/// <summary>
/// Reads (and processes ... up to a point) chunks after last IDAT.
/// </summary>
///
private void ReadLastChunks()
{
CurrentChunkGroup = ChunksList.CHUNK_GROUP_5_AFTERIDAT;
// PngHelper.logdebug("idat ended? " + iIdatCstream.isEnded());
if (!iIdatCstream.IsEnded())
{
iIdatCstream.ForceChunkEnd();
}
var clen = iIdatCstream.GetLenLastChunk();
var chunkid = iIdatCstream.GetIdLastChunk();
var endfound = false;
var first = true;
while (!endfound)
{
var skip = false;
if (!first)
{
clen = PngHelperInternal.ReadInt4(inputStream);
offset += 4;
if (clen < 0)
{
throw new PngjInputException("bad len " + clen);
}
PngHelperInternal.ReadBytes(inputStream, chunkid, 0, 4);
offset += 4;
}
first = false;
if (PngCsUtils.arraysEqual4(chunkid, ChunkHelper.b_IDAT))
{
skip = true; // extra dummy (empty?) idat chunk, it can happen, ignore it
}
else if (PngCsUtils.arraysEqual4(chunkid, ChunkHelper.b_IEND))
{
CurrentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
endfound = true;
}
ReadChunk(chunkid, clen, skip);
}
if (!endfound)
{
throw new PngjInputException("end chunk not found - offset=" + offset);
}
// PngHelper.logdebug("end chunk found ok offset=" + offset);
}
public void ReadLastChunks()
{
CurrentChunkGroup = 5;
if (!iIdatCstream.IsEnded())
{
iIdatCstream.ForceChunkEnd();
}
int num = iIdatCstream.GetLenLastChunk();
byte[] idLastChunk = iIdatCstream.GetIdLastChunk();
bool flag = false;
bool flag2 = true;
bool flag3 = false;
while (!flag)
{
flag3 = false;
if (!flag2)
{
num = PngHelperInternal.ReadInt4(inputStream);
offset += 4L;
if (num < 0)
{
throw new PngjInputException("bad len " + num.ToString());
}
PngHelperInternal.ReadBytes(inputStream, idLastChunk, 0, 4);
offset += 4L;
}
flag2 = false;
if (PngCsUtils.arraysEqual4(idLastChunk, ChunkHelper.b_IDAT))
{
flag3 = true;
}
else if (PngCsUtils.arraysEqual4(idLastChunk, ChunkHelper.b_IEND))
{
CurrentChunkGroup = 6;
flag = true;
}
ReadChunk(idLastChunk, num, flag3);
}
if (!flag)
{
throw new PngjInputException("end chunk not found - offset=" + offset.ToString());
}
}
