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//*****************************************************************************
//
//! \file socket.c
//! \brief SOCKET APIs Implements file.
//! \details SOCKET APIs like as Berkeley Socket APIs. 
//! \version 1.0.3
//! \date 2013/10/21
//! \par  Revision history
//!       <2015/02/05> Notice
//!        The version history is not updated after this point.
//!        Download the latest version directly from GitHub. Please visit the our GitHub repository for ioLibrary.
//!        >> https://github.com/Wiznet/ioLibrary_Driver
//!       <2014/05/01> V1.0.3. Refer to M20140501
//!         1. Implicit type casting -> Explicit type casting.
//!         2. replace 0x01 with PACK_REMAINED in recvfrom()
//!         3. Validation a destination ip in connect() & sendto(): 
//!            It occurs a fatal error on converting unint32 address if uint8* addr parameter is not aligned by 4byte address.
//!            Copy 4 byte addr value into temporary uint32 variable and then compares it.
//!       <2013/12/20> V1.0.2 Refer to M20131220
//!                    Remove Warning.
//!       <2013/11/04> V1.0.1 2nd Release. Refer to "20131104".
//!                    In sendto(), Add to clear timeout interrupt status (Sn_IR_TIMEOUT)
//!       <2013/10/21> 1st Release
//! \author MidnightCow
//! \copyright
//!
//! Copyright (c)  2013, WIZnet Co., LTD.
//! All rights reserved.
//! 
//! Redistribution and use in source and binary forms, with or without 
//! modification, are permitted provided that the following conditions 
//! are met: 
//! 
//!     * Redistributions of source code must retain the above copyright 
//! notice, this list of conditions and the following disclaimer. 
//!     * Redistributions in binary form must reproduce the above copyright
//! notice, this list of conditions and the following disclaimer in the
//! documentation and/or other materials provided with the distribution. 
//!     * Neither the name of the <ORGANIZATION> nor the names of its 
//! contributors may be used to endorse or promote products derived 
//! from this software without specific prior written permission. 
//! 
//! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//! AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
//! IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
//! ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
//! LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
//! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
//! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
//! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
//! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
//! THE POSSIBILITY OF SUCH DAMAGE.
//
//*****************************************************************************
#include "socket.h"

//M20150401 : Typing Error
#define SOCK_ANY_PORT_NUM  0xC000

static uint16_t sock_any_port = SOCK_ANY_PORT_NUM;
static uint16_t sock_io_mode = 0;
static uint16_t sock_is_sending = 0;

static uint16_t sock_remained_size[_WIZCHIP_SOCK_NUM_] = {0,0,};

//M20150601 : For extern decleation
uint8_t  sock_pack_info[_WIZCHIP_SOCK_NUM_] = {0,};




#define CHECK_SOCKNUM()   \
   do{                    \
      if(sn > _WIZCHIP_SOCK_NUM_) return SOCKERR_SOCKNUM;   \
   }while(0);             \

#define CHECK_SOCKMODE(mode)  \
   do{                     \
      if((getSn_MR(sn) & 0x0F) != mode) return SOCKERR_SOCKMODE;  \
   }while(0);              \

#define CHECK_SOCKINIT()   \
   do{                     \
      if((getSn_SR(sn) != SOCK_INIT)) return SOCKERR_SOCKINIT; \
   }while(0);              \

#define CHECK_SOCKDATA()   \
   do{                     \
      if(len == 0) return SOCKERR_DATALEN;   \
   }while(0);              \



