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ByteEncoder.cs
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213 lines (199 loc) · 7.07 KB
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// Copyright 2006 - 2008: Rory Plaire (codekaizen@gmail.com)
//
// This file is part of SharpMap.
// SharpMap 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 2 of the License, or
// (at your option) any later version.
//
// SharpMap 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 SharpMap; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
namespace SharpMap.Utilities
{
public static class ByteEncoder
{
#region Endian conversion helper routines
/// <summary>
/// Returns the value encoded in Big Endian (PPC, XDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Big-endian encoded value</returns>
public static Int32 GetBigEndian(Int32 value)
{
if (BitConverter.IsLittleEndian)
{
return swapByteOrder(value);
}
else
{
return value;
}
}
/// <summary>
/// Returns the value encoded in Big Endian (PPC, XDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Big-endian encoded value</returns>
public static UInt16 GetBigEndian(UInt16 value)
{
if (BitConverter.IsLittleEndian)
{
return swapByteOrder(value);
}
else
{
return value;
}
}
/// <summary>
/// Returns the value encoded in Big Endian (PPC, XDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Big-endian encoded value</returns>
public static UInt32 GetBigEndian(UInt32 value)
{
if (BitConverter.IsLittleEndian)
{
return swapByteOrder(value);
}
else
{
return value;
}
}
/// <summary>
/// Returns the value encoded in Big Endian (PPC, XDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Big-endian encoded value</returns>
public static Double GetBigEndian(Double value)
{
if (BitConverter.IsLittleEndian)
{
return swapByteOrder(value);
}
else
{
return value;
}
}
/// <summary>
/// Returns the value encoded in Little Endian (x86, NDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Little-endian encoded value</returns>
public static Int32 GetLittleEndian(Int32 value)
{
if (BitConverter.IsLittleEndian)
{
return value;
}
else
{
return swapByteOrder(value);
}
}
/// <summary>
/// Returns the value encoded in Little Endian (x86, NDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Little-endian encoded value</returns>
public static UInt32 GetLittleEndian(UInt32 value)
{
if (BitConverter.IsLittleEndian)
{
return value;
}
else
{
return swapByteOrder(value);
}
}
/// <summary>
/// Returns the value encoded in Little Endian (x86, NDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Little-endian encoded value</returns>
public static UInt16 GetLittleEndian(UInt16 value)
{
if (BitConverter.IsLittleEndian)
{
return value;
}
else
{
return swapByteOrder(value);
}
}
/// <summary>
/// Returns the value encoded in Little Endian (x86, NDR) format
/// </summary>
/// <param name="value">Value to encode</param>
/// <returns>Little-endian encoded value</returns>
public static Double GetLittleEndian(Double value)
{
if (BitConverter.IsLittleEndian)
{
return value;
}
else
{
return swapByteOrder(value);
}
}
/// <summary>
/// Swaps the Byte order of an Int32.
/// </summary>
/// <param name="value">Int32 to to swap the bytes of.</param>
/// <returns>Byte Order swapped Int32.</returns>
private static Int32 swapByteOrder(Int32 value)
{
Int32 swapped = (Int32)((0x000000FF) & (value >> 24)
| (0x0000FF00) & (value >> 8)
| (0x00FF0000) & (value << 8)
| (0xFF000000) & (value << 24));
return swapped;
}
/// <summary>
/// Swaps the Byte order of a UInt16.
/// </summary>
/// <param name="value">UInt16 to swap the bytes of.</param>
/// <returns>Byte Order swapped UInt16.</returns>
private static UInt16 swapByteOrder(UInt16 value)
{
return (UInt16)((0x00FF & (value >> 8))
| (0xFF00 & (value << 8)));
}
/// <summary>
/// Swaps the Byte order of a UInt32.
/// </summary>
/// <param name="value">UInt32 to swap the bytes of.</param>
/// <returns>Byte Order swapped UInt32.</returns>
private static UInt32 swapByteOrder(UInt32 value)
{
UInt32 swapped = ((0x000000FF) & (value >> 24)
| (0x0000FF00) & (value >> 8)
| (0x00FF0000) & (value << 8)
| (0xFF000000) & (value << 24));
return swapped;
}
/// <summary>
/// Swaps the Byte order of a Double (Double precision IEEE 754)
/// </summary>
/// <param name="value">Double to swap</param>
/// <returns>Byte Order swapped Double</returns>
private static Double swapByteOrder(Double value)
{
Byte[] buffer = BitConverter.GetBytes(value);
Array.Reverse(buffer, 0, buffer.Length);
return BitConverter.ToDouble(buffer, 0);
}
#endregion
}
}