public void EncodeImage(IFileReader fileReader, IFileWriter fileWriter, IImagePredictor imagePredictor)
{
if (fileReader == null)
{
throw new ArgumentNullException(nameof(fileReader));
}
if (fileWriter == null)
{
throw new ArgumentNullException(nameof(fileWriter));
}
if (imagePredictor == null)
{
throw new ArgumentNullException(nameof(imagePredictor));
}
ValidateImageFromFileReader(fileReader);
GetImageFromFileReader(fileReader);
ImageCodes = new byte[OriginalImage.Width, OriginalImage.Height];
PredictionMatrix = new byte[OriginalImage.Width, OriginalImage.Height];
ErrorMatrix = new int[OriginalImage.Width, OriginalImage.Height];
UpdateImageCodes();
HandleFirstPixel();
HandleFirstColumn(imagePredictor);
HandleFirstRow(imagePredictor);
for (int row = 1; row < 256; row++)
{
for (int column = 1; column < 256; column++)
{
var a = ImageCodes[row - 1, column];
var b = ImageCodes[row, column - 1];
var c = ImageCodes[row - 1, column - 1];
var prediction = imagePredictor.PredictValue(a, b, c);
HandlePrediction(row, column, prediction);
}
}
CopyBitmapHeader(fileReader, fileWriter);
WriteUsedImagePredictor(fileWriter, imagePredictor);
errorMatrixWriter.WriteErrorMatrix(ErrorMatrix, fileWriter);
fileWriter.Flush();
}
public void EncodeFile(IFileReader fileReader, IFileWriter fileWriter, int bitsForOffset, int bitsForLength)
{
if (fileReader == null)
{
throw new ArgumentNullException(nameof(fileReader));
}
if (fileWriter == null)
{
throw new ArgumentNullException(nameof(fileWriter));
}
if (bitsForOffset < 3 || bitsForOffset > 15)
{
throw new ArgumentException($"{nameof(bitsForOffset)} should be between 3 and 15");
}
if (bitsForLength < 2 || bitsForLength > 7)
{
throw new ArgumentException($"{nameof(bitsForLength)} should be between 3 and 15");
}
if (Lz77Buffer.Length != bitsForLength || Lz77Buffer.Offset != bitsForOffset)
{
Lz77Buffer.SetOffsetAndLimit(bitsForLength, bitsForLength);
}
WriteHeader(fileWriter, bitsForOffset, bitsForLength);
TokensFromPreviousRun.Clear();
lz77BufferManager.TryToFillLookAheadBuffer(Lz77Buffer, fileReader);
while (Lz77Buffer.LookAheadBuffer.Count > 0)
{
var lz77Token = lz77TokenExtractor.GetLz77TokenFromLz77Buffer(Lz77Buffer);
lz77BufferManager.TryToFillSearchBufferBasedOnLz77Token(Lz77Buffer, lz77Token);
lz77BufferManager.EmptyLookAheadBufferBasedOnLz77Token(Lz77Buffer, lz77Token);
lz77BufferManager.TryToFillLookAheadBuffer(Lz77Buffer, fileReader);
lz77TokenWriter.WriteToken(lz77Token, fileWriter, bitsForOffset, bitsForLength);
TokensFromPreviousRun.Add(lz77Token);
}
fileWriter.Flush();
}
public void Encode(string sourceFilepath, string destinationFilepath, NearLosslessOptions nearLosslessOptions)
{
var image = GetImageOrThrow(sourceFilepath);
var imageMatrices = new ImageMatrices(image);
image.Dispose();
PredictionMatrixHelper.SetImageMatrices(imageMatrices, nearLosslessOptions);
fileReader.Open(sourceFilepath);
fileWriter.Open(destinationFilepath);
CopyBitmapHeader();
WriteOptions(nearLosslessOptions);
var errorMatrixWriter = NearLosslessErrorMatrixWriterSelector.GetErrorMatrixWriter(nearLosslessOptions.SaveMode);
errorMatrixWriter.WriteErrorMatrix(imageMatrices.QuantizedErrors, fileWriter);
fileWriter.Flush();
fileReader.Close();
fileWriter.Close();
}
public void TestPartialReadAll(string schemaStr, Codec.Type codecType)
{
// create and write out
IList <Foo> records = MakeRecords(GetTestFooObject());
MemoryStream dataFileOutputStream = new MemoryStream();
Schema schema = Schema.Parse(schemaStr);
DatumWriter <Foo> writer = new SpecificWriter <Foo>(schema);
int numRecords = 0;
List <SyncLog> syncLogs = new List <SyncLog>();
using (IFileWriter <Foo> dataFileWriter = DataFileWriter <Foo> .OpenWriter(writer, dataFileOutputStream, Codec.CreateCodec(codecType)))
{
dataFileWriter.Flush();
syncLogs.Add(new SyncLog {
Position = dataFileOutputStream.Position - DataFileConstants.SyncSize + 1, RemainingRecords = numRecords
});
long lastPosition = dataFileOutputStream.Position;
for (int i = 0; i < 10; ++i)
{
foreach (Foo foo in records)
{
dataFileWriter.Append(foo);
if (dataFileOutputStream.Position != lastPosition)
{
syncLogs.Add(new SyncLog {
