/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
var inflater = new Inflater(noHeader: false);
Span <byte> destination = output.Span;
while (!destination.IsEmpty)
{
int bytesWritten = inflater.Inflate(destination);
if (inflater.IsFinished)
{
break;
}
if (inflater.IsNeedingInput)
{
if (input.IsEmpty)
{
throw new InvalidDataException();
}
inflater.SetInput(input);
input = default;
}
else if (bytesWritten == 0)
{
throw new InvalidDataException();
}
destination = destination.Slice(bytesWritten);
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
if (inputSpan.IsEmpty)
{
return;
}
byte first = inputSpan[0];
if (first == 0)
{
DecompressLeastSignificantBitFirst(inputSpan, scanlinesBufferSpan);
}
else if (first == 128)
{
DecompressMostSignificantBitFirst(inputSpan, scanlinesBufferSpan);
}
else
{
throw new InvalidDataException();
}
}
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
// Copy frame header
JpegFrameHeader frameHeader = _frameHeader;
frameHeader = new JpegFrameHeader(frameHeader.SamplePrecision, (ushort)context.ImageSize.Height, (ushort)context.ImageSize.Width, frameHeader.NumberOfComponents, frameHeader.Components);
var decoder = new JpegDecoder();
decoder.StartOfFrame = JpegMarker.StartOfFrame0;
decoder.MemoryPool = context.MemoryPool;
decoder.SetFrameHeader(frameHeader);
decoder.SetRestartInterval(_restartInterval);
foreach (ComponentInfo componentInfo in _components)
{
decoder.SetQuantizationTable(componentInfo.QuantizationTable);
decoder.SetHuffmanTable(componentInfo.DcTable);
decoder.SetHuffmanTable(componentInfo.AcTable);
}
var outputWriter = new JpegBuffer8BitOutputWriter(context.ImageSize.Width, context.SkippedScanlines, context.SkippedScanlines + context.RequestedScanlines, decoder.NumberOfComponents, output);
decoder.SetOutputWriter(outputWriter);
var reader = new JpegReader(input);
decoder.ProcessScan(ref reader, _scanHeader);
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
int bytesPerScanline = context.BytesPerScanline;
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
int totalScanlines = context.SkippedScanlines + context.RequestedScanlines;
for (int i = 0; i < totalScanlines; i++)
{
if (scanlinesBufferSpan.Length < bytesPerScanline)
{
throw new ArgumentException("destination too short.", nameof(output));
}
Span <byte> scanline = scanlinesBufferSpan.Slice(0, bytesPerScanline);
scanlinesBufferSpan = scanlinesBufferSpan.Slice(bytesPerScanline);
int unpacked = 0;
while (unpacked < bytesPerScanline)
{
sbyte n = (sbyte)inputSpan[0];
inputSpan = inputSpan.Slice(1);
if (n >= 0)
{
inputSpan.Slice(0, n + 1).CopyTo(scanline);
inputSpan = inputSpan.Slice(n + 1);
scanline = scanline.Slice(n + 1);
unpacked += n + 1;
}
else if (n != -128)
{
byte v = inputSpan[0];
inputSpan = inputSpan.Slice(1);
scanline.Slice(0, 1 - n).Fill(v);
scanline = scanline.Slice(1 - n);
unpacked += 1 - n;
}
}
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("T6 compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 1)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
bool whiteIsZero = context.PhotometricInterpretation == TiffPhotometricInterpretation.WhiteIsZero;
int width = context.ImageSize.Width;
int height = context.SkippedScanlines + context.RequestedScanlines;
var bitReader = new BitReader(inputSpan, higherOrderBitsFirst: _higherOrderBitsFirst);
ReferenceScanline referenceScanline = new ReferenceScanline(whiteIsZero, width);
// Process every scanline
for (int i = 0; i < height; i++)
{
Span <byte> scanline = scanlinesBufferSpan.Slice(0, width);
scanlinesBufferSpan = scanlinesBufferSpan.Slice(width);
Decode2DScanline(ref bitReader, whiteIsZero, referenceScanline, scanline);
referenceScanline = new ReferenceScanline(whiteIsZero, scanline);
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
input.CopyTo(output);
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("ThunderScan compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 4)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
ReadOnlySpan <sbyte> twoBitDiffs = MemoryMarshal.Cast <byte, sbyte>(TwoBitDiffDecodeTable);
ReadOnlySpan <sbyte> threeBitDiffs = MemoryMarshal.Cast <byte, sbyte>(ThreeBitDiffDecodeTable);
ReadOnlySpan <byte> inputSpan = input.Span;
