main/image.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Image Management
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  */
  25
  26 #include "asterisk.h"
  27
  28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <sys/time.h>
  34 #include <sys/stat.h>
  35 #include <signal.h>
  36 #include <errno.h>
  37 #include <unistd.h>
  38
  39 #include "asterisk/sched.h"
  40 #include "asterisk/options.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/logger.h"
  43 #include "asterisk/file.h"
  44 #include "asterisk/image.h"
  45 #include "asterisk/translate.h"
  46 #include "asterisk/cli.h"
  47 #include "asterisk/lock.h"
  48
  49 /* XXX Why don't we just use the formats struct for this? */
  50 static AST_LIST_HEAD_STATIC(imagers, ast_imager);
  51
  52 int ast_image_register(struct ast_imager *img)
  53 {
  54         if (option_verbose > 1)
  55                 ast_verbose(VERBOSE_PREFIX_2 "Registered format '%s' (%s)\n", img->name, img->desc);
  56         AST_LIST_LOCK(&imagers);
  57         AST_LIST_INSERT_HEAD(&imagers, img, list);
  58         AST_LIST_UNLOCK(&imagers);
  59         return 0;
  60 }
  61
  62 void ast_image_unregister(struct ast_imager *img)
  63 {
  64         struct ast_imager *i;
  65
  66         AST_LIST_LOCK(&imagers);
  67         AST_LIST_TRAVERSE_SAFE_BEGIN(&imagers, i, list) {
  68                 if (i == img) {
  69                         AST_LIST_REMOVE_CURRENT(&imagers, list);
  70                         break;
  71                 }
  72         }
  73         AST_LIST_TRAVERSE_SAFE_END
  74         AST_LIST_UNLOCK(&imagers);
  75         if (i && (option_verbose > 1))
  76                 ast_verbose(VERBOSE_PREFIX_2 "Unregistered format '%s' (%s)\n", img->name, img->desc);
  77 }
  78
  79 int ast_supports_images(struct ast_channel *chan)
  80 {
  81         if (!chan || !chan->tech)
  82                 return 0;
  83         if (!chan->tech->send_image)
  84                 return 0;
  85         return 1;
  86 }
  87
  88 static int file_exists(char *filename)
  89 {
  90         int res;
  91         struct stat st;
  92         res = stat(filename, &st);
  93         if (!res)
  94                 return st.st_size;
  95         return 0;
  96 }
  97
  98 static void make_filename(char *buf, int len, char *filename, const char *preflang, char *ext)
  99 {
 100         if (filename[0] == '/') {
 101                 if (!ast_strlen_zero(preflang))
 102                         snprintf(buf, len, "%s-%s.%s", filename, preflang, ext);
 103                 else
 104                         snprintf(buf, len, "%s.%s", filename, ext);
 105         } else {
 106                 if (!ast_strlen_zero(preflang))
 107                         snprintf(buf, len, "%s/%s/%s-%s.%s", ast_config_AST_DATA_DIR, "images", filename, preflang, ext);
 108                 else
 109                         snprintf(buf, len, "%s/%s/%s.%s", ast_config_AST_DATA_DIR, "images", filename, ext);
 110         }
 111 }
 112
 113 struct ast_frame *ast_read_image(char *filename, const char *preflang, int format)
 114 {
 115         struct ast_imager *i;
 116         char buf[256];
 117         char tmp[80];
 118         char *e;
 119         struct ast_imager *found = NULL;
 120         int fd;
 121         int len=0;
 122         struct ast_frame *f = NULL;
 123
 124         AST_LIST_LOCK(&imagers);
 125         AST_LIST_TRAVERSE(&imagers, i, list) {
 126                 if (i->format & format) {
 127                         char *stringp=NULL;
 128                         ast_copy_string(tmp, i->exts, sizeof(tmp));
 129                         stringp=tmp;
 130                         e = strsep(&stringp, "|");
 131                         while(e) {
 132                                 make_filename(buf, sizeof(buf), filename, preflang, e);
