public IEnumerable <string> GetAsciis(string elementName)
{
var sig32 = MkvFormat.GetLeafSigVal(elementName);
foreach (var node in GetNodes(elementName))
{
if (node is EbmlNodeLeaf leaf)
{
yield return(Encoding.ASCII.GetString(leaf.payload, 0, leaf.payload.Length));
}
}
}
public Model(Stream stream, string path)
{
base._data = Data = new MkvFormat(this, stream, path);
var bb = new byte[5];
Data.fbs.Position = Data.ValidSize = 4;
Data.root = ParseTree(rootSig);
Data.layout.Add(Data.root);
if (Data.Issues.HasError)
{
return;
}
System.Diagnostics.Debug.Assert(Data.ValidSize == Data.fbs.Position);
Data.fbs.Position = Data.ValidSize;
long SegmentLength = ReadMTF(0x18, 0x53, 0x80, 0x67);
if (SegmentLength < 0)
{
IssueModel.Add("Missing root element.", Severity.Fatal); return;
}
System.Diagnostics.Debug.Assert(Data.ValidSize == Data.fbs.Position);
long segmentStart = Data.ValidSize;
var diff = Data.ValidSize + SegmentLength - Data.FileSize;
if (diff > 0)
{
IssueModel.Add($"File appears truncated by {diff} bytes.", Severity.Error);
}
Data.segment = new EbmlNodeMaster(segmentSig, SegmentLength);
Data.layout.Add(Data.segment);
Data.fbs.Position = Data.ValidSize;
while (Data.ValidSize < segmentStart + SegmentLength)
{
Data.fbs.Position = Data.ValidSize;
int got = Data.fbs.Read(bb, 0, 4);
if (got < 3)
{
break;
}
if (bb[0] == voidSig.Sig32)
{
Data.fbs.Position = Data.ValidSize + 1;
var voidLenBuf = ReadMTF(Data.fbs, out long voidLen);
if (voidLen < 0)
{
IssueModel.Add("File truncated near void.", Severity.Fatal); return;
}
Data.ValidSize += 1 + voidLenBuf.Length + voidLen;
var voidNode = new EbmlNodeLeaf(voidSig, voidLen);
Data.segment.AddNode(voidNode);
continue;
}
if (got < 4)
{
break;
}
foreach (var mstr in topSigs)
{
if (mstr.SigIsStartOf(bb))
{
Data.fbs.Position = Data.ValidSize = Data.ValidSize + 4;
if ((mstr.Flag & ParseFlag.PrunePayload) != 0)
{
var payloadLenBuf = ReadMTF(Data.fbs, out long payloadLen);
if (payloadLen < 0)
{
IssueModel.Add("File corrupt or truncated.", Severity.Fatal); return;
}
Data.ValidSize += payloadLenBuf.Length + payloadLen;
Data.segment.AddMaster(mstr, payloadLenBuf.Length + payloadLen);
}
else
{
var newNode = ParseTree(mstr);
if (IssueModel.Data.HasFatal)
{
if (newNode != null)
{
Data.segment.AddNode(newNode);
}
return;
}
Data.segment.AddNode(newNode);
}
goto NEXT_SEG;
}
}
string msg = $"Parse fail at 0x{Data.ValidSize:X} on [{bb[0]:X2}][{bb[1]:X2}][{bb[2]:X2}][{bb[3]:X2}].";
IssueModel.Add(msg, Severity.Fatal);
return;
NEXT_SEG :;
}
Data.fbs.Position = Data.ValidSize;
var got2 = Data.fbs.Read(bb, 0, 4);
if (got2 == 4 && attachSig.SigIsStartOf(bb))
{
// By spec, everything should be within a single Segment.
Data.HasMisplacedAttachment = true;
IssueModel.Add($"Misplaced attachment at {Data.ValidSize:X}", Severity.Warning);
}
Data.fbs.Position = Data.ValidSize;
CalcMark(true);
return;
}