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C#实现ByteBuffer类 .

發布時間：2023/12/9 C# 32 豆豆

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?在寫網絡程序的時候,經常需要往一個數組里面壓數據或者取數據,而Java中再Java.nio中有個ByteBuffer能很方便的實現,Delphi中也有個Stream類有著同樣的功能,這里我就模仿JAVA用C#做個最基礎的ByteBuffer類

?????????? 下面是代碼

??????????

using?System;

namespace?System.ByteBuffer
...{
????/**////?<summary>
????///?創建一個可變長的Byte數組方便Push數據和Pop數據
????///?數組的最大長度為1024,超過會產生溢出
????///?數組的最大長度由常量MAX_LENGTH設定
????///?
????///?注:由于實際需要,可能要從左到右取數據,所以這里
????///?定義的Pop函數并不是先進后出的函數,而是從0開始.
????///?
????///?@Author:?Red_angelX
????///?</summary>
????class?ByteBuffer
????...{
????????//數組的最大長度
????????private?const?int?MAX_LENGTH?=?1024;
????????
????????//固定長度的中間數組
????????private?byte[]?TEMP_BYTE_ARRAY?=?new?byte[MAX_LENGTH];
????????
????????//當前數組長度
????????private?int?CURRENT_LENGTH?=?0;

????????//當前Pop指針位置
????????private?int?CURRENT_POSITION?=?0;

????????//最后返回數組
????????private?byte[]?RETURN_ARRAY;

????????/**////?<summary>
????????///?默認構造函數
????????///?</summary>
????????public?ByteBuffer()
????????...{
????????????this.Initialize();
????????}

????????/**////?<summary>
????????///?重載的構造函數,用一個Byte數組來構造
????????///?</summary>
????????///?<param?name="bytes">用于構造ByteBuffer的數組</param>
????????public?ByteBuffer(byte[]?bytes)
????????...{
????????????this.Initialize();
????????????this.PushByteArray(bytes);
????????}
????

????????/**////?<summary>
????????///?獲取當前ByteBuffer的長度
????????///?</summary>
????????public?int?Length
????????...{
????????????get
????????????...{
????????????????return?CURRENT_LENGTH;
????????????}
????????}

????????/**////?<summary>
????????///?獲取/設置當前出棧指針位置
????????///?</summary>
????????public?int?Position
????????...{
????????????get
????????????...{
????????????????return?CURRENT_POSITION;
????????????}
????????????set
????????????...{
????????????????CURRENT_POSITION?=?value;
????????????}
????????}

????????/**////?<summary>
????????///?獲取ByteBuffer所生成的數組
????????///?長度必須小于?[MAXSIZE]
????????///?</summary>
????????///?<returns>Byte[]</returns>
????????public?byte[]?ToByteArray()
????????...{
????????????//分配大小
????????????RETURN_ARRAY?=?new?byte[CURRENT_LENGTH];
????????????//調整指針
????????????Array.Copy(TEMP_BYTE_ARRAY,?0,?RETURN_ARRAY,?0,?CURRENT_LENGTH);
????????????return?RETURN_ARRAY;
????????}

????????/**////?<summary>
????????///?初始化ByteBuffer的每一個元素,并把當前指針指向頭一位
????????///?</summary>
????????public?void?Initialize()
????????...{
????????????TEMP_BYTE_ARRAY.Initialize();
????????????CURRENT_LENGTH?=?0;
????????????CURRENT_POSITION?=?0;
????????}

????????/**////?<summary>
????????///?向ByteBuffer壓入一個字節
????????///?</summary>
????????///?<param?name="by">一位字節</param>
????????public?void?PushByte(byte?by)
????????...{
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?by;
????????}

????????/**////?<summary>
????????///?向ByteBuffer壓入數組
????????///?</summary>
????????///?<param?name="ByteArray">數組</param>
????????public?void?PushByteArray(byte[]?ByteArray)
????????...{
????????????//把自己CopyTo目標數組
????????????ByteArray.CopyTo(TEMP_BYTE_ARRAY,?CURRENT_LENGTH);
????????????//調整長度
????????????CURRENT_LENGTH?+=?ByteArray.Length;
????????}

????????/**////?<summary>
????????///?向ByteBuffer壓入兩字節的Short
????????///?</summary>
????????///?<param?name="Num">2字節Short</param>
????????public?void?PushUInt16(UInt16?Num)
????????...{
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0xff00)?>>?8)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)((Num?&?0x00ff)?&?0xff);
????????}

