summaryrefslogtreecommitdiffstats
path: root/stream/stream_file.c
blob: 9b21d80d04eed023175193eba15895c2da289124 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189

#include "config.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "mp_msg.h"
#include "stream.h"
#include "help_mp.h"
#include "m_option.h"
#include "m_struct.h"

static struct stream_priv_s {
  char* filename;
  char *filename2;
} stream_priv_dflts = {
  NULL, NULL
};

#define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
/// URL definition
static const m_option_t stream_opts_fields[] = {
  {"string", ST_OFF(filename), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  {"filename", ST_OFF(filename2), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  { NULL, NULL, 0, 0, 0, 0,  NULL }
};
static const struct m_struct_st stream_opts = {
  "file",
  sizeof(struct stream_priv_s),
  &stream_priv_dflts,
  stream_opts_fields
};  

static int fill_buffer(stream_t *s, char* buffer, int max_len){
  int r = read(s->fd,buffer,max_len);
  return (r <= 0) ? -1 : r;
}

static int write_buffer(stream_t *s, char* buffer, int len) {
  int r = write(s->fd,buffer,len);
  return (r <= 0) ? -1 : r;
}

static int seek(stream_t *s,off_t newpos) {
  s->pos = newpos;
  if(lseek(s->fd,s->pos,SEEK_SET)<0) {
    s->eof=1;
    return 0;
  }
  return 1;
}

static int seek_forward(stream_t *s,off_t newpos) {
  if(newpos<s->pos){
    mp_msg(MSGT_STREAM,MSGL_INFO,"Cannot seek backward in linear streams!\n");
    return 0;
  }
  while(s->pos<newpos){
    int len=s->fill_buffer(s,s->buffer,STREAM_BUFFER_SIZE);
    if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; break; } // EOF
    s->buf_pos=0;
    s->buf_len=len;
    s->pos+=len;
  }
  return 1;
}

static int control(stream_t *s, int cmd, void *arg) {
  switch(cmd) {
    case STREAM_CTRL_GET_SIZE: {
      off_t size;

      size = lseek(s->fd, 0, SEEK_END);
      lseek(s->fd, s->pos, SEEK_SET);
      if(size != (off_t)-1) {
        *((off_t*)arg) = size;
        return 1;
      }
    }
  }
  return STREAM_UNSUPPORTED;
}

static int open_f(stream_t *stream,int mode, void* opts, int* file_format) {
  int f;
  mode_t m = 0;
  off_t len;
  unsigned char *filename;
  struct stream_priv_s* p = (struct stream_priv_s*)opts;

  if(mode == STREAM_READ)
    m = O_RDONLY;
  else if(mode == STREAM_WRITE)
    m = O_RDWR|O_CREAT|O_TRUNC;
  else {
    mp_msg(MSGT_OPEN,MSGL_ERR, "[file] Unknown open mode %d\n",mode);
    m_struct_free(&stream_opts,opts);
    return STREAM_UNSUPPORTED;
  }

  if(p->filename)
    filename = p->filename;
  else if(p->filename2)
    filename = p->filename2;
  else
    filename = NULL;
  if(!filename) {
    mp_msg(MSGT_OPEN,MSGL_ERR, "[file] No filename\n");
    m_struct_free(&stream_opts,opts);
    return STREAM_ERROR;
  }

#if defined(WIN32) || defined(__OS2__)
  // extract '/' from '/x:/path'
  if( filename[ 0 ] == '/' && filename[ 1 ] && filename[ 2 ] == ':' )
    filename++;
#endif

#if defined(__CYGWIN__)|| defined(__MINGW32__)
  m |= O_BINARY;
#endif    

  if(!strcmp(filename,"-")){
    if(mode == STREAM_READ) {
      // read from stdin
      mp_msg(MSGT_OPEN,MSGL_INFO,MSGTR_ReadSTDIN);
      f=0; // 0=stdin
#ifdef __MINGW32__
	  setmode(fileno(stdin),O_BINARY);
#endif
    } else {
      mp_msg(MSGT_OPEN,MSGL_INFO,"Writing to stdout\n");
      f=1;
#ifdef __MINGW32__
	  setmode(fileno(stdout),O_BINARY);
#endif
    }
  } else {
      mode_t openmode = S_IRUSR|S_IWUSR;
#ifndef __MINGW32__
      openmode |= S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
#endif
      f=open(filename,m, openmode);
    if(f<0) {
      mp_msg(MSGT_OPEN,MSGL_ERR,MSGTR_FileNotFound,filename);
      m_struct_free(&stream_opts,opts);
      return STREAM_ERROR;
    }
  }

  len=lseek(f,0,SEEK_END); lseek(f,0,SEEK_SET);
#ifdef __MINGW32__
  if(f==0 || len == -1) {
#else
  if(len == -1) {
#endif
    if(mode == STREAM_READ) stream->seek = seek_forward;
    stream->type = STREAMTYPE_STREAM; // Must be move to STREAMTYPE_FILE
    stream->flags |= STREAM_SEEK_FW;
  } else if(len >= 0) {
    stream->seek = seek;
    stream->end_pos = len;
    stream->type = STREAMTYPE_FILE;
  }

  mp_msg(MSGT_OPEN,MSGL_V,"[file] File size is %"PRId64" bytes\n", (int64_t)len);

  stream->fd = f;
  stream->fill_buffer = fill_buffer;
  stream->write_buffer = write_buffer;
  stream->control = control;

  m_struct_free(&stream_opts,opts);
  return STREAM_OK;
}

const stream_info_t stream_info_file = {
  "File",
  "file",
  "Albeu",
  "based on the code from ??? (probably Arpi)",
  open_f,
  { "file", "", NULL },
  &stream_opts,
  1 // Urls are an option string
};