The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /*--------------------------------------------------------------------------- |
| 2 | |
| 3 | wpng - simple PNG-writing program wpng.c |
| 4 | |
| 5 | This program converts certain NetPBM binary files (grayscale and RGB, |
| 6 | maxval = 255) to PNG. Non-interlaced PNGs are written progressively; |
| 7 | interlaced PNGs are read and written in one memory-intensive blast. |
| 8 | |
| 9 | Thanks to Jean-loup Gailly for providing the necessary trick to read |
| 10 | interactive text from the keyboard while stdin is redirected. Thanks |
| 11 | to Cosmin Truta for Cygwin fixes. |
| 12 | |
| 13 | NOTE: includes provisional support for PNM type "8" (portable alphamap) |
| 14 | images, presumed to be a 32-bit interleaved RGBA format; no pro- |
| 15 | vision for possible interleaved grayscale+alpha (16-bit) format. |
| 16 | THIS IS UNLIKELY TO BECOME AN OFFICIAL NETPBM ALPHA FORMAT! |
| 17 | |
| 18 | to do: |
| 19 | - delete output file if quit before calling any writepng routines |
| 20 | - process backspace with -text option under DOS/Win? (currently get ^H) |
| 21 | |
| 22 | --------------------------------------------------------------------------- |
| 23 | |
| 24 | Changelog: |
| 25 | - 1.01: initial public release |
| 26 | - 1.02: modified to allow abbreviated options |
| 27 | - 1.03: removed extraneous character from usage screen; fixed bug in |
| 28 | command-line parsing |
| 29 | - 1.04: fixed DOS/OS2/Win32 detection, including partial Cygwin fix |
| 30 | (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff) |
| 31 | - 2.00: dual-licensed (added GNU GPL) |
| 32 | |
| 33 | [REPORTED BUG (win32 only): "contrib/gregbook/wpng.c - cmd line |
| 34 | dose not work! In order to do something useful I needed to redirect |
| 35 | both input and output, with cygwin and with bcc32 as well. Under |
| 36 | Linux, the same wpng appears to work fine. I don't know what is |
| 37 | the problem."] |
| 38 | |
| 39 | --------------------------------------------------------------------------- |
| 40 | |
| 41 | Copyright (c) 1998-2007 Greg Roelofs. All rights reserved. |
| 42 | |
| 43 | This software is provided "as is," without warranty of any kind, |
| 44 | express or implied. In no event shall the author or contributors |
| 45 | be held liable for any damages arising in any way from the use of |
| 46 | this software. |
| 47 | |
| 48 | The contents of this file are DUAL-LICENSED. You may modify and/or |
| 49 | redistribute this software according to the terms of one of the |
| 50 | following two licenses (at your option): |
| 51 | |
| 52 | |
| 53 | LICENSE 1 ("BSD-like with advertising clause"): |
| 54 | |
| 55 | Permission is granted to anyone to use this software for any purpose, |
| 56 | including commercial applications, and to alter it and redistribute |
| 57 | it freely, subject to the following restrictions: |
| 58 | |
| 59 | 1. Redistributions of source code must retain the above copyright |
| 60 | notice, disclaimer, and this list of conditions. |
| 61 | 2. Redistributions in binary form must reproduce the above copyright |
| 62 | notice, disclaimer, and this list of conditions in the documenta- |
| 63 | tion and/or other materials provided with the distribution. |
| 64 | 3. All advertising materials mentioning features or use of this |
| 65 | software must display the following acknowledgment: |
| 66 | |
| 67 | This product includes software developed by Greg Roelofs |
| 68 | and contributors for the book, "PNG: The Definitive Guide," |
| 69 | published by O'Reilly and Associates. |
| 70 | |
| 71 | |
| 72 | LICENSE 2 (GNU GPL v2 or later): |
| 73 | |
| 74 | This program is free software; you can redistribute it and/or modify |
| 75 | it under the terms of the GNU General Public License as published by |
| 76 | the Free Software Foundation; either version 2 of the License, or |
| 77 | (at your option) any later version. |
| 78 | |
