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Extracting an Int from a Little Endian or Big Endian Byte Array

/ Published in: C#
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Found this in some code I've been maintaining/expanding. Quite clever.

Picture an array of bytes in binary

00000111 11100000 00000000 00000000

Now picture an Int32 in Binary
00000000000000000000000000000000

To grab a Little Endian Integer (16 bits) out of the array.

Take the second array element
11100000

Assign it to the Int32 variable
00000000000000000000000011100000

Bit shift it up by 8
00000000000000001110000000000000

Now OR it with the first Array element - could also just add.
<pre>
00000000000000001110000000000000
or 00000000000000000000000000000111
= 00000000000000001110000000000111
</pre>

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  1. public static Int32 GetInt32(byte[] buffer, int offset, EndianType byteOrder)
  2.         {
  3.             if (byteOrder == EndianType.LittleEndian)
  4.             {
  5.                 return buffer[offset + 1] << 8 | buffer[offset];
  6.             }
  7.             else
  8.             {
  9.                 return buffer[offset] << 8 | buffer[offset + 1];
  10.             } 
  11.         }

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