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  1.         // Converts an array of bytes into an int.
  2.         unsafe public static int ToInt32(byte[] value, int startIndex)
  3.         {
  4.             if (value == null) {
  5.                 ThrowHelper.ThrowArgumentNullException(ExceptionArgument.value);
  6.             }
  7.  
  8.             if ((uint)startIndex >= value.Length) {
  9.                 ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.startIndex, ExceptionResource.ArgumentOutOfRange_Index);
  10.             }
  11.  
  12.             if (startIndex > value.Length - 4) {
  13.                 ThrowHelper.ThrowArgumentException(ExceptionResource.Arg_ArrayPlusOffTooSmall);
  14.             }
  15.  
  16.             fixed (byte* pbyte = &value[startIndex]) {
  17.                 if (startIndex % 4 == 0) {
  18.                     // data is aligned
  19.                     return *((int*)pbyte);
  20.                 }
  21.                 else {
  22.                     if (IsLittleEndian) {
  23.                         return (*pbyte) | (*(pbyte + 1) << 8) | (*(pbyte + 2) << 16) | (*(pbyte + 3) << 24);
  24.                     }
  25.                     else {
  26.                         return (*pbyte << 24) | (*(pbyte + 1) << 16) | (*(pbyte + 2) << 8) | (*(pbyte + 3));
  27.                     }
  28.                 }
  29.             }
  30.         }
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https://ideone.com/zZGA1
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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