一点对m3g模型文件解析的工作

因为最近不会在m3g文件上继续工作，把之前一点少少的工作放出来，希望可以有点帮助

/*
 * Main.java
 *
 * Created on 2005年5月15日, 下午11:41
 */
package m3gloader;
import java.io.*;
import java.util.zip.*;
/**
 *
 * @author admin
 */
public class Main {
    
    /** Creates a new instance of Main */
    public Main() {
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws Exception {
        File f=new File("otokka_jump2.m3g");
        System.out.println("\nFile \""+f.toString()+"\" exists? : "+f.exists());
        if(!f.exists())
            err("File "+f.toString()+" does not exists!");
        FileInputStream fis=new FileInputStream(f);
        M3GDataInputStream dis=new M3GDataInputStream(fis);
        System.out.println("====== File identifier ======");
        byte[] fileIdentifier=new byte[12];
        if(dis.available()>=12){
            dis.read(fileIdentifier);
            System.out.println("File Identifier is: ");
            for(int l=0;l<fileIdentifier.length;l++)
                System.out.print(fileIdentifier[l]+" ");
            System.out.print("\nFile Identifier characters is: \n");
            System.out.println(new String(fileIdentifier));
            System.out.println("====== end of file identifier ======\n");
        } else
            err("File Identifier Error! ");
        
        /*
        Section 0: Header Object
         */
        System.out.println("====== Section 0: Header Object ======");
        if(dis.available()<5)
            err("Section 0: Header error! ");
        System.out.println("CompressionScheme: "+dis.readByte());
        UInt32 totalSectionLength=dis.readUInt32();
        //We have read 5 bytes.So we just check if (totalSectionLength.longvalue()-5) is available.
        if(dis.available()<totalSectionLength.longvalue()-5)
            err("Section 0: Content error! ");
        System.out.println("TotalSectionLength: "+totalSectionLength);
        System.out.println("UncompressedLength: "+dis.readUInt32());
        System.out.println("$$$$$$ Objects $$$$$$");
        System.out.println("ObjectType: "+dis.readByte());
        //length1 is the length of 1st object we load, length2 is the 2nd.
        UInt32 length1=dis.readUInt32();
        System.out.println("Length: "+length1);
        
        System.out.print("VersionNumber: ");
        System.out.print(dis.readByte()+".");
        System.out.println(dis.readByte());
        
        System.out.println("hasExternalReferences: "+dis.readBoolean());
        System.out.println("TotalFileSize: "+dis.readUInt32());
        System.out.println("ApproximateContentSize: "+dis.readUInt32());
        
        /*
        Head Object contain:
        Byte[2] VersionNumber
        Boolean hasExternalReferences
        UInt32  TotalFileSize
        UInt32  ApproximateContentSize
        String  AuthoringField
        So AuthoringField's length is object (length-11)
         */
        byte[] authoringField=new byte[length1.intvalue()-11];
        dis.readFully(authoringField);
        System.out.println("------ AuthoringField ------");
        System.out.println(new String(authoringField,"UTF-8"));
        System.out.println("------ End of AuthoringField ------");
        System.out.println("$$$$$$ End of Objects $$$$$$");
        System.out.println("Checksum: "+dis.readUInt32());
        System.out.println("====== End of Section 0: Header Object ======\n");
        
        
        //new section
        System.out.println(dis.readByte());
        System.out.println(dis.readUInt32());
        System.out.println(dis.readUInt32());
        M3GInflaterInputStream iis=new M3GInflaterInputStream(fis);
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        /////////////////////a camera
        //user id
        System.out.println(iis.readUInt32());
        //animation track
        System.out.println(iis.readUInt32());
        //user para
        System.out.println(iis.readUInt32());
        //hasComponentTransform;
        System.out.println(iis.read());
        //hasGeneralTransform;
        System.out.println(iis.read());
        //enable rendering
        System.out.println(iis.read());
        // enablePicking;
        System.out.println(iis.read());
        // alphaFactor;
        System.out.println(iis.read());
        //scope;
        System.out.println(iis.readUInt32());    
        //hasAlignment;
        System.out.println(iis.read());
        //h
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());    
        System.out.println(iis.readUInt32());    
        System.out.println(iis.readUInt32());    
        System.out.println(iis.readUInt32());    
/////////////next object/////////////////////
        //image 2d
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        //user id
        System.out.println(iis.readUInt32());
        //animation tracks
        System.out.println(iis.readUInt32());
        //user object
        System.out.println(iis.readUInt32());
        //format
        System.out.println(iis.read());
        //is mutable
        System.out.println(iis.read());
        //width
        System.out.println(iis.readUInt32());
        //height
        System.out.println(iis.readUInt32());
        //  palette;
        System.out.println(iis.read());
        //pixels;
        System.out.println(iis.read());
        /*
        for(int l=0;l<4894;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<40;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<66;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<66;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<66;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<41;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<29;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<25;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
        
        for(int l=0;l<68;l++)
            iis.read();
        System.out.println(iis.read());
        System.out.println(iis.readUInt32());
    */
        dis.close();
        fis.close();
    }
    
    public static void err(String msg){
        System.out.println("\n**** An error has occured!!! The program was terminated!!! The errot infomation is: ");
        System.out.println(msg+"\n");
        System.exit(0);
    }
    
    static class M3GDataInputStream extends DataInputStream{
        
        public M3GDataInputStream(InputStream in){
            super(in);
        }
        
        public UInt32 readUInt32() throws IOException {
            int ch1 = in.read();
            int ch2 = in.read();
            int ch3 = in.read();
            long ch4 = in.read();
            //System.out.println(ch1+" "+ch2+" "+ch3+" "+ch4);
            if ((ch1 | ch2 | ch3 | ch4) < 0)
                throw new EOFException();
            return new UInt32((ch1 << 0) + (ch2 << 8) + (ch3 << 16) + (ch4 << 24));
        }
    }
    
    static class M3GInflaterInputStream extends InflaterInputStream{
        
        public M3GInflaterInputStream(InputStream in){
            super(in,new Inflater(),32);
        }
        
        public UInt32 readUInt32() throws IOException {
            int ch1 = super.read();
            int ch2 = super.read();
            int ch3 = super.read();
            long ch4 = super.read();
            //System.out.println(ch1+" "+ch2+" "+ch3+" "+ch4);
            if ((ch1 | ch2 | ch3 | ch4) < 0)
                throw new EOFException();
            return new UInt32((ch1 << 0) + (ch2 << 8) + (ch3 << 16) + (ch4 << 24));
        }
    }
    static class Float32{
        
    }
    static class UInt32{
        private long value;
        
        public UInt32(long value){
            this.value=value;
            Integer f=new Integer(2);
            
        }
        
        public long longvalue(){
            return value;
        }
        
        public int intvalue(){
            if(value > 2147483647 && value < -2147483648)
                throw new ClassCastException();
            return (int)value;
        }
        
        public String toString(){
            return Long.toString(value);
        }
    }
}