OutputWriter writer = new OutputWriter(output.Span, context.ImageSize.Width, context.ImageSize.Height);
int delta;
uint lastPixel = 0;
ulong buffer = 0;
uint bufferCount = 0;
for (int i = 0; i < inputSpan.Length; i++)
{
uint inputByte = inputSpan[i];
switch (inputByte & 0b11_000000)
{
case 0b00_000000:
for (uint j = 0; j < inputByte; j++)
{
if (bufferCount == 16)
{
writer.Write(buffer, 16);
bufferCount = 0;
}
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
break;
case 0b01_000000:
if (bufferCount > (16 - 3))
{
writer.Write(buffer, bufferCount);
bufferCount = 0;
}
if ((delta = (int)((inputByte >> 4) & 0b11)) != 0b10)
{
lastPixel = (uint)((int)lastPixel + twoBitDiffs[delta]) & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
if ((delta = (int)((inputByte >> 2) & 0b11)) != 0b10)
{
lastPixel = (uint)((int)lastPixel + twoBitDiffs[delta]) & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
if ((delta = (int)(inputByte & 0b11)) != 0b10)
{
lastPixel = (uint)((int)lastPixel + twoBitDiffs[delta]) & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
break;
case 0b10_000000:
if (bufferCount > (16 - 2))
{
writer.Write(buffer, bufferCount);
bufferCount = 0;
}
if ((delta = (int)((inputByte >> 3) & 0b111)) != 0b100)
{
lastPixel = (uint)((int)lastPixel + threeBitDiffs[delta]) & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
if ((delta = (int)(inputByte & 0b111)) != 0b100)
{
lastPixel = (uint)((int)lastPixel + threeBitDiffs[delta]) & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
}
break;
case 0b11_000000:
if (bufferCount == 16)
{
writer.Write(buffer, 16);
bufferCount = 0;
}
lastPixel = inputByte & 0b1111;
buffer = (buffer << 4) | lastPixel;
bufferCount++;
break;
}
}
if (bufferCount != 0)
{
writer.Write(buffer, bufferCount);
}
if (!writer.RemainingSpan.IsEmpty)
{
writer.RemainingSpan.Clear();
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("ThunderScan compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 2)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
int width = context.ImageSize.Width;
int height = context.SkippedScanlines + context.RequestedScanlines;
int bytesPerScanline = context.BytesPerScanline;
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> outputSpan = output.Span;
for (int row = 0; row < height; row++)
{
if (inputSpan.IsEmpty)
{
ThrowMoreDataIsExpected();
}
Span <byte> scanline = outputSpan.Slice(0, bytesPerScanline);
outputSpan = outputSpan.Slice(bytesPerScanline);
int leadingByte = inputSpan[0];
if (leadingByte == 0x00)
{
// Literal row
inputSpan = inputSpan.Slice(1);
if (inputSpan.Length < scanline.Length)
{
ThrowMoreDataIsExpected();
}
inputSpan.Slice(0, scanline.Length).CopyTo(scanline);
inputSpan = inputSpan.Slice(scanline.Length);
}
else if (leadingByte == 0x40)
{
// Literal span
if (inputSpan.Length < 5)
{
ThrowMoreDataIsExpected();
}
int offset = BinaryPrimitives.ReadUInt16BigEndian(inputSpan.Slice(1));
int count = BinaryPrimitives.ReadUInt16BigEndian(inputSpan.Slice(3));
inputSpan = inputSpan.Slice(5);
if (inputSpan.Length < count)
{
ThrowMoreDataIsExpected();
}
if (offset > scanline.Length || (offset + count) > scanline.Length)
{
throw new InvalidDataException("Incorrect offset and count for literal span.");
}
scanline.Slice(0, offset).Fill(0xff);
inputSpan.Slice(0, count).CopyTo(scanline.Slice(offset, count));
scanline.Slice(offset + count).Fill(0xff);
inputSpan = inputSpan.Slice(count);
}
else
{
// RLE
var writer = new RunLengthWriter(scanline, width);
while (!writer.IsEndOfLine)
{
if (inputSpan.IsEmpty)
{
ThrowMoreDataIsExpected();
}
writer.WriteRunLength(inputSpan[0]);
inputSpan = inputSpan.Slice(1);
}
}
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("T4 compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 1)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
bool whiteIsZero = context.PhotometricInterpretation == TiffPhotometricInterpretation.WhiteIsZero;
int width = context.ImageSize.Width;
int height = context.SkippedScanlines + context.RequestedScanlines;
var bitReader = new BitReader(inputSpan, higherOrderBitsFirst: _higherOrderBitsFirst);
// Skip the first EOL code
if (bitReader.Peek(12) == 0b000000000001) // EOL code is 000000000001 (12bits).
{
bitReader.Advance(12);
}
else if (bitReader.Peek(16) == 1) // Or EOL code is zero filled.
