haiku/headers/private/app/MessageUtils3.h

#ifndef MESSAGEUTILS_H
#define MESSAGEUTILS_H

#include <ByteOrder.h>
#include <DataIO.h>
#include <Entry.h>
#include <Message.h>
#include <Messenger.h>
#include <MessengerPrivate.h>
#include <SupportDefs.h>


uint32 _checksum_(const uchar *buf, int32 size);

namespace BPrivate {	// Only putting these here because Be did

status_t entry_ref_flatten(char* buffer, size_t* size, const entry_ref* ref);
status_t entry_ref_unflatten(entry_ref* ref, const char* buffer, size_t size);
status_t entry_ref_swap(char* buffer, size_t size);

size_t calc_padding(size_t size, size_t boundary);

}	// namespace BPrivate

//------------------------------------------------------------------------------
// _set_message_target_
/*!	\brief Sets the target of a message.

	\param message The message.
	\param token The target handler token.
	\param preferred Indicates whether to use the looper's preferred handler.
*/
inline void
_set_message_target_(BMessage *message, int32 token, bool preferred)
{
	message->fTarget = token;
	message->fPreferred = preferred;
}


// _set_message_reply_
/*!	\brief Sets a message's reply target.

	\param message The message.
	\param messenger The reply messenger.
*/
inline void
_set_message_reply_(BMessage *message, BMessenger messenger)
{
	BMessenger::Private messengerPrivate(messenger);
	message->fReplyTo.port = messengerPrivate.Port();
	message->fReplyTo.target = messengerPrivate.Token();
	message->fReplyTo.team = messengerPrivate.Team();
	message->fReplyTo.preferred = messengerPrivate.IsPreferredTarget();
}


inline int32
_get_message_target_(BMessage *msg)
{
	return msg->fTarget;
}


inline bool
_use_preferred_target_(BMessage *msg)
{
	return msg->fPreferred;
}


inline status_t
normalize_err(status_t err)
{
	return err >= 0 ? B_OK : err;
}


template<class T>
inline void
byte_swap(T &/*data*/)
{
	// Specialize for data types which actually swap
}


inline void
write_helper(BDataIO *stream, const void *data, size_t size)
{
	status_t error = stream->Write(data, size);
	if (error < B_OK)
		throw error;
}


class TReadHelper {
public:
							TReadHelper(BDataIO *stream)
								:	fStream(stream),
									fError(B_OK),
									fSwap(false)
							{
							}

							TReadHelper(BDataIO *stream, bool swap)
								:	fStream(stream),
									fError(B_OK),
									fSwap(swap)
							{
							}

		template<class T>
		inline void			operator()(T &data)
							{
								fError = fStream->Read((void *)&data, sizeof(T));
								if (fError > B_OK) {
									if (IsSwapping())
										byte_swap(data);
									return;
								}

								if (fError == 0)
									throw B_ERROR;
								throw fError;
							}

		template<class T>
		inline void			operator()(T data, size_t len)
							{
								fError = fStream->Read((void *)data, len);
								if (fError > B_OK)
									return;

								if (fError == 0)
									throw B_ERROR;
								throw fError;
							}

		status_t			Status() { return fError; };

		void				SetSwap(bool yesNo) { fSwap = yesNo; };
		bool				IsSwapping() { return fSwap; };

private:
		BDataIO				*fStream;
		status_t			fError;
		bool				fSwap;
};


class TChecksumHelper {
public:
							TChecksumHelper(uchar* buffer)
								:	fBuffer(buffer),
									fBufPtr(buffer)
							{
							}

		template<class T>
		inline void			Cache(const T &data)
							{
								*((T*)fBufPtr) = data;
								fBufPtr += sizeof (T);
							}

		int32    			CheckSum();

private:
		uchar				*fBuffer;
		uchar				*fBufPtr;
};


template<class T>
inline status_t
read_helper(BDataIO *stream, T &data)
{
	return normalize_err(stream->Read((void *)&data, sizeof(T)));
}


template<>
inline void
byte_swap(double &data)
{
	data = __swap_double(data);
}


template<>
inline void
byte_swap(float &data)
{
	data = __swap_float(data);
}


template<>
inline void
byte_swap(int64 &data)
{
	data = __swap_int64(data);
}


template<>
inline void
byte_swap(int32 &data)
{
	data = __swap_int32(data);
}


template<>
inline void
byte_swap(int16 &data)
{
	data = __swap_int16(data);
}


template<>
inline void
byte_swap(entry_ref &data)
{
	byte_swap(data.device);
	byte_swap(data.directory);
}

#endif	// MESSAGEUTILS_H