stream/stream_netstream.h

   1
   2 /*
   3  * Common stuff for netstream
   4  * Packets and so on are defined here along with a few helpers
   5  * wich are used by both the client and the server
   6  *
   7  * Data is always low endian
   8  */
   9
  10 #ifndef MPLAYER_NETSTREAM_H
  11 #define MPLAYER_NETSTREAM_H
  12
  13 #include <stdint.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <errno.h>
  17 #if !HAVE_WINSOCK2_H
  18 #include <sys/socket.h>
  19 #endif
  20 #include "mp_msg.h"
  21 #include "mpbswap.h"
  22
  23 typedef struct mp_net_stream_packet_st {
  24   uint16_t len;
  25   uint8_t cmd;
  26   char data[0];
  27 } __attribute__ ((packed))  mp_net_stream_packet_t;
  28
  29 #define PACKET_MAX_SIZE 4096
  30
  31 // Commands sent by the client
  32 #define NET_STREAM_OPEN 0
  33 // data is the url
  34 #define NET_STREAM_FILL_BUFFER 1
  35 // data is an uint16 wich is the max len of the data to return
  36 #define NET_STREAM_SEEK 3
  37 // data is an uint64 wich the pos where to seek
  38 #define NET_STREAM_CLOSE 4
  39 // no data
  40 #define NET_STREAM_RESET 5
  41 // no data
  42
  43 // Server response
  44 #define NET_STREAM_OK 128
  45 // Data returned if open is successful
  46 typedef struct mp_net_stream_opened_st {
  47   uint32_t file_format;
  48   uint32_t flags;
  49   uint32_t sector_size;
  50   uint64_t start_pos;
  51   uint64_t end_pos;
  52 }  __attribute__ ((packed))  mp_net_stream_opened_t;
  53 // FILL_BUFFER return the data
  54 // CLOSE return nothing
  55 #define NET_STREAM_ERROR 129
  56 // Data is the error message (if any ;)
  57
  58 static int net_read(int fd, char* buf, int len) {
  59   int r = 0;
  60   while(len) {
  61     r = recv(fd,buf,len,0);
  62     if(r <= 0) {
  63       if(errno == EINTR) continue;
  64       if(r < 0)
  65         mp_msg(MSGT_NETST,MSGL_ERR,"Read failed: %s\n",strerror(errno));
  66       return 0;
  67     }
  68     len -= r;
  69     buf += r;
  70   }
  71   return 1;
  72 }
  73
  74 static mp_net_stream_packet_t* read_packet(int fd) {
  75   uint16_t len;
  76   mp_net_stream_packet_t* pack =
  77     (mp_net_stream_packet_t*)malloc(sizeof(mp_net_stream_packet_t));
  78
  79   if(!net_read(fd,(char*)pack,sizeof(mp_net_stream_packet_t))) {
  80     free(pack);
  81     return NULL;
  82   }
  83   pack->len = le2me_16(pack->len);
  84
  85   if(pack->len < sizeof(mp_net_stream_packet_t)) {
  86     mp_msg(MSGT_NETST,MSGL_WARN,"Got invalid packet (too small: %d)\n",pack->len);
  87     free(pack);
  88     return NULL;
  89   }
  90   if(pack->len > PACKET_MAX_SIZE) {
  91     mp_msg(MSGT_NETST,MSGL_WARN,"Got invalid packet (too big: %d)\n",pack->len);
  92     free(pack);
  93     return NULL;
  94   }
  95   len = pack->len;
  96   if(len > sizeof(mp_net_stream_packet_t)) {
  97     pack = realloc(pack,len);
  98     if(!pack) {
  99       mp_msg(MSGT_NETST,MSGL_ERR,"Failed to get memory for the packet (%d bytes)\n",len);
 100       return NULL;
 101     }
 102     if(!net_read(fd,pack->data,len - sizeof(mp_net_stream_packet_t)))
 103       return NULL;
 104   }
 105   //  printf ("Read packet %d %d %d\n",fd,pack->cmd,pack->len);
 106   return pack;
 107 }
 108
 109 static int net_write(int fd, char* buf, int len) {
 110   int w;
 111   while(len) {
 112     w = send(fd,buf,len,0);
 113     if(w <= 0) {
 114       if(errno == EINTR) continue;
 115       if(w < 0)
 116         mp_msg(MSGT_NETST,MSGL_ERR,"Write failed: %s\n",strerror(errno));
 117       return 0;
 118     }
 119     len -= w;
 120     buf += w;
 121   }
 122   return 1;
 123 }
 124
 125 static int write_packet(int fd, uint8_t cmd,char* data,int len) {
 126   mp_net_stream_packet_t* pack = malloc(len + sizeof(mp_net_stream_packet_t));
 127
 128   if(len > 0 && data)
 129     memcpy(pack->data,data,len);
 130   pack->len = len + sizeof(mp_net_stream_packet_t);
 131   pack->cmd = cmd;
 132
 133   //  printf("Write packet %d %d (%p) %d\n",fd,cmd,data,len);
 134   pack->len = le2me_16(pack->len);
 135   if(net_write(fd,(char*)pack,pack->len)) {
 136     free(pack);
 137     return 1;
 138   }
 139   free(pack);
 140   return 0;
 141 }
 142
 143 static void net_stream_opened_2_me(mp_net_stream_opened_t* o) {
 144   o->file_format = le2me_32(o->file_format);
 145   o->flags = le2me_32(o->flags);
 146   o->sector_size = le2me_32(o->sector_size);
 147   o->start_pos = le2me_64(o->start_pos);
 148   o->end_pos = le2me_64(o->end_pos);
 149 }
 150
 151 #endif /* MPLAYER_NETSTREAM_H */