private bool TryReadMacsBugSymbol(out string symbol)
{
var offset = rdr.Offset;
byte b;
symbol = null;
if (!rdr.TryReadByte(out b))
{
return(false);
}
int symLength = 0;
// May have read the length byte.
if (b == 0x80)
{
// long symbol: next byte is the 8-bit length.
if (!rdr.TryReadByte(out b) || b == 0)
{
rdr.Offset = offset;
return(false);
}
symLength = b;
}
else if (0x81 <= b && b < 0xA0)
{
symLength = b - 0x80;
}
else
{
rdr.Offset = offset;
return(false);
}
// Now try reading `symLength` valid 8-bit chars.
var symOffset = rdr.Offset;
var sb = new StringBuilder();
for (int i = 0; i < symLength; ++i)
{
if (!rdr.TryReadByte(out b))
{
rdr.Offset = offset;
return(false);
}
sb.Append((char)b);
}
if ((rdr.Offset & 1) == 1)
{
++rdr.Offset;
}
symbol = sb.ToString();
if (!this.reValidVariableLengthProcedureName.IsMatch(symbol))
{
symbol = null;
rdr.Offset = offset;
return(false);
}
return(true);
}