在Unity3D中用C#封装一个类似AS3的ByteArray类（二）--升级版

大家好，又见面了。上篇写到了在unity3d用使用C#实现一个AS3版本的ByteArray。

没有实现大小序功能。后来在项目中使用，觉得还是有必要加上ENDIAN顺序。

查阅得知，flash as3的bytearray默认的ENDIAN是：BIG_ENDIAN。

但是对于机器码而言，有时候LITTLE_ENDIAN更合适。既然如此，我们在原来的代码上进行修改，添加支持。

注意：默认为BIG_ENDIAN，和flash as3中的默认值是一样的。

下面献上unity3d可以直接使用的C#版本的ByteArray类。在项目中实测运行良好。

public class ByteArray{private MemoryStream _memoryStream;private const byte BooleanFalse = 2;private const byte BooleanTrue = 3;public  string endian;//字节顺序（AS3默认是BIG_ENDIAN）public static string BIG_ENDIAN = "BIG_ENDIAN";public static string LITTLE_ENDIAN = "LITTLE_ENDIAN";public ByteArray (){_memoryStream = new MemoryStream ();endian = ByteArray.BIG_ENDIAN;}public ByteArray (MemoryStream ms){_memoryStream = ms;}public ByteArray (byte[] buffer){_memoryStream = new MemoryStream ();_memoryStream.Write (buffer, 0, buffer.Length);_memoryStream.Position = 0;}public void dispose (){if (_memoryStream != null) {_memoryStream.Close ();_memoryStream.Dispose ();}_memoryStream = null;}public uint Length {get { return (uint)_memoryStream.Length;}}public uint Position {get { return (uint)_memoryStream.Position; }set{ _memoryStream.Position = value; }}public uint BytesAvailable {get { return Length - Position; }}public byte[] GetBuffer (){return _memoryStream.GetBuffer ();}public byte[] ToArray (){return _memoryStream.ToArray ();}public MemoryStream MemoryStream { get { return _memoryStream; } }public bool ReadBoolean (){return _memoryStream.ReadByte () == BooleanTrue;}public byte ReadByte (){return (byte)_memoryStream.ReadByte ();}public void ReadBytes (byte[] bytes, uint offset, uint length){_memoryStream.Read (bytes, (int)offset, (int)length);}public void ReadBytes (ByteArray bytes, uint offset, uint length){uint tmp = bytes.Position;int count = (int)(length != 0 ? length : BytesAvailable);for (int i = 0; i < count; i++) {bytes._memoryStream.Position = i + offset;bytes._memoryStream.WriteByte (ReadByte ());}bytes.Position = tmp;}private byte[] priReadBytes (uint c){byte[] a = new byte[c];if (endian == ByteArray.BIG_ENDIAN) {//BIG_ENDIANfor (uint i = 0; i < c; i++) {a [c - 1 - i] = (byte)_memoryStream.ReadByte ();}} else {//LITTLE_ENDIANfor (uint i = 0; i < c; i++) {a [i] = (byte)_memoryStream.ReadByte ();}}return a;}public double ReadDouble (){byte[] bytes = priReadBytes (8);double value = System.BitConverter.ToDouble (bytes, 0);return value;}public float ReadFloat (){byte[] bytes = priReadBytes (4);float value = System.BitConverter.ToSingle (bytes, 0);return value;}public int ReadInt (){byte[] bytes = priReadBytes (4);int value = System.BitConverter.ToInt32 (bytes, 0);return value;}public short ReadShort (){byte[] bytes = priReadBytes (2);short value = System.BitConverter.ToInt16 (bytes, 0);return value;}public string ReadUTF (){uint length = (uint)ReadShort ();return ReadUTFBytes (length);}public string ReadUTFBytes (uint length){if (length == 0)return string.Empty;UTF8Encoding utf8 = new UTF8Encoding (false, true);byte[] encodedBytes = new byte[length];for (uint i = 0; i < length; i++) {encodedBytes [i] = (byte)_memoryStream.ReadByte ();}string decodedString = utf8.GetString (encodedBytes, 0, encodedBytes.Length);return decodedString;}//=========================================public void WriteBoolean (bool value){WriteByte ((byte)(value ? BooleanTrue : BooleanFalse));}public void WriteByte (byte value){_memoryStream.WriteByte (value);}public void WriteBytes (byte[] bytes, int offset, int length){for (int i = offset; i < offset + length; i++) {if (i < bytes.Length) {_memoryStream.WriteByte (bytes [i]);} else {break;}}}public void WriteBytes (ByteArray bytes, int offset, int length){byte[] data = bytes.ToArray ();WriteBytes (data, offset, length);}public void WriteDouble (double value){byte[] bytes = System.BitConverter.GetBytes (value);WriteBigEndian (bytes);}private void WriteBigEndian (byte[] bytes){if (bytes == null)return;if (endian == ByteArray.BIG_ENDIAN) {//BIG_ENDIANfor (int i = bytes.Length - 1; i >= 0; i--) {WriteByte (bytes [i]);}} else {//LITTLE_ENDIAN;for (int i = 0; i < bytes.Length; i++) {_memoryStream.WriteByte (bytes [i]);}}}public void WriteFloat (float value){byte[] bytes = System.BitConverter.GetBytes (value);WriteBigEndian (bytes);}public void WriteInt (int value){WriteInt32 (value);}private void WriteInt32 (int value){byte[] bytes = System.BitConverter.GetBytes (value);WriteBigEndian (bytes);}public void WriteShort (short value){byte[] bytes = System.BitConverter.GetBytes ((ushort)value);WriteBigEndian (bytes);}public void WriteUTF (string value){UTF8Encoding utf8Encoding = new UTF8Encoding ();int byteCount = utf8Encoding.GetByteCount (value);byte[] buffer = utf8Encoding.GetBytes (value);this.WriteShort ((short)byteCount);if (buffer != null && buffer.Length > 0) {this.WriteBytes (buffer, 0, buffer.Length);}}}

如果此代码对您有用，或者发现有任何问题，请给我留言，以便改进！