/// <summary>
/// Initializes new PDU reader from buffer
/// </summary>
/// <param name="buffer">Buffer</param>
public RawPDU(byte[] buffer)
{
_is = new MemoryStream(buffer);
BinaryReader br = EndianBinaryReader.Create(_is, _encoding, Endian.Big);
_type = br.ReadByte();
}
/// <summary>
/// Initializes new PDU reader from buffer
/// </summary>
/// <param name="buffer">Buffer</param>
public RawPDU(byte[] buffer)
{
_ms = new MemoryStream(buffer);
_br = EndianBinaryReader.Create(_ms, _encoding, Endian.Big);
_type = _br.ReadByte();
_ms.Seek(6, SeekOrigin.Begin);
}
public RLEDecoder(IList <ByteBuffer> data)
{
uint size = 0;
foreach (ByteBuffer frag in data)
{
size += (uint)frag.Length;
}
MemoryStream stream = new MemoryStream(data[0].ToBytes());
for (int i = 1; i < data.Count; i++)
{
stream.Seek(0, SeekOrigin.End);
byte[] ba = data[i].ToBytes();
stream.Write(ba, 0, ba.Length);
}
BinaryReader reader = EndianBinaryReader.Create(stream, Endian.Little);
_count = (int)reader.ReadUInt32();
_offsets = new int[15];
for (int i = 0; i < 15; i++)
{
_offsets[i] = reader.ReadInt32();
}
_data = new byte[stream.Length - 64]; // take off 64 bytes for the offsets
stream.Read(_data, 0, _data.Length);
}
/// <summary>
/// Initializes new PDU reader from stream
/// </summary>
/// <param name="s">Input stream</param>
public RawPDU(Stream s)
{
_is = s;
BinaryReader br = EndianBinaryReader.Create(_is, _encoding, Endian.Big);
_type = br.ReadByte();
}
/// <summary>
/// Constructor.
/// </summary>
/// <remarks>
/// It is assumed that this constructor must be used when reading a PDU. This constructor
/// will not work when writing a PDU.
/// </remarks>
/// <param name="s">The Stream to read from.</param>
public RawPDU(Stream s)
{
BinaryReader br = EndianBinaryReader.Create(s, Endian.Big);
_type = br.ReadByte(); // PDU-Type
_is = s;
}
/// <summary>
/// Reads PDU into memory
/// </summary>
public void ReadPDU()
{
_ms = new MemoryStream();
BinaryReader br = EndianBinaryReader.Create(_is, _encoding, Endian.Big);
br.ReadByte();
uint len = br.ReadUInt32(); // PDU-Length
byte[] data = br.ReadBytes((int)len);
_ms = new MemoryStream(data, false);
_br = EndianBinaryReader.Create(_ms, _encoding, Endian.Big);
}
public void ReadPDU()
{
BinaryReader br = EndianBinaryReader.Create(_is, Endian.Big);
_type = br.ReadByte();
br.ReadByte();
uint len = br.ReadUInt32(); // PDU-Length
byte[] data = br.ReadBytes((int)len);
_ms = new MemoryStream(data, 0, data.Length, false, true);
_br = EndianBinaryReader.Create(_ms, Endian.Big);
}
public RLEDecoder(IList <DicomFragment> data)
{
uint size = 0;
foreach (DicomFragment frag in data)
{
size += frag.Length;
}
MemoryStream stream = new MemoryStream(data[0].GetByteArray());
for (int i = 1; i < data.Count; i++)
{
stream.Seek(0, SeekOrigin.End);
byte[] ba = data[i].GetByteArray();
stream.Write(ba, 0, ba.Length);
}
BinaryReader reader = EndianBinaryReader.Create(stream, Endian.Little);
_count = (int)reader.ReadUInt32();
_offsets = new int[15];
for (int i = 0; i < 15; i++)
{
_offsets[i] = reader.ReadInt32();