{
bitReader.Advance(16);
}
// Process every scanline
for (int i = 0; i < height; i++)
{
if (scanlinesBufferSpan.Length < width)
{
throw new InvalidDataException();
}
Span <byte> scanline = scanlinesBufferSpan.Slice(0, width);
scanlinesBufferSpan = scanlinesBufferSpan.Slice(width);
// Process every code word in this scanline
byte fillValue = whiteIsZero ? (byte)0 : (byte)255;
CcittDecodingTable currentTable = CcittDecodingTable.WhiteInstance;
CcittDecodingTable otherTable = CcittDecodingTable.BlackInstance;
int unpacked = 0;
CcittCodeValue tableEntry;
while (true)
{
uint value = bitReader.Peek(16);
if (!currentTable.TryLookup(value, out tableEntry))
{
throw new InvalidDataException();
}
if (tableEntry.IsEndOfLine)
{
// fill the rest of scanline
scanline.Fill(fillValue);
bitReader.Advance(tableEntry.BitsRequired);
break;
}
// Check to see whether we are encountering a "filled" EOL ?
if ((value & 0b1111111111110000) == 0)
{
// Align to 8 bits
int filledBits = 8 - (bitReader.ConsumedBits + 12) % 8;
if (bitReader.Peek(filledBits) != 0)
{
throw new InvalidDataException();
}
// Confirm it is indeed an EOL code.
value = bitReader.Read(filledBits + 12);
if (value == 0b000000000001)
{
// fill the rest of scanline
scanline.Fill(fillValue);
break;
}
throw new InvalidDataException();
}
// Process normal code.
int runLength = tableEntry.RunLength;
scanline.Slice(0, runLength).Fill(fillValue);
scanline = scanline.Slice(runLength);
unpacked += runLength;
bitReader.Advance(tableEntry.BitsRequired);
// Terminating code is met. Switch to the other color.
if (tableEntry.IsTerminatingCode)
{
fillValue = (byte)~fillValue;
CcittHelper.SwapTable(ref currentTable, ref otherTable);
// This line is fully unpacked. Should exit and process next line.
if (unpacked == width)
{
// If this is the last line of the image, we don't process any code after this.
if (i == height - 1)
{
break;
}
// Is the next code word EOL ?
value = bitReader.Peek(16);
if ((value >> 4) == 0b000000000001)
{
// Skip the EOL code
bitReader.Advance(12);
break;
}
// Maybe the EOL is zero filled? First align to 8 bits
int filledBits = 8 - (bitReader.ConsumedBits + 12) % 8;
if (bitReader.Peek(filledBits) != 0)
{
bitReader.AdvanceAlignByte();
break;
}
// Confirm it is indeed an EOL code.
value = bitReader.Peek(filledBits + 12);
if (value == 0b000000000001)
{
bitReader.Advance(filledBits + 12);
}
bitReader.AdvanceAlignByte();
break;
}
}
}
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("T4 compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 1)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
bool whiteIsZero = context.PhotometricInterpretation == TiffPhotometricInterpretation.WhiteIsZero;
int width = context.ImageSize.Width;
int height = context.SkippedScanlines + context.RequestedScanlines;
var bitReader = new BitReader(inputSpan, _higherOrderBitsFirst);
ReferenceScanline referenceScanline = default;
// Process every scanline
for (int i = 0; i < height; i++)
{
if (scanlinesBufferSpan.Length < width)
{
throw new InvalidDataException();
}
Span <byte> scanline = scanlinesBufferSpan.Slice(0, width);
scanlinesBufferSpan = scanlinesBufferSpan.Slice(width);
// Read the first EOL.
if (bitReader.Peek(12) == 0b000000000001) // EOL code is 000000000001 (12bits).
{
bitReader.Advance(12);
}
else // Or EOL code is zero filled.
{
// Align to 8 bits
int filledBits = 8 - (bitReader.ConsumedBits + 12) % 8;
if (bitReader.Peek(filledBits) != 0)
{
throw new InvalidDataException();
}
// Confirm it is indeed an EOL code.
