/// <summary>
/// Method to read data
/// </summary>
/// <param name="i"></param>
public override void Read(ArrayDataIO i)
{
// Don't need to read null data (noted by Jens Knudstrup)
if (byteSize == 0)
{
return;
}
SetFileOffset(i);
//if(i is RandomAccess)
if (i.CanSeek)
{
//tiler = new ImageDataTiler(this, (RandomAccess) i, ((RandomAccess) i).FilePointer, dataDescription);
tiler = new ImageDataTiler(this, (RandomAccess)i, ((Stream)i).Position, dataDescription);
try
{
double pos = i.Position;
//pos = i.Seek((int)byteSize) - pos;
i.Seek(byteSize);
}
catch (IOException e)
{
throw new FitsException("Unable to skip over data:" + e);
}
}
else
{
dataArray = ArrayFuncs.NewInstance(dataDescription.type, dataDescription.dims);
try
{
i.ReadArray(dataArray);
}
catch (IOException e)
{
throw new FitsException("Unable to read image data:" + e);
}
tiler = new ImageDataTiler(this, null, 0, dataDescription);
}
int pad = FitsUtil.Padding(TrueSize);
try
{
long pos = i.Seek(pad);
if (pos != pad)
{
throw new FitsException("Error skipping padding");
}
}
catch (IOException e)
{
throw new FitsException("Error reading image padding:" + e);
}
}
/// <summary>
/// Method to read the ArrayDataIO
/// </summary>
/// <param name="i"></param>
public override void Read(ArrayDataIO i)
{
SetFileOffset(i);
if (i is RandomAccess)
{
try
{
//BinaryReader temp_BinaryReader;
System.Int64 temp_Int64;
//temp_BinaryReader = i;
temp_Int64 = i.Position; //temp_BinaryReader.BaseStream.Position;
temp_Int64 = i.Seek((int)byteSize) - temp_Int64; //temp_BinaryReader.BaseStream.Seek((int) byteSize, SeekOrigin.Current) - temp_Int64;
int generatedAux = (int)temp_Int64;
}
catch (IOException e)
{
throw new FitsException("Unable to skip over data:" + e);
}
}
else
{
try
{
i.Read(data);
}
catch (IOException e)
{
throw new FitsException("Unable to read unknown data:" + e);
}
}
int pad = FitsUtil.Padding(TrueSize);
try
{
//BinaryReader temp_BinaryReader2;
System.Int64 temp_Int65;
//temp_BinaryReader2 = i;
temp_Int65 = i.Position; //temp_BinaryReader2.BaseStream.Position;
temp_Int65 = i.Seek(pad) - temp_Int65; //temp_BinaryReader2.BaseStream.Seek(pad, SeekOrigin.Current) - temp_Int65;
// if (temp_Int65 != pad)
if (i.Seek(pad) != pad)
{
throw new FitsException("Error skipping padding");
}
}
catch (IOException e)
{
throw new FitsException("Error reading unknown padding:" + e);
}
}
/// <summary>
/// Writes this binary table in one pass,
/// then seeks back to fix NAXIS2. Requires
/// s to be seekable and
/// either no strings or truncated string output.
