Package com.anotherbigidea.flash.readers

Source Code of com.anotherbigidea.flash.readers.SWFReader

/****************************************************************
* Copyright (c) 2001, David N. Main, All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. The name of the author may not be used to endorse or
* promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
****************************************************************/
package com.anotherbigidea.flash.readers;

import java.io.*;
import com.anotherbigidea.io.*;
import com.anotherbigidea.flash.structs.Rect;
import com.anotherbigidea.flash.*;
import com.anotherbigidea.flash.interfaces.*;
import com.anotherbigidea.flash.writers.SWFWriter;

/**
* Reads a SWF input stream and drives the SWFConsumer interface.
*/
public class SWFReader
{
    protected SWFTags     consumer;
    protected InStream    in;
    protected InputStream inputstream;
   
    public SWFReader( SWFTags consumer, InputStream inputstream )
    {
        this.consumer    = consumer;
        this.inputstream = inputstream;
        this.in          = new InStream( inputstream );
    }

    public SWFReader( SWFTags consumer, InStream instream )
    {
        this.consumer = consumer;
        this.in       = instream;
    }   
   
    /**
     * Drive the consumer by reading a SWF File - including the header and all tags
     */
    public void readFile() throws IOException
    {
        readHeader();
        readTags();
    }
   
    /**
     * Drive the consumer by reading SWF tags only
     */
    public void readTags() throws IOException
    {
        while( readOneTag() != SWFConstants.TAG_END );
    }
   
    /**
     * Drive the consumer by reading one tag
     * @return the tag type
     */
    public int readOneTag() throws IOException
    {
        int header = in.readUI16();
       
        int  type   = header >> 6;    //only want the top 10 bits
        int  length = header & 0x3F//only want the bottom 6 bits
        boolean longTag = (length == 0x3F);
       
        if( longTag )
        {
            length = (int)in.readUI32();
        }
       
        byte[] contents = in.read( length );
       
        consumer.tag( type, longTag, contents );
       
        return type;
    }
   
    /**
     * Only read the SWF file header
     */
    public void readHeader() throws IOException
    {
        //--Verify File Signature
        if( ( in.readUI8() != 0x46 ) ||  // "F"
            ( in.readUI8() != 0x57 ) ||  // "W"
            ( in.readUI8() != 0x53 ) )   // "S"
        {
            throw new IOException( "Invalid SWF File Signature" );
        }

        int  version   = in.readUI8();
        long length    = in.readUI32();
        Rect frameSize = new Rect( in );
        int frameRate  = in.readUI16() >> 8;
        int frameCount = in.readUI16();               
       
        consumer.header( version, length,
                         frameSize.getMaxX(), frameSize.getMaxY(),
                         frameRate, frameCount );                        
    }
   
    public static void main( String[] args ) throws IOException
    {
        SWFWriter writer = new SWFWriter( System.out );
        SWFReader reader = new SWFReader( writer, System.in );
        reader.readFile();
        System.out.flush();
    }
}
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