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385 README
@@ -0,0 +1,385 @@
+The Independent JPEG Group's JPEG software
+==========================================
+
+README for release 6b of 27-Mar-1998
+====================================
+
+This distribution contains the sixth public release of the Independent JPEG
+Group's free JPEG software. You are welcome to redistribute this software and
+to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
+
+Serious users of this software (particularly those incorporating it into
+larger programs) should contact IJG at jpeg-info@uunet.uu.net to be added to
+our electronic mailing list. Mailing list members are notified of updates
+and have a chance to participate in technical discussions, etc.
+
+This software is the work of Tom Lane, Philip Gladstone, Jim Boucher,
+Lee Crocker, Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi,
+Guido Vollbeding, Ge' Weijers, and other members of the Independent JPEG
+Group.
+
+IJG is not affiliated with the official ISO JPEG standards committee.
+
+
+DOCUMENTATION ROADMAP
+=====================
+
+This file contains the following sections:
+
+OVERVIEW General description of JPEG and the IJG software.
+LEGAL ISSUES Copyright, lack of warranty, terms of distribution.
+REFERENCES Where to learn more about JPEG.
+ARCHIVE LOCATIONS Where to find newer versions of this software.
+RELATED SOFTWARE Other stuff you should get.
+FILE FORMAT WARS Software *not* to get.
+TO DO Plans for future IJG releases.
+
+Other documentation files in the distribution are:
+
+User documentation:
+ install.doc How to configure and install the IJG software.
+ usage.doc Usage instructions for cjpeg, djpeg, jpegtran,
+ rdjpgcom, and wrjpgcom.
+ *.1 Unix-style man pages for programs (same info as usage.doc).
+ wizard.doc Advanced usage instructions for JPEG wizards only.
+ change.log Version-to-version change highlights.
+Programmer and internal documentation:
+ libjpeg.doc How to use the JPEG library in your own programs.
+ example.c Sample code for calling the JPEG library.
+ structure.doc Overview of the JPEG library's internal structure.
+ filelist.doc Road map of IJG files.
+ coderules.doc Coding style rules --- please read if you contribute code.
+
+Please read at least the files install.doc and usage.doc. Useful information
+can also be found in the JPEG FAQ (Frequently Asked Questions) article. See
+ARCHIVE LOCATIONS below to find out where to obtain the FAQ article.
+
+If you want to understand how the JPEG code works, we suggest reading one or
+more of the REFERENCES, then looking at the documentation files (in roughly
+the order listed) before diving into the code.
+
+
+OVERVIEW
+========
+
+This package contains C software to implement JPEG image compression and
+decompression. JPEG (pronounced "jay-peg") is a standardized compression
+method for full-color and gray-scale images. JPEG is intended for compressing
+"real-world" scenes; line drawings, cartoons and other non-realistic images
+are not its strong suit. JPEG is lossy, meaning that the output image is not
+exactly identical to the input image. Hence you must not use JPEG if you
+have to have identical output bits. However, on typical photographic images,
+very good compression levels can be obtained with no visible change, and
+remarkably high compression levels are possible if you can tolerate a
+low-quality image. For more details, see the references, or just experiment
+with various compression settings.
+
+This software implements JPEG baseline, extended-sequential, and progressive
+compression processes. Provision is made for supporting all variants of these
+processes, although some uncommon parameter settings aren't implemented yet.
+For legal reasons, we are not distributing code for the arithmetic-coding
+variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
+the hierarchical or lossless processes defined in the standard.
+
+We provide a set of library routines for reading and writing JPEG image files,
+plus two sample applications "cjpeg" and "djpeg", which use the library to
+perform conversion between JPEG and some other popular image file formats.
+The library is intended to be reused in other applications.
+
+In order to support file conversion and viewing software, we have included
+considerable functionality beyond the bare JPEG coding/decoding capability;
+for example, the color quantization modules are not strictly part of JPEG
+decoding, but they are essential for output to colormapped file formats or
+colormapped displays. These extra functions can be compiled out of the
+library if not required for a particular application. We have also included
+"jpegtran", a utility for lossless transcoding between different JPEG
+processes, and "rdjpgcom" and "wrjpgcom", two simple applications for
+inserting and extracting textual comments in JFIF files.
+
+The emphasis in designing this software has been on achieving portability and
+flexibility, while also making it fast enough to be useful. In particular,
+the software is not intended to be read as a tutorial on JPEG. (See the
+REFERENCES section for introductory material.) Rather, it is intended to
+be reliable, portable, industrial-strength code. We do not claim to have
+achieved that goal in every aspect of the software, but we strive for it.
+
+We welcome the use of this software as a component of commercial products.
+No royalty is required, but we do ask for an acknowledgement in product
+documentation, as described under LEGAL ISSUES.
+
+
+LEGAL ISSUES
+============
+
+In plain English:
+
+1. We don't promise that this software works. (But if you find any bugs,
+ please let us know!)
+2. You can use this software for whatever you want. You don't have to pay us.
+3. You may not pretend that you wrote this software. If you use it in a
+ program, you must acknowledge somewhere in your documentation that
+ you've used the IJG code.
+
+In legalese:
+
+The authors make NO WARRANTY or representation, either express or implied,
+with respect to this software, its quality, accuracy, merchantability, or
+fitness for a particular purpose. This software is provided "AS IS", and you,
+its user, assume the entire risk as to its quality and accuracy.
+
+This software is copyright (C) 1991-1998, Thomas G. Lane.
+All Rights Reserved except as specified below.
+
+Permission is hereby granted to use, copy, modify, and distribute this
+software (or portions thereof) for any purpose, without fee, subject to these
+conditions:
+(1) If any part of the source code for this software is distributed, then this
+README file must be included, with this copyright and no-warranty notice
+unaltered; and any additions, deletions, or changes to the original files
+must be clearly indicated in accompanying documentation.
+(2) If only executable code is distributed, then the accompanying
+documentation must state that "this software is based in part on the work of
+the Independent JPEG Group".
+(3) Permission for use of this software is granted only if the user accepts
+full responsibility for any undesirable consequences; the authors accept
+NO LIABILITY for damages of any kind.
+
+These conditions apply to any software derived from or based on the IJG code,
+not just to the unmodified library. If you use our work, you ought to
+acknowledge us.
+
+Permission is NOT granted for the use of any IJG author's name or company name
+in advertising or publicity relating to this software or products derived from
+it. This software may be referred to only as "the Independent JPEG Group's
+software".
+
+We specifically permit and encourage the use of this software as the basis of
+commercial products, provided that all warranty or liability claims are
+assumed by the product vendor.
+
+
+ansi2knr.c is included in this distribution by permission of L. Peter Deutsch,
+sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA.
+ansi2knr.c is NOT covered by the above copyright and conditions, but instead
+by the usual distribution terms of the Free Software Foundation; principally,
+that you must include source code if you redistribute it. (See the file
+ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part
+of any program generated from the IJG code, this does not limit you more than
+the foregoing paragraphs do.
+
+The Unix configuration script "configure" was produced with GNU Autoconf.
+It is copyright by the Free Software Foundation but is freely distributable.
+The same holds for its supporting scripts (config.guess, config.sub,
+ltconfig, ltmain.sh). Another support script, install-sh, is copyright
+by M.I.T. but is also freely distributable.
+
+It appears that the arithmetic coding option of the JPEG spec is covered by
+patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot
+legally be used without obtaining one or more licenses. For this reason,
+support for arithmetic coding has been removed from the free JPEG software.
+(Since arithmetic coding provides only a marginal gain over the unpatented
+Huffman mode, it is unlikely that very many implementations will support it.)
+So far as we are aware, there are no patent restrictions on the remaining
+code.
+
+The IJG distribution formerly included code to read and write GIF files.
+To avoid entanglement with the Unisys LZW patent, GIF reading support has
+been removed altogether, and the GIF writer has been simplified to produce
+"uncompressed GIFs". This technique does not use the LZW algorithm; the
+resulting GIF files are larger than usual, but are readable by all standard
+GIF decoders.
+
+We are required to state that
+ "The Graphics Interchange Format(c) is the Copyright property of
+ CompuServe Incorporated. GIF(sm) is a Service Mark property of
+ CompuServe Incorporated."
+
+
+REFERENCES
+==========
+
+We highly recommend reading one or more of these references before trying to
+understand the innards of the JPEG software.
+
+The best short technical introduction to the JPEG compression algorithm is
+ Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
+ Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
+(Adjacent articles in that issue discuss MPEG motion picture compression,
+applications of JPEG, and related topics.) If you don't have the CACM issue
+handy, a PostScript file containing a revised version of Wallace's article is
+available at ftp://ftp.uu.net/graphics/jpeg/wallace.ps.gz. The file (actually
+a preprint for an article that appeared in IEEE Trans. Consumer Electronics)
+omits the sample images that appeared in CACM, but it includes corrections
+and some added material. Note: the Wallace article is copyright ACM and IEEE,
+and it may not be used for commercial purposes.
+
+A somewhat less technical, more leisurely introduction to JPEG can be found in
+"The Data Compression Book" by Mark Nelson and Jean-loup Gailly, published by
+M&T Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1. This book provides
+good explanations and example C code for a multitude of compression methods
+including JPEG. It is an excellent source if you are comfortable reading C
+code but don't know much about data compression in general. The book's JPEG
+sample code is far from industrial-strength, but when you are ready to look
+at a full implementation, you've got one here...
+
+The best full description of JPEG is the textbook "JPEG Still Image Data
+Compression Standard" by William B. Pennebaker and Joan L. Mitchell, published
+by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1. Price US$59.95, 638 pp.
+The book includes the complete text of the ISO JPEG standards (DIS 10918-1
+and draft DIS 10918-2). This is by far the most complete exposition of JPEG
+in existence, and we highly recommend it.
+
+The JPEG standard itself is not available electronically; you must order a
+paper copy through ISO or ITU. (Unless you feel a need to own a certified
+official copy, we recommend buying the Pennebaker and Mitchell book instead;
+it's much cheaper and includes a great deal of useful explanatory material.)
+In the USA, copies of the standard may be ordered from ANSI Sales at (212)
+642-4900, or from Global Engineering Documents at (800) 854-7179. (ANSI
+doesn't take credit card orders, but Global does.) It's not cheap: as of
+1992, ANSI was charging $95 for Part 1 and $47 for Part 2, plus 7%
+shipping/handling. The standard is divided into two parts, Part 1 being the
+actual specification, while Part 2 covers compliance testing methods. Part 1
+is titled "Digital Compression and Coding of Continuous-tone Still Images,
+Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
+10918-1, ITU-T T.81. Part 2 is titled "Digital Compression and Coding of
+Continuous-tone Still Images, Part 2: Compliance testing" and has document
+numbers ISO/IEC IS 10918-2, ITU-T T.83.
+
+Some extensions to the original JPEG standard are defined in JPEG Part 3,
+a newer ISO standard numbered ISO/IEC IS 10918-3 and ITU-T T.84. IJG
+currently does not support any Part 3 extensions.
+
+The JPEG standard does not specify all details of an interchangeable file
+format. For the omitted details we follow the "JFIF" conventions, revision
+1.02. A copy of the JFIF spec is available from:
+ Literature Department
+ C-Cube Microsystems, Inc.
+ 1778 McCarthy Blvd.
+ Milpitas, CA 95035
+ phone (408) 944-6300, fax (408) 944-6314
+A PostScript version of this document is available by FTP at
+ftp://ftp.uu.net/graphics/jpeg/jfif.ps.gz. There is also a plain text
+version at ftp://ftp.uu.net/graphics/jpeg/jfif.txt.gz, but it is missing
+the figures.
+
+The TIFF 6.0 file format specification can be obtained by FTP from
+ftp://ftp.sgi.com/graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme
+found in the TIFF 6.0 spec of 3-June-92 has a number of serious problems.
+IJG does not recommend use of the TIFF 6.0 design (TIFF Compression tag 6).
+Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
+(Compression tag 7). Copies of this Note can be obtained from ftp.sgi.com or
+from ftp://ftp.uu.net/graphics/jpeg/. It is expected that the next revision
+of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
+Although IJG's own code does not support TIFF/JPEG, the free libtiff library
+uses our library to implement TIFF/JPEG per the Note. libtiff is available
+from ftp://ftp.sgi.com/graphics/tiff/.
+
+
+ARCHIVE LOCATIONS
+=================
+
+The "official" archive site for this software is ftp.uu.net (Internet
+address 192.48.96.9). The most recent released version can always be found
+there in directory graphics/jpeg. This particular version will be archived
+as ftp://ftp.uu.net/graphics/jpeg/jpegsrc.v6b.tar.gz. If you don't have
+direct Internet access, UUNET's archives are also available via UUCP; contact
+help@uunet.uu.net for information on retrieving files that way.
+
+Numerous Internet sites maintain copies of the UUNET files. However, only
+ftp.uu.net is guaranteed to have the latest official version.
+
+You can also obtain this software in DOS-compatible "zip" archive format from
+the SimTel archives (ftp://ftp.simtel.net/pub/simtelnet/msdos/graphics/), or
+on CompuServe in the Graphics Support forum (GO CIS:GRAPHSUP), library 12
+"JPEG Tools". Again, these versions may sometimes lag behind the ftp.uu.net
+release.
+
+The JPEG FAQ (Frequently Asked Questions) article is a useful source of
+general information about JPEG. It is updated constantly and therefore is
+not included in this distribution. The FAQ is posted every two weeks to
+Usenet newsgroups comp.graphics.misc, news.answers, and other groups.
+It is available on the World Wide Web at http://www.faqs.org/faqs/jpeg-faq/
+and other news.answers archive sites, including the official news.answers
+archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/jpeg-faq/.
+If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu
+with body
+ send usenet/news.answers/jpeg-faq/part1
+ send usenet/news.answers/jpeg-faq/part2
+
+
+RELATED SOFTWARE
+================
+
+Numerous viewing and image manipulation programs now support JPEG. (Quite a
+few of them use this library to do so.) The JPEG FAQ described above lists
+some of the more popular free and shareware viewers, and tells where to
+obtain them on Internet.
+
+If you are on a Unix machine, we highly recommend Jef Poskanzer's free
+PBMPLUS software, which provides many useful operations on PPM-format image
+files. In particular, it can convert PPM images to and from a wide range of
+other formats, thus making cjpeg/djpeg considerably more useful. The latest
+version is distributed by the NetPBM group, and is available from numerous
+sites, notably ftp://wuarchive.wustl.edu/graphics/graphics/packages/NetPBM/.
+Unfortunately PBMPLUS/NETPBM is not nearly as portable as the IJG software is;
+you are likely to have difficulty making it work on any non-Unix machine.
+
+A different free JPEG implementation, written by the PVRG group at Stanford,
+is available from ftp://havefun.stanford.edu/pub/jpeg/. This program
+is designed for research and experimentation rather than production use;
+it is slower, harder to use, and less portable than the IJG code, but it
+is easier to read and modify. Also, the PVRG code supports lossless JPEG,
+which we do not. (On the other hand, it doesn't do progressive JPEG.)
+
+
+FILE FORMAT WARS
+================
+
+Some JPEG programs produce files that are not compatible with our library.
+The root of the problem is that the ISO JPEG committee failed to specify a
+concrete file format. Some vendors "filled in the blanks" on their own,
+creating proprietary formats that no one else could read. (For example, none
+of the early commercial JPEG implementations for the Macintosh were able to
+exchange compressed files.)
+
+The file format we have adopted is called JFIF (see REFERENCES). This format
+has been agreed to by a number of major commercial JPEG vendors, and it has
+become the de facto standard. JFIF is a minimal or "low end" representation.
+We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF
+Technical Note #2) for "high end" applications that need to record a lot of
+additional data about an image. TIFF/JPEG is fairly new and not yet widely
+supported, unfortunately.
+
+The upcoming JPEG Part 3 standard defines a file format called SPIFF.
+SPIFF is interoperable with JFIF, in the sense that most JFIF decoders should
+be able to read the most common variant of SPIFF. SPIFF has some technical
+advantages over JFIF, but its major claim to fame is simply that it is an
+official standard rather than an informal one. At this point it is unclear
+whether SPIFF will supersede JFIF or whether JFIF will remain the de-facto
+standard. IJG intends to support SPIFF once the standard is frozen, but we
+have not decided whether it should become our default output format or not.
+(In any case, our decoder will remain capable of reading JFIF indefinitely.)
+
+Various proprietary file formats incorporating JPEG compression also exist.
+We have little or no sympathy for the existence of these formats. Indeed,
+one of the original reasons for developing this free software was to help
+force convergence on common, open format standards for JPEG files. Don't
+use a proprietary file format!
+
+
+TO DO
+=====
+
+The major thrust for v7 will probably be improvement of visual quality.
+The current method for scaling the quantization tables is known not to be
+very good at low Q values. We also intend to investigate block boundary
+smoothing, "poor man's variable quantization", and other means of improving
+quality-vs-file-size performance without sacrificing compatibility.
+
+In future versions, we are considering supporting some of the upcoming JPEG
+Part 3 extensions --- principally, variable quantization and the SPIFF file
+format.
+
+As always, speeding things up is of great interest.
+
+Please send bug reports, offers of help, etc. to jpeg-info@uunet.uu.net.
36 ansi2knr.1
@@ -0,0 +1,36 @@
+.TH ANSI2KNR 1 "19 Jan 1996"
+.SH NAME
+ansi2knr \- convert ANSI C to Kernighan & Ritchie C
+.SH SYNOPSIS
+.I ansi2knr
+[--varargs] input_file [output_file]
+.SH DESCRIPTION
+If no output_file is supplied, output goes to stdout.
+.br
+There are no error messages.
+.sp
+.I ansi2knr
+recognizes function definitions by seeing a non-keyword identifier at the left
+margin, followed by a left parenthesis, with a right parenthesis as the last
+character on the line, and with a left brace as the first token on the
+following line (ignoring possible intervening comments). It will recognize a
+multi-line header provided that no intervening line ends with a left or right
+brace or a semicolon. These algorithms ignore whitespace and comments, except
+that the function name must be the first thing on the line.
+.sp
+The following constructs will confuse it:
+.br
+ - Any other construct that starts at the left margin and follows the
+above syntax (such as a macro or function call).
+.br
+ - Some macros that tinker with the syntax of the function header.
+.sp
+The --varargs switch is obsolete, and is recognized only for
+backwards compatibility. The present version of
+.I ansi2knr
+will always attempt to convert a ... argument to va_alist and va_dcl.
+.SH AUTHOR
+L. Peter Deutsch <ghost@aladdin.com> wrote the original ansi2knr and
+continues to maintain the current version; most of the code in the current
+version is his work. ansi2knr also includes contributions by Francois
+Pinard <pinard@iro.umontreal.ca> and Jim Avera <jima@netcom.com>.
693 ansi2knr.c
@@ -0,0 +1,693 @@
+/* ansi2knr.c */
+/* Convert ANSI C function definitions to K&R ("traditional C") syntax */
+
+/*
+ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY. No author or distributor accepts responsibility to anyone for the
+consequences of using it or for whether it serves any particular purpose or
+works at all, unless he says so in writing. Refer to the GNU General Public
+License (the "GPL") for full details.
+
+Everyone is granted permission to copy, modify and redistribute ansi2knr,
+but only under the conditions described in the GPL. A copy of this license
+is supposed to have been given to you along with ansi2knr so you can know
+your rights and responsibilities. It should be in a file named COPYLEFT.
+[In the IJG distribution, the GPL appears below, not in a separate file.]
+Among other things, the copyright notice and this notice must be preserved
+on all copies.
+
+We explicitly state here what we believe is already implied by the GPL: if
+the ansi2knr program is distributed as a separate set of sources and a
+separate executable file which are aggregated on a storage medium together
+with another program, this in itself does not bring the other program under
+the GPL, nor does the mere fact that such a program or the procedures for
+constructing it invoke the ansi2knr executable bring any other part of the
+program under the GPL.
+*/
+
+/*
+---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
+----- These terms do NOT apply to the JPEG software itself; see README ------
+
+ GHOSTSCRIPT GENERAL PUBLIC LICENSE
+ (Clarified 11 Feb 1988)
+
+ Copyright (C) 1988 Richard M. Stallman
+ Everyone is permitted to copy and distribute verbatim copies of this
+ license, but changing it is not allowed. You can also use this wording
+ to make the terms for other programs.
+
+ The license agreements of most software companies keep you at the
+mercy of those companies. By contrast, our general public license is
+intended to give everyone the right to share Ghostscript. To make sure
+that you get the rights we want you to have, we need to make
+restrictions that forbid anyone to deny you these rights or to ask you
+to surrender the rights. Hence this license agreement.
+
+ Specifically, we want to make sure that you have the right to give
+away copies of Ghostscript, that you receive source code or else can get
+it if you want it, that you can change Ghostscript or use pieces of it
+in new free programs, and that you know you can do these things.
+
+ To make sure that everyone has such rights, we have to forbid you to
+deprive anyone else of these rights. For example, if you distribute
+copies of Ghostscript, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must tell them their rights.
+
+ Also, for our own protection, we must make certain that everyone finds
+out that there is no warranty for Ghostscript. If Ghostscript is
+modified by someone else and passed on, we want its recipients to know
+that what they have is not what we distributed, so that any problems
+introduced by others will not reflect on our reputation.
+
+ Therefore we (Richard M. Stallman and the Free Software Foundation,
+Inc.) make the following terms which say what you must do to be allowed
+to distribute or change Ghostscript.
+
+
+ COPYING POLICIES
+
+ 1. You may copy and distribute verbatim copies of Ghostscript source
+code as you receive it, in any medium, provided that you conspicuously
+and appropriately publish on each copy a valid copyright and license
+notice "Copyright (C) 1989 Aladdin Enterprises. All rights reserved.
+Distributed by Free Software Foundation, Inc." (or with whatever year is
+appropriate); keep intact the notices on all files that refer to this
+License Agreement and to the absence of any warranty; and give any other
+recipients of the Ghostscript program a copy of this License Agreement
+along with the program. You may charge a distribution fee for the
+physical act of transferring a copy.
+
+ 2. You may modify your copy or copies of Ghostscript or any portion of
+it, and copy and distribute such modifications under the terms of
+Paragraph 1 above, provided that you also do the following:
+
+ a) cause the modified files to carry prominent notices stating
+ that you changed the files and the date of any change; and
+
+ b) cause the whole of any work that you distribute or publish,
+ that in whole or in part contains or is a derivative of Ghostscript
+ or any part thereof, to be licensed at no charge to all third
+ parties on terms identical to those contained in this License
+ Agreement (except that you may choose to grant more extensive
+ warranty protection to some or all third parties, at your option).
+
+ c) You may charge a distribution fee for the physical act of
+ transferring a copy, and you may at your option offer warranty
+ protection in exchange for a fee.
+
+Mere aggregation of another unrelated program with this program (or its
+derivative) on a volume of a storage or distribution medium does not bring
+the other program under the scope of these terms.
+
+ 3. You may copy and distribute Ghostscript (or a portion or derivative
+of it, under Paragraph 2) in object code or executable form under the
+terms of Paragraphs 1 and 2 above provided that you also do one of the
+following:
+
+ a) accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of
+ Paragraphs 1 and 2 above; or,
+
+ b) accompany it with a written offer, valid for at least three
+ years, to give any third party free (except for a nominal
+ shipping charge) a complete machine-readable copy of the
+ corresponding source code, to be distributed under the terms of
+ Paragraphs 1 and 2 above; or,
+
+ c) accompany it with the information you received as to where the
+ corresponding source code may be obtained. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form alone.)
+
+For an executable file, complete source code means all the source code for
+all modules it contains; but, as a special exception, it need not include
+source code for modules which are standard libraries that accompany the
+operating system on which the executable file runs.