int8_t socket(uint8_t sn, uint8_t protocol, uint16_t port, uint8_t flag)
{
  CHECK_SOCKNUM();
  switch(protocol)
  {
      case Sn_MR_TCP :
         {
            //M20150601 : Fixed the warning - taddr will never be NULL    
            uint32_t taddr;
            getSIPR((uint8_t*)&taddr);
            if(taddr == 0) return SOCKERR_SOCKINIT;
         }
      case Sn_MR_UDP :
      case Sn_MR_MACRAW :
         break;
      case Sn_MR_IPRAW :
      case Sn_MR_PPPoE :
         break;
      default :
         return SOCKERR_SOCKMODE;
  }
  //M20150601 : For SF_TCP_ALIGN & W5300
  if((flag & 0x04) != 0) return SOCKERR_SOCKFLAG;     
  if(flag != 0)
  {
     switch(protocol)
     {
        case Sn_MR_TCP:
         //M20150601 :  For SF_TCP_ALIGN & W5300        
            if((flag & (SF_TCP_NODELAY|SF_IO_NONBLOCK))==0) return SOCKERR_SOCKFLAG;    
           break;
        case Sn_MR_UDP:
           if(flag & SF_IGMP_VER2)
           {
              if((flag & SF_MULTI_ENABLE)==0) return SOCKERR_SOCKFLAG;
           }        
           break;
        default:
           break;
     }
   }
  close(sn);
  setSn_MR(sn, (protocol | (flag & 0xF0)));     // PROTOCOL--0X01 FLAG--0X20  设置Sn_MR BIT5=1 BIT0=1
  if(!port)
  {
     port = sock_any_port++;
     if(sock_any_port == 0xFFF0) sock_any_port = SOCK_ANY_PORT_NUM;
  }
   setSn_PORT(sn,port);          // 将端口写入寄存器  此处绑定了端口sn与port 2020-2-5
   setSn_CR(sn,Sn_CR_OPEN);      // 开启 SOCKET
   while(getSn_CR(sn));
   //A20150401 : For release the previous sock_io_mode
   sock_io_mode &= ~(1 <<sn);
   sock_io_mode |= ((flag & SF_IO_NONBLOCK) << sn);   
   sock_is_sending &= ~(1<<sn);
   sock_remained_size[sn] = 0;
   //M20150601 : repalce 0 with PACK_COMPLETED
   sock_pack_info[sn] = PACK_COMPLETED;
   
   while(getSn_SR(sn) == SOCK_CLOSED);
   return (int8_t)sn;
}     

int8_t close(uint8_t sn)
{
  CHECK_SOCKNUM();
  setSn_CR(sn,Sn_CR_CLOSE);     // 0X10--CLOSE命令
   /* wait to process the command... */
  while( getSn_CR(sn) );       // 0X00--执行完成
  /* clear all interrupt of the socket. */
  setSn_IR(sn, 0xFF);          // 写入1 清除
  //A20150401 : Release the sock_io_mode of socket n.
  sock_io_mode &= ~(1<<sn);
  //
  sock_is_sending &= ~(1<<sn);
  sock_remained_size[sn] = 0;
  sock_pack_info[sn] = 0;
  while(getSn_SR(sn) != SOCK_CLOSED);   // SOCKET状态值 是否关闭
  return SOCK_OK;
}

int8_t listen(uint8_t sn)
{
  CHECK_SOCKNUM();
   CHECK_SOCKMODE(Sn_MR_TCP);
  CHECK_SOCKINIT();
  setSn_CR(sn,Sn_CR_LISTEN);
  while(getSn_CR(sn));
   while(getSn_SR(sn) != SOCK_LISTEN)
   {
         close(sn);
         return SOCKERR_SOCKCLOSED;
   }
   return SOCK_OK;
}


int8_t connect(uint8_t sn, uint8_t * addr, uint16_t port)
{  
   uint32_t taddr;
   CHECK_SOCKNUM();
   CHECK_SOCKMODE(Sn_MR_TCP);
   CHECK_SOCKINIT();
   //M20140501 : For avoiding fatal error on memory align mismatched
    
   taddr = ((uint32_t)addr[0] & 0x000000FF);
   taddr = (taddr << 8) + ((uint32_t)addr[1] & 0x000000FF);
   taddr = (taddr << 8) + ((uint32_t)addr[2] & 0x000000FF);
   taddr = (taddr << 8) + ((uint32_t)addr[3] & 0x000000FF);
   if( taddr == 0xFFFFFFFF || taddr == 0) return SOCKERR_IPINVALID;
     
