image.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Channel Management
   5  *
   6  * Copyright (C) 1999, Mark Spencer
   7  *
   8  * Mark Spencer <markster@linux-support.net>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <pthread.h>
  17 #include <string.h>
  18 #include <sys/time.h>
  19 #include <sys/stat.h>
  20 #include <signal.h>
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <asterisk/sched.h>
  24 #include <asterisk/options.h>
  25 #include <asterisk/channel.h>
  26 #include <asterisk/channel_pvt.h>
  27 #include <asterisk/logger.h>
  28 #include <asterisk/file.h>
  29 #include <asterisk/image.h>
  30 #include <asterisk/translate.h>
  31 #include <asterisk/cli.h>
  32 #include "asterisk.h"
  33
  34 static struct ast_imager *list;
  35 static pthread_mutex_t listlock = PTHREAD_MUTEX_INITIALIZER;
  36
  37 int ast_image_register(struct ast_imager *img)
  38 {
  39         if (option_verbose > 1)
  40                 ast_verbose(VERBOSE_PREFIX_2 "Registered format '%s' (%s)\n", img->name, img->desc);
  41         ast_pthread_mutex_lock(&listlock);
  42         img->next = list;
  43         list = img;
  44         ast_pthread_mutex_unlock(&listlock);
  45         return 0;
  46 }
  47
  48 void ast_image_unregister(struct ast_imager *img)
  49 {
  50         struct ast_imager *i, *prev = NULL;
  51         ast_pthread_mutex_lock(&listlock);
  52         i = list;
  53         while(i) {
  54                 if (i == img) {
  55                         if (prev)
  56                                 prev->next = i->next;
  57                         else
  58                                 list = i->next;
  59                         break;
  60                 }
  61                 prev = i;
  62                 i = i->next;
  63         }
  64         ast_pthread_mutex_unlock(&listlock);
  65         if (i && (option_verbose > 1))
  66                 ast_verbose(VERBOSE_PREFIX_2 "Registered format '%s' (%s)\n", img->name, img->desc);
  67 }
  68
  69 int ast_supports_images(struct ast_channel *chan)
  70 {
  71         if (!chan->pvt->send_image)
  72                 return 0;
  73         return 1;
  74 }
  75
  76 static int file_exists(char *filename)
  77 {
  78         int res;
  79         struct stat st;
  80         res = stat(filename, &st);
  81         if (!res)
  82                 return st.st_size;
  83         return 0;
  84 }
  85
  86 static void make_filename(char *buf, int len, char *filename, char *preflang, char *ext)
  87 {
  88         if (filename[0] == '/') {
  89                 if (preflang && strlen(preflang))
  90                         snprintf(buf, len, "%s-%s.%s", filename, preflang, ext);
  91                 else
  92                         snprintf(buf, len, "%s.%s", filename, ext);
  93         } else {
  94                 if (preflang && strlen(preflang))
  95                         snprintf(buf, len, "%s/%s-%s.%s", AST_IMAGES, filename, preflang, ext);
  96                 else
  97                         snprintf(buf, len, "%s/%s.%s", AST_IMAGES, filename, ext);
  98         }
  99 }
 100
 101 struct ast_frame *ast_read_image(char *filename, char *preflang, int format)
 102 {
 103         struct ast_imager *i;
 104         char buf[256];
 105         char tmp[80];
 106         char *e;
 107         struct ast_imager *found = NULL;
 108         int fd;
 109         int len=0;
 110         struct ast_frame *f = NULL;
 111 #if 0 /* We need to have some sort of read-only lock */
 112         ast_pthread_mutex_lock(&listlock);
 113 #endif
 114         i = list;
 115         while(!found && i) {
 116                 if (i->format & format) {
 117                         strncpy(tmp, i->exts, sizeof(tmp));
 118                         e = strtok(tmp, "|");
 119                         while(e) {
 120                                 make_filename(buf, sizeof(buf), filename, preflang, e);
 121                                 if ((len = file_exists(buf))) {
 122                                         found = i;
 123                                         break;
 124                                 }
 125                                 make_filename(buf, sizeof(buf), filename, NULL, e);
 126                                 if ((len = file_exists(buf))) {
 127                                         found = i;
 128                                         break;
 129                                 }
 130                                 e = strtok(NULL, "|");
 131                         }
 132                 }
 133                 i = i->next;
 134         }
 135         if (found) {
 136                 fd = open(buf, O_RDONLY);
 137                 if (fd > -1) {
 138                         if (!found->identify || found->identify(fd)) {
 139                                 /* Reset file pointer */
 140                                 lseek(fd, 0, SEEK_SET);
 141                                 f = found->read_image(fd,len);
 142                         } else
 143                                 ast_log(LOG_WARNING, "%s does not appear to be a %s file\n", buf, i->name);
 144                         close(fd);
 145                 } else
 146                         ast_log(LOG_WARNING, "Unable to open '%s': %s\n", buf, strerror(errno));
 147         } else
 148                 ast_log(LOG_WARNING, "Image file '%s' not found\n", filename);
 149 #if 0
 150         ast_pthread_mutex_unlock(&listlock);
 151 #endif
 152         return f;
 153 }
 154
 155
 156 int ast_send_image(struct ast_channel *chan, char *filename)
 157 {
 158         struct ast_frame *f;
 159         int res = -1;
 160         if (chan->pvt->send_image) {
 161                 f = ast_read_image(filename, chan->language, -1);
 162                 if (f) {
 163                         res = chan->pvt->send_image(chan, f);
 164                         ast_frfree(f);
 165                 }
 166         }
 167         return res;
 168 }
 169
 170 static int show_image_formats(int fd, int argc, char *argv[])
 171 {
 172 #define FORMAT "%10s %10s %50s %10s\n"
 173 #define FORMAT2 "%10s %10s %50s %10d\n"
 174         struct ast_imager *i;
 175         if (argc != 3)
 176                 return RESULT_SHOWUSAGE;
 177         ast_cli(fd, FORMAT, "Name", "Extensions", "Description", "Format");
 178         i = list;
 179         while(i) {
 180                 ast_cli(fd, FORMAT2, i->name, i->exts, i->desc, i->format);
 181                 i = i->next;
 182         };
 183         return RESULT_SUCCESS;
 184 }
 185
 186 struct ast_cli_entry show_images =
 187 {
 188         { "show", "image", "formats" },
 189         show_image_formats,
 190         "Displays image formats",
 191 "Usage: show image formats\n"
 192 "       displays currently registered image formats (if any)\n"
 193 };
 194
 195
 196 int ast_image_init(void)
 197 {
 198         ast_cli_register(&show_images);
 199         return 0;
 200 }
 201