int value = (int)bitReader.Read(filledBits + 12);
if (value != 0b000000000001)
{
throw new InvalidDataException();
}
}
// Determine the type of this line (1d vs 2d)
bool is1D = bitReader.Read(1) != 0;
if (is1D)
{
Decode1DScanline(ref bitReader, whiteIsZero, scanline);
}
else
{
if (referenceScanline.IsEmpty)
{
throw new InvalidDataException();
}
Decode2DScanline(ref bitReader, whiteIsZero, referenceScanline, scanline);
}
referenceScanline = new ReferenceScanline(whiteIsZero, scanline);
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.PhotometricInterpretation != TiffPhotometricInterpretation.WhiteIsZero && context.PhotometricInterpretation != TiffPhotometricInterpretation.BlackIsZero)
{
throw new NotSupportedException("Modified Huffman compression does not support this photometric interpretation.");
}
if (context.BitsPerSample.Count != 1 || context.BitsPerSample[0] != 1)
{
throw new NotSupportedException("Unsupported bits per sample.");
}
ReadOnlySpan <byte> inputSpan = input.Span;
Span <byte> scanlinesBufferSpan = output.Span;
bool whiteIsZero = context.PhotometricInterpretation == TiffPhotometricInterpretation.WhiteIsZero;
int width = context.ImageSize.Width;
int height = context.SkippedScanlines + context.RequestedScanlines;
var bitReader = new BitReader(inputSpan, higherOrderBitsFirst: _higherOrderBitsFirst);
// Process every scanline
for (int i = 0; i < height; i++)
{
if (scanlinesBufferSpan.Length < width)
{
throw new InvalidDataException();
}
Span <byte> scanline = scanlinesBufferSpan.Slice(0, width);
scanlinesBufferSpan = scanlinesBufferSpan.Slice(width);
// Process every code word in this scanline
byte fillValue = whiteIsZero ? (byte)0 : (byte)255;
CcittDecodingTable currentTable = CcittDecodingTable.WhiteInstance;
CcittDecodingTable otherTable = CcittDecodingTable.BlackInstance;
int unpacked = 0;
while (true)
{
if (!currentTable.TryLookup(bitReader.Peek(16), out CcittCodeValue tableEntry))
{
throw new InvalidDataException();
}
if (tableEntry.IsEndOfLine)
{
// EOL code is not used in modified huffman algorithm
throw new InvalidDataException();
}
// Process normal code.
int runLength = tableEntry.RunLength;
scanline.Slice(0, runLength).Fill(fillValue);
scanline = scanline.Slice(runLength);
unpacked += runLength;
bitReader.Advance(tableEntry.BitsRequired);
// Terminating code is met. Switch to the other color.
if (tableEntry.IsTerminatingCode)
{
fillValue = (byte)~fillValue;
CcittHelper.SwapTable(ref currentTable, ref otherTable);
// This line is fully unpacked. Should exit and process next line.
if (unpacked == width)
{
break;
}
}
}
bitReader.AdvanceAlignByte();
}
}
/// <inheritdoc />
public void Decompress(TiffDecompressionContext context, ReadOnlyMemory <byte> input, Memory <byte> output)
{
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
// Identify this block
JpegDecoder decoder = Interlocked.Exchange(ref _decoder, null) ?? LoadJpegDecoder();
decoder.MemoryPool = context.MemoryPool;
decoder.SetInput(input);
decoder.Identify();
// Validate we are capable of decoding this.
TiffSize outputBufferSize = context.ImageSize;
if (decoder.Width < outputBufferSize.Width || decoder.Height < outputBufferSize.Height)
{
throw new InvalidDataException("Image dimension is too small.");
}
// Check number of components
if (decoder.NumberOfComponents != _numberOfComponents)
{
throw new InvalidDataException($"Expect {_numberOfComponents} components, but got {decoder.NumberOfComponents} components in the JPEG stream.");
}
JpegBlockOutputWriter outputWriter;
if (decoder.Precision == 8)
{
if (context.BitsPerSample.GetFirstOrDefault() != 8)
{
throw new InvalidDataException("Precision of 8 bit is not expected.");
}
outputWriter = new JpegBuffer8BitOutputWriter(outputBufferSize.Width, context.SkippedScanlines, context.SkippedScanlines + context.RequestedScanlines, decoder.NumberOfComponents, output);
}
else if (decoder.Precision < 8)
{
if (context.BitsPerSample.GetFirstOrDefault() != 8)
{
throw new InvalidDataException($"Precision of {decoder.Precision} bit is not expected.");
}
outputWriter = new JpegBufferAny8BitOutputWriter(outputBufferSize.Width, context.SkippedScanlines, context.SkippedScanlines + context.RequestedScanlines, decoder.NumberOfComponents, decoder.Precision, output);
}
else if (decoder.Precision <= 16)
{
if (context.BitsPerSample.GetFirstOrDefault() != 16)
{
throw new InvalidDataException($"Precision of {decoder.Precision} bit is not expected.");
}
outputWriter = new JpegBufferAny16BitOutputWriter(outputBufferSize.Width, context.SkippedScanlines, context.SkippedScanlines + context.RequestedScanlines, decoder.NumberOfComponents, decoder.Precision, output);
}
else
{
throw new InvalidDataException($"Precision of {decoder.Precision} bit is not expected.");
}
// Decode
decoder.SetOutputWriter(outputWriter);
decoder.Decode();
// Reset state
decoder.ResetInput();
decoder.ResetHeader();
decoder.ResetOutputWriter();
// Cache the instances
Interlocked.CompareExchange(ref _decoder, decoder, null);
}