Java IO.pdf - Nguyen Dang Binh

public class DirectDeflater {
}
public final static String DEFLATE_SUFFIX = ".dfl";
public static void main(String[] args) {
}
Deflater def = new Deflater();
byte[] input = new byte[1024];
byte[] output = new byte[1024];
for (int i = 0; i < args.length; i++) {
}
try {
FileInputStream fin = new FileInputStream(args[i]);
FileOutputStream fout = new FileOutputStream(args[i] +
DEFLATE_SUFFIX);
while (true) { // read and deflate the data
// Fill the input array.
int numRead = fin.read(input);
if (numRead == -1) { // end of stream
// Deflate any data that remains in the input buffer.
def.finish();
while (!def.finished()) {
int numCompressedBytes = def.deflate(output, 0,
output.length);
if (numCompressedBytes > 0) {
fout.write(output, 0, numCompressedBytes);
} // end if
} // end while
break; // Exit while loop.
} // end if
else { // Deflate the input.
def.setInput(input, 0, numRead);
while (!def.needsInput()) {
int numCompressedBytes = def.deflate(output, 0,
output.length);
if (numCompressedBytes > 0) {
fout.write(output, 0, numCompressedBytes);
} // end if
} // end while
} // end else
} // end while
fin.close();
fout.flush();
fout.close();
def.reset();
} // end try
catch (IOException e) {System.err.println(e);}
Java I/O
This program is more complicated than it needs to be, because it has to read the file in small
chunks. In Example 9.3, later in this chapter, you'll see a simpler program that achieves the
same result using the DeflaterOutputStream class.
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