/// </summary>
/// <param name="s">The destination stream.</param>
protected void WriteThenFix(ArrayDataIO s)
{
long headerMark = s.Position;
int nRows = WriteTable(s);
long endMark = s.Position;
myHeader.RemoveCard("NAXIS2");
myHeader.SetNaxis(2, nRows);
myHeader.InsertComment("No comment.", "THEAP");
myHeader.RemoveCard("THEAP");
s.Seek(headerMark, SeekOrigin.Begin);
myHeader.Write(s);
s.Seek(endMark, SeekOrigin.Begin);
}
/// <summary>Read in an ASCII table. Reading is deferred if
/// we are reading from a random access device</summary>
public override void Read(ArrayDataIO str)
{
SetFileOffset(str);
currInput = str;
//if(str is RandomAccess)
if (str.CanSeek)
{
try
{
//BinaryReader temp_BinaryReader;
Int64 temp_Int64;
//temp_BinaryReader = str;
temp_Int64 = str.Position; //temp_BinaryReader.BaseStream.Position;
temp_Int64 = str.Seek(nRows * rowLen) - temp_Int64;
//temp_BinaryReader.BaseStream.Seek(nRows * rowLen, SeekOrigin.Current) - temp_Int64;
int generatedAux = (int)temp_Int64;
}
catch (IOException e)
{
throw new FitsException("Error skipping data: " + e);
}
}
else
{
try
{
GetBuffer(rowLen * nRows, 0);
}
catch (IOException e)
{
throw new FitsException("Error reading ASCII table:" + e);
}
}
try
{
//BinaryReader temp_BinaryReader2;
Int64 temp_Int65;
//temp_BinaryReader2 = str;
temp_Int65 = str.Position; //temp_BinaryReader2.BaseStream.Position;
temp_Int65 = str.Seek(FitsUtil.Padding(nRows * rowLen)) - temp_Int65;
//temp_BinaryReader2.BaseStream.Seek(FitsUtil.padding(nRows * rowLen), SeekOrigin.Current) - temp_Int65;
int generatedAux2 = (int)temp_Int65;
}
catch (IOException e)
{
throw new FitsException("Error skipping padding:" + e);
}
}
/// <summary>Read the RandomGroupsData.</summary>
public override void Read(ArrayDataIO str)
{
SetFileOffset(str);
try
{
str.ReadArray(dataArray);
}
catch (IOException e)
{
throw new FitsException("IO error reading Random Groups data " + e);
}
int pad = FitsUtil.Padding(TrueSize);
try
{
//System.IO.BinaryReader temp_BinaryReader;
System.Int64 temp_Int64;
//temp_BinaryReader = str;
temp_Int64 = str.Position; //temp_BinaryReader.BaseStream.Position;
temp_Int64 = str.Seek(pad) - temp_Int64; //temp_BinaryReader.BaseStream.Seek(pad, System.IO.SeekOrigin.Current) - temp_Int64;
int generatedAux = (int)temp_Int64;
}
catch (IOException)
{
throw new FitsException("IO error reading padding.");
}
}
/// <summary>Skip the Data object immediately after the given Header object on
/// the given stream object.</summary>
/// <param name="stream">the stream which contains the data.</param>
/// <param name="hdr">template indicating length of Data section</param>
/// <exception cref="IOException"> IOException if the Data object could not be skipped.</exception>
public static void SkipData(ArrayDataIO stream, Header hdr)
{
//System.IO.BinaryReader temp_BinaryReader;
Int64 temp_Int64;
//temp_BinaryReader = stream;
temp_Int64 = stream.Position; //temp_BinaryReader.BaseStream.Position;
temp_Int64 = stream.Seek((int)hdr.DataSize) - temp_Int64; //temp_BinaryReader.BaseStream.Seek((int) hdr.DataSize, System.IO.SeekOrigin.Current) - temp_Int64;
int generatedAux = (int)temp_Int64;
}
/// <summary>Attempt to rewrite the heap with the current contents.
/// Note that no checking is done to make sure that the
/// heap does not extend past its prior boundaries.</summary>
public virtual void Rewrite()
{
if (this.Rewriteable)
{
//ArrayDataIO str = (ArrayDataIO) input;
//FitsUtil.Reposition(input, fileOffset);
input.Seek(fileOffset, SeekOrigin.Begin);
Write(input);
}
else
{
throw new FitsException("Invalid attempt to rewrite FitsHeap");
}
}
/// <summary>Read some data into the buffer.</summary>
private void GetBuffer(int size, long offset)
{
if (currInput == null)
{
throw new IOException("No stream open to read");
}
buffer = new byte[size];
if (offset != 0)
{
//FitsUtil.Reposition(currInput, offset);
currInput.Seek(offset, SeekOrigin.Begin);
}
currInput.Read(buffer); //SupportClass.ReadInput(currInput.BaseStream, ref buffer, 0, buffer.Length);
bp = new ByteParser(buffer);
}
/// <summary>Skip the next HDU on the default input stream.</summary>
public virtual void SkipHDU()
{
if (atEOF)
{
return;
}
else
{
Header hdr = new Header(dataStr);
if (hdr == null)
{
atEOF = true;
return;
}
int dataSize = (int)hdr.DataSize;
// dataStr.Skip(dataSize);
dataStr.Seek(dataSize);
}
}
/// <summary>
/// Writes this binary table with heap temp file if necessary,
/// then fixing nRows and PCOUNT in header,
/// then if necessary copying heap file to destination stream.