}
_data = new byte[stream.Length - 64]; // take off 64 bytes for the offsets
var tempBuffer = new byte[_data.Length];
using (var ms = new MemoryStream())
{
int read;
while ((read = stream.Read(tempBuffer, 0, tempBuffer.Length)) > 0)
{
ms.Write(tempBuffer, 0, read);
}
_data = ms.ToArray();
}
}
//DCMTK djcodecd.cxx
public static int ScanJpegForBitDepth(DicomPixelData pixelData)
{
DicomItem item = pixelData.Dataset.GetDicomItem <DicomItem>(DicomTag.PixelData);
IByteBuffer buffer = item is DicomFragmentSequence fragmentSequence ? fragmentSequence.Fragments[0] : (item as DicomElement).Buffer;
var ms = new MemoryStream(buffer.Data);
BinaryReader br = EndianBinaryReader.Create(ms, Endian.Big);
long length = ms.Length;
while (ms.Position < length)
{
ushort marker = br.ReadUInt16();
switch (marker)
{
case 0xffc0: // SOF_0: JPEG baseline
case 0xffc1: // SOF_1: JPEG extended sequential DCT
case 0xffc2: // SOF_2: JPEG progressive DCT
case 0xffc3: // SOF_3: JPEG lossless sequential
case 0xffc5: // SOF_5: differential (hierarchical) extended sequential, Huffman
case 0xffc6: // SOF_6: differential (hierarchical) progressive, Huffman
case 0xffc7: // SOF_7: differential (hierarchical) lossless, Huffman
ms.Seek(2, SeekOrigin.Current);
return((int)br.ReadByte());
case 0xffc8: // Reserved for JPEG extentions
ms.Seek(br.ReadUInt16() - 2, SeekOrigin.Current);
break;
case 0xffc9: // SOF_9: extended sequential, arithmetic
case 0xffca: // SOF_10: progressive, arithmetic
case 0xffcb: // SOF_11: lossless, arithmetic
case 0xffcd: // SOF_13: differential (hierarchical) extended sequential, arithmetic
case 0xffce: // SOF_14: differential (hierarchical) progressive, arithmetic
case 0xffcf: // SOF_15: differential (hierarchical) lossless, arithmetic
ms.Seek(2, SeekOrigin.Current);
return((int)br.ReadByte());
case 0xffc4: // DHT
case 0xffcc: // DAC
ms.Seek(br.ReadUInt16() - 2, SeekOrigin.Current);
break;
case 0xffd0: // RST m
case 0xffd1:
case 0xffd2:
case 0xffd3:
case 0xffd4:
case 0xffd5:
case 0xffd6:
case 0xffd7:
case 0xffd8: // SOI
case 0xffd9: // EOI
break;
case 0xffda: // SOS
case 0xffdb: // DQT
case 0xffdc: // DNL
case 0xffdd: // DRI
case 0xffde: // DHP
case 0xffdf: // EXP
case 0xffe0: // APPn
case 0xffe1:
case 0xffe2:
case 0xffe3:
case 0xffe4:
case 0xffe5:
case 0xffe6:
case 0xffe7:
case 0xffe8:
case 0xffe9:
case 0xffea:
case 0xffeb:
case 0xffec:
case 0xffed:
case 0xffee:
case 0xffef:
case 0xfff0: // JPGn
case 0xfff1:
case 0xfff2:
case 0xfff3:
case 0xfff4:
case 0xfff5:
case 0xfff6:
case 0xfff7:
case 0xfff8:
case 0xfff9:
case 0xfffa:
case 0xfffb:
case 0xfffc:
case 0xfffd:
case 0xfffe: // COM
ms.Seek(br.ReadUInt16() - 2, SeekOrigin.Current);
break;
case 0xff01: // TEM
break;
default:
int b1 = br.ReadByte();
int b2 = br.ReadByte();
if (b1 == 0xff && b2 > 2 && b2 <= 0xbf) // RES reserved markers
{
break;
}
else
{
throw new DicomCodecException("Unable to determine bit depth: JPEG syntax error!");
}
}
}
throw new DicomCodecException("Unable to determine bit depth: no JPEG SOF marker found!");
}
