/
QuickTimeFile.cs
executable file
·138 lines (116 loc) · 3.79 KB
/
QuickTimeFile.cs
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using System;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
using System.Collections.Generic;
using FileWalk.Schema;
namespace FileWalk
{
/// <summary>
/// Summary description for QuickTimeFile.
/// </summary>
public class QuickTimeFile : ContainerFile
{
private string _fname;
private static Dictionary<string,StructElement> _atomDefs;
public QuickTimeFile(string fname)
{
_fname = fname;
if (_atomDefs == null)
{
_atomDefs = new Dictionary<string, StructElement>();
FileSchema schema = FileSchema.Load("FileWalk.Schema.QuickTime.xml");
foreach (StructElement atomDef in schema.Structs)
{
_atomDefs[atomDef.Name] = atomDef;
}
}
}
#region ContainerFile Members
public void Walk(ContainerVisitor visitor)
{
using (BinaryReader reader = new BinaryReader(File.OpenRead(_fname)))
{
ParseAtoms(visitor, reader, 0, reader.BaseStream.Length, null);
}
}
#endregion
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;
}
}
}
private StructInstance GetAtomInstance(BinaryReader reader, StructElement atomDef, uint atomSize, StructInstance parent)
{
StructInstance inst = null;
if (atomDef != null)
{
int size = atomDef.Size;
if (size != 0)
{
inst = atomDef.Parse(parent, reader.BaseStream, reader.BaseStream.Position + atomSize - 8) as StructInstance;
}
else
{
inst = atomDef.Parse(parent, null, 0) as StructInstance;
}
}
return inst;
}
private string GetAtomDesc(StructElement atomDef, uint atomSize, StructInstance inst)
{
StringBuilder sb = new StringBuilder();
if (atomDef != null && atomDef.Description != string.Empty)
{
sb.Append(atomDef.Description);
sb.Append("\r\n\r\n");
}
sb.AppendFormat("Atom size = {0}\r\n\r\n", atomSize);
if (inst != null)
{
sb.Append(FileSchema.DumpInstance(inst, string.Empty));
}
return sb.ToString();
}
}
}