????????/**////?<summary>
????????///?向ByteBuffer壓入一個無符Int值
????????///?</summary>
????????///?<param?name="Num">4字節UInt32</param>
????????public?void?PushInt(UInt32?Num)
????????...{
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0xff000000)?>>?24)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0x00ff0000)?>>?16)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0x0000ff00)?>>?8)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)((Num?&?0x000000ff)?&?0xff);
????????}

????????/**////?<summary>
????????///?向ByteBuffer壓入一個Long值
????????///?</summary>
????????///?<param?name="Num">4字節Long</param>
????????public?void?PushLong(long?Num)
????????...{
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0xff000000)?>>?24)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0x00ff0000)?>>?16)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)(((Num?&?0x0000ff00)?>>?8)?&?0xff);
????????????TEMP_BYTE_ARRAY[CURRENT_LENGTH++]?=?(byte)((Num?&?0x000000ff)?&?0xff);
????????}

????????/**////?<summary>
????????///?從ByteBuffer的當前位置彈出一個Byte,并提升一位
????????///?</summary>
????????///?<returns>1字節Byte</returns>
????????public?byte?PopByte()
????????...{
????????????byte?ret?=?TEMP_BYTE_ARRAY[CURRENT_POSITION++];
????????????return?ret;
????????}

????????/**////?<summary>
????????///?從ByteBuffer的當前位置彈出一個Short,并提升兩位
????????///?</summary>
????????///?<returns>2字節Short</returns>
????????public?UInt16?PopUInt16()
????????...{
????????????//溢出
????????????if?(CURRENT_POSITION?+?1?>=?CURRENT_LENGTH)
????????????...{
????????????????return?0;
????????????}
????????????UInt16?ret?=?(UInt16)(TEMP_BYTE_ARRAY[CURRENT_POSITION]?<<?8?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?1]);
????????????CURRENT_POSITION?+=?2;
????????????return?ret;
????????}

????????/**////?<summary>
????????///?從ByteBuffer的當前位置彈出一個uint,并提升4位
????????///?</summary>
????????///?<returns>4字節UInt</returns>
????????public?uint?PopUInt()
????????...{????????????
????????????if?(CURRENT_POSITION?+?3?>=?CURRENT_LENGTH)
????????????????return?0;
????????????uint?ret?=?(uint)(TEMP_BYTE_ARRAY[CURRENT_POSITION]?<<?24?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?1]?<<?16?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?2]?<<?8?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?3]);
????????????CURRENT_POSITION?+=?4;
????????????return?ret;
????????}

????????/**////?<summary>
????????///?從ByteBuffer的當前位置彈出一個long,并提升4位
????????///?</summary>
????????///?<returns>4字節Long</returns>
????????public?long?PopLong()
????????...{
????????????if?(CURRENT_POSITION?+?3?>=?CURRENT_LENGTH)
????????????????return?0;
????????????long?ret?=?(long)(TEMP_BYTE_ARRAY[CURRENT_POSITION]?<<?24?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?1]?<<?16?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?2]?<<?8?|?TEMP_BYTE_ARRAY[CURRENT_POSITION?+?3]);
????????????CURRENT_POSITION?+=?4;
????????????return?ret;
????????}

????????/**////?<summary>
????????///?從ByteBuffer的當前位置彈出長度為Length的Byte數組,提升Length位
????????///?</summary>
????????///?<param?name="Length">數組長度</param>
????????///?<returns>Length長度的byte數組</returns>
????????public?byte[]?PopByteArray(int?Length)
????????...{
????????????//溢出
????????????if?(CURRENT_POSITION?+?Length?>=?CURRENT_LENGTH)
????????????...{
????????????????return?new?byte[0];
????????????}
????????????byte[]?ret?=?new?byte[Length];
????????????Array.Copy(TEMP_BYTE_ARRAY,?CURRENT_POSITION,?ret,?0,?Length);
????????????//提升位置
????????????CURRENT_POSITION?+=?Length;
????????????return?ret;
????????}

????}
}

?????????? 由于實際需要我是要從byteArray中從左到右取數據,所以才定義了一個CURRENT_POSITION的變量,如果需要從右到左彈數據并減小Buffer的長度則直接用 --CURRENT_LENGTH就可以了

轉載于:https://www.cnblogs.com/anbylau2130/p/3233207.html

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