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package org.spongycastle.asn1;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
class IndefiniteLengthInputStream
extends LimitedInputStream
{
private int _b1;
private int _b2;
private boolean _eofReached = false;
private boolean _eofOn00 = true;
IndefiniteLengthInputStream(
InputStream in,
int limit)
throws IOException
{
super(in, limit);
_b1 = in.read();
_b2 = in.read();
if (_b2 < 0)
{
// Corrupted stream
throw new EOFException();
}
checkForEof();
}
void setEofOn00(
boolean eofOn00)
{
_eofOn00 = eofOn00;
checkForEof();
}
private boolean checkForEof()
{
if (!_eofReached && _eofOn00 && (_b1 == 0x00 && _b2 == 0x00))
{
_eofReached = true;
setParentEofDetect(true);
}
return _eofReached;
}
public int read(byte[] b, int off, int len)
throws IOException
{
// Only use this optimisation if we aren't checking for 00
if (_eofOn00 || len < 3)
{
return super.read(b, off, len);
}
if (_eofReached)
{
return -1;
}
int numRead = _in.read(b, off + 2, len - 2);
if (numRead < 0)
{
// Corrupted stream
throw new EOFException();
}
b[off] = (byte)_b1;
b[off + 1] = (byte)_b2;
_b1 = _in.read();
_b2 = _in.read();
if (_b2 < 0)
{
// Corrupted stream
throw new EOFException();
}
return numRead + 2;
}
public int read()
throws IOException
{
if (checkForEof())
{
return -1;
}
int b = _in.read();
if (b < 0)
{
// Corrupted stream
throw new EOFException();
}
int v = _b1;
_b1 = _b2;
_b2 = b;
return v;
}
}
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