| public Update ( byte buffer, int offset, int count ) : void | ||
| buffer | byte | Contains the data to update the CRC with. |
| offset | int | The offset into the buffer where the data starts |
| count | int | The number of data bytes to update the CRC with. |
| Résultat | void | |
public void Update(byte[] buffer, int offset, int count)
{
if (buffer == null) {
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0) {
throw new ArgumentOutOfRangeException(nameof(offset), "cannot be less than zero");
}
if (offset >= buffer.Length) {
throw new ArgumentOutOfRangeException(nameof(offset), "not a valid index into buffer");
}
if (count < 0) {
throw new ArgumentOutOfRangeException(nameof(count), "cannot be less than zero");
}
if (offset + count > buffer.Length) {
throw new ArgumentOutOfRangeException(nameof(count), "exceeds buffer size");
}
for (int i = 0; i < count; ++i) {
Update(buffer[offset++]);
}
}
public static int Main(string[] args)
{
if (args.Length == 0) {
ShowHelp();
return 1;
}
var parser = new ArgumentParser(args);
if (!File.Exists(file_)) {
Console.Error.WriteLine("Cannot find file {0}", file_);
ShowHelp();
return 1;
}
using (FileStream checksumStream = File.OpenRead(file_)) {
byte[] buffer = new byte[4096];
int bytesRead;
switch (parser.Command) {
case Command.Help:
ShowHelp();
break;
case Command.Crc32:
var currentCrc = new Crc32();
while ((bytesRead = checksumStream.Read(buffer, 0, buffer.Length)) > 0) {
currentCrc.Update(buffer, 0, bytesRead);
}
Console.WriteLine("CRC32 for {0} is 0x{1:X8}", args[0], currentCrc.Value);
break;
case Command.BZip2:
var currentBZip2Crc = new BZip2Crc();
while ((bytesRead = checksumStream.Read(buffer, 0, buffer.Length)) > 0) {
currentBZip2Crc.Update(buffer, 0, bytesRead);
}
Console.WriteLine("BZip2CRC32 for {0} is 0x{1:X8}", args[0], currentBZip2Crc.Value);
break;
case Command.Adler:
var currentAdler = new Adler32();
while ((bytesRead = checksumStream.Read(buffer, 0, buffer.Length)) > 0) {
currentAdler.Update(buffer, 0, bytesRead);
}
Console.WriteLine("Adler32 for {0} is 0x{1:X8}", args[0], currentAdler.Value);
break;
}
}
return 0;
}
