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 "osdep/io.h"
  28
  29 #include "mp_msg.h"
  30 #include "stream.h"
  31 #include "m_option.h"
  32 #include "m_struct.h"
  33
  34 static struct stream_priv_s {
  35   char* filename;
  36   char *filename2;
  37 } stream_priv_dflts = {
  38   NULL, NULL
  39 };
  40
  41 #define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
  42 /// URL definition
  43 static const m_option_t stream_opts_fields[] = {
  44   {"string", ST_OFF(filename), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  45   {"filename", ST_OFF(filename2), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  46   { NULL, NULL, 0, 0, 0, 0,  NULL }
  47 };
  48 static const struct m_struct_st stream_opts = {
  49   "file",
  50   sizeof(struct stream_priv_s),
  51   &stream_priv_dflts,
  52   stream_opts_fields
  53 };
  54
  55 static int fill_buffer(stream_t *s, char* buffer, int max_len){
  56   int r = read(s->fd,buffer,max_len);
  57   return (r <= 0) ? -1 : r;
  58 }
  59
  60 static int write_buffer(stream_t *s, char* buffer, int len) {
  61   int r;
  62   int wr = 0;
  63   while (wr < len) {
  64     r = write(s->fd,buffer,len);
  65     if (r <= 0)
  66       return -1;
  67     wr += r;
  68     buffer += r;
  69   }
  70   return len;
  71 }
  72
  73 static int seek(stream_t *s,off_t newpos) {
  74   s->pos = newpos;
  75   if(lseek(s->fd,s->pos,SEEK_SET)<0) {
  76     s->eof=1;
  77     return 0;
  78   }
  79   return 1;
  80 }
  81
  82 static int seek_forward(stream_t *s,off_t newpos) {
  83   if(newpos<s->pos){
  84     mp_msg(MSGT_STREAM,MSGL_INFO,"Cannot seek backward in linear streams!\n");
  85     return 0;
  86   }
  87   while(s->pos<newpos){
  88     int len=s->fill_buffer(s,s->buffer,STREAM_BUFFER_SIZE);
  89     if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; break; } // EOF
  90     s->buf_pos=0;
  91     s->buf_len=len;
  92     s->pos+=len;
  93   }
  94   return 1;
  95 }
  96
  97 static int control(stream_t *s, int cmd, void *arg) {
  98   switch(cmd) {
  99     case STREAM_CTRL_GET_SIZE: {
 100       off_t size;
 101
 102       size = lseek(s->fd, 0, SEEK_END);
 103       lseek(s->fd, s->pos, SEEK_SET);
 104       if(size != (off_t)-1) {
 105         *((off_t*)arg) = size;
 106         return 1;
 107       }
 108     }
 109   }
 110   return STREAM_UNSUPPORTED;
 111 }
 112
 113 static int open_f(stream_t *stream,int mode, void* opts, int* file_format) {
 114   int f;
 115   mode_t m = 0;
 116   off_t len;
 117   unsigned char *filename;
 118   struct stream_priv_s* p = (struct stream_priv_s*)opts;
 119
 120   if(mode == STREAM_READ)
 121     m = O_RDONLY;
 122   else if(mode == STREAM_WRITE)
 123     m = O_RDWR|O_CREAT|O_TRUNC;
 124   else {
 125     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] Unknown open mode %d\n",mode);
 126     m_struct_free(&stream_opts,opts);
 127     return STREAM_UNSUPPORTED;
 128   }
 129
 130   if(p->filename)
 131     filename = p->filename;
 132   else if(p->filename2)
 133     filename = p->filename2;
 134   else
 135     filename = NULL;
 136   if(!filename) {
 137     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] No filename\n");
 138     m_struct_free(&stream_opts,opts);
 139     return STREAM_ERROR;
 140   }
 141
 142 #if HAVE_DOS_PATHS
 143   // extract '/' from '/x:/path'
 144   if( filename[ 0 ] == '/' && filename[ 1 ] && filename[ 2 ] == ':' )
 145     filename++;
 146 #endif
 147
 148   m |= O_BINARY;
 149
 150   if(!strcmp(filename,"-")){
 151     if(mode == STREAM_READ) {
 152       // read from stdin
 153       mp_tmsg(MSGT_OPEN,MSGL_INFO,"Reading from stdin...\n");
 154       f=0; // 0=stdin
 155 #if HAVE_SETMODE
 156       setmode(fileno(stdin),O_BINARY);
 157 #endif
 158     } else {
 159       mp_msg(MSGT_OPEN,MSGL_INFO,"Writing to stdout\n");
 160       f=1;
 161 #if HAVE_SETMODE
 162       setmode(fileno(stdout),O_BINARY);
 163 #endif
 164     }
 165   } else {
 166       mode_t openmode = S_IRUSR|S_IWUSR;
 167 #ifndef __MINGW32__
 168       openmode |= S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
 169 #endif
 170       f=open(filename,m, openmode);
 171     if(f<0) {
 172       mp_tmsg(MSGT_OPEN,MSGL_ERR,"File not found: '%s'\n",filename);
 173       m_struct_free(&stream_opts,opts);
 174       return STREAM_ERROR;
 175     }
 176   }
 177
 178   len=lseek(f,0,SEEK_END); lseek(f,0,SEEK_SET);
 179 #ifdef __MINGW32__
 180   // seeks on stdin incorrectly succeed on MinGW
 181   if(f==0)
 182     len = -1;
 183 #endif
 184   if(len == -1) {
 185     if(mode == STREAM_READ) stream->seek = seek_forward;
 186     stream->type = STREAMTYPE_STREAM; // Must be move to STREAMTYPE_FILE
 187     stream->flags |= MP_STREAM_SEEK_FW;
 188   } else if(len >= 0) {
 189     stream->seek = seek;
 190     stream->end_pos = len;
 191     stream->type = STREAMTYPE_FILE;
 192   }
 193
 194   mp_msg(MSGT_OPEN,MSGL_V,"[file] File size is %"PRId64" bytes\n", (int64_t)len);
 195
 196   stream->fd = f;
 197   stream->fill_buffer = fill_buffer;
 198   stream->write_buffer = write_buffer;
 199   stream->control = control;
 200   stream->read_chunk = 64*1024;
 201
 202   m_struct_free(&stream_opts,opts);
 203   return STREAM_OK;
 204 }
 205
 206 const stream_info_t stream_info_file = {
 207   "File",
 208   "file",
 209   "Albeu",
 210   "based on the code from ??? (probably Arpi)",
 211   open_f,
 212   { "file", "", NULL },
 213   &stream_opts,
 214   1 // Urls are an option string
 215 };