1
0
Fork 0
mirror of https://github.com/Ryujinx/Ryujinx.git synced 2024-12-25 00:16:03 +00:00
Ryujinx/Ryujinx.Common/Extensions/StreamExtensions.cs
jhorv 5131b71437
Reducing memory allocations (#4537)
* add RecyclableMemoryStream dependency and MemoryStreamManager

* organize BinaryReader/BinaryWriter extensions

* add StreamExtensions to reduce need for BinaryWriter

* simple replacments of MemoryStream with RecyclableMemoryStream

* add write ReadOnlySequence<byte> support to IVirtualMemoryManager

* avoid 0-length array creation

* rework IpcMessage and related types to greatly reduce memory allocation by using RecylableMemoryStream, keeping streams around longer, avoiding their creation when possible, and avoiding creation of BinaryReader and BinaryWriter when possible

* reduce LINQ-induced memory allocations with custom methods to query KPriorityQueue

* use RecyclableMemoryStream in StreamUtils, and use StreamUtils in EmbeddedResources

* add constants for nanosecond/millisecond conversions

* code formatting

* XML doc adjustments

* fix: StreamExtension.WriteByte not writing non-zero values for lengths <= 16

* XML Doc improvements. Implement StreamExtensions.WriteByte() block writes for large-enough count values.

* add copyless path for StreamExtension.Write(ReadOnlySpan<int>)

* add default implementation of IVirtualMemoryManager.Write(ulong, ReadOnlySequence<byte>); remove previous explicit implementations

* code style fixes

* remove LINQ completely from KScheduler/KPriorityQueue by implementing a custom struct-based enumerator
2023-03-17 13:14:50 +01:00

138 lines
5 KiB
C#

using System;
using System.Buffers.Binary;
using System.IO;
using System.Runtime.InteropServices;
namespace Ryujinx.Common
{
public static class StreamExtensions
{
/// <summary>
/// Writes a <cref="ReadOnlySpan<int>" /> to this stream.
///
/// This default implementation converts each buffer value to a stack-allocated
/// byte array, then writes it to the Stream using <cref="System.Stream.Write(byte[])" />.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="buffer">The buffer of values to be written</param>
public static void Write(this Stream stream, ReadOnlySpan<int> buffer)
{
if (buffer.Length == 0)
{
return;
}
if (BitConverter.IsLittleEndian)
{
ReadOnlySpan<byte> byteBuffer = MemoryMarshal.Cast<int, byte>(buffer);
stream.Write(byteBuffer);
}
else
{
Span<byte> byteBuffer = stackalloc byte[sizeof(int)];
foreach (int value in buffer)
{
BinaryPrimitives.WriteInt32LittleEndian(byteBuffer, value);
stream.Write(byteBuffer);
}
}
}
/// <summary>
/// Writes a four-byte signed integer to this stream. The current position
/// of the stream is advanced by four.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="value">The value to be written</param>
public static void Write(this Stream stream, int value)
{
Span<byte> buffer = stackalloc byte[sizeof(int)];
BinaryPrimitives.WriteInt32LittleEndian(buffer, value);
stream.Write(buffer);
}
/// <summary>
/// Writes an eight-byte signed integer to this stream. The current position
/// of the stream is advanced by eight.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="value">The value to be written</param>
public static void Write(this Stream stream, long value)
{
Span<byte> buffer = stackalloc byte[sizeof(long)];
BinaryPrimitives.WriteInt64LittleEndian(buffer, value);
stream.Write(buffer);
}
/// <summary>
// Writes a four-byte unsigned integer to this stream. The current position
// of the stream is advanced by four.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="value">The value to be written</param>
public static void Write(this Stream stream, uint value)
{
Span<byte> buffer = stackalloc byte[sizeof(uint)];
BinaryPrimitives.WriteUInt32LittleEndian(buffer, value);
stream.Write(buffer);
}
/// <summary>
/// Writes an eight-byte unsigned integer to this stream. The current
/// position of the stream is advanced by eight.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="value">The value to be written</param>
public static void Write(this Stream stream, ulong value)
{
Span<byte> buffer = stackalloc byte[sizeof(ulong)];
BinaryPrimitives.WriteUInt64LittleEndian(buffer, value);
stream.Write(buffer);
}
/// <summary>
/// Writes the contents of source to stream by calling source.CopyTo(stream).
/// Provides consistency with other Stream.Write methods.
/// </summary>
/// <param name="stream">The stream to be written to</param>
/// <param name="source">The stream to be read from</param>
public static void Write(this Stream stream, Stream source)
{
source.CopyTo(stream);
}
/// <summary>
/// Writes a sequence of bytes to the Stream.
/// </summary>
/// <param name="stream">The stream to be written to.</param>
/// <param name="value">The byte to be written</param>
/// <param name="count">The number of times the value should be written</param>
public static void WriteByte(this Stream stream, byte value, int count)
{
if (count <= 0)
{
return;
}
const int BlockSize = 16;
int blockCount = count / BlockSize;
if (blockCount > 0)
{
Span<byte> span = stackalloc byte[BlockSize];
span.Fill(value);
for (int x = 0; x < blockCount; x++)
{
stream.Write(span);
}
}
int nonBlockBytes = count % BlockSize;
for (int x = 0; x < nonBlockBytes; x++)
{
stream.WriteByte(value);
}
}
}
}