101 lines
2.9 KiB
C#
101 lines
2.9 KiB
C#
// Copyright (c) Wojciech Figat. All rights reserved.
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using System;
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using System.IO;
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namespace FlaxEngine.Json
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{
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/// <summary>
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/// Implements a <see cref="T:System.IO.TextReader" /> that reads from unmanaged UTF8 string buffer (provided as raw pointer and length).
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/// </summary>
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internal class UnmanagedStringReader : TextReader
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{
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private unsafe byte* _ptr;
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private int _pos;
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private int _length;
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/// <summary>
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/// Initializes a new instance of the <see cref="UnmanagedStringReader"/> class.
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/// </summary>
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public unsafe UnmanagedStringReader()
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{
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_ptr = null;
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_pos = 0;
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_length = 0;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="UnmanagedStringReader"/> class.
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/// </summary>
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/// <param name="buffer">The text buffer pointer (raw, fixed memory).</param>
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/// <param name="length">The text length (characters count).</param>
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public unsafe UnmanagedStringReader(IntPtr buffer, int length)
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{
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if (buffer == IntPtr.Zero)
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throw new ArgumentNullException(nameof(buffer));
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_ptr = (byte*)buffer.ToPointer();
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_pos = 0;
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_length = length;
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}
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/// <summary>
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/// Initializes the reader with the specified text buffer.
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/// </summary>
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/// <param name="buffer">The text buffer pointer (raw, fixed memory).</param>
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/// <param name="length">The text length (characters count).</param>
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public unsafe void Initialize(void* buffer, int length)
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{
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if (buffer == null)
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throw new ArgumentNullException(nameof(buffer));
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_ptr = (byte*)buffer;
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_pos = 0;
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_length = length;
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}
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/// <summary>
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/// Initializes the reader with the specified text buffer.
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/// </summary>
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/// <param name="buffer">The text buffer pointer (raw, fixed memory).</param>
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/// <param name="length">The text length (characters count).</param>
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public unsafe void Initialize(IntPtr buffer, int length)
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{
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if (buffer == IntPtr.Zero)
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throw new ArgumentNullException(nameof(buffer));
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_ptr = (byte*)buffer.ToPointer();
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_pos = 0;
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_length = length;
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}
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/// <inheritdoc />
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protected override unsafe void Dispose(bool disposing)
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{
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_ptr = null;
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_pos = 0;
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_length = 0;
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base.Dispose(disposing);
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}
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/// <inheritdoc />
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public override unsafe int Peek()
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{
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if (_pos == _length)
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return -1;
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return _ptr[_pos];
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}
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/// <inheritdoc />
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public override unsafe int Read()
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{
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if (_pos == _length)
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return -1;
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return _ptr[_pos++];
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}
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}
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}
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