  if(port == 0) return SOCKERR_PORTZERO;
  setSn_DIPR(sn,addr);
  setSn_DPORT(sn,port);
  setSn_CR(sn,Sn_CR_CONNECT);
   while(getSn_CR(sn));
   if(sock_io_mode & (1<<sn)) return SOCK_BUSY;
   while(getSn_SR(sn) != SOCK_ESTABLISHED)
   {
    if (getSn_IR(sn) & Sn_IR_TIMEOUT)
    {
      setSn_IR(sn, Sn_IR_TIMEOUT);
            return SOCKERR_TIMEOUT;
    }

    if (getSn_SR(sn) == SOCK_CLOSED)
    {
      return SOCKERR_SOCKCLOSED;
    }
  }
   
   return SOCK_OK;
}

int8_t disconnect(uint8_t sn)
{
   CHECK_SOCKNUM();
   CHECK_SOCKMODE(Sn_MR_TCP);
  setSn_CR(sn,Sn_CR_DISCON);
  /* wait to process the command... */
  while(getSn_CR(sn));
  sock_is_sending &= ~(1<<sn);
   if(sock_io_mode & (1<<sn)) return SOCK_BUSY;
  while(getSn_SR(sn) != SOCK_CLOSED)
  {
     if(getSn_IR(sn) & Sn_IR_TIMEOUT)
     {
        close(sn);
        return SOCKERR_TIMEOUT;
     }
  }
  return SOCK_OK;
}

int32_t send(uint8_t sn, uint8_t * buf, uint16_t len)
{
   uint8_t tmp=0;
   uint16_t freesize=0;
   
   CHECK_SOCKNUM();
   CHECK_SOCKMODE(Sn_MR_TCP);
   CHECK_SOCKDATA();
   tmp = getSn_SR(sn);
   if(tmp != SOCK_ESTABLISHED && tmp != SOCK_CLOSE_WAIT)
     return SOCKERR_SOCKSTATUS;
   if( sock_is_sending & (1<<sn) )
   {
      tmp = getSn_IR(sn);
      if(tmp & Sn_IR_SENDOK)
      {
         setSn_IR(sn, Sn_IR_SENDOK);   // SENDOK--发送完成  清除标志
               
         sock_is_sending &= ~(1<<sn);   // 清除标志       
      }
      else if(tmp & Sn_IR_TIMEOUT)      // 超时
      {
         close(sn);
         return SOCKERR_TIMEOUT;
      }
      else return SOCK_BUSY;    // 忙
   }
   freesize = getSn_TxMAX(sn);  // 获取 发送缓存大小
   if (len > freesize) len = freesize; // check size not to exceed MAX size.
   while(1)
   {
      freesize = getSn_TX_FSR(sn);   // 获取发送缓存空闲大小
      tmp = getSn_SR(sn);
      if ((tmp != SOCK_ESTABLISHED) && (tmp != SOCK_CLOSE_WAIT))
      {
         close(sn);
         return SOCKERR_SOCKSTATUS;
      }
      if( (sock_io_mode & (1<<sn)) && (len > freesize) ) return SOCK_BUSY;
      if(len <= freesize) break;
   }
   wiz_send_data(sn, buf, len);
   
   setSn_CR(sn,Sn_CR_SEND);
   /* wait to process the command... */
   while(getSn_CR(sn));

   sock_is_sending |= (1 << sn);
   //M20150409 : Explicit Type Casting
   return (int32_t)len;
}


int32_t recv(uint8_t sn, uint8_t * buf, uint16_t len)
{
   uint8_t  tmp = 0;
   uint16_t recvsize = 0;

