public void ParseAtoms(ContainerVisitor visitor, BinaryReader reader, long offset, long stopAt, StructInstance parent)
{
while (offset < stopAt)
{
reader.BaseStream.Seek(offset, SeekOrigin.Begin);
uint atomSize = Util.EndianFlip32(reader.ReadUInt32());
string atomType = Util.ReadFourCC(reader);
if (_atomDefs.ContainsKey(atomType))
{
StructElement atomDef = _atomDefs[atomType];
StructInstance inst = GetAtomInstance(reader, atomDef, atomSize, parent);
string desc = GetAtomDesc(atomDef, atomSize, inst);
visitor.BeginVisitNode(atomType, desc);
// If it is a container atom
if (atomDef != null && atomDef.Elements == null)
{
// parse children atoms recursively
ParseAtoms(visitor, reader, reader.BaseStream.Position, offset + atomSize, inst);
}
if (parent != null)
{
parent[atomType] = inst;
}
visitor.EndVisitNode();
}
// now set offset to next atom (or end-of-file) in special case
// (atomSize = 0 means atom goes to EOF)
if (atomSize == 0)
{
offset = reader.BaseStream.Length;
}
else
{
offset += atomSize;
}
// if a 'udta' container atom, then jump ahead 4 to work around
// Apple's QT 1.0 workaround
// @see http://developer.apple.com/technotes/qt/qt_03.html
if (atomType == "udta")
{
offset += 4;
}
}
}
public void ParseListsChunks(ContainerVisitor visitor, BinaryReader reader, long offset, long stopAt, StructInstance parent)
{
while (offset < stopAt)
{
reader.BaseStream.Seek(offset, SeekOrigin.Begin);
string id = Util.ReadFourCC(reader);
int size = reader.ReadInt32();
if (size % 2 != 0)
{
size++;
}
StructInstance inst = null;
if (id == "LIST") // 'LIST' listSize listType listData
{
string listType = Util.ReadFourCC(reader);
// a LIST instance is needed to maintain a list of sub LISTs and CHUNKs.
StructElement listDef = _chunkDefs["LIST"];
inst = GetChunkInstance(reader, listDef, 0, parent);
if (listType != "movi")
{
visitor.BeginVisitNode(
string.Format("LIST ({0})", listType), string.Empty);
ParseListsChunks(visitor, reader, reader.BaseStream.Position, offset + size + 8, inst);
}
else
{
visitor.BeginVisitNode(
string.Format("LIST ({0})", listType), "Content in this list is skipped.");
}
offset += size + 8;
}
else // ckID ckSize ckData
{
StructElement chunkDef = _chunkDefs[id];
inst = GetChunkInstance(reader, chunkDef, size, parent);
visitor.BeginVisitNode(id, GetChunkDescription(reader, id, size, inst));
offset += size + 8;
}
if (parent != null)
{
// link CHUNK to its parent LIST
parent[id] = inst;
}
visitor.EndVisitNode();
}
}
public void Walk(ContainerVisitor visitor)
{
using (BinaryReader reader = new BinaryReader(File.OpenRead(_fname)))
{
// 'RIFF' fileSize fileType (data)
if (Util.ReadFourCC(reader) == "RIFF")
{
_fileSize = reader.ReadInt32();
_fileType = Util.ReadFourCC(reader);
visitor.BeginVisitNode(string.Format("RIFF ({0})", _fileType), string.Empty);
ParseListsChunks(visitor, reader, reader.BaseStream.Position, _fileSize + 8, null);
visitor.EndVisitNode();
}
}
}
