/// <summary>
/// Decodes the children of this chunk
/// </summary>
/// <param name="reader"></param>
private void ReadChildren(DjvuReader reader)
{
List <IFFChunk> children = new List <IFFChunk>();
// Read in all the chunks
while (reader.Position < Offset + Length + 8)
{
if (reader.Position % 2 == 1)
{
reader.Position++;
}
// Read the chunk ID
string id = reader.ReadUTF8String(4);
ChunkTypes type = IFFChunk.GetChunkType(id);
// Reset the stream position
reader.Position -= 4;
var chunk = IFFChunk.BuildIFFChunk(reader, Document, this, type);
if (chunk != null)
{
children.Add(chunk);
}
}
Children = children.ToArray();
}
/// <summary>
/// Initializes the IFFChunk
/// </summary>
/// <param name="reader"></param>
/// <param name="parent"></param>
public IFFChunk(DjvuReader reader, IFFChunk parent, DjvuDocument document)
{
_reader = reader;
_parent = parent;
_document = document;
// Move back 4 to compensate for the chunk type already read
_offset = reader.Position - 4;
ReadChunkHeader(reader);
ReadChunkData(reader);
}
/// <summary>
/// Gets all the children items of the given type
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="page"></param>
/// <returns></returns>
private T[] GetChildrenItems <T>(IFFChunk page) where T : IFFChunk
{
// Check if this is a thumbnail
if (page is T)
{
return(new T[] { (T)page });
}
// No items if not form
if (page is FormChunk == false)
{
return(new T[0]);
}
List <T> results = new List <T>();
FormChunk form = (FormChunk)page;
foreach (IFFChunk chunk in form.Children)
{
results.AddRange(GetChildrenItems <T>(chunk));
}
return(results.ToArray());
}
public SmmrChunk(DjvuReader reader, IFFChunk parent, DjvuDocument document)
: base(reader, parent, document)
{
}
public FormChunk(DjvuReader reader, IFFChunk parent, DjvuDocument document)
: base(reader, parent, document)
{
// Nothing
}
/// <summary>
/// Builds the appropriate chunk for the ID
/// </summary>
/// <returns></returns>
public static IFFChunk BuildIFFChunk(DjvuReader reader, DjvuDocument rootDocument, IFFChunk parent, ChunkTypes chunkType)
{
IFFChunk result = null;
if (chunkType == ChunkTypes.Form)
{
result = new FormChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Form_Djvm)
{
result = new DjvmChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Form_Djvu)
{
result = new DjvuChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Form_Djvi)
{
result = new DjviChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Form_Thum)
{
result = new ThumChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Dirm)
{
result = new DirmChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Navm)
{
result = new NavmChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Anta)
{
result = new AntaChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Antz)
{
result = new AntzChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Txta)
{
result = new TxtaChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Txtz)
{
result = new TxtzChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Djbz)
{
result = new DjbzChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Sjbz)
{
result = new SjbzChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.FG44)
{
result = new FG44Chunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.BG44)
{
result = new BG44Chunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.TH44)
{
result = new TH44Chunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.WMRM)
{
result = new WmrmChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.FGbz)
{
result = new FGbzChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Info)
{
result = new InfoChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Incl)
{
result = new InclChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.BGjp)
{
result = new BGjpChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.FGjp)
{
result = new FGjpChunk(reader, parent, rootDocument);
}
else if (chunkType == ChunkTypes.Smmr)
{
result = new SmmrChunk(reader, parent, rootDocument);
}
else
{
result = new UnknownChunk(reader, parent, rootDocument);
}
//Console.WriteLine(result);
return(result);
}
