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package org.bouncycastle.asn1;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import org.bouncycastle.util.io.Streams;
class DefiniteLengthInputStream
extends LimitedInputStream
{
private static final byte[] EMPTY_BYTES = new byte[0];
private final int _originalLength;
private int _remaining;
DefiniteLengthInputStream(
InputStream in,
int length)
{
super(in, length);
if (length < 0)
{
throw new IllegalArgumentException("negative lengths not allowed");
}
this._originalLength = length;
this._remaining = length;
if (length == 0)
{
setParentEofDetect(true);
}
}
int getRemaining()
{
return _remaining;
}
public int read()
throws IOException
{
if (_remaining == 0)
{
return -1;
}
int b = _in.read();
if (b < 0)
{
throw new EOFException("DEF length " + _originalLength + " object truncated by " + _remaining);
}
if (--_remaining == 0)
{
setParentEofDetect(true);
}
return b;
}
public int read(byte[] buf, int off, int len)
throws IOException
{
if (_remaining == 0)
{
return -1;
}
int toRead = Math.min(len, _remaining);
int numRead = _in.read(buf, off, toRead);
if (numRead < 0)
{
throw new EOFException("DEF length " + _originalLength + " object truncated by " + _remaining);
}
if ((_remaining -= numRead) == 0)
{
setParentEofDetect(true);
}
return numRead;
}
byte[] toByteArray()
throws IOException
{
if (_remaining == 0)
{
return EMPTY_BYTES;
}
byte[] bytes = new byte[_remaining];
if ((_remaining -= Streams.readFully(_in, bytes)) != 0)
{
throw new EOFException("DEF length " + _originalLength + " object truncated by " + _remaining);
}
setParentEofDetect(true);
return bytes;
}
}
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