Merge from the pain trainstructure-aliasing-branch

git-svn-id: https://gcc.gnu.org/svn/gcc/branches/structure-aliasing-branch@95649 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 359 insertions, 1 deletions

diff --git a/libjava/javax/imageio/stream/ImageInputStreamImpl.java b/libjava/javax/imageio/stream/ImageInputStreamImpl.java
index 3a5d6dcb6d7..dbe6d1aaab9 100644
--- a/libjava/javax/imageio/stream/ImageInputStreamImpl.java
+++ b/libjava/javax/imageio/stream/ImageInputStreamImpl.java
@@ -38,8 +38,11 @@ exception statement from your version. */
 
 package javax.imageio.stream;
 
+import java.io.DataInputStream;
+import java.io.EOFException;
 import java.io.IOException;
 import java.nio.ByteOrder;
+import java.util.Stack;
 
 /**
  * @author Michael Koch (konqueror@gmx.de)
@@ -47,6 +50,9 @@ import java.nio.ByteOrder;
 public abstract class ImageInputStreamImpl implements ImageInputStream
 {
   private boolean closed;
+  private Stack markStack = new Stack();
+  
+  byte[] buffer = new byte[8];
   
   protected int bitOffset;
   protected ByteOrder byteOrder;
@@ -99,6 +105,7 @@ public abstract class ImageInputStreamImpl implements ImageInputStream
   public int getBitOffset()
     throws IOException
   {
+    checkClosed();
     return bitOffset;
   }
 
@@ -115,6 +122,7 @@ public abstract class ImageInputStreamImpl implements ImageInputStream
   public long getStreamPosition()
     throws IOException
   {
+    checkClosed();
     return streamPos;
   }
 
@@ -138,6 +146,18 @@ public abstract class ImageInputStreamImpl implements ImageInputStream
     return -1L;
   }
 
+  public void mark()
+  {
+    try
+      {
+	markStack.push(new Long(getStreamPosition()));
+      }
+    catch (IOException e)
+      {
+	// Ignored.
+      }
+  }
+
   public abstract int read()
     throws IOException;
 
@@ -150,8 +170,346 @@ public abstract class ImageInputStreamImpl implements ImageInputStream
   public abstract int read(byte[] data, int offset, int len)
     throws IOException;
 
