/// <summary>
/// Parses a database row.
/// </summary>
/// <returns></returns>
SType ParseDBRow()
{
var header = GetObject() as SObjectType;
if (header == null)
{
throw new ParserException("DBRow header not found");
}
if (!header.IsDBRowDescriptor)
{
throw new ParserException("Bad DBRow descriptor name");
}
var fields = header.Members.First().Members.First(
member => member is STupleType).Members.First().Members.Cast <STupleType>().ToList();
if (!fields.Any())
{
return(new SNoneType());
}
// Check for double marker in stream (usually found in a file with one DBRow)
var length = m_reader.ReadLength();
if (m_reader.IsDoubleMarker(length))
{
length = m_reader.ReadLength();
}
var unpackedDataSize = GetUnpackedDataSize(fields);
var compressedData = m_reader.ReadBytes(length);
var uncompressedData = Rle_Unpack(compressedData, unpackedDataSize);
var reader = new CachedFileReader(uncompressedData, false);
// Find the maximum number of elements for each field member
var maxElements = fields.Select(field => field.Members.Count).Concat(new[] { 0 }).Max();
// The size of SDict must be the ammount of entries stored,
// multiplied by the max elements of each field member
var dict = new SDictType((uint)(fields.Count() * maxElements));
var pass = 1;
while (pass < 7)
{
// The pattern for what data to read on each pass is:
// 1: 64 bit (Int64, Double)
// 2: 32 bit (Int32, Single)
// 3: 16 bit (Int16)
// 4: 8 bit (Byte)
// 5: 1 bit (Boolean)
// 6: strings
foreach (var field in fields)
{
var fieldName = field.Members.First();
var fieldType = (SLongType)field.Members.Last();
var dbType = (DbTypes)fieldType.Value;
byte boolCount = 0;
var boolBuffer = false;
SType obj = null;
switch (dbType)
{
case DbTypes.Short:
case DbTypes.UShort:
if (pass == 3)
{
obj = new SShortType(reader.ReadShort());
}
break;
case DbTypes.Int:
case DbTypes.UInt:
if (pass == 2)
{
obj = new SIntType(reader.ReadInt());
}
break;
case DbTypes.Float:
if (pass == 2)
{
obj = new SDoubleType(reader.ReadFloat());
}
break;
case DbTypes.Double:
if (pass == 1)
{
obj = new SDoubleType(reader.ReadDouble());
}
break;
case DbTypes.Currency:
if (pass == 1)
{
obj = new SDoubleType(reader.ReadLong() / 10000.0);
}
break;
case DbTypes.Long:
case DbTypes.ULong:
case DbTypes.Filetime: // Timestamp
case DbTypes.DBTimestamp:
if (pass == 1)
{
obj = new SLongType(reader.ReadLong());
}
break;
case DbTypes.Bool:
if (pass == 5)
{
if (boolCount == 0)
{
boolBuffer = Convert.ToBoolean(reader.ReadByte());
boolCount++;
}
obj = boolBuffer && boolCount != 0
? new SBooleanType(1)
: new SBooleanType(0);
}
break;
case DbTypes.Byte:
case DbTypes.UByte:
if (pass == 4)
{
obj = new SByteType(reader.ReadByte());
}
break;
case DbTypes.Bytes: // String types
case DbTypes.String:
case DbTypes.WideString:
if (pass == 6)
{
obj = GetObject();
}
break;
default:
throw new ParserException("Unhandled db column type: " + dbType);
}
if (obj == null)
{
continue;
}
dict.AddMember(obj);
dict.AddMember(fieldName.Clone());
}
pass++;
}
var parsedDBRow = new STupleType(2);
parsedDBRow.AddMember(header);
parsedDBRow.AddMember(dict);
return(parsedDBRow);
}