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using System;
namespace ExifLibrary
{
/// <summary>
/// An endian-aware converter for converting between base data types
/// and an array of bytes.
/// </summary>
public class BitConverterEx
{
#region Public Enums
/// <summary>
/// Represents the byte order.
/// </summary>
public enum ByteOrder
{
LittleEndian = 1,
BigEndian = 2,
}
#endregion
#region Member Variables
private ByteOrder mFrom, mTo;
#endregion
#region Constructors
public BitConverterEx(ByteOrder from, ByteOrder to)
{
mFrom = from;
mTo = to;
}
#endregion
#region Properties
/// <summary>
/// Indicates the byte order in which data is stored in this platform.
/// </summary>
public static ByteOrder SystemByteOrder
{
get
{
return (BitConverter.IsLittleEndian ? ByteOrder.LittleEndian : ByteOrder.BigEndian);
}
}
#endregion
#region Predefined Values
/// <summary>
/// Returns a bit converter that converts between little-endian and system byte-order.
/// </summary>
public static BitConverterEx LittleEndian
{
get
{
return new BitConverterEx(ByteOrder.LittleEndian, BitConverterEx.SystemByteOrder);
}
}
/// <summary>
/// Returns a bit converter that converts between big-endian and system byte-order.
/// </summary>
public static BitConverterEx BigEndian
{
get
{
return new BitConverterEx(ByteOrder.BigEndian, BitConverterEx.SystemByteOrder);
}
}
/// <summary>
/// Returns a bit converter that does not do any byte-order conversion.
/// </summary>
public static BitConverterEx SystemEndian
{
get
{
return new BitConverterEx(BitConverterEx.SystemByteOrder, BitConverterEx.SystemByteOrder);
}
}
#endregion
#region Static Methods
/// <summary>
/// Converts the given array of bytes to a Unicode character.
/// </summary>
public static char ToChar(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 2, from, to);
return BitConverter.ToChar(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 16-bit unsigned integer.
/// </summary>
public static ushort ToUInt16(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 2, from, to);
return BitConverter.ToUInt16(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 32-bit unsigned integer.
/// </summary>
public static uint ToUInt32(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 4, from, to);
return BitConverter.ToUInt32(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 64-bit unsigned integer.
/// </summary>
public static ulong ToUInt64(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 8, from, to);
return BitConverter.ToUInt64(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 16-bit signed integer.
/// </summary>
public static short ToInt16(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 2, from, to);
return BitConverter.ToInt16(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 32-bit signed integer.
/// </summary>
public static int ToInt32(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 4, from, to);
return BitConverter.ToInt32(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a 64-bit signed integer.
/// </summary>
public static long ToInt64(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 8, from, to);
return BitConverter.ToInt64(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a single precision floating number.
/// </summary>
public static float ToSingle(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 4, from, to);
return BitConverter.ToSingle(data, 0);
}
/// <summary>
/// Converts the given array of bytes to a double precision floating number.
/// </summary>
public static double ToDouble(byte[] value, long startIndex, ByteOrder from, ByteOrder to)
{
byte[] data = CheckData(value, startIndex, 8, from, to);
return BitConverter.ToDouble(data, 0);
}
/// <summary>
/// Converts the given 16-bit unsigned integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(ushort value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given 32-bit unsigned integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(uint value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given 64-bit unsigned integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(ulong value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given 16-bit signed integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(short value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given 32-bit signed integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(int value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given 64-bit signed integer to an array of bytes.
/// </summary>
public static byte[] GetBytes(long value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given single precision floating-point number to an array of bytes.
/// </summary>
public static byte[] GetBytes(float value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
/// <summary>
/// Converts the given double precision floating-point number to an array of bytes.
/// </summary>
public static byte[] GetBytes(double value, ByteOrder from, ByteOrder to)
{
byte[] data = BitConverter.GetBytes(value);
data = CheckData(data, from, to);
return data;
}
#endregion
#region Instance Methods
/// <summary>
/// Converts the given array of bytes to a 16-bit unsigned integer.
/// </summary>
public char ToChar(byte[] value, long startIndex)
{
return BitConverterEx.ToChar(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 16-bit unsigned integer.
/// </summary>
public ushort ToUInt16(byte[] value, long startIndex)
{
return BitConverterEx.ToUInt16(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 32-bit unsigned integer.
/// </summary>
public uint ToUInt32(byte[] value, long startIndex)
{
return BitConverterEx.ToUInt32(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 64-bit unsigned integer.
/// </summary>
public ulong ToUInt64(byte[] value, long startIndex)
{
return BitConverterEx.ToUInt64(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 16-bit signed integer.
/// </summary>
public short ToInt16(byte[] value, long startIndex)
{
return BitConverterEx.ToInt16(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 32-bit signed integer.
/// </summary>
public int ToInt32(byte[] value, long startIndex)
{
return BitConverterEx.ToInt32(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a 64-bit signed integer.
/// </summary>
public long ToInt64(byte[] value, long startIndex)
{
return BitConverterEx.ToInt64(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a single precision floating number.
/// </summary>
public float ToSingle(byte[] value, long startIndex)
{
return BitConverterEx.ToSingle(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given array of bytes to a double precision floating number.
/// </summary>
public double ToDouble(byte[] value, long startIndex)
{
return BitConverterEx.ToDouble(value, startIndex, mFrom, mTo);
}
/// <summary>
/// Converts the given 16-bit unsigned integer to an array of bytes.
/// </summary>
public byte[] GetBytes(ushort value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given 32-bit unsigned integer to an array of bytes.
/// </summary>
public byte[] GetBytes(uint value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given 64-bit unsigned integer to an array of bytes.
/// </summary>
public byte[] GetBytes(ulong value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given 16-bit signed integer to an array of bytes.
/// </summary>
public byte[] GetBytes(short value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given 32-bit signed integer to an array of bytes.
/// </summary>
public byte[] GetBytes(int value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given 64-bit signed integer to an array of bytes.
/// </summary>
public byte[] GetBytes(long value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given single precision floating-point number to an array of bytes.
/// </summary>
public byte[] GetBytes(float value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
/// <summary>
/// Converts the given double precision floating-point number to an array of bytes.
/// </summary>
public byte[] GetBytes(double value)
{
return BitConverterEx.GetBytes(value, mFrom, mTo);
}
#endregion
#region Private Helpers
/// <summary>
/// Reverse the array of bytes as needed.
/// </summary>
private static byte[] CheckData(byte[] value, long startIndex, long length, ByteOrder from, ByteOrder to)
{
byte[] data = new byte[length];
Array.Copy(value, startIndex, data, 0, length);
if (from != to)
Array.Reverse(data);
return data;
}
/// <summary>
/// Reverse the array of bytes as needed.
/// </summary>
private static byte[] CheckData(byte[] value, ByteOrder from, ByteOrder to)
{
return CheckData(value, 0, value.Length, from, to);
}
#endregion
}
}
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