I need to use this class: Source: http://www.sanity-free.com/12/crc32_implementation_in_csharp.html
public class Crc32 {
uint[] table;
public uint ComputeChecksum(byte[] bytes) {
uint crc = 0xffffffff;
for(int i = 0; i < bytes.Length; ++i) {
byte index = (byte)(((crc) & 0xff) ^ bytes[i]);
crc = (uint)((crc >> 8) ^ table[index]);
}
return ~crc;
}
public byte[] ComputeChecksumBytes(byte[] bytes) {
return BitConverter.GetBytes(ComputeChecksum(bytes));
}
public Crc32() {
uint poly = 0xedb88320;
table = new uint[256];
uint temp = 0;
for(uint i = 0; i < table.Length; ++i) {
temp = i;
for(int j = 8; j > 0; --j) {
if((temp & 1) == 1) {
temp = (uint)((temp >> 1) ^ poly);
}else {
temp >>= 1;
}
}
table[i] = temp;
}
}
}
}
I have an array of bytes and I need to display the CRC32 checksum of that array in a text box as a hexadecimal representation when I press a button. For example:
byte [] my_bytes = {0xAA, 0xBB, 0xCC, 0x11, 0x22, 0x33};
textBox1.Text = // the checksum of my_bytes as hex
Can you please help with that as I am still new to programming.
Assuming I understand your question correctly, it's that you don't understand how to call a method within a class.
First you will need to instantiate your class into and object, then you can call the methods within the class.
byte [] myBytes = {0xAA, 0xBB, 0xCC, 0x11, 0x22, 0x33};
var crc32Instance = new Crc32();
var resultingBytes = crc32Instance.ComputeChecksumBytes(myBytes);
var byteString = String.Concat(Array.ConvertAll(resultingBytes , x => x.ToString("X2")));
textBox1.Text = byteString// the checksum of my_bytes as hex
I'd suggest looking at some beginner resources to better understand object oriented programming in C#.
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