/*封信，准备发送*/
MAILBOX_EXTERN int mailbox_sealup_buff(struct mb_buff * mb_buf , unsigned int usr_size)
{
struct mb_mail mail = {0};
struct mb_queue *m_queue = MAILBOX_NULL;
unsigned int time_stamp;
unsigned long mail_addr;
m_queue = &mb_buf->mail_queue;
/*判断是否超过单次发送最大大小*/
if (usr_size > (mb_buf->config->single_max - sizeof(struct mb_mail) )){
return (int) mailbox_logerro_p2(MAILBOX_ERR_GUT_WRITE_EXCEED_MAX_SIZE,
usr_size ,mb_buf->mailcode);
} else {
}
time_stamp = (unsigned int)mailbox_get_timestamp();
/*填充消息头*/
mail.ulPartition = MAILBOX_MSGHEAD_NUMBER;
mail.ulWriteSlice = time_stamp;
mail.ulReadSlice = 0;
mail.ulPriority = 0;/*此属性和OM核对已废弃，不使用*/
mail.ulSeqNum = mb_buf->seq_num;
mail.ulMsgLength = usr_size ;
mail.ulMailCode = mb_buf->mailcode;
if (MAILBOX_SEQNUM_START == mb_buf->seq_num) {
(void)mailbox_logerro_p1(MAILBOX_INFO_SEND_FIRST_MAIL, mb_buf->mailcode);
}
mb_buf->seq_num++;
/*向邮箱队列中写入邮件头，并更新队列状态记录临时结构体*/
mail_addr = m_queue->front;
(void)mailbox_queue_write(m_queue, (char*)(&mail), sizeof(struct mb_mail));
/*更新邮箱环形缓存信息*/
m_queue->front = mailbox_align_size(mb_buf->usr_queue.front, MAILBOX_ALIGN);
(void)mailbox_flush_buff(mb_buf); /*把邮箱通道操作符的信息写回邮箱头。*/
#ifdef MAILBOX_OPEN_MNTN
mailbox_record_send(&(mb_buf->mntn), mb_buf->mailcode, time_stamp, mail_addr);
#endif
/*准备下一封邮件写入*/
return mailbox_init_usr_queue(mb_buf);
}
/*****************************************************************************
函 数 名 : mailbox_read_mail
接口类型 : 对内接口
功能描述 : 读取并处理一封邮箱的正文数据内容,接受邮箱数据的数据层入口，
并且调用上层注册的邮件数据处理回调函数
输入参数 : mb_buff* mbuff - 邮箱通道操作符
输出参数 : 无
返 回 值 : 读取的邮件数据长度，包括邮件头，返回0表示失败。
调用函数 :
被调函数 :
修改历史 :
1.日 期 : 2012年9月24日
作 者 : 莫南 00176101
修改内容 : 新生成函数
*****************************************************************************/
MAILBOX_LOCAL long mailbox_read_mail(struct mb_buff *mbuff)
{
struct mb_mail mail;
struct mb_cb *read_cb = MAILBOX_NULL;/*此邮箱通道的功能回调函数队列*/
struct mb_queue tmp_queue;
struct mb_queue *usr_queue = MAILBOX_NULL;
struct mb_queue *m_queue = MAILBOX_NULL;
unsigned long use_id;
unsigned long slice_start;
unsigned long to_bottom;
void *usr_handle;
void *usr_data;
void (*usr_func)(void *mbuf, void *handle, void *data);
m_queue = &(mbuff->mail_queue);
usr_queue = &(mbuff->usr_queue);
mailbox_memcpy((void *) usr_queue, (const void *) m_queue, sizeof(struct mb_queue));
/*保存临时队列状态,交换读写指针。*/
tmp_queue.base = usr_queue->base;
tmp_queue.length = usr_queue->length;
tmp_queue.front = usr_queue->rear;
tmp_queue.rear = usr_queue->front;
/*读取邮件的头信息*/
mailbox_queue_read(usr_queue, (char*)&mail, sizeof(struct mb_mail));
/*1.检查邮件头，判断读到的消息是否存在异常，包括SN号是否连续、消息滞留时间是否过长。
2.填充信息读取时间*/
mailbox_check_mail(mbuff, &mail, m_queue->rear);
/*把读取时间写回邮箱队列*/
mailbox_queue_write(&tmp_queue, (char*)&mail, sizeof(struct mb_mail));
use_id = mailbox_get_use_id(mail.ulMailCode);
/*检查Use ID的有效性*/
if (use_id >= mailbox_get_use_id(mbuff->config->butt_id)) {
mailbox_logerro_p1(MAILBOX_ERR_GUT_INVALID_USER_ID, mail.ulMailCode);
goto EXIT;
}
read_cb = &mbuff->read_cb[use_id];
mailbox_mutex_lock(&mbuff->mutex);
usr_handle = read_cb->handle;
usr_data = read_cb->data;
usr_func = read_cb->func;
mailbox_mutex_unlock(&mbuff->mutex);
if (MAILBOX_NULL != usr_func) {
usr_queue->size = mail.ulMsgLength;
slice_start = mailbox_get_timestamp();
usr_func(mbuff, usr_handle , usr_data);
/*记录可维可测信息*/
#ifdef MAILBOX_OPEN_MNTN
mailbox_record_receive(&mbuff->mntn, mbuff->channel_id, slice_start);
#endif
} else {
mailbox_logerro_p1(MAILBOX_ERR_GUT_READ_CALLBACK_NOT_FIND, mail.ulMailCode);
}
EXIT:
/*不管用户有没有用回调读数据，读了多少数据，邮箱队列的读指针都需要按实际
大小偏移，以保证后面邮件读取的正确性。*/
to_bottom = (m_queue->base + m_queue->length) - m_queue->rear;
if (to_bottom > (mail.ulMsgLength + sizeof(struct mb_mail))) {
m_queue->rear += (mail.ulMsgLength + sizeof(struct mb_mail));
} else {
m_queue->rear = m_queue->base + ((mail.ulMsgLength +
sizeof(struct mb_mail)) - to_bottom);
}
/*读保证指针4字节对齐*/
m_queue->rear = mailbox_align_size(m_queue->rear, MAILBOX_ALIGN);
return (mailbox_align_size(mail.ulMsgLength, MAILBOX_ALIGN)
+ sizeof(struct mb_mail));
}
