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package org.spongycastle.asn1;
import java.io.IOException;
import java.io.InputStream;
class ConstructedOctetStream
extends InputStream
{
private final ASN1StreamParser _parser;
private boolean _first = true;
private InputStream _currentStream;
ConstructedOctetStream(
ASN1StreamParser parser)
{
_parser = parser;
}
public int read(byte[] b, int off, int len) throws IOException
{
if (_currentStream == null)
{
if (!_first)
{
return -1;
}
ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject();
if (s == null)
{
return -1;
}
_first = false;
_currentStream = s.getOctetStream();
}
int totalRead = 0;
for (;;)
{
int numRead = _currentStream.read(b, off + totalRead, len - totalRead);
if (numRead >= 0)
{
totalRead += numRead;
if (totalRead == len)
{
return totalRead;
}
}
else
{
ASN1OctetStringParser aos = (ASN1OctetStringParser)_parser.readObject();
if (aos == null)
{
_currentStream = null;
return totalRead < 1 ? -1 : totalRead;
}
_currentStream = aos.getOctetStream();
}
}
}
public int read()
throws IOException
{
if (_currentStream == null)
{
if (!_first)
{
return -1;
}
ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject();
if (s == null)
{
return -1;
}
_first = false;
_currentStream = s.getOctetStream();
}
for (;;)
{
int b = _currentStream.read();
if (b >= 0)
{
return b;
}
ASN1OctetStringParser s = (ASN1OctetStringParser)_parser.readObject();
if (s == null)
{
_currentStream = null;
return -1;
}
_currentStream = s.getOctetStream();
}
}
}
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