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当前位置:首页 >> 网络编程 >> C#教程 >> c#,关于Big Endian 和 Little Endian,以及转换类

c#,关于Big Endian 和 Little Endian,以及转换类(1/2)

来源:网络整理     时间:2015-12-16     关键词:require,Exception

本篇文章主要介绍了"c#,关于Big Endian 和 Little Endian,以及转换类",主要涉及到require,Exception方面的内容,对于C#教程感兴趣的同学可以参考一下: Big Endian:最高字节在地址最低位,最低字节在地址最高位,依次排列。 Little Endian:最低字节在最低位,最高字节在最高位,反序排列。当在本地...

Big Endian:最高字节在地址最低位,最低字节在地址最高位,依次排列。 
Little Endian:最低字节在最低位,最高字节在最高位,反序排列。

当在本地主机上,无需注意机器用的是Big Endian还是Little Endian。但是网络上都是用的是Big Endian,需要进行一个转换,但是c#提供的BitConverter默认使用的Little Endian,在需与网络通信时,反的字节序大有不便,特此提供一个可选Big Endian和Little Endian类方便转换。

为什么存在Little Endian?因为对于机器来说,Little Endian更有利于机器的运算。内存地址由低位到高位,在两个数相加运算,直接在高位添加进位数,不必移动内存地址

第一部分

c#,关于Big Endian 和 Little Endian,以及转换类c#,关于Big Endian 和 Little Endian,以及转换类

using System;
using System.Runtime.InteropServices;

namespace MiscUtil.Conversion
{
    ///<summary>/// Equivalent of System.BitConverter, but with either endianness.
    ///</summary>publicabstractclass EndianBitConverter
    {
        #region Endianness of this converter
        ///<summary>/// Indicates the byte order ("endianess") in which data is converted using this class.
        ///</summary>///<remarks>/// Different computer architectures store data using different byte orders. "Big-endian"
        /// means the most significant byte is on the left end of a word. "Little-endian" means the
        /// most significant byte is on the right end of a word.
        ///</remarks>///<returns>true if this converter is little-endian, false otherwise.</returns>publicabstractbool IsLittleEndian();

        ///<summary>/// Indicates the byte order ("endianess") in which data is converted using this class.
        ///</summary>publicabstract Endianness Endianness { get; }
        #endregion#region Factory properties
        static LittleEndianBitConverter little = new LittleEndianBitConverter();
        ///<summary>/// Returns a little-endian bit converter instance. The same instance is
        /// always returned.
        ///</summary>publicstatic LittleEndianBitConverter Little
        {
            get { return little; }
        }

        static BigEndianBitConverter big = new BigEndianBitConverter();
        ///<summary>/// Returns a big-endian bit converter instance. The same instance is
        /// always returned.
        ///</summary>publicstatic BigEndianBitConverter Big
        {
            get { return big; }
        }
        #endregion#region Double/primitive conversions
        ///<summary>/// Converts the specified double-precision floating point number to a
        /// 64-bit signed integer. Note: the endianness of this converter does not
        /// affect the returned value.
        ///</summary>///<param name="value">The number to convert. </param>///<returns>A 64-bit signed integer whose value is equivalent to value.</returns>publiclong DoubleToInt64Bits(double value)
        {
            return BitConverter.DoubleToInt64Bits(value);
        }

        ///<summary>/// Converts the specified 64-bit signed integer to a double-precision
        /// floating point number. Note: the endianness of this converter does not
        /// affect the returned value.
        ///</summary>///<param name="value">The number to convert. </param>///<returns>A double-precision floating point number whose value is equivalent to value.</returns>publicdouble Int64BitsToDouble (long value)
        {
            return BitConverter.Int64BitsToDouble(value);
        }

        ///<summary>/// Converts the specified single-precision floating point number to a
        /// 32-bit signed integer. Note: the endianness of this converter does not
        /// affect the returned value.
        ///</summary>///<param name="value">The number to convert. </param>///<returns>A 32-bit signed integer whose value is equivalent to value.</returns>publicint SingleToInt32Bits(float value)
        {
            returnnew Int32SingleUnion(value).AsInt32;
        }

