com.braintree.org.bouncycastle.asn1.IndefiniteLengthInputStream Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of encryption Show documentation

Client side encryption for Braintree integrations on Android.

The newest version!

package com.braintree.org.bouncycastle.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;
    }
}