async Task <List <CQRiffList> > FindRiffRoot(Stream stream, byte[] find_header, long begin, long end)
{
stream.Position = begin;
List <CQRiffList> riffs = new List <CQRiffList>();
byte[] header = new byte[4];
while (stream.Position <= end)
{
int readlen = await stream.ReadAsync(header, 0, header.Length);
var bb = header.Except(this.m_Riff);
var cc = header.Except(this.m_List);
if (bb.Count() == 0 || cc.Count() == 0)
{
CQRiffList riff = new CQRiffList();
riff.Pos = stream.Position - 4;
riff.Tag = Encoding.UTF8.GetString(header);
readlen = await stream.ReadAsync(header, 0, header.Length);
riff.Size = BitConverter.ToInt32(header, 0);
readlen = await stream.ReadAsync(header, 0, header.Length);
riff.Name = Encoding.UTF8.GetString(header);
riff.Datas = new ObservableCollection <CQRiffList>();
riffs.Add(riff);
stream.Position = stream.Position + riff.Size - 4;
}
else
{
CQRiffList riff = new CQRiffList();
riff.Tag = Encoding.UTF8.GetString(header);
readlen = await stream.ReadAsync(header, 0, header.Length);
riff.Size = BitConverter.ToInt32(header, 0);
if (riff.Size < 0)
{
break;
}
stream.Position = stream.Position + riff.Size;
if (stream.Position < stream.Length)
{
riffs.Add(riff);
}
}
}
return(riffs);
}
public bool Open(Stream stream)
{
List <CQRiffList> riffs_tree = new List <CQRiffList>();
List <CQRiffList> riffs = new List <CQRiffList>();
while (true)
{
byte[] header = new byte[4];
int readlen = this.m_File.Read(header, 0, header.Length);
var bb = header.Except(this.m_Riff);
var cc = header.Except(this.m_List);
if (cc.Count() == 0 || bb.Count() == 0)
{
CQRiffList riff = new CQRiffList();
riff.Pos = this.m_File.Position - 4;
riff.Tag = Encoding.UTF8.GetString(header);
readlen = this.m_File.Read(header, 0, header.Length);
riff.Size = BitConverter.ToInt32(header, 0);
readlen = this.m_File.Read(header, 0, header.Length);
riff.Name = Encoding.UTF8.GetString(header);
riff.Datas = new ObservableCollection <CQRiffList>();
if (riff.Tag == "RIFF")
{
riffs_tree.Add(riff);
//this.Riffs.Add(riff);
}
else
{
riffs.Last().Datas.Add(riff);
}
riffs.Add(riff);
}
else
{
CQRiffList riff = new CQRiffList();
riff.Pos = this.m_File.Position - 4;
riff.Tag = Encoding.UTF8.GetString(header);
readlen = this.m_File.Read(header, 0, header.Length);
riff.Size = BitConverter.ToInt32(header, 0);
int ss = riff.Size % 2;
long pos = this.m_File.Position + riff.Size + ss;
if (riffs.Count > 0)
{
riffs.Last().Datas.Add(riff);
}
if (riff.Size < 0)
{
break;
}
else if (riffs.Count > 0)
{
while (riffs.Count > 0)
{
if (pos >= riffs.Last().Pos + 8 + riffs.Last().Size)
{
if (riffs.Count > 0)
{
riffs.Remove(riffs.Last());
}
}
else
{
break;
}
}
}
this.m_File.Position = pos;
}
if ((this.m_File.Length - this.m_File.Position) <= 4)
{
break;
}
}
return(true);
}