        ///<summary>/// Converts the specified 32-bit signed integer to a single-precision floating point
        /// number. Note: the endianness of this converter does not
        /// affect the returned value.
        ///</summary>///<param name="value">The number to convert. </param>///<returns>A single-precision floating point number whose value is equivalent to value.</returns>publicfloat Int32BitsToSingle (int value)
        {
            returnnew Int32SingleUnion(value).AsSingle;
        }
        #endregion#region To(PrimitiveType) conversions
        ///<summary>/// Returns a Boolean value converted from one byte at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>true if the byte at startIndex in value is nonzero; otherwise, false.</returns>publicbool ToBoolean (byte[] value, int startIndex)
        {
            CheckByteArgument(value, startIndex, 1);
            return BitConverter.ToBoolean(value, startIndex);
        }

        ///<summary>/// Returns a Unicode character converted from two bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A character formed by two bytes beginning at startIndex.</returns>publicchar ToChar (byte[] value, int startIndex)
        {
            returnunchecked((char) (CheckedFromBytes(value, startIndex, 2)));
        }

        ///<summary>/// Returns a double-precision floating point number converted from eight bytes
        /// at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A double precision floating point number formed by eight bytes beginning at startIndex.</returns>publicdouble ToDouble (byte[] value, int startIndex)
        {
            return Int64BitsToDouble(ToInt64(value, startIndex));
        }

        ///<summary>/// Returns a single-precision floating point number converted from four bytes
        /// at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A single precision floating point number formed by four bytes beginning at startIndex.</returns>publicfloat ToSingle (byte[] value, int startIndex)
        {
            return Int32BitsToSingle(ToInt32(value, startIndex));
        }

        ///<summary>/// Returns a 16-bit signed integer converted from two bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 16-bit signed integer formed by two bytes beginning at startIndex.</returns>publicshort ToInt16 (byte[] value, int startIndex)
        {
            returnunchecked((short) (CheckedFromBytes(value, startIndex, 2)));
        }

        ///<summary>/// Returns a 32-bit signed integer converted from four bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 32-bit signed integer formed by four bytes beginning at startIndex.</returns>publicint ToInt32 (byte[] value, int startIndex)
        {
            returnunchecked((int) (CheckedFromBytes(value, startIndex, 4)));
        }

        ///<summary>/// Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 64-bit signed integer formed by eight bytes beginning at startIndex.</returns>publiclong ToInt64 (byte[] value, int startIndex)
        {
            return CheckedFromBytes(value, startIndex, 8);
        }

        ///<summary>/// Returns a 16-bit unsigned integer converted from two bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 16-bit unsigned integer formed by two bytes beginning at startIndex.</returns>publicushort ToUInt16 (byte[] value, int startIndex)
        {
            returnunchecked((ushort) (CheckedFromBytes(value, startIndex, 2)));
        }

        ///<summary>/// Returns a 32-bit unsigned integer converted from four bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 32-bit unsigned integer formed by four bytes beginning at startIndex.</returns>publicuint ToUInt32 (byte[] value, int startIndex)
        {
            returnunchecked((uint) (CheckedFromBytes(value, startIndex, 4)));
        }

        ///<summary>/// Returns a 64-bit unsigned integer converted from eight bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A 64-bit unsigned integer formed by eight bytes beginning at startIndex.</returns>publiculong ToUInt64 (byte[] value, int startIndex)
        {
            returnunchecked((ulong) (CheckedFromBytes(value, startIndex, 8)));
        }

        ///<summary>/// Checks the given argument for validity.
        ///</summary>///<param name="value">The byte array passed in</param>///<param name="startIndex">The start index passed in</param>///<param name="bytesrequired">The number of bytes required</param>///<Exception cref="ArgumentNullException">value is a null reference</Exception>///<Exception cref="ArgumentOutOfRangeException">/// startIndex is less than zero or greater than the length of value minus bytesrequired.
        ///</Exception>staticvoid CheckByteArgument(byte[] value, int startIndex, int bytesrequired)
        {
            if (value==null)
            {
                thrownew ArgumentNullException("value");
            }
            if (startIndex < 0 || startIndex > value.Length-bytesrequired)
            {
                thrownew ArgumentOutOfRangeException("startIndex");
            }
        }

        ///<summary>/// Checks the arguments for validity before calling FromBytes
        /// (which can therefore assume the arguments are valid).
        ///</summary>///<param name="value">The bytes to convert after checking</param>///<param name="startIndex">The index of the first byte to convert</param>///<param name="bytesToConvert">The number of bytes to convert</param>///<returns></returns>long CheckedFromBytes(byte[] value, int startIndex, int bytesToConvert)
        {
            CheckByteArgument(value, startIndex, bytesToConvert);
            return FromBytes(value, startIndex, bytesToConvert);
        }

