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865 lines
31 KiB
C
865 lines
31 KiB
C
/*---------------------------------------------------------------------------
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wpng - simple PNG-writing program wpng.c
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This program converts certain NetPBM binary files (grayscale and RGB,
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maxval = 255) to PNG. Non-interlaced PNGs are written progressively;
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interlaced PNGs are read and written in one memory-intensive blast.
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Thanks to Jean-loup Gailly for providing the necessary trick to read
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interactive text from the keyboard while stdin is redirected. Thanks
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to Cosmin Truta for Cygwin fixes.
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NOTE: includes provisional support for PNM type "8" (portable alphamap)
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images, presumed to be a 32-bit interleaved RGBA format; no pro-
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vision for possible interleaved grayscale+alpha (16-bit) format.
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THIS IS UNLIKELY TO BECOME AN OFFICIAL NETPBM ALPHA FORMAT!
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to do:
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- delete output file if quit before calling any writepng routines
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- process backspace with -text option under DOS/Win? (currently get ^H)
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---------------------------------------------------------------------------
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Changelog:
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- 1.01: initial public release
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- 1.02: modified to allow abbreviated options
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- 1.03: removed extraneous character from usage screen; fixed bug in
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command-line parsing
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- 1.04: fixed DOS/OS2/Win32 detection, including partial Cygwin fix
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(see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
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- 2.00: dual-licensed (added GNU GPL)
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- 2.01: check for integer overflow (Glenn R-P)
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[REPORTED BUG (win32 only): "contrib/gregbook/wpng.c - cmd line
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dose not work! In order to do something useful I needed to redirect
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both input and output, with cygwin and with bcc32 as well. Under
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Linux, the same wpng appears to work fine. I don't know what is
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the problem."]
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---------------------------------------------------------------------------
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Copyright (c) 1998-2007, 2017 Greg Roelofs. All rights reserved.
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This software is provided "as is," without warranty of any kind,
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express or implied. In no event shall the author or contributors
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be held liable for any damages arising in any way from the use of
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this software.
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The contents of this file are DUAL-LICENSED. You may modify and/or
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redistribute this software according to the terms of one of the
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following two licenses (at your option):
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LICENSE 1 ("BSD-like with advertising clause"):
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute
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it freely, subject to the following restrictions:
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1. Redistributions of source code must retain the above copyright
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notice, disclaimer, and this list of conditions.
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2. Redistributions in binary form must reproduce the above copyright
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notice, disclaimer, and this list of conditions in the documenta-
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tion and/or other materials provided with the distribution.
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3. All advertising materials mentioning features or use of this
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software must display the following acknowledgment:
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This product includes software developed by Greg Roelofs
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and contributors for the book, "PNG: The Definitive Guide,"
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published by O'Reilly and Associates.
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LICENSE 2 (GNU GPL v2 or later):
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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---------------------------------------------------------------------------*/
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#define PROGNAME "wpng"
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#define VERSION "2.00 of 2 June 2007"
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#define APPNAME "Simple PGM/PPM/PAM to PNG Converter"
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#if defined(__MSDOS__) || defined(__OS2__)
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# define DOS_OS2_W32
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#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
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# ifndef __GNUC__ /* treat Win32 native ports of gcc as Unix environments */
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# define DOS_OS2_W32
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# endif
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h> /* for jmpbuf declaration in writepng.h */
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#include <time.h>
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#ifdef DOS_OS2_W32
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# include <io.h> /* for isatty(), setmode() prototypes */
