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/* Copyright 2016 Software Freedom Conservancy Inc.
*
* This software is licensed under the GNU LGPL (version 2.1 or later).
* See the COPYING file in this distribution.
*/
class JpegXLFileFormatProperties : PhotoFileFormatProperties {
private static string[] KNOWN_EXTENSIONS = { "jxl", "jpegxl" };
private static string[] KNOWN_MIME_TYPES = { "image/jxl" };
private static JpegXLFileFormatProperties instance = null;
public static void init() {
instance = new JpegXLFileFormatProperties();
}
public static JpegXLFileFormatProperties get_instance() {
return instance;
}
public override PhotoFileFormat get_file_format() {
return PhotoFileFormat.JPEGXL;
}
public override PhotoFileFormatFlags get_flags() {
return PhotoFileFormatFlags.NONE;
}
public override string get_user_visible_name() {
return _("JPEGXL");
}
public override string get_default_extension() {
return KNOWN_EXTENSIONS[0];
}
public override string[] get_known_extensions() {
return KNOWN_EXTENSIONS;
}
public override string get_default_mime_type() {
return KNOWN_MIME_TYPES[0];
}
public override string[] get_mime_types() {
return KNOWN_MIME_TYPES;
}
}
public class JpegXLSniffer : GdkSniffer {
// See https://github.com/ImageMagick/jpeg-xl/blob/main/doc/format_overview.md#file-format
private const uint8[] CODESTREAM_MAGIC_SEQUENCE = { 0xff, 0x0a };
private const uint8[] BMFF_MAGIC_SEQUENCE = {0x00, 0x00, 0x00, 0x0C, 0x4A, 0x58, 0x4C, 0x20, 0x0D, 0x0A, 0x87, 0x0A};
public JpegXLSniffer(File file, PhotoFileSniffer.Options options) {
base (file, options);
}
private static bool is_jpegxl_file(File file) throws Error {
FileInputStream instream = file.read(null);
// Read out first four bytes
uint8[] file_lead_sequence = new uint8[BMFF_MAGIC_SEQUENCE.length];
var size = instream.read(file_lead_sequence, null);
return size == BMFF_MAGIC_SEQUENCE.length && (Memory.cmp(CODESTREAM_MAGIC_SEQUENCE, file_lead_sequence, CODESTREAM_MAGIC_SEQUENCE.length) == 0 ||
Memory.cmp(BMFF_MAGIC_SEQUENCE, file_lead_sequence, BMFF_MAGIC_SEQUENCE.length) == 0);
}
public override DetectedPhotoInformation? sniff(out bool is_corrupted) throws Error {
// Rely on GdkSniffer to detect corruption
is_corrupted = false;
if (!is_jpegxl_file(file))
return null;
DetectedPhotoInformation? detected = base.sniff(out is_corrupted);
if (detected == null)
return null;
return (detected.file_format == PhotoFileFormat.JPEGXL) ? detected : null;
}
}
public class JpegXLReader : GdkReader {
public JpegXLReader(string filepath) {
base (filepath, PhotoFileFormat.JPEGXL);
}
}
public class JpegXLMetadataWriter : PhotoFileMetadataWriter {
public JpegXLMetadataWriter(string filepath) {
base (filepath, PhotoFileFormat.JPEGXL);
}
public override void write_metadata(PhotoMetadata metadata) throws Error {
metadata.write_to_file(get_file());
}
}
public class JpegXLFileFormatDriver : PhotoFileFormatDriver {
private static JpegXLFileFormatDriver instance = null;
public static void init() {
instance = new JpegXLFileFormatDriver();
JpegXLFileFormatProperties.init();
}
public static JpegXLFileFormatDriver get_instance() {
return instance;
}
public override PhotoFileFormatProperties get_properties() {
return JpegXLFileFormatProperties.get_instance();
}
public override PhotoFileReader create_reader(string filepath) {
return new JpegXLReader(filepath);
}
public override bool can_write_image() {
return false;
}
public override bool can_write_metadata() {
return true;
}
public override PhotoFileWriter? create_writer(string filepath) {
return null;
}
public override PhotoFileMetadataWriter? create_metadata_writer(string filepath) {
return new JpegXLMetadataWriter(filepath);
}
public override PhotoFileSniffer create_sniffer(File file, PhotoFileSniffer.Options options) {
return new JpegXLSniffer(file, options);
}
public override PhotoMetadata create_metadata() {
return new PhotoMetadata();
}
}
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