        ///<summary>/// Convert the given number of bytes from the given array, from the given start
        /// position, into a long, using the bytes as the least significant part of the long.
        /// By the time this is called, the arguments have been checked for validity.
        ///</summary>///<param name="value">The bytes to convert</param>///<param name="startIndex">The index of the first byte to convert</param>///<param name="bytesToConvert">The number of bytes to use in the conversion</param>///<returns>The converted number</returns>protectedabstractlong FromBytes(byte[] value, int startIndex, int bytesToConvert);
        #endregion#region ToString conversions
        ///<summary>/// Returns a String converted from the elements of a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<remarks>All the elements of value are converted.</remarks>///<returns>/// A String of hexadecimal pairs separated by hyphens, where each pair
        /// represents the corresponding element in value; for example, "7F-2C-4A".
        ///</returns>publicstaticstring ToString(byte[] value)
        {
            return BitConverter.ToString(value);
        }

        ///<summary>/// Returns a String converted from the elements of a byte array starting at a specified array position.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<remarks>The elements from array position startIndex to the end of the array are converted.</remarks>///<returns>/// A String of hexadecimal pairs separated by hyphens, where each pair
        /// represents the corresponding element in value; for example, "7F-2C-4A".
        ///</returns>publicstaticstring ToString(byte[] value, int startIndex)
        {
            return BitConverter.ToString(value, startIndex);
        }

        ///<summary>/// Returns a String converted from a specified number of bytes at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<param name="length">The number of bytes to convert.</param>///<remarks>The length elements from array position startIndex are converted.</remarks>///<returns>/// A String of hexadecimal pairs separated by hyphens, where each pair
        /// represents the corresponding element in value; for example, "7F-2C-4A".
        ///</returns>publicstaticstring ToString(byte[] value, int startIndex, int length)
        {
            return BitConverter.ToString(value, startIndex, length);
        }
        #endregion#region    Decimal conversions
        ///<summary>/// Returns a decimal value converted from sixteen bytes
        /// at a specified position in a byte array.
        ///</summary>///<param name="value">An array of bytes.</param>///<param name="startIndex">The starting position within value.</param>///<returns>A decimal  formed by sixteen bytes beginning at startIndex.</returns>publicdecimal ToDecimal (byte[] value, int startIndex)
        {
            // HACK: This always assumes four parts, each in their own endianness,
            // starting with the first part at the start of the byte array.
            // On the other hand, there's no real format specified...int[] parts = newint[4];
            for (int i=0; i < 4; i++)
            {
                parts[i] = ToInt32(value, startIndex+i*4);
            }
            returnnew Decimal(parts);
        }

        ///<summary>/// Returns the specified decimal value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 16.</returns>publicbyte[] GetBytes(decimal value)
        {
            byte[] bytes = newbyte[16];
            int[] parts = decimal.GetBits(value);
            for (int i=0; i < 4; i++)
            {
                CopyBytesImpl(parts[i], 4, bytes, i*4);
            }
            return bytes;
        }

        ///<summary>/// Copies the specified decimal value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">A character to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(decimal value, byte[] buffer, int index)
        {
            int[] parts = decimal.GetBits(value);
            for (int i=0; i < 4; i++)
            {
                CopyBytesImpl(parts[i], 4, buffer, i*4+index);
            }
        }
        #endregion#region GetBytes conversions
        ///<summary>/// Returns an array with the given number of bytes formed
        /// from the least significant bytes of the specified value.
        /// This is used to implement the other GetBytes methods.
        ///</summary>///<param name="value">The value to get bytes for</param>///<param name="bytes">The number of significant bytes to return</param>byte[] GetBytes(long value, int bytes)
        {
            byte[] buffer = newbyte[bytes];
            CopyBytes(value, bytes, buffer, 0);
            return buffer;
        }

        ///<summary>/// Returns the specified Boolean value as an array of bytes.
        ///</summary>///<param name="value">A Boolean value.</param>///<returns>An array of bytes with length 1.</returns>publicbyte[] GetBytes(bool value)
        {
            return BitConverter.GetBytes(value);
        }