| 79 | This program is distributed in the hope that it will be useful, |
| 80 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 81 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 82 | GNU General Public License for more details. |
| 83 | |
| 84 | You should have received a copy of the GNU General Public License |
| 85 | along with this program; if not, write to the Free Software Foundation, |
| 86 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 87 | |
| 88 | ---------------------------------------------------------------------------*/ |
| 89 | |
| 90 | #define PROGNAME "wpng" |
| 91 | #define VERSION "2.00 of 2 June 2007" |
| 92 | #define APPNAME "Simple PGM/PPM/PAM to PNG Converter" |
| 93 | |
| 94 | #if defined(__MSDOS__) || defined(__OS2__) |
| 95 | # define DOS_OS2_W32 |
| 96 | #elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) |
| 97 | # ifndef __GNUC__ /* treat Win32 native ports of gcc as Unix environments */ |
| 98 | # define DOS_OS2_W32 |
| 99 | # endif |
| 100 | #endif |
| 101 | |
| 102 | #include <stdio.h> |
| 103 | #include <stdlib.h> |
| 104 | #include <string.h> |
| 105 | #include <setjmp.h> /* for jmpbuf declaration in writepng.h */ |
| 106 | #include <time.h> |
| 107 | |
| 108 | #ifdef DOS_OS2_W32 |
| 109 | # include <io.h> /* for isatty(), setmode() prototypes */ |
| 110 | # include <fcntl.h> /* O_BINARY for fdopen() without text translation */ |
| 111 | # ifdef __EMX__ |
| 112 | # ifndef getch |
| 113 | # define getch() _read_kbd(0, 1, 0) /* need getche() */ |
| 114 | # endif |
| 115 | # else /* !__EMX__ */ |
| 116 | # ifdef __GO32__ |
| 117 | # include <pc.h> |
| 118 | # define getch() getkey() /* GRR: need getche() */ |
| 119 | # else |
| 120 | # include <conio.h> /* for getche() console input */ |
| 121 | # endif |
| 122 | # endif /* ?__EMX__ */ |
| 123 | # define FGETS(buf,len,stream) dos_kbd_gets(buf,len) |
| 124 | #else |
| 125 | # include <unistd.h> /* for isatty() prototype */ |
| 126 | # define FGETS fgets |
| 127 | #endif |
| 128 | |
| 129 | /* #define DEBUG : this enables the Trace() macros */ |
| 130 | |
| 131 | /* #define FORBID_LATIN1_CTRL : this requires the user to re-enter any |
| 132 | text that includes control characters discouraged by the PNG spec; text |
| 133 | that includes an escape character (27) must be re-entered regardless */ |
| 134 | |
| 135 | #include "writepng.h" /* typedefs, common macros, writepng prototypes */ |
| 136 | |
| 137 | |
| 138 | |
| 139 | /* local prototypes */ |
| 140 | |
| 141 | static int wpng_isvalid_latin1(uch *p, int len); |
| 142 | static void wpng_cleanup(void); |
| 143 | |
| 144 | #ifdef DOS_OS2_W32 |
| 145 | static char *dos_kbd_gets(char *buf, int len); |
| 146 | #endif |
| 147 | |
| 148 | |
| 149 | |
| 150 | static mainprog_info wpng_info; /* lone global */ |
| 151 | |
| 152 | |
| 153 | |
| 154 | int main(int argc, char **argv) |
| 155 | { |
| 156 | #ifndef DOS_OS2_W32 |
| 157 | FILE *keybd; |
| 158 | #endif |
| 159 | #ifdef sgi |
| 160 | FILE *tmpfile; /* or we could just use keybd, since no overlap */ |
| 161 | char tmpline[80]; |
| 162 | #endif |
| 163 | char *inname = NULL, outname[256]; |
| 164 | char *p, pnmchar, pnmline[256]; |
| 165 | char *bgstr, *textbuf = NULL; |
| 166 | ulg rowbytes; |
| 167 | int rc, len = 0; |
| 168 | int error = 0; |
| 169 | int text = FALSE; |
| 170 | int maxval; |
| 171 | double LUT_exponent; /* just the lookup table */ |
| 172 | double CRT_exponent = 2.2; /* just the monitor */ |
| 173 | double default_display_exponent; /* whole display system */ |
| 174 | double default_gamma = 0.0; |
| 175 | |
| 176 | |
| 177 | wpng_info.infile = NULL; |
| 178 | wpng_info.outfile = NULL; |
| 179 | wpng_info.image_data = NULL; |
| 180 | wpng_info.row_pointers = NULL; |
| 181 | wpng_info.filter = FALSE; |
| 182 | wpng_info.interlaced = FALSE; |
| 183 | wpng_info.have_bg = FALSE; |
| 184 | wpng_info.have_time = FALSE; |
| 185 | wpng_info.have_text = 0; |
| 186 | wpng_info.gamma = 0.0; |
| 187 | |
| 188 | |
