C# IOUtility IO相关

using System;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Text;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization.Formatters.Soap;
using Rocky.Stored;

namespace Rocky.Utils
{
    public static class IOUtility
    {
        #region Fields
        public static readonly LIFOPool<MemoryStream> MemoryPool;
        private static BinaryFormatter innerBinaryFormatter;
        private static SoapFormatter innerSoapFormatter;
        #endregion

        #region Properties
        public static BinaryFormatter InnerBinaryFormatter
        {
            get
            {
                if (innerBinaryFormatter == null)
                {
                    innerBinaryFormatter = new BinaryFormatter();
                }
                return innerBinaryFormatter;
            }
        }
        public static SoapFormatter InnerSoapFormatter
        {
            get
            {
                if (innerSoapFormatter == null)
                {
                    innerSoapFormatter = new SoapFormatter();
                }
                return innerSoapFormatter;
            }
        }
        #endregion

        #region Constructor
        static IOUtility()
        {
            Freer.Instance.Register(MemoryPool = new LIFOPool<MemoryStream>(
                () => new MemoryStream(0x800),
                stream =>
                {
                    stream.Position = 0L;
                    stream.SetLength(0L);
                }));
        }
        #endregion

        #region Directory
        public static void CreateDirectoryIfNotExists(string path)
        {
            path = Path.GetDirectoryName(AppRuntime.MapPath(path));
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
        }
        #endregion

        #region File
        public static string ReadFile(string path)
        {
            path = AppRuntime.MapPath(path);
            using (StreamReader reader = new StreamReader(path, Encoding.Default))
            {
                return reader.ReadToEnd();
            }
        }
        public static void WriteFile(string path, string content)
        {
            WriteFile(path, content, false);
        }
        public static void WriteFile(string path, string content, bool append)
        {
            path = AppRuntime.MapPath(path);
            using (StreamWriter writer = new StreamWriter(path, append, Encoding.Default))
            {
                writer.Write(content);
            }
        }

        public static byte[] BinaryReadFile(string path)
        {
            path = AppRuntime.MapPath(path);
            using (FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                long length = stream.Length;
                if (length > int.MaxValue)
                {
                    throw new IOException("FileTooLong2GB");
                }
                using (BinaryReader reader = new BinaryReader(stream, Encoding.Default))
                {
                    if (reader.PeekChar() == -1)
                    {
                        throw new IOException();
                    }
                    int count = (int)length;
                    return reader.ReadBytes(count);
                }
            }
        }
        public static void BinaryWriteFile(string path, byte[] buffer)
        {
            BinaryWriteFile(path, buffer, false);
        }
        public static void BinaryWriteFile(string path, byte[] buffer, bool append)
        {
            path = AppRuntime.MapPath(path);
            long length = buffer.LongLength;
            if (length > int.MaxValue)
            {
                throw new IOException("FileTooLong2GB");
            }
            int count = (int)length;
            using (FileStream stream = new FileStream(path, append ? FileMode.Append : FileMode.Create, FileAccess.Write))
            using (BinaryWriter writer = new BinaryWriter(stream, Encoding.Default))
            {
                writer.Write(buffer, 0, count);
            }
        }

        public static void CreateFileFromResource(bool isCalling, string name, string filePath)
        {
            Assembly dll = isCalling ? Assembly.GetCallingAssembly() : Assembly.GetExecutingAssembly();
            CreateFileFromResource(dll.GetManifestResourceStream(name), filePath);
        }
        public static void CreateFileFromResource(string dllPath, string name, string filePath)
        {
            Assembly dll = Assembly.LoadFile(dllPath);
            CreateFileFromResource(dll.GetManifestResourceStream(name), filePath);
        }
        internal static void CreateFileFromResource(Stream stream, string filePath)
        {
            using (stream)
            using (FileStream fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write))
            {
                byte[] buffer = new byte[BufferUtility.FileBufferSize];
                int read;
                while ((read = stream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    fileStream.Write(buffer, 0, read);
                    fileStream.Flush();
                }
            }
        }

