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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.cms;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;

/**
 * a holding class for a file of data to be processed.
 */
public class CMSProcessableFile
    implements CMSTypedData, CMSReadable
{
    private static final int DEFAULT_BUF_SIZE = 32 * 1024;

    private final ASN1ObjectIdentifier type;
    private final File file;
    private final byte[] buf;

    public CMSProcessableFile(
        File file)
    {
        this(file, DEFAULT_BUF_SIZE);
    }
    
    public CMSProcessableFile(
        File file,
        int  bufSize)
    {
        this(CMSObjectIdentifiers.data, file, bufSize);
    }

    public CMSProcessableFile(
        ASN1ObjectIdentifier type,
        File file,
        int  bufSize)
    {
        this.type = type;
        this.file = file;
        buf = new byte[bufSize];
    }

    public InputStream getInputStream()
        throws IOException, CMSException
    {
        return new BufferedInputStream(new FileInputStream(file), DEFAULT_BUF_SIZE);
    }

    public void write(OutputStream zOut)
        throws IOException, CMSException
    {
        FileInputStream     fIn = new FileInputStream(file);
        int                 len;
        
        while ((len = fIn.read(buf, 0, buf.length)) > 0)
        {
            zOut.write(buf, 0, len);
        }
        
        fIn.close();
    }

    /**
     * Return the file handle.
     */
    public Object getContent()
    {
        return file;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return type;
    }
}