mirror of
https://github.com/ryujinx-mirror/ryujinx.git
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216 lines
7.8 KiB
C#
216 lines
7.8 KiB
C#
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using System;
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using System.IO;
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using System.IO.Compression;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
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{
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/// <summary>
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/// Binary data serializer.
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/// </summary>
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struct BinarySerializer
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{
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private readonly Stream _stream;
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private Stream _activeStream;
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/// <summary>
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/// Creates a new binary serializer.
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/// </summary>
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/// <param name="stream">Stream to read from or write into</param>
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public BinarySerializer(Stream stream)
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{
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_stream = stream;
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_activeStream = stream;
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}
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/// <summary>
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/// Reads data from the stream.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="data">Data read</param>
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public void Read<T>(ref T data) where T : unmanaged
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{
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Span<byte> buffer = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateSpan(ref data, 1));
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for (int offset = 0; offset < buffer.Length;)
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{
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offset += _activeStream.Read(buffer.Slice(offset));
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}
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}
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/// <summary>
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/// Tries to read data from the stream.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="data">Data read</param>
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/// <returns>True if the read was successful, false otherwise</returns>
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public bool TryRead<T>(ref T data) where T : unmanaged
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{
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// Length is unknown on compressed streams.
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if (_activeStream == _stream)
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{
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int size = Unsafe.SizeOf<T>();
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if (_activeStream.Length - _activeStream.Position < size)
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{
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return false;
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}
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}
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Read(ref data);
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return true;
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}
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/// <summary>
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/// Reads data prefixed with a magic and size from the stream.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="data">Data read</param>
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/// <param name="magic">Expected magic value, for validation</param>
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public void ReadWithMagicAndSize<T>(ref T data, uint magic) where T : unmanaged
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{
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uint actualMagic = 0;
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int size = 0;
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Read(ref actualMagic);
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Read(ref size);
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if (actualMagic != magic)
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{
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throw new DiskCacheLoadException(DiskCacheLoadResult.FileCorruptedInvalidMagic);
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}
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// Structs are expected to expand but not shrink between versions.
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if (size > Unsafe.SizeOf<T>())
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{
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throw new DiskCacheLoadException(DiskCacheLoadResult.FileCorruptedInvalidLength);
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}
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Span<byte> buffer = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateSpan(ref data, 1)).Slice(0, size);
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for (int offset = 0; offset < buffer.Length;)
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{
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offset += _activeStream.Read(buffer.Slice(offset));
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}
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}
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/// <summary>
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/// Writes data into the stream.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="data">Data to be written</param>
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public void Write<T>(ref T data) where T : unmanaged
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{
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Span<byte> buffer = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateSpan(ref data, 1));
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_activeStream.Write(buffer);
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}
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/// <summary>
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/// Writes data prefixed with a magic and size into the stream.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="data">Data to write</param>
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/// <param name="magic">Magic value to write</param>
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public void WriteWithMagicAndSize<T>(ref T data, uint magic) where T : unmanaged
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{
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int size = Unsafe.SizeOf<T>();
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Write(ref magic);
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Write(ref size);
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Span<byte> buffer = MemoryMarshal.Cast<T, byte>(MemoryMarshal.CreateSpan(ref data, 1));
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_activeStream.Write(buffer);
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}
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/// <summary>
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/// Indicates that all data that will be read from the stream has been compressed.
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/// </summary>
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public void BeginCompression()
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{
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CompressionAlgorithm algorithm = CompressionAlgorithm.None;
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Read(ref algorithm);
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if (algorithm == CompressionAlgorithm.Deflate)
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{
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_activeStream = new DeflateStream(_stream, CompressionMode.Decompress, true);
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}
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}
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/// <summary>
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/// Indicates that all data that will be written into the stream should be compressed.
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/// </summary>
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/// <param name="algorithm">Compression algorithm that should be used</param>
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public void BeginCompression(CompressionAlgorithm algorithm)
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{
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Write(ref algorithm);
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if (algorithm == CompressionAlgorithm.Deflate)
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{
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_activeStream = new DeflateStream(_stream, CompressionLevel.SmallestSize, true);
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}
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}
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/// <summary>
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/// Indicates the end of a compressed chunck.
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/// </summary>
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/// <remarks>
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/// Any data written after this will not be compressed unless <see cref="BeginCompression(CompressionAlgorithm)"/> is called again.
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/// Any data read after this will be assumed to be uncompressed unless <see cref="BeginCompression"/> is called again.
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/// </remarks>
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public void EndCompression()
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{
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if (_activeStream != _stream)
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{
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_activeStream.Dispose();
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_activeStream = _stream;
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}
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}
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/// <summary>
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/// Reads compressed data from the stream.
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/// </summary>
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/// <remarks>
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/// <paramref name="data"/> must have the exact length of the uncompressed data,
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/// otherwise decompression will fail.
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/// </remarks>
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/// <param name="stream">Stream to read from</param>
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/// <param name="data">Buffer to write the uncompressed data into</param>
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public static void ReadCompressed(Stream stream, Span<byte> data)
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{
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CompressionAlgorithm algorithm = (CompressionAlgorithm)stream.ReadByte();
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switch (algorithm)
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{
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case CompressionAlgorithm.None:
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stream.Read(data);
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break;
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case CompressionAlgorithm.Deflate:
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stream = new DeflateStream(stream, CompressionMode.Decompress, true);
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for (int offset = 0; offset < data.Length;)
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{
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offset += stream.Read(data.Slice(offset));
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}
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stream.Dispose();
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break;
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}
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}
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/// <summary>
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/// Compresses and writes the compressed data into the stream.
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/// </summary>
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/// <param name="stream">Stream to write into</param>
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/// <param name="data">Data to compress</param>
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/// <param name="algorithm">Compression algorithm to be used</param>
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public static void WriteCompressed(Stream stream, ReadOnlySpan<byte> data, CompressionAlgorithm algorithm)
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{
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stream.WriteByte((byte)algorithm);
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switch (algorithm)
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{
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case CompressionAlgorithm.None:
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stream.Write(data);
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break;
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case CompressionAlgorithm.Deflate:
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stream = new DeflateStream(stream, CompressionLevel.SmallestSize, true);
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stream.Write(data);
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stream.Dispose();
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break;
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}
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}
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}
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}
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