private Entry ReadEntry(CalithaBinReader reader)
{
Entry entry = EntryFactory.CreateEntry(reader);
if (entry == null)
throw new CGTStructureException("Invalid entry type at byte "+(stream.Position-1));
return entry;
}
/// <summary>
/// Reads a CGT and creates all the objects needed to create
/// a tokenizer and parser at a later time.
/// </summary>
/// <param name="stream">The CGT stream.</param>
private void ReadFile(Stream stream)
{
try
{
Reset();
this.stream = stream;
CalithaBinReader reader = new CalithaBinReader(stream);
string header = "";
try
{
header = reader.ReadUnicodeString();
if (! header.StartsWith("GOLD"))
throw new CGTStructureException("File header is invalid");
}
catch (EndOfStreamException e)
{
throw new CGTStructureException("File header is invalid",e);
}
RecordCollection records = new RecordCollection();
while (!(stream.Position == stream.Length))
{
records.Add(ReadRecord(reader));
}
structure = new CGTStructure(header,records);
content = new CGTContent(structure);
dfaStates = CreateDFAStates(content);
parserStates = CreateParserStates(content);
}
finally
{
stream.Close();
}
}
static public Entry CreateEntry(CalithaBinReader reader)
{
Entry entry = null;
byte entryType = reader.ReadByte();
switch (entryType)
{
case 69: // 'E'
entry = new EmptyEntry();
break;
case 98: // 'b'
entry = new ByteEntry(reader);
break;
case 66: // 'B'
entry = new BooleanEntry(reader);
break;
case 73: // 'I'
entry = new IntegerEntry(reader);
break;
case 83: // 'S'
entry = new StringEntry(reader);
break;
default: //Unknown
throw new CGTStructureException("Unknown entry type");
}
return(entry);
}
private Record ReadRecord(CalithaBinReader reader)
{
Record record = new Record();
byte entriesHeader = reader.ReadByte();
if (entriesHeader != 77) // 'M'
{
throw new CGTStructureException("Invalid entries header at byte "+(stream.Position-1));
}
ushort entriesCount = reader.ReadUInt16();
for (int i=0;i<entriesCount;i++)
{
record.Entries.Add(ReadEntry(reader));
}
return record;
}
public StringEntry(CalithaBinReader reader)
{
value = reader.ReadUnicodeString();
}
public IntegerEntry(CalithaBinReader reader)
{
value = reader.ReadInt16();
}
public BooleanEntry(CalithaBinReader reader)
{
value = reader.ReadBoolean();
}
public ByteEntry(CalithaBinReader reader)
{
value = reader.ReadByte();
}
