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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.mime;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.mime.smime.SMimeParserContext;

public class CanonicalOutputStream
    extends FilterOutputStream
{
    protected int lastb;
    protected static byte newline[];
    private final boolean is7Bit;

    public CanonicalOutputStream(SMimeParserContext parserContext, Headers headers, OutputStream outputstream)
    {
        super(outputstream);
        lastb = -1;
        // TODO: eventually may need to handle multiparts with binary...
        if (headers.getContentType() != null)
        {
            is7Bit = headers.getContentType() != null && !headers.getContentType().equals("binary");
        }
        else
        {
            is7Bit = parserContext.getDefaultContentTransferEncoding().equals("7bit");
        }
    }

    public void write(int i)
        throws IOException
    {
        if (is7Bit)
        {
            if (i == '\r')
            {
                out.write(newline);
            }
            else if (i == '\n')
            {
                if (lastb != '\r')
                {
                    out.write(newline);
                }
            }
            else
            {
                out.write(i);
            }
        }
        else
        {
            out.write(i);
        }
        
        lastb = i;
    }

    public void write(byte[] buf)
        throws IOException
    {
        this.write(buf, 0, buf.length);
    }

    public void write(byte buf[], int off, int len)
        throws IOException
    {
        for (int i = off; i != off + len; i++)
        {
            this.write(buf[i]);
        }
    }

    public void writeln()
        throws IOException
    {
        super.out.write(newline);
    }

    static 
    {
        newline = new byte[2];
        newline[0] = '\r';
        newline[1] = '\n';
    }
}