        ///<summary>/// Returns the specified Unicode character value as an array of bytes.
        ///</summary>///<param name="value">A character to convert.</param>///<returns>An array of bytes with length 2.</returns>publicbyte[] GetBytes(char value)
        {
            return GetBytes(value, 2);
        }

        ///<summary>/// Returns the specified double-precision floating point value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 8.</returns>publicbyte[] GetBytes(double value)
        {
            return GetBytes(DoubleToInt64Bits(value), 8);
        }

        ///<summary>/// Returns the specified 16-bit signed integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 2.</returns>publicbyte[] GetBytes(short value)
        {
            return GetBytes(value, 2);
        }

        ///<summary>/// Returns the specified 32-bit signed integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 4.</returns>publicbyte[] GetBytes(int value)
        {
            return GetBytes(value, 4);
        }

        ///<summary>/// Returns the specified 64-bit signed integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 8.</returns>publicbyte[] GetBytes(long value)
        {
            return GetBytes(value, 8);
        }

        ///<summary>/// Returns the specified single-precision floating point value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 4.</returns>publicbyte[] GetBytes(float value)
        {
            return GetBytes(SingleToInt32Bits(value), 4);
        }

        ///<summary>/// Returns the specified 16-bit unsigned integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 2.</returns>publicbyte[] GetBytes(ushort value)
        {
            return GetBytes(value, 2);
        }

        ///<summary>/// Returns the specified 32-bit unsigned integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 4.</returns>publicbyte[] GetBytes(uint value)
        {
            return GetBytes(value, 4);
        }

        ///<summary>/// Returns the specified 64-bit unsigned integer value as an array of bytes.
        ///</summary>///<param name="value">The number to convert.</param>///<returns>An array of bytes with length 8.</returns>publicbyte[] GetBytes(ulong value)
        {
            return GetBytes(unchecked((long)value), 8);
        }

        #endregion#region CopyBytes conversions
        ///<summary>/// Copies the given number of bytes from the least-specific
        /// end of the specified value into the specified byte array, beginning
        /// at the specified index.
        /// This is used to implement the other CopyBytes methods.
        ///</summary>///<param name="value">The value to copy bytes for</param>///<param name="bytes">The number of significant bytes to copy</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>void CopyBytes(long value, int bytes, byte[] buffer, int index)
        {
            if (buffer==null)
            {
                thrownew ArgumentNullException("buffer", "Byte array must not be null");
            }
            if (buffer.Length < index+bytes)
            {
                thrownew ArgumentOutOfRangeException("Buffer not big enough for value");
            }
            CopyBytesImpl(value, bytes, buffer, index);
        }

        ///<summary>/// Copies the given number of bytes from the least-specific
        /// end of the specified value into the specified byte array, beginning
        /// at the specified index.
        /// This must be implemented in concrete derived classes, but the implementation
        /// may assume that the value will fit into the buffer.
        ///</summary>///<param name="value">The value to copy bytes for</param>///<param name="bytes">The number of significant bytes to copy</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>protectedabstractvoid CopyBytesImpl(long value, int bytes, byte[] buffer, int index);

        ///<summary>/// Copies the specified Boolean value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">A Boolean value.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(bool value, byte[] buffer, int index)
        {
            CopyBytes(value ? 1 : 0, 1, buffer, index);
        }

        ///<summary>/// Copies the specified Unicode character value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">A character to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(char value, byte[] buffer, int index)
        {
            CopyBytes(value, 2, buffer, index);
        }

        ///<summary>/// Copies the specified double-precision floating point value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(double value, byte[] buffer, int index)
        {
            CopyBytes(DoubleToInt64Bits(value), 8, buffer, index);
        }

        ///<summary>/// Copies the specified 16-bit signed integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(short value, byte[] buffer, int index)
        {
            CopyBytes(value, 2, buffer, index);
        }

        ///<summary>/// Copies the specified 32-bit signed integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(int value, byte[] buffer, int index)
        {
            CopyBytes(value, 4, buffer, index);
        }

        ///<summary>/// Copies the specified 64-bit signed integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(long value, byte[] buffer, int index)
        {
            CopyBytes(value, 8, buffer, index);
        }

        ///<summary>/// Copies the specified single-precision floating point value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(float value, byte[] buffer, int index)
        {
            CopyBytes(SingleToInt32Bits(value), 4, buffer, index);
        }

        ///<summary>/// Copies the specified 16-bit unsigned integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(ushort value, byte[] buffer, int index)
        {
            CopyBytes(value, 2, buffer, index);
        }