/// </summary>
/// <param name="s">The destination stream.</param>
/// steps:
/// 1) write the header to the main stream
/// write the table to the main stream
/// byterenderers write data to the heap if necessary
/// byterenderers return heap positions and lengths if necessary
/// these are returned as a byte sequence like any other data
/// and are written to the table like any other data
/// 2) fix the header
/// 3) write the heap tempfile to the main stream
/// what a pain
protected void WriteHeapOutputWithTempHeapFile(ArrayDataIO s)
{
String heapFilename = CreateTempFilename() + "heap.tmp";
HeapStream heapS = null;
int[] maxColWidths = null;
if (_hasStrings)
{
maxColWidths = new int[_byteRenderers.Length];
heapS = new HeapStream(new FileStream(heapFilename, FileMode.Create));
for (int col = 0; col < _byteRenderers.Length; ++col)
{
_byteRenderers[col].Heap = heapS;
maxColWidths[col] = -1;
}
}
#region 1) write the header and the table
// prep header to make sure it will line up properly with the table later on.
// since we made the header, we know that anything we add later
// (except THEAP, accounted for here) will already have been there,
// so we're not inflating the header
myHeader.RemoveCard("THEAP");
if (_hasStrings && _writeMode == StringWriteMode.HEAP)
{
myHeader.AddValue("THEAP", 0, null);
}
long headerMark = s.Position;
myHeader.Write(s);
int nRows = 0;
for (Array[] els = _rs.GetNextRow(ref _row); els != null;)
{
++nRows;
for (int col = 0; col < _byteRenderers.Length; ++col)
{
_byteRenderers[col].Write(els[col], s);
if (els[col] is String[])
{
maxColWidths[col] = maxColWidths[col] < ((String[])els[col])[0].Length ?
((String[])els[col])[0].Length : maxColWidths[col];
}
}
els = _rs.GetNextRow(ref _row);
}
// pad the table. if there's a heap, pad the heap instead
if (!_hasStrings)
{
int pad = FitsUtil.Padding((long)nRows * (long)_rowSizeInBytes);
s.Write(new byte[pad], 0, pad);
}
s.Flush();
#endregion
#region 2) fix the header and write it to the main stream
myHeader.RemoveCard("NAXIS2");
myHeader.SetNaxis(2, nRows);
// shoehorn correct heap information into header
// PCOUNT, THEAP, and TFORMn
// fix NAXIS1
if (_hasStrings)
{
long theap = (long)nRows * (long)_rowSizeInBytes;
int pad = FitsUtil.Padding(theap + heapS.Position);
int pcount = (int)heapS.Position + pad;
// here we correct for swapping out actual strings with heap indices/lengths
myHeader.RemoveCard("NAXIS1");
myHeader.InsertCard(new HeaderCard("NAXIS1", _rowSizeInBytes, null), "NAXIS2");
myHeader.RemoveCard("PCOUNT");
myHeader.InsertCard(new HeaderCard("PCOUNT", pcount, "Length of heap area in bytes"),
"GCOUNT");
myHeader.RemoveCard("THEAP");
// can't fit a long in here!
if (pcount > 0 && _writeMode == StringWriteMode.HEAP)
{
myHeader.AddValue("THEAP", (int)theap, "Position of heap wrt start of binary table");
}
// fix the TFORMn entries for string columns
IEnumerator ie = null;
bool found = false;
for (int i = 0; i < maxColWidths.Length; ++i, found = false)
{
if (maxColWidths[i] > -1)
{
ie = myHeader.GetEnumerator();
ie.MoveNext();
for (int j = 0; !found && ie.Current != null; ++j, ie.MoveNext())
{
if (("TFORM" + (i + 1)).Equals(((DictionaryEntry)ie.Current).Key))
{
myHeader.RemoveCard(j);
myHeader.
