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// Handler.java - URLStreamHandler for core protocol.
/* Copyright (C) 2001 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.java.net.protocol.core;
import gnu.gcj.Core;
import gnu.gcj.RawData;
import java.io.InputStream;
import java.io.IOException;
public class CoreInputStream extends InputStream
{
/* A pointer to the object in memory. */
protected RawData ptr;
/* Position of the next byte in core to be read. */
protected int pos;
/* The currently marked position in the stream. */
protected int mark;
/* The index in core one greater than the last valid character. */
protected int count;
private native int unsafeGetByte (long offset);
private native int copyIntoByteArray (byte[] dest, int offset, int numBytes);
public CoreInputStream (Core core)
{
ptr = core.ptr;
count = core.length;
}
public synchronized int available()
{
return count - pos;
}
public synchronized void mark(int readAheadLimit)
{
// readAheadLimit is ignored per Java Class Lib. book, p.220.
mark = pos;
}
public boolean markSupported()
{
return true;
}
public synchronized int read()
{
if (pos < count)
return ((int) unsafeGetByte(pos++)) & 0xFF;
return -1;
}
public synchronized int read(byte[] b, int off, int len)
{
if (pos >= count)
return -1;
int numBytes = Math.min(count - pos, len);
copyIntoByteArray (b, off, numBytes);
pos += numBytes;
return numBytes;
}
public synchronized void reset()
{
pos = mark;
}
public synchronized long skip(long n)
{
// Even though the var numBytes is a long, in reality it can never
// be larger than an int since the result of subtracting 2 positive
// ints will always fit in an int. Since we have to return a long
// anyway, numBytes might as well just be a long.
long numBytes = Math.min ((long) (count - pos), n < 0 ? 0L : n);
pos += numBytes;
return numBytes;
}
}
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