   CHECK_SOCKNUM();
   CHECK_SOCKMODE(Sn_MR_TCP);
   CHECK_SOCKDATA();
   
   recvsize = getSn_RxMAX(sn);   // 得到接收缓存大小 1024 2048 4096 8192
   if(recvsize < len) len = recvsize;   // 发送的数据不能超过RXMAX
      
   while(1)
   {
     recvsize = getSn_RX_RSR(sn);  // 读取接收数据大小
     tmp = getSn_SR(sn);
     if (tmp != SOCK_ESTABLISHED)
     {
        if(tmp == SOCK_CLOSE_WAIT)
        {
           if(recvsize != 0) break;
           else if(getSn_TX_FSR(sn) == getSn_TxMAX(sn))  //Sn_TX_FSR--发送缓存空闲大小
           {
              close(sn);
              return SOCKERR_SOCKSTATUS;
           }
        }
        else
        {
           close(sn);
           return SOCKERR_SOCKSTATUS;
        }
     }
     if((sock_io_mode & (1<<sn)) && (recvsize == 0)) return SOCK_BUSY;
     if(recvsize != 0) break;
   };
  
   if(recvsize < len) len = recvsize;   
   wiz_recv_data(sn, buf, len);
   setSn_CR(sn,Sn_CR_RECV);       // 更新接收读指针寄存器
   while(getSn_CR(sn));     
   //M20150409 : Explicit Type Casting
   return (int32_t)len;
}
int32_t sendto(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port)
{
   uint8_t tmp = 0;
   uint16_t freesize = 0;
   uint32_t taddr;

   CHECK_SOCKNUM();
   switch(getSn_MR(sn) & 0x0F)
   {
      case Sn_MR_UDP:
      case Sn_MR_MACRAW:
    case Sn_MR_IPRAW:
         break;
      default:
         return SOCKERR_SOCKMODE;
   }
   CHECK_SOCKDATA();
   //M20140501 : For avoiding fatal error on memory align mismatched
   taddr = ((uint32_t)addr[0]) & 0x000000FF;
   taddr = (taddr << 8) + ((uint32_t)addr[1] & 0x000000FF);
   taddr = (taddr << 8) + ((uint32_t)addr[2] & 0x000000FF);
   taddr = (taddr << 8) + ((uint32_t)addr[3] & 0x000000FF);

   if(taddr == 0)         return SOCKERR_IPINVALID;
   if(port == 0)          return SOCKERR_PORTZERO;
   tmp = getSn_SR(sn);
   if(tmp != SOCK_MACRAW && tmp != SOCK_UDP && tmp != SOCK_IPRAW) return SOCKERR_SOCKSTATUS;
      
   setSn_DIPR(sn,addr);
   setSn_DPORT(sn,port);      
   freesize = getSn_TxMAX(sn);
   if (len > freesize) len = freesize; // check size not to exceed MAX size.
   while(1)
   {
      freesize = getSn_TX_FSR(sn);
      if(getSn_SR(sn) == SOCK_CLOSED) return SOCKERR_SOCKCLOSED;
      if( (sock_io_mode & (1<<sn)) && (len > freesize) ) return SOCK_BUSY;
      if(len <= freesize) break;
   };
   wiz_send_data(sn, buf, len);

   getSIPR((uint8_t*)&taddr);
   if(taddr == 0)
   {
      getSUBR((uint8_t*)&taddr);
      setSUBR((uint8_t*)"\x00\x00\x00\x00");
   }
   else taddr = 0;
   
  setSn_CR(sn,Sn_CR_SEND);
  /* wait to process the command... */
  while(getSn_CR(sn));
   while(1)
   {
      tmp = getSn_IR(sn);
      if(tmp & Sn_IR_SENDOK)
      {
         setSn_IR(sn, Sn_IR_SENDOK);
         break;
      }
      //M:20131104    
      else if(tmp & Sn_IR_TIMEOUT)
      {
         setSn_IR(sn, Sn_IR_TIMEOUT);
         //M20150409 : Fixed the lost of sign bits by type casting.
         if(taddr) setSUBR((uint8_t*)&taddr);
        
         return SOCKERR_TIMEOUT;
      }
 
   }
      if(taddr) setSUBR((uint8_t*)&taddr); 
   //M20150409 : Explicit Type Casting
   return (int32_t)len;
}



int32_t recvfrom(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port)
{

  uint8_t  mr;   
  uint8_t  head[8];
  uint16_t pack_len=0;

