How to get little endian data from big endian in c# using bitConverter.ToInt32 method?

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I am making application in C# which has a byte array containing hex values.

I am getting data as a big-endian but I want it as a little-endian and I am using Bitconverter.toInt32 method for converting that value to integer.

My problem is that before converting the value, I have to copy that 4 byte data into temporary array from source byte array and then reverse that temporary byte array.

I can't reverse source array because it also contains other data.

Because of that my application becomes slow.

In the code I have one source array of byte as waveData[] which contains a lot of data.

byte[] tempForTimestamp=new byte[4];
tempForTimestamp[0] = waveData[290];
tempForTimestamp[1] = waveData[289];
tempForTimestamp[2] = waveData[288];
tempForTimestamp[3] = waveData[287];
int number = BitConverter.ToInt32(tempForTimestamp, 0);

Is there any other method for that conversion?

If you know the data is big-endian, perhaps just do it manually:

int value = (buffer[i++] << 24) | (buffer[i++] << 16)
          | (buffer[i++] << 8) | buffer[i++];

this will work reliably on any CPU, too. Note i is your current offset into the buffer.

Another approach would be to shuffle the array:

byte tmp = buffer[i+3];
buffer[i+3] = buffer[i];
buffer[i] = tmp;
tmp = buffer[i+2];
buffer[i+2] = buffer[i+1];
buffer[i+1] = tmp;
int value = BitConverter.ToInt32(buffer, i);
i += 4;

I find the first immensely more readable, and there are no branches / complex code, so it should work pretty fast too. The second could also run into problems on some platforms (where the CPU is already running big-endian).

BitConverter Class (System), Indicates the byte order ("endianness") in which data is stored in this computer architecture. C# Copy. // Example of the BitConverter.IsLittleEndian field. using System; class LittleEndDemo { public static void Main( ) { Console.WriteLine( "​Little-endian" means the most significant byte is on the right end of a word. Note. "Little-endian" means the most significant byte is on the right end of a word. Note You can convert from network byte order to the byte order of the host computer without retrieving the value of the BitConverter.IsLittleEndian field by passing a 16-bit, 32-bit, or 64 bit integer to the IPAddress.HostToNetworkOrder method.

In modern-day Linq the one-liner and easiest to understand version would be:

int number = BitConverter.ToInt32(waveData.Skip(286).Take(4).Reverse().ToArray(), 0);

You could also...

byte[] tempForTimestamp = new byte[4];
Array.Copy(waveData, 287, tempForTimestamp, 0, 4);
Array.Reverse(tempForTimestamp);
int number = BitConverter.ToInt32(tempForTimestamp);

:)

BitConverter.IsLittleEndian Field (System), Here the big endian value is converted to little endian value. The C# program is successfully compiled and executed with Microsoft Visual Program { static int ReverseBytes(int val) { byte[] intAsBytes = BitConverter. to order of the bytes in the array returned by the GetBytes method overloads, Data Structures MCQs. On Windows / .NET, you are usually little-endian, so I'm guessing the data is big-endian. That means you need to reverse the data for each value, separately (not the entire array). To write this in a way that is CPU-safe, the best option is to check BitConverter.IsLittleEndian , and compensate when necessary.

Here you go

public static int SwapEndianness(int value)
{
    var b1 = (value >> 0) & 0xff;
    var b2 = (value >> 8) & 0xff;
    var b3 = (value >> 16) & 0xff;
    var b4 = (value >> 24) & 0xff;

    return b1 << 24 | b2 << 16 | b3 << 8 | b4 << 0;
} 

C# Program to Convert Big Endian to Little Endian, Use the BitConverter class to change representations of types. methods. It is useful when manipulating or reading binary data. These methods convert the byte values stores in a byte array to native integers. The int and uint can have different values if the sign bit differs. Most personal computers are little endian. For example, if the number is 0x9876543210, then the big endian will be − The little endian will be like this − In this section we will see how to convert little endian to big endian and vice versa. To do this we have to interchange the 1st and 4th bytes, and 2nd and 3rd bytes. We can interchange them using logical expressions.

Declare this class:

using static System.Net.IPAddress;

namespace BigEndianExtension
{
    public static class BigEndian
    {
        public static short ToBigEndian(this short value)   => HostToNetworkOrder(value);
        public static int   ToBigEndian(this int value)     => HostToNetworkOrder(value);
        public static long  ToBigEndian(this long value)    => HostToNetworkOrder(value);
        public static short FromBigEndian(this short value) => NetworkToHostOrder(value);
        public static int   FromBigEndian(this int value)   => NetworkToHostOrder(value);
        public static long  FromBigEndian(this long value)  => NetworkToHostOrder(value);
    }
}

Example, create a form with a button and a multiline textbox:

using BigEndianExtension;

private void button1_Click(object sender, EventArgs e)
{
    short int16 = 0x1234;
    int int32   = 0x12345678;
    long int64  = 0x123456789abcdef0;
    string text = string.Format("LE:{0:X4}\r\nBE:{1:X4}\r\n", int16, int16.ToBigEndian());

    text += string.Format("LE:{0:X8}\r\nBE:{1:X8}\r\n", int32, int32.ToBigEndian());
    text += string.Format("LE:{0:X16}\r\nBE:{1:X16}\r\n", int64, int64.ToBigEndian());
    textBox1.Text = text;
}
//Some code...

