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N3783: Network Byte Order Conversion -- Robert Pratte

By Blog Staff | Oct 1, 2013 08:28 AM | Tags: None

Note: This paper was adopted on Saturday at the Chicago meeting for the new Networking TS.

A new WG21 paper is available. A copy is linked below, and the paper will also appear in the next normal WG21 mailing. If you are not a committee member, please use the comments section below or the std-proposals forum for public discussion.

Document number: N3783

Date: 2013-09-27

Network Byte Order Conversion

by Robert Pratte

Excerpt:

This proposal adds support to C++ for converting between host and network byte order.

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jjlee said on Oct 9, 2013 09:31 AM:

I think it is not easy to use it.
How to convert FLV UI24 (24 bit unsigned int) by current spec?
How to convert WEBM signed and unsigned interger (1 ~ 8 bytes)?

Could we just have something like below? (Just an idea for thinking, might not be correct)



namespace TEST

{



enum endian

{

    little  = 0,

    big     = 1,

    network = big,

#ifdef INTEL_CPU

    host    = little, 

#elif XXX_BIG_ENDIAN_CPU

    host    = big,

#elif YYY_LITTLE_ENDIAN_CPU

    host    = big,

#else

#error unknown CPU

#endif

};



typedef endian EndianFrom;

typedef endian EndianTo;



template <EndianFrom, EndianTo> class EndianConversion

{

public:

    // TFrom and TTo could be any of :

    // int8_t, int16_t, int24_t, int32_t, int40_t, int48_t, int56_t, int64_t,

    // uint8_t, uint16_t, uint24_t, uint32_t, uint40_t, uint48_t, uint56_t, uint64_t

    // and end user could even provide his special type

    template <typename TFrom, typename TTo> void convert(const TFrom&, TTo&);

};

};


Above convert() could even throw an exception if conversion is not possible.

There could be some little endian data in FLV (SoundFormat=3, Linear PCM little endian) and WEBM, how can a big endian host to handle it with current spec?