        ///<summary>/// Copies the specified 32-bit unsigned integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(uint value, byte[] buffer, int index)
        {
            CopyBytes(value, 4, buffer, index);
        }

        ///<summary>/// Copies the specified 64-bit unsigned integer value into the specified byte array,
        /// beginning at the specified index.
        ///</summary>///<param name="value">The number to convert.</param>///<param name="buffer">The byte array to copy the bytes into</param>///<param name="index">The first index into the array to copy the bytes into</param>publicvoid CopyBytes(ulong value, byte[] buffer, int index)
        {
            CopyBytes(unchecked((long)value), 8, buffer, index);
        }

        #endregion#region Private struct used for Single/Int32 conversions
        ///<summary>/// Union used solely for the equivalent of DoubleToInt64Bits and vice versa.
        ///</summary>        [StructLayout(LayoutKind.Explicit)]
            struct Int32SingleUnion
        {
            ///<summary>/// Int32 version of the value.
            ///</summary>            [FieldOffset(0)]
            int i;
            ///<summary>/// Single version of the value.
            ///</summary>            [FieldOffset(0)]
            float f;

            ///<summary>/// Creates an instance representing the given integer.
            ///</summary>///<param name="i">The integer value of the new instance.</param>internal Int32SingleUnion(int i)
            {
                this.f = 0; // Just to keep the compiler happythis.i = i;
            }

            ///<summary>/// Creates an instance representing the given floating point number.
            ///</summary>///<param name="f">The floating point value of the new instance.</param>internal Int32SingleUnion(float f)
            {
                this.i = 0; // Just to keep the compiler happythis.f = f;
            }

            ///<summary>/// Returns the value of the instance as an integer.
            ///</summary>internalint AsInt32
            {
                get { return i; }
            }

            ///<summary>/// Returns the value of the instance as a floating point number.
            ///</summary>internalfloat AsSingle
            {
                get { return f; }
            }
        }
        #endregion    }
}

EndianBitConverter

第二部分

c#,关于Big Endian 和 Little Endian,以及转换类c#,关于Big Endian 和 Little Endian,以及转换类

namespace MiscUtil.Conversion
{
    ///<summary>/// Implementation of EndianBitConverter which converts to/from big-endian
    /// byte arrays.
    ///</summary>publicsealedclass BigEndianBitConverter : EndianBitConverter
    {
        ///<summary>/// Indicates the byte order ("endianess") in which data is converted using this class.
        ///</summary>///<remarks>/// Different computer architectures store data using different byte orders. "Big-endian"
        /// means the most significant byte is on the left end of a word. "Little-endian" means the
        /// most significant byte is on the right end of a word.
        ///</remarks>///<returns>true if this converter is little-endian, false otherwise.</returns>publicsealedoverridebool IsLittleEndian()
        {
            returnfalse;
        }

        ///<summary>/// Indicates the byte order ("endianess") in which data is converted using this class.
        ///</summary>publicsealedoverride Endianness Endianness
        {
            get { return Endianness.BigEndian; }
        }

        ///<summary>/// Copies the specified number of bytes from value to buffer, starting at index.
        ///</summary>///<param name="value">The value to copy</param>///<param name="bytes">The number of bytes to copy</param>///<param name="buffer">The buffer to copy the bytes into</param>///<param name="index">The index to start at</param>protectedoverridevoid CopyBytesImpl(long value, int bytes, byte[] buffer, int index)
        {
            int endOffset = index+bytes-1;
            for (int i=0; i < bytes; i++)
            {
                buffer[endOffset-i] = unchecked((byte)(value&0xff));
                value = value >> 8;
            }
        }

        ///<summary>/// Returns a value built from the specified number of bytes from the given buffer,
        /// starting at index.
        ///</summary>///<param name="buffer">The data in byte array format</param>///<param name="startIndex">The first index to use</param>///<param name="bytesToConvert">The number of bytes to use</param>///<returns>The value built from the given bytes</returns>protectedoverridelong FromBytes(byte[] buffer, int startIndex, int bytesToConvert)
        {
            long ret = 0;
            for (int i=0; i < bytesToConvert; i++)
            {
                ret = unchecked((ret << 8) | buffer[startIndex+i]);
            }
            return ret;
        }
    }
}

BigEndianBitConverter

第三部分

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