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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.6. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.sasn1;

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) 
        throws IOException
    {
        super(in);
        
        _b1 = in.read();
        _b2 = in.read();
        _eofReached = (_b2 < 0);
    }
    
    void setEofOn00(
        boolean eofOn00)
    {
        _eofOn00 = eofOn00;
    }
    
    void checkForEof() 
        throws IOException
    {
        if (_eofOn00 && (_b1 == 0x00 && _b2 == 0x00))
        {
            _eofReached = true;
            setParentEofDetect(true);
        }
    }
    
    public int read()
        throws IOException
    { 
        checkForEof();
        
        if (_eofReached)
        {
            return -1;
        }
    
        int b = _in.read();

        //
        // strictly speaking we should return b1 and b2, but if this happens the stream 
        // is corrupted so we are already in trouble.
        //
        if (b < 0)
        {            
            _eofReached = true;

            return -1;
        }
        
        int v = _b1;
        
        _b1 = _b2;
        _b2 = b;

        return v;
    }
}