Position = dataFileOutputStream.Position - DataFileConstants.SyncSize + 1, RemainingRecords = numRecords
});
lastPosition = dataFileOutputStream.Position;
}
numRecords++;
}
// write out block
if (i == 1 || i == 4)
{
dataFileWriter.Sync();
syncLogs.Add(new SyncLog {
Position = dataFileOutputStream.Position - DataFileConstants.SyncSize + 1, RemainingRecords = numRecords
});
lastPosition = dataFileOutputStream.Position;
}
}
dataFileWriter.Flush();
syncLogs.Add(new SyncLog {
Position = dataFileOutputStream.Position, RemainingRecords = numRecords
});
}
MemoryStream dataFileInputStream = new MemoryStream(dataFileOutputStream.ToArray());
// read back
using (IFileReader <Foo> reader = DataFileReader <Foo> .OpenReader(dataFileInputStream))
{
long curPosition = 0;
foreach (SyncLog syncLog in syncLogs)
{
int expectedRecords = numRecords - syncLog.RemainingRecords;
long nextSyncPoint = syncLog.Position;
AssertNumRecordsFromPosition(reader, curPosition, expectedRecords);
AssertNumRecordsFromPosition(reader, nextSyncPoint - 1, expectedRecords);
curPosition = nextSyncPoint;
}
}
}
public void Log <TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func <TState, Exception, string> formatter)
{
if (!IsEnabled(logLevel))
{
return;
}
var stateValues = state as IEnumerable <KeyValuePair <string, object> >;
string formattedMessage = formatter?.Invoke(state, exception);
// If we don't have a message, there's nothing to log.
if (string.IsNullOrEmpty(formattedMessage))
{
return;
}
bool isSystemTrace = Utility.GetStateBoolValue(stateValues, ScriptConstants.LogPropertyIsSystemLogKey);
if (isSystemTrace)
{
// System traces are not logged to files.
return;
}
bool isPrimaryHostTrace = Utility.GetStateBoolValue(stateValues, ScriptConstants.LogPropertyPrimaryHostKey);
if (isPrimaryHostTrace && !_isPrimary())
{
return;
}
if (exception != null)
{
if (exception is FunctionInvocationException ||
exception is AggregateException)
{
// we want to minimize the stack traces for function invocation
// failures, so we drill into the very inner exception, which will
// be the script error
Exception actualException = exception;
while (actualException.InnerException != null)
{
actualException = actualException.InnerException;
}
formattedMessage += $"{Environment.NewLine}{actualException.Message}";
}
else
{
formattedMessage += $"{Environment.NewLine}{exception.ToFormattedString()}";
}
}
formattedMessage = FormatLine(stateValues, logLevel, formattedMessage);
try
{
_fileWriter.AppendLine(formattedMessage);
// flush errors immediately
if (logLevel == LogLevel.Error || exception != null)
{
_fileWriter.Flush();
}
}
catch (Exception)
{
// Make sure the Logger doesn't throw if there are Exceptions (disk full, etc).
}
}
public void EncodeFile(IFileReader fileReader, IFileWriter fileWriter, OnFullDictionaryOption onFullDictionaryOption, int numberOfBitsIndex)
{
if (fileReader == null)
{
throw new ArgumentNullException(nameof(fileReader));
}
if (fileWriter == null)
{
throw new ArgumentNullException(nameof(fileWriter));
}
if (numberOfBitsIndex < 9 || numberOfBitsIndex > 15)
{
throw new ArgumentException($"{nameof(numberOfBitsIndex)} must be at least 9, and at most 15");
}
WriteHeader(fileWriter, onFullDictionaryOption, numberOfBitsIndex);
IndexesFromLastRun.Clear();
LzWDictionary = new LzWDictionary((int)Math.Pow(2, numberOfBitsIndex) - 1, onFullDictionaryOption);
var lastCharacter = (char)fileReader.ReadBits(8);
var shouldStop = false;
while (true)
{
var currentString = lastCharacter.ToString();
uint lastIndex = 0;
if (shouldStop)
{
break;
}
while (true)
{
if (LzWDictionary.ContainsString(currentString))
{
lastIndex = LzWDictionary.GetIndexByString(currentString);
if (shouldStop)
{
fileWriter.WriteValueOnBits(lastIndex, (byte)numberOfBitsIndex);
IndexesFromLastRun.Add(lastIndex);
break;
}
}
else
{
LzWDictionary.Add(currentString);
fileWriter.WriteValueOnBits(lastIndex, (byte)numberOfBitsIndex);
IndexesFromLastRun.Add(lastIndex);
break;
}
if (!fileReader.ReachedEndOfFile)
{
var readByte = (byte)fileReader.ReadBits(8);
currentString += (char)readByte;
lastCharacter = (char)readByte;
}
else
{
shouldStop = true;
}
}
}
fileWriter.Flush();
}
public void FlushBuffer()
{
FileWriter?.Flush();
}
