mirror of
https://github.com/jellyfin/jellyfin.git
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239 lines
5.7 KiB
C#
239 lines
5.7 KiB
C#
//
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// Mono.Security.BitConverterLE.cs
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// Like System.BitConverter but always little endian
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//
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// Author:
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// Bernie Solomon
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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namespace MediaBrowser.Server.Mono.Security
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{
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internal sealed class BitConverterLE
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{
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private BitConverterLE ()
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{
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}
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unsafe private static byte[] GetUShortBytes (byte *bytes)
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{
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if (BitConverter.IsLittleEndian)
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return new byte [] { bytes [0], bytes [1] };
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else
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return new byte [] { bytes [1], bytes [0] };
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}
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unsafe private static byte[] GetUIntBytes (byte *bytes)
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{
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if (BitConverter.IsLittleEndian)
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return new byte [] { bytes [0], bytes [1], bytes [2], bytes [3] };
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else
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return new byte [] { bytes [3], bytes [2], bytes [1], bytes [0] };
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}
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unsafe private static byte[] GetULongBytes (byte *bytes)
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{
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if (BitConverter.IsLittleEndian)
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return new byte [] { bytes [0], bytes [1], bytes [2], bytes [3],
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bytes [4], bytes [5], bytes [6], bytes [7] };
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else
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return new byte [] { bytes [7], bytes [6], bytes [5], bytes [4],
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bytes [3], bytes [2], bytes [1], bytes [0] };
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}
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unsafe internal static byte[] GetBytes (bool value)
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{
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return new byte [] { value ? (byte)1 : (byte)0 };
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}
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unsafe internal static byte[] GetBytes (char value)
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{
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return GetUShortBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (short value)
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{
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return GetUShortBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (int value)
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{
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return GetUIntBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (long value)
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{
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return GetULongBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (ushort value)
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{
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return GetUShortBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (uint value)
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{
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return GetUIntBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (ulong value)
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{
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return GetULongBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (float value)
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{
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return GetUIntBytes ((byte *) &value);
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}
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unsafe internal static byte[] GetBytes (double value)
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{
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return GetULongBytes ((byte *) &value);
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}
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unsafe private static void UShortFromBytes (byte *dst, byte[] src, int startIndex)
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{
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if (BitConverter.IsLittleEndian) {
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dst [0] = src [startIndex];
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dst [1] = src [startIndex + 1];
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} else {
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dst [0] = src [startIndex + 1];
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dst [1] = src [startIndex];
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}
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}
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unsafe private static void UIntFromBytes (byte *dst, byte[] src, int startIndex)
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{
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if (BitConverter.IsLittleEndian) {
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dst [0] = src [startIndex];
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dst [1] = src [startIndex + 1];
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dst [2] = src [startIndex + 2];
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dst [3] = src [startIndex + 3];
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} else {
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dst [0] = src [startIndex + 3];
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dst [1] = src [startIndex + 2];
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dst [2] = src [startIndex + 1];
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dst [3] = src [startIndex];
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}
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}
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unsafe private static void ULongFromBytes (byte *dst, byte[] src, int startIndex)
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{
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if (BitConverter.IsLittleEndian) {
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for (int i = 0; i < 8; ++i)
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dst [i] = src [startIndex + i];
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} else {
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for (int i = 0; i < 8; ++i)
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dst [i] = src [startIndex + (7 - i)];
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}
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}
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unsafe internal static bool ToBoolean (byte[] value, int startIndex)
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{
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return value [startIndex] != 0;
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}
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unsafe internal static char ToChar (byte[] value, int startIndex)
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{
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char ret;
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UShortFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static short ToInt16 (byte[] value, int startIndex)
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{
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short ret;
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UShortFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static int ToInt32 (byte[] value, int startIndex)
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{
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int ret;
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UIntFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static long ToInt64 (byte[] value, int startIndex)
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{
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long ret;
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ULongFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static ushort ToUInt16 (byte[] value, int startIndex)
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{
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ushort ret;
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UShortFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static uint ToUInt32 (byte[] value, int startIndex)
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{
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uint ret;
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UIntFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static ulong ToUInt64 (byte[] value, int startIndex)
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{
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ulong ret;
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ULongFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static float ToSingle (byte[] value, int startIndex)
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{
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float ret;
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UIntFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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unsafe internal static double ToDouble (byte[] value, int startIndex)
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{
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double ret;
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ULongFromBytes ((byte *) &ret, value, startIndex);
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return ret;
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}
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}
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}
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