public void TestComputeHash()
{
using (var imageStream = TestImage.Flora.GetStream())
using (var bmp = (Bitmap)Image.FromStream(imageStream))
{
var hash = BitmapHash.Compute(bmp);
Assert.NotNull(hash);
}
}
public void TestCompareCompressedPicture()
{
using (var imageStream1 = TestImage.Flora.GetStream())
using (var bmp1 = (Bitmap)Image.FromStream(imageStream1))
using (var imageStream2 = TestImage.FloraCompressed.GetStream())
using (var bmp2 = (Bitmap)Image.FromStream(imageStream2))
{
var hash1 = BitmapHash.Compute(bmp1);
var hash2 = BitmapHash.Compute(bmp2);
var diff = BinaryUtils.ComputeByteArrayEquality(hash1, hash2);
Assert.True(diff > 0.9);
}
}
public FileInformation Load(IFile file, Stream stream)
{
_logger.LogDebug("Load file information of {filename}", file.Filename);
PhotoProperties?properties;
Hash fileHash;
DateTimeOffset fileCreatedOn;
fileCreatedOn = GetCreationDate(stream, file);
stream.Position = 0;
try
{
using var bmp = new Bitmap(stream);
var width = bmp.Width;
var height = bmp.Height;
var bmpHash = new Hash(BitmapHash.Compute(bmp));
properties = new PhotoProperties(bmpHash, width, height);
}
catch (Exception)
{
properties = null;
}
stream.Position = 0;
fileHash = _fileHasher.ComputeHash(stream);
var fileInformation = new FileInformation(file.Filename, file.CreatedOn, file.ModifiedOn, fileHash, file.Length,
fileCreatedOn, properties, file.RelativeFilename);
_logger.LogDebug("FileInformation of file {filename} loaded: {@data}", file.Filename, fileInformation);
return(fileInformation);
}