/*
 * =====================================================================================
 *
 *       Filename:  msg.cpp
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月24日 16时48分42秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Li Chao (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#include "msg.h"

namespace bhome_shm {
	

bool MsgMetaV1::Parse(const void *p)
{
    assert(p);
    *this = *static_cast<const MsgMetaV1*>(p);
    return tag_ == kMsgMetaTag;
}

void MsgMetaV1::Pack(void *p)
{
    *static_cast<MsgMetaV1*>(p) = *this;
}

bool Msg::Build(SharedMemory &shm, const MQId &src_id, const void *data, const size_t size, const bool refcount)
{
    if (!data || !size) {
        return false;
    }
    void *p = shm.Alloc(sizeof(MsgMetaV1) + size);
    if (!p) {
        return false;
    }
    RefCount *rc = 0;
    if (refcount) {
        rc = shm.New<RefCount>();
        if (!rc) {
            shm.Dealloc(p);
            return false;
        }
    }
    MsgMetaV1 meta;
    meta.data_size_ = size;
    meta.src_id_ = src_id;
    meta.Pack(p);
    memcpy(static_cast<char *>(p) + sizeof(meta), data, size);
    Msg(p, rc).swap(*this);
    return true;

}

void Msg::FreeFrom(SharedMemory &shm)
{
    shm.Dealloc(ptr_);
    shm.Delete(count_);
}
} // namespace bhome_shm