private int ReadRowRaw(int nrow)
{
//
if (nrow == 0 && FirstChunksNotYetRead())
{
ReadFirstChunks();
}
if (nrow == 0 && interlaced)
{
Array.Clear(rowb, 0, rowb.Length); // new subimage: reset filters: this is enough, see the swap that happens lines
}
// below
int bytesRead = ImgInfo.BytesPerRow; // NOT including the filter byte
if (interlaced)
{
if (nrow < 0 || nrow > deinterlacer.getRows() || (nrow != 0 && nrow != deinterlacer.getCurrRowSubimg() + 1))
{
throw new PngjInputException("invalid row in interlaced mode: " + nrow);
}
deinterlacer.setRow(nrow);
bytesRead = (ImgInfo.BitspPixel * deinterlacer.getPixelsToRead() + 7) / 8;
if (bytesRead < 1)
{
throw new PngjExceptionInternal("wtf??");
}
}
else // check for non interlaced
{
if (nrow < 0 || nrow >= ImgInfo.Rows || nrow != rowNum + 1)
{
throw new PngjInputException("invalid row: " + nrow);
}
}
rowNum = nrow;
// swap buffers
byte[] tmp = rowb;
rowb = rowbprev;
rowbprev = tmp;
// loads in rowbfilter "raw" bytes, with filter
PngHelperInternal.ReadBytes(idatIstream, rowbfilter, 0, bytesRead + 1);
offset = iIdatCstream.GetOffset();
if (offset < 0)
{
throw new PngjExceptionInternal("bad offset ??" + offset);
}
if (MaxTotalBytesRead > 0 && offset >= MaxTotalBytesRead)
{
throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + MaxTotalBytesRead
+ " offset:" + offset);
}
rowb[0] = 0;
UnfilterRow(bytesRead);
rowb[0] = rowbfilter[0];
if ((rowNum == ImgInfo.Rows - 1 && !interlaced) || (interlaced && deinterlacer.isAtLastRow()))
{
ReadLastAndClose();
}
return(bytesRead);
}
public int ReadRowRaw(int nrow)
{
if (nrow == 0 && FirstChunksNotYetRead())
{
ReadFirstChunks();
}
if (nrow == 0 && interlaced)
{
Array.Clear(rowb, 0, rowb.Length);
}
int num = ImgInfo.BytesPerRow;
if (interlaced)
{
if (nrow < 0 || nrow > deinterlacer.getRows() || (nrow != 0 && nrow != deinterlacer.getCurrRowSubimg() + 1))
{
throw new PngjInputException("invalid row in interlaced mode: " + nrow.ToString());
}
deinterlacer.setRow(nrow);
num = (ImgInfo.BitspPixel * deinterlacer.getPixelsToRead() + 7) / 8;
if (num < 1)
{
throw new PngjExceptionInternal("wtf??");
}
}
else if (nrow < 0 || nrow >= ImgInfo.Rows || nrow != rowNum + 1)
{
throw new PngjInputException("invalid row: " + nrow.ToString());
}
rowNum = nrow;
byte[] array = rowb;
rowb = rowbprev;
rowbprev = array;
PngHelperInternal.ReadBytes(idatIstream, rowbfilter, 0, num + 1);
offset = iIdatCstream.GetOffset();
if (offset < 0)
{
throw new PngjExceptionInternal("bad offset ??" + offset.ToString());
}
if (MaxTotalBytesRead > 0 && offset >= MaxTotalBytesRead)
{
throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + MaxTotalBytesRead.ToString() + " offset:" + offset.ToString());
}
rowb[0] = 0;
UnfilterRow(num);
rowb[0] = rowbfilter[0];
if ((rowNum == ImgInfo.Rows - 1 && !interlaced) || (interlaced && deinterlacer.isAtLastRow()))
{
ReadLastAndClose();
}
return(num);
}