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