private FileComparisonResult CompareStreams(IFileSystemFile source, IFileSystemFile destination)
{
using (Stream sourceStream = source.GetStream())
{
using (Stream destinationStream = destination.GetStream())
{
var sourceBuffer = new byte[this.BufferSize];
var destinationBuffer = new byte[this.BufferSize];
int sourceReadCount;
do
{
sourceReadCount = sourceStream.Read(sourceBuffer, 0, this.BufferSize);
int destinationReadCount = destinationStream.Read(destinationBuffer, 0, this.BufferSize);
if (sourceReadCount != destinationReadCount)
{
return FileComparisonResult.Differ;
}
for (int i = 0; i < sourceReadCount; i++)
{
if (sourceBuffer[i] != destinationBuffer[i])
{
return FileComparisonResult.Differ;
}
}
}
while (sourceReadCount > 0);
return FileComparisonResult.Same;
}
}
}
public FileComparisonResult Compare(IFileSystemFile source, IFileSystemFile destination)
{
if (source.Size != destination.Size)
{
return FileComparisonResult.Differ;
}
return CompareStreams(source, destination);
}
public string?Get(IFileSystemFile fileInfo)
{
if (!fileInfo.Exists)
{
return(null);
}
var extension = Path.GetExtension(fileInfo.Name);
if (string.IsNullOrEmpty(extension) || !_mimeTypes.ContainsKey(extension))
{
return(null);
}
return(_mimeTypes[extension]);
}
public string Get(IFileSystemFile fileInfo)
{
var byteBuffer = new byte[256];
using (var fileStream = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
if (fileStream.Length >= 256)
{
fileStream.Read(byteBuffer, 0, 256);
}
else
{
fileStream.Read(byteBuffer, 0, (int)fileStream.Length);
}
}
var extension = Path.GetExtension(fileInfo.Name) is null
? string.Empty
: Path.GetExtension(fileInfo.Name).ToUpper();
return(GetInternal(byteBuffer, extension));
}
public string?Get(IFileSystemFile fileInfo)
{
if (!fileInfo.Exists)
{
return(null);
}
var byteBuffer = new byte[256];
using (var fileStream = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
if (fileStream.Length >= 256)
{
fileStream.Read(byteBuffer, 0, 256);
}
else
{
fileStream.Read(byteBuffer, 0, (int)fileStream.Length);
}
}
FindMimeFromData(0, null, byteBuffer, 256, null, 0, out var MimeTypeNum, 0);
var mimeTypePtr = new IntPtr(MimeTypeNum);
var mimeTypeFromFile = Marshal.PtrToStringUni(mimeTypePtr);
Marshal.FreeCoTaskMem(mimeTypePtr);
if (string.IsNullOrEmpty(mimeTypeFromFile) ||
mimeTypeFromFile == "text/plain" ||
mimeTypeFromFile == "application/octet-stream")
{
return(null);
}
return(mimeTypeFromFile);
}
public string?Get(IFileSystemFile fileInfo)
{
if (!fileInfo.Exists)
{
return(null);
}
var extension = Path.GetExtension(fileInfo.Name);
using (var key = Registry.ClassesRoot.OpenSubKey(extension))
{
if (key is null)
{
return(null);
}
if (key.GetValue("Content Type") is null)
{
return(null);
}
return(key.GetValue("Content Type")?.ToString());
}
}
public FileComparisonResult Compare(IFileSystemFile source, IFileSystemFile destination)
{
return comparisonStrategy.Compare(source, destination);
}