InsertCard(new HeaderCard("TFORM" + (i + 1),
"1PA(" + maxColWidths[i] + ")",
null), j);
found = true;
}
}
}
}
}
// rewrite the header
long heapMark = s.Position;
s.Seek(headerMark, SeekOrigin.Begin);
myHeader.Write(s);
#endregion
#region 3) write the heap tempfile to the main stream
if (_hasStrings)
{
// calculate the pad
int pad = FitsUtil.Padding((long)nRows * (long)_rowSizeInBytes + heapS.Position);
s.Seek(heapMark, SeekOrigin.Begin);
// write heap to the main stream
heapS.Seek(0, SeekOrigin.Begin);
for (int nRead = heapS.Read(_buf, 0, _buf.Length); nRead > 0;)
{
s.Write(_buf, 0, nRead);
nRead = heapS.Read(_buf, 0, _buf.Length);
}
heapS.Close();
File.Delete(heapFilename);
// pad the file
s.Write(new byte[pad], 0, pad);
}
#endregion
}
/// <summary>Fill the subset.</summary>
/// <param name="data">The memory-resident data image.
/// This may be null if the image is to be read from a file. This should
/// be a multi-dimensional primitive array.</param>
/// <param name="o">The tile to be filled. This is a simple primitive array.</param>
/// <param name="dims">The dimensions of the full image.</param>
/// <param name="corners">The indices of the corner of the image.</param>
/// <param name="lengths">The dimensions of the subset.</param>
protected internal virtual void FillTile(Array data, Array o, int[] dims, int[] corners, int[] lengths)
{
int n = dims.Length;
int[] posits = new int[n];
int baseLength = ArrayFuncs.GetBaseLength(o);
int segment = lengths[n - 1];
Array.Copy(corners, 0, posits, 0, n);
long currentOffset = 0;
if (data == null)
{
//currentOffset = f.FilePointer;
currentOffset = f.Position;
}
int outputOffset = 0;
if (data != null && data.GetType().Equals(typeof(Array)) && !ArrayFuncs.IsArrayOfArrays(data))
{
int[] index = new int[posits.Length];
Array.Copy(posits, 0, index, 0, n);
index[index.Length - 1] -= 1;
for (int i = outputOffset; ArrayFuncs.NextIndex(index, posits, lengths); ++i)
{
o.SetValue(data.GetValue(index), i);
}
return;
}
do
{
// This implies there is some overlap in the last index
// (in conjunction with other tests)
int mx = dims.Length - 1;
bool validSegment = posits[mx] + lengths[mx] >= 0 && posits[mx] < dims[mx];
// Don't do anything for the current segment if anything but the
// last index is out of range.
if (validSegment)
{
for (int i = 0; i < mx; i += 1)
{
if (posits[i] < 0 || posits[i] >= dims[i])
{
validSegment = false;
break;
}
}
}
if (validSegment)
{
if (data != null)
{
FillMemData(data, posits, segment, o, outputOffset, 0);
}
else
{
int offset = GetOffset(dims, posits) * baseLength;
// Point to offset at real beginning
// of segment
int actualLen = segment;
int actualOffset = offset;
int actualOutput = outputOffset;
if (posits[mx] < 0)
{
actualOffset -= posits[mx] * baseLength;
actualOutput -= posits[mx];
actualLen += posits[mx];
}
if (posits[mx] + segment > dims[mx])
{
actualLen -= posits[mx] + segment - dims[mx];
}
FillFileData(o, actualOffset, actualOutput, actualLen);
}
}
outputOffset += segment;
}while(IncrementPosition(corners, posits, lengths));
if (data == null)
{
f.Seek(currentOffset, SeekOrigin.Begin);
}
}