Init TEngine4.0.0

Init TEngine4.0.0

UnityProject/Packages/YooAsset/Runtime/Utility/BufferWriter.cs

@@ -0,0 +1,187 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System.Diagnostics;
+using System.IO;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 数据存储以小端字节序为标准
+	/// </summary>
+	internal class BufferWriter
+	{
+		private readonly byte[] _buffer;
+		private int _index = 0;
+
+		public BufferWriter(int capacity)
+		{
+			_buffer = new byte[capacity];
+		}
+
+		/// <summary>
+		/// 缓冲区容量
+		/// </summary>
+		public int Capacity
+		{
+			get { return _buffer.Length; }
+		}
+
+		/// <summary>
+		/// 清空缓冲区
+		/// </summary>
+		public void Clear()
+		{
+			_index = 0;
+		}
+
+		/// <summary>
+		/// 将有效数据写入文件流
+		/// </summary>
+		public void WriteToStream(FileStream fileStream)
+		{
+			fileStream.Write(_buffer, 0, _index);
+		}
+
+		public void WriteBytes(byte[] data)
+		{
+			int count = data.Length;
+			CheckWriterIndex(count);
+			Buffer.BlockCopy(data, 0, _buffer, _index, count);
+			_index += count;
+		}
+		public void WriteByte(byte value)
+		{
+			CheckWriterIndex(1);
+			_buffer[_index++] = value;
+		}
+
+		public void WriteBool(bool value)
+		{
+			WriteByte((byte)(value ? 1 : 0));
+		}
+		public void WriteInt16(short value)
+		{
+			WriteUInt16((ushort)value);
+		}
+		public void WriteUInt16(ushort value)
+		{
+			CheckWriterIndex(2);
+			_buffer[_index++] = (byte)value;
+			_buffer[_index++] = (byte)(value >> 8);
+		}
+		public void WriteInt32(int value)
+		{
+			WriteUInt32((uint)value);
+		}
+		public void WriteUInt32(uint value)
+		{
+			CheckWriterIndex(4);
+			_buffer[_index++] = (byte)value;
+			_buffer[_index++] = (byte)(value >> 8);
+			_buffer[_index++] = (byte)(value >> 16);
+			_buffer[_index++] = (byte)(value >> 24);
+		}
+		public void WriteInt64(long value)
+		{
+			WriteUInt64((ulong)value);
+		}
+		public void WriteUInt64(ulong value)
+		{
+			CheckWriterIndex(8);
+			_buffer[_index++] = (byte)value;
+			_buffer[_index++] = (byte)(value >> 8);
+			_buffer[_index++] = (byte)(value >> 16);
+			_buffer[_index++] = (byte)(value >> 24);
+			_buffer[_index++] = (byte)(value >> 32);
+			_buffer[_index++] = (byte)(value >> 40);
+			_buffer[_index++] = (byte)(value >> 48);
+			_buffer[_index++] = (byte)(value >> 56);
+		}
+
+		public void WriteUTF8(string value)
+		{
+			if (string.IsNullOrEmpty(value))
+			{
+				WriteUInt16(0);
+			}
+			else
+			{
+				byte[] bytes = Encoding.UTF8.GetBytes(value);
+				int count = bytes.Length;
+				if (count > ushort.MaxValue)
+					throw new FormatException($"Write string length cannot be greater than {ushort.MaxValue} !");
+
+				WriteUInt16(Convert.ToUInt16(count));
+				WriteBytes(bytes);
+			}
+		}
+		public void WriteInt32Array(int[] values)
+		{
+			if (values == null)
+			{
+				WriteUInt16(0);
+			}
+			else
+			{
+				int count = values.Length;
+				if (count > ushort.MaxValue)
+					throw new FormatException($"Write array length cannot be greater than {ushort.MaxValue} !");
+
+				WriteUInt16(Convert.ToUInt16(count));
+				for (int i = 0; i < count; i++)
+				{
+					WriteInt32(values[i]);
+				}
+			}
+		}
+		public void WriteInt64Array(long[] values)
+		{
+			if (values == null)
+			{
+				WriteUInt16(0);
+			}
+			else
+			{
+				int count = values.Length;
+				if (count > ushort.MaxValue)
+					throw new FormatException($"Write array length cannot be greater than {ushort.MaxValue} !");
+
+				WriteUInt16(Convert.ToUInt16(count));
+				for (int i = 0; i < count; i++)
+				{
+					WriteInt64(values[i]);
+				}
+			}
+		}
+		public void WriteUTF8Array(string[] values)
+		{
+			if (values == null)
+			{
+				WriteUInt16(0);
+			}
+			else
+			{
+				int count = values.Length;
+				if (count > ushort.MaxValue)
+					throw new FormatException($"Write array length cannot be greater than {ushort.MaxValue} !");
+
+				WriteUInt16(Convert.ToUInt16(count));
+				for (int i = 0; i < count; i++)
+				{
+					WriteUTF8(values[i]);
+				}
+			}
+		}
+
+		[Conditional("DEBUG")]
+		private void CheckWriterIndex(int length)
+		{
+			if (_index + length > Capacity)
+			{
+				throw new IndexOutOfRangeException();
+			}
+		}
+	}
+}