//Refactoring OK++
public async Task<DiffStampAdapter> TryMakeDiffStamp(
FileEntityAggregator targetFile,
String diffStampDescription)
{
//Download source file
IO.MemoryStream fileMemoryStream = await TryDownloadFileToStream(targetFile);
if (fileMemoryStream == default(IO.MemoryStream))
{
//Failed to download
return default(DiffStampAdapter);
}
else
{
//Download present diff stamps
List<DiffStampAdapter> diffStamps = await TryDownloadAllDiffstampsForFile(targetFile); //OK
//Apply all of them (memory hungry section)
Byte[] latestData = fileMemoryStream.ToArray();
fileMemoryStream.Dispose(); //As there is a temp stream to apply patches
foreach (DiffStampAdapter diffStamp in diffStamps)
{
using (IO.MemoryStream outputStream = new IO.MemoryStream())
{
using (IO.MemoryStream currentPatchedMemoryStream = new IO.MemoryStream(latestData))
{
//Apply a patch
BinaryPatchUtility.Apply(
currentPatchedMemoryStream,
diffStamp.OpenMemoryStreamForPatching,
outputStream);
//Prepare applied data for next iteration patching
outputStream.Position = 0;
latestData = outputStream.ToArray();
}
}
}
//When all patches are applied, make new one with the difference between last on cloud and on PC
IO.FileStream fileStream = default(IO.FileStream);
IO.MemoryStream latestPatchMemoryStream = new IO.MemoryStream();
DiffStampAdapter resultPatch = default(DiffStampAdapter);
try
{
//Read a file to byte array
fileStream = new IO.FileStream(targetFile.LocalFilePath, IO.FileMode.Open);
Byte[] lastFromUserPC = new Byte[fileStream.Length];
fileStream.Read(lastFromUserPC, 0, Convert.ToInt32(fileStream.Length));
//Get bytes from latest patched from cloud
BinaryPatchUtility.Create(latestData, lastFromUserPC, latestPatchMemoryStream);
//Create new binary patch instance
resultPatch = new DiffStampAdapter(
latestPatchMemoryStream.ToArray(),
diffStampDescription,
DateTime.Now);
}
catch (Exception)
{
//Patching failed
}
finally
{
fileStream.Dispose();
latestPatchMemoryStream.Dispose();
}
return resultPatch;
}
}
//Refactoring OK++
public async Task<FileEntityAggregator> TryUploadDiffStampForFileAsync(
FileEntityAggregator targetFile,
DiffStampAdapter diffStamp)
{
DriveService driveService = await TryGetAuthorizer();
//Instantiate file entity
File fileToUpload = new File
{
Title = String.Format("{0}.{1}", diffStamp.Description, BsdiffStampExtension),
Parents = new ParentReference[] { new ParentReference { Id = targetFile.GoogleDriveParentId } }
};
//Instantiate request
IUploadProgress uploadProgress = default(IUploadProgress);
FileEntityAggregator result = default(FileEntityAggregator);
using (IO.MemoryStream uploadFileStream = new IO.MemoryStream())
{
BinaryFormatter binaryFormatter = new BinaryFormatter();
binaryFormatter.Serialize(uploadFileStream, diffStamp);
uploadFileStream.Position = 0;
var insertUploadRequest = driveService.Files.Insert(
fileToUpload, uploadFileStream, BsdiffStampMIMEType);
insertUploadRequest.ChunkSize = FilesResource.InsertMediaUpload.MinimumChunkSize * 2;
//Start uploading task
uploadProgress = await insertUploadRequest.UploadAsync();
//Return data according to upload completion state
if (uploadProgress.Status == UploadStatus.Completed)
{
result = new FileEntityAggregator
{
LocalFilePath = String.Empty,
GoogleDriveId = insertUploadRequest.ResponseBody.Id,
GoogleDrivePath = insertUploadRequest.ResponseBody.DownloadUrl,
GoogleDriveParentId = targetFile.GoogleDriveParentId,
MIMEType = BsdiffStampMIMEType
};
}
else
{
result = default(FileEntityAggregator);
}
}
return result;
}
