Add a simple BMP parser. (#11)

patterns/bmp.hexpat

@@ -0,0 +1,51 @@
+#pragma MIME image/bmp
+#pragma endian little
+
+struct BitmapFileHeader {
+	u8 bfType[2];
+	u32 bfSize;
+	u16 bfReserved1;
+	u16 bfReserved2;
+	u32 bfOffBits;
+};
+
+struct BitmapInfoHeader {
+	u32 biSize;
+	s32 biWidth;
+	s32 biHeight;
+	u16 biPlanes;
+	u16 biBitCount;
+	u32 biCompression;
+	u32 biSizeImage;
+	s32 biXPelsPerMeter;
+	s32 biYPelsPerMeter;
+	u32 biClrUsed;
+	u32 biClrImportant;
+};
+
+struct Colors {
+	u8 blue;
+	u8 green;
+	u8 red;
+	u8 reserved;
+};
+
+struct Bitmap {
+	BitmapFileHeader bmfh;
+	BitmapInfoHeader bmih;
+	
+	if ((bmih.biBitCount != 24) && (bmih.biBitCount != 32))
+	{
+		if (bmih.biClrUsed > 0 )
+			Colors rgbq[bmih.biClrUsed];
+		else
+			Colors rgbq[1 << bmih.biBitCount];
+	}
+	
+	if (bmih.biSizeImage > 0 )
+		u8 lineData[bmih.biSizeImage];
+	else
+		u8 lineData[bmfh.bfSize - $];
+};
+
+Bitmap bitmap @ 0x00;