/*
* Copyright 2010 Srikanth Reddy Lingala
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.lingala.zip4j.util;
import java.io.DataInput;
import java.io.IOException;
import net.lingala.zip4j.exception.ZipException;
public class Raw
{
public static long readLongLittleEndian(byte[] array,int pos){
long temp = 0;
temp |= array[pos+7]&0xff;
temp <<=8;
temp |= array[pos+6]&0xff;
temp <<=8;
temp |= array[pos+5]&0xff;
temp <<=8;
temp |= array[pos+4]&0xff;
temp <<=8;
temp |= array[pos+3]&0xff;
temp <<=8;
temp |= array[pos+2]&0xff;
temp <<=8;
temp |= array[pos+1]&0xff;
temp <<=8;
temp |= array[pos]&0xff;
return temp;
}
public static int readLeInt(DataInput di, byte[] b) throws ZipException{
try {
di.readFully(b, 0, 4);
} catch (IOException e) {
throw new ZipException(e);
}
return ((b[0] & 0xff) | (b[1] & 0xff) << 8)
| ((b[2] & 0xff) | (b[3] & 0xff) << 8) << 16;
}
public static int readShortLittleEndian(byte[] b, int off){
return (b[off] & 0xff) | (b[off+1] & 0xff) << 8;
}
public static final short readShortBigEndian(byte[] array, int pos) {
short temp = 0;
temp |= array[pos] & 0xff;
temp <<= 8;
temp |= array[pos + 1] & 0xff;
return temp;
}
public static int readIntLittleEndian(byte[] b, int off){
return ((b[off] & 0xff) | (b[off+1] & 0xff) << 8)
| ((b[off+2] & 0xff) | (b[off+3] & 0xff) << 8) << 16;
}
public static byte[] toByteArray(int in,int outSize) {
byte[] out = new byte[outSize];
byte[] intArray = toByteArray(in);
for( int i=0; i<intArray.length && i<outSize; i++ ) {
out[i] = intArray[i];
}
return out;
}
public static byte[] toByteArray(int in) {
byte[] out = new byte[4];
out[0] = (byte)in;
out[1] = (byte)(in >> 8);
out[2] = (byte)(in >> 16);
out[3] = (byte)(in >> 24);
return out;
}
public static final void writeShortLittleEndian(byte[] array, int pos,
short value) {
array[pos +1] = (byte) (value >>> 8);
array[pos ] = (byte) (value & 0xFF);
}
public static final void writeIntLittleEndian(byte[] array, int pos,int value) {
array[pos+3] = (byte) (value >>>24);
array[pos+2] = (byte) (value >>>16);
array[pos+1] = (byte) (value >>>8);
array[pos] = (byte) (value &0xFF);
}
public static void writeLongLittleEndian(byte[] array, int pos, long value){
array[pos+7] = (byte) (value >>>56);
array[pos+6] = (byte) (value >>>48);
array[pos+5] = (byte) (value >>>40);
array[pos+4] = (byte) (value >>>32);
array[pos+3] = (byte) (value >>>24);
array[pos+2] = (byte) (value >>>16);
array[pos+1] = (byte) (value >>>8);
array[pos] = (byte) (value &0xFF);
}
public static byte bitArrayToByte(int[] bitArray) throws ZipException {
if (bitArray == null) {
throw new ZipException("bit array is null, cannot calculate byte from bits");
}
if (bitArray.length != 8) {
throw new ZipException("invalid bit array length, cannot calculate byte");
}
if(!checkBits(bitArray)) {
throw new ZipException("invalid bits provided, bits contain other values than 0 or 1");
}
int retNum = 0;
for (int i = 0; i < bitArray.length; i++) {
retNum += Math.pow(2, i) * bitArray[i];
}
return (byte)retNum;
}
private static boolean checkBits(int[] bitArray) {
for (int i = 0; i < bitArray.length; i++) {
if (bitArray[i] != 0 && bitArray[i] != 1) {
return false;
}
}
return true;
}
public static void prepareBuffAESIVBytes(byte[] buff, int nonce, int length) {
buff[0] = (byte)nonce;
buff[1] = (byte)(nonce >> 8);
buff[2] = (byte)(nonce >> 16);
buff[3] = (byte)(nonce >> 24);
buff[4] = 0;
buff[5] = 0;
buff[6] = 0;
buff[7] = 0;
buff[8] = 0;
buff[9] = 0;
buff[10] = 0;
buff[11] = 0;
buff[12] = 0;
buff[13] = 0;
buff[14] = 0;
buff[15] = 0;
}
/**
* Converts a char array to byte array
* @param charArray
* @return byte array representation of the input char array
*/
public static byte[] convertCharArrayToByteArray(char[] charArray) {
if (charArray == null) {
throw new NullPointerException();
}
byte[] bytes = new byte[charArray.length];
for(int i=0;i<charArray.length;i++) {
bytes[i] = (byte) charArray[i];
}
return bytes;
}
}