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);
}
public void ReadSkippingAllRows()
{
if (FirstChunksNotYetRead())
{
ReadFirstChunks();
}
iIdatCstream.DisableCrcCheck();
try
{
int num;
do
{
num = iIdatCstream.Read(rowbfilter, 0, rowbfilter.Length);
}while (num >= 0);
}
catch (IOException cause)
{
throw new PngjInputException("error in raw read of IDAT", cause);
}
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());
}
ReadLastAndClose();
}
public PngChunk ReadChunk(byte[] chunkid, int clen, bool skipforced)
{
if (clen < 0)
{
throw new PngjInputException("invalid chunk lenght: " + clen.ToString());
}
if (skipChunkIdsSet == null && CurrentChunkGroup > 0)
{
skipChunkIdsSet = new Dictionary <string, int>();
if (SkipChunkIds != null)
{
string[] skipChunkIds = SkipChunkIds;
foreach (string key in skipChunkIds)
{
skipChunkIdsSet.Add(key, 1);
}
}
}
string text = ChunkHelper.ToString(chunkid);
PngChunk pngChunk = null;
bool flag = ChunkHelper.IsCritical(text);
bool flag2 = skipforced;
if (MaxTotalBytesRead > 0 && clen + offset > MaxTotalBytesRead)
{
throw new PngjInputException("Maximum total bytes to read exceeeded: " + MaxTotalBytesRead.ToString() + " offset:" + offset.ToString() + " clen=" + clen.ToString());
}
if (CurrentChunkGroup > 0 && !ChunkHelper.IsCritical(text))
{
flag2 = (flag2 || (SkipChunkMaxSize > 0 && clen >= SkipChunkMaxSize) || skipChunkIdsSet.ContainsKey(text) || (MaxBytesMetadata > 0 && clen > MaxBytesMetadata - bytesChunksLoaded) || !ChunkHelper.ShouldLoad(text, ChunkLoadBehaviour));
}
if (flag2)
{
PngHelperInternal.SkipBytes(inputStream, clen);
PngHelperInternal.ReadInt4(inputStream);
pngChunk = new PngChunkSkipped(text, ImgInfo, clen);
}
else
{
ChunkRaw chunkRaw = new ChunkRaw(clen, chunkid, alloc: true);
chunkRaw.ReadChunkData(inputStream, crcEnabled | flag);
pngChunk = PngChunk.Factory(chunkRaw, ImgInfo);
if (!pngChunk.Crit)
{
bytesChunksLoaded += chunkRaw.Length;
}
}
pngChunk.Offset = offset - 8;
chunksList.AppendReadChunk(pngChunk, CurrentChunkGroup);
offset += (long)clen + 4L;
return(pngChunk);
}
