/// <summary> This method reads and buffers the tile headers, packet headers and
/// packet data.
///
/// </summary>
/// <param name="fi">The file to read the headers and data from
///
/// </param>
/// <exception cref="IOException">If an I/O error ocurred.
///
/// </exception>
private void readAndBuffer(BufferedRandomAccessFile fi)
{
int p, prem, length, t, markIndex;
// Buffer main header
fi.seek(0);
length = ((System.Int32)positions[0]) - 2;
mainHeader = new byte[length];
fi.readFully(mainHeader, 0, length);
markIndex = 0;
for (t = 0; t < nt; t++)
{
prem = ppt[t];
packetHeaders[t] = new byte[prem][];
packetData[t] = new byte[prem][];
sopMarkSeg[t] = new byte[prem][];
// Read tile header
length = positions[markIndex + 1] - positions[markIndex];
tileHeaders[t] = new byte[length];
fi.readFully(tileHeaders[t], 0, length);
markIndex++;
for (p = 0; p < prem; p++)
{
// Read packet header
length = positions[markIndex + 1] - positions[markIndex];
if (tempSop)
{
// SOP marker is skipped
length -= CSJ2K.j2k.codestream.Markers.SOP_LENGTH;
fi.skipBytes(CSJ2K.j2k.codestream.Markers.SOP_LENGTH);
}
else
{
// SOP marker is read and buffered
length -= CSJ2K.j2k.codestream.Markers.SOP_LENGTH;
sopMarkSeg[t][p] = new byte[CSJ2K.j2k.codestream.Markers.SOP_LENGTH];
fi.readFully(sopMarkSeg[t][p], 0, CSJ2K.j2k.codestream.Markers.SOP_LENGTH);
}
if (!tempEph)
{
// EPH marker is kept in header
length += CSJ2K.j2k.codestream.Markers.EPH_LENGTH;
}
packetHeaders[t][p] = new byte[length];
fi.readFully(packetHeaders[t][p], 0, length);
markIndex++;
// Read packet data
length = positions[markIndex + 1] - positions[markIndex];
length -= CSJ2K.j2k.codestream.Markers.EPH_LENGTH;
if (tempEph)
{
// EPH marker is used and is skipped
fi.skipBytes(CSJ2K.j2k.codestream.Markers.EPH_LENGTH);
}
packetData[t][p] = new byte[length];
fi.readFully(packetData[t][p], 0, length);
markIndex++;
}
}
}
/// <summary> This method writes the new codestream to the file.
///
/// </summary>
/// <param name="fi">The file to write the new codestream to
///
/// </param>
/// <exception cref="IOException">If an I/O error ocurred.
///
/// </exception>
private void writeNewCodestream(BufferedRandomAccessFile fi)
{
int t, p, tp; // i removed
int numTiles = tileParts.Length;
int[][] packetHeaderLengths = new int[numTiles][];
for (int i2 = 0; i2 < numTiles; i2++)
{
packetHeaderLengths[i2] = new int[maxtp];
}
byte[] temp;
int length;
// Write main header up to SOT marker
fi.write(mainHeader, 0, mainHeader.Length);
// If PPM used write all packet headers in PPM markers
if (ppmUsed)
{
System.IO.MemoryStream ppmMarkerSegment = new System.IO.MemoryStream();
int numPackets;
int totNumPackets;
int ppmIndex = 0;
int ppmLength;
int pStart, pStop;
int[] prem = new int[numTiles];
// Set number of remaining packets
for (t = 0; t < numTiles; t++)
{
prem[t] = packetHeaders[t].Length;
}
// Calculate Nppm values
for (tp = 0; tp < maxtp; tp++)
{
for (t = 0; t < numTiles; t++)
{
if (tileParts[t].Length > tp)
{
totNumPackets = packetHeaders[t].Length;
// Calculate number of packets in this tilepart
numPackets = (tp == tileParts[t].Length - 1)?prem[t]:pptp;
pStart = totNumPackets - prem[t];
pStop = pStart + numPackets;
// Calculate number of packet header bytes for this
// tile part
for (p = pStart; p < pStop; p++)
{
packetHeaderLengths[t][tp] += packetHeaders[t][p].Length;
}
prem[t] -= numPackets;
}
}
}
// Write first PPM marker
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(CSJ2K.j2k.codestream.Markers.PPM, 8));
ppmMarkerSegment.WriteByte((System.Byte)(CSJ2K.j2k.codestream.Markers.PPM & 0x00FF));
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temporary Lppm value
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temporary Lppm value
ppmMarkerSegment.WriteByte((System.Byte) 0); // zppm
ppmLength = 3;
ppmIndex++;
// Set number of remaining packets
