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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.est;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class CTEChunkedInputStream
    extends InputStream
{
    private InputStream src;
    int chunkLen = 0;


    public CTEChunkedInputStream(InputStream inputStream)
    {
        this.src = inputStream;
    }

    private String readEOL()
        throws IOException
    {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        int c = 0;

        for (; ; )
        {
            c = src.read();
            if (c == -1)
            {
                if (bos.size() == 0)
                {
                    return null; // End of data
                }
                // return remaining buffer
                return bos.toString().trim();
            }
            bos.write(c & 0xFF);

            if (c == '\n')
            {
                return bos.toString().trim();
            }
        }
    }

    public int read()
        throws IOException
    {
        if (chunkLen == Integer.MIN_VALUE)
        {
            return -1;
        }

        if (chunkLen == 0)
        {
            String line = null;
            do
            {
                line = readEOL();
            }
            while (line != null && line.length() == 0); // skip empty lines.
            if (line == null)
            {
                return -1;
            }
            chunkLen = Integer.parseInt(line.trim(), 16);
            if (chunkLen == 0)
            {
                // Last block, burn off last line
                readEOL();
                chunkLen = Integer.MIN_VALUE;
                return -1;
            }
        }

        int i = src.read();
        chunkLen--;
        return i;
    }
}