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package org.openoffice.xmerge.converter.xml.sxc.pexcel.records;

import java.io.OutputStream;
import java.io.InputStream;
import java.io.IOException;

import org.openoffice.xmerge.util.Debug;
import org.openoffice.xmerge.util.EndianConverter;
import org.openoffice.xmerge.converter.xml.sxc.pexcel.PocketExcelConstants;

/**
 * Represents the codepage for the document. There is a number of unknown
 * fields which are hardcoded at construction
 */
public class CodePage implements BIFFRecord {

    private byte[] codepage = new byte[2];
    private byte[] unknown1 = new byte[2];
    private byte[] unknown2 = new byte[2];
    private byte unknown3;

    /**
     * Constructs a pocket Excel Codepage
     */
    public CodePage() {
        codepage    = new byte[] {(byte)0xE4, (byte)0x04};
        unknown1    = new byte[] {(byte)0x8C, (byte)0x01};
        unknown2    = new byte[] {(byte)0x00, (byte)0x01};
        unknown3    = 0x00;
    }

    /**
     * Constructs a pocket Excel Codepage from the<code>InputStream</code>
     *
     * @param   is InputStream containing a Pocket Excel Data file.
     */
    public CodePage(InputStream is) throws IOException {
        read(is);
    }

     /**
     * Get the hex code for this particular <code>BIFFRecord</code>
     *
     * @return the hex code for <code>BoundSheet</code>
     */
    public short getBiffType() {
        return PocketExcelConstants.CODEPAGE;
    }

    public int read(InputStream input) throws IOException {

        int numOfBytesRead  = input.read(codepage);
        numOfBytesRead      += input.read(unknown1);
        numOfBytesRead      += input.read(unknown2);
        // numOfBytesRead       += input.read(unknown3);
        unknown3            = (byte) input.read();
        numOfBytesRead++;

        Debug.log(Debug.TRACE,"\tcodepage : "+ EndianConverter.readShort(codepage) +
                            " unknown1 : " + EndianConverter.readShort(unknown1) +
                            " unknown2 : " + EndianConverter.readShort(unknown2) +
                            " unknown3 : " + unknown3);

        return numOfBytesRead;
    }

    public void write(OutputStream output) throws IOException {

        output.write(getBiffType());
        output.write(codepage);
        output.write(unknown1);
        output.write(unknown2);
        output.write(unknown3);

        Debug.log(Debug.TRACE,"Writing CodePage record");


    }

}