formats/format_jpeg.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, 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 JPEG File format support.
  22  *
  23  * \arg File name extension: jpeg, jpg
  24  * \ingroup formats
  25  */
  26
  27 #include "asterisk.h"
  28
  29 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  30
  31 #include <sys/types.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <stdlib.h>
  35 #include <sys/time.h>
  36 #include <stdio.h>
  37 #include <unistd.h>
  38 #include <errno.h>
  39 #include <string.h>
  40
  41 #include "asterisk/channel.h"
  42 #include "asterisk/file.h"
  43 #include "asterisk/logger.h"
  44 #include "asterisk/sched.h"
  45 #include "asterisk/module.h"
  46 #include "asterisk/image.h"
  47 #include "asterisk/lock.h"
  48 #include "asterisk/endian.h"
  49
  50 static struct ast_frame *jpeg_read_image(int fd, int len)
  51 {
  52         struct ast_frame fr;
  53         int res;
  54         char buf[65536];
  55         if (len > sizeof(buf) || len < 0) {
  56                 ast_log(LOG_WARNING, "JPEG image too large to read\n");
  57                 return NULL;
  58         }
  59         res = read(fd, buf, len);
  60         if (res < len) {
  61                 ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
  62         }
  63         memset(&fr, 0, sizeof(fr));
  64         fr.frametype = AST_FRAME_IMAGE;
  65         fr.subclass = AST_FORMAT_JPEG;
  66         fr.data = buf;
  67         fr.src = "JPEG Read";
  68         fr.datalen = len;
  69         return ast_frisolate(&fr);
  70 }
  71
  72 static int jpeg_identify(int fd)
  73 {
  74         char buf[10];
  75         int res;
  76         res = read(fd, buf, sizeof(buf));
  77         if (res < sizeof(buf))
  78                 return 0;
  79         if (memcmp(buf + 6, "JFIF", 4))
  80                 return 0;
  81         return 1;
  82 }
  83
  84 static int jpeg_write_image(int fd, struct ast_frame *fr)
  85 {
  86         int res=0;
  87         if (fr->frametype != AST_FRAME_IMAGE) {
  88                 ast_log(LOG_WARNING, "Not an image\n");
  89                 return -1;
  90         }
  91         if (fr->subclass != AST_FORMAT_JPEG) {
  92                 ast_log(LOG_WARNING, "Not a jpeg image\n");
  93                 return -1;
  94         }
  95         if (fr->datalen) {
  96                 res = write(fd, fr->data, fr->datalen);
  97                 if (res != fr->datalen) {
  98                         ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
  99                         return -1;
 100                 }
 101         }
 102         return res;
 103 }
 104
 105 static struct ast_imager jpeg_format = {
 106         "jpg",
 107         "JPEG (Joint Picture Experts Group)",
 108         "jpg|jpeg",
 109         AST_FORMAT_JPEG,
 110         jpeg_read_image,
 111         jpeg_identify,
 112         jpeg_write_image,
 113 };
 114
 115 static int load_module(void)
 116 {
 117         return ast_image_register(&jpeg_format);
 118 }
 119
 120 static int unload_module(void)
 121 {
 122         ast_image_unregister(&jpeg_format);
 123
 124         return 0;
 125 }
 126
 127 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "JPEG (Joint Picture Experts Group) Image Format");