ERROR, 1002,
"Element 'namespace' does not contain required attribute 'prefix'.");
return;
}
if (! url)
{
g_set_error (error, GIMP_METADATA_ERROR, 1003,
"Element 'namespace' does not contain required attribute 'url'.");
return;
}
g_strlcpy (parse_data->prefix, prefix, sizeof (parse_data->prefix));
g_strlcpy (parse_data->name, url, sizeof (parse_data->name));
}
}
static void
gimp_metadata_deserialize_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
}
static void
gimp_metadata_deserialize_text (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
GimpMetadataParseData *parse_data = user_data;
const gchar *current_element;
current_element = g_markup_parse_context_get_element (context);
if (! g_strcmp0 (current_element, "tag"))
{
gchar *value = g_strndup (text, text_len);
if (parse_data->base64)
{
guchar *decoded;
gsize len;
decoded = g_base64_decode (value, &len);
if (decoded[len - 1] == '\0')
{
g_free (value);
value = (gchar *) decoded;
}
else
{
g_clear_pointer (&value, g_free);
g_clear_pointer (&decoded, g_free);
}
}
if (value)
{
GExiv2Metadata *g2_metadata = GEXIV2_METADATA (parse_data->metadata);
GError *error = NULL;
gchar **values;
values = gexiv2_metadata_try_get_tag_multiple (g2_metadata,
parse_data->name,
&error);
if (error)
{
g_printerr ("%s: %s\n", G_STRFUNC, error->message);
g_clear_error (&error);
g_strfreev (values);
}
else if (values)
{
guint length = g_strv_length (values);
if (length > 1000 &&
! g_strcmp0 (parse_data->name, "Xmp.photoshop.DocumentAncestors"))
{
/* Issue #8025, see also #7464 Some XCF images can have huge
* amounts of this tag, apparently due to a bug in PhotoShop.
* This makes deserializing it in the way we currently do
* too slow. Until we can change this let's ignore everything
* but the first 1000 values when serializing. */
if (! parse_data->excessive_message_shown)
{
g_message ("Excessive number of Xmp.photoshop.DocumentAncestors tags found. "
"Only keeping the first 1000 values.");
parse_data->excessive_message_shown = TRUE;
}
}
else
{
values = g_renew (gchar *, values, length + 2);
values[length] = g_strdup (value);
values[length + 1] = NULL;
gexiv2_metadata_try_set_tag_multiple (g2_metadata,
parse_data->name,
(const gchar **) values,
&error);
if (error)
{
g_warning ("%s: failed to set multiple metadata '%s': %s\n",
G_STRFUNC, parse_data->name, error->message);
g_clear_error (&error);
}
}
g_strfreev (values);
}
else
{
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (g2_metadata),
parse_data->name,
value, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, parse_data->name, error->message);
g_clear_error (&error);
}
}
g_free (value);
}
}
else if (! g_strcmp0 (current_element, "namespace"))
{
GError *error = NULL;
gexiv2_metadata_try_register_xmp_namespace (parse_data->name,
parse_data->prefix,
&error);
if (error) {
g_warning ("%s: failed to register namespace %s (url: '%s'): %s\n",
G_STRFUNC, parse_data->prefix, parse_data->name,
error->message);
g_clear_error(&error);
}
}
}
static void
gimp_metadata_deserialize_error (GMarkupParseContext *context,
GError *error,
gpointer user_data)
{
g_printerr ("Metadata parse error: %s\n", error->message);
}
/**
* gimp_metadata_deserialize:
* @metadata_xml: A string of serialized metadata XML.
*
* Deserializes a string of XML that has been created by
* gimp_metadata_serialize().
*
* Returns: (transfer full): The new #GimpMetadata.
