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- //------------------------------------------------------------
- // Game Framework
- // Copyright © 2013-2021 loyalsoft. All rights reserved.
- // Homepage: http://www.game7000.com/
- // Feedback: http://www.game7000.com/
- //------------------------------------------------------------
- using System;
- using System.IO;
- namespace GameFramework.FileSystem
- {
- /// <summary>
- /// 通用文件系统流。
- /// </summary>
- public sealed class CommonFileSystemStream : FileSystemStream, IDisposable
- {
- private readonly FileStream m_FileStream;
- /// <summary>
- /// 初始化通用文件系统流的新实例。
- /// </summary>
- /// <param name="fullPath">要加载的文件系统的完整路径。</param>
- /// <param name="access">要加载的文件系统的访问方式。</param>
- /// <param name="createNew">是否创建新的文件系统流。</param>
- public CommonFileSystemStream(string fullPath, FileSystemAccess access, bool createNew)
- {
- if (string.IsNullOrEmpty(fullPath))
- {
- throw new GameFrameworkException("Full path is invalid.");
- }
- switch (access)
- {
- case FileSystemAccess.Read:
- m_FileStream = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read);
- break;
- case FileSystemAccess.Write:
- m_FileStream = new FileStream(fullPath, createNew ? FileMode.Create : FileMode.Open, FileAccess.Write, FileShare.Read);
- break;
- case FileSystemAccess.ReadWrite:
- m_FileStream = new FileStream(fullPath, createNew ? FileMode.Create : FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
- break;
- default:
- throw new GameFrameworkException("Access is invalid.");
- }
- }
- /// <summary>
- /// 获取或设置文件系统流位置。
- /// </summary>
- public override long Position
- {
- get
- {
- return m_FileStream.Position;
- }
- set
- {
- m_FileStream.Position = value;
- }
- }
- /// <summary>
- /// 获取文件系统流长度。
- /// </summary>
- public override long Length
- {
- get
- {
- return m_FileStream.Length;
- }
- }
- /// <summary>
- /// 设置文件系统流长度。
- /// </summary>
- /// <param name="length">要设置的文件系统流的长度。</param>
- public override void SetLength(long length)
- {
- m_FileStream.SetLength(length);
- }
- /// <summary>
- /// 定位文件系统流位置。
- /// </summary>
- /// <param name="offset">要定位的文件系统流位置的偏移。</param>
- /// <param name="origin">要定位的文件系统流位置的方式。</param>
- public override void Seek(long offset, SeekOrigin origin)
- {
- m_FileStream.Seek(offset, origin);
- }
- /// <summary>
- /// 从文件系统流中读取一个字节。
- /// </summary>
- /// <returns>读取的字节,若已经到达文件结尾,则返回 -1。</returns>
- public override int ReadByte()
- {
- return m_FileStream.ReadByte();
- }
- /// <summary>
- /// 从文件系统流中读取二进制流。
- /// </summary>
- /// <param name="buffer">存储读取文件内容的二进制流。</param>
- /// <param name="startIndex">存储读取文件内容的二进制流的起始位置。</param>
- /// <param name="length">存储读取文件内容的二进制流的长度。</param>
- /// <returns>实际读取了多少字节。</returns>
- public override int Read(byte[] buffer, int startIndex, int length)
- {
- return m_FileStream.Read(buffer, startIndex, length);
- }
- /// <summary>
- /// 向文件系统流中写入一个字节。
- /// </summary>
- /// <param name="value">要写入的字节。</param>
- public override void WriteByte(byte value)
- {
- m_FileStream.WriteByte(value);
- }
- /// <summary>
- /// 向文件系统流中写入二进制流。
- /// </summary>
- /// <param name="buffer">存储写入文件内容的二进制流。</param>
- /// <param name="startIndex">存储写入文件内容的二进制流的起始位置。</param>
- /// <param name="length">存储写入文件内容的二进制流的长度。</param>
- public override void Write(byte[] buffer, int startIndex, int length)
- {
- m_FileStream.Write(buffer, startIndex, length);
- }
- /// <summary>
- /// 将文件系统流立刻更新到存储介质中。
- /// </summary>
- public override void Flush()
- {
- m_FileStream.Flush();
- }
- /// <summary>
- /// 关闭文件系统流。
- /// </summary>
- public override void Close()
- {
- m_FileStream.Close();
- }
- /// <summary>
- /// 销毁文件系统流。
- /// </summary>
- public void Dispose()
- {
- m_FileStream.Dispose();
- }
- }
- }
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