/// <summary>
/// Writes an FBX document
/// </summary>
/// <param name="document">The top level document node</param>
/// <param name="stream"></param>
public static void WriteAscii(FbxDocument document, Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var writer = new FbxAsciiWriter(stream);
writer.Write(document);
}
/// <summary>
/// Writes an FBX document
/// </summary>
/// <param name="document">The top level document node</param>
/// <param name="path"></param>
public static void WriteAscii(FbxDocument document, string path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
using (var stream = new FileStream(path, FileMode.Create)) {
WriteAscii(document, stream);
}
}
/// <summary>
/// Reads an FBX document from the stream
/// </summary>
/// <returns>The top-level node</returns>
/// <exception cref="FbxException">The FBX data was malformed
/// for the reader's error level</exception>
public FbxDocument Read()
{
// Read header
bool validHeader = ReadHeader(stream.BaseStream);
if (errorLevel >= ErrorLevel.Strict && !validHeader)
{
throw new FbxException(stream.BaseStream.Position,
"Invalid header string");
}
var document = new FbxDocument {
Version = (FbxVersion)stream.ReadInt32()
};
// Read nodes
FbxNode nested;
do
{
nested = ReadNode(document);
if (nested != null)
{
document.AddNode(nested);
}
} while (nested != null);
// Read footer code
var footerCode = new byte[footerCodeSize];
stream.BaseStream.Read(footerCode, 0, footerCode.Length);
if (errorLevel >= ErrorLevel.Strict)
{
var validCode = GenerateFooterCode(document);
if (!CheckEqual(footerCode, validCode))
{
throw new FbxException(stream.BaseStream.Position - footerCodeSize,
"Incorrect footer code");
}
}
// Read footer extension
var dataPos = stream.BaseStream.Position;
var validFooterExtension = CheckFooter(stream, document.Version);
if (errorLevel >= ErrorLevel.Strict && !validFooterExtension)
{
throw new FbxException(dataPos, "Invalid footer");
}
return(document);
}
/// <summary>
/// Writes an FBX file to the output
/// </summary>
/// <param name="document"></param>
public void Write(FbxDocument document)
{
stream.BaseStream.Position = 0;
WriteHeader(stream.BaseStream);
stream.Write((int)document.Version);
// TODO: Do we write a top level node or not? Maybe check the version?
foreach (var node in document.Nodes)
{
WriteNode(document, node);
}
WriteNode(document, null);
stream.Write(GenerateFooterCode(document));
WriteFooter(stream, (int)document.Version);
output.Write(memory.ToArray(), 0, (int)memory.Position);
}
/// <summary>
/// Reads a full document from the stream
/// </summary>
/// <returns>The complete document object</returns>
public FbxDocument Read()
{
var ret = new FbxDocument();
// Read version string
const string versionString = @"; FBX (\d)\.(\d)\.(\d) project file";
AsciiTokenParser.TryConsumeWhiteSpace(_fbxAsciiFileInfo);
bool hasVersionString = false;
if (AsciiTokenParser.TryParseCommentToken(_fbxAsciiFileInfo, out var commentToken))
{
var match = Regex.Match(commentToken.Value, versionString);
hasVersionString = match.Success;
if (hasVersionString)
{
ret.Version = (FbxVersion)(
int.Parse(match.Groups[1].Value) * 1000 +
int.Parse(match.Groups[2].Value) * 100 +
int.Parse(match.Groups[3].Value) * 10
);
}
}
if (!hasVersionString && _errorLevel >= ErrorLevel.Strict)
{
throw new FbxException(_fbxAsciiFileInfo, "Invalid version string; first line must match \"" + versionString + "\"");
}
FbxNode node;
while ((node = ReadNode()) != null)
{
ret.AddNode(node);
}
return(ret);
}
// Writes a single document to the buffer
void WriteNode(FbxDocument document, FbxNode node)
{
if (node == null)
{
var data = document.Version >= FbxVersion.v7_5 ? nullData7500 : nullData;
stream.BaseStream.Write(data, 0, data.Length);
}
else
{
// Header
var endOffsetPos = stream.BaseStream.Position;
long propertyLengthPos;
if (document.Version >= FbxVersion.v7_5)
{
stream.Write((long)0); // End offset placeholder
stream.Write((long)node.Properties.Count);
propertyLengthPos = stream.BaseStream.Position;
stream.Write((long)0); // Property length placeholder
}
else
{
stream.Write(0); // End offset placeholder
stream.Write(node.Properties.Count);
propertyLengthPos = stream.BaseStream.Position;
stream.Write(0); // Property length placeholder
}
node.Identifier.WriteBinary(document.Version, stream);
// Write properties and length
var propertyBegin = stream.BaseStream.Position;
for (int i = 0; i < node.Properties.Count; i++)
{
WriteProperty(document.Version, node.Properties[i]);
}
var propertyEnd = stream.BaseStream.Position;
stream.BaseStream.Position = propertyLengthPos;
if (document.Version >= FbxVersion.v7_5)
{
stream.Write(propertyEnd - propertyBegin);
}
else
{
stream.Write((int)(propertyEnd - propertyBegin));
}
stream.BaseStream.Position = propertyEnd;
// Write child nodes
if (node.Nodes.Count > 0)
{
foreach (var n in node.Nodes)
{
if (n == null)
{
continue;
}
WriteNode(document, n);
}
WriteNode(document, null);
}
// Write end offset
var dataEnd = stream.BaseStream.Position;
stream.BaseStream.Position = endOffsetPos;
if (document.Version >= FbxVersion.v7_5)
{
stream.Write(dataEnd);
}
else
{
stream.Write((int)dataEnd);
}
stream.BaseStream.Position = dataEnd;
}
}
/// <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(new IdentifierToken(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);
}