| 189 | /* First get the default value for our display-system exponent, i.e., |
| 190 | * the product of the CRT exponent and the exponent corresponding to |
| 191 | * the frame-buffer's lookup table (LUT), if any. If the PNM image |
| 192 | * looks correct on the user's display system, its file gamma is the |
| 193 | * inverse of this value. (Note that this is not an exhaustive list |
| 194 | * of LUT values--e.g., OpenStep has a lot of weird ones--but it should |
| 195 | * cover 99% of the current possibilities. This section must ensure |
| 196 | * that default_display_exponent is positive.) */ |
| 197 | |
| 198 | #if defined(NeXT) |
| 199 | /* third-party utilities can modify the default LUT exponent */ |
| 200 | LUT_exponent = 1.0 / 2.2; |
| 201 | /* |
| 202 | if (some_next_function_that_returns_gamma(&next_gamma)) |
| 203 | LUT_exponent = 1.0 / next_gamma; |
| 204 | */ |
| 205 | #elif defined(sgi) |
| 206 | LUT_exponent = 1.0 / 1.7; |
| 207 | /* there doesn't seem to be any documented function to |
| 208 | * get the "gamma" value, so we do it the hard way */ |
| 209 | tmpfile = fopen("/etc/config/system.glGammaVal", "r"); |
| 210 | if (tmpfile) { |
| 211 | double sgi_gamma; |
| 212 | |
| 213 | fgets(tmpline, 80, tmpfile); |
| 214 | fclose(tmpfile); |
| 215 | sgi_gamma = atof(tmpline); |
| 216 | if (sgi_gamma > 0.0) |
| 217 | LUT_exponent = 1.0 / sgi_gamma; |
| 218 | } |
| 219 | #elif defined(Macintosh) |
| 220 | LUT_exponent = 1.8 / 2.61; |
| 221 | /* |
| 222 | if (some_mac_function_that_returns_gamma(&mac_gamma)) |
| 223 | LUT_exponent = mac_gamma / 2.61; |
| 224 | */ |
| 225 | #else |
| 226 | LUT_exponent = 1.0; /* assume no LUT: most PCs */ |
| 227 | #endif |
| 228 | |
| 229 | /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */ |
| 230 | default_display_exponent = LUT_exponent * CRT_exponent; |
| 231 | |
| 232 | |
| 233 | /* If the user has set the SCREEN_GAMMA environment variable as suggested |
| 234 | * (somewhat imprecisely) in the libpng documentation, use that; otherwise |
| 235 | * use the default value we just calculated. Either way, the user may |
| 236 | * override this via a command-line option. */ |
| 237 | |
| 238 | if ((p = getenv("SCREEN_GAMMA")) != NULL) { |
| 239 | double exponent = atof(p); |
| 240 | |
| 241 | if (exponent > 0.0) |
| 242 | default_gamma = 1.0 / exponent; |
| 243 | } |
| 244 | |
| 245 | if (default_gamma == 0.0) |
| 246 | default_gamma = 1.0 / default_display_exponent; |
| 247 | |
| 248 | |
| 249 | /* Now parse the command line for options and the PNM filename. */ |
| 250 | |
| 251 | while (*++argv && !error) { |
| 252 | if (!strncmp(*argv, "-i", 2)) { |
| 253 | wpng_info.interlaced = TRUE; |
| 254 | } else if (!strncmp(*argv, "-time", 3)) { |
| 255 | wpng_info.modtime = time(NULL); |
| 256 | wpng_info.have_time = TRUE; |
| 257 | } else if (!strncmp(*argv, "-text", 3)) { |
| 258 | text = TRUE; |
| 259 | } else if (!strncmp(*argv, "-gamma", 2)) { |
| 260 | if (!*++argv) |
| 261 | ++error; |
| 262 | else { |
| 263 | wpng_info.gamma = atof(*argv); |
| 264 | if (wpng_info.gamma <= 0.0) |
| 265 | ++error; |
| 266 | else if (wpng_info.gamma > 1.01) |
| 267 | fprintf(stderr, PROGNAME |
| 268 | " warning: file gammas are usually less than 1.0\n"); |
| 269 | } |
| 270 | } else if (!strncmp(*argv, "-bgcolor", 4)) { |
| 271 | if (!*++argv) |
| 272 | ++error; |
| 273 | else { |
| 274 | bgstr = *argv; |
| 275 | if (strlen(bgstr) != 7 || bgstr[0] != '#') |
| 276 | ++error; |
| 277 | else { |
| 278 | unsigned r, g, b; /* this way quiets compiler warnings */ |
| 279 | |
| 280 | sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b); |
| 281 | wpng_info.bg_red = (uch)r; |
| 282 | wpng_info.bg_green = (uch)g; |
| 283 | wpng_info.bg_blue = (uch)b; |
| 284 | wpng_info.have_bg = TRUE; |
| 285 | } |
| 286 | } |
| 287 | } else { |
| 288 | if (**argv != '-') { |
| 289 | inname = *argv; |
| 290 | if (argv[1]) /* shouldn't be any more args after filename */ |
| 291 | ++error; |