+
+ 4. You may not copy, sublicense, distribute or transfer Ghostscript
+except as expressly provided under this License Agreement. Any attempt
+otherwise to copy, sublicense, distribute or transfer Ghostscript is
+void and your rights to use the program under this License agreement
+shall be automatically terminated. However, parties who have received
+computer software programs from you with this License Agreement will not
+have their licenses terminated so long as such parties remain in full
+compliance.
+
+ 5. If you wish to incorporate parts of Ghostscript into other free
+programs whose distribution conditions are different, write to the Free
+Software Foundation at 675 Mass Ave, Cambridge, MA 02139. We have not
+yet worked out a simple rule that can be stated here, but we will often
+permit this. We will be guided by the two goals of preserving the free
+status of all derivatives of our free software and of promoting the
+sharing and reuse of software.
+
+Your comments and suggestions about our licensing policies and our
+software are welcome! Please contact the Free Software Foundation,
+Inc., 675 Mass Ave, Cambridge, MA 02139, or call (617) 876-3296.
+
+ NO WARRANTY
+
+ BECAUSE GHOSTSCRIPT IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
+NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT
+WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC, RICHARD
+M. STALLMAN, ALADDIN ENTERPRISES, L. PETER DEUTSCH, AND/OR OTHER PARTIES
+PROVIDE GHOSTSCRIPT "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
+EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF GHOSTSCRIPT IS WITH
+YOU. SHOULD GHOSTSCRIPT PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
+NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
+STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., L. PETER DEUTSCH, ALADDIN
+ENTERPRISES, AND/OR ANY OTHER PARTY WHO MAY MODIFY AND REDISTRIBUTE
+GHOSTSCRIPT AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING
+ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL, INCIDENTAL OR
+CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
+(INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A FAILURE OF THE
+PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) GHOSTSCRIPT, EVEN IF YOU
+HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM
+BY ANY OTHER PARTY.
+
+-------------------- End of file COPYLEFT ------------------------------
+*/
+
+/*
+ * Usage:
+ ansi2knr input_file [output_file]
+ * If no output_file is supplied, output goes to stdout.
+ * There are no error messages.
+ *
+ * ansi2knr recognizes function definitions by seeing a non-keyword
+ * identifier at the left margin, followed by a left parenthesis,
+ * with a right parenthesis as the last character on the line,
+ * and with a left brace as the first token on the following line
+ * (ignoring possible intervening comments).
+ * It will recognize a multi-line header provided that no intervening
+ * line ends with a left or right brace or a semicolon.
+ * These algorithms ignore whitespace and comments, except that
+ * the function name must be the first thing on the line.
+ * The following constructs will confuse it:
+ * - Any other construct that starts at the left margin and
+ * follows the above syntax (such as a macro or function call).
+ * - Some macros that tinker with the syntax of the function header.
+ */
+
+/*
+ * The original and principal author of ansi2knr is L. Peter Deutsch
+ * <ghost@aladdin.com>. Other authors are noted in the change history
+ * that follows (in reverse chronological order):
+ lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with
+ compilers that don't understand void, as suggested by
+ Tom Lane
+ lpd 96-01-15 changed to require that the first non-comment token
+ on the line following a function header be a left brace,
+ to reduce sensitivity to macros, as suggested by Tom Lane
+ <tgl@sss.pgh.pa.us>
+ lpd 95-06-22 removed #ifndefs whose sole purpose was to define
+ undefined preprocessor symbols as 0; changed all #ifdefs
+ for configuration symbols to #ifs
+ lpd 95-04-05 changed copyright notice to make it clear that
+ including ansi2knr in a program does not bring the entire
+ program under the GPL
+ lpd 94-12-18 added conditionals for systems where ctype macros
+ don't handle 8-bit characters properly, suggested by
+ Francois Pinard <pinard@iro.umontreal.ca>;
+ removed --varargs switch (this is now the default)
+ lpd 94-10-10 removed CONFIG_BROKETS conditional
+ lpd 94-07-16 added some conditionals to help GNU `configure',
+ suggested by Francois Pinard <pinard@iro.umontreal.ca>;
+ properly erase prototype args in function parameters,
+ contributed by Jim Avera <jima@netcom.com>;
+ correct error in writeblanks (it shouldn't erase EOLs)
+ lpd 89-xx-xx original version
+ */
+
+/* Most of the conditionals here are to make ansi2knr work with */
+/* or without the GNU configure machinery. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+
+#if HAVE_CONFIG_H
+
+/*
+ For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
+ This will define HAVE_CONFIG_H and so, activate the following lines.
+ */
+
+# if STDC_HEADERS || HAVE_STRING_H
+# include <string.h>
+# else
+# include <strings.h>
+# endif
+
+#else /* not HAVE_CONFIG_H */
+
+/* Otherwise do it the hard way */
+
+# ifdef BSD
+# include <strings.h>
+# else
+# ifdef VMS
+ extern int strlen(), strncmp();
+# else
+# include <string.h>
+# endif
+# endif
+
+#endif /* not HAVE_CONFIG_H */
+
+#if STDC_HEADERS
+# include <stdlib.h>
+#else
+/*
+ malloc and free should be declared in stdlib.h,
+ but if you've got a K&R compiler, they probably aren't.
+ */
+# ifdef MSDOS
+# include <malloc.h>
+# else
+# ifdef VMS
+ extern char *malloc();
+ extern void free();
+# else
+ extern char *malloc();
+ extern int free();
+# endif
+# endif
+
+#endif
+
+/*
+ * The ctype macros don't always handle 8-bit characters correctly.
+ * Compensate for this here.
+ */
+#ifdef isascii
+# undef HAVE_ISASCII /* just in case */
+# define HAVE_ISASCII 1
+#else
+#endif
+#if STDC_HEADERS || !HAVE_ISASCII
+# define is_ascii(c) 1
+#else
+# define is_ascii(c) isascii(c)
+#endif
+
+#define is_space(c) (is_ascii(c) && isspace(c))
+#define is_alpha(c) (is_ascii(c) && isalpha(c))
+#define is_alnum(c) (is_ascii(c) && isalnum(c))
+
+/* Scanning macros */
+#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
+#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
+
+/* Forward references */
+char *skipspace();
+int writeblanks();
+int test1();
+int convert1();
+
+/* The main program */
+int
+main(argc, argv)
+ int argc;
+ char *argv[];
+{ FILE *in, *out;
+#define bufsize 5000 /* arbitrary size */
+ char *buf;
+ char *line;
+ char *more;
+ /*
+ * In previous versions, ansi2knr recognized a --varargs switch.
+ * If this switch was supplied, ansi2knr would attempt to convert
+ * a ... argument to va_alist and va_dcl; if this switch was not
+ * supplied, ansi2knr would simply drop any such arguments.
+ * Now, ansi2knr always does this conversion, and we only
+ * check for this switch for backward compatibility.
+ */
+ int convert_varargs = 1;
+
+ if ( argc > 1 && argv[1][0] == '-' )
+ { if ( !strcmp(argv[1], "--varargs") )
+ { convert_varargs = 1;
+ argc--;
+ argv++;
+ }
+ else
+ { fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);
+ exit(1);
+ }
+ }
+ switch ( argc )
+ {
+ default:
+ printf("Usage: ansi2knr input_file [output_file]\n");
+ exit(0);
+ case 2:
+ out = stdout;
+ break;
+ case 3:
+ out = fopen(argv[2], "w");
+ if ( out == NULL )
+ { fprintf(stderr, "Cannot open output file %s\n", argv[2]);
+ exit(1);
+ }
+ }
+ in = fopen(argv[1], "r");
+ if ( in == NULL )
+ { fprintf(stderr, "Cannot open input file %s\n", argv[1]);
+ exit(1);
+ }
+ fprintf(out, "#line 1 \"%s\"\n", argv[1]);
+ buf = malloc(bufsize);
+ line = buf;
+ while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
+ {
+test: line += strlen(line);
+ switch ( test1(buf) )
+ {
+ case 2: /* a function header */
+ convert1(buf, out, 1, convert_varargs);
+ break;
+ case 1: /* a function */
+ /* Check for a { at the start of the next line. */
+ more = ++line;
+f: if ( line >= buf + (bufsize - 1) ) /* overflow check */
+ goto wl;
+ if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
+ goto wl;
+ switch ( *skipspace(more, 1) )
+ {
+ case '{':
+ /* Definitely a function header. */
+ convert1(buf, out, 0, convert_varargs);
+ fputs(more, out);
+ break;
+ case 0:
+ /* The next line was blank or a comment: */
+ /* keep scanning for a non-comment. */
+ line += strlen(line);
+ goto f;
+ default:
+ /* buf isn't a function header, but */
+ /* more might be. */
+ fputs(buf, out);
+ strcpy(buf, more);
+ line = buf;
+ goto test;
+ }
+ break;
+ case -1: /* maybe the start of a function */
+ if ( line != buf + (bufsize - 1) ) /* overflow check */
+ continue;
+ /* falls through */
+ default: /* not a function */
+wl: fputs(buf, out);
+ break;
+ }
+ line = buf;
+ }
+ if ( line != buf )
+ fputs(buf, out);
+ free(buf);
+ fclose(out);
+ fclose(in);
+ return 0;
+}
+
+/* Skip over space and comments, in either direction. */
+char *
+skipspace(p, dir)
+ register char *p;
+ register int dir; /* 1 for forward, -1 for backward */
+{ for ( ; ; )
+ { while ( is_space(*p) )
+ p += dir;
+ if ( !(*p == '/' && p[dir] == '*') )
+ break;
+ p += dir; p += dir;
+ while ( !(*p == '*' && p[dir] == '/') )
+ { if ( *p == 0 )
+ return p; /* multi-line comment?? */
+ p += dir;
+ }
+ p += dir; p += dir;
+ }
+ return p;
+}
+
+/*
+ * Write blanks over part of a string.
+ * Don't overwrite end-of-line characters.
+ */
+int
+writeblanks(start, end)
+ char *start;
+ char *end;
+{ char *p;
+ for ( p = start; p < end; p++ )
+ if ( *p != '\r' && *p != '\n' )
+ *p = ' ';
+ return 0;
+}
+
+/*
+ * Test whether the string in buf is a function definition.
+ * The string may contain and/or end with a newline.
+ * Return as follows:
+ * 0 - definitely not a function definition;
+ * 1 - definitely a function definition;
+ * 2 - definitely a function prototype (NOT USED);
+ * -1 - may be the beginning of a function definition,
+ * append another line and look again.
+ * The reason we don't attempt to convert function prototypes is that
+ * Ghostscript's declaration-generating macros look too much like
+ * prototypes, and confuse the algorithms.