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# include <fcntl.h> /* O_BINARY for fdopen() without text translation */
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# ifdef __EMX__
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# ifndef getch
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# define getch() _read_kbd(0, 1, 0) /* need getche() */
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# endif
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# else /* !__EMX__ */
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# ifdef __GO32__
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# include <pc.h>
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# define getch() getkey() /* GRR: need getche() */
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# else
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# include <conio.h> /* for getche() console input */
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# endif
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# endif /* ?__EMX__ */
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# define FGETS(buf,len,stream) dos_kbd_gets(buf,len)
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#else
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# include <unistd.h> /* for isatty() prototype */
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# define FGETS fgets
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#endif
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/* #define DEBUG : this enables the Trace() macros */
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/* #define FORBID_LATIN1_CTRL : this requires the user to re-enter any
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text that includes control characters discouraged by the PNG spec; text
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that includes an escape character (27) must be re-entered regardless */
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#include "writepng.h" /* typedefs, common macros, writepng prototypes */
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/* local prototypes */
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static int wpng_isvalid_latin1(uch *p, int len);
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static void wpng_cleanup(void);
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#ifdef DOS_OS2_W32
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static char *dos_kbd_gets(char *buf, int len);
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#endif
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static mainprog_info wpng_info; /* lone global */
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int main(int argc, char **argv)
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{
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#ifndef DOS_OS2_W32
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FILE *keybd;
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#endif
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#ifdef sgi
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FILE *tmpfile; /* or we could just use keybd, since no overlap */
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char tmpline[80];
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#endif
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char *inname = NULL, outname[256];
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char *p, pnmchar, pnmline[256];
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char *bgstr, *textbuf = NULL;
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ulg rowbytes;
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int rc, len = 0;
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int error = 0;
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int text = FALSE;
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int maxval;
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double LUT_exponent; /* just the lookup table */
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double CRT_exponent = 2.2; /* just the monitor */
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double default_display_exponent; /* whole display system */
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double default_gamma = 0.0;
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wpng_info.infile = NULL;
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wpng_info.outfile = NULL;
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wpng_info.image_data = NULL;
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wpng_info.row_pointers = NULL;
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wpng_info.filter = FALSE;
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wpng_info.interlaced = FALSE;
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wpng_info.have_bg = FALSE;
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wpng_info.have_time = FALSE;
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wpng_info.have_text = 0;
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wpng_info.gamma = 0.0;
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/* First get the default value for our display-system exponent, i.e.,
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* the product of the CRT exponent and the exponent corresponding to
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* the frame-buffer's lookup table (LUT), if any. If the PNM image
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* looks correct on the user's display system, its file gamma is the
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* inverse of this value. (Note that this is not an exhaustive list
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* of LUT values--e.g., OpenStep has a lot of weird ones--but it should
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* cover 99% of the current possibilities. This section must ensure
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* that default_display_exponent is positive.) */
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#if defined(NeXT)
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/* third-party utilities can modify the default LUT exponent */
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LUT_exponent = 1.0 / 2.2;
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/*
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if (some_next_function_that_returns_gamma(&next_gamma))
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LUT_exponent = 1.0 / next_gamma;
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*/
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#elif defined(sgi)
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LUT_exponent = 1.0 / 1.7;
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/* there doesn't seem to be any documented function to
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* get the "gamma" value, so we do it the hard way */
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tmpfile = fopen("/etc/config/system.glGammaVal", "r");
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if (tmpfile) {