| 292 | } else |
| 293 | ++error; /* not expecting any other options */ |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | |
| 298 | /* open the input and output files, or register an error and abort */ |
| 299 | |
| 300 | if (!inname) { |
| 301 | if (isatty(0)) { |
| 302 | fprintf(stderr, PROGNAME |
| 303 | ": must give input filename or provide image data via stdin\n"); |
| 304 | ++error; |
| 305 | } else { |
| 306 | #ifdef DOS_OS2_W32 |
| 307 | /* some buggy C libraries require BOTH setmode() and fdopen(bin) */ |
| 308 | setmode(fileno(stdin), O_BINARY); |
| 309 | setmode(fileno(stdout), O_BINARY); |
| 310 | #endif |
| 311 | if ((wpng_info.infile = fdopen(fileno(stdin), "rb")) == NULL) { |
| 312 | fprintf(stderr, PROGNAME |
| 313 | ": unable to reopen stdin in binary mode\n"); |
| 314 | ++error; |
| 315 | } else |
| 316 | if ((wpng_info.outfile = fdopen(fileno(stdout), "wb")) == NULL) { |
| 317 | fprintf(stderr, PROGNAME |
| 318 | ": unable to reopen stdout in binary mode\n"); |
| 319 | fclose(wpng_info.infile); |
| 320 | ++error; |
| 321 | } else |
| 322 | wpng_info.filter = TRUE; |
| 323 | } |
| 324 | } else if ((len = strlen(inname)) > 250) { |
| 325 | fprintf(stderr, PROGNAME ": input filename is too long [%d chars]\n", |
| 326 | len); |
| 327 | ++error; |
| 328 | } else if (!(wpng_info.infile = fopen(inname, "rb"))) { |
| 329 | fprintf(stderr, PROGNAME ": can't open input file [%s]\n", inname); |
| 330 | ++error; |
| 331 | } |
| 332 | |
| 333 | if (!error) { |
| 334 | fgets(pnmline, 256, wpng_info.infile); |
| 335 | if (pnmline[0] != 'P' || ((pnmchar = pnmline[1]) != '5' && |
| 336 | pnmchar != '6' && pnmchar != '8')) |
| 337 | { |
| 338 | fprintf(stderr, PROGNAME |
| 339 | ": input file [%s] is not a binary PGM, PPM or PAM file\n", |
| 340 | inname); |
| 341 | ++error; |
| 342 | } else { |
| 343 | wpng_info.pnmtype = (int)(pnmchar - '0'); |
| 344 | if (wpng_info.pnmtype != 8) |
| 345 | wpng_info.have_bg = FALSE; /* no need for bg if opaque */ |
| 346 | do { |
| 347 | fgets(pnmline, 256, wpng_info.infile); /* lose any comments */ |
| 348 | } while (pnmline[0] == '#'); |
| 349 | sscanf(pnmline, "%ld %ld", &wpng_info.width, &wpng_info.height); |
| 350 | do { |
| 351 | fgets(pnmline, 256, wpng_info.infile); /* more comment lines */ |
| 352 | } while (pnmline[0] == '#'); |
| 353 | sscanf(pnmline, "%d", &maxval); |
| 354 | if (wpng_info.width <= 0L || wpng_info.height <= 0L || |
| 355 | maxval != 255) |
| 356 | { |
| 357 | fprintf(stderr, PROGNAME |
| 358 | ": only positive width/height, maxval == 255 allowed \n"); |
| 359 | ++error; |
| 360 | } |
| 361 | wpng_info.sample_depth = 8; /* <==> maxval 255 */ |
| 362 | |
| 363 | if (!wpng_info.filter) { |
| 364 | /* make outname from inname */ |
| 365 | if ((p = strrchr(inname, '.')) == NULL || |
| 366 | (p - inname) != (len - 4)) |
| 367 | { |
| 368 | strcpy(outname, inname); |
| 369 | strcpy(outname+len, ".png"); |
| 370 | } else { |
| 371 | len -= 4; |
| 372 | strncpy(outname, inname, len); |
| 373 | strcpy(outname+len, ".png"); |
| 374 | } |
| 375 | /* check if outname already exists; if not, open */ |
| 376 | if ((wpng_info.outfile = fopen(outname, "rb")) != NULL) { |
| 377 | fprintf(stderr, PROGNAME ": output file exists [%s]\n", |
| 378 | outname); |
| 379 | fclose(wpng_info.outfile); |
| 380 | ++error; |
| 381 | } else if (!(wpng_info.outfile = fopen(outname, "wb"))) { |
| 382 | fprintf(stderr, PROGNAME ": can't open output file [%s]\n", |
| 383 | outname); |
| 384 | ++error; |
| 385 | } |
| 386 | } |
| 387 | } |
| 388 | if (error) { |
| 389 | fclose(wpng_info.infile); |
| 390 | wpng_info.infile = NULL; |
| 391 | if (wpng_info.filter) { |
| 392 | fclose(wpng_info.outfile); |
| 393 | wpng_info.outfile = NULL; |
| 394 | } |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | |
| 399 | /* if we had any errors, print usage and die horrible death...arrr! */ |
| 400 | |
| 401 | if (error) { |
| 402 | fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, APPNAME); |
