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authorJörg Frings-Fürst <debian@jff.email>2023-06-28 21:35:52 +0200
committerJörg Frings-Fürst <debian@jff.email>2023-06-28 21:35:52 +0200
commitb86540b743f1a87a163ffb811c8fe22a01fefa38 (patch)
treeb47cb3bb83c2377234226fb3987ab3320a987dd9 /src/photos/WebPSupport.vala
parentac6e0b731b9f0b2efd392e3309a5c07e2a66adad (diff)
parente905d8e16eec152d19797937f13ba3cf4b8f8aca (diff)
Merge branch 'release/debian/0.32.1-1'debian/0.32.1-1
Diffstat (limited to 'src/photos/WebPSupport.vala')
-rw-r--r--src/photos/WebPSupport.vala240
1 files changed, 240 insertions, 0 deletions
diff --git a/src/photos/WebPSupport.vala b/src/photos/WebPSupport.vala
new file mode 100644
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+++ b/src/photos/WebPSupport.vala
@@ -0,0 +1,240 @@
+/* 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 WebpFileFormatDriver : PhotoFileFormatDriver {
+ private static WebpFileFormatDriver instance = null;
+
+ public static void init() {
+ instance = new WebpFileFormatDriver();
+ WebpFileFormatProperties.init();
+ }
+
+ public static WebpFileFormatDriver get_instance() {
+ return instance;
+ }
+
+ public override PhotoFileFormatProperties get_properties() {
+ return WebpFileFormatProperties.get_instance();
+ }
+
+ public override PhotoFileReader create_reader(string filepath) {
+ return new WebpReader(filepath);
+ }
+
+ public override PhotoMetadata create_metadata() {
+ return new PhotoMetadata();
+ }
+
+ 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 WebpMetadataWriter(filepath);
+ }
+
+ public override PhotoFileSniffer create_sniffer(File file, PhotoFileSniffer.Options options) {
+ return new WebpSniffer(file, options);
+ }
+}
+
+private class WebpFileFormatProperties : PhotoFileFormatProperties {
+ private static string[] KNOWN_EXTENSIONS = {
+ "webp"
+ };
+
+ private static string[] KNOWN_MIME_TYPES = {
+ "image/webp"
+ };
+
+ private static WebpFileFormatProperties instance = null;
+
+ public static void init() {
+ instance = new WebpFileFormatProperties();
+ }
+
+ public static WebpFileFormatProperties get_instance() {
+ return instance;
+ }
+
+ public override PhotoFileFormat get_file_format() {
+ return PhotoFileFormat.WEBP;
+ }
+
+ public override PhotoFileFormatFlags get_flags() {
+ return PhotoFileFormatFlags.NONE;
+ }
+
+ public override string get_default_extension() {
+ return "webp";
+ }
+
+ public override string get_user_visible_name() {
+ return _("WebP");
+ }
+
+ 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 WebpSniffer : PhotoFileSniffer {
+ private DetectedPhotoInformation detected = null;
+
+ public WebpSniffer(File file, PhotoFileSniffer.Options options) {
+ base (file, options);
+ detected = new DetectedPhotoInformation();
+ }
+
+ public override DetectedPhotoInformation? sniff(out bool is_corrupted) throws Error {
+ is_corrupted = false;
+
+ if (!is_webp(file))
+ return null;
+
+ // valac chokes on the ternary operator here
+ Checksum? md5_checksum = null;
+ if (calc_md5)
+ md5_checksum = new Checksum(ChecksumType.MD5);
+
+ detected.metadata = new PhotoMetadata();
+ try {
+ detected.metadata.read_from_file(file);
+ } catch (Error err) {
+ debug("Failed to load meta-data from file: %s", err.message);
+ // no metadata detected
+ detected.metadata = null;
+ }
+
+ if (calc_md5 && detected.metadata != null) {
+ detected.exif_md5 = detected.metadata.exif_hash();
+ detected.thumbnail_md5 = detected.metadata.thumbnail_hash();
+ }
+
+ // if no MD5, don't read as much, as the needed info will probably be gleaned
+ // in the first 8K to 16K
+ uint8[] buffer = calc_md5 ? new uint8[64 * 1024] : new uint8[8 * 1024];
+ size_t count = 0;
+
+ // loop through until all conditions we're searching for are met
+ FileInputStream fins = file.read(null);
+ var ba = new ByteArray();
+ for (;;) {
+ size_t bytes_read = fins.read(buffer, null);
+ if (bytes_read <= 0)
+ break;
+
+ ba.append(buffer[0:bytes_read]);
+
+ count += bytes_read;
+
+ if (calc_md5)
+ md5_checksum.update(buffer, bytes_read);
+
+ WebP.Data d = WebP.Data();
+ d.bytes = ba.data;
+
+ WebP.ParsingState state;
+ var demux = new WebP.Demuxer.partial(d, out state);
+
+ if (state == WebP.ParsingState.PARSE_ERROR) {
+ is_corrupted = true;
+ break;
+ }
+
+ if (state > WebP.ParsingState.PARSED_HEADER) {
+ detected.file_format = PhotoFileFormat.WEBP;
+ detected.format_name = "WebP";
+ detected.channels = 4;
+ detected.bits_per_channel = 8;
+ detected.image_dim.width = (int) demux.get(WebP.FormatFeature.CANVAS_WIDTH);
+ detected.image_dim.height = (int) demux.get(WebP.FormatFeature.CANVAS_HEIGHT);
+
+ // if not searching for anything else, exit
+ if (!calc_md5)
+ break;
+ }
+ }
+
+ if (fins != null)
+ fins.close(null);
+
+ if (calc_md5)
+ detected.md5 = md5_checksum.get_string();
+
+ return detected;
+ }
+}
+
+private class WebpReader : PhotoFileReader {
+ public WebpReader(string filepath) {
+ base (filepath, PhotoFileFormat.WEBP);
+ }
+
+ public override PhotoMetadata read_metadata() throws Error {
+ PhotoMetadata metadata = new PhotoMetadata();
+ metadata.read_from_file(get_file());
+
+ return metadata;
+ }
+
+ public override Gdk.Pixbuf unscaled_read() throws Error {
+ uint8[] buffer;
+
+ FileUtils.get_data(this.get_filepath(), out buffer);
+ int width, height;
+ var pixdata = WebP.DecodeRGBA(buffer, out width, out height);
+ pixdata.length = width * height * 4;
+
+ return new Gdk.Pixbuf.from_data(pixdata, Gdk.Colorspace.RGB, true, 8, width, height, width * 4);
+ }
+}
+
+private class WebpMetadataWriter : PhotoFileMetadataWriter {
+ public WebpMetadataWriter(string filepath) {
+ base (filepath, PhotoFileFormat.WEBP);
+ }
+
+ public override void write_metadata(PhotoMetadata metadata) throws Error {
+ metadata.write_to_file(get_file());
+ }
+}
+
+public bool is_webp(File file, Cancellable? cancellable = null) throws Error {
+ var ins = file.read();
+
+ uint8 buffer[12];
+ try {
+ ins.read(buffer, null);
+ if (buffer[0] == 'R' && buffer[1] == 'I' && buffer[2] == 'F' && buffer[3] == 'F' &&
+ buffer[8] == 'W' && buffer[9] == 'E' && buffer[10] == 'B' && buffer[11] == 'P')
+ return true;
+ } catch (Error error) {
+ debug ("Failed to read from file %s: %s", file.get_path (), error.message);
+ }
+
+ return false;
+}
+
+}