for (t = 0; t < numTiles; t++)
{
prem[t] = packetHeaders[t].Length;
}
// Write all PPM markers and information
for (tp = 0; tp < maxtp; tp++)
{
for (t = 0; t < numTiles; t++)
{
if (tileParts[t].Length > tp)
{
totNumPackets = packetHeaders[t].Length;
// Calculate number of packets in this tilepart
numPackets = (tp == tileParts[t].Length - 1)?prem[t]:pptp;
pStart = totNumPackets - prem[t];
pStop = pStart + numPackets;
// If Nppm value wont fit in current PPM marker segment
// write current PPM marker segment and start new
if (ppmLength + 4 > CSJ2K.j2k.codestream.Markers.MAX_LPPM)
{
// Write current PPM marker
temp = ppmMarkerSegment.ToArray();
length = temp.Length - 2;
temp[2] = (byte)(SupportClass.URShift(length, 8));
temp[3] = (byte)length;
fi.write(temp, 0, length + 2);
// Start new PPM marker segment
//UPGRADE_ISSUE: Method 'java.io.ByteArrayOutputStream.reset' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javaioByteArrayOutputStreamreset'"
//ppmMarkerSegment.reset();
ppmMarkerSegment.SetLength(0);
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(CSJ2K.j2k.codestream.Markers.PPM, 8));
ppmMarkerSegment.WriteByte((System.Byte)(CSJ2K.j2k.codestream.Markers.PPM & 0x00FF));
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temporary Lppm value
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temporary Lppm value
ppmMarkerSegment.WriteByte((System.Byte)ppmIndex++); // zppm
ppmLength = 3;
}
// Write Nppm value
length = packetHeaderLengths[t][tp];
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(length, 24));
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(length, 16));
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(length, 8));
ppmMarkerSegment.WriteByte((System.Byte)length);
ppmLength += 4;
// Write packet headers
for (p = pStart; p < pStop; p++)
{
length = packetHeaders[t][p].Length;
// If next packet header value wont fit in
// current PPM marker segment write current PPM
// marker segment and start new
if (ppmLength + length > CSJ2K.j2k.codestream.Markers.MAX_LPPM)
{
// Write current PPM marker
temp = ppmMarkerSegment.ToArray();
length = temp.Length - 2;
temp[2] = (byte)(SupportClass.URShift(length, 8));
temp[3] = (byte)length;
fi.write(temp, 0, length + 2);
// Start new PPM marker segment
//UPGRADE_ISSUE: Method 'java.io.ByteArrayOutputStream.reset' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javaioByteArrayOutputStreamreset'"
//ppmMarkerSegment.reset();
ppmMarkerSegment.SetLength(0);
ppmMarkerSegment.WriteByte((System.Byte)SupportClass.URShift(CSJ2K.j2k.codestream.Markers.PPM, 8));
ppmMarkerSegment.WriteByte((System.Byte)(CSJ2K.j2k.codestream.Markers.PPM & 0x00FF));
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temp Lppm value
ppmMarkerSegment.WriteByte((System.Byte) 0); // Temp Lppm value
ppmMarkerSegment.WriteByte((System.Byte)ppmIndex++); // zppm
ppmLength = 3;
}
// write packet header
ppmMarkerSegment.Write(packetHeaders[t][p], 0, packetHeaders[t][p].Length);
ppmLength += packetHeaders[t][p].Length;
}
prem[t] -= numPackets;
}
}
}
// Write last PPM marker segment
temp = ppmMarkerSegment.ToArray();
length = temp.Length - 2;
temp[2] = (byte)(SupportClass.URShift(length, 8));
temp[3] = (byte)length;
fi.write(temp, 0, length + 2);
}
// Write tile parts interleaved
for (tp = 0; tp < maxtp; tp++)
{
for (t = 0; t < nt; t++)
{
if (tileParts[t].Length > tp)
{
temp = tileParts[t][tp];
length = temp.Length;
fi.write(temp, 0, length);
}
}
}
fi.writeShort(CSJ2K.j2k.codestream.Markers.EOC);
}
/// <summary> This method parses the codestream for SOT, SOP and EPH markers and
/// removes header header bits signalling SOP and EPH markers if packed
/// packet headers are used
///
/// </summary>
/// <param name="fi">The file to parse the markers from
///
/// </param>
/// <exception cref="IOException">If an I/O error ocurred.