*
* Since: 2.10
*/
GimpMetadata *
gimp_metadata_deserialize (const gchar *metadata_xml)
{
GimpMetadata *metadata;
GMarkupParser markup_parser;
GimpMetadataParseData parse_data;
GMarkupParseContext *context;
g_return_val_if_fail (metadata_xml != NULL, NULL);
metadata = gimp_metadata_new ();
parse_data.metadata = metadata;
parse_data.excessive_message_shown = FALSE;
markup_parser.start_element = gimp_metadata_deserialize_start_element;
markup_parser.end_element = gimp_metadata_deserialize_end_element;
markup_parser.text = gimp_metadata_deserialize_text;
markup_parser.passthrough = NULL;
markup_parser.error = gimp_metadata_deserialize_error;
context = g_markup_parse_context_new (&markup_parser, 0, &parse_data, NULL);
g_markup_parse_context_parse (context,
metadata_xml, strlen (metadata_xml),
NULL);
g_markup_parse_context_unref (context);
return metadata;
}
static gchar *
gimp_metadata_escape (const gchar *name,
const gchar *value,
gboolean *base64)
{
if (! g_utf8_validate (value, -1, NULL))
{
gchar *encoded;
encoded = g_base64_encode ((const guchar *) value, strlen (value) + 1);
g_printerr ("Invalid UTF-8 in metadata value %s, encoding as base64: %s\n",
name, encoded);
*base64 = TRUE;
return encoded;
}
*base64 = FALSE;
return g_markup_escape_text (value, -1);
}
static void
gimp_metadata_append_tag (GString *string,
const gchar *name,
gchar *value,
gboolean base64)
{
if (value)
{
if (base64)
{
g_string_append_printf (string, " <tag name=\"%s\" encoding=\"base64\">%s</tag>\n",
name, value);
}
else
{
g_string_append_printf (string, " <tag name=\"%s\">%s</tag>\n",
name, value);
}
g_free (value);
}
}
static void
gimp_metadata_add_namespace (GHashTable *namespaces,
GString *xml,
gchar *prefix)
{
if (! g_hash_table_lookup (namespaces, prefix))
{
gchar *namespace_url;
GError *error = NULL;
namespace_url = gexiv2_metadata_try_get_xmp_namespace_for_tag (prefix, &error);
if (! namespace_url)
{
/* Weird, we didn't find the namespace url.
Let's add a dummy url, that way we can keep the tags. */
if (error)
{
g_warning ("XMP namespace url not found! %s", error->message);
g_clear_error (&error);
}
/* Fix the one namespace url we know of, and add a generic fix for
any others. */
if (g_strcmp0 (prefix, "Item") == 0)
/* FIXME Remove this specific check for Item after this is fixed
in our dependencies (exiv2?), see issue #10557. */
namespace_url = g_strdup ("http://ns.google.com/photos/1.0/container/item/");
else
namespace_url = g_strdup_printf ("http://missing-url.org/%s/", prefix);
if (! gexiv2_metadata_try_register_xmp_namespace (namespace_url,
prefix, &error))
{
g_warning ("Registering XMP namespace failed! %s\n", error->message);
g_clear_error (&error);
}
}
if (namespace_url)
{
g_debug ("Adding namespace %s, url: %s", prefix, namespace_url);
if (! g_hash_table_insert (namespaces, prefix, namespace_url))
g_warning ("Namespace already present: %s!", prefix);
g_string_append_printf (xml,
" <namespace prefix=\"%s\" url=\"%s\"></namespace>\n",
prefix, namespace_url);
/* namespace_url and prefix are added to hashtable, so we don't free here */
}
else
{
g_free (prefix);
}
}
else
{
g_free (prefix);
}
}
/* Register a namespace in our xml metadata for each XMP namespace.
* We use the following XML format:
* <namespace prefix="namespace-prefix" url="namespace-url"></namespace>
*
* There are two types of namespace prefixes:
* - Xmp.prefix.whatever, and
* - /prefix:something, which is prefixed by the above
*
* We use a hashtable to keep track of which namespaces we have already
* seen in the current run.
*/
static void
gimp_metadata_add_xmp_namespaces (GHashTable *namespaces,
GString *xml,
const gchar *tag)
{
gchar *tag_ptr = (gchar *) tag;
gchar *prefix;
gchar **substrings;
/* Find word between the first and second '.' */
substrings = g_strsplit ((gchar *) tag_ptr, ".", 3);
if (substrings && substrings[1])
{
prefix = g_strdup (substrings[1]);
gimp_metadata_add_namespace (namespaces, xml, prefix);
}
g_strfreev (substrings);
/* Multiple namespaces in the form /prefix:value are possible in one tag. */
while (tag_ptr)
{
gchar *tag_next = NULL;
tag_ptr = strstr (tag_ptr, "/");
if (! tag_ptr || strlen (tag_ptr) <= 1)
break;
tag_ptr++;
tag_next = strstr (tag_ptr, ":");
if (tag_next)
{
gsize prefix_len = (gsize) tag_next - (gsize) tag_ptr + 1;
prefix = g_new (gchar, prefix_len);
g_strlcpy (prefix, tag_ptr, prefix_len);
gimp_metadata_add_namespace (namespaces, xml, prefix);
tag_ptr = tag_next;