+ */
+int
+test1(buf)
+ char *buf;
+{ register char *p = buf;
+ char *bend;
+ char *endfn;
+ int contin;
+
+ if ( !isidfirstchar(*p) )
+ return 0; /* no name at left margin */
+ bend = skipspace(buf + strlen(buf) - 1, -1);
+ switch ( *bend )
+ {
+ case ';': contin = 0 /*2*/; break;
+ case ')': contin = 1; break;
+ case '{': return 0; /* not a function */
+ case '}': return 0; /* not a function */
+ default: contin = -1;
+ }
+ while ( isidchar(*p) )
+ p++;
+ endfn = p;
+ p = skipspace(p, 1);
+ if ( *p++ != '(' )
+ return 0; /* not a function */
+ p = skipspace(p, 1);
+ if ( *p == ')' )
+ return 0; /* no parameters */
+ /* Check that the apparent function name isn't a keyword. */
+ /* We only need to check for keywords that could be followed */
+ /* by a left parenthesis (which, unfortunately, is most of them). */
+ { static char *words[] =
+ { "asm", "auto", "case", "char", "const", "double",
+ "extern", "float", "for", "if", "int", "long",
+ "register", "return", "short", "signed", "sizeof",
+ "static", "switch", "typedef", "unsigned",
+ "void", "volatile", "while", 0
+ };
+ char **key = words;
+ char *kp;
+ int len = endfn - buf;
+
+ while ( (kp = *key) != 0 )
+ { if ( strlen(kp) == len && !strncmp(kp, buf, len) )
+ return 0; /* name is a keyword */
+ key++;
+ }
+ }
+ return contin;
+}
+
+/* Convert a recognized function definition or header to K&R syntax. */
+int
+convert1(buf, out, header, convert_varargs)
+ char *buf;
+ FILE *out;
+ int header; /* Boolean */
+ int convert_varargs; /* Boolean */
+{ char *endfn;
+ register char *p;
+ char **breaks;
+ unsigned num_breaks = 2; /* for testing */
+ char **btop;
+ char **bp;
+ char **ap;
+ char *vararg = 0;
+
+ /* Pre-ANSI implementations don't agree on whether strchr */
+ /* is called strchr or index, so we open-code it here. */
+ for ( endfn = buf; *(endfn++) != '('; )
+ ;
+top: p = endfn;
+ breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
+ if ( breaks == 0 )
+ { /* Couldn't allocate break table, give up */
+ fprintf(stderr, "Unable to allocate break table!\n");
+ fputs(buf, out);
+ return -1;
+ }
+ btop = breaks + num_breaks * 2 - 2;
+ bp = breaks;
+ /* Parse the argument list */
+ do
+ { int level = 0;
+ char *lp = NULL;
+ char *rp;
+ char *end = NULL;
+
+ if ( bp >= btop )
+ { /* Filled up break table. */
+ /* Allocate a bigger one and start over. */
+ free((char *)breaks);
+ num_breaks <<= 1;
+ goto top;
+ }
+ *bp++ = p;
+ /* Find the end of the argument */
+ for ( ; end == NULL; p++ )
+ { switch(*p)
+ {
+ case ',':
+ if ( !level ) end = p;
+ break;
+ case '(':
+ if ( !level ) lp = p;
+ level++;
+ break;
+ case ')':
+ if ( --level < 0 ) end = p;
+ else rp = p;
+ break;
+ case '/':
+ p = skipspace(p, 1) - 1;
+ break;
+ default:
+ ;
+ }
+ }
+ /* Erase any embedded prototype parameters. */
+ if ( lp )
+ writeblanks(lp + 1, rp);
+ p--; /* back up over terminator */
+ /* Find the name being declared. */
+ /* This is complicated because of procedure and */
+ /* array modifiers. */
+ for ( ; ; )
+ { p = skipspace(p - 1, -1);
+ switch ( *p )
+ {
+ case ']': /* skip array dimension(s) */
+ case ')': /* skip procedure args OR name */
+ { int level = 1;
+ while ( level )
+ switch ( *--p )
+ {
+ case ']': case ')': level++; break;
+ case '[': case '(': level--; break;
+ case '/': p = skipspace(p, -1) + 1; break;
+ default: ;
+ }
+ }
+ if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
+ { /* We found the name being declared */
+ while ( !isidfirstchar(*p) )
+ p = skipspace(p, 1) + 1;
+ goto found;
+ }
+ break;
+ default:
+ goto found;
+ }
+ }
+found: if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
+ { if ( convert_varargs )
+ { *bp++ = "va_alist";
+ vararg = p-2;
+ }
+ else
+ { p++;
+ if ( bp == breaks + 1 ) /* sole argument */
+ writeblanks(breaks[0], p);
+ else
+ writeblanks(bp[-1] - 1, p);
+ bp--;
+ }
+ }
+ else
+ { while ( isidchar(*p) ) p--;
+ *bp++ = p+1;
+ }
+ p = end;
+ }
+ while ( *p++ == ',' );
+ *bp = p;
+ /* Make a special check for 'void' arglist */
+ if ( bp == breaks+2 )
+ { p = skipspace(breaks[0], 1);
+ if ( !strncmp(p, "void", 4) )
+ { p = skipspace(p+4, 1);
+ if ( p == breaks[2] - 1 )
+ { bp = breaks; /* yup, pretend arglist is empty */
+ writeblanks(breaks[0], p + 1);
+ }
+ }
+ }
+ /* Put out the function name and left parenthesis. */
+ p = buf;
+ while ( p != endfn ) putc(*p, out), p++;
+ /* Put out the declaration. */
+ if ( header )
+ { fputs(");", out);
+ for ( p = breaks[0]; *p; p++ )
+ if ( *p == '\r' || *p == '\n' )
+ putc(*p, out);
+ }
+ else
+ { for ( ap = breaks+1; ap < bp; ap += 2 )
+ { p = *ap;
+ while ( isidchar(*p) )
+ putc(*p, out), p++;
+ if ( ap < bp - 1 )
+ fputs(", ", out);
+ }
+ fputs(") ", out);
+ /* Put out the argument declarations */
+ for ( ap = breaks+2; ap <= bp; ap += 2 )
+ (*ap)[-1] = ';';
+ if ( vararg != 0 )
+ { *vararg = 0;
+ fputs(breaks[0], out); /* any prior args */
+ fputs("va_dcl", out); /* the final arg */
+ fputs(bp[0], out);
+ }
+ else
+ fputs(breaks[0], out);
+ }
+ free((char *)breaks);
+ return 0;
+}
132 cderror.h
@@ -0,0 +1,132 @@
+/*
+ * cderror.h
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file defines the error and message codes for the cjpeg/djpeg
+ * applications. These strings are not needed as part of the JPEG library
+ * proper.
+ * Edit this file to add new codes, or to translate the message strings to
+ * some other language.
+ */
+
+/*
+ * To define the enum list of message codes, include this file without
+ * defining macro JMESSAGE. To create a message string table, include it
+ * again with a suitable JMESSAGE definition (see jerror.c for an example).
+ */
+#ifndef JMESSAGE
+#ifndef CDERROR_H
+#define CDERROR_H
+/* First time through, define the enum list */
+#define JMAKE_ENUM_LIST
+#else
+/* Repeated inclusions of this file are no-ops unless JMESSAGE is defined */
+#define JMESSAGE(code,string)
+#endif /* CDERROR_H */
+#endif /* JMESSAGE */
+
+#ifdef JMAKE_ENUM_LIST
+
+typedef enum {
+
+#define JMESSAGE(code,string) code ,
+
+#endif /* JMAKE_ENUM_LIST */
+
+JMESSAGE(JMSG_FIRSTADDONCODE=1000, NULL) /* Must be first entry! */
+
+#ifdef BMP_SUPPORTED
+JMESSAGE(JERR_BMP_BADCMAP, "Unsupported BMP colormap format")
+JMESSAGE(JERR_BMP_BADDEPTH, "Only 8- and 24-bit BMP files are supported")
+JMESSAGE(JERR_BMP_BADHEADER, "Invalid BMP file: bad header length")
+JMESSAGE(JERR_BMP_BADPLANES, "Invalid BMP file: biPlanes not equal to 1")
+JMESSAGE(JERR_BMP_COLORSPACE, "BMP output must be grayscale or RGB")
+JMESSAGE(JERR_BMP_COMPRESSED, "Sorry, compressed BMPs not yet supported")
+JMESSAGE(JERR_BMP_NOT, "Not a BMP file - does not start with BM")
+JMESSAGE(JTRC_BMP, "%ux%u 24-bit BMP image")
+JMESSAGE(JTRC_BMP_MAPPED, "%ux%u 8-bit colormapped BMP image")
+JMESSAGE(JTRC_BMP_OS2, "%ux%u 24-bit OS2 BMP image")
+JMESSAGE(JTRC_BMP_OS2_MAPPED, "%ux%u 8-bit colormapped OS2 BMP image")
+#endif /* BMP_SUPPORTED */
+
+#ifdef GIF_SUPPORTED
+JMESSAGE(JERR_GIF_BUG, "GIF output got confused")
+JMESSAGE(JERR_GIF_CODESIZE, "Bogus GIF codesize %d")
+JMESSAGE(JERR_GIF_COLORSPACE, "GIF output must be grayscale or RGB")
+JMESSAGE(JERR_GIF_IMAGENOTFOUND, "Too few images in GIF file")
+JMESSAGE(JERR_GIF_NOT, "Not a GIF file")
+JMESSAGE(JTRC_GIF, "%ux%ux%d GIF image")
+JMESSAGE(JTRC_GIF_BADVERSION,
+ "Warning: unexpected GIF version number '%c%c%c'")
+JMESSAGE(JTRC_GIF_EXTENSION, "Ignoring GIF extension block of type 0x%02x")
+JMESSAGE(JTRC_GIF_NONSQUARE, "Caution: nonsquare pixels in input")
+JMESSAGE(JWRN_GIF_BADDATA, "Corrupt data in GIF file")
+JMESSAGE(JWRN_GIF_CHAR, "Bogus char 0x%02x in GIF file, ignoring")
+JMESSAGE(JWRN_GIF_ENDCODE, "Premature end of GIF image")
+JMESSAGE(JWRN_GIF_NOMOREDATA, "Ran out of GIF bits")
+#endif /* GIF_SUPPORTED */
+
+#ifdef PPM_SUPPORTED
+JMESSAGE(JERR_PPM_COLORSPACE, "PPM output must be grayscale or RGB")
+JMESSAGE(JERR_PPM_NONNUMERIC, "Nonnumeric data in PPM file")
+JMESSAGE(JERR_PPM_NOT, "Not a PPM/PGM file")
+JMESSAGE(JTRC_PGM, "%ux%u PGM image")
+JMESSAGE(JTRC_PGM_TEXT, "%ux%u text PGM image")
+JMESSAGE(JTRC_PPM, "%ux%u PPM image")
+JMESSAGE(JTRC_PPM_TEXT, "%ux%u text PPM image")
+#endif /* PPM_SUPPORTED */
+
+#ifdef RLE_SUPPORTED
+JMESSAGE(JERR_RLE_BADERROR, "Bogus error code from RLE library")
+JMESSAGE(JERR_RLE_COLORSPACE, "RLE output must be grayscale or RGB")
+JMESSAGE(JERR_RLE_DIMENSIONS, "Image dimensions (%ux%u) too large for RLE")
+JMESSAGE(JERR_RLE_EMPTY, "Empty RLE file")
+JMESSAGE(JERR_RLE_EOF, "Premature EOF in RLE header")
+JMESSAGE(JERR_RLE_MEM, "Insufficient memory for RLE header")
+JMESSAGE(JERR_RLE_NOT, "Not an RLE file")
+JMESSAGE(JERR_RLE_TOOMANYCHANNELS, "Cannot handle %d output channels for RLE")
+JMESSAGE(JERR_RLE_UNSUPPORTED, "Cannot handle this RLE setup")
+JMESSAGE(JTRC_RLE, "%ux%u full-color RLE file")
+JMESSAGE(JTRC_RLE_FULLMAP, "%ux%u full-color RLE file with map of length %d")
+JMESSAGE(JTRC_RLE_GRAY, "%ux%u grayscale RLE file")
+JMESSAGE(JTRC_RLE_MAPGRAY, "%ux%u grayscale RLE file with map of length %d")
+JMESSAGE(JTRC_RLE_MAPPED, "%ux%u colormapped RLE file with map of length %d")
+#endif /* RLE_SUPPORTED */
+
+#ifdef TARGA_SUPPORTED
+JMESSAGE(JERR_TGA_BADCMAP, "Unsupported Targa colormap format")
+JMESSAGE(JERR_TGA_BADPARMS, "Invalid or unsupported Targa file")
+JMESSAGE(JERR_TGA_COLORSPACE, "Targa output must be grayscale or RGB")
+JMESSAGE(JTRC_TGA, "%ux%u RGB Targa image")
+JMESSAGE(JTRC_TGA_GRAY, "%ux%u grayscale Targa image")
+JMESSAGE(JTRC_TGA_MAPPED, "%ux%u colormapped Targa image")
+#else
+JMESSAGE(JERR_TGA_NOTCOMP, "Targa support was not compiled")
+#endif /* TARGA_SUPPORTED */
+
+JMESSAGE(JERR_BAD_CMAP_FILE,
+ "Color map file is invalid or of unsupported format")
+JMESSAGE(JERR_TOO_MANY_COLORS,
+ "Output file format cannot handle %d colormap entries")
+JMESSAGE(JERR_UNGETC_FAILED, "ungetc failed")
+#ifdef TARGA_SUPPORTED
+JMESSAGE(JERR_UNKNOWN_FORMAT,
+ "Unrecognized input file format --- perhaps you need -targa")
+#else
+JMESSAGE(JERR_UNKNOWN_FORMAT, "Unrecognized input file format")
+#endif
+JMESSAGE(JERR_UNSUPPORTED_FORMAT, "Unsupported output file format")
+
+#ifdef JMAKE_ENUM_LIST
+
+ JMSG_LASTADDONCODE
+} ADDON_MESSAGE_CODE;
+
+#undef JMAKE_ENUM_LIST
+#endif /* JMAKE_ENUM_LIST */
+
+/* Zap JMESSAGE macro so that future re-inclusions do nothing by default */
+#undef JMESSAGE
181 cdjpeg.c
@@ -0,0 +1,181 @@
+/*
+ * cdjpeg.c
+ *
+ * Copyright (C) 1991-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains common support routines used by the IJG application
+ * programs (cjpeg, djpeg, jpegtran).