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double sgi_gamma;
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fgets(tmpline, 80, tmpfile);
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fclose(tmpfile);
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sgi_gamma = atof(tmpline);
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if (sgi_gamma > 0.0)
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LUT_exponent = 1.0 / sgi_gamma;
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}
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#elif defined(Macintosh)
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LUT_exponent = 1.8 / 2.61;
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/*
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if (some_mac_function_that_returns_gamma(&mac_gamma))
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LUT_exponent = mac_gamma / 2.61;
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*/
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#else
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LUT_exponent = 1.0; /* assume no LUT: most PCs */
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#endif
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/* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
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default_display_exponent = LUT_exponent * CRT_exponent;
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/* If the user has set the SCREEN_GAMMA environment variable as suggested
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* (somewhat imprecisely) in the libpng documentation, use that; otherwise
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* use the default value we just calculated. Either way, the user may
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* override this via a command-line option. */
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if ((p = getenv("SCREEN_GAMMA")) != NULL) {
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double exponent = atof(p);
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if (exponent > 0.0)
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default_gamma = 1.0 / exponent;
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}
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if (default_gamma == 0.0)
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default_gamma = 1.0 / default_display_exponent;
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/* Now parse the command line for options and the PNM filename. */
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while (*++argv && !error) {
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if (!strncmp(*argv, "-i", 2)) {
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wpng_info.interlaced = TRUE;
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} else if (!strncmp(*argv, "-time", 3)) {
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wpng_info.modtime = time(NULL);
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wpng_info.have_time = TRUE;
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} else if (!strncmp(*argv, "-text", 3)) {
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text = TRUE;
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} else if (!strncmp(*argv, "-gamma", 2)) {
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if (!*++argv)
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++error;
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else {
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wpng_info.gamma = atof(*argv);
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if (wpng_info.gamma <= 0.0)
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++error;
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else if (wpng_info.gamma > 1.01)
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fprintf(stderr, PROGNAME
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" warning: file gammas are usually less than 1.0\n");
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}
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} else if (!strncmp(*argv, "-bgcolor", 4)) {
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if (!*++argv)
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++error;
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else {
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bgstr = *argv;
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if (strlen(bgstr) != 7 || bgstr[0] != '#')
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++error;
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else {
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unsigned r, g, b; /* this way quiets compiler warnings */
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sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
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wpng_info.bg_red = (uch)r;
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wpng_info.bg_green = (uch)g;
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wpng_info.bg_blue = (uch)b;
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wpng_info.have_bg = TRUE;
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}
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}
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} else {
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if (**argv != '-') {
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inname = *argv;
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if (argv[1]) /* shouldn't be any more args after filename */
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++error;
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} else
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++error; /* not expecting any other options */
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}
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}
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/* open the input and output files, or register an error and abort */
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if (!inname) {
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if (isatty(0)) {
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fprintf(stderr, PROGNAME
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": must give input filename or provide image data via stdin\n");
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++error;
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} else {
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#ifdef DOS_OS2_W32
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/* some buggy C libraries require BOTH setmode() and fdopen(bin) */
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setmode(fileno(stdin), O_BINARY);
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setmode(fileno(stdout), O_BINARY);
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#endif
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if ((wpng_info.infile = fdopen(fileno(stdin), "rb")) == NULL) {
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fprintf(stderr, PROGNAME
