100 lines
2.1 KiB
Protocol Buffer
100 lines
2.1 KiB
Protocol Buffer
syntax = "proto2";
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// Proto description of the gif format.
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// Refer to: https://www.fileformat.info/format/gif/egff.htm
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// https://www.matthewflickinger.com/lab/whatsinagif/bits_and_bytes.asp
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// TODO: Verify if this is correct
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message LogicalScreenDescriptor {
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required uint32 ScreenWidth = 1;
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required uint32 ScreenHeight= 2;
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required uint32 Packed = 3;
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required uint32 BackgroundColor = 4;
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required uint32 AspectRatio = 5;
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}
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message GlobalColorTable {
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required bytes colors = 1;
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}
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message ImageDescriptor {
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required uint32 Seperator =1;
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required uint32 Left =2;
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required uint32 Top = 3;
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required uint32 Width = 4;
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required uint32 Height = 5;
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required uint32 Packed = 6;
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}
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message GraphicControlExtension {
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required uint32 Packed = 1;
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required uint32 DelayTime = 2;
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required uint32 transparentColorIndex = 3;
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}
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message PlainTextExtension {
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repeated SubBlock subs = 1;
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optional GraphicControlExtension gcExt = 2;
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}
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message LocalColorTable {
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required bytes colors = 1;
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}
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message SubBlock {
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required uint32 len = 1;
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required bytes data = 2;
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}
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message ImageData {
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required uint32 lzw = 1;
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repeated SubBlock subs = 2;
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}
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message BasicChunk {
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required ImageDescriptor imDescriptor =1;
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required LocalColorTable lct = 2;
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required ImageData img = 3;
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optional GraphicControlExtension gcExt = 4;
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}
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message ApplicationExtension {
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required fixed64 appid = 1;
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repeated SubBlock subs = 2;
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}
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message CommentExtension {
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repeated SubBlock subs = 1;
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}
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message Header {
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enum Version {
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ENA = 1;
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ESA = 2;
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INV = 3;
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}
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required Version ver = 1;
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}
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message Trailer {}
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message ImageChunk {
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oneof chunk_oneof {
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BasicChunk basic = 1;
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PlainTextExtension plaintext = 2;
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ApplicationExtension appExt = 3;
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CommentExtension comExt = 4;
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}
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}
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message GifProto {
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required Header header = 1;
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required LogicalScreenDescriptor lsd = 2;
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// Instead of making GCT optional here, we condition its visit on LSD's packed byte
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// in the converter
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required GlobalColorTable gct = 3;
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repeated ImageChunk chunks = 4;
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required Trailer trailer = 5;
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}
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package gifProtoFuzzer; |