+ */
+
+#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
+#include <ctype.h> /* to declare isupper(), tolower() */
+#ifdef NEED_SIGNAL_CATCHER
+#include <signal.h> /* to declare signal() */
+#endif
+#ifdef USE_SETMODE
+#include <fcntl.h> /* to declare setmode()'s parameter macros */
+/* If you have setmode() but not <io.h>, just delete this line: */
+#include <io.h> /* to declare setmode() */
+#endif
+
+
+/*
+ * Signal catcher to ensure that temporary files are removed before aborting.
+ * NB: for Amiga Manx C this is actually a global routine named _abort();
+ * we put "#define signal_catcher _abort" in jconfig.h. Talk about bogus...
+ */
+
+#ifdef NEED_SIGNAL_CATCHER
+
+static j_common_ptr sig_cinfo;
+
+void /* must be global for Manx C */
+signal_catcher (int signum)
+{
+ if (sig_cinfo != NULL) {
+ if (sig_cinfo->err != NULL) /* turn off trace output */
+ sig_cinfo->err->trace_level = 0;
+ jpeg_destroy(sig_cinfo); /* clean up memory allocation & temp files */
+ }
+ exit(EXIT_FAILURE);
+}
+
+
+GLOBAL(void)
+enable_signal_catcher (j_common_ptr cinfo)
+{
+ sig_cinfo = cinfo;
+#ifdef SIGINT /* not all systems have SIGINT */
+ signal(SIGINT, signal_catcher);
+#endif
+#ifdef SIGTERM /* not all systems have SIGTERM */
+ signal(SIGTERM, signal_catcher);
+#endif
+}
+
+#endif
+
+
+/*
+ * Optional progress monitor: display a percent-done figure on stderr.
+ */
+
+#ifdef PROGRESS_REPORT
+
+METHODDEF(void)
+progress_monitor (j_common_ptr cinfo)
+{
+ cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
+ int total_passes = prog->pub.total_passes + prog->total_extra_passes;
+ int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
+
+ if (percent_done != prog->percent_done) {
+ prog->percent_done = percent_done;
+ if (total_passes > 1) {
+ fprintf(stderr, "\rPass %d/%d: %3d%% ",
+ prog->pub.completed_passes + prog->completed_extra_passes + 1,
+ total_passes, percent_done);
+ } else {
+ fprintf(stderr, "\r %3d%% ", percent_done);
+ }
+ fflush(stderr);
+ }
+}
+
+
+GLOBAL(void)
+start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
+{
+ /* Enable progress display, unless trace output is on */
+ if (cinfo->err->trace_level == 0) {
+ progress->pub.progress_monitor = progress_monitor;
+ progress->completed_extra_passes = 0;
+ progress->total_extra_passes = 0;
+ progress->percent_done = -1;
+ cinfo->progress = &progress->pub;
+ }
+}
+
+
+GLOBAL(void)
+end_progress_monitor (j_common_ptr cinfo)
+{
+ /* Clear away progress display */
+ if (cinfo->err->trace_level == 0) {
+ fprintf(stderr, "\r \r");
+ fflush(stderr);
+ }
+}
+
+#endif
+
+
+/*
+ * Case-insensitive matching of possibly-abbreviated keyword switches.
+ * keyword is the constant keyword (must be lower case already),
+ * minchars is length of minimum legal abbreviation.
+ */
+
+GLOBAL(boolean)
+keymatch (char * arg, const char * keyword, int minchars)
+{
+ register int ca, ck;
+ register int nmatched = 0;
+
+ while ((ca = *arg++) != '\0') {
+ if ((ck = *keyword++) == '\0')
+ return FALSE; /* arg longer than keyword, no good */
+ if (isupper(ca)) /* force arg to lcase (assume ck is already) */
+ ca = tolower(ca);
+ if (ca != ck)
+ return FALSE; /* no good */
+ nmatched++; /* count matched characters */
+ }
+ /* reached end of argument; fail if it's too short for unique abbrev */
+ if (nmatched < minchars)
+ return FALSE;
+ return TRUE; /* A-OK */
+}
+
+
+/*
+ * Routines to establish binary I/O mode for stdin and stdout.
+ * Non-Unix systems often require some hacking to get out of text mode.
+ */
+
+GLOBAL(FILE *)
+read_stdin (void)
+{
+ FILE * input_file = stdin;
+
+#ifdef USE_SETMODE /* need to hack file mode? */
+ setmode(fileno(stdin), O_BINARY);
+#endif
+#ifdef USE_FDOPEN /* need to re-open in binary mode? */
+ if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
+ fprintf(stderr, "Cannot reopen stdin\n");
+ exit(EXIT_FAILURE);
+ }
+#endif
+ return input_file;
+}
+
+
+GLOBAL(FILE *)
+write_stdout (void)
+{
+ FILE * output_file = stdout;
+
+#ifdef USE_SETMODE /* need to hack file mode? */
+ setmode(fileno(stdout), O_BINARY);
+#endif
+#ifdef USE_FDOPEN /* need to re-open in binary mode? */
+ if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
+ fprintf(stderr, "Cannot reopen stdout\n");
+ exit(EXIT_FAILURE);
+ }
+#endif
+ return output_file;
+}
184 cdjpeg.h
@@ -0,0 +1,184 @@
+/*
+ * cdjpeg.h
+ *
+ * Copyright (C) 1994-1997, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains common declarations for the sample applications
+ * cjpeg and djpeg. It is NOT used by the core JPEG library.
+ */
+
+#define JPEG_CJPEG_DJPEG /* define proper options in jconfig.h */
+#define JPEG_INTERNAL_OPTIONS /* cjpeg.c,djpeg.c need to see xxx_SUPPORTED */
+#include "jinclude.h"
+#include "jpeglib.h"
+#include "jerror.h" /* get library error codes too */
+#include "cderror.h" /* get application-specific error codes */
+
+
+/*
+ * Object interface for cjpeg's source file decoding modules
+ */
+
+typedef struct cjpeg_source_struct * cjpeg_source_ptr;
+
+struct cjpeg_source_struct {
+ JMETHOD(void, start_input, (j_compress_ptr cinfo,
+ cjpeg_source_ptr sinfo));
+ JMETHOD(JDIMENSION, get_pixel_rows, (j_compress_ptr cinfo,
+ cjpeg_source_ptr sinfo));
+ JMETHOD(void, finish_input, (j_compress_ptr cinfo,
+ cjpeg_source_ptr sinfo));
+
+ FILE *input_file;
+
+ JSAMPARRAY buffer;
+ JDIMENSION buffer_height;
+};
+
+
+/*
+ * Object interface for djpeg's output file encoding modules
+ */
+
+typedef struct djpeg_dest_struct * djpeg_dest_ptr;
+
+struct djpeg_dest_struct {
+ /* start_output is called after jpeg_start_decompress finishes.
+ * The color map will be ready at this time, if one is needed.
+ */
+ JMETHOD(void, start_output, (j_decompress_ptr cinfo,
+ djpeg_dest_ptr dinfo));
+ /* Emit the specified number of pixel rows from the buffer. */
+ JMETHOD(void, put_pixel_rows, (j_decompress_ptr cinfo,
+ djpeg_dest_ptr dinfo,
+ JDIMENSION rows_supplied));
+ /* Finish up at the end of the image. */
+ JMETHOD(void, finish_output, (j_decompress_ptr cinfo,
+ djpeg_dest_ptr dinfo));
+
+ /* Target file spec; filled in by djpeg.c after object is created. */
+ FILE * output_file;
+
+ /* Output pixel-row buffer. Created by module init or start_output.
+ * Width is cinfo->output_width * cinfo->output_components;
+ * height is buffer_height.
+ */
+ JSAMPARRAY buffer;
+ JDIMENSION buffer_height;
+};
+
+
+/*
+ * cjpeg/djpeg may need to perform extra passes to convert to or from
+ * the source/destination file format. The JPEG library does not know
+ * about these passes, but we'd like them to be counted by the progress
+ * monitor. We use an expanded progress monitor object to hold the
+ * additional pass count.
