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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.
*/
namespace Photos {
public class TiffFileFormatDriver : PhotoFileFormatDriver {
private static TiffFileFormatDriver instance = null;
public static void init() {
instance = new TiffFileFormatDriver();
TiffFileFormatProperties.init();
}
public static TiffFileFormatDriver get_instance() {
return instance;
}
public override PhotoFileFormatProperties get_properties() {
return TiffFileFormatProperties.get_instance();
}
public override PhotoFileReader create_reader(string filepath) {
return new TiffReader(filepath);
}
public override PhotoMetadata create_metadata() {
return new PhotoMetadata();
}
public override bool can_write_image() {
return true;
}
public override bool can_write_metadata() {
return true;
}
public override PhotoFileWriter? create_writer(string filepath) {
return new TiffWriter(filepath);
}
public override PhotoFileMetadataWriter? create_metadata_writer(string filepath) {
return new TiffMetadataWriter(filepath);
}
public override PhotoFileSniffer create_sniffer(File file, PhotoFileSniffer.Options options) {
return new TiffSniffer(file, options);
}
}
private class TiffFileFormatProperties : PhotoFileFormatProperties {
private static string[] KNOWN_EXTENSIONS = {
"tif", "tiff"
};
private static string[] KNOWN_MIME_TYPES = {
"image/tiff"
};
private static TiffFileFormatProperties instance = null;
public static void init() {
instance = new TiffFileFormatProperties();
}
public static TiffFileFormatProperties get_instance() {
return instance;
}
public override PhotoFileFormat get_file_format() {
return PhotoFileFormat.TIFF;
}
public override PhotoFileFormatFlags get_flags() {
return PhotoFileFormatFlags.NONE;
}
public override string get_default_extension() {
return "tif";
}
public override string get_user_visible_name() {
return _("TIFF");
}
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;
}
}
private class TiffSniffer : GdkSniffer {
public TiffSniffer(File file, PhotoFileSniffer.Options options) {
base (file, options);
}
public override DetectedPhotoInformation? sniff(out bool is_corrupted) throws Error {
// Rely on GdkSniffer to detect corruption
is_corrupted = false;
if (!is_tiff(file))
return null;
DetectedPhotoInformation? detected = base.sniff(out is_corrupted);
if (detected == null)
return null;
return (detected.file_format == PhotoFileFormat.TIFF) ? detected : null;
}
}
private class TiffReader : GdkReader {
public TiffReader(string filepath) {
base (filepath, PhotoFileFormat.TIFF);
}
}
private class TiffWriter : PhotoFileWriter {
private const string COMPRESSION_NONE = "1";
private const string COMPRESSION_HUFFMAN = "2";
private const string COMPRESSION_LZW = "5";
private const string COMPRESSION_JPEG = "7";
private const string COMPRESSION_DEFLATE = "8";
public TiffWriter(string filepath) {
base (filepath, PhotoFileFormat.TIFF);
}
public override void write(Gdk.Pixbuf pixbuf, Jpeg.Quality quality) throws Error {
pixbuf.save(get_filepath(), "tiff", "compression", COMPRESSION_LZW);
}
}
private class TiffMetadataWriter : PhotoFileMetadataWriter {
public TiffMetadataWriter(string filepath) {
base (filepath, PhotoFileFormat.TIFF);
}
public override void write_metadata(PhotoMetadata metadata) throws Error {
metadata.write_to_file(get_file());
}
}
public bool is_tiff(File file, Cancellable? cancellable = null) throws Error {
DataInputStream dins = new DataInputStream(file.read());
// first two bytes: "II" (0x4949, for Intel) or "MM" (0x4D4D, for Motorola)
DataStreamByteOrder order;
switch (dins.read_uint16(cancellable)) {
case 0x4949:
order = DataStreamByteOrder.LITTLE_ENDIAN;
break;
case 0x4D4D:
order = DataStreamByteOrder.BIG_ENDIAN;
break;
default:
return false;
}
dins.set_byte_order(order);
// second two bytes: some random number
uint16 lue = dins.read_uint16(cancellable);
if (lue != 42)
return false;
// remaining bytes are offset of first IFD, which doesn't matter for our purposes
return true;
}
}
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