| 403 | writepng_version_info(); |
| 404 | fprintf(stderr, "\n" |
| 405 | "Usage: %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n" |
| 406 | "or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n" |
| 407 | " exp \ttransfer-function exponent (``gamma'') of the image in\n" |
| 408 | "\t\t floating-point format (e.g., ``%.5f''); if image looks\n" |
| 409 | "\t\t correct on given display system, image gamma is equal to\n" |
| 410 | "\t\t inverse of display-system exponent, i.e., 1 / (LUT * CRT)\n" |
| 411 | "\t\t (where LUT = lookup-table exponent and CRT = CRT exponent;\n" |
| 412 | "\t\t first varies, second is usually 2.2, all are positive)\n" |
| 413 | " bg \tdesired background color for alpha-channel images, in\n" |
| 414 | "\t\t 7-character hex RGB format (e.g., ``#ff7700'' for orange:\n" |
| 415 | "\t\t same as HTML colors)\n" |
| 416 | " -text\tprompt interactively for text info (tEXt chunks)\n" |
| 417 | " -time\tinclude a tIME chunk (last modification time)\n" |
| 418 | " -interlace\twrite interlaced PNG image\n" |
| 419 | "\n" |
| 420 | "pnmfile or stdin must be a binary PGM (`P5'), PPM (`P6') or (extremely\n" |
| 421 | "unofficial and unsupported!) PAM (`P8') file. Currently it is required\n" |
| 422 | "to have maxval == 255 (i.e., no scaling). If pnmfile is specified, it\n" |
| 423 | "is converted to the corresponding PNG file with the same base name but a\n" |
| 424 | "``.png'' extension; files read from stdin are converted and sent to stdout.\n" |
| 425 | "The conversion is progressive (low memory usage) unless interlacing is\n" |
| 426 | "requested; in that case the whole image will be buffered in memory and\n" |
| 427 | "written in one call.\n" |
| 428 | "\n", PROGNAME, PROGNAME, default_gamma); |
| 429 | exit(1); |
| 430 | } |
| 431 | |
| 432 | |
| 433 | /* prepare the text buffers for libpng's use; note that even though |
| 434 | * PNG's png_text struct includes a length field, we don't have to fill |
| 435 | * it out */ |
| 436 | |
| 437 | if (text && |
| 438 | #ifndef DOS_OS2_W32 |
| 439 | (keybd = fdopen(fileno(stderr), "r")) != NULL && |
| 440 | #endif |
| 441 | (textbuf = (char *)malloc((5 + 9)*75)) != NULL) |
| 442 | { |
| 443 | int i, valid, result; |
| 444 | |
| 445 | fprintf(stderr, |
| 446 | "Enter text info (no more than 72 characters per line);\n"); |
| 447 | fprintf(stderr, "to skip a field, hit the <Enter> key.\n"); |
| 448 | /* note: just <Enter> leaves len == 1 */ |
| 449 | |
| 450 | do { |
| 451 | valid = TRUE; |
| 452 | p = textbuf + TEXT_TITLE_OFFSET; |
| 453 | fprintf(stderr, " Title: "); |
| 454 | fflush(stderr); |
| 455 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
| 456 | if (p[len-1] == '\n') |
| 457 | p[--len] = '\0'; |
| 458 | wpng_info.title = p; |
| 459 | wpng_info.have_text |= TEXT_TITLE; |
| 460 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 461 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 462 | " %u is %sdiscouraged by the PNG\n specification " |
| 463 | "[first occurrence was at character position #%d]\n", |
| 464 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 465 | result+1); |
| 466 | fflush(stderr); |
| 467 | #ifdef FORBID_LATIN1_CTRL |
| 468 | wpng_info.have_text &= ~TEXT_TITLE; |
| 469 | valid = FALSE; |
| 470 | #else |
| 471 | if (p[result] == 27) { /* escape character */ |
| 472 | wpng_info.have_text &= ~TEXT_TITLE; |
| 473 | valid = FALSE; |
| 474 | } |
| 475 | #endif |
| 476 | } |
| 477 | } |
| 478 | } while (!valid); |
| 479 | |
| 480 | do { |
| 481 | valid = TRUE; |
| 482 | p = textbuf + TEXT_AUTHOR_OFFSET; |
| 483 | fprintf(stderr, " Author: "); |
| 484 | fflush(stderr); |
| 485 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
| 486 | if (p[len-1] == '\n') |
| 487 | p[--len] = '\0'; |
| 488 | wpng_info.author = p; |
| 489 | wpng_info.have_text |= TEXT_AUTHOR; |
| 490 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 491 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 492 | " %u is %sdiscouraged by the PNG\n specification " |
