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ReaderLittleEndian.cs
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ReaderLittleEndian.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Buffers.Binary
{
public static partial class BinaryPrimitives
{
/// <summary>
/// Reads a <see cref="double" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span to read.</param>
/// <returns>The little endian value.</returns>
/// <remarks>Reads exactly 8 bytes from the beginning of the span.</remarks>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="source"/> is too small to contain a <see cref="double" />.
/// </exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static double ReadDoubleLittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
BitConverter.Int64BitsToDouble(ReverseEndianness(MemoryMarshal.Read<long>(source))) :
MemoryMarshal.Read<double>(source);
}
/// <summary>
/// Reads a <see cref="Half" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span to read.</param>
/// <returns>The little endian value.</returns>
/// <remarks>Reads exactly 2 bytes from the beginning of the span.</remarks>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="source"/> is too small to contain a <see cref="Half" />.
/// </exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Half ReadHalfLittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
BitConverter.Int16BitsToHalf(ReverseEndianness(MemoryMarshal.Read<short>(source))) :
MemoryMarshal.Read<Half>(source);
}
/// <summary>
/// Reads an Int16 out of a read-only span of bytes as little endian.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static short ReadInt16LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<short>(source)) :
MemoryMarshal.Read<short>(source);
}
/// <summary>
/// Reads an Int32 out of a read-only span of bytes as little endian.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int ReadInt32LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<int>(source)) :
MemoryMarshal.Read<int>(source);
}
/// <summary>
/// Reads an Int64 out of a read-only span of bytes as little endian.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static long ReadInt64LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<long>(source)) :
MemoryMarshal.Read<long>(source);
}
/// <summary>
/// Reads a <see cref="float" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span to read.</param>
/// <returns>The little endian value.</returns>
/// <remarks>Reads exactly 4 bytes from the beginning of the span.</remarks>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="source"/> is too small to contain a <see cref="float" />.
/// </exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static float ReadSingleLittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
BitConverter.Int32BitsToSingle(ReverseEndianness(MemoryMarshal.Read<int>(source))) :
MemoryMarshal.Read<float>(source);
}
/// <summary>
/// Reads a UInt16 out of a read-only span of bytes as little endian.
/// </summary>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ushort ReadUInt16LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<ushort>(source)) :
MemoryMarshal.Read<ushort>(source);
}
/// <summary>
/// Reads a UInt32 out of a read-only span of bytes as little endian.
/// </summary>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static uint ReadUInt32LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<uint>(source)) :
MemoryMarshal.Read<uint>(source);
}
/// <summary>
/// Reads a UInt64 out of a read-only span of bytes as little endian.
/// </summary>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ulong ReadUInt64LittleEndian(ReadOnlySpan<byte> source)
{
return !BitConverter.IsLittleEndian ?
ReverseEndianness(MemoryMarshal.Read<ulong>(source)) :
MemoryMarshal.Read<ulong>(source);
}
/// <summary>
/// Reads a <see cref="double" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span of bytes to read.</param>
/// <param name="value">When this method returns, the value read out of the read-only span of bytes, as little endian.</param>
/// <returns>
/// <see langword="true" /> if the span is large enough to contain a <see cref="double" />; otherwise, <see langword="false" />.
/// </returns>
/// <remarks>Reads exactly 8 bytes from the beginning of the span.</remarks>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadDoubleLittleEndian(ReadOnlySpan<byte> source, out double value)
{
if (!BitConverter.IsLittleEndian)
{
bool success = MemoryMarshal.TryRead(source, out long tmp);
value = BitConverter.Int64BitsToDouble(ReverseEndianness(tmp));
return success;
}
return MemoryMarshal.TryRead(source, out value);
}
/// <summary>
/// Reads a <see cref="Half" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span of bytes to read.</param>
/// <param name="value">When this method returns, the value read out of the read-only span of bytes, as little endian.</param>
/// <returns>
/// <see langword="true" /> if the span is large enough to contain a <see cref="Half" />; otherwise, <see langword="false" />.
/// </returns>
/// <remarks>Reads exactly 2 bytes from the beginning of the span.</remarks>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadHalfLittleEndian(ReadOnlySpan<byte> source, out Half value)
{
if (!BitConverter.IsLittleEndian)
{
bool success = MemoryMarshal.TryRead(source, out short tmp);
value = BitConverter.Int16BitsToHalf(ReverseEndianness(tmp));
return success;
}
return MemoryMarshal.TryRead(source, out value);
}
/// <summary>
/// Reads an Int16 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain an Int16, return false.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadInt16LittleEndian(ReadOnlySpan<byte> source, out short value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out short tmp);
value = ReverseEndianness(tmp);
return success;
}
/// <summary>
/// Reads an Int32 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain an Int32, return false.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadInt32LittleEndian(ReadOnlySpan<byte> source, out int value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out int tmp);
value = ReverseEndianness(tmp);
return success;
}
/// <summary>
/// Reads an Int64 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain an Int64, return false.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadInt64LittleEndian(ReadOnlySpan<byte> source, out long value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out long tmp);
value = ReverseEndianness(tmp);
return success;
}
/// <summary>
/// Reads a <see cref="float" /> from the beginning of a read-only span of bytes, as little endian.
/// </summary>
/// <param name="source">The read-only span of bytes to read.</param>
/// <param name="value">When this method returns, the value read out of the read-only span of bytes, as little endian.</param>
/// <returns>
/// <see langword="true" /> if the span is large enough to contain a <see cref="float" />; otherwise, <see langword="false" />.
/// </returns>
/// <remarks>Reads exactly 4 bytes from the beginning of the span.</remarks>
public static bool TryReadSingleLittleEndian(ReadOnlySpan<byte> source, out float value)
{
if (!BitConverter.IsLittleEndian)
{
bool success = MemoryMarshal.TryRead(source, out int tmp);
value = BitConverter.Int32BitsToSingle(ReverseEndianness(tmp));
return success;
}
return MemoryMarshal.TryRead(source, out value);
}
/// <summary>
/// Reads a UInt16 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain a UInt16, return false.</returns>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadUInt16LittleEndian(ReadOnlySpan<byte> source, out ushort value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out ushort tmp);
value = ReverseEndianness(tmp);
return success;
}
/// <summary>
/// Reads a UInt32 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain a UInt32, return false.</returns>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadUInt32LittleEndian(ReadOnlySpan<byte> source, out uint value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out uint tmp);
value = ReverseEndianness(tmp);
return success;
}
/// <summary>
/// Reads a UInt64 out of a read-only span of bytes as little endian.
/// </summary>
/// <returns>If the span is too small to contain a UInt64, return false.</returns>
[CLSCompliant(false)]
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool TryReadUInt64LittleEndian(ReadOnlySpan<byte> source, out ulong value)
{
if (BitConverter.IsLittleEndian)
{
return MemoryMarshal.TryRead(source, out value);
}
bool success = MemoryMarshal.TryRead(source, out ulong tmp);
value = ReverseEndianness(tmp);
return success;
}
}
}