Utilities - Data Structures and Problem Solving Using Java - page 494

1 class Hzip
2 {
3 public static void compress( String inFile ) throws IOException
4 {
5 String compressedFile = inFile + ".huf";
6 InputStream in = new BufferedInputStream(
7 new FileInputStream( inFile ) );
8 OutputStream fout = new BufferedOutputStream(
9 new FileOutputStream( compressedFile ) );
10 HZIPOutputStream hzout = new HZIPOutputStream( fout );
11 int ch;
12 while( ( ch = in.read( ) ) != -1 )
13 hzout.write( ch );
14 in.close( );
15 hzout.close( );
16 }
17
18 public static void uncompress( String compressedFile ) throws IOException
19 {
20 String inFile;
21 String extension;
22
23 inFile = compressedFile.substring( 0, compressedFile.length( ) - 4 );
24 extension = compressedFile.substring( compressedFile.length( ) - 4 );
25
26 if( !extension.equals( ".huf" ) )
27 {
28 System.out.println( "Not a compressed file!" );
29 return;
30 }
31
32 inFile += ".uc"; // for debugging, to not clobber original
33 InputStream fin = new BufferedInputStream(
34 new FileInputStream( compressedFile ) );
35 DataInputStream in = new DataInputStream( fin );
36 HZIPInputStream hzin = new HZIPInputStream( in );
37
38 OutputStream fout = new BufferedOutputStream(
39 new FileOutputStream( inFile ) );
40 int ch;
41 while( ( ch = hzin.read( ) ) != -1 )
42 fout.write( ch );
43
44 hzin.close( );
45 fout.close( );
46 }
47 }
figure 12.25
A simple main for file compression and uncompression