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": unable to reopen stdin in binary mode\n");
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++error;
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} else
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if ((wpng_info.outfile = fdopen(fileno(stdout), "wb")) == NULL) {
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fprintf(stderr, PROGNAME
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": unable to reopen stdout in binary mode\n");
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fclose(wpng_info.infile);
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++error;
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} else
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wpng_info.filter = TRUE;
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}
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} else if ((len = strlen(inname)) > 250) {
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fprintf(stderr, PROGNAME ": input filename is too long [%d chars]\n",
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len);
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++error;
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} else if (!(wpng_info.infile = fopen(inname, "rb"))) {
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fprintf(stderr, PROGNAME ": can't open input file [%s]\n", inname);
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++error;
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}
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if (!error) {
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fgets(pnmline, 256, wpng_info.infile);
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if (pnmline[0] != 'P' || ((pnmchar = pnmline[1]) != '5' &&
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pnmchar != '6' && pnmchar != '8'))
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{
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fprintf(stderr, PROGNAME
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": input file [%s] is not a binary PGM, PPM or PAM file\n",
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inname);
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++error;
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} else {
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wpng_info.pnmtype = (int)(pnmchar - '0');
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if (wpng_info.pnmtype != 8)
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wpng_info.have_bg = FALSE; /* no need for bg if opaque */
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do {
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fgets(pnmline, 256, wpng_info.infile); /* lose any comments */
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} while (pnmline[0] == '#');
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sscanf(pnmline, "%ld %ld", &wpng_info.width, &wpng_info.height);
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do {
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fgets(pnmline, 256, wpng_info.infile); /* more comment lines */
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} while (pnmline[0] == '#');
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sscanf(pnmline, "%d", &maxval);
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if (wpng_info.width <= 0L || wpng_info.height <= 0L ||
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maxval != 255)
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{
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fprintf(stderr, PROGNAME
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": only positive width/height, maxval == 255 allowed \n");
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++error;
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}
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wpng_info.sample_depth = 8; /* <==> maxval 255 */
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if (!wpng_info.filter) {
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/* make outname from inname */
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if ((p = strrchr(inname, '.')) == NULL ||
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(p - inname) != (len - 4))
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{
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strcpy(outname, inname);
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strcpy(outname+len, ".png");
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} else {
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len -= 4;
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strncpy(outname, inname, len);
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strcpy(outname+len, ".png");
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}
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/* check if outname already exists; if not, open */
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if ((wpng_info.outfile = fopen(outname, "rb")) != NULL) {
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fprintf(stderr, PROGNAME ": output file exists [%s]\n",
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outname);
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fclose(wpng_info.outfile);
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++error;
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} else if (!(wpng_info.outfile = fopen(outname, "wb"))) {
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fprintf(stderr, PROGNAME ": can't open output file [%s]\n",
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outname);
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++error;
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}
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}
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}
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if (error) {
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fclose(wpng_info.infile);
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wpng_info.infile = NULL;
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if (wpng_info.filter) {
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fclose(wpng_info.outfile);
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wpng_info.outfile = NULL;
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}
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}
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}
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/* if we had any errors, print usage and die horrible death...arrr! */
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if (error) {
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fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, APPNAME);
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writepng_version_info();
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fprintf(stderr, "\n"
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"Usage: %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n"
