Late Night VRML 2.0 with Java CD-ROM/code.zip/Ch13/qar.java

Text File | 1997-01-14 | 3KB | 69 lines

// Quake archive file class

// Written by Bernie Roehl, October 1996

// Based on the Quake Specs 3.2 document

import java.io.*;
import quake.*;

public class qar {
        public static void main(String[] args) throws IOException {
                if (args.length < 1) {
                        System.err.println("Usage: qar cmd [filename [names [...]]]");
                        System.exit(1);
                }
                String cmd = args[0];
                String filename = (args.length > 1) ? args[1] : "pak0.pak";
                RandomAccessFile quakefile = new RandomAccessFile(filename, "r");
                if (quakefile.readInt() != 0x5041434B) {
                        System.err.println("missing signature");
                        System.exit(2);
                }
                int diroffset = swap32(quakefile.readInt());
                int dirsize = swap32(quakefile.readInt());
                int n_direntries = dirsize / 64;  // 64 byte per directory entry
                quakefile.seek(diroffset);
                String prefix = "";
                if (args.length > 2)
                        prefix = args[2];
                for (int i = 0; i < n_direntries; ++i) {
                        byte[] fname = new byte[0x38];
                        quakefile.read(fname);
                        String subfilename = new String(fname, 0);
                        int zerobyte = subfilename.indexOf(0);
                        if (zerobyte >= 0)
                                subfilename = subfilename.substring(0, zerobyte);
                        int offset = swap32(quakefile.readInt());
                        int size = swap32(quakefile.readInt());
                        if (cmd.charAt(0) == 't') {
                                if (subfilename.startsWith(prefix))
                                        System.out.println(size + " " + subfilename);
                        }
                        else if (subfilename.startsWith(prefix)) {
                                System.out.println("Extracting " + subfilename);
                                FileOutputStream out = new FileOutputStream(subfilename);
                                long savedpos = quakefile.getFilePointer();
                                quakefile.seek(offset);
                                byte[] buffer = new byte[1024];
                                do {
                                        int n = quakefile.read(buffer);
                                        out.write(buffer, 0, n);
                                        size -= n;
                                } while (size > 0);
                                quakefile.seek(savedpos);
                        }
                }
        }

        static int swap32(int value) {
                return
                       ((value >> 24) & 0x000000FF) +
                       ((value >> 8)  & 0x0000FF00) +
                       ((value << 8)  & 0x00FF0000) +
                       ((value << 24) & 0xFF000000);
        }

}