| 493 | "[first occurrence was at character position #%d]\n", |
| 494 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 495 | result+1); |
| 496 | fflush(stderr); |
| 497 | #ifdef FORBID_LATIN1_CTRL |
| 498 | wpng_info.have_text &= ~TEXT_AUTHOR; |
| 499 | valid = FALSE; |
| 500 | #else |
| 501 | if (p[result] == 27) { /* escape character */ |
| 502 | wpng_info.have_text &= ~TEXT_AUTHOR; |
| 503 | valid = FALSE; |
| 504 | } |
| 505 | #endif |
| 506 | } |
| 507 | } |
| 508 | } while (!valid); |
| 509 | |
| 510 | do { |
| 511 | valid = TRUE; |
| 512 | p = textbuf + TEXT_DESC_OFFSET; |
| 513 | fprintf(stderr, " Description (up to 9 lines):\n"); |
| 514 | for (i = 1; i < 10; ++i) { |
| 515 | fprintf(stderr, " [%d] ", i); |
| 516 | fflush(stderr); |
| 517 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) |
| 518 | p += len; /* now points at NULL; char before is newline */ |
| 519 | else |
| 520 | break; |
| 521 | } |
| 522 | if ((len = p - (textbuf + TEXT_DESC_OFFSET)) > 1) { |
| 523 | if (p[-1] == '\n') { |
| 524 | p[-1] = '\0'; |
| 525 | --len; |
| 526 | } |
| 527 | wpng_info.desc = textbuf + TEXT_DESC_OFFSET; |
| 528 | wpng_info.have_text |= TEXT_DESC; |
| 529 | p = textbuf + TEXT_DESC_OFFSET; |
| 530 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 531 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 532 | " %u is %sdiscouraged by the PNG\n specification " |
| 533 | "[first occurrence was at character position #%d]\n", |
| 534 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 535 | result+1); |
| 536 | fflush(stderr); |
| 537 | #ifdef FORBID_LATIN1_CTRL |
| 538 | wpng_info.have_text &= ~TEXT_DESC; |
| 539 | valid = FALSE; |
| 540 | #else |
| 541 | if (p[result] == 27) { /* escape character */ |
| 542 | wpng_info.have_text &= ~TEXT_DESC; |
| 543 | valid = FALSE; |
| 544 | } |
| 545 | #endif |
| 546 | } |
| 547 | } |
| 548 | } while (!valid); |
| 549 | |
| 550 | do { |
| 551 | valid = TRUE; |
| 552 | p = textbuf + TEXT_COPY_OFFSET; |
| 553 | fprintf(stderr, " Copyright: "); |
| 554 | fflush(stderr); |
| 555 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
| 556 | if (p[len-1] == '\n') |
| 557 | p[--len] = '\0'; |
| 558 | wpng_info.copyright = p; |
| 559 | wpng_info.have_text |= TEXT_COPY; |
| 560 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 561 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 562 | " %u is %sdiscouraged by the PNG\n specification " |
| 563 | "[first occurrence was at character position #%d]\n", |
| 564 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 565 | result+1); |
| 566 | fflush(stderr); |
| 567 | #ifdef FORBID_LATIN1_CTRL |
| 568 | wpng_info.have_text &= ~TEXT_COPY; |
| 569 | valid = FALSE; |
| 570 | #else |
| 571 | if (p[result] == 27) { /* escape character */ |
| 572 | wpng_info.have_text &= ~TEXT_COPY; |
| 573 | valid = FALSE; |
| 574 | } |
| 575 | #endif |
| 576 | } |
| 577 | } |
| 578 | } while (!valid); |
| 579 | |
| 580 | do { |
| 581 | valid = TRUE; |
| 582 | p = textbuf + TEXT_EMAIL_OFFSET; |
| 583 | fprintf(stderr, " E-mail: "); |
| 584 | fflush(stderr); |
| 585 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
| 586 | if (p[len-1] == '\n') |
| 587 | p[--len] = '\0'; |
| 588 | wpng_info.email = p; |
| 589 | wpng_info.have_text |= TEXT_EMAIL; |
| 590 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 591 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 592 | " %u is %sdiscouraged by the PNG\n specification " |
| 593 | "[first occurrence was at character position #%d]\n", |
| 594 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 595 | result+1); |
| 596 | fflush(stderr); |
| 597 | #ifdef FORBID_LATIN1_CTRL |
| 598 | wpng_info.have_text &= ~TEXT_EMAIL; |
| 599 | valid = FALSE; |
| 600 | #else |
| 601 | if (p[result] == 27) { /* escape character */ |
| 602 | wpng_info.have_text &= ~TEXT_EMAIL; |
| 603 | valid = FALSE; |
| 604 | } |
| 605 | #endif |
