/// <summary>
/// Reads a single node.
/// </summary>
/// <remarks>
/// This won't read the file header or footer, and as such will fail if the stream is a full FBX file
/// </remarks>
/// <returns>The node</returns>
/// <exception cref="FbxException">The FBX data was malformed
/// for the reader's error level</exception>
public FbxNode ReadNode(FbxDocument document)
{
var endOffset = document.Version >= FbxVersion.v7_5 ? stream.ReadInt64() : stream.ReadInt32();
var numProperties = document.Version >= FbxVersion.v7_5 ? stream.ReadInt64() : stream.ReadInt32();
var propertyListLen = document.Version >= FbxVersion.v7_5 ? stream.ReadInt64() : stream.ReadInt32();
var nameLen = stream.ReadByte();
var name = nameLen == 0 ? "" : Encoding.ASCII.GetString(stream.ReadBytes(nameLen));
if (endOffset == 0)
{
// The end offset should only be 0 in a null node
if (errorLevel >= ErrorLevel.Checked && (numProperties != 0 || propertyListLen != 0 || !string.IsNullOrEmpty(name)))
{
throw new FbxException(stream.BaseStream.Position,
"Invalid node; expected NULL record");
}
return(null);
}
var node = new FbxNode {
Name = name
};
var propertyEnd = stream.BaseStream.Position + propertyListLen;
// Read properties
for (int i = 0; i < numProperties; i++)
{
node.AddProperty(ReadProperty());
}
if (errorLevel >= ErrorLevel.Checked && stream.BaseStream.Position != propertyEnd)
{
throw new FbxException(stream.BaseStream.Position,
"Too many bytes in property list, end point is " + propertyEnd);
}
// Read nested nodes
var listLen = endOffset - stream.BaseStream.Position;
if (errorLevel >= ErrorLevel.Checked && listLen < 0)
{
throw new FbxException(stream.BaseStream.Position,
"Node has invalid end point");
}
if (listLen > 0)
{
FbxNode nested;
do
{
nested = ReadNode(document);
node.AddNode(nested);
} while (nested != null);
if (errorLevel >= ErrorLevel.Checked && stream.BaseStream.Position != endOffset)
{
throw new FbxException(stream.BaseStream.Position,
"Too many bytes in node, end point is " + endOffset);
}
}
return(node);
}
/// <summary>
/// Reads the next node from the stream
/// </summary>
/// <returns>The read node, or <c>null</c></returns>
public FbxNode ReadNode()
{
var first = ReadToken();
if (!(first is Identifier id))
{
if (first is EndOfStream)
{
return(null);
}
throw new FbxException(_fbxAsciiFileInfo,
"Unexpected '" + first + "', expected an identifier");
}
var node = new FbxNode {
Name = id.Value
};
// Read properties
object token = ReadToken();
bool expectComma = false;
while (!'{'.Equals(token) && !(token is Identifier) && !'}'.Equals(token))
{
if (expectComma)
{
if (!','.Equals(token))
{
throw new FbxException(_fbxAsciiFileInfo, "Unexpected '" + token + "', expected a ','");
}
expectComma = false;
token = ReadToken();
continue;
}
if (token is char c)
{
switch (c)
{
case '*':
token = ReadArray();
break;
case '}':
case ':':
case ',':
throw new FbxException(_fbxAsciiFileInfo, "Unexpected '" + c + "' in property list");
}
}
node.AddProperty(new FbxValue(token));
expectComma = true; // The final comma before the open brace isn't required
token = ReadToken();
}
// TODO: Merge property list into an array as necessary
// Now we're either at an open brace, close brace or a new node
if (token is Identifier || '}'.Equals(token))
{
prevToken = token;
return(node);
}
// The while loop can't end unless we're at an open brace, so we can continue right on
object endBrace = ReadToken();
while (!'}'.Equals(endBrace))
{
prevToken = endBrace; // If it's not an end brace, the next node will need it
node.AddNode(ReadNode());
endBrace = ReadToken();
}
if (node.Nodes.Length < 1) // If there's an open brace, we want that to be preserved
{
node.AddNode(null);
}
return(node);
}
/// <summary>
/// Reads the next node from the stream
/// </summary>
/// <returns>The read node, or <c>null</c></returns>
public FbxNode ReadNode()
{
var first = ReadToken();
if (!(first is IdentifierToken id))
{
if (first is Token tok && tok.TokenType == TokenType.EndOfStream)
{
return(null);
}
throw new FbxException(_fbxAsciiFileInfo, "Unexpected '" + first + "', expected an identifier");
}
var node = new FbxNode(id);
// Read properties
Token token = ReadToken();
bool expectComma = false;
while (token.TokenType != TokenType.OpenBrace && token.TokenType != TokenType.Identifier && token.TokenType != TokenType.CloseBrace)
{
if (expectComma)
{
if (token.TokenType != TokenType.Comma)
{
throw new FbxException(_fbxAsciiFileInfo, "Unexpected '" + token + "', expected a ','");
}
expectComma = false;
token = ReadToken();
continue;
}
if (token.TokenType == TokenType.Asterix)
{
token = ReadArray();
}
else if (token.TokenType == TokenType.CloseBrace || token.TokenType == TokenType.Comma)
{
throw new FbxException(_fbxAsciiFileInfo, "Unexpected '" + token.TokenType + "' in property list");
}
node.AddProperty(token);
expectComma = true; // The final comma before the open brace isn't required
token = ReadToken();
}
// TODO: Merge property list into an array as necessary
// Now we're either at an open brace, close brace or a new node
if (token.TokenType == TokenType.Identifier || token.TokenType == TokenType.CloseBrace)
{
_tokenStack.Push(token);
return(node);
}
// The while loop can't end unless we're at an open brace, so we can continue right on
Token endBrace = ReadToken();
while (endBrace.TokenType != TokenType.CloseBrace)
{
_tokenStack.Push(endBrace);
node.AddNode(ReadNode());
endBrace = ReadToken();
}
if (node.Nodes.Length < 1) // If there's an open brace, we want that to be preserved
{
node.AddNode(null);
}
return(node);
}