116 lines
3.5 KiB
C#
116 lines
3.5 KiB
C#
#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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namespace LC.Newtonsoft.Json.Utilities
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{
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/// <summary>
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/// Builds a string. Unlike <see cref="System.Text.StringBuilder"/> this class lets you reuse its internal buffer.
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/// </summary>
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internal struct StringBuffer
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{
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private char[] _buffer;
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private int _position;
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public int Position
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{
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get => _position;
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set => _position = value;
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}
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public bool IsEmpty => _buffer == null;
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public StringBuffer(IArrayPool<char> bufferPool, int initalSize) : this(BufferUtils.RentBuffer(bufferPool, initalSize))
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{
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}
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private StringBuffer(char[] buffer)
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{
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_buffer = buffer;
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_position = 0;
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}
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public void Append(IArrayPool<char> bufferPool, char value)
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{
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// test if the buffer array is large enough to take the value
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if (_position == _buffer.Length)
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{
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EnsureSize(bufferPool, 1);
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}
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// set value and increment poisition
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_buffer[_position++] = value;
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}
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public void Append(IArrayPool<char> bufferPool, char[] buffer, int startIndex, int count)
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{
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if (_position + count >= _buffer.Length)
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{
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EnsureSize(bufferPool, count);
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}
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Array.Copy(buffer, startIndex, _buffer, _position, count);
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_position += count;
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}
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public void Clear(IArrayPool<char> bufferPool)
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{
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if (_buffer != null)
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{
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BufferUtils.ReturnBuffer(bufferPool, _buffer);
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_buffer = null;
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}
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_position = 0;
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}
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private void EnsureSize(IArrayPool<char> bufferPool, int appendLength)
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{
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char[] newBuffer = BufferUtils.RentBuffer(bufferPool, (_position + appendLength) * 2);
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if (_buffer != null)
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{
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Array.Copy(_buffer, newBuffer, _position);
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BufferUtils.ReturnBuffer(bufferPool, _buffer);
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}
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_buffer = newBuffer;
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}
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public override string ToString()
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{
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return ToString(0, _position);
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}
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public string ToString(int start, int length)
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{
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// TODO: validation
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return new string(_buffer, start, length);
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}
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public char[] InternalBuffer => _buffer;
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}
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} |