/// <exception cref="System.IO.IOException"/>
private static Jpeg2000ImageData.ColorSpecBox Jp2_read_colr(Jpeg2000ImageHelper.Jpeg2000Box box, Stream jpeg2000Stream
)
{
int readBytes = 8;
Jpeg2000ImageData.ColorSpecBox colorSpecBox = new Jpeg2000ImageData.ColorSpecBox();
for (int i = 0; i < 3; i++)
{
colorSpecBox.Add(Cio_read(1, jpeg2000Stream));
readBytes++;
}
if (colorSpecBox.GetMeth() == 1)
{
colorSpecBox.Add(Cio_read(4, jpeg2000Stream));
readBytes += 4;
}
else
{
colorSpecBox.Add(0);
}
if (box.length - readBytes > 0)
{
byte[] colorProfile = new byte[box.length - readBytes];
jpeg2000Stream.JRead(colorProfile, 0, box.length - readBytes);
colorSpecBox.SetColorProfile(colorProfile);
}
return(colorSpecBox);
}
/// <exception cref="System.IO.IOException"/>
private static void Jp2_read_boxhdr(Jpeg2000ImageHelper.Jpeg2000Box box, Stream jpeg2000Stream)
{
box.length = Cio_read(4, jpeg2000Stream);
box.type = Cio_read(4, jpeg2000Stream);
if (box.length == 1)
{
if (Cio_read(4, jpeg2000Stream) != 0)
{
throw new iText.IO.IOException(iText.IO.IOException.CannotHandleBoxSizesHigherThan2_32);
}
box.length = Cio_read(4, jpeg2000Stream);
if (box.length == 0)
{
throw new iText.IO.IOException(iText.IO.IOException.UnsupportedBoxSizeEqEq0);
}
}
else
{
if (box.length == 0)
{
throw new Jpeg2000ImageHelper.ZeroBoxSizeException("Unsupported box size == 0");
}
}
}
/// <summary>This method checks if the image is a valid JPEG and processes some parameters.</summary>
private static void ProcessParameters(Jpeg2000ImageData jp2)
{
jp2.parameters = new Jpeg2000ImageData.Parameters();
try {
if (jp2.GetData() == null)
{
jp2.LoadData();
}
Stream jpeg2000Stream = new MemoryStream(jp2.GetData());
Jpeg2000ImageHelper.Jpeg2000Box box = new Jpeg2000ImageHelper.Jpeg2000Box();
box.length = Cio_read(4, jpeg2000Stream);
if (box.length == 0x0000000c)
{
jp2.parameters.isJp2 = true;
box.type = Cio_read(4, jpeg2000Stream);
if (JP2_JP != box.type)
{
throw new iText.IO.IOException(iText.IO.IOException.ExpectedJpMarker);
}
if (0x0d0a870a != Cio_read(4, jpeg2000Stream))
{
throw new iText.IO.IOException(iText.IO.IOException.ErrorWithJpMarker);
}
Jp2_read_boxhdr(box, jpeg2000Stream);
if (JP2_FTYP != box.type)
{
throw new iText.IO.IOException(iText.IO.IOException.ExpectedFtypMarker);
}
StreamUtil.Skip(jpeg2000Stream, 8);
for (int i = 4; i < box.length / 4; ++i)
{
if (Cio_read(4, jpeg2000Stream) == JPX_JPXB)
{
jp2.parameters.isJpxBaseline = true;
}
}
Jp2_read_boxhdr(box, jpeg2000Stream);
do
{
if (JP2_JP2H != box.type)
{
if (box.type == JP2_JP2C)
{
throw new iText.IO.IOException(iText.IO.IOException.ExpectedJp2hMarker);
}
StreamUtil.Skip(jpeg2000Stream, box.length - 8);
Jp2_read_boxhdr(box, jpeg2000Stream);
}
}while (JP2_JP2H != box.type);
Jp2_read_boxhdr(box, jpeg2000Stream);
if (JP2_IHDR != box.type)
{
throw new iText.IO.IOException(iText.IO.IOException.ExpectedIhdrMarker);
}
jp2.SetHeight(Cio_read(4, jpeg2000Stream));
jp2.SetWidth(Cio_read(4, jpeg2000Stream));
jp2.parameters.numOfComps = Cio_read(2, jpeg2000Stream);
jp2.SetBpc(Cio_read(1, jpeg2000Stream));
StreamUtil.Skip(jpeg2000Stream, 3);
Jp2_read_boxhdr(box, jpeg2000Stream);
if (box.type == JP2_BPCC)
{
jp2.parameters.bpcBoxData = new byte[box.length - 8];
jpeg2000Stream.JRead(jp2.parameters.bpcBoxData, 0, box.length - 8);
}
else
{
if (box.type == JP2_COLR)
{
do
{
if (jp2.parameters.colorSpecBoxes == null)
{
jp2.parameters.colorSpecBoxes = new List <Jpeg2000ImageData.ColorSpecBox>();
}
jp2.parameters.colorSpecBoxes.Add(Jp2_read_colr(box, jpeg2000Stream));
try {
Jp2_read_boxhdr(box, jpeg2000Stream);
}
catch (Jpeg2000ImageHelper.ZeroBoxSizeException) {
}
}while (JP2_COLR == box.type);
}
}
}
else
{
//Probably we have reached the contiguous codestream box which is the last in jpeg2000 and has no length.
if (box.length == unchecked ((int)(0xff4fff51)))
{
StreamUtil.Skip(jpeg2000Stream, 4);
int x1 = Cio_read(4, jpeg2000Stream);
int y1 = Cio_read(4, jpeg2000Stream);
int x0 = Cio_read(4, jpeg2000Stream);
int y0 = Cio_read(4, jpeg2000Stream);
StreamUtil.Skip(jpeg2000Stream, 16);
jp2.SetColorSpace(Cio_read(2, jpeg2000Stream));
jp2.SetBpc(8);
jp2.SetHeight(y1 - y0);
jp2.SetWidth(x1 - x0);
}
else
{
throw new iText.IO.IOException(iText.IO.IOException.InvalidJpeg2000File);
}
}
}
catch (System.IO.IOException e) {
throw new iText.IO.IOException(iText.IO.IOException.Jpeg2000ImageException, e);
}
}
