import java.io.FileInputStream;

import java.io.IOException;

import java.io.FileNotFoundException;

public class Crc32 {

private int value;

private int[] table = new int[256];

private static final int SEED = 0xEDB88320;

public Crc32() {

for(int i = 0; i < 256; ++i) {

int v = i;

for(int j = 0; j < 8; ++j) {

v = (v & 1) == 1 ? (SEED ^ (v >>> 1)) : (v >>> 1);

}

this.table[i] = v;

}

}

public void start() {

value = 0xFFFFFFFF;

}

public void update(byte[] bytes, int length) {

for(int i = 0; i < length; ++i) {

this.value = this.table[((this.value ^ bytes[i]) & 0xFF)] ^ (this.value >>> 8);

}

}

public int result() {

return (this.value ^ 0xFFFFFFFF);

}

public static void main(String[] args) throws IOException {

Crc32 crc = new Crc32();

byte[] buf = new byte[1024 * 1024];

int len;

for (String filename : args) {

FileInputStream fs = null;

try {

fs = new FileInputStream(filename);

crc.start();

while((len = fs.read(buf)) > 0) {

crc.update(buf, len);

}

System.out.format("%s: %08x\n", filename, crc.result());

} catch (FileNotFoundException ex) {

} finally {

if (fs != null) {

fs.close();

}

}

}

}

}