48 lines
1.7 KiB
C#
48 lines
1.7 KiB
C#
using System;
|
|
using Crc;
|
|
|
|
namespace libsharperang {
|
|
public class DataTransforms {
|
|
/*public class CrcSum : Crc32Base {
|
|
public uint CrcKey;
|
|
public CrcSum(uint Mangled, uint Key) : base(0x04c11db7, Mangled, 0xffffffff, true, true) => CrcKey=Key;
|
|
}
|
|
|
|
public CrcSum CRC;*/
|
|
public CRC32 hasher;
|
|
private uint MagicNumber=0x35769521;
|
|
//public bool IsCrcInitialised() => (CRC!=null);
|
|
public bool IsCrcInitialised() => (hasher!=null && hasher.Initialised);
|
|
//public void InitialiseCrc() => CRC=new CrcSum(Bludgeon(0x77c40d4d^0x35769521), 0x77c40d4d);
|
|
//public void InitialiseCrc(uint Key) => CRC=new CrcSum(Bludgeon(Key), Key);
|
|
public void InitialiseCrc(uint Key=0x35769521) {
|
|
if (hasher==null || (hasher.Initialised && hasher.Initial != Key)) hasher=new CRC32(Key);
|
|
Console.WriteLine("{0:X}", hasher.Initial);
|
|
hasher.Initialise();
|
|
}
|
|
public byte[] GetHashSum(byte[] data) {
|
|
if (!IsCrcInitialised()) InitialiseCrc();
|
|
//return CRC.ComputeHash(data);
|
|
return BitConverter.GetBytes(hasher.GetChecksum(data));
|
|
}
|
|
public uint GetCrcKey() {
|
|
if (!IsCrcInitialised()) InitialiseCrc();
|
|
//return CRC.CrcKey;
|
|
return hasher.Initial == MagicNumber? hasher.Initial : hasher.Initial ^ MagicNumber;
|
|
}
|
|
public byte[] GetCrcKeyBytes() {
|
|
if (!IsCrcInitialised()) InitialiseCrc();
|
|
return BitConverter.GetBytes(GetCrcKey());
|
|
}
|
|
public byte[] GeneratePrintOpcode(byte[] data) => BitConverter.GetBytes(SwapEndianness(
|
|
0x00010000 | (((((
|
|
(uint)data.Length & 0xFFU) << 16) |
|
|
(uint)data.Length) & 0xFFFF00U) >> 8)));
|
|
public uint SwapEndianness(uint value) => (
|
|
(value & 0x000000FFU) << 24) |
|
|
((value & 0x0000FF00U) << 8) |
|
|
((value & 0x00FF0000U) >> 8) |
|
|
((value & 0xFF000000U) >> 24);
|
|
}
|
|
}
|