   CHECK_SOCKNUM();
    
   switch((mr=getSn_MR(sn)) & 0x0F)
   {
      case Sn_MR_UDP:
      case Sn_MR_MACRAW:
         break;
      case Sn_MR_IPRAW:
      case Sn_MR_PPPoE:
         break;
      default:
         return SOCKERR_SOCKMODE;
   }
   CHECK_SOCKDATA();
   if(sock_remained_size[sn] == 0)
   {
      while(1)
      {
         pack_len = getSn_RX_RSR(sn);
         if(getSn_SR(sn) == SOCK_CLOSED) return SOCKERR_SOCKCLOSED;
         if( (sock_io_mode & (1<<sn)) && (pack_len == 0) ) return SOCK_BUSY;
         if(pack_len != 0) break;
      };
   }
//D20150601 : Move it to bottom
// sock_pack_info[sn] = PACK_COMPLETED;
  switch (mr & 0x07)
  {
     case Sn_MR_UDP :
        if(sock_remained_size[sn] == 0)
        {
         wiz_recv_data(sn, head, 8);
         setSn_CR(sn,Sn_CR_RECV);
         while(getSn_CR(sn));
        // read peer's IP address, port number & packet length

  
        addr[0] = head[0];
        addr[1] = head[1];
        addr[2] = head[2];
        addr[3] = head[3];
        *port = head[4];
        *port = (*port << 8) + head[5];
        sock_remained_size[sn] = head[6];
        sock_remained_size[sn] = (sock_remained_size[sn] << 8) + head[7];
     
         sock_pack_info[sn] = PACK_FIRST;
        }
      if(len < sock_remained_size[sn]) pack_len = len;
      else pack_len = sock_remained_size[sn];
      //A20150601 : For W5300
      len = pack_len;
      // Need to packet length check (default 1472)    
       wiz_recv_data(sn, buf, pack_len); // data copy.
      break;
     case Sn_MR_MACRAW :
        if(sock_remained_size[sn] == 0)
        {
         wiz_recv_data(sn, head, 2);
         setSn_CR(sn,Sn_CR_RECV);
         while(getSn_CR(sn));
         // read peer's IP address, port number & packet length
          sock_remained_size[sn] = head[0];
         sock_remained_size[sn] = (sock_remained_size[sn] <<8) + head[1];
         if(sock_remained_size[sn] > 1514) 
         {
            close(sn);
            return SOCKFATAL_PACKLEN;
         }
         sock_pack_info[sn] = PACK_FIRST;
        }
      if(len < sock_remained_size[sn]) pack_len = len;
      else pack_len = sock_remained_size[sn];
      wiz_recv_data(sn,buf,pack_len);
       break;
   
    case Sn_MR_IPRAW:
       if(sock_remained_size[sn] == 0)
       {
         wiz_recv_data(sn, head, 6);
         setSn_CR(sn,Sn_CR_RECV);
         while(getSn_CR(sn));
         addr[0] = head[0];
         addr[1] = head[1];
         addr[2] = head[2];
         addr[3] = head[3];
         sock_remained_size[sn] = head[4];
         //M20150401 : For Typing Error
         sock_remained_size[sn] = (sock_remained_size[sn] << 8) + head[5];
         sock_pack_info[sn] = PACK_FIRST;
         }
      //
      // Need to packet length check
      //
      if(len < sock_remained_size[sn]) pack_len = len;
      else pack_len = sock_remained_size[sn];
       wiz_recv_data(sn, buf, pack_len); // data copy.
      break;

      default:
         wiz_recv_ignore(sn, pack_len); // data copy.
         sock_remained_size[sn] = pack_len;
         break;
   }
  setSn_CR(sn,Sn_CR_RECV);
  /* wait to process the command... */
  while(getSn_CR(sn)) ;
  sock_remained_size[sn] -= pack_len;
  //M20150601 : 
  if(sock_remained_size[sn] != 0)
  {
     sock_pack_info[sn] |= PACK_REMAINED;      
  }
  else sock_pack_info[sn] = PACK_COMPLETED;
   //M20150409 : Explicit Type Casting
   return (int32_t)pack_len;
}


