How to use

LittleEndianDataInput

in

com.ardor3d.util

public final void readFully(final byte b[], final int off, final int len) throws IOException {
  // this may look over-complicated, but the problem is that the InputStream.read() methods are
  // not guaranteed to fill up the buffer you pass to it. So we need to loop until we have filled
  // up the buffer or until we reach the end of the file.
  final int bytesRead = _stream.read(b, off, len);
  if (bytesRead == -1) {
    throw new EOFException("EOF reached");
  }
  if (bytesRead < len) {
    // we didn't get all the data we wanted, so read some more
    readFully(b, off + bytesRead, len - bytesRead);
  }
}

  static DdsPixelFormat read(final LittleEndianDataInput in) throws IOException {
    final DdsPixelFormat format = new DdsPixelFormat();
    format.dwSize = in.readInt();
    if (format.dwSize != 32) {
      throw new Error("invalid pixel format size: " + format.dwSize);
    }
    format.dwFlags = in.readInt();
    format.dwFourCC = in.readInt();
    format.dwRGBBitCount = in.readInt();
    format.dwRBitMask = in.readInt();
    format.dwGBitMask = in.readInt();
    format.dwBBitMask = in.readInt();
    format.dwABitMask = in.readInt();
    return format;
  }
}

public final double readDouble() throws IOException {
  return Double.longBitsToDouble(readLong());
}

public Image load(final InputStream is, final boolean flipVertically) throws IOException {
  final LittleEndianDataInput in = new LittleEndianDataInput(is);
  // Read and check magic word...
  final int dwMagic = in.readInt();
  if (dwMagic != getInt("DDS ")) {
    throw new Error("Not a dds file.");
  }
  logger.finest("Reading DDS file.");
  // Create our data store;
  final DdsImageInfo info = new DdsImageInfo();
  info.flipVertically = flipVertically;
  // Read standard dds header
  info.header = DdsHeader.read(in);
  // if applicable, read DX10 header
  info.headerDX10 = info.header.ddpf.dwFourCC == getInt("DX10") ? DdsHeaderDX10.read(in) : null;
  // Create our new image
  final Image image = new Image();
  image.setWidth(info.header.dwWidth);
  image.setHeight(info.header.dwHeight);
  // update depth based on flags / header
  updateDepth(image, info);
  // add our format and image data.
  populateImage(image, info, in);
  // return the loaded image
  return image;
}

DataInput di = dis;
if (isLittleEndian) {
  di = new LittleEndianDataInput(dis);

public final short readShort() throws IOException {
  return (short) readUnsignedShort();
}

public Image load(final InputStream is, final boolean flipVertically) throws IOException {
  final LittleEndianDataInput in = new LittleEndianDataInput(is);
  // Read and check magic word...
  final int dwMagic = in.readInt();
  if (dwMagic != getInt("DDS ")) {
    throw new Error("Not a dds file.");
  }
  logger.finest("Reading DDS file.");
  // Create our data store;
  final DdsImageInfo info = new DdsImageInfo();
  info.flipVertically = flipVertically;
  // Read standard dds header
  info.header = DdsHeader.read(in);
  // if applicable, read DX10 header
  info.headerDX10 = info.header.ddpf.dwFourCC == getInt("DX10") ? DdsHeaderDX10.read(in) : null;
  // Create our new image
  final Image image = new Image();
  image.setWidth(info.header.dwWidth);
  image.setHeight(info.header.dwHeight);
  // update depth based on flags / header
  updateDepth(image, info);
  // add our format and image data.
  populateImage(image, info, in);
  // return the loaded image
  return image;
}

DataInput di = dis;
if (isLittleEndian) {
  di = new LittleEndianDataInput(dis);

public final char readChar() throws IOException {
  return (char) readUnsignedShort();
}

public final void readFully(final byte b[], final int off, final int len) throws IOException {
  // this may look over-complicated, but the problem is that the InputStream.read() methods are
  // not guaranteed to fill up the buffer you pass to it. So we need to loop until we have filled
  // up the buffer or until we reach the end of the file.
  final int bytesRead = _stream.read(b, off, len);
  if (bytesRead == -1) {
    throw new EOFException("EOF reached");
  }
  if (bytesRead < len) {
    // we didn't get all the data we wanted, so read some more
    readFully(b, off + bytesRead, len - bytesRead);
  }
}

@Before
public void setup() throws Exception {
  in = new MockInputStream();
  array = new byte[10];
  littleEndien = new LittleEndianDataInput(in);
}

  static DdsPixelFormat read(final LittleEndianDataInput in) throws IOException {
    final DdsPixelFormat format = new DdsPixelFormat();
    format.dwSize = in.readInt();
    if (format.dwSize != 32) {
      throw new Error("invalid pixel format size: " + format.dwSize);
    }
    format.dwFlags = in.readInt();
    format.dwFourCC = in.readInt();
    format.dwRGBBitCount = in.readInt();
    format.dwRBitMask = in.readInt();
    format.dwGBitMask = in.readInt();
    format.dwBBitMask = in.readInt();
    format.dwABitMask = in.readInt();
    return format;
  }
}

public final short readShort() throws IOException {
  return (short) readUnsignedShort();
}

public final double readDouble() throws IOException {
  return Double.longBitsToDouble(readLong());
}

static final ByteBuffer readDXT(final LittleEndianDataInput in, final int totalSize, final DdsImageInfo info,
    final Image image) throws IOException {
  int mipWidth = info.header.dwWidth;
  int mipHeight = info.header.dwHeight;
  final ByteBuffer buffer = BufferUtils.createByteBuffer(totalSize);
  for (int mip = 0; mip < info.header.dwMipMapCount; mip++) {
    final byte[] data = new byte[info.mipmapByteSizes[mip]];
    in.readFully(data);
    if (!info.flipVertically) {
      buffer.put(data);
    } else {
      final byte[] flipped = flipDXT(data, mipWidth, mipHeight, image.getDataFormat());
      buffer.put(flipped);
      mipWidth = Math.max(mipWidth / 2, 1);
      mipHeight = Math.max(mipHeight / 2, 1);
    }
  }
  buffer.rewind();
  return buffer;
}

public final float readFloat() throws IOException {
  return Float.intBitsToFloat(readInt());
}

public final char readChar() throws IOException {
  return (char) readUnsignedShort();
}

static final ByteBuffer readDXT(final LittleEndianDataInput in, final int totalSize, final DdsImageInfo info,
    final Image image) throws IOException {
  int mipWidth = info.header.dwWidth;
  int mipHeight = info.header.dwHeight;
  final ByteBuffer buffer = BufferUtils.createByteBuffer(totalSize);
  for (int mip = 0; mip < info.header.dwMipMapCount; mip++) {
    final byte[] data = new byte[info.mipmapByteSizes[mip]];
    in.readFully(data);
    if (!info.flipVertically) {
      buffer.put(data);
    } else {
      final byte[] flipped = flipDXT(data, mipWidth, mipHeight, image.getDataFormat());
      buffer.put(flipped);
      mipWidth = Math.max(mipWidth / 2, 1);
      mipHeight = Math.max(mipHeight / 2, 1);
    }
  }
  buffer.rewind();
  return buffer;
}

public final float readFloat() throws IOException {
  return Float.intBitsToFloat(readInt());
}

  public void run() {
    try {
      littleEndien.readFully(array);
    } catch (IOException e) {
      e.printStackTrace();
      fail("ioexception");
    }
  }
});