C# Converting one datatype array to another

kevins963 · 08-20-2009, 01:44 PM

I am trying to find a fast way to convert a byte array that stores 12 bit data into an integer array in CSharp.

I compared using a for loop vs the Array.Copy() and there is a sigficant optimization when using the Array.Copy. Now I am trying to see if there is a similar function that you can use on more unique datatypes?

The code I currently use to convert my 12 bit data into an integer is as follow:

Code:

index2 = 0;
for(index = 0; index < 230; index+=2)
{
	ecg_buffer[index] = (temp_buffer[index2] << 4) | ((temp_buffer[index2+1] & 0xF0)>> 4);
	ecg_buffer[index+1] = ((temp_buffer[index2+1] & 0x0F) << 8) | temp_buffer[index2+2];

	index2+=3;
}

temp_buffer is a byte array that holds the 12 bit values, so every three bytes contain two 12-bit values.

ecg_buffer contain the converted integer values

Now is there an optimized function in CSharp that will convert every 12 bits to another datatype array?

Thank you much,

Kevin

cyreon · 09-13-2009, 08:48 PM

You can look into the BitConverter class and its methods, for converting specific numbers of bits might just mean bitshifting values in order to obtain the appropriate information before passing it to the appropriate method (in the case of your provided example, ToIntxx() depending on the end resulting data Type you desire. It basically provides methods for almost every built in type.

Hope this helps. I'm looking for either a one method conversion, or a method to make one of my own. I'll update this thread if I find anything else in my own search.

[EDIT]Check out System.BitConverter Members for more info on what I referenced above.[/EDIT]

Sebastiani · 09-13-2009, 10:11 PM

You could use System.BitConverter, as cyreon suggested, and process 24 bits at a time, eg:

Code:

using System;

class Test
{
    static void Main( )
    {
        byte [ ]
            data = new byte[ ]
        {
            0x12, 
            0x34, 
            0x56, 
            0x12, 
            0x34, 
            0x56, 
            0x12, 
            0x34, 
            0x56, 
            0x12, 
            0x34, 
            0x56, 
        /*
            Padding, to prevent access violation
        */
            0x00
            
        };
    /*
        Special calculation needed due to padding
    */
        int
            limit = data.Length - ( data.Length % 3 );
        for( int index = 0; index < limit; index += 3 )
        {
            int
                buffer24 = BitConverter.ToInt32( data, index ) & 0x00ffffff,
                first12 = buffer24 & 0xfff, 
                second12 = ( buffer24 >> 12 );
            Console.Write( "first12 : 0x" + Convert.ToString( first12, 16 ).PadLeft( 3, '0' ) + "\n" );
            Console.Write( "second12: 0x" + Convert.ToString( second12, 16 ).PadLeft( 3, '0' ) + "\n" );
        /*
            Put first12 and second12 into an array or such
        */
        }
    }
}

08-20-2009, 01:44 PM	#1
kevins963 Registered User Join Date: Sep 2008 Posts: 4	C# Converting one datatype array to another I am trying to find a fast way to convert a byte array that stores 12 bit data into an integer array in CSharp. I compared using a for loop vs the Array.Copy() and there is a sigficant optimization when using the Array.Copy. Now I am trying to see if there is a similar function that you can use on more unique datatypes? The code I currently use to convert my 12 bit data into an integer is as follow: Code: index2 = 0; for(index = 0; index < 230; index+=2) { ecg_buffer[index] = (temp_buffer[index2] << 4) \| ((temp_buffer[index2+1] & 0xF0)>> 4); ecg_buffer[index+1] = ((temp_buffer[index2+1] & 0x0F) << 8) \| temp_buffer[index2+2]; index2+=3; } temp_buffer is a byte array that holds the 12 bit values, so every three bytes contain two 12-bit values. ecg_buffer contain the converted integer values Now is there an optimized function in CSharp that will convert every 12 bits to another datatype array? Thank you much, Kevin
kevins963 is offline

09-13-2009, 08:48 PM	#2
cyreon uh oh Join Date: Jan 2005 Location: Ontario, CA Posts: 66	You can look into the BitConverter class and its methods, for converting specific numbers of bits might just mean bitshifting values in order to obtain the appropriate information before passing it to the appropriate method (in the case of your provided example, ToIntxx() depending on the end resulting data Type you desire. It basically provides methods for almost every built in type. Hope this helps. I'm looking for either a one method conversion, or a method to make one of my own. I'll update this thread if I find anything else in my own search. [EDIT]Check out System.BitConverter Members for more info on what I referenced above.[/EDIT] Last edited by cyreon; 09-13-2009 at 08:54 PM.
cyreon is offline

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