int8_t  ctlsocket(uint8_t sn, ctlsock_type cstype, void* arg)
{
   uint8_t tmp = 0;
   CHECK_SOCKNUM();
   switch(cstype)
   {
      case CS_SET_IOMODE:
         tmp = *((uint8_t*)arg);
         if(tmp == SOCK_IO_NONBLOCK)  sock_io_mode |= (1<<sn);
         else if(tmp == SOCK_IO_BLOCK) sock_io_mode &= ~(1<<sn);
         else return SOCKERR_ARG;
         break;
      case CS_GET_IOMODE:   
         //M20140501 : implict type casting -> explict type casting   
         *((uint8_t*)arg) = (uint8_t)((sock_io_mode >> sn) & 0x0001);
         break;
      case CS_GET_MAXTXBUF:
         *((uint16_t*)arg) = getSn_TxMAX(sn);
         break;
      case CS_GET_MAXRXBUF:    
         *((uint16_t*)arg) = getSn_RxMAX(sn);
         break;
      case CS_CLR_INTERRUPT:
         if( (*(uint8_t*)arg) > SIK_ALL) return SOCKERR_ARG;
         setSn_IR(sn,*(uint8_t*)arg);
         break;
      case CS_GET_INTERRUPT:
         *((uint8_t*)arg) = getSn_IR(sn);
         break;
      default:
         return SOCKERR_ARG;
   }
   return SOCK_OK;
}

int8_t  setsockopt(uint8_t sn, sockopt_type sotype, void* arg)
{
 // M20131220 : Remove warning
   CHECK_SOCKNUM();
   switch(sotype)
   {
      case SO_TTL:
         setSn_TTL(sn,*(uint8_t*)arg);
         break;
      case SO_TOS:
         setSn_TOS(sn,*(uint8_t*)arg);
         break;
      case SO_MSS:
         setSn_MSSR(sn,*(uint16_t*)arg);
         break;
      case SO_DESTIP:
         setSn_DIPR(sn, (uint8_t*)arg);
         break;
      case SO_DESTPORT:
         setSn_DPORT(sn, *(uint16_t*)arg);
         break;  
      default:
         return SOCKERR_ARG;
   }   
   return SOCK_OK;
}

int8_t  getsockopt(uint8_t sn, sockopt_type sotype, void* arg)
{
   CHECK_SOCKNUM();
   switch(sotype)
   {
      case SO_FLAG:
         *(uint8_t*)arg = getSn_MR(sn) & 0xF0;
         break;
      case SO_TTL:
         *(uint8_t*) arg = getSn_TTL(sn);
         break;
      case SO_TOS:
         *(uint8_t*) arg = getSn_TOS(sn);
         break;
      case SO_MSS:   
         *(uint8_t*) arg = getSn_MSSR(sn);
         break;
      case SO_DESTIP:
         getSn_DIPR(sn, (uint8_t*)arg);
         break;
      case SO_DESTPORT:  
         *(uint16_t*) arg = getSn_DPORT(sn);
         break;
    
      case SO_SENDBUF:
         *(uint16_t*) arg = getSn_TX_FSR(sn);
         break;
      case SO_RECVBUF:
         *(uint16_t*) arg = getSn_RX_RSR(sn);
         break;
      case SO_STATUS:
         *(uint8_t*) arg = getSn_SR(sn);
         break;
      case SO_REMAINSIZE:
         if(getSn_MR(sn) == Sn_MR_TCP)
            *(uint16_t*)arg = getSn_RX_RSR(sn);
         else
            *(uint16_t*)arg = sock_remained_size[sn];
         break;
      case SO_PACKINFO:
         CHECK_SOCKMODE(Sn_MR_TCP);
         *(uint8_t*)arg = sock_pack_info[sn];
         break;
      default:
         return SOCKERR_SOCKOPT;
   }
   return SOCK_OK;
}