public static uint GetFileCRC32(string path, ref long byteCount, BackgroundWorker bw)
{
if (String.IsNullOrEmpty(path))
throw new ArgumentNullException("path");
Crc32 crc32 = new Crc32();
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
{
byte[] buffer = new byte[4096];
int bytesRead = 0;
long size = fs.Length;
long totalBytesRead = 0;
int ticks = 0;
while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) != 0)
{
ticks++;
totalBytesRead += bytesRead;
byteCount += bytesRead;
crc32.Update(buffer, 0, bytesRead);
if (bw != null && ticks == 10) // Only report once every 10 loops so we dont hose the CPU
{
bw.ReportProgress((int)((double)totalBytesRead * 100 / size));
ticks = 0;
}
}
}
return crc32.Value;
}
public static uint GetStreamCRC32(Stream stream)
{
if (stream == null)
throw new ArgumentNullException("stream");
if (!stream.CanRead)
throw new ArgumentException("stream is not readable.");
Crc32 crc32 = new Crc32();
byte[] buffer = new byte[4096];
int bytesRead = 0;
stream.Position = 0;
while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) != 0)
{
crc32.Update(buffer, 0, bytesRead);
}
stream.Position = 0;
return crc32.Value;
}