+ */
+
+struct cdjpeg_progress_mgr {
+ struct jpeg_progress_mgr pub; /* fields known to JPEG library */
+ int completed_extra_passes; /* extra passes completed */
+ int total_extra_passes; /* total extra */
+ /* last printed percentage stored here to avoid multiple printouts */
+ int percent_done;
+};
+
+typedef struct cdjpeg_progress_mgr * cd_progress_ptr;
+
+
+/* Short forms of external names for systems with brain-damaged linkers. */
+
+#ifdef NEED_SHORT_EXTERNAL_NAMES
+#define jinit_read_bmp jIRdBMP
+#define jinit_write_bmp jIWrBMP
+#define jinit_read_gif jIRdGIF
+#define jinit_write_gif jIWrGIF
+#define jinit_read_ppm jIRdPPM
+#define jinit_write_ppm jIWrPPM
+#define jinit_read_rle jIRdRLE
+#define jinit_write_rle jIWrRLE
+#define jinit_read_targa jIRdTarga
+#define jinit_write_targa jIWrTarga
+#define read_quant_tables RdQTables
+#define read_scan_script RdScnScript
+#define set_quant_slots SetQSlots
+#define set_sample_factors SetSFacts
+#define read_color_map RdCMap
+#define enable_signal_catcher EnSigCatcher
+#define start_progress_monitor StProgMon
+#define end_progress_monitor EnProgMon
+#define read_stdin RdStdin
+#define write_stdout WrStdout
+#endif /* NEED_SHORT_EXTERNAL_NAMES */
+
+/* Module selection routines for I/O modules. */
+
+EXTERN(cjpeg_source_ptr) jinit_read_bmp JPP((j_compress_ptr cinfo));
+EXTERN(djpeg_dest_ptr) jinit_write_bmp JPP((j_decompress_ptr cinfo,
+ boolean is_os2));
+EXTERN(cjpeg_source_ptr) jinit_read_gif JPP((j_compress_ptr cinfo));
+EXTERN(djpeg_dest_ptr) jinit_write_gif JPP((j_decompress_ptr cinfo));
+EXTERN(cjpeg_source_ptr) jinit_read_ppm JPP((j_compress_ptr cinfo));
+EXTERN(djpeg_dest_ptr) jinit_write_ppm JPP((j_decompress_ptr cinfo));
+EXTERN(cjpeg_source_ptr) jinit_read_rle JPP((j_compress_ptr cinfo));
+EXTERN(djpeg_dest_ptr) jinit_write_rle JPP((j_decompress_ptr cinfo));
+EXTERN(cjpeg_source_ptr) jinit_read_targa JPP((j_compress_ptr cinfo));
+EXTERN(djpeg_dest_ptr) jinit_write_targa JPP((j_decompress_ptr cinfo));
+
+/* cjpeg support routines (in rdswitch.c) */
+
+EXTERN(boolean) read_quant_tables JPP((j_compress_ptr cinfo, char * filename,
+ int scale_factor, boolean force_baseline));
+EXTERN(boolean) read_scan_script JPP((j_compress_ptr cinfo, char * filename));
+EXTERN(boolean) set_quant_slots JPP((j_compress_ptr cinfo, char *arg));
+EXTERN(boolean) set_sample_factors JPP((j_compress_ptr cinfo, char *arg));
+
+/* djpeg support routines (in rdcolmap.c) */
+
+EXTERN(void) read_color_map JPP((j_decompress_ptr cinfo, FILE * infile));
+
+/* common support routines (in cdjpeg.c) */
+
+EXTERN(void) enable_signal_catcher JPP((j_common_ptr cinfo));
+EXTERN(void) start_progress_monitor JPP((j_common_ptr cinfo,
+ cd_progress_ptr progress));
+EXTERN(void) end_progress_monitor JPP((j_common_ptr cinfo));
+EXTERN(boolean) keymatch JPP((char * arg, const char * keyword, int minchars));
+EXTERN(FILE *) read_stdin JPP((void));
+EXTERN(FILE *) write_stdout JPP((void));
+
+/* miscellaneous useful macros */
+
+#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
+#define READ_BINARY "r"
+#define WRITE_BINARY "w"
+#else
+#ifdef VMS /* VMS is very nonstandard */
+#define READ_BINARY "rb", "ctx=stm"
+#define WRITE_BINARY "wb", "ctx=stm"
+#else /* standard ANSI-compliant case */
+#define READ_BINARY "rb"
+#define WRITE_BINARY "wb"
+#endif
+#endif
+
+#ifndef EXIT_FAILURE /* define exit() codes if not provided */
+#define EXIT_FAILURE 1
+#endif
+#ifndef EXIT_SUCCESS
+#ifdef VMS
+#define EXIT_SUCCESS 1 /* VMS is very nonstandard */
+#else
+#define EXIT_SUCCESS 0
+#endif
+#endif
+#ifndef EXIT_WARNING
+#ifdef VMS
+#define EXIT_WARNING 1 /* VMS is very nonstandard */
+#else
+#define EXIT_WARNING 2
+#endif
+#endif
217 change.log
@@ -0,0 +1,217 @@
+CHANGE LOG for Independent JPEG Group's JPEG software
+
+
+Version 6b 27-Mar-1998
+-----------------------
+
+jpegtran has new features for lossless image transformations (rotation
+and flipping) as well as "lossless" reduction to grayscale.
+
+jpegtran now copies comments by default; it has a -copy switch to enable
+copying all APPn blocks as well, or to suppress comments. (Formerly it
+always suppressed comments and APPn blocks.) jpegtran now also preserves
+JFIF version and resolution information.
+
+New decompressor library feature: COM and APPn markers found in the input
+file can be saved in memory for later use by the application. (Before,
+you had to code this up yourself with a custom marker processor.)
+
+There is an unused field "void * client_data" now in compress and decompress
+parameter structs; this may be useful in some applications.
+
+JFIF version number information is now saved by the decoder and accepted by
+the encoder. jpegtran uses this to copy the source file's version number,
+to ensure "jpegtran -copy all" won't create bogus files that contain JFXX
+extensions but claim to be version 1.01. Applications that generate their
+own JFXX extension markers also (finally) have a supported way to cause the
+encoder to emit JFIF version number 1.02.
+
+djpeg's trace mode reports JFIF 1.02 thumbnail images as such, rather
+than as unknown APP0 markers.
+
+In -verbose mode, djpeg and rdjpgcom will try to print the contents of
+APP12 markers as text. Some digital cameras store useful text information
+in APP12 markers.
+
+Handling of truncated data streams is more robust: blocks beyond the one in
+which the error occurs will be output as uniform gray, or left unchanged
+if decoding a progressive JPEG. The appearance no longer depends on the
+Huffman tables being used.
+
+Huffman tables are checked for validity much more carefully than before.
+
+To avoid the Unisys LZW patent, djpeg's GIF output capability has been
+changed to produce "uncompressed GIFs", and cjpeg's GIF input capability
+has been removed altogether. We're not happy about it either, but there
+seems to be no good alternative.
+
+The configure script now supports building libjpeg as a shared library
+on many flavors of Unix (all the ones that GNU libtool knows how to
+build shared libraries for). Use "./configure --enable-shared" to
+try this out.
+
+New jconfig file and makefiles for Microsoft Visual C++ and Developer Studio.
+Also, a jconfig file and a build script for Metrowerks CodeWarrior
+on Apple Macintosh. makefile.dj has been updated for DJGPP v2, and there
+are miscellaneous other minor improvements in the makefiles.
+
+jmemmac.c now knows how to create temporary files following Mac System 7
+conventions.
+
+djpeg's -map switch is now able to read raw-format PPM files reliably.
+
+cjpeg -progressive -restart no longer generates any unnecessary DRI markers.
+
+Multiple calls to jpeg_simple_progression for a single JPEG object
+no longer leak memory.
+
+
+Version 6a 7-Feb-96
+--------------------
+
+Library initialization sequence modified to detect version mismatches
+and struct field packing mismatches between library and calling application.
+This change requires applications to be recompiled, but does not require
+any application source code change.
+
+All routine declarations changed to the style "GLOBAL(type) name ...",
+that is, GLOBAL, LOCAL, METHODDEF, EXTERN are now macros taking the
+routine's return type as an argument. This makes it possible to add
+Microsoft-style linkage keywords to all the routines by changing just
+these macros. Note that any application code that was using these macros
+will have to be changed.
+
+DCT coefficient quantization tables are now stored in normal array order
+rather than zigzag order. Application code that calls jpeg_add_quant_table,
+or otherwise manipulates quantization tables directly, will need to be
+changed. If you need to make such code work with either older or newer
+versions of the library, a test like "#if JPEG_LIB_VERSION >= 61" is
+recommended.
+
+djpeg's trace capability now dumps DQT tables in natural order, not zigzag
+order. This allows the trace output to be made into a "-qtables" file
+more easily.
+
+New system-dependent memory manager module for use on Apple Macintosh.
+
+Fix bug in cjpeg's -smooth option: last one or two scanlines would be
+duplicates of the prior line unless the image height mod 16 was 1 or 2.
+
+Repair minor problems in VMS, BCC, MC6 makefiles.
+
+New configure script based on latest GNU Autoconf.
+
+Correct the list of include files needed by MetroWerks C for ccommand().
+
+Numerous small documentation updates.
+
+
+Version 6 2-Aug-95
+-------------------
+
+Progressive JPEG support: library can read and write full progressive JPEG
+files. A "buffered image" mode supports incremental decoding for on-the-fly
+display of progressive images. Simply recompiling an existing IJG-v5-based
+decoder with v6 should allow it to read progressive files, though of course
+without any special progressive display.
+
+New "jpegtran" application performs lossless transcoding between different
+JPEG formats; primarily, it can be used to convert baseline to progressive
+JPEG and vice versa. In support of jpegtran, the library now allows lossless
+reading and writing of JPEG files as DCT coefficient arrays. This ability
+may be of use in other applications.
+
+Notes for programmers:
+* We changed jpeg_start_decompress() to be able to suspend; this makes all
+decoding modes available to suspending-input applications. However,
+existing applications that use suspending input will need to be changed
+to check the return value from jpeg_start_decompress(). You don't need to
+do anything if you don't use a suspending data source.
+* We changed the interface to the virtual array routines: access_virt_array
+routines now take a count of the number of rows to access this time. The
+last parameter to request_virt_array routines is now interpreted as the
+maximum number of rows that may be accessed at once, but not necessarily
+the height of every access.
+
+
+Version 5b 15-Mar-95
+---------------------
+
+Correct bugs with grayscale images having v_samp_factor > 1.
+
+jpeg_write_raw_data() now supports output suspension.
+
+Correct bugs in "configure" script for case of compiling in
+a directory other than the one containing the source files.
+
+Repair bug in jquant1.c: sometimes didn't use as many colors as it could.
+
+Borland C makefile and jconfig file work under either MS-DOS or OS/2.
+
+Miscellaneous improvements to documentation.
+
+
+Version 5a 7-Dec-94
+--------------------
+
+Changed color conversion roundoff behavior so that grayscale values are
+represented exactly. (This causes test image files to change.)
+
+Make ordered dither use 16x16 instead of 4x4 pattern for a small quality
+improvement.
+
+New configure script based on latest GNU Autoconf.
+Fix configure script to handle CFLAGS correctly.
+Rename *.auto files to *.cfg, so that configure script still works if
+file names have been truncated for DOS.
+
+Fix bug in rdbmp.c: didn't allow for extra data between header and image.
+
+Modify rdppm.c/wrppm.c to handle 2-byte raw PPM/PGM formats for 12-bit data.
+
+Fix several bugs in rdrle.c.
+
+NEED_SHORT_EXTERNAL_NAMES option was broken.
+
+Revise jerror.h/jerror.c for more flexibility in message table.
+
+Repair oversight in jmemname.c NO_MKTEMP case: file could be there
+but unreadable.
+
+
+Version 5 24-Sep-94
+--------------------
+
+Version 5 represents a nearly complete redesign and rewrite of the IJG
+software. Major user-visible changes include:
+ * Automatic configuration simplifies installation for most Unix systems.
+ * A range of speed vs. image quality tradeoffs are supported.
+ This includes resizing of an image during decompression: scaling down
+ by a factor of 1/2, 1/4, or 1/8 is handled very efficiently.
+ * New programs rdjpgcom and wrjpgcom allow insertion and extraction
+ of text comments in a JPEG file.
+
+The application programmer's interface to the library has changed completely.
+Notable improvements include:
+ * We have eliminated the use of callback routines for handling the
+ uncompressed image data. The application now sees the library as a
+ set of routines that it calls to read or write image data on a
+ scanline-by-scanline basis.
+ * The application image data is represented in a conventional interleaved-
+ pixel format, rather than as a separate array for each color channel.
+ This can save a copying step in many programs.
+ * The handling of compressed data has been cleaned up: the application can
+ supply routines to source or sink the compressed data. It is possible to
+ suspend processing on source/sink buffer overrun, although this is not
+ supported in all operating modes.
+ * All static state has been eliminated from the library, so that multiple
+ instances of compression or decompression can be active concurrently.
+ * JPEG abbreviated datastream formats are supported, ie, quantization and
+ Huffman tables can be stored separately from the image data.
+ * And not only that, but the documentation of the library has improved
+ considerably!
+
+
+The last widely used release before the version 5 rewrite was version 4A of
+18-Feb-93. Change logs before that point have been discarded, since they
+are not of much interest after the rewrite.
292 cjpeg.1
@@ -0,0 +1,292 @@
+.TH CJPEG 1 "20 March 1998"
+.SH NAME
+cjpeg \- compress an image file to a JPEG file
+.SH SYNOPSIS
+.B cjpeg
+[
+.I options
+]
+[
+.I filename
+]
+.LP
+.SH DESCRIPTION
+.LP
+.B cjpeg
+compresses the named image file, or the standard input if no file is
+named, and produces a JPEG/JFIF file on the standard output.
+The currently supported input file formats are: PPM (PBMPLUS color
+format), PGM (PBMPLUS gray-scale format), BMP, Targa, and RLE (Utah Raster
+Toolkit format). (RLE is supported only if the URT library is available.)
+.SH OPTIONS
+All switch names may be abbreviated; for example,
+.B \-grayscale
+may be written
+.B \-gray
+or
+.BR \-gr .
+Most of the "basic" switches can be abbreviated to as little as one letter.
+Upper and lower case are equivalent (thus
+.B \-BMP
+is the same as
+.BR \-bmp ).
