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package com.sun.mail.handlers;

import java.io.*;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import javax.activation.*;
import javax.mail.internet.*;

/**
 * DataContentHandler for image/gif.
 */
public class image_gif implements DataContentHandler {
    private static ActivationDataFlavor myDF = new ActivationDataFlavor(
	java.awt.Image.class,
	"image/gif",
	"GIF Image");

    protected ActivationDataFlavor getDF() {
	return myDF;
    }

    /**
     * Return the DataFlavors for this <code>DataContentHandler</code>.
     *
     * @return The DataFlavors
     */
    public DataFlavor[] getTransferDataFlavors() { // throws Exception;
	return new DataFlavor[] { getDF() };
    }

    /**
     * Return the Transfer Data of type DataFlavor from InputStream.
     *
     * @param df The DataFlavor
     * @param ds The DataSource corresponding to the data
     * @return String object
     */
    public Object getTransferData(DataFlavor df, DataSource ds)
			throws IOException {
	// use myDF.equals to be sure to get ActivationDataFlavor.equals,
	// which properly ignores Content-Type parameters in comparison
	if (getDF().equals(df))
	    return getContent(ds);
	else
	    return null;
    }

    public Object getContent(DataSource ds) throws IOException {
	InputStream is = ds.getInputStream();
	int pos = 0;
	int count;
	byte buf[] = new byte[1024];

	while ((count = is.read(buf, pos, buf.length - pos)) != -1) {
	    pos += count;
	    if (pos >= buf.length) {
		int size = buf.length;
		if (size < 256*1024)
		    size += size;
		else
		    size += 256*1024;
		byte tbuf[] = new byte[size];
		System.arraycopy(buf, 0, tbuf, 0, pos);
		buf = tbuf;
	    }
	}
	Toolkit tk = Toolkit.getDefaultToolkit();
	return tk.createImage(buf, 0, pos);
    }

    /**
     * Write the object to the output stream, using the specified MIME type.
     */
    public void writeTo(Object obj, String type, OutputStream os)
			throws IOException {
	if (!(obj instanceof Image))
	    throw new IOException("\"" + getDF().getMimeType() +
		"\" DataContentHandler requires Image object, " +
		"was given object of type " + obj.getClass().toString());

	throw new IOException(getDF().getMimeType() + " encoding not supported");
    }
}
