/* SPDX-License-Identifier: MPL-2.0 */

#include "precompiled.hpp"

#include "encoder.hpp"

#include "v1_encoder.hpp"

#include "msg.hpp"

#include "wire.hpp"

#include <limits.h>

zmq::v1_encoder_t::v1_encoder_t (size_t bufsize_) :

    encoder_base_t<v1_encoder_t> (bufsize_)

{

    //  Write 0 bytes to the batch and go to message_ready state.

    next_step (NULL, 0, &v1_encoder_t::message_ready, true);

}

zmq::v1_encoder_t::~v1_encoder_t ()

{

}

void zmq::v1_encoder_t::size_ready ()

{

    //  Write message body into the buffer.

    next_step (in_progress ()->data (), in_progress ()->size (),

               &v1_encoder_t::message_ready, true);

}

void zmq::v1_encoder_t::message_ready ()

{

    size_t header_size = 2; // flags byte + size byte

    //  Get the message size.

    size_t size = in_progress ()->size ();

    //  Account for the 'flags' byte.

    size++;

    //  Account for the subscribe/cancel byte.

    if (in_progress ()->is_subscribe () || in_progress ()->is_cancel ())

        size++;

    //  For messages less than 255 bytes long, write one byte of message size.

    //  For longer messages write 0xff escape character followed by 8-byte

    //  message size. In both cases 'flags' field follows.

    if (size < UCHAR_MAX) {

        _tmpbuf[0] = static_cast<unsigned char> (size);

        _tmpbuf[1] = (in_progress ()->flags () & msg_t::more);

    } else {

        _tmpbuf[0] = UCHAR_MAX;

        put_uint64 (_tmpbuf + 1, size);

        _tmpbuf[9] = (in_progress ()->flags () & msg_t::more);

        header_size = 10;

    }

    //  Encode the subscribe/cancel byte. This is done in the encoder as

    //  opposed to when the subscribe message is created to allow different

    //  protocol behaviour on the wire in the v3.1 and legacy encoders.

    //  It results in the work being done multiple times in case the sub

    //  is sending the subscription/cancel to multiple pubs, but it cannot

    //  be avoided. This processing can be moved to xsub once support for

    //  ZMTP < 3.1 is dropped.

    if (in_progress ()->is_subscribe ())

        _tmpbuf[header_size++] = 1;

    else if (in_progress ()->is_cancel ())

        _tmpbuf[header_size++] = 0;

    next_step (_tmpbuf, header_size, &v1_encoder_t::size_ready, false);

}