62 lines
2.3 KiB
C#
62 lines
2.3 KiB
C#
using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Threading;
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namespace Server
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{
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public static class NativeReader
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{
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private static readonly INativeReader m_NativeReader;
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static NativeReader() => m_NativeReader = Core.Unix ? new NativeReaderUnix() : new NativeReaderWin32();
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public static unsafe int Read(FileStream source, void* buffer, int length) => Read(source, buffer, 0, length);
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public static unsafe int Read(FileStream source, void* buffer, int bufferIndex, int length) =>
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m_NativeReader.Read(source, buffer, bufferIndex, length);
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}
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public interface INativeReader
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{
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unsafe int Read(FileStream source, void* buffer, int bufferIndex, int length);
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}
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public sealed class NativeReaderWin32 : INativeReader
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{
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internal class UnsafeNativeMethods
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{
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[DllImport("kernel32")]
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internal static extern unsafe bool ReadFile(IntPtr hFile, void* lpBuffer, uint nNumberOfBytesToRead, ref uint lpNumberOfBytesRead, NativeOverlapped* lpOverlapped);
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}
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public unsafe int Read(FileStream source, void* buffer, int bufferIndex, int length) => InternalRead(source, buffer, bufferIndex, length);
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internal static unsafe int InternalRead(FileStream source, void* buffer, int bufferIndex, int length)
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{
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var byteCount = 0U;
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if (UnsafeNativeMethods.ReadFile(source.SafeFileHandle!.DangerousGetHandle(), (byte*)buffer + bufferIndex, (uint)length, ref byteCount, null))
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{
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return (int)byteCount;
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}
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return -1;
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}
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}
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public sealed class NativeReaderUnix : INativeReader
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{
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internal class UnsafeNativeMethods
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{
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[DllImport("libc")]
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internal static extern unsafe int read(IntPtr ptr, void* buffer, int length);
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}
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public unsafe int Read(FileStream source, void* buffer, int bufferIndex, int length) =>
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InternalRead(source, buffer, bufferIndex, length);
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internal unsafe int InternalRead(FileStream source, void* buffer, int bufferIndex, int length) =>
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UnsafeNativeMethods.read(source.SafeFileHandle.DangerousGetHandle(), (byte*)buffer + bufferIndex, length);
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}
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}
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