1 files changed, 127 insertions, 0 deletions
diff --git a/graphics/ilbm.h b/graphics/ilbm.h
index c95dc3504b..7d1f06767b 100644
--- a/graphics/ilbm.h
+++ b/graphics/ilbm.h
@@ -26,6 +26,133 @@ namespace Graphics {
 
 void decodeILBM(Common::ReadStream &input, Surface &surface, byte *&colors);
 
+
+typedef uint32 IFF_ID;
+
+struct Chunk {
+	IFF_ID id;
+	uint32 size;
+	uint32 bytesRead;
+	Common::ReadStream *_input;
+
+	Chunk(Common::ReadStream *input): _input(input) {
+		size = bytesRead = 0;
+	}
+
+	void incBytesRead(uint32 inc) {
+		bytesRead += inc;
+		if (bytesRead > size) {
+			error("Chunk overead");
+		}
+	}
+
+	void readHeader() {
+		id = _input->readUint32BE();
+		size = _input->readUint32BE();
+		bytesRead = 0;
+	}
+
+	bool eos() {
+		return (size - bytesRead) == 0;
+	}
+
+	void feed() {
+		if (size % 2) {
+			size++;
+		}
+		while (!_input->eos() && !eos()) {
+			readByte();
+		}
+	}
+
+	byte readByte() {
+		incBytesRead(1);
+		return _input->readByte();
+	}
+
+	int8 readSByte() {
+		incBytesRead(1);
+		return _input->readSByte();
+	}
+
+	uint16 readUint16() {
+		incBytesRead(2);
+		return _input->readUint16BE();
+	}
+
+	uint32 readUint32() {
+		incBytesRead(4);
+		return _input->readUint32BE();
+	}
+
+	int16 readSint16() {
+		return (int16)readUint16();
+	}
+
+	int32 readSint32() {
+		return (int32)readUint32();
+	}
+};
+
+
+struct BMHD {
+	uint16 width, height;
+	uint16 x, y;
+	byte depth;
+	byte masking;
+	byte pack;
+	byte flags;
+	uint16 transparentColor;
+	byte xAspect, yAspect;
+	uint16 pageWidth, pageHeight;
+	BMHD() {
+		memset(this, 0, sizeof(*this));
+	}
+};
+
+
+
+class IFFDecoder {
+
+protected:
+	Chunk 	_formChunk;
+	Chunk 	_chunk;
+
+	IFF_ID 	_typeId;
+	BMHD 	_bitmapHeader;
+	uint32 	_colorCount;
+
+	Surface *_surface;
+	byte    *_colors;
+
+	virtual bool isTypeSupported(IFF_ID type) = 0;
+	virtual void readBODY() = 0;
+
+	virtual void readBMHD();
+	virtual void readCMAP();
+
+public:
+	IFFDecoder(Common::ReadStream &input);
+	virtual ~IFFDecoder();
+
+	virtual void decode(Surface &surface, byte *&colors);
+
+};
+
+
+
+class PBMDecoder : public IFFDecoder {
+
+protected:
+	bool isTypeSupported(IFF_ID type);
+	void readBody();
+
+public:
+	PBMDecoder(Common::ReadStream &input);
+	~PBMDecoder();
+
+};
+
 }	// End of namespace Graphics
 
 #endif