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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. public class Test
  7. {
  8.         class _BitConverter
  9.         {
  10.             private Byte[] tmpfor_1ByteToInt32 = new Byte[4];
  11.             private Byte[] tmpfor_2ByteToInt32 = new Byte[4];
  12.             private Byte[] tmpfor_3ByteToInt32 = new Byte[4];
  13.  
  14.             private static Int32 generalToInt32(Byte[] bytes, int bitsCount)
  15.             {
  16.                 Int32 shiftCount = 32 - bitsCount;
  17.  
  18.                 UInt32 ui = BitConverter.ToUInt32(bytes, 0);
  19.                 UInt32 ui2 = ui << shiftCount;
  20.                 Int32 i = (Int32)(ui2);
  21.                 Int32 i2 = i >> shiftCount;
  22.                 return i2;
  23.             }
  24.  
  25.             public Int32 C1ByteToInt32(Byte[] bytes, int startIndex)
  26.             {
  27.                 tmpfor_1ByteToInt32[0] = bytes[0 + startIndex];
  28.                 return generalToInt32(tmpfor_1ByteToInt32, 8);
  29.             }
  30.  
  31.             public Int32 C2ByteToInt32(Byte[] bytes, int startIndex)
  32.             {
  33.                 tmpfor_2ByteToInt32[0] = bytes[0 + startIndex];
  34.                 tmpfor_2ByteToInt32[1] = bytes[1 + startIndex];
  35.                 return generalToInt32(tmpfor_2ByteToInt32, 16);
  36.             }
  37.  
  38.             public Int32 C3ByteToInt32(Byte[] bytes, int startIndex)
  39.             {
  40.                 tmpfor_3ByteToInt32[0] = bytes[0 + startIndex];
  41.                 tmpfor_3ByteToInt32[1] = bytes[1 + startIndex];
  42.                 tmpfor_3ByteToInt32[2] = bytes[2 + startIndex];
  43.                 return generalToInt32(tmpfor_3ByteToInt32, 24);
  44.             }
  45.         }
  46.  
  47.         public static void Main(string[] args)
  48.         {
  49.             var converter = new _BitConverter();
  50.             Console.WriteLine(converter.C1ByteToInt32(new byte[] { 0xCC, 0xCC, 0xFE, 0xFF, 0x80 }, 3));
  51.             Console.WriteLine(converter.C2ByteToInt32(new byte[] { 0xCC, 0xCC, 0xFE, 0xFF, 0x80 }, 2));
  52.             Console.WriteLine(converter.C3ByteToInt32(new byte[] { 0xCC, 0xCC, 0xFE, 0xFF, 0x80 }, 2));
  53.         }
  54. }
Success #stdin #stdout 0.03s 37008KB
comments (?)
stdin 
Standard input is empty
stdout 
-1
-2
-8323074
https://ideone.com/4Vrez
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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