+British spellings are also accepted (e.g.,
+.BR \-greyscale ),
+though for brevity these are not mentioned below.
+.PP
+The basic switches are:
+.TP
+.BI \-quality " N"
+Scale quantization tables to adjust image quality. Quality is 0 (worst) to
+100 (best); default is 75. (See below for more info.)
+.TP
+.B \-grayscale
+Create monochrome JPEG file from color input. Be sure to use this switch when
+compressing a grayscale BMP file, because
+.B cjpeg
+isn't bright enough to notice whether a BMP file uses only shades of gray.
+By saying
+.BR \-grayscale ,
+you'll get a smaller JPEG file that takes less time to process.
+.TP
+.B \-optimize
+Perform optimization of entropy encoding parameters. Without this, default
+encoding parameters are used.
+.B \-optimize
+usually makes the JPEG file a little smaller, but
+.B cjpeg
+runs somewhat slower and needs much more memory. Image quality and speed of
+decompression are unaffected by
+.BR \-optimize .
+.TP
+.B \-progressive
+Create progressive JPEG file (see below).
+.TP
+.B \-targa
+Input file is Targa format. Targa files that contain an "identification"
+field will not be automatically recognized by
+.BR cjpeg ;
+for such files you must specify
+.B \-targa
+to make
+.B cjpeg
+treat the input as Targa format.
+For most Targa files, you won't need this switch.
+.PP
+The
+.B \-quality
+switch lets you trade off compressed file size against quality of the
+reconstructed image: the higher the quality setting, the larger the JPEG file,
+and the closer the output image will be to the original input. Normally you
+want to use the lowest quality setting (smallest file) that decompresses into
+something visually indistinguishable from the original image. For this
+purpose the quality setting should be between 50 and 95; the default of 75 is
+often about right. If you see defects at
+.B \-quality
+75, then go up 5 or 10 counts at a time until you are happy with the output
+image. (The optimal setting will vary from one image to another.)
+.PP
+.B \-quality
+100 will generate a quantization table of all 1's, minimizing loss in the
+quantization step (but there is still information loss in subsampling, as well
+as roundoff error). This setting is mainly of interest for experimental
+purposes. Quality values above about 95 are
+.B not
+recommended for normal use; the compressed file size goes up dramatically for
+hardly any gain in output image quality.
+.PP
+In the other direction, quality values below 50 will produce very small files
+of low image quality. Settings around 5 to 10 might be useful in preparing an
+index of a large image library, for example. Try
+.B \-quality
+2 (or so) for some amusing Cubist effects. (Note: quality
+values below about 25 generate 2-byte quantization tables, which are
+considered optional in the JPEG standard.
+.B cjpeg
+emits a warning message when you give such a quality value, because some
+other JPEG programs may be unable to decode the resulting file. Use
+.B \-baseline
+if you need to ensure compatibility at low quality values.)
+.PP
+The
+.B \-progressive
+switch creates a "progressive JPEG" file. In this type of JPEG file, the data
+is stored in multiple scans of increasing quality. If the file is being
+transmitted over a slow communications link, the decoder can use the first
+scan to display a low-quality image very quickly, and can then improve the
+display with each subsequent scan. The final image is exactly equivalent to a
+standard JPEG file of the same quality setting, and the total file size is
+about the same --- often a little smaller.
+.B Caution:
+progressive JPEG is not yet widely implemented, so many decoders will be
+unable to view a progressive JPEG file at all.
+.PP
+Switches for advanced users:
+.TP
+.B \-dct int
+Use integer DCT method (default).
+.TP
+.B \-dct fast
+Use fast integer DCT (less accurate).
+.TP
+.B \-dct float
+Use floating-point DCT method.
+The float method is very slightly more accurate than the int method, but is
+much slower unless your machine has very fast floating-point hardware. Also
+note that results of the floating-point method may vary slightly across
+machines, while the integer methods should give the same results everywhere.
+The fast integer method is much less accurate than the other two.
+.TP
+.BI \-restart " N"
+Emit a JPEG restart marker every N MCU rows, or every N MCU blocks if "B" is
+attached to the number.
+.B \-restart 0
+(the default) means no restart markers.
+.TP
+.BI \-smooth " N"
+Smooth the input image to eliminate dithering noise. N, ranging from 1 to
+100, indicates the strength of smoothing. 0 (the default) means no smoothing.
+.TP
+.BI \-maxmemory " N"
+Set limit for amount of memory to use in processing large images. Value is
+in thousands of bytes, or millions of bytes if "M" is attached to the
+number. For example,
+.B \-max 4m
+selects 4000000 bytes. If more space is needed, temporary files will be used.
+.TP
+.BI \-outfile " name"
+Send output image to the named file, not to standard output.
+.TP
+.B \-verbose
+Enable debug printout. More
+.BR \-v 's
+give more output. Also, version information is printed at startup.
+.TP
+.B \-debug
+Same as
+.BR \-verbose .
+.PP
+The
+.B \-restart
+option inserts extra markers that allow a JPEG decoder to resynchronize after
+a transmission error. Without restart markers, any damage to a compressed
+file will usually ruin the image from the point of the error to the end of the
+image; with restart markers, the damage is usually confined to the portion of
+the image up to the next restart marker. Of course, the restart markers
+occupy extra space. We recommend
+.B \-restart 1
+for images that will be transmitted across unreliable networks such as Usenet.
+.PP
+The
+.B \-smooth
+option filters the input to eliminate fine-scale noise. This is often useful
+when converting dithered images to JPEG: a moderate smoothing factor of 10 to
+50 gets rid of dithering patterns in the input file, resulting in a smaller
+JPEG file and a better-looking image. Too large a smoothing factor will
+visibly blur the image, however.
+.PP
+Switches for wizards:
+.TP
+.B \-baseline
+Force baseline-compatible quantization tables to be generated. This clamps
+quantization values to 8 bits even at low quality settings. (This switch is
+poorly named, since it does not ensure that the output is actually baseline
+JPEG. For example, you can use
+.B \-baseline
+and
+.B \-progressive
+together.)
+.TP
+.BI \-qtables " file"
+Use the quantization tables given in the specified text file.
+.TP
+.BI \-qslots " N[,...]"
+Select which quantization table to use for each color component.
+.TP
+.BI \-sample " HxV[,...]"
+Set JPEG sampling factors for each color component.
+.TP
+.BI \-scans " file"
+Use the scan script given in the specified text file.
+.PP
+The "wizard" switches are intended for experimentation with JPEG. If you
+don't know what you are doing, \fBdon't use them\fR. These switches are
+documented further in the file wizard.doc.
+.SH EXAMPLES
+.LP
+This example compresses the PPM file foo.ppm with a quality factor of
+60 and saves the output as foo.jpg:
+.IP
+.B cjpeg \-quality
+.I 60 foo.ppm
+.B >
+.I foo.jpg
+.SH HINTS
+Color GIF files are not the ideal input for JPEG; JPEG is really intended for
+compressing full-color (24-bit) images. In particular, don't try to convert
+cartoons, line drawings, and other images that have only a few distinct
+colors. GIF works great on these, JPEG does not. If you want to convert a
+GIF to JPEG, you should experiment with
+.BR cjpeg 's
+.B \-quality
+and
+.B \-smooth
+options to get a satisfactory conversion.
+.B \-smooth 10
+or so is often helpful.
+.PP
+Avoid running an image through a series of JPEG compression/decompression
+cycles. Image quality loss will accumulate; after ten or so cycles the image
+may be noticeably worse than it was after one cycle. It's best to use a
+lossless format while manipulating an image, then convert to JPEG format when
+you are ready to file the image away.
+.PP
+The
+.B \-optimize
+option to
+.B cjpeg
+is worth using when you are making a "final" version for posting or archiving.
+It's also a win when you are using low quality settings to make very small
+JPEG files; the percentage improvement is often a lot more than it is on
+larger files. (At present,
+.B \-optimize
+mode is always selected when generating progressive JPEG files.)
+.SH ENVIRONMENT
+.TP
+.B JPEGMEM
+If this environment variable is set, its value is the default memory limit.
+The value is specified as described for the
+.B \-maxmemory
+switch.
+.B JPEGMEM
+overrides the default value specified when the program was compiled, and
+itself is overridden by an explicit
+.BR \-maxmemory .
+.SH SEE ALSO
+.BR djpeg (1),
+.BR jpegtran (1),
+.BR rdjpgcom (1),
+.BR wrjpgcom (1)
+.br
+.BR ppm (5),
+.BR pgm (5)
+.br
+Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
+Communications of the ACM, April 1991 (vol. 34, no. 4), pp. 30-44.
+.SH AUTHOR
+Independent JPEG Group
+.SH BUGS
+Arithmetic coding is not supported for legal reasons.
+.PP
+GIF input files are no longer supported, to avoid the Unisys LZW patent.
+Use a Unisys-licensed program if you need to read a GIF file. (Conversion
+of GIF files to JPEG is usually a bad idea anyway.)
+.PP
+Not all variants of BMP and Targa file formats are supported.
+.PP
+The
+.B \-targa
+switch is not a bug, it's a feature. (It would be a bug if the Targa format
+designers had not been clueless.)
+.PP
+Still not as fast as we'd like.
606 cjpeg.c
@@ -0,0 +1,606 @@
+/*
+ * cjpeg.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * This file is part of the Independent JPEG Group's software.
+ * For conditions of distribution and use, see the accompanying README file.
+ *
+ * This file contains a command-line user interface for the JPEG compressor.
+ * It should work on any system with Unix- or MS-DOS-style command lines.
+ *
+ * Two different command line styles are permitted, depending on the
+ * compile-time switch TWO_FILE_COMMANDLINE:
+ * cjpeg [options] inputfile outputfile
+ * cjpeg [options] [inputfile]
+ * In the second style, output is always to standard output, which you'd
+ * normally redirect to a file or pipe to some other program. Input is
+ * either from a named file or from standard input (typically redirected).
+ * The second style is convenient on Unix but is unhelpful on systems that
+ * don't support pipes. Also, you MUST use the first style if your system
+ * doesn't do binary I/O to stdin/stdout.
+ * To simplify script writing, the "-outfile" switch is provided. The syntax
+ * cjpeg [options] -outfile outputfile inputfile
+ * works regardless of which command line style is used.
+ */
+
+#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
+#include "jversion.h" /* for version message */
+
+#ifdef USE_CCOMMAND /* command-line reader for Macintosh */
+#ifdef __MWERKS__
+#include <SIOUX.h> /* Metrowerks needs this */
+#include <console.h> /* ... and this */
+#endif
+#ifdef THINK_C
+#include <console.h> /* Think declares it here */
+#endif
+#endif
+
+
+/* Create the add-on message string table. */
+
+#define JMESSAGE(code,string) string ,
+
+static const char * const cdjpeg_message_table[] = {
+#include "cderror.h"
+ NULL
+};
+
+
+/*
+ * This routine determines what format the input file is,
+ * and selects the appropriate input-reading module.
+ *
+ * To determine which family of input formats the file belongs to,
+ * we may look only at the first byte of the file, since C does not
+ * guarantee that more than one character can be pushed back with ungetc.
+ * Looking at additional bytes would require one of these approaches:
+ * 1) assume we can fseek() the input file (fails for piped input);
+ * 2) assume we can push back more than one character (works in
+ * some C implementations, but unportable);
+ * 3) provide our own buffering (breaks input readers that want to use
+ * stdio directly, such as the RLE library);
+ * or 4) don't put back the data, and modify the input_init methods to assume
+ * they start reading after the start of file (also breaks RLE library).
+ * #1 is attractive for MS-DOS but is untenable on Unix.
+ *
+ * The most portable solution for file types that can't be identified by their
+ * first byte is to make the user tell us what they are. This is also the
+ * only approach for "raw" file types that contain only arbitrary values.
+ * We presently apply this method for Targa files. Most of the time Targa
+ * files start with 0x00, so we recognize that case. Potentially, however,
+ * a Targa file could start with any byte value (byte 0 is the length of the
+ * seldom-used ID field), so we provide a switch to force Targa input mode.
