internal void ClearAttributes()
{
TagEnum = Bms1Tag.Attribute;
ObjectName = null;
ObjectType = null;
CollectionElementCount = Bms1Length.None; // -1
CollectionElementBaseType = -1;
NameValues = null;
Namespaces = null;
TagSetNumber = 0;
IsCharacterType = false;
}
public void ReadTag(BinaryReader stream)
{
TagEnum = Bms1Tag.UnknownValue;
IsArrayData = false;
DataLength = 0;
_lengthSpecifier = 0;
BlockTypeId = -1;
ChecksumAvailable = false;
TagByte = stream.ReadByte(); // 0..255
if (TagByte < 10)
{
if (TagByte == 0)
{
throw new Bms1Exception("invalid value tag 0");
}
else if (TagByte == 7) TagEnum = Bms1Tag.Null;
else if (TagByte == 8) TagEnum = Bms1Tag.BoolFalse;
else if (TagByte == 9) TagEnum = Bms1Tag.BoolTrue;
}
else if (TagByte < 170) // Values
{
EvaluateDataLength(stream);
if (DataLength == Bms1Length.Undefined)
{
throw new Bms1Exception("undefined data length specifier 3");
}
if (TagByte < 150)
{
// Known value tags
TagEnum = (Bms1Tag)(TagByte - _lengthSpecifier);
}
}
else if (TagByte < 245) // Attributes --> skip unused data
{
EvaluateDataLength(stream);
TagEnum = Bms1Tag.Attribute;
var attributeGroup = TagByte; // special handling for 240 and above
if (TagByte < 240)
{
attributeGroup -= _lengthSpecifier; // normal groups below 240
}
switch (attributeGroup)
{
case 170:
ObjectName = ReadDataString(stream);
break;
case 180:
ObjectType = ReadDataString(stream);
break;
case 190:
if (NameValues == null)
{
NameValues = new List<string>();
}
NameValues.Add(ReadDataString(stream));
break;
case 200:
if (Namespaces == null)
{
Namespaces = new List<string>();
}
Namespaces.Add(ReadDataString(stream));
break;
case 230:
if (_lengthSpecifier == 3) // 233
{
CollectionElementCount = Bms1Length.Open; // open collection
}
else if (_lengthSpecifier <= 4) // 230, 231, 232, 234
{
DataLength = _lengthSpecifier;
var len = ReadDataUInt(stream);
if (len > Int32.MaxValue) // TODO Max
{
throw new Bms1Exception("collection length " + len + " out of bounds for attribute " + TagByte);
}
CollectionElementCount = (int)len; // >=0: CollectionAtribute is set.
}
else
{
SkipData(stream); // yet unknown attributes
}
break;
case 240: IsCharacterType = true; break;
case 241: TagSetNumber = 1; break;
case 242: TagSetNumber = 2; break;
case 243: TagSetNumber = 3; break;
case 244: break;
default:
SkipData(stream);
break;
}
}
else // >= 245: Framing tags with specific data length
{
switch (TagByte)
{
case 245:
TagEnum = Bms1Tag.MessageStart;
var pattern = stream.ReadUInt32();
if (pattern != 0x544D4201) // decimal data [01, 66, 77, 83]
{
throw new Bms1Exception(string.Format("invalid message start pattern 0x{0:X}", pattern));
}
break;
case 246: TagEnum = Bms1Tag.BlockStart; break;
case 247: TagEnum = Bms1Tag.BlockStart; BlockTypeId = stream.ReadUInt16(); break;
case 248: TagEnum = Bms1Tag.NullBlock; BlockTypeId = stream.ReadUInt16(); break;
case 249: TagEnum = Bms1Tag.BlockEnd; break;
case 250: TagEnum = Bms1Tag.BlockEnd; Checksum = stream.ReadUInt32(); ChecksumAvailable = true; break;
case 251: TagEnum = Bms1Tag.MessageFooter; break;
case 252: TagEnum = Bms1Tag.MessageEnd; break;
case 253: stream.ReadUInt32(); break;
case 254: stream.ReadUInt32(); break;
default:
throw new Bms1Exception("invalid framing tag = " + TagByte); // 255
}
}
}
public void WriteDataSInt(Bms1Tag tag, Int32 data)
{
WriteAttributes();
if (data == 0)
{
Stream.Write((byte)tag);
}
else if (data > 0)
{
// Positive, most significant bit must be zero
if (data < 0x80)
{
Stream.Write((byte)(tag + Bms1LengthSpec.L1));
Stream.Write((SByte)(data));
}
else if (data < 0x8000)
{
Stream.Write((byte)(tag + Bms1LengthSpec.L2));
Stream.Write((Int16)(data));
}
else
{
Stream.Write((byte)(tag + Bms1LengthSpec.L4));
Stream.Write(data);
}
}
else
{ // Negative, most significant bit must be set
if (data >= -0x80)// > 0xFFFFFF70)
{
Stream.Write((byte)(tag + Bms1LengthSpec.L1));
Stream.Write((SByte)(data));
}
else if (data >= -0x8000) // > 0xFFFF7000)
{
Stream.Write((byte)(tag + Bms1LengthSpec.L2));
Stream.Write((Int16)(data));
}
else
{
Stream.Write((byte)(tag + Bms1LengthSpec.L4));
Stream.Write(data);
}
}
}
public void WriteDataSInt64(Bms1Tag tag, Int64 data)
{
if (data >= 0)
{
if (data < 0x80000000)
{
WriteDataSInt(tag, (Int32)data);
}
else
{
WriteAttributes();
Stream.Write((byte)(tag + Bms1LengthSpec.L8));
Stream.Write(data);
}
}
else
{
if (data >= -0x80000000)
{
WriteDataSInt(tag, (Int32)data);
}
else
{
WriteAttributes();
Stream.Write((byte)(tag + Bms1LengthSpec.L8));
Stream.Write(data);
}
}
}
public void WriteDataUInt64(Bms1Tag tag, UInt64 data)
{
WriteAttributes();
if (data <= 0xFFFFFFFF)
{
WriteTagAndUInt((byte)tag, (UInt32)data);
}
else
{
Stream.Write((byte)(tag + Bms1LengthSpec.L8));
Stream.Write(data);
}
}
public void WriteDataUInt(Bms1Tag tag, UInt32 data)
{
WriteAttributes();
WriteTagAndUInt((byte)tag, data);
}
public void WriteDataString(Bms1Tag tag, string data)
{
WriteAttributes();
WriteTagAndString((byte)tag, data);
}
public void WriteAttributesAndTag(Bms1Tag tag, int dataLength)
{
WriteAttributes();
WriteTagAndLength((byte)tag, dataLength);
}
public void WriteAttributesAndTag(Bms1Tag tag)
{
WriteAttributes();
Stream.Write((byte)tag);
}