C# BitConverter Examples, Converting a Big Endian Integer to Low Endian using C# You can use bit shift and logical operators, or use high level C# methods. Here's a bit static int ReverseBytes(int val) { byte[] intAsBytes = BitConverter. ToInt32(intAsBytes, 0); } Reading the MNIST Data Set with C#In "Machine Learning". You need to know about network byte order as well as CPU endian-ness. Typically for TCP/UDP comms, you always convert data to network byte order using the htons function (and ntohs, and their related functions). Normally network order is big-endian, but in this case (for some reason!) the comms is little endian, so those functions are not very

Add a reference to System.Memory nuget and use BinaryPrimitives.ReverseEndianness().

using System.Buffers.Binary;
number = BinaryPrimitives.ReverseEndianness(number);

It supports both signed and unsigned integers (byte/short/int/long).

Converting a Big Endian Integer to Low Endian using C#, Reverse Bytes (Little/Big Endian) [C#]. This example shows how to reverse byte order in integer numbers. This can be used to change between little-endian and  Write a C program to check if the underlying architecture is little endian or big endian. Big endian and little endian are two formats to store multibyte data types into computer's memory. These two formats are also called network byte order and host byte order respectively.

Reverse Bytes (Little/Big Endian) [C#], The use of BitConverter Class is to convert a base data types to an array of bytes This class provides different types of methods to perform the conversion. IsLittleEndian: This indicates the byte order (“endianness”) in which data is stored ToInt32(Byte[], Int32), Returns a 32-bit signed integer converted from four bytes​  The order of bytes in the array returned by the GetBytes method overloads (as well as the order of bits in the integer returned by the DoubleToInt64Bits method and the order of hexadecimal strings returned by the ToString(Byte[]) method) depends on whether the computer architecture is little-endian or big-endian.

C#, You can use those methods to convert data that you load from files and Text = txt; // Convert to an integer. int int_value = BitConverter. GetBytes to convert the integer back into an array of bytes. For example, if you are working on a “big endian” system but the data was generated on a “little endian”  We can also check the endianness of the machine using the union. We need to create a union that has an integer variable and an array of 4 characters. If the first element (au8DataBuff [0]) of the character array is equal to the LSB Bytes of integer, then the system will be little endian otherwise big-endian.

Convert an array of bytes into an integer and back in C#, system, it would be stored as 524F (52 at address 1000, 4F at 1001). Returns Byte[]. A byte array with length 1. Examples. The following example converts the bit patterns of Boolean values to Byte arrays with the GetBytes method.. using namespace System; int main() { // Define Boolean true and false values.

Comments
  • doesn't the 'int value = x[i] | x[j] | x[k] | ]x[l];' already assume big-endian? I know BitConverter assumes little-endian, so your first example would be needed if he was going to pass the result to BitConverter.ToInt32(tempForTimestamp, 0); but if he just wanted the int value, then wouldn't he just not use the bit shifts???
  • @Goku "int = xxxx" says nothing whatsoever about endianness, and BitConverter does not assume little-endian; it asssumes CPU-endian - just: you happen to be using a little-endian CPU. Big-endian CPUs exist and can run .NET. If you want t check: query BitConverter.IsLittleEndian
  • @Goku what is array1? you can't assign an integer to an array, and you can't access an integer via indexers. The details really, really matter here, so we need to be very explicit. Also, it isn't true to say that Windows is strictly little-endian. Remember Itaniums? Now, when we're assigning an integer the entire point is that how that is implemented internally is masked from us unless we look beneath the covers. Integers on big and little endian CPUs behave identically in most ways, including shift operators. It is only when we do re-interpret casts (unsafe thunks, etc) that...
  • ...we can see the difference. Which basically means: serializers and interop code. Or things using SIMD.
  • I was wrong, I played around some more in a console app and completely forgot that if I shift and OR, the other byte being compared to is padded with 0s ON THE LEFT before doing the comparison (this lead to some bad assumptions from weird results). Sorry for the sloppy comments, I'll delete them so they don't confuse someone else
  • The first form didn't work for me without a .ToArray() after Reverse().
  • Buffer.BlockCopy is better than Array.Copy if you are handling byte array.
  • A nice feature of this answer is that it is platform-independent.
  • Unfortunately there is no overload of NetworkToHostOrder for unsigned integers, but you can use BinaryPrimitives.ReverseEndianness() by importing the System.Memory nuget.