stream/stream_file.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26
  27 #include "mp_msg.h"
  28 #include "stream.h"
  29 #include "m_option.h"
  30 #include "m_struct.h"
  31
  32 static struct stream_priv_s {
  33   char* filename;
  34   char *filename2;
  35 } stream_priv_dflts = {
  36   NULL, NULL
  37 };
  38
  39 #define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
  40 /// URL definition
  41 static const m_option_t stream_opts_fields[] = {
  42   {"string", ST_OFF(filename), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  43   {"filename", ST_OFF(filename2), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  44   { NULL, NULL, 0, 0, 0, 0,  NULL }
  45 };
  46 static const struct m_struct_st stream_opts = {
  47   "file",
  48   sizeof(struct stream_priv_s),
  49   &stream_priv_dflts,
  50   stream_opts_fields
  51 };
  52
  53 static int fill_buffer(stream_t *s, char* buffer, int max_len){
  54   int r = read(s->fd,buffer,max_len);
  55   return (r <= 0) ? -1 : r;
  56 }
  57
  58 static int write_buffer(stream_t *s, char* buffer, int len) {
  59   int r = write(s->fd,buffer,len);
  60   return (r <= 0) ? -1 : r;
  61 }
  62
  63 static int seek(stream_t *s,off_t newpos) {
  64   s->pos = newpos;
  65   if(lseek(s->fd,s->pos,SEEK_SET)<0) {
  66     s->eof=1;
  67     return 0;
  68   }
  69   return 1;
  70 }
  71
  72 static int seek_forward(stream_t *s,off_t newpos) {
  73   if(newpos<s->pos){
  74     mp_msg(MSGT_STREAM,MSGL_INFO,"Cannot seek backward in linear streams!\n");
  75     return 0;
  76   }
  77   while(s->pos<newpos){
  78     int len=s->fill_buffer(s,s->buffer,STREAM_BUFFER_SIZE);
  79     if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; break; } // EOF
  80     s->buf_pos=0;
  81     s->buf_len=len;
  82     s->pos+=len;
  83   }
  84   return 1;
  85 }
  86
  87 static int control(stream_t *s, int cmd, void *arg) {
  88   switch(cmd) {
  89     case STREAM_CTRL_GET_SIZE: {
  90       off_t size;
  91
  92       size = lseek(s->fd, 0, SEEK_END);
  93       lseek(s->fd, s->pos, SEEK_SET);
  94       if(size != (off_t)-1) {
  95         *((off_t*)arg) = size;
  96         return 1;
  97       }
  98     }
  99   }
 100   return STREAM_UNSUPPORTED;
 101 }
 102
 103 static int open_f(stream_t *stream,int mode, void* opts, int* file_format) {
 104   int f;
 105   mode_t m = 0;
 106   off_t len;
 107   unsigned char *filename;
 108   struct stream_priv_s* p = (struct stream_priv_s*)opts;
 109
 110   if(mode == STREAM_READ)
 111     m = O_RDONLY;
 112   else if(mode == STREAM_WRITE)
 113     m = O_RDWR|O_CREAT|O_TRUNC;
 114   else {
 115     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] Unknown open mode %d\n",mode);
 116     m_struct_free(&stream_opts,opts);
 117     return STREAM_UNSUPPORTED;
 118   }
 119
 120   if(p->filename)
 121     filename = p->filename;
 122   else if(p->filename2)
 123     filename = p->filename2;
 124   else
 125     filename = NULL;
 126   if(!filename) {
 127     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] No filename\n");
 128     m_struct_free(&stream_opts,opts);
 129     return STREAM_ERROR;
 130   }
 131
 132 #if HAVE_DOS_PATHS
 133   // extract '/' from '/x:/path'
 134   if( filename[ 0 ] == '/' && filename[ 1 ] && filename[ 2 ] == ':' )
 135     filename++;
 136 #endif
 137
 138   m |= O_BINARY;
 139
 140   if(!strcmp(filename,"-")){
 141     if(mode == STREAM_READ) {
 142       // read from stdin
 143       mp_tmsg(MSGT_OPEN,MSGL_INFO,"Reading from stdin...\n");
 144       f=0; // 0=stdin
 145 #if HAVE_SETMODE
 146       setmode(fileno(stdin),O_BINARY);
 147 #endif
 148     } else {
 149       mp_msg(MSGT_OPEN,MSGL_INFO,"Writing to stdout\n");
 150       f=1;
 151 #if HAVE_SETMODE
 152       setmode(fileno(stdout),O_BINARY);
 153 #endif
 154     }
 155   } else {
 156       mode_t openmode = S_IRUSR|S_IWUSR;
 157 #ifndef __MINGW32__
 158       openmode |= S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 159 #endif
 160       f=open(filename,m, openmode);
 161     if(f<0) {
 162       mp_tmsg(MSGT_OPEN,MSGL_ERR,"File not found: '%s'\n",filename);
 163       m_struct_free(&stream_opts,opts);
 164       return STREAM_ERROR;
 165     }
 166   }
 167
 168   len=lseek(f,0,SEEK_END); lseek(f,0,SEEK_SET);
 169 #ifdef __MINGW32__
 170   // seeks on stdin incorrectly succeed on MinGW
 171   if(f==0)
 172     len = -1;
 173 #endif
 174   if(len == -1) {
 175     if(mode == STREAM_READ) stream->seek = seek_forward;
 176     stream->type = STREAMTYPE_STREAM; // Must be move to STREAMTYPE_FILE
 177     stream->flags |= MP_STREAM_SEEK_FW;
 178   } else if(len >= 0) {
 179     stream->seek = seek;
 180     stream->end_pos = len;
 181     stream->type = STREAMTYPE_FILE;
 182   }
 183
 184   mp_msg(MSGT_OPEN,MSGL_V,"[file] File size is %"PRId64" bytes\n", (int64_t)len);
 185
 186   stream->fd = f;
 187   stream->fill_buffer = fill_buffer;
 188   stream->write_buffer = write_buffer;
 189   stream->control = control;
 190
 191   m_struct_free(&stream_opts,opts);
 192   return STREAM_OK;
 193 }
 194
 195 const stream_info_t stream_info_file = {
 196   "File",
 197   "file",
 198   "Albeu",
 199   "based on the code from ??? (probably Arpi)",
 200   open_f,
 201   { "file", "", NULL },
 202   &stream_opts,
 203   1 // Urls are an option string
 204 };