        public static Encoding GetEncoding(FileStream stream)
        {
            Encoding targetEncoding = null;
            if (stream.Length >= 2)
            {
                //保存文件流的前4个字节 
                byte byte1 = 0;
                byte byte2 = 0;
                byte byte3 = 0;
                byte byte4 = 0;
                //保存当前Seek位置
                long origPos = stream.Seek(0, SeekOrigin.Begin);
                stream.Seek(0, SeekOrigin.Begin);
                byte1 = Convert.ToByte(stream.ReadByte());
                byte2 = Convert.ToByte(stream.ReadByte());
                if (stream.Length >= 3)
                {
                    byte3 = Convert.ToByte(stream.ReadByte());
                }
                if (stream.Length >= 4)
                {
                    byte4 = Convert.ToByte(stream.ReadByte());
                }
                //根据文件流的前4个字节判断Encoding 
                //Unicode {0xFF, 0xFE}; 
                //BE-Unicode {0xFE, 0xFF}; 
                //UTF8 = {0xEF, 0xBB, 0xBF};
                if (byte1 == 0xFE && byte2 == 0xFF)//UnicodeBe 
                {
                    targetEncoding = Encoding.BigEndianUnicode;
                }
                if (byte1 == 0xFF && byte2 == 0xFE && byte3 != 0xFF)//Unicode 
                {
                    targetEncoding = Encoding.Unicode;
                }
                if (byte1 == 0xEF && byte2 == 0xBB && byte3 == 0xBF)//UTF8 
                {
                    targetEncoding = Encoding.UTF8;
                }
                //恢复Seek位置       
                stream.Seek(origPos, SeekOrigin.Begin);
            }
            return targetEncoding;
        }
        #endregion

        #region Bytes
        public static byte[] ToBytes(Stream stream)
        {
            long position = stream.Position;
            MemoryStream memory = MemoryPool.Retrieve();
            try
            {
                byte[] buffer = new byte[BufferUtility.DefaultBufferSize];
                int read;
                while ((read = stream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    memory.Write(buffer, 0, read);
                }
                return memory.ToArray();
            }
            finally
            {
                stream.Position = position;
                MemoryPool.Store(memory);
            }
        }

        public static byte[] Compress(byte[] data)
        {
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                using (DeflateStream zipStream = new DeflateStream(stream, CompressionMode.Compress))
                {
                    zipStream.Write(data, 0, data.Length);
                    return stream.ToArray();
                }
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }

        public static byte[] Decompress(byte[] data)
        {
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                using (DeflateStream zipStream = new DeflateStream(new MemoryStream(data), CompressionMode.Decompress))
                {
                    byte[] buffer = new byte[BufferUtility.DefaultBufferSize];
                    int read;
                    while ((read = zipStream.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        stream.Write(buffer, 0, read);
                    }
                    return stream.ToArray();
                }
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }
        #endregion

        #region Serialization
        public static byte[] BinarySerialize(object obj)
        {
            return BinarySerialize(obj, false);
        }
        public static byte[] BinarySerialize(object obj, bool compress)
        {
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                InnerBinaryFormatter.Serialize(stream, obj);
                stream.SetLength(stream.Position);
                return compress ? IOUtility.Compress(stream.ToArray()) : stream.ToArray();
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }

        public static object BinaryDeserialize(byte[] data)
        {
            return BinaryDeserialize(data, false);
        }
        public static object BinaryDeserialize(byte[] data, bool decompress)
        {
            if (decompress)
            {
                data = IOUtility.Decompress(data);
            }
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                stream.Write(data, 0, data.Length);
                stream.Position = 0L;
                return InnerBinaryFormatter.Deserialize(stream);
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }

        public static byte[] SoapSerialize(object obj)
        {
            return SoapSerialize(obj, false);
        }
        public static byte[] SoapSerialize(object obj, bool compress)
        {
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                InnerSoapFormatter.Serialize(stream, obj);
                stream.SetLength(stream.Position);
                return compress ? IOUtility.Compress(stream.ToArray()) : stream.ToArray();
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }

        public static object SoapDeserialize(byte[] data)
        {
            return SoapDeserialize(data, false);
        }
        public static object SoapDeserialize(byte[] data, bool decompress)
        {
            if (decompress)
            {
                data = IOUtility.Decompress(data);
            }
            MemoryStream stream = MemoryPool.Retrieve();
            try
            {
                stream.Write(data, 0, data.Length);
                stream.Position = 0L;
                return InnerSoapFormatter.Deserialize(stream);
            }
            finally
            {
                MemoryPool.Store(stream);
            }
        }
        #endregion
    }
}