-  public void setByteOrder (ByteOrder byteOrder)
+  public int readBit()
+    throws IOException
+  {
+    checkClosed();
+
+    // Calc new bit offset here, readByte resets it.
+    int newOffset = (bitOffset + 1) & 0x7;
+
+    byte data = readByte();
+    
+    if (bitOffset != 0)
+      {
+	seek(getStreamPosition() - 1);
+	data = (byte) (data >> (8 - newOffset));
+      }
+
+    bitOffset = newOffset;
+    return data & 0x1;
+  }
+
+  public long readBits(int numBits)
+    throws IOException
+  {
+    checkClosed();
+
+    if (numBits < 0 || numBits > 64)
+      throw new IllegalArgumentException();
+
+    if (numBits == 0)
+      return 0L;
+
+    long bits = 0L;
+    
+    for (int i = 0; i < numBits; i++)
+      {
+	bits <<= 1;
+	bits |= readBit();
+      }
+
+    return bits;
+  }
+
+  public boolean readBoolean()
+    throws IOException
+  {
+    byte data = readByte();
+    return data != 0;
+  }
+
+  public byte readByte()
+    throws IOException
+  {
+    int data = read();
+
+    if (data == -1)
+      throw new EOFException();
+
+    return (byte) data;
+  }
+
+  public void readBytes(IIOByteBuffer buffer, int len)
+    throws IOException
+  {
+    int result = read(buffer.getData(), buffer.getOffset(), len);
+    
+    if (result == -1 || result < len)
+      throw new EOFException();
+
+    buffer.setLength(len);
+  }
+
+  public char readChar()
+    throws IOException
+  {
+    return (char) readShort();
+  }
+
+  public double readDouble()
+    throws IOException
+  {
+    return (double) readLong();
+  }
+
+  public float readFloat()
+    throws IOException
+  {
+    return (float) readInt();
+  }
+
+  public void readFully(byte[] data)
+    throws IOException
+  {
+    readFully(data, 0, data.length);
+  }
+
+  public void readFully(byte[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readByte();
+  }
+
+  public void readFully(char[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readChar();
+  }
+
+  public void readFully(double[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readDouble();
+  }
+
+  public void readFully(float[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readFloat();
+  }
+
+  public void readFully(int[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readInt();
+  }
+
+  public void readFully(long[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readLong();
+  }
+
+  public void readFully(short[] data, int offset, int len)
+    throws IOException
+  {
+    for (int i = 0; i < len; ++i)
+      data[offset + i] = readShort();
+  }
+
+  public int readInt()
+    throws IOException
+  {
+    int result = read(buffer, 0, 4);
+
+    if (result == -1)
+      throw new EOFException();
+    
+    if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
+      {
+	return ((buffer[0] & 0xff)
+		+ (buffer[1] << 8)
+		+ (buffer[2] << 16)
+		+ (buffer[3] << 24));
+      }
+
+    return ((buffer[4] << 24)
+	    + (buffer[3] << 16)
+	    + (buffer[2] << 8)
+	    + (buffer[1] & 0xff));
+  }
+
+  public String readLine()
+    throws IOException
+  {
+    checkClosed();
+
+    int c = -1;
+    boolean eol = false;
+    StringBuffer buffer = new StringBuffer();
+
+    while (!eol && (c = read()) != -1)
+      {
+	switch(c)
+	  {
+	  case '\r':
+	    // Consume following \n'
+	    long oldPosition = getStreamPosition();
+	    if (read() != '\n')
+	       seek(oldPosition);
+	  case '\n':
+	    eol = true;
+	    break;
+	  default:
+	    buffer.append((char) c);
+	    break;
+	  }
+      }
+
+    if (c == -1 && buffer.length() == 0)
+      return null;
+
+    return buffer.toString();
+  }
+
+  public long readLong()
+    throws IOException
+  {
+    int result = read(buffer, 0, 8);
+
+    if (result == -1)
+      throw new EOFException();
+    
+    if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
+      {
+        return ((buffer[0] & 0xff)
+                + (((buffer[1] & 0xff)) << 8)
+                + (((buffer[2] & 0xff)) << 16)
+                + (((buffer[3] & 0xffL)) << 24)
+                + (((buffer[4] & 0xffL)) << 32)
+                + (((buffer[5] & 0xffL)) << 40)
+                + (((buffer[6] & 0xffL)) << 48)
+                + (((long) buffer[7]) << 56));
+      }
+
+    return ((((long) buffer[7]) << 56)
+            + ((buffer[6] & 0xffL) << 48)
+            + ((buffer[5] & 0xffL) << 40)
+            + ((buffer[4] & 0xffL) << 32)
+            + ((buffer[3] & 0xffL) << 24)
+            + ((buffer[2] & 0xff) << 16)
+            + ((buffer[1] & 0xff) << 8)
+            + (buffer[0] & 0xff));
+  }
+
+  public short readShort()
+    throws IOException
+  {
+    int result = read(buffer, 0, 2);
+
+    if (result == -1)
+      throw new EOFException();
+    
+    if (getByteOrder() == ByteOrder.LITTLE_ENDIAN)
+      {
+	return (short) ((buffer[0] & 0xff)
+			+ (buffer[1] << 8));
+      }
+
+    return (short) ((buffer[0] << 8)
+		    + (buffer[1] & 0xff));
+  }
+
+  public int readUnsignedByte()
+    throws IOException
+  {
+    return readByte() & 0xff;
+  }
+
+  public long readUnsignedInt()
+    throws IOException
+  {
+    return readInt() & 0xffffffff;
+  }
+
+  public int readUnsignedShort()
+    throws IOException
+  {
+    return readShort() & 0xffff;
+  }
+
+  public String readUTF()
+    throws IOException
+  {
+    checkClosed();
+
+    String data;
+    ByteOrder old = getByteOrder();
+    setByteOrder(ByteOrder.BIG_ENDIAN); // Strings are always big endian.
+
+    try
+      {
+	data = DataInputStream.readUTF(this);
+      }
+    finally
+      {
+	setByteOrder(old);
+      }
+    
+    return data;
+  }
+
+  public void reset()
+    throws IOException
+  {
+    checkClosed();
+    
+    long mark = ((Long) markStack.pop()).longValue();
+    seek(mark);
+  }
+
+  public void seek(long position)
+    throws IOException
+  {
+    checkClosed();
+
+    if (position < getFlushedPosition())
+      throw new IndexOutOfBoundsException("position < flushed position");
+
+    streamPos = position;
+    bitOffset = 0;
+  }
+
+  public void setBitOffset (int bitOffset)
+    throws IOException
+  {
+    checkClosed();
+    
+    if (bitOffset < 0 || bitOffset > 7)
+      throw new IllegalArgumentException();
+
+    this.bitOffset = bitOffset;
+  }
+
+  public void setByteOrder(ByteOrder byteOrder)
   {
     this.byteOrder = byteOrder;
   }
+
+  public int skipBytes(int num)
+    throws IOException
+  {
+    checkClosed();
+    
+    seek(getStreamPosition() + num);
+    bitOffset = 0;
+    return num;
+  }
+
+  public long skipBytes(long num)
+    throws IOException
+  {
+    checkClosed();
+    
+    seek(getStreamPosition() + num);
+    bitOffset = 0;
+    return num;
+  }
 }