Push ImageInputStream into DDSReader

Unable to determine buffer length (so as a hack I over allocate buffer and read)

```
byte[] buffer = new byte[width * height * 4];
int len = imageInput.read(buffer);
```

Added test files for all supported formats.

imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSHeader.java

@@ -25,66 +25,61 @@ public final class DDSHeader {
 	public static DDSHeader read(final ImageInputStream imageInput) throws IOException {
 		DDSHeader header = new DDSHeader();
 
-		imageInput.mark();
+		imageInput.setByteOrder(ByteOrder.LITTLE_ENDIAN);
 
-		try {
-			imageInput.setByteOrder(ByteOrder.LITTLE_ENDIAN);
-
-			// Read MAGIC bytes [0,3]
-			byte[] magic = new byte[DDS.MAGIC.length];
-			imageInput.readFully(magic);
-			if (!Arrays.equals(DDS.MAGIC, magic)) {
-				throw new IIOException("Unsupported MAGIC bytes.");
-			}
-
-			// DDS_HEADER structure
-			// https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dds-header
-			int dwSize = imageInput.readInt(); // [4,7]
-			if (dwSize != DDS.HEADER_SIZE) {
-				throw new IIOException("Invalid header size: " + dwSize);
-			}
-
-			// Verify flags
-			header.flags = imageInput.readInt(); // [8,11]
-			if (header.getFlag(DDS.FLAG_CAPS
-					& DDS.FLAG_HEIGHT
-					& DDS.FLAG_WIDTH
-					& DDS.FLAG_PIXELFORMAT)) {
-				throw new IIOException("Required DDS Flag missing in header: " + Integer.toHexString(header.flags));
-			}
-
-			// Read Height & Width
-			header.height = imageInput.readInt(); // [12,15]
-			header.width = imageInput.readInt();  // [16,19]
-
-
-			int dwPitchOrLinearSize = imageInput.readInt(); // [20,23]
-			int dwDepth = imageInput.readInt(); // [24,27]
-			header.mipmap = imageInput.readInt(); // [28,31]
-
-			byte[] dwReserved1 = new byte[11 * 4];  // [32,75]
-			imageInput.readFully(dwReserved1);
-
-			// DDS_PIXELFORMAT structure
-			int px_dwSize = imageInput.readInt(); // [76,79]
-
-			header.pixelFormatFlags = imageInput.readInt(); // [80,83]
-			header.fourCC = imageInput.readInt(); // [84,87]
-			header.bitCount = imageInput.readInt(); // [88,91]
-			header.redMask = imageInput.readInt(); // [92,95]
-			header.greenMask = imageInput.readInt(); // [96,99]
-			header.blueMask = imageInput.readInt(); // [100,103]
-			header.alphaMask = imageInput.readInt(); // [104,107]
-
-			int dwCaps = imageInput.readInt();
-			int dwCaps2 = imageInput.readInt();
-			int dwCaps3 = imageInput.readInt();
-			int dwCaps4 = imageInput.readInt();
-
-			int dwReserved2 = imageInput.readInt();
-		} finally {
-			imageInput.reset();
+		// Read MAGIC bytes [0,3]
+		byte[] magic = new byte[DDS.MAGIC.length];
+		imageInput.readFully(magic);
+		if (!Arrays.equals(DDS.MAGIC, magic)) {
+			throw new IIOException("Unsupported MAGIC bytes.");
 		}
+
+		// DDS_HEADER structure
+		// https://learn.microsoft.com/en-us/windows/win32/direct3ddds/dds-header
+		int dwSize = imageInput.readInt(); // [4,7]
+		if (dwSize != DDS.HEADER_SIZE) {
+			throw new IIOException("Invalid header size: " + dwSize);
+		}
+
+		// Verify flags
+		header.flags = imageInput.readInt(); // [8,11]
+		if (header.getFlag(DDS.FLAG_CAPS
+				& DDS.FLAG_HEIGHT
+				& DDS.FLAG_WIDTH
+				& DDS.FLAG_PIXELFORMAT)) {
+			throw new IIOException("Required DDS Flag missing in header: " + Integer.toHexString(header.flags));
+		}
+
+		// Read Height & Width
+		header.height = imageInput.readInt(); // [12,15]
+		header.width = imageInput.readInt();  // [16,19]
+
+
+		int dwPitchOrLinearSize = imageInput.readInt(); // [20,23]
+		int dwDepth = imageInput.readInt(); // [24,27]
+		header.mipmap = imageInput.readInt(); // [28,31]
+
+		byte[] dwReserved1 = new byte[11 * 4];  // [32,75]
+		imageInput.readFully(dwReserved1);
+
+		// DDS_PIXELFORMAT structure
+		int px_dwSize = imageInput.readInt(); // [76,79]
+
+		header.pixelFormatFlags = imageInput.readInt(); // [80,83]
+		header.fourCC = imageInput.readInt(); // [84,87]
+		header.bitCount = imageInput.readInt(); // [88,91]
+		header.redMask = imageInput.readInt(); // [92,95]
+		header.greenMask = imageInput.readInt(); // [96,99]
+		header.blueMask = imageInput.readInt(); // [100,103]
+		header.alphaMask = imageInput.readInt(); // [104,107]
+
+		int dwCaps = imageInput.readInt(); // [108,111]
+		int dwCaps2 = imageInput.readInt(); // [112,115]
+		int dwCaps3 = imageInput.readInt(); // [116,119]
+		int dwCaps4 = imageInput.readInt(); // [120,123]
+
+		int dwReserved2 = imageInput.readInt(); // [124,127]
+
 		return header;
 	}
 

imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSImageReader.java

@@ -10,8 +10,10 @@ import javax.imageio.spi.ImageReaderSpi;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Iterator;
+import java.util.List;
 
 public final class DDSImageReader extends ImageReaderBase {
 
@@ -68,12 +70,8 @@ public final class DDSImageReader extends ImageReaderBase {
 
 		BufferedImage destination = getDestination(param, getImageTypes(imageIndex), width, height);
 
-		// TODO
-		byte[] buffer = new byte[width * height * 4];
-		imageInput.read(buffer);
-
 		DDSReader dds = new DDSReader(header);
-		int[] pixels = dds.read(buffer, 0);
+		int[] pixels = dds.read(imageInput, 0);
 		destination.setRGB(0, 0, width, height, pixels, 0, width);
 
 		processImageComplete();
@@ -92,11 +90,45 @@ public final class DDSImageReader extends ImageReaderBase {
 	}
 
 	public static void main(final String[] args) throws IOException {
-		File file = new File("imageio/imageio-dds/src/test/resources/dds/stones.dxt5.dds");
-		//File file = new File("imageio/imageio-dds/src/test/resources/dds/dxt1-noalpha.dds");
 
-		BufferedImage image = ImageIO.read(file);
+		String parentDir = "imageio/imageio-dds/src/test/resources/dds";
+
+		List<File> testFiles = new ArrayList<>();
+		testFiles.add(new File(parentDir, "dds_A1R5G5B5.dds"));
+		testFiles.add(new File(parentDir, "dds_A1R5G5B5_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_A4R4G4B4.dds"));
+		testFiles.add(new File(parentDir, "dds_A4R4G4B4_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_A8B8G8R8.dds"));
+		testFiles.add(new File(parentDir, "dds_A8B8G8R8_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_A8R8G8B8.dds"));
+		testFiles.add(new File(parentDir, "dds_A8R8G8B8_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT1.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT1_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT2.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT2_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT3.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT3_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT4.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT4_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT5.dds"));
+		testFiles.add(new File(parentDir, "dds_DXT5_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_R5G6B5.dds"));
+		testFiles.add(new File(parentDir, "dds_R5G6B5_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_R8G8B8.dds"));
+		testFiles.add(new File(parentDir, "dds_R8G8B8_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_X1R5G5B5.dds"));
+		testFiles.add(new File(parentDir, "dds_X1R5G5B5_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_X4R4G4B4.dds"));
+		testFiles.add(new File(parentDir, "dds_X4R4G4B4_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_X8B8G8R8.dds"));
+		testFiles.add(new File(parentDir, "dds_X8B8G8R8_mipmap.dds"));
+		testFiles.add(new File(parentDir, "dds_X8R8G8B8.dds"));
+		testFiles.add(new File(parentDir, "dds_X8R8G8B8_mipmap.dds"));
+
+		for (File file : testFiles) {
+			BufferedImage image = ImageIO.read(file);
+			showIt(image, file.getName());
+		}
 
-		showIt(image, file.getName());
 	}
 }

imageio/imageio-dds/src/main/java/com/twelvemonkeys/imageio/plugins/dds/DDSReader.java

@@ -14,6 +14,9 @@
 
 package com.twelvemonkeys.imageio.plugins.dds;
 
+import javax.imageio.stream.ImageInputStream;
+import java.io.IOException;
+
 public final class DDSReader {
 
 	public static final Order order = new Order(16, 8, 0, 24);
@@ -25,19 +28,22 @@ public final class DDSReader {
 		this.header = header;
 	}
 
-	public int[] read(byte[] buffer, int mipmapLevel) {
+	public int[] read(ImageInputStream imageInput, int mipmapLevel) throws IOException {
 
 		// header
 		int width = header.getWidth();
 		int height = header.getHeight();
 		int mipmap = header.getMipmap();
 
+		byte[] buffer = new byte[width * height * 4];
+		int len = imageInput.read(buffer);
+
 		// type
 		int type = getType(header);
 		if (type == 0) return null;
 
 		// offset
-		int offset = 128; // header size
+		int offset = 0; // header size
 		if (mipmapLevel > 0 && mipmapLevel < mipmap) {
 			for (int i = 0; i < mipmapLevel; i++) {
 				switch (type) {