/* * Copyright (c) 2001 Michael David Adams. * All rights reserved. *//* __START_OF_JASPER_LICENSE__ *  * JasPer Software License *  * IMAGE POWER JPEG-2000 PUBLIC LICENSE * ************************************ *  * WHEREAS: *  * Permission is hereby granted, free of charge, to any person (the "User") * obtaining a copy of this software and associated documentation, to deal * in the JasPer Software without restriction, including without limitation * the right to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the JasPer Software (in source and binary forms), * and to permit persons to whom the JasPer Software is furnished to do so, * provided further that the License Conditions below are met. *  * License Conditions * ****************** *  * A.  Redistributions of source code must retain the above copyright notice, * and this list of conditions, and the following disclaimer. *  * B.  Redistributions in binary form must reproduce the above copyright * notice, and this list of conditions, and the following disclaimer in * the documentation and/or other materials provided with the distribution. *  * C.  Neither the name of Image Power, Inc. nor any other contributor * (including, but not limited to, the University of British Columbia and * Michael David Adams) may be used to endorse or promote products derived * from this software without specific prior written permission. *  * D.  User agrees that it shall not commence any action against Image Power, * Inc., the University of British Columbia, Michael David Adams, or any * other contributors (collectively "Licensors") for infringement of any * intellectual property rights ("IPR") held by the User in respect of any * technology that User owns or has a right to license or sublicense and * which is an element required in order to claim compliance with ISO/IEC * 15444-1 (i.e., JPEG-2000 Part 1).  "IPR" means all intellectual property * rights worldwide arising under statutory or common law, and whether * or not perfected, including, without limitation, all (i) patents and * patent applications owned or licensable by User; (ii) rights associated * with works of authorship including copyrights, copyright applications, * copyright registrations, mask work rights, mask work applications, * mask work registrations; (iii) rights relating to the protection of * trade secrets and confidential information; (iv) any right analogous * to those set forth in subsections (i), (ii), or (iii) and any other * proprietary rights relating to intangible property (other than trademark, * trade dress, or service mark rights); and (v) divisions, continuations, * renewals, reissues and extensions of the foregoing (as and to the extent * applicable) now existing, hereafter filed, issued or acquired. *  * E.  If User commences an infringement action against any Licensor(s) then * such Licensor(s) shall have the right to terminate User's license and * all sublicenses that have been granted hereunder by User to other parties. *  * F.  This software is for use only in hardware or software products that * are compliant with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1).  No license * or right to this Software is granted for products that do not comply * with ISO/IEC 15444-1.  The JPEG-2000 Part 1 standard can be purchased * from the ISO. *  * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. * NO USE OF THE JASPER SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER * THIS DISCLAIMER.  THE JASPER SOFTWARE IS PROVIDED BY THE LICENSORS AND * CONTRIBUTORS UNDER THIS LICENSE ON AN ``AS-IS'' BASIS, WITHOUT WARRANTY * OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, * WARRANTIES THAT THE JASPER SOFTWARE IS FREE OF DEFECTS, IS MERCHANTABLE, * IS FIT FOR A PARTICULAR PURPOSE OR IS NON-INFRINGING.  THOSE INTENDING * TO USE THE JASPER SOFTWARE OR MODIFICATIONS THEREOF FOR USE IN HARDWARE * OR SOFTWARE PRODUCTS ARE ADVISED THAT THEIR USE MAY INFRINGE EXISTING * PATENTS, COPYRIGHTS, TRADEMARKS, OR OTHER INTELLECTUAL PROPERTY RIGHTS. * THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE JASPER SOFTWARE * IS WITH THE USER.  SHOULD ANY PART OF THE JASPER SOFTWARE PROVE DEFECTIVE * IN ANY RESPECT, THE USER (AND NOT THE INITIAL DEVELOPERS, THE UNIVERSITY * OF BRITISH COLUMBIA, IMAGE POWER, INC., MICHAEL DAVID ADAMS, OR ANY * OTHER CONTRIBUTOR) SHALL ASSUME THE COST OF ANY NECESSARY SERVICING, * REPAIR OR CORRECTION.  UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, * WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE * INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC., * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE * JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO * THE USER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR * CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, * DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR * MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF * SUCH PARTY HAD BEEN INFORMED, OR OUGHT TO HAVE KNOWN, OF THE POSSIBILITY * OF SUCH DAMAGES.  THE JASPER SOFTWARE AND UNDERLYING TECHNOLOGY ARE NOT * FAULT-TOLERANT AND ARE NOT DESIGNED, MANUFACTURED OR INTENDED FOR USE OR * RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING * FAIL-SAFE PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT * LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE * JASPER SOFTWARE OR UNDERLYING TECHNOLOGY OR PRODUCT COULD LEAD DIRECTLY * TO DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE * ("HIGH RISK ACTIVITIES").  LICENSOR SPECIFICALLY DISCLAIMS ANY EXPRESS * OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.  USER WILL NOT * KNOWINGLY USE, DISTRIBUTE OR RESELL THE JASPER SOFTWARE OR UNDERLYING * TECHNOLOGY OR PRODUCTS FOR HIGH RISK ACTIVITIES AND WILL ENSURE THAT ITS * CUSTOMERS AND END-USERS OF ITS PRODUCTS ARE PROVIDED WITH A COPY OF THE * NOTICE SPECIFIED IN THIS SECTION. *  * __END_OF_JASPER_LICENSE__ *//******************************************************************************\* Includes.\******************************************************************************/#include <stdio.h>#include <assert.h>#include "jasper/jas_stream.h"#include "jpg_cod.h"/******************************************************************************\* Code for validate operation.\******************************************************************************/int jpg_validate(jas_stream_t *in){	uchar buf[JPG_MAGICLEN];	int i;	int n;	assert(JAS_STREAM_MAXPUTBACK >= JPG_MAGICLEN);	/* Read the validation data (i.e., the data used for detecting	  the format). */	if ((n = jas_stream_read(in, buf, JPG_MAGICLEN)) < 0) {		return -1;	}	/* Put the validation data back onto the stream, so that the	  stream position will not be changed. */	for (i = n - 1; i >= 0; --i) {		if (jas_stream_ungetc(in, buf[i]) == EOF) {			return -1;		}	}	/* Did we read enough data? */	if (n < JPG_MAGICLEN) {		return -1;	}	/* Does this look like JPEG? */	if (buf[0] != (JPG_MAGIC >> 8) || buf[1] != (JPG_MAGIC & 0xff)) {		return -1;	}	return 0;}