/// <summary>
/// Writes a color image into a DjVu IW44 file. This function creates a
/// composite Form element containing one or more IW44 encoded chunks.
/// Data for each chunk is generated with a call to EncodeChunk method
/// while encoding is controlled by the corresponding parameters in an array
/// parameter settings.
/// </summary>
/// <param name="writer"></param>
/// <param name="settings"></param>
/// <returns></returns>
public DjvuFormElement EncodeImage(IDjvuWriter writer, int nchunks, InterWaveEncoderSettings[] settings,
ChunkType formType = ChunkType.PM44Form, ChunkType nodeType = ChunkType.PM44)
{
if (_YEncoder != null)
{
throw new DjvuInvalidOperationException($"Encoder already exists or left open from previous operation.");
}
int flag = 1;
PM44Form form = (PM44Form)DjvuParser.CreateEncodedDjvuNode(writer, null, formType, 0);
for (int i = 0; flag != 0 && i < nchunks; i++)
{
byte[] data = null;
using (MemoryStream stream = new MemoryStream())
{
flag = EncodeChunk(stream, settings[i]);
data = new byte[stream.Position];
Buffer.BlockCopy(stream.GetBuffer(), 0, data, 0, data.Length);
}
PM44Chunk chunk = (PM44Chunk)DjvuParser.CreateEncodedDjvuNode(writer, form, nodeType, data.Length);
chunk.ChunkData = data;
form.AddChild(chunk);
}
CloseEncoder();
return(form);
}
public void WriteDataTest()
{
byte[] buffer = new byte[2048];
Mock <IDjvuReader> readerMock = new Mock <IDjvuReader>();
readerMock.Setup(x => x.Position).Returns(1024);
Mock <DjvuNode> nodeMock1 = new Mock <DjvuNode> {
CallBase = true
};
nodeMock1.Object.ChunkData = buffer;
nodeMock1.Setup(x => x.Name).Returns("PM44");
nodeMock1.Object.Length = buffer.Length;
Mock <DjvuNode> nodeMock2 = new Mock <DjvuNode> {
CallBase = true
};
nodeMock2.Object.ChunkData = buffer;
nodeMock2.Setup(x => x.Name).Returns("PM44");
nodeMock2.Object.Length = buffer.Length;
Mock <IDjvuWriter> writerMock = new Mock <IDjvuWriter>();
writerMock.Setup <long>(x => x.WriteUTF8String(It.IsAny <string>())).Returns(4);
writerMock.Setup(x => x.WriteUInt32BigEndian(It.IsAny <uint>()));
writerMock.Setup(x => x.Write(buffer, 0, buffer.Length));
PM44Form form = new PM44Form(readerMock.Object, null, null, "PM44Form", 2048);
form.ChunkData = buffer;
int result = form.AddChild(nodeMock1.Object);
Assert.Equal <int>(1, result);
Assert.Equal <int>(1, form.Children.Count);
result = form.InsertChild(0, nodeMock2.Object);
Assert.Equal <int>(2, result);
Assert.Equal <int>(2, form.Children.Count);
form.WriteData(writerMock.Object);
writerMock.Verify(x => x.WriteUTF8String("FORM"), Times.Once());
writerMock.Verify(x => x.WriteUTF8String("PM44"), Times.Exactly(3));
writerMock.Verify(x => x.WriteUInt32BigEndian((uint)buffer.Length), Times.Exactly(2));
writerMock.Verify(x => x.WriteUInt32BigEndian(((uint)buffer.Length + 8) * 2 + 4), Times.Exactly(1));
writerMock.Verify(x => x.Write(buffer, 0, buffer.Length), Times.Exactly(2));
}