| 606 | } |
| 607 | } |
| 608 | } while (!valid); |
| 609 | |
| 610 | do { |
| 611 | valid = TRUE; |
| 612 | p = textbuf + TEXT_URL_OFFSET; |
| 613 | fprintf(stderr, " URL: "); |
| 614 | fflush(stderr); |
| 615 | if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) { |
| 616 | if (p[len-1] == '\n') |
| 617 | p[--len] = '\0'; |
| 618 | wpng_info.url = p; |
| 619 | wpng_info.have_text |= TEXT_URL; |
| 620 | if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) { |
| 621 | fprintf(stderr, " " PROGNAME " warning: character code" |
| 622 | " %u is %sdiscouraged by the PNG\n specification " |
| 623 | "[first occurrence was at character position #%d]\n", |
| 624 | (unsigned)p[result], (p[result] == 27)? "strongly " : "", |
| 625 | result+1); |
| 626 | fflush(stderr); |
| 627 | #ifdef FORBID_LATIN1_CTRL |
| 628 | wpng_info.have_text &= ~TEXT_URL; |
| 629 | valid = FALSE; |
| 630 | #else |
| 631 | if (p[result] == 27) { /* escape character */ |
| 632 | wpng_info.have_text &= ~TEXT_URL; |
| 633 | valid = FALSE; |
| 634 | } |
| 635 | #endif |
| 636 | } |
| 637 | } |
| 638 | } while (!valid); |
| 639 | |
| 640 | #ifndef DOS_OS2_W32 |
| 641 | fclose(keybd); |
| 642 | #endif |
| 643 | |
| 644 | } else if (text) { |
| 645 | fprintf(stderr, PROGNAME ": unable to allocate memory for text\n"); |
| 646 | text = FALSE; |
| 647 | wpng_info.have_text = 0; |
| 648 | } |
| 649 | |
| 650 | |
| 651 | /* allocate libpng stuff, initialize transformations, write pre-IDAT data */ |
| 652 | |
| 653 | if ((rc = writepng_init(&wpng_info)) != 0) { |
| 654 | switch (rc) { |
| 655 | case 2: |
| 656 | fprintf(stderr, PROGNAME |
| 657 | ": libpng initialization problem (longjmp)\n"); |
| 658 | break; |
| 659 | case 4: |
| 660 | fprintf(stderr, PROGNAME ": insufficient memory\n"); |
| 661 | break; |
| 662 | case 11: |
| 663 | fprintf(stderr, PROGNAME |
| 664 | ": internal logic error (unexpected PNM type)\n"); |
| 665 | break; |
| 666 | default: |
| 667 | fprintf(stderr, PROGNAME |
| 668 | ": unknown writepng_init() error\n"); |
| 669 | break; |
| 670 | } |
| 671 | exit(rc); |
| 672 | } |
| 673 | |
| 674 | |
| 675 | /* free textbuf, since it's a completely local variable and all text info |
| 676 | * has just been written to the PNG file */ |
| 677 | |
| 678 | if (text && textbuf) { |
| 679 | free(textbuf); |
| 680 | textbuf = NULL; |
| 681 | } |
| 682 | |
| 683 | |
| 684 | /* calculate rowbytes on basis of image type; note that this becomes much |
| 685 | * more complicated if we choose to support PBM type, ASCII PNM types, or |
| 686 | * 16-bit-per-sample binary data [currently not an official NetPBM type] */ |
| 687 | |
| 688 | if (wpng_info.pnmtype == 5) |
| 689 | rowbytes = wpng_info.width; |
| 690 | else if (wpng_info.pnmtype == 6) |
| 691 | rowbytes = wpng_info.width * 3; |
| 692 | else /* if (wpng_info.pnmtype == 8) */ |
| 693 | rowbytes = wpng_info.width * 4; |
| 694 | |
| 695 | |
| 696 | /* read and write the image, either in its entirety (if writing interlaced |
| 697 | * PNG) or row by row (if non-interlaced) */ |
| 698 | |
| 699 | fprintf(stderr, "Encoding image data...\n"); |
| 700 | fflush(stderr); |
| 701 | |
| 702 | if (wpng_info.interlaced) { |
| 703 | long i; |
| 704 | ulg bytes; |
| 705 | ulg image_bytes = rowbytes * wpng_info.height; /* overflow? */ |
| 706 | |
| 707 | wpng_info.image_data = (uch *)malloc(image_bytes); |
| 708 | wpng_info.row_pointers = (uch **)malloc(wpng_info.height*sizeof(uch *)); |
| 709 | if (wpng_info.image_data == NULL || wpng_info.row_pointers == NULL) { |
| 710 | fprintf(stderr, PROGNAME ": insufficient memory for image data\n"); |
| 711 | writepng_cleanup(&wpng_info); |
| 712 | wpng_cleanup(); |
| 713 | exit(5); |
| 714 | } |
| 715 | for (i = 0; i < wpng_info.height; ++i) |
| 716 | wpng_info.row_pointers[i] = wpng_info.image_data + i*rowbytes; |
| 717 | bytes = fread(wpng_info.image_data, 1, image_bytes, wpng_info.infile); |
| 718 | if (bytes != image_bytes) { |