 133                                 if ((len = file_exists(buf))) {
 134                                         found = i;
 135                                         break;
 136                                 }
 137                                 make_filename(buf, sizeof(buf), filename, NULL, e);
 138                                 if ((len = file_exists(buf))) {
 139                                         found = i;
 140                                         break;
 141                                 }
 142                                 e = strsep(&stringp, "|");
 143                         }
 144                 }
 145                 if (found)
 146                         break;
 147         }
 148
 149         if (found) {
 150                 fd = open(buf, O_RDONLY);
 151                 if (fd > -1) {
 152                         if (!found->identify || found->identify(fd)) {
 153                                 /* Reset file pointer */
 154                                 lseek(fd, 0, SEEK_SET);
 155                                 f = found->read_image(fd,len);
 156                         } else
 157                                 ast_log(LOG_WARNING, "%s does not appear to be a %s file\n", buf, found->name);
 158                         close(fd);
 159                 } else
 160                         ast_log(LOG_WARNING, "Unable to open '%s': %s\n", buf, strerror(errno));
 161         } else
 162                 ast_log(LOG_WARNING, "Image file '%s' not found\n", filename);
 163
 164         AST_LIST_UNLOCK(&imagers);
 165
 166         return f;
 167 }
 168
 169 int ast_send_image(struct ast_channel *chan, char *filename)
 170 {
 171         struct ast_frame *f;
 172         int res = -1;
 173         if (chan->tech->send_image) {
 174                 f = ast_read_image(filename, chan->language, -1);
 175                 if (f) {
 176                         res = chan->tech->send_image(chan, f);
 177                         ast_frfree(f);
 178                 }
 179         }
 180         return res;
 181 }
 182
 183 static int show_image_formats_deprecated(int fd, int argc, char *argv[])
 184 {
 185 #define FORMAT "%10s %10s %50s %10s\n"
 186 #define FORMAT2 "%10s %10s %50s %10s\n"
 187         struct ast_imager *i;
 188         if (argc != 3)
 189                 return RESULT_SHOWUSAGE;
 190         ast_cli(fd, FORMAT, "Name", "Extensions", "Description", "Format");
 191         AST_LIST_TRAVERSE(&imagers, i, list)
 192                 ast_cli(fd, FORMAT2, i->name, i->exts, i->desc, ast_getformatname(i->format));
 193         return RESULT_SUCCESS;
 194 }
 195
 196 static int show_image_formats(int fd, int argc, char *argv[])
 197 {
 198 #define FORMAT "%10s %10s %50s %10s\n"
 199 #define FORMAT2 "%10s %10s %50s %10s\n"
 200         struct ast_imager *i;
 201         if (argc != 4)
 202                 return RESULT_SHOWUSAGE;
 203         ast_cli(fd, FORMAT, "Name", "Extensions", "Description", "Format");
 204         AST_LIST_TRAVERSE(&imagers, i, list)
 205                 ast_cli(fd, FORMAT2, i->name, i->exts, i->desc, ast_getformatname(i->format));
 206         return RESULT_SUCCESS;
 207 }
 208
 209 struct ast_cli_entry cli_show_image_formats_deprecated = {
 210         { "show", "image", "formats" },
 211         show_image_formats_deprecated, NULL,
 212         NULL };
 213
 214 struct ast_cli_entry cli_image[] = {
 215         { { "core", "show", "image", "formats" },
 216         show_image_formats, "Displays image formats",
 217         "Usage: core show image formats\n"
 218         "       displays currently registered image formats (if any)\n", NULL, &cli_show_image_formats_deprecated },
 219 };
 220
 221 int ast_image_init(void)
 222 {
 223         ast_cli_register_multiple(cli_image, sizeof(cli_image) / sizeof(struct ast_cli_entry));
 224         return 0;
 225 }