+ */
+
+static boolean is_targa; /* records user -targa switch */
+
+
+LOCAL(cjpeg_source_ptr)
+select_file_type (j_compress_ptr cinfo, FILE * infile)
+{
+ int c;
+
+ if (is_targa) {
+#ifdef TARGA_SUPPORTED
+ return jinit_read_targa(cinfo);
+#else
+ ERREXIT(cinfo, JERR_TGA_NOTCOMP);
+#endif
+ }
+
+ if ((c = getc(infile)) == EOF)
+ ERREXIT(cinfo, JERR_INPUT_EMPTY);
+ if (ungetc(c, infile) == EOF)
+ ERREXIT(cinfo, JERR_UNGETC_FAILED);
+
+ switch (c) {
+#ifdef BMP_SUPPORTED
+ case 'B':
+ return jinit_read_bmp(cinfo);
+#endif
+#ifdef GIF_SUPPORTED
+ case 'G':
+ return jinit_read_gif(cinfo);
+#endif
+#ifdef PPM_SUPPORTED
+ case 'P':
+ return jinit_read_ppm(cinfo);
+#endif
+#ifdef RLE_SUPPORTED
+ case 'R':
+ return jinit_read_rle(cinfo);
+#endif
+#ifdef TARGA_SUPPORTED
+ case 0x00:
+ return jinit_read_targa(cinfo);
+#endif
+ default:
+ ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
+ break;
+ }
+
+ return NULL; /* suppress compiler warnings */
+}
+
+
+/*
+ * Argument-parsing code.
+ * The switch parser is designed to be useful with DOS-style command line
+ * syntax, ie, intermixed switches and file names, where only the switches
+ * to the left of a given file name affect processing of that file.
+ * The main program in this file doesn't actually use this capability...
+ */
+
+
+static const char * progname; /* program name for error messages */
+static char * outfilename; /* for -outfile switch */
+
+
+LOCAL(void)
+usage (void)
+/* complain about bad command line */
+{
+ fprintf(stderr, "usage: %s [switches] ", progname);
+#ifdef TWO_FILE_COMMANDLINE
+ fprintf(stderr, "inputfile outputfile\n");
+#else
+ fprintf(stderr, "[inputfile]\n");
+#endif
+
+ fprintf(stderr, "Switches (names may be abbreviated):\n");
+ fprintf(stderr, " -quality N Compression quality (0..100; 5-95 is useful range)\n");
+ fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
+#ifdef ENTROPY_OPT_SUPPORTED
+ fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
+#endif
+#ifdef C_PROGRESSIVE_SUPPORTED
+ fprintf(stderr, " -progressive Create progressive JPEG file\n");
+#endif
+#ifdef TARGA_SUPPORTED
+ fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
+#endif
+ fprintf(stderr, "Switches for advanced users:\n");
+#ifdef DCT_ISLOW_SUPPORTED
+ fprintf(stderr, " -dct int Use integer DCT method%s\n",
+ (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+ fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
+ (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+ fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
+ (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
+#endif
+ fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
+#ifdef INPUT_SMOOTHING_SUPPORTED
+ fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
+#endif
+ fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
+ fprintf(stderr, " -outfile name Specify name for output file\n");
+ fprintf(stderr, " -verbose or -debug Emit debug output\n");
+ fprintf(stderr, "Switches for wizards:\n");
+#ifdef C_ARITH_CODING_SUPPORTED
+ fprintf(stderr, " -arithmetic Use arithmetic coding\n");
+#endif
+ fprintf(stderr, " -baseline Force baseline quantization tables\n");
+ fprintf(stderr, " -qtables file Use quantization tables given in file\n");
+ fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
+ fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
+#endif
+ exit(EXIT_FAILURE);
+}
+
+
+LOCAL(int)
+parse_switches (j_compress_ptr cinfo, int argc, char **argv,
+ int last_file_arg_seen, boolean for_real)
+/* Parse optional switches.
+ * Returns argv[] index of first file-name argument (== argc if none).
+ * Any file names with indexes <= last_file_arg_seen are ignored;
+ * they have presumably been processed in a previous iteration.
+ * (Pass 0 for last_file_arg_seen on the first or only iteration.)
+ * for_real is FALSE on the first (dummy) pass; we may skip any expensive
+ * processing.
+ */
+{
+ int argn;
+ char * arg;
+ int quality; /* -quality parameter */
+ int q_scale_factor; /* scaling percentage for -qtables */
+ boolean force_baseline;
+ boolean simple_progressive;
+ char * qtablefile = NULL; /* saves -qtables filename if any */
+ char * qslotsarg = NULL; /* saves -qslots parm if any */
+ char * samplearg = NULL; /* saves -sample parm if any */
+ char * scansarg = NULL; /* saves -scans parm if any */
+
+ /* Set up default JPEG parameters. */
+ /* Note that default -quality level need not, and does not,
+ * match the default scaling for an explicit -qtables argument.
+ */
+ quality = 75; /* default -quality value */
+ q_scale_factor = 100; /* default to no scaling for -qtables */
+ force_baseline = FALSE; /* by default, allow 16-bit quantizers */
+ simple_progressive = FALSE;
+ is_targa = FALSE;
+ outfilename = NULL;
+ cinfo->err->trace_level = 0;
+
+ /* Scan command line options, adjust parameters */
+
+ for (argn = 1; argn < argc; argn++) {
+ arg = argv[argn];
+ if (*arg != '-') {
+ /* Not a switch, must be a file name argument */
+ if (argn <= last_file_arg_seen) {
+ outfilename = NULL; /* -outfile applies to just one input file */
+ continue; /* ignore this name if previously processed */
+ }
+ break; /* else done parsing switches */
+ }
+ arg++; /* advance past switch marker character */
+
+ if (keymatch(arg, "arithmetic", 1)) {
+ /* Use arithmetic coding. */
+#ifdef C_ARITH_CODING_SUPPORTED
+ cinfo->arith_code = TRUE;
+#else
+ fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "baseline", 1)) {
+ /* Force baseline-compatible output (8-bit quantizer values). */
+ force_baseline = TRUE;
+
+ } else if (keymatch(arg, "dct", 2)) {
+ /* Select DCT algorithm. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (keymatch(argv[argn], "int", 1)) {
+ cinfo->dct_method = JDCT_ISLOW;
+ } else if (keymatch(argv[argn], "fast", 2)) {
+ cinfo->dct_method = JDCT_IFAST;
+ } else if (keymatch(argv[argn], "float", 2)) {
+ cinfo->dct_method = JDCT_FLOAT;
+ } else
+ usage();
+
+ } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
+ /* Enable debug printouts. */
+ /* On first -d, print version identification */
+ static boolean printed_version = FALSE;
+
+ if (! printed_version) {
+ fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
+ JVERSION, JCOPYRIGHT);
+ printed_version = TRUE;
+ }
+ cinfo->err->trace_level++;
+
+ } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
+ /* Force a monochrome JPEG file to be generated. */
+ jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
+
+ } else if (keymatch(arg, "maxmemory", 3)) {
+ /* Maximum memory in Kb (or Mb with 'm'). */
+ long lval;
+ char ch = 'x';
+
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
+ usage();
+ if (ch == 'm' || ch == 'M')
+ lval *= 1000L;
+ cinfo->mem->max_memory_to_use = lval * 1000L;
+
+ } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
+ /* Enable entropy parm optimization. */
+#ifdef ENTROPY_OPT_SUPPORTED
+ cinfo->optimize_coding = TRUE;
+#else
+ fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "outfile", 4)) {
+ /* Set output file name. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ outfilename = argv[argn]; /* save it away for later use */
+
+ } else if (keymatch(arg, "progressive", 1)) {
+ /* Select simple progressive mode. */
+#ifdef C_PROGRESSIVE_SUPPORTED
+ simple_progressive = TRUE;
+ /* We must postpone execution until num_components is known. */
+#else
+ fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "quality", 1)) {
+ /* Quality factor (quantization table scaling factor). */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%d", &quality) != 1)
+ usage();
+ /* Change scale factor in case -qtables is present. */
+ q_scale_factor = jpeg_quality_scaling(quality);
+
+ } else if (keymatch(arg, "qslots", 2)) {
+ /* Quantization table slot numbers. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ qslotsarg = argv[argn];
+ /* Must delay setting qslots until after we have processed any
+ * colorspace-determining switches, since jpeg_set_colorspace sets
+ * default quant table numbers.
+ */
+
+ } else if (keymatch(arg, "qtables", 2)) {
+ /* Quantization tables fetched from file. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ qtablefile = argv[argn];
+ /* We postpone actually reading the file in case -quality comes later. */
+
+ } else if (keymatch(arg, "restart", 1)) {
+ /* Restart interval in MCU rows (or in MCUs with 'b'). */
+ long lval;
+ char ch = 'x';
+
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
+ usage();
+ if (lval < 0 || lval > 65535L)
+ usage();
+ if (ch == 'b' || ch == 'B') {
+ cinfo->restart_interval = (unsigned int) lval;
+ cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
+ } else {
+ cinfo->restart_in_rows = (int) lval;
+ /* restart_interval will be computed during startup */
+ }
+
+ } else if (keymatch(arg, "sample", 2)) {
+ /* Set sampling factors. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ samplearg = argv[argn];
+ /* Must delay setting sample factors until after we have processed any
+ * colorspace-determining switches, since jpeg_set_colorspace sets
+ * default sampling factors.
+ */
+
+ } else if (keymatch(arg, "scans", 2)) {
+ /* Set scan script. */
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ scansarg = argv[argn];
+ /* We must postpone reading the file in case -progressive appears. */
+#else
+ fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "smooth", 2)) {
+ /* Set input smoothing factor. */
+ int val;
+
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%d", &val) != 1)
+ usage();
+ if (val < 0 || val > 100)
+ usage();
+ cinfo->smoothing_factor = val;
+
+ } else if (keymatch(arg, "targa", 1)) {
+ /* Input file is Targa format. */
+ is_targa = TRUE;
+
+ } else {
+ usage(); /* bogus switch */
+ }
+ }
+
+ /* Post-switch-scanning cleanup */
+
+ if (for_real) {
+
+ /* Set quantization tables for selected quality. */
+ /* Some or all may be overridden if -qtables is present. */
+ jpeg_set_quality(cinfo, quality, force_baseline);
+
+ if (qtablefile != NULL) /* process -qtables if it was present */
+ if (! read_quant_tables(cinfo, qtablefile,
+ q_scale_factor, force_baseline))
+ usage();
+
+ if (qslotsarg != NULL) /* process -qslots if it was present */
+ if (! set_quant_slots(cinfo, qslotsarg))
+ usage();
+
+ if (samplearg != NULL) /* process -sample if it was present */
+ if (! set_sample_factors(cinfo, samplearg))
+ usage();
+
+#ifdef C_PROGRESSIVE_SUPPORTED
+ if (simple_progressive) /* process -progressive; -scans can override */
+ jpeg_simple_progression(cinfo);
+#endif
+
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ if (scansarg != NULL) /* process -scans if it was present */
+ if (! read_scan_script(cinfo, scansarg))
+ usage();
+#endif
+ }
+
+ return argn; /* return index of next arg (file name) */
+}
+
+
+/*
+ * The main program.
+ */
+
+int
+main (int argc, char **argv)
+{
+ struct jpeg_compress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+#ifdef PROGRESS_REPORT
+ struct cdjpeg_progress_mgr progress;
+#endif
+ int file_index;
+ cjpeg_source_ptr src_mgr;
+ FILE * input_file;
+ FILE * output_file;
+ JDIMENSION num_scanlines;
+
+ /* On Mac, fetch a command line. */
+#ifdef USE_CCOMMAND
+ argc = ccommand(&argv);
+#endif
+
+ progname = argv[0];
+ if (progname == NULL || progname[0] == 0)
+ progname = "cjpeg"; /* in case C library doesn't provide it */