private static string CalculateFullHash(FileInformationItem file)
{
byte[] buffer = new byte[4 * 1024];
byte[] runningHash = null;
using (FileStream fs = new FileStream(file.FullPath, FileMode.Open))
{
int read = fs.Read(buffer, 0, buffer.Length);
while (0 < read)
{
runningHash = null == runningHash ? CalculateRawHash(buffer, 0, read) : CalculateRawHash(Merge(runningHash, buffer), 0, runningHash.Length + read);
read = fs.Read(buffer, 0, buffer.Length);
}
}
return CalculateHash(buffer, 0, buffer.Length);
}
public static string CalculateHash(FileInformationItem file, HashMethod method)
{
if (HashMethod.Simple == method)
{
return CalculateSimpleHash(file);
}
else if (HashMethod.Lazy == method)
{
return CalculateLazyHash(file);
}
else if (HashMethod.Full == method)
{
return CalculateFullHash(file);
}
else
{
throw new ArgumentException();
}
}
private static string CalculateLazyHash(FileInformationItem file)
{
try
{
byte[] buffer = new byte[1024 * 8];
using (FileStream fs = new FileStream(file.FullPath, FileMode.Open))
{
int read = fs.Read(buffer, 0, buffer.Length);
return CalculateHash(buffer, 0, read);
}
}
catch (UnauthorizedAccessException)
{
return CalculateSimpleHash(file);
}
catch (IOException)
{
return CalculateSimpleHash(file);
}
}
private static string CalculateSimpleHash(FileInformationItem file)
{
return CalculateHash(file.LastChange.ToString() + file.Size.ToString());
}
private static string GetSingleLine(FileInformationItem item)
{
List<string> fields = new List<string>();
fields.Add(EscapeField(item.FileName));
fields.Add(EscapeField(item.Extension));
fields.Add(EscapeField(item.Hash));
fields.Add(EscapeField(item.FullPath));
fields.Add(EscapeField(item.Directory));
fields.Add(EscapeField(item.Size.ToString()));
fields.Add(EscapeField(item.Created.ToShortDateString()));
fields.Add(EscapeField(item.LastChange.ToShortDateString()));
fields.Add(EscapeField(item.LastOpen.ToShortDateString()));
fields.Add(EscapeField(ResolveBoolean(item.Hidden).ToString()));
fields.Add(EscapeField(ResolveBoolean(item.ReadOnly).ToString()));
return string.Join(";", fields.ToArray());
}
private void Scan(DirectoryInfo root)
{
FileInfo[] files = null;
try
{
files = root.GetFiles("*");
}
catch (UnauthorizedAccessException)
{
files = new FileInfo[0];
}
foreach (FileInfo file in files)
{
if (!this.shouldRun)
{
return;
}
if ((file.Attributes & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint && (file.Attributes & FileAttributes.System) != FileAttributes.System)
{
FileInformationItem item = new FileInformationItem(file);
item.Hash = HashFunctions.CalculateHash(item, this.hashMethod);
this.items.Add(item);
}
}
DirectoryInfo[] directories = null;
try
{
directories = root.GetDirectories();
}
catch (UnauthorizedAccessException)
{
directories = new DirectoryInfo[0];
}
foreach (DirectoryInfo newRoot in directories)
{
Scan(newRoot);
}
}