public ByamlWriter(Stream stream, bool supportPaths, ByteOrder byteOrder, ushort version)
{
_version = version;
_supportPaths = supportPaths;
_byteOrder = byteOrder;
_writer = new BinaryDataWriter(stream, ByamlFile.GetEncoding(byteOrder), true)
{
ByteOrder = _byteOrder
};
}
protected Dictionary <uint, dynamic> _alreadyReadNodes = null; //Offset in the file, reference to node
// ---- CONSTRUCTORS & DESTRUCTOR ------------------------------------------------------------------------------
public ByamlReader(Stream stream, bool supportPaths, ByteOrder byteOrder, ushort version, bool fastLoad = false)
{
_version = version;
_supportPaths = supportPaths;
_byteOrder = byteOrder;
_fastLoad = fastLoad;
if (fastLoad)
{
_alreadyReadNodes = new Dictionary <uint, dynamic>();
}
_reader = new BinaryDataReader(stream, ByamlFile.GetEncoding(byteOrder), true)
{
ByteOrder = byteOrder
};
}
protected bool TryStartLoading()
{
// Load the header, specifying magic bytes ("BY"), version and main node offsets.
if (_reader.ReadUInt16() != BYAML_MAGIC)
{
//switch endian and try again
_byteOrder = _byteOrder == ByteOrder.LittleEndian ? ByteOrder.BigEndian : ByteOrder.LittleEndian;
_reader = new BinaryDataReader(_reader.BaseStream, ByamlFile.GetEncoding(_byteOrder), true)
{
ByteOrder = _byteOrder
};
_reader.Position = 0;
if (_reader.ReadUInt16() != BYAML_MAGIC)
{
throw new Exception("Header mismatch");
}
}
_version = _reader.ReadUInt16();
uint nameArrayOffset = _reader.ReadUInt32();
uint stringArrayOffset = _reader.ReadUInt32();
if (_reader.Length == 16)
{
_supportPaths = false;
}
else
{
using (_reader.TemporarySeek())
{
// Paths are supported if the third offset is a path array (or unknown) and the fourth a root.
ByamlNodeType thirdNodeType = PeekNodeType(_reader);
_reader.Seek(sizeof(uint));
ByamlNodeType fourthNodeType = PeekNodeType(_reader);
_supportPaths = (thirdNodeType == ByamlNodeType.Unknown || thirdNodeType == ByamlNodeType.PathArray) &&
(fourthNodeType == ByamlNodeType.Array || fourthNodeType == ByamlNodeType.Dictionary);
}
}
uint pathArrayOffset = 0;
if (_supportPaths)
{
pathArrayOffset = _reader.ReadUInt32();
}
uint rootNodeOffset = _reader.ReadUInt32();
if (rootNodeOffset == 0) //empty byml
{
return(false);
}
// Read the name array, holding strings referenced by index for the names of other nodes.
if (nameArrayOffset != 0)
{
_reader.Seek(nameArrayOffset, SeekOrigin.Begin);
_nameArray = ReadCollectionNode(_reader.ReadUInt32());
}
// Read the optional string array, holding strings referenced by index in string nodes.
if (stringArrayOffset != 0)
{
_reader.Seek(stringArrayOffset, SeekOrigin.Begin);
_stringArray = ReadCollectionNode(_reader.ReadUInt32());
}
// Read the optional path array, holding paths referenced by index in path nodes.
if (_supportPaths && pathArrayOffset != 0)
{
// The third offset is the root node, so just read that and we're done.
_reader.Seek(pathArrayOffset, SeekOrigin.Begin);
_pathArray = ReadCollectionNode(_reader.ReadUInt32());
}
// Read the root node.
_reader.Seek(rootNodeOffset, SeekOrigin.Begin);
return(true);
dynamic ReadCollectionNode(uint lengthAndType)
{
int length = (int)Get3LsbBytes(lengthAndType);
ByamlNodeType nodeType = (ByamlNodeType)Get1MsbByte(lengthAndType);
switch (nodeType)
{
case ByamlNodeType.Array:
return(ReadArrayNode(_reader, length));
case ByamlNodeType.Dictionary:
return(ReadDictionaryNode(_reader, length));
case ByamlNodeType.StringArray:
return(ReadStringArrayNode(_reader, length));
case ByamlNodeType.PathArray:
return(ReadPathArrayNode(_reader, length));
default:
return(null); //should never happen
}
}
}
