session-android/src/org/thoughtcrime/securesms/util/Conversions.java
2014-11-12 15:29:59 -08:00

181 lines
5.3 KiB
Java

/**
* Copyright (C) 2014 Open Whisper Systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.thoughtcrime.securesms.util;
public class Conversions {
public static byte intsToByteHighAndLow(int highValue, int lowValue) {
return (byte)((highValue << 4 | lowValue) & 0xFF);
}
public static int highBitsToInt(byte value) {
return (value & 0xFF) >> 4;
}
public static int lowBitsToInt(byte value) {
return (value & 0xF);
}
public static int highBitsToMedium(int value) {
return (value >> 12);
}
public static int lowBitsToMedium(int value) {
return (value & 0xFFF);
}
public static byte[] shortToByteArray(int value) {
byte[] bytes = new byte[2];
shortToByteArray(bytes, 0, value);
return bytes;
}
public static int shortToByteArray(byte[] bytes, int offset, int value) {
bytes[offset+1] = (byte)value;
bytes[offset] = (byte)(value >> 8);
return 2;
}
public static int shortToLittleEndianByteArray(byte[] bytes, int offset, int value) {
bytes[offset] = (byte)value;
bytes[offset+1] = (byte)(value >> 8);
return 2;
}
public static byte[] mediumToByteArray(int value) {
byte[] bytes = new byte[3];
mediumToByteArray(bytes, 0, value);
return bytes;
}
public static int mediumToByteArray(byte[] bytes, int offset, int value) {
bytes[offset + 2] = (byte)value;
bytes[offset + 1] = (byte)(value >> 8);
bytes[offset] = (byte)(value >> 16);
return 3;
}
public static byte[] intToByteArray(int value) {
byte[] bytes = new byte[4];
intToByteArray(bytes, 0, value);
return bytes;
}
public static int intToByteArray(byte[] bytes, int offset, int value) {
bytes[offset + 3] = (byte)value;
bytes[offset + 2] = (byte)(value >> 8);
bytes[offset + 1] = (byte)(value >> 16);
bytes[offset] = (byte)(value >> 24);
return 4;
}
public static int intToLittleEndianByteArray(byte[] bytes, int offset, int value) {
bytes[offset] = (byte)value;
bytes[offset+1] = (byte)(value >> 8);
bytes[offset+2] = (byte)(value >> 16);
bytes[offset+3] = (byte)(value >> 24);
return 4;
}
public static byte[] longToByteArray(long l) {
byte[] bytes = new byte[8];
longToByteArray(bytes, 0, l);
return bytes;
}
public static int longToByteArray(byte[] bytes, int offset, long value) {
bytes[offset + 7] = (byte)value;
bytes[offset + 6] = (byte)(value >> 8);
bytes[offset + 5] = (byte)(value >> 16);
bytes[offset + 4] = (byte)(value >> 24);
bytes[offset + 3] = (byte)(value >> 32);
bytes[offset + 2] = (byte)(value >> 40);
bytes[offset + 1] = (byte)(value >> 48);
bytes[offset] = (byte)(value >> 56);
return 8;
}
public static int longTo4ByteArray(byte[] bytes, int offset, long value) {
bytes[offset + 3] = (byte)value;
bytes[offset + 2] = (byte)(value >> 8);
bytes[offset + 1] = (byte)(value >> 16);
bytes[offset + 0] = (byte)(value >> 24);
return 4;
}
public static int byteArrayToShort(byte[] bytes) {
return byteArrayToShort(bytes, 0);
}
public static int byteArrayToShort(byte[] bytes, int offset) {
return
(bytes[offset] & 0xff) << 8 | (bytes[offset + 1] & 0xff);
}
// The SSL patented 3-byte Value.
public static int byteArrayToMedium(byte[] bytes, int offset) {
return
(bytes[offset] & 0xff) << 16 |
(bytes[offset + 1] & 0xff) << 8 |
(bytes[offset + 2] & 0xff);
}
public static int byteArrayToInt(byte[] bytes) {
return byteArrayToInt(bytes, 0);
}
public static int byteArrayToInt(byte[] bytes, int offset) {
return
(bytes[offset] & 0xff) << 24 |
(bytes[offset + 1] & 0xff) << 16 |
(bytes[offset + 2] & 0xff) << 8 |
(bytes[offset + 3] & 0xff);
}
public static int byteArrayToIntLittleEndian(byte[] bytes, int offset) {
return
(bytes[offset + 3] & 0xff) << 24 |
(bytes[offset + 2] & 0xff) << 16 |
(bytes[offset + 1] & 0xff) << 8 |
(bytes[offset] & 0xff);
}
public static long byteArrayToLong(byte[] bytes) {
return byteArrayToLong(bytes, 0);
}
public static long byteArray4ToLong(byte[] bytes, int offset) {
return
((bytes[offset + 0] & 0xffL) << 24) |
((bytes[offset + 1] & 0xffL) << 16) |
((bytes[offset + 2] & 0xffL) << 8) |
((bytes[offset + 3] & 0xffL));
}
public static long byteArrayToLong(byte[] bytes, int offset) {
return
((bytes[offset] & 0xffL) << 56) |
((bytes[offset + 1] & 0xffL) << 48) |
((bytes[offset + 2] & 0xffL) << 40) |
((bytes[offset + 3] & 0xffL) << 32) |
((bytes[offset + 4] & 0xffL) << 24) |
((bytes[offset + 5] & 0xffL) << 16) |
((bytes[offset + 6] & 0xffL) << 8) |
((bytes[offset + 7] & 0xffL));
}
}