Java I/O

File Viewer, Part 4

Because of the nature of filter streams, it is relatively straightforward to add decompression services to the FileDumper program last seen in Chapter 7. Generally, you’ll want to decompress a file before dumping it. Adding decompression does not require a new dump filter. Instead, it simply requires passing the file through an inflater input stream before passing it to one of the dump filters. We’ll let the user choose from either gzipped or deflated files with the command-line switches -gz and -deflate. When one of these switches is seen, the appropriate inflater input stream is selected; it is an error to select both. Example 9.15, FileDumper4 , demonstrates.

Example 9-15. FileDumper4

import java.io.*; import java.util.zip.*; import com.macfaq.io.*; public class FileDumper4 { public static final int ASC = 0; public static final int DEC = 1; public static final int HEX = 2; public static final int SHORT = 3; public static final int INT = 4; public static final int LONG = 5; public static final int FLOAT = 6; public static final int DOUBLE = 7; public static void main(String[] args) { if (args.length < 1) { System.err.println("Usage: java FileDumper4 [-ahdsilfx] [-little]"+ "[-gzip|-deflated] file1..."); } boolean bigEndian = true; int firstFile = 0; int mode = ASC; boolean deflated = false; boolean gzipped = false; // Process command-line switches. for (firstFile = 0; firstFile < args.length; firstFile++) { if (!args[firstFile].startsWith("-")) break; if (args[firstFile].equals("-h")) ...