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"or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n"
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" exp \ttransfer-function exponent (``gamma'') of the image in\n"
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"\t\t floating-point format (e.g., ``%.5f''); if image looks\n"
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"\t\t correct on given display system, image gamma is equal to\n"
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"\t\t inverse of display-system exponent, i.e., 1 / (LUT * CRT)\n"
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"\t\t (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
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"\t\t first varies, second is usually 2.2, all are positive)\n"
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" bg \tdesired background color for alpha-channel images, in\n"
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"\t\t 7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
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"\t\t same as HTML colors)\n"
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" -text\tprompt interactively for text info (tEXt chunks)\n"
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" -time\tinclude a tIME chunk (last modification time)\n"
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" -interlace\twrite interlaced PNG image\n"
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"\n"
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"pnmfile or stdin must be a binary PGM (`P5'), PPM (`P6') or (extremely\n"
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"unofficial and unsupported!) PAM (`P8') file. Currently it is required\n"
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"to have maxval == 255 (i.e., no scaling). If pnmfile is specified, it\n"
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"is converted to the corresponding PNG file with the same base name but a\n"
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"``.png'' extension; files read from stdin are converted and sent to stdout.\n"
|
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"The conversion is progressive (low memory usage) unless interlacing is\n"
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"requested; in that case the whole image will be buffered in memory and\n"
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"written in one call.\n"
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"\n", PROGNAME, PROGNAME, default_gamma);
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exit(1);
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}
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|
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|
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/* prepare the text buffers for libpng's use; note that even though
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* PNG's png_text struct includes a length field, we don't have to fill
|
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* it out */
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|
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if (text &&
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#ifndef DOS_OS2_W32
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(keybd = fdopen(fileno(stderr), "r")) != NULL &&
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#endif
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(textbuf = (char *)malloc((5 + 9)*75)) != NULL)
|
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{
|
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int i, valid, result;
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|
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fprintf(stderr,
|
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"Enter text info (no more than 72 characters per line);\n");
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fprintf(stderr, "to skip a field, hit the <Enter> key.\n");
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|
/* note: just <Enter> leaves len == 1 */
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|
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do {
|
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valid = TRUE;
|
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p = textbuf + TEXT_TITLE_OFFSET;
|
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fprintf(stderr, " Title: ");
|
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fflush(stderr);
|
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if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
|
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if (p[len-1] == '\n')
|
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p[--len] = '\0';
|
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wpng_info.title = p;
|
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wpng_info.have_text |= TEXT_TITLE;
|
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if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
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fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_TITLE;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_TITLE;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
do {
|
|
valid = TRUE;
|
|
p = textbuf + TEXT_AUTHOR_OFFSET;
|
|
fprintf(stderr, " Author: ");
|
|
fflush(stderr);
|
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
|
|
if (p[len-1] == '\n')
|
|
p[--len] = '\0';
|
|
wpng_info.author = p;
|
|
wpng_info.have_text |= TEXT_AUTHOR;
|
|
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
|
fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_AUTHOR;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_AUTHOR;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
do {
|
|
valid = TRUE;
|
|
p = textbuf + TEXT_DESC_OFFSET;
|
|
fprintf(stderr, " Description (up to 9 lines):\n");
|
|
for (i = 1; i < 10; ++i) {
|
|
fprintf(stderr, " [%d] ", i);
|
|
fflush(stderr);
|
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1)
|
|
p += len; /* now points at NULL; char before is newline */
|
|
else
|
|
break;
|
|
}
|
|
if ((len = p - (textbuf + TEXT_DESC_OFFSET)) > 1) {
|
|
if (p[-1] == '\n') {
|
|
p[-1] = '\0';
|
|
--len;
|
|
}
|
|
wpng_info.desc = textbuf + TEXT_DESC_OFFSET;
|
|
wpng_info.have_text |= TEXT_DESC;
|
|
p = textbuf + TEXT_DESC_OFFSET;
|
|
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
|
fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_DESC;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_DESC;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
do {
|
|
valid = TRUE;
|
|
p = textbuf + TEXT_COPY_OFFSET;
|
|
fprintf(stderr, " Copyright: ");
|
|
fflush(stderr);
|
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
|
|
if (p[len-1] == '\n')
|
|
p[--len] = '\0';
|
|
wpng_info.copyright = p;
|
|
wpng_info.have_text |= TEXT_COPY;
|
|
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
|
fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_COPY;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_COPY;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
