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//========================================================================
//Copyright 2007-2010 David Yu [email protected]
//------------------------------------------------------------------------
//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 com.dyuproject.protostuff;

/**
 * Int32/Int64 serialization
 *
 * @author David Yu
 * @created Sep 20, 2010
 */
public final class IntSerializer
{
    
    private IntSerializer() {}
    
    /**
     * Writes the 16-bit int into the buffer starting with the most significant byte.
     */
    public static void writeInt16(final int value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)((value >>>  8) & 0xFF);
        buffer[offset] = (byte)value;
    }
    
    /**
     * Writes the 16-bit int into the buffer starting with the least significant byte.
     */
    public static void writeInt16LE(final int value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)value;
        buffer[offset] = (byte)((value >>>  8) & 0xFF);
    }
    
    /**
     * Writes the 32-bit int into the buffer starting with the most significant byte.
     */
    public static void writeInt32(final int value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)((value >>> 24) & 0xFF);
        buffer[offset++] = (byte)((value >>> 16) & 0xFF);
        buffer[offset++] = (byte)((value >>>  8) & 0xFF);
        buffer[offset] = (byte)((value >>>  0) & 0xFF);
    }
    
    /**
     * Writes the 32-bit int into the buffer starting with the least significant byte.
     */
    public static void writeInt32LE(final int value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)((value >>>  0) & 0xFF);
        buffer[offset++] = (byte)((value >>>  8) & 0xFF);
        buffer[offset++] = (byte)((value >>> 16) & 0xFF);
        buffer[offset] = (byte)((value >>> 24) & 0xFF);
    }
    
    /**
     * Writes the 64-bit int into the buffer starting with the most significant byte.
     */
    public static void writeInt64(final long value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)(value >>> 56);
        buffer[offset++] = (byte)(value >>> 48);
        buffer[offset++] = (byte)(value >>> 40);
        buffer[offset++] = (byte)(value >>> 32);
        buffer[offset++] = (byte)(value >>> 24);
        buffer[offset++] = (byte)(value >>> 16);
        buffer[offset++] = (byte)(value >>>  8);
        buffer[offset] = (byte)(value >>>  0);
    }
    
    /**
     * Writes the 64-bit int into the buffer starting with the least significant byte.
     */
    public static void writeInt64LE(final long value, final byte[] buffer, int offset)
    {
        buffer[offset++] = (byte)(value >>>  0);
        buffer[offset++] = (byte)(value >>>  8);
        buffer[offset++] = (byte)(value >>> 16);
        buffer[offset++] = (byte)(value >>> 24);
        buffer[offset++] = (byte)(value >>> 32);
        buffer[offset++] = (byte)(value >>> 40);
        buffer[offset++] = (byte)(value >>> 48);
        buffer[offset] = (byte)(value >>> 56);
    }

}