private static string?ReadString(DuplicatableStream s, uint maxBytes, EndianUtils.Endianness e)
{
if (maxBytes < 8)
{
// can't be a valid string
s.DiscardBytes(maxBytes);
return(null);
}
ulong rawlength = s.ReadUInt64(e);
ulong length = (rawlength & 0x7ffffffffffffffful);
bool hasOffset = (rawlength & 0x8000000000000000ul) > 0;
if (hasOffset)
{
// format is 8 bytes length, then 8 bytes position of string in data
if (maxBytes < 16)
{
// can't be valid
s.DiscardBytes(maxBytes - 8);
return(null);
}
ulong offset = s.ReadUInt64(e);
long p = s.Position + (maxBytes - 16);
s.Position = (long)offset;
string str = s.ReadSizedString((long)length, TextUtils.GameTextEncoding.UTF8);
s.Position = p;
return(str);
}
else
{
// format is 8 bytes length, then [number read] bytes string
uint restBytes = maxBytes - 8;
if (length > restBytes)
{
// can't be a valid string
s.DiscardBytes(restBytes);
return(null);
}
string str = s.ReadSizedString((long)length, TextUtils.GameTextEncoding.UTF8);
s.DiscardBytes(restBytes - length);
return(str);
}
}
private bool LoadFile(DuplicatableStream inputStream, EndianUtils.Endianness?endianParam, TextUtils.GameTextEncoding encoding)
{
DuplicatableStream stream = inputStream.Duplicate();
stream.Position = 0;
EndianUtils.Endianness endian;
if (endianParam == null)
{
uint magic = stream.ReadUInt32().FromEndian(EndianUtils.Endianness.BigEndian);
if (magic == 0x53453320)
{
endian = EndianUtils.Endianness.BigEndian;
}
else if (magic == 0x20334553)
{
endian = EndianUtils.Endianness.LittleEndian;
}
else
{
Console.WriteLine("Invalid magic: " + magic);
return(false);
}
}
else
{
endian = endianParam.Value;
uint magic = stream.ReadUInt32(endian);
if (magic != 0x53453320)
{
Console.WriteLine("Invalid magic: " + magic);
return(false);
}
}
this.Endian = endian;
uint lengthOfFilenameSection = stream.ReadUInt32(endian); // probably?
uint startOfFilenameSection = stream.ReadUInt32(endian); // probably?
DataBegin = stream.ReadUInt32(endian);
stream.Position = startOfFilenameSection;
uint magicOfFilenameSection = stream.ReadUInt32(endian);
FileCount = stream.ReadUInt32(endian);
Filenames = new List <string>((int)FileCount);
for (uint i = 0; i < FileCount; ++i)
{
Filenames.Add(stream.ReadSizedString(48, encoding).TrimNull());
}
Data = stream;
return(true);
}