///
/// </exception>
private void parseAndFind(BufferedRandomAccessFile fi)
{
int length, pos, i, t, sop = 0, eph = 0;
short marker;
int halfMarker;
int tileEnd;
System.Collections.Generic.List <System.Int32> markPos = new List <int>(10);
// Find position of first SOT marker
marker = (short)fi.readUnsignedShort(); // read SOC marker
marker = (short)fi.readUnsignedShort();
while (marker != CSJ2K.j2k.codestream.Markers.SOT)
{
pos = fi.Pos;
length = fi.readUnsignedShort();
// If SOP and EPH markers were only used for parsing in this
// class remove SOP and EPH markers from Scod field
if (marker == CSJ2K.j2k.codestream.Markers.COD)
{
int scod = fi.readUnsignedByte();
if (tempSop)
{
scod &= 0xfd; // Remove bits indicating SOP
}
if (tempEph)
{
scod &= 0xfb; // Remove bits indicating SOP
}
fi.seek(pos + 2);
fi.write(scod);
}
fi.seek(pos + length);
marker = (short)fi.readUnsignedShort();
}
pos = fi.Pos;
fi.seek(pos - 2);
// Find all packet headers, packed data and tile headers
for (t = 0; t < nt; t++)
{
// Read SOT marker
fi.readUnsignedShort(); // Skip SOT
pos = fi.Pos;
markPos.Add((System.Int32)fi.Pos);
fi.readInt(); // Skip Lsot and Isot
length = fi.readInt(); // Read Psot
fi.readUnsignedShort(); // Skip TPsot & TNsot
tileEnd = pos + length - 2; // Last byte of tile
// Find position of SOD marker
marker = (short)fi.readUnsignedShort();
while (marker != CSJ2K.j2k.codestream.Markers.SOD)
{
pos = fi.Pos;
length = fi.readUnsignedShort();
// If SOP and EPH markers were only used for parsing in this
// class remove SOP and EPH markers from Scod field
if (marker == CSJ2K.j2k.codestream.Markers.COD)
{
int scod = fi.readUnsignedByte();
if (tempSop)
{
scod &= 0xfd; // Remove bits indicating SOP
}
if (tempEph)
{
scod &= 0xfb; // Remove bits indicating SOP
}
fi.seek(pos + 2);
fi.write(scod);
}
fi.seek(pos + length);
marker = (short)fi.readUnsignedShort();
}
// Find all SOP and EPH markers in tile
sop = 0;
eph = 0;
i = fi.Pos;
while (i < tileEnd)
{
halfMarker = (short)fi.readUnsignedByte();
if (halfMarker == (short)0xff)
{
marker = (short)((halfMarker << 8) + fi.readUnsignedByte());
i++;
if (marker == CSJ2K.j2k.codestream.Markers.SOP)
{
markPos.Add((System.Int32)fi.Pos);
ppt[t]++;
sop++;
fi.skipBytes(4);
i += 4;
}
if (marker == CSJ2K.j2k.codestream.Markers.EPH)
{
markPos.Add((System.Int32)fi.Pos);
eph++;
}
}
i++;
}
}
markPos.Add((System.Int32)(fi.Pos + 2));
positions = new System.Int32[markPos.Count];
markPos.CopyTo(positions);
}
