image.c

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/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Channel Management
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <asterisk/sched.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/channel_pvt.h>
#include <asterisk/logger.h>
#include <asterisk/file.h>
#include <asterisk/image.h>
#include <asterisk/translate.h>
#include <asterisk/cli.h>
#include "asterisk.h"
#include "astconf.h"

static struct ast_imager *list;
AST_MUTEX_DEFINE_STATIC(listlock);

int ast_image_register(struct ast_imager *img)
{
   if (option_verbose > 1)
      ast_verbose(VERBOSE_PREFIX_2 "Registered format '%s' (%s)\n", img->name, img->desc);
   ast_mutex_lock(&listlock);
   img->next = list;
   list = img;
   ast_mutex_unlock(&listlock);
   return 0;
}

void ast_image_unregister(struct ast_imager *img)
{
   struct ast_imager *i, *prev = NULL;
   ast_mutex_lock(&listlock);
   i = list;
   while(i) {
      if (i == img) {
         if (prev) 
            prev->next = i->next;
         else
            list = i->next;
         break;
      }
      prev = i;
      i = i->next;
   }
   ast_mutex_unlock(&listlock);
   if (i && (option_verbose > 1))
      ast_verbose(VERBOSE_PREFIX_2 "Unregistered format '%s' (%s)\n", img->name, img->desc);
}

int ast_supports_images(struct ast_channel *chan)
{
   if (!chan || !chan->pvt)
      return 0;
   if (!chan->pvt->send_image)
      return 0;
   return 1;
}

static int file_exists(char *filename)
{
   int res;
   struct stat st;
   res = stat(filename, &st);
   if (!res)
      return st.st_size;
   return 0;
}

static void make_filename(char *buf, int len, char *filename, char *preflang, char *ext)
{
   if (filename[0] == '/') {
      if (preflang && strlen(preflang))
         snprintf(buf, len, "%s-%s.%s", filename, preflang, ext);
      else
         snprintf(buf, len, "%s.%s", filename, ext);
   } else {
      if (preflang && strlen(preflang))
         snprintf(buf, len, "%s/%s/%s-%s.%s", ast_config_AST_VAR_DIR, "images", filename, preflang, ext);
      else
         snprintf(buf, len, "%s/%s/%s.%s", ast_config_AST_VAR_DIR, "images", filename, ext);
   }
}

struct ast_frame *ast_read_image(char *filename, char *preflang, int format)
{
   struct ast_imager *i;
   char buf[256];
   char tmp[80];
   char *e;
   struct ast_imager *found = NULL;
   int fd;
   int len=0;
   struct ast_frame *f = NULL;
#if 0 /* We need to have some sort of read-only lock */
   ast_mutex_lock(&listlock);
#endif   
   i = list;
   while(!found && i) {
      if (i->format & format) {
         char *stringp=NULL;
         strncpy(tmp, i->exts, sizeof(tmp)-1);
         stringp=tmp;
         e = strsep(&stringp, "|");
         while(e) {
            make_filename(buf, sizeof(buf), filename, preflang, e);
            if ((len = file_exists(buf))) {
               found = i;
               break;
            }
            make_filename(buf, sizeof(buf), filename, NULL, e);
            if ((len = file_exists(buf))) {
               found = i;
               break;
            }
            e = strsep(&stringp, "|");
         }
      }
      i = i->next;
   }
   if (found) {
      fd = open(buf, O_RDONLY);
      if (fd > -1) {
         if (!found->identify || found->identify(fd)) {
            /* Reset file pointer */
            lseek(fd, 0, SEEK_SET);
            f = found->read_image(fd,len); 
         } else
            ast_log(LOG_WARNING, "%s does not appear to be a %s file\n", buf, i->name);
         close(fd);
      } else
         ast_log(LOG_WARNING, "Unable to open '%s': %s\n", buf, strerror(errno));
   } else
      ast_log(LOG_WARNING, "Image file '%s' not found\n", filename);
#if 0
   ast_mutex_unlock(&listlock);
#endif   
   return f;
}


int ast_send_image(struct ast_channel *chan, char *filename)
{
   struct ast_frame *f;
   int res = -1;
   if (chan->pvt->send_image) {
      f = ast_read_image(filename, chan->language, -1);
      if (f) {
         res = chan->pvt->send_image(chan, f);
         ast_frfree(f);
      }
   }
   return res;
}

static int show_image_formats(int fd, int argc, char *argv[])
{
#define FORMAT "%10s %10s %50s %10s\n"
#define FORMAT2 "%10s %10s %50s %10s\n"
   struct ast_imager *i;
   if (argc != 3)
      return RESULT_SHOWUSAGE;
   ast_cli(fd, FORMAT, "Name", "Extensions", "Description", "Format");
   i = list;
   while(i) {
      ast_cli(fd, FORMAT2, i->name, i->exts, i->desc, ast_getformatname(i->format));
      i = i->next;
   };
   return RESULT_SUCCESS;
}

struct ast_cli_entry show_images =
{
   { "show", "image", "formats" },
   show_image_formats,
   "Displays image formats",
"Usage: show image formats\n"
"       displays currently registered image formats (if any)\n"
};


int ast_image_init(void)
{
   ast_cli_register(&show_images);
   return 0;
}

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