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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.
// See the LICENSE file in the project root for more information.
using System;
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis.Shared.Utilities;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis.Host;
internal sealed partial class TemporaryStorageService
{
private unsafe class DirectMemoryAccessStreamReader : TextReaderWithLength
{
private char* _position;
private readonly char* _end;
public DirectMemoryAccessStreamReader(char* src, int length)
: base(length)
{
RoslynDebug.Assert(src != null);
RoslynDebug.Assert(length >= 0);
_position = src;
_end = _position + length;
}
public override int Peek()
{
if (_position >= _end)
{
return -1;
}
return *_position;
}
public override int Read()
{
if (_position >= _end)
{
return -1;
}
return *_position++;
}
public override int Read(char[] buffer, int index, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (index < 0 || index >= buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
if (count < 0 || (index + count) > buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
count = Math.Min(count, (int)(_end - _position));
if (count > 0)
{
Marshal.Copy((IntPtr)_position, buffer, index, count);
_position += count;
}
return count;
}
}
}
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