do {
|
|
valid = TRUE;
|
|
p = textbuf + TEXT_EMAIL_OFFSET;
|
|
fprintf(stderr, " E-mail: ");
|
|
fflush(stderr);
|
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
|
|
if (p[len-1] == '\n')
|
|
p[--len] = '\0';
|
|
wpng_info.email = p;
|
|
wpng_info.have_text |= TEXT_EMAIL;
|
|
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
|
fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_EMAIL;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_EMAIL;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
do {
|
|
valid = TRUE;
|
|
p = textbuf + TEXT_URL_OFFSET;
|
|
fprintf(stderr, " URL: ");
|
|
fflush(stderr);
|
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
|
|
if (p[len-1] == '\n')
|
|
p[--len] = '\0';
|
|
wpng_info.url = p;
|
|
wpng_info.have_text |= TEXT_URL;
|
|
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
|
|
fprintf(stderr, " " PROGNAME " warning: character code"
|
|
" %u is %sdiscouraged by the PNG\n specification "
|
|
"[first occurrence was at character position #%d]\n",
|
|
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
|
|
result+1);
|
|
fflush(stderr);
|
|
#ifdef FORBID_LATIN1_CTRL
|
|
wpng_info.have_text &= ~TEXT_URL;
|
|
valid = FALSE;
|
|
#else
|
|
if (p[result] == 27) { /* escape character */
|
|
wpng_info.have_text &= ~TEXT_URL;
|
|
valid = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
} while (!valid);
|
|
|
|
#ifndef DOS_OS2_W32
|
|
fclose(keybd);
|
|
#endif
|
|
|
|
} else if (text) {
|
|
fprintf(stderr, PROGNAME ": unable to allocate memory for text\n");
|
|
text = FALSE;
|
|
wpng_info.have_text = 0;
|
|
}
|
|
|
|
|
|
/* allocate libpng stuff, initialize transformations, write pre-IDAT data */
|
|
|
|
if ((rc = writepng_init(&wpng_info)) != 0) {
|
|
switch (rc) {
|
|
case 2:
|
|
fprintf(stderr, PROGNAME
|
|
": libpng initialization problem (longjmp)\n");
|
|
break;
|
|
case 4:
|
|
fprintf(stderr, PROGNAME ": insufficient memory\n");
|
|
break;
|
|
case 11:
|
|
fprintf(stderr, PROGNAME
|
|
": internal logic error (unexpected PNM type)\n");
|
|
break;
|
|
default:
|
|
fprintf(stderr, PROGNAME
|
|
": unknown writepng_init() error\n");
|
|
break;
|
|
}
|
|
exit(rc);
|
|
}
|
|
|
|
|
|
/* free textbuf, since it's a completely local variable and all text info
|
|
* has just been written to the PNG file */
|
|
|
|
if (text && textbuf) {
|
|
free(textbuf);
|
|
textbuf = NULL;
|
|
}
|
|
|
|
|
|
/* calculate rowbytes on basis of image type; note that this becomes much
|
|
* more complicated if we choose to support PBM type, ASCII PNM types, or
|
|
* 16-bit-per-sample binary data [currently not an official NetPBM type] */
|
|
|
|
if (wpng_info.pnmtype == 5)
|
|
rowbytes = wpng_info.width;
|
|
else if (wpng_info.pnmtype == 6)
|
|
rowbytes = wpng_info.width * 3;
|
|
else /* if (wpng_info.pnmtype == 8) */
|
|
rowbytes = wpng_info.width * 4;
|
|
|
|
|
|
/* read and write the image, either in its entirety (if writing interlaced
|
|
* PNG) or row by row (if non-interlaced) */
|
|
|
|
fprintf(stderr, "Encoding image data...\n");
|
|
fflush(stderr);
|
|
|
|
if (wpng_info.interlaced) {
|
|
long i;
|
|
ulg bytes;
|
|
ulg image_bytes;
|
|
|
|
/* Guard against integer overflow */
|
|
if (wpng_info_height > ((size_t)(-1)/rowbytes ||
|
|
wpng_info_height > ((ulg)(-1)/rowbytes) {
|
|
fprintf(stderr, PROGNAME ": image_data buffer too large\n");
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(5);
|
|
}
|
|
|
|
image_bytes = rowbytes * wpng_info.height;
|
|
|
|
wpng_info.image_data = (uch *)malloc(image_bytes);
|
|
wpng_info.row_pointers = (uch **)malloc(wpng_info.height*sizeof(uch *));
|
|
if (wpng_info.image_data == NULL || wpng_info.row_pointers == NULL) {
|
|
fprintf(stderr, PROGNAME ": insufficient memory for image data\n");
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(5);
|
|
}
|
|
for (i = 0; i < wpng_info.height; ++i)
|
|
wpng_info.row_pointers[i] = wpng_info.image_data + i*rowbytes;
|
|
bytes = fread(wpng_info.image_data, 1, image_bytes, wpng_info.infile);
|
|
if (bytes != image_bytes) {
|
|
fprintf(stderr, PROGNAME ": expected %lu bytes, got %lu bytes\n",
|
|
image_bytes, bytes);
|
|
fprintf(stderr, " (continuing anyway)\n");
|
|
}
|
|
if (writepng_encode_image(&wpng_info) != 0) {
|
|
fprintf(stderr, PROGNAME
|
|
": libpng problem (longjmp) while writing image data\n");
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(2);
|
|
}
|
|
|
|
} else /* not interlaced: write progressively (row by row) */ {
|
|
long j;
|
|
ulg bytes;
|
|
|
|
wpng_info.image_data = (uch *)malloc(rowbytes);
|
|
if (wpng_info.image_data == NULL) {
|
|
fprintf(stderr, PROGNAME ": insufficient memory for row data\n");
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(5);
|
|
}
|
|
error = 0;
|
|
for (j = wpng_info.height; j > 0L; --j) {
|
|
bytes = fread(wpng_info.image_data, 1, rowbytes, wpng_info.infile);
|
|
if (bytes != rowbytes) {
|
|
fprintf(stderr, PROGNAME
|
|
": expected %lu bytes, got %lu bytes (row %ld)\n", rowbytes,
|
|
bytes, wpng_info.height-j);
|
|
++error;
|
|
break;
|
|
}
|
|
if (writepng_encode_row(&wpng_info) != 0) {
|
|
fprintf(stderr, PROGNAME
|
|
": libpng problem (longjmp) while writing row %ld\n",
|
|
wpng_info.height-j);
|
|
++error;
|
|
break;
|
|
}
|
|
}
|
|
if (error) {
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(2);
|
|
}
|
|
if (writepng_encode_finish(&wpng_info) != 0) {
|
|
fprintf(stderr, PROGNAME ": error on final libpng call\n");
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
exit(2);
|
|
}
|
|
}
|
|
|
|
|
|
/* OK, we're done (successfully): clean up all resources and quit */
|
|
|
|
fprintf(stderr, "Done.\n");
|
|
fflush(stderr);
|
|
|
|
writepng_cleanup(&wpng_info);
|
|
wpng_cleanup();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int wpng_isvalid_latin1(uch *p, int len)
|
|
{
|
|
int i, result = -1;
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160)
|
|
continue; /* character is completely OK */
|
|
if (result < 0 || (p[result] != 27 && p[i] == 27))
|
|
result = i; /* mark location of first questionable one */
|
|
} /* or of first escape character (bad) */
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void wpng_cleanup(void)
|
|
{
|
|
if (wpng_info.outfile) {
|
|
fclose(wpng_info.outfile);
|
|
wpng_info.outfile = NULL;
|
|
}
|
|
|
|
if (wpng_info.infile) {
|
|
fclose(wpng_info.infile);
|
|
wpng_info.infile = NULL;
|
|
}
|
|
|
|
if (wpng_info.image_data) {
|
|
free(wpng_info.image_data);
|
|
wpng_info.image_data = NULL;
|
|
}
|
|
|
|
if (wpng_info.row_pointers) {
|
|
free(wpng_info.row_pointers);
|
|
wpng_info.row_pointers = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef DOS_OS2_W32
|
|
|
|
static char *dos_kbd_gets(char *buf, int len)
|
|
{
|
|
int ch, count=0;
|
|
|
|
do {
|
|
buf[count++] = ch = getche();
|
|
} while (ch != '\r' && count < len-1);
|
|
|
|
buf[count--] = '\0'; /* terminate string */
|
|
if (buf[count] == '\r') /* Enter key makes CR, so change to newline */
|
|
buf[count] = '\n';
|
|
|
|
fprintf(stderr, "\n"); /* Enter key does *not* cause a newline */
|
|
fflush(stderr);
|
|
|
|
return buf;
|
|
}
|
|
|
|
#endif /* DOS_OS2_W32 */
|