| 719 | fprintf(stderr, PROGNAME ": expected %lu bytes, got %lu bytes\n", |
| 720 | image_bytes, bytes); |
| 721 | fprintf(stderr, " (continuing anyway)\n"); |
| 722 | } |
| 723 | if (writepng_encode_image(&wpng_info) != 0) { |
| 724 | fprintf(stderr, PROGNAME |
| 725 | ": libpng problem (longjmp) while writing image data\n"); |
| 726 | writepng_cleanup(&wpng_info); |
| 727 | wpng_cleanup(); |
| 728 | exit(2); |
| 729 | } |
| 730 | |
| 731 | } else /* not interlaced: write progressively (row by row) */ { |
| 732 | long j; |
| 733 | ulg bytes; |
| 734 | |
| 735 | wpng_info.image_data = (uch *)malloc(rowbytes); |
| 736 | if (wpng_info.image_data == NULL) { |
| 737 | fprintf(stderr, PROGNAME ": insufficient memory for row data\n"); |
| 738 | writepng_cleanup(&wpng_info); |
| 739 | wpng_cleanup(); |
| 740 | exit(5); |
| 741 | } |
| 742 | error = 0; |
| 743 | for (j = wpng_info.height; j > 0L; --j) { |
| 744 | bytes = fread(wpng_info.image_data, 1, rowbytes, wpng_info.infile); |
| 745 | if (bytes != rowbytes) { |
| 746 | fprintf(stderr, PROGNAME |
| 747 | ": expected %lu bytes, got %lu bytes (row %ld)\n", rowbytes, |
| 748 | bytes, wpng_info.height-j); |
| 749 | ++error; |
| 750 | break; |
| 751 | } |
| 752 | if (writepng_encode_row(&wpng_info) != 0) { |
| 753 | fprintf(stderr, PROGNAME |
| 754 | ": libpng problem (longjmp) while writing row %ld\n", |
| 755 | wpng_info.height-j); |
| 756 | ++error; |
| 757 | break; |
| 758 | } |
| 759 | } |
| 760 | if (error) { |
| 761 | writepng_cleanup(&wpng_info); |
| 762 | wpng_cleanup(); |
| 763 | exit(2); |
| 764 | } |
| 765 | if (writepng_encode_finish(&wpng_info) != 0) { |
| 766 | fprintf(stderr, PROGNAME ": error on final libpng call\n"); |
| 767 | writepng_cleanup(&wpng_info); |
| 768 | wpng_cleanup(); |
| 769 | exit(2); |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | |
| 774 | /* OK, we're done (successfully): clean up all resources and quit */ |
| 775 | |
| 776 | fprintf(stderr, "Done.\n"); |
| 777 | fflush(stderr); |
| 778 | |
| 779 | writepng_cleanup(&wpng_info); |
| 780 | wpng_cleanup(); |
| 781 | |
| 782 | return 0; |
| 783 | } |
| 784 | |
| 785 | |
| 786 | |
| 787 | |
| 788 | |
| 789 | static int wpng_isvalid_latin1(uch *p, int len) |
| 790 | { |
| 791 | int i, result = -1; |
| 792 | |
| 793 | for (i = 0; i < len; ++i) { |
| 794 | if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160) |
| 795 | continue; /* character is completely OK */ |
| 796 | if (result < 0 || (p[result] != 27 && p[i] == 27)) |
| 797 | result = i; /* mark location of first questionable one */ |
| 798 | } /* or of first escape character (bad) */ |
| 799 | |
| 800 | return result; |
| 801 | } |
| 802 | |
| 803 | |
| 804 | |
| 805 | |
| 806 | |
| 807 | static void wpng_cleanup(void) |
| 808 | { |
| 809 | if (wpng_info.outfile) { |
| 810 | fclose(wpng_info.outfile); |
| 811 | wpng_info.outfile = NULL; |
| 812 | } |
| 813 | |
| 814 | if (wpng_info.infile) { |
| 815 | fclose(wpng_info.infile); |
| 816 | wpng_info.infile = NULL; |
| 817 | } |
| 818 | |
| 819 | if (wpng_info.image_data) { |
| 820 | free(wpng_info.image_data); |
| 821 | wpng_info.image_data = NULL; |
| 822 | } |
| 823 | |
| 824 | if (wpng_info.row_pointers) { |
| 825 | free(wpng_info.row_pointers); |
| 826 | wpng_info.row_pointers = NULL; |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | |
| 831 | |
| 832 | |
| 833 | #ifdef DOS_OS2_W32 |
| 834 | |
| 835 | static char *dos_kbd_gets(char *buf, int len) |
| 836 | { |
| 837 | int ch, count=0; |
| 838 | |
| 839 | do { |
| 840 | buf[count++] = ch = getche(); |
| 841 | } while (ch != '\r' && count < len-1); |
| 842 | |
| 843 | buf[count--] = '\0'; /* terminate string */ |
| 844 | if (buf[count] == '\r') /* Enter key makes CR, so change to newline */ |
| 845 | buf[count] = '\n'; |
| 846 | |
| 847 | fprintf(stderr, "\n"); /* Enter key does *not* cause a newline */ |
| 848 | fflush(stderr); |
| 849 | |
| 850 | return buf; |
| 851 | } |
| 852 | |
| 853 | #endif /* DOS_OS2_W32 */ |