/*
* Flazr <http://flazr.com> Copyright (C) 2009 Peter Thomas.
*
* This file is part of Flazr.
*
* Flazr is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Flazr is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Flazr. If not, see <http://www.gnu.org/licenses/>.
*/
package com.flazr.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.jboss.netty.buffer.ChannelBuffer;
public class Utils {
private Utils() { }
private static final char[] HEX_DIGITS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
private static final char BYTE_SEPARATOR = ' ';
public static String toHex(final byte[] ba) {
return toHex(ba, false);
}
public static String toHex(final byte[] ba, final boolean withSeparator) {
return toHex(ba, 0, ba.length, withSeparator);
}
public static String toHex(final byte[] ba, final int offset, final int length, final boolean withSeparator) {
final char[] buf;
if (withSeparator) {
buf = new char[length * 3];
} else {
buf = new char[length * 2];
}
for (int i = offset, j = 0; i < offset + length;) {
final char[] chars = toHexChars(ba[i++]);
buf[j++] = chars[0];
buf[j++] = chars[1];
if (withSeparator) {
buf[j++] = BYTE_SEPARATOR;
}
}
return new String(buf);
}
private static char[] toHexChars(final int b) {
final char left = HEX_DIGITS[(b >>> 4) & 0x0F];
final char right = HEX_DIGITS[b & 0x0F];
return new char[]{left, right};
}
public static String toHex(final byte b) {
final char[] chars = toHexChars(b);
return String.valueOf(chars);
}
public static byte[] fromHex(final char[] hex) {
final int length = hex.length / 2;
final byte[] raw = new byte[length];
for (int i = 0; i < length; i++) {
final int high = Character.digit(hex[i * 2], 16);
final int low = Character.digit(hex[i * 2 + 1], 16);
int value = (high << 4) | low;
if (value > 127) {
value -= 256;
}
raw[i] = (byte) value;
}
return raw;
}
public static byte[] fromHex(final String s) {
return fromHex(s.replace(" ", "").toCharArray());
}
public static byte[] toInt24(final int value) {
return new byte[] {(byte)(value >>> 16), (byte)(value >>> 8), (byte)value};
}
public static int readInt32Reverse(final ChannelBuffer in) {
final byte a = in.readByte();
final byte b = in.readByte();
final byte c = in.readByte();
final byte d = in.readByte();
int val = 0;
val += d << 24;
val += c << 16;
val += b << 8;
val += a;
return val;
}
public static void writeInt32Reverse(final ChannelBuffer out, final int value) {
out.writeByte((byte) (0xFF & value));
out.writeByte((byte) (0xFF & (value >> 8)));
out.writeByte((byte) (0xFF & (value >> 16)));
out.writeByte((byte) (0xFF & (value >> 24)));
}
public static CharSequence readAsString(String fileName) {
return readAsString(new File(fileName));
}
public static CharSequence readAsString(File file) {
StringBuilder sb = new StringBuilder();
try {
FileInputStream fis = new FileInputStream(file);
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
String s;
while ((s = reader.readLine()) != null) {
sb.append(s);
}
reader.close();
return sb;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static byte[] readAsByteArray(String fileName) {
File file = new File(fileName);
return readAsByteArray(file, file.length());
}
public static byte[] readAsByteArray(String fileName, int length) {
return readAsByteArray(new File(fileName), length);
}
public static byte[] readAsByteArray(File file) {
return readAsByteArray(file, file.length());
}
public static byte[] readAsByteArray(File file, long length) {
try {
byte[] bytes = new byte[(int) length];
int offset = 0;
int numRead = 0;
FileInputStream is = new FileInputStream(file);
while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
is.close();
return bytes;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String getOverHttp(String url) {
HttpClient client = new DefaultHttpClient();
HttpGet method = new HttpGet(url);
String result = null;
try {
HttpResponse response = client.execute(method);
result = EntityUtils.toString(response.getEntity());
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
public static byte[] sha256(final byte[] message, final byte[] key) {
final Mac mac;
try {
mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(key, "HmacSHA256"));
} catch (Exception e) {
throw new RuntimeException(e);
}
return mac.doFinal(message);
}
public static void sendStopSignal(int port) {
try {
Socket s = new Socket(InetAddress.getByName("127.0.0.1"), port);
OutputStream out = s.getOutputStream();
System.err.println("sending server stop request");
out.write(("\r\n").getBytes());
out.flush();
s.close();
} catch(Exception e) {
// can happen when called twice by jvm shutdown hook
System.err.println("stop monitor thread has terminated");
}
}
private static final String COPYRIGHT_NOTICE =
"\nFlazr <http://flazr.com> Copyright (C) 2009 Peter Thomas.\n"
+ "This program comes with ABSOLUTELY NO WARRANTY.\n"
+ "Flazr is free software, and you are welcome to redistribute it\n"
+ "under certain conditions. You should have received a copy of the\n"
+ "GNU Lesser General Public License along with Flazr.\n"
+ "If not, see <http://www.gnu.org/licenses/>\n";
public static void printlnCopyrightNotice() {
System.err.println(COPYRIGHT_NOTICE);
}
public static String trimSlashes(final String raw) {
if(raw == null) {
return null;
}
return raw.replace("/", "").replace("\\", "");
}
}