private static IntPtr PrepareIOStruct(IPhysFSStream ioStream)
{
PHYSFS_Io ioStruct = new PHYSFS_Io {
Version = ioStream.Version,
Opaque = IntPtr.Zero,
Seek = (IntPtr io, ulong offset) => {
return(ioStream.Seek(offset) ? 1 : 0);
},
Tell = (IntPtr io) => {
return(ioStream.Tell());
},
Length = (IntPtr io) => {
return(ioStream.Length());
},
Duplicate = (IntPtr io) => {
IPhysFSStream ioStreamClone = ioStream.Duplicate();
IntPtr ioStructClonePtr = PrepareIOStruct(ioStreamClone);
return(ioStructClonePtr);
},
Flush = (IntPtr io) => {
return(ioStream.Flush() ? 1 : 0);
}
};
if (ioStream.CanRead)
{
ioStruct.Read = (IntPtr io, IntPtr buf, ulong len) => {
byte[] buffer = new byte[len];
long bytesRead = ioStream.Read(buffer, len);
if (bytesRead > 0L)
{
Helper.MarshalCopy(buffer, 0UL, buf, len);
}
return(bytesRead);
};
}
if (ioStream.CanWrite)
{
ioStruct.Write = (IntPtr io, IntPtr buf, ulong len) => {
byte[] buffer = new byte[len];
Helper.MarshalCopy(buf, buffer, 0UL, len);
long bytesWritten = ioStream.Write(buffer, len);
return(bytesWritten);
};
}
IntPtr ioPtr = Marshal.AllocHGlobal(Marshal.SizeOf <PHYSFS_Io>());
ioStruct.Destroy = (IntPtr io) => {
ioStream.Destroy();
Marshal.FreeHGlobal(ioPtr); // we must free this, otherwise no one will do
};
Marshal.StructureToPtr(ioStruct, ioPtr, fDeleteOld: false);
return(ioPtr);
}
private static IPhysFSStream PrepareIOStream(IntPtr io)
{
PHYSFS_Io physfsIo = Marshal.PtrToStructure <PHYSFS_Io>(io);
PhysFSInternalStream internalStream = new PhysFSInternalStream {
ReadFunction = (byte[] buffer, ulong len) => {
IntPtr buf = Marshal.AllocHGlobal(buffer.Length * Marshal.SizeOf <byte>());
long bytesRead = physfsIo.Read(io, buf, len);
Helper.MarshalCopy(buf, buffer, 0UL, len);
Marshal.FreeHGlobal(buf);
return(bytesRead);
},
WriteFunction = (byte[] buffer, ulong len) => {
IntPtr buf = Marshal.AllocHGlobal(buffer.Length * Marshal.SizeOf <byte>());
Helper.MarshalCopy(buffer, 0UL, buf, len);
long bytesWritten = physfsIo.Write(io, buf, len);
Marshal.FreeHGlobal(buf);
return(bytesWritten);
},
SeekFunction = (ulong offset) => {
int seekRet = physfsIo.Seek(io, offset);
return(seekRet != 0);
},
TellFunction = () => {
return(physfsIo.Tell(io));
},
LengthFunction = () => {
return(physfsIo.Length(io));
},
DuplicateFunction = () => {
IntPtr ioClone = physfsIo.Duplicate(io);
return(PrepareIOStream(ioClone));
},
FlushFunction = () => {
return(physfsIo.Flush(io) != 0);
},
DestroyFunction = () => {
physfsIo.Destroy(io);
}
};
return(internalStream);
}