FileDumper Class in java

FileDumper Class in java

import java.io.*; import com.elharo.io.*;  public class FileDumper {    public static final int ASC = 0;   public static final int DEC = 1;   public static final int HEX = 2;    public static void main(String[] args) {      if (args.length < 1) {       System.err.println("Usage: java FileDumper [-ahd] file1 file2...");       return;     }      int firstArg = 0;     int mode = ASC;      if (args[0].startsWith("-")) {       firstArg = 1;       if (args[0].equals("-h")) mode = HEX;       else if (args[0].equals("-d")) mode = DEC;     }      for (int i = firstArg; i < args.length; i++) {       try {         if (mode == ASC) dumpAscii(args[i]);         else if (mode == HEX) dumpHex(args[i]);         else if (mode == DEC) dumpDecimal(args[i]);          }         catch (IOException ex) {         System.err.println("Error reading from " + args[i] + ": "           + ex.getMessage());       }        if (i < args.length-1) {  // more files to dump         System.out.println("\r\n--------------------------------------\r\n");       }     }   }    public static void dumpAscii(String filename) throws IOException {      FileInputStream fin = null;     try {       fin = new FileInputStream(filename);       StreamCopier.copy(fin, System.out);     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpDecimal(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[16];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int dec = buffer[i];           if (dec < 0) dec = 256 + dec;           if (dec < 10) System.out.print("00" + dec + " ");           else if (dec < 100) System.out.print("0" + dec + " ");           else System.out.print(dec + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   }    public static void dumpHex(String filename) throws IOException {      FileInputStream fin = null;     byte[] buffer = new byte[24];     boolean end = false;      try {       fin = new FileInputStream(filename);       while (!end) {         int bytesRead = 0;         while (bytesRead < buffer.length) {           int r = fin.read(buffer, bytesRead, buffer.length - bytesRead);           if (r == -1) {             end = true;             break;           }           bytesRead += r;         }         for (int i = 0; i < bytesRead; i++) {           int hex = buffer[i];           if (hex < 0) hex = 256 + hex;           if (hex >= 16) System.out.print(Integer.toHexString(hex) + " ");           else System.out.print("0" + Integer.toHexString(hex) + " ");         }         System.out.println();       }     }     finally {       if (fin != null) fin.close();     }   } }