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865 lines
31 KiB
865 lines
31 KiB
/*--------------------------------------------------------------------------- |
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|
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wpng - simple PNG-writing program wpng.c |
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|
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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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|
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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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|
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/* #define DEBUG : this enables the Trace() macros */ |
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|
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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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|
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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; |
|
strncpy(outname, inname, len); |
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strcpy(outname+len, ".png"); |
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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", |
|
outname); |
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++error; |
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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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|
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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" |
|
"The conversion is progressive (low memory usage) unless interlacing is\n" |
|
"requested; in that case the whole image will be buffered in memory and\n" |
|
"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 |
|
* it out */ |
|
|
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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 |
|
(textbuf = (char *)malloc((5 + 9)*75)) != NULL) |
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{ |
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int i, valid, result; |
|
|
|
fprintf(stderr, |
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"Enter text info (no more than 72 characters per line);\n"); |
|
fprintf(stderr, "to skip a field, hit the <Enter> key.\n"); |
|
/* note: just <Enter> leaves len == 1 */ |
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|
|
do { |
|
valid = TRUE; |
|
p = textbuf + TEXT_TITLE_OFFSET; |
|
fprintf(stderr, " Title: "); |
|
fflush(stderr); |
|
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
|
if (p[len-1] == '\n') |
|
p[--len] = '\0'; |
|
wpng_info.title = p; |
|
wpng_info.have_text |= TEXT_TITLE; |
|
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_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 */
|
|
|