workbench/libs/png/contrib/pngminus/pnm2png.c

   1 /*
   2  *  pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
   3  *  copyright (C) 1999,2015,2017 by Willem van Schaik <willem at schaik.com>
   4  *
   5  *  version 1.0 - 1999.10.15 - First version.
   6  *  version 1.1 - 2015.07.29 - Fixed leaks (Glenn Randers-Pehrson)
   7  *  version 1.2 - 2017.04.22 - Add buffer-size check
   8  *          1.3 - 2017.08.24 - Fix potential overflow in buffer-size check
   9  *                             (Glenn Randers-Pehrson)
  10  *          1.4 - 2017.08.28 - Add PNGMINUS_UNUSED (Christian Hesse)
  11  *
  12  *  Permission to use, copy, modify, and distribute this software and
  13  *  its documentation for any purpose and without fee is hereby granted,
  14  *  provided that the above copyright notice appear in all copies and
  15  *  that both that copyright notice and this permission notice appear in
  16  *  supporting documentation. This software is provided "as is" without
  17  *  express or implied warranty.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #ifdef __TURBOC__
  23 #include <mem.h>
  24 #include <fcntl.h>
  25 #endif
  26 #include <zlib.h>
  27
  28 #ifndef BOOL
  29 #define BOOL unsigned char
  30 #endif
  31 #ifndef TRUE
  32 #define TRUE (BOOL) 1
  33 #endif
  34 #ifndef FALSE
  35 #define FALSE (BOOL) 0
  36 #endif
  37
  38 #define STDIN  0
  39 #define STDOUT 1
  40 #define STDERR 2
  41
  42 /* to make pnm2png verbose so we can find problems (needs to be before png.h) */
  43 #ifndef PNG_DEBUG
  44 #define PNG_DEBUG 0
  45 #endif
  46
  47 #include "png.h"
  48
  49 /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
  50 #ifndef png_jmpbuf
  51 #  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
  52 #endif
  53
  54 #ifndef PNGMINUS_UNUSED
  55 /* Unused formal parameter warnings are silenced using the following macro
  56  * which is expected to have no bad effects on performance (optimizing
  57  * compilers will probably remove it entirely).
  58  */
  59 #  define PNGMINUS_UNUSED(param) (void)param
  60 #endif
  61
  62
  63 /* function prototypes */
  64
  65 int  main (int argc, char *argv[]);
  66 void usage ();
  67 BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
  68     BOOL alpha);
  69 void get_token(FILE *pnm_file, char *token);
  70 png_uint_32 get_data (FILE *pnm_file, int depth);
  71 png_uint_32 get_value (FILE *pnm_file, int depth);
  72
  73 /*
  74  *  main
  75  */
  76
  77 int main(int argc, char *argv[])
  78 {
  79   FILE *fp_rd = stdin;
  80   FILE *fp_al = NULL;
  81   FILE *fp_wr = stdout;
  82   BOOL interlace = FALSE;
  83   BOOL alpha = FALSE;
  84   int argi;
  85
  86   for (argi = 1; argi < argc; argi++)
  87   {
  88     if (argv[argi][0] == '-')
  89     {
  90       switch (argv[argi][1])
  91       {
  92         case 'i':
  93           interlace = TRUE;
  94           break;
  95         case 'a':
  96           alpha = TRUE;
  97           argi++;
  98           if ((fp_al = fopen (argv[argi], "rb")) == NULL)
  99           {
 100             fprintf (stderr, "PNM2PNG\n");
 101             fprintf (stderr, "Error:  alpha-channel file %s does not exist\n",
 102                argv[argi]);
 103             exit (1);
 104           }
 105           break;
 106         case 'h':
 107         case '?':
 108           usage();
 109           exit(0);
 110           break;
 111         default:
 112           fprintf (stderr, "PNM2PNG\n");
 113           fprintf (stderr, "Error:  unknown option %s\n", argv[argi]);
 114           usage();
 115           exit(1);
 116           break;
 117       } /* end switch */
 118     }
 119     else if (fp_rd == stdin)
 120     {
 121       if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
 122       {
 123         fprintf (stderr, "PNM2PNG\n");
 124         fprintf (stderr, "Error:  file %s does not exist\n", argv[argi]);
 125         exit (1);
 126       }
 127     }
 128     else if (fp_wr == stdout)
 129     {
 130       if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
 131       {
 132         fprintf (stderr, "PNM2PNG\n");
 133         fprintf (stderr, "Error:  can not create PNG-file %s\n", argv[argi]);
 134         exit (1);
 135       }
 136     }
 137     else
 138     {
 139       fprintf (stderr, "PNM2PNG\n");
 140       fprintf (stderr, "Error:  too many parameters\n");
 141       usage();
 142       exit (1);
 143     }
 144   } /* end for */
 145
 146 #ifdef __TURBOC__
 147   /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
 148   if (fp_rd == stdin)
 149   {
 150     setmode (STDIN, O_BINARY);
 151   }
 152   if (fp_wr == stdout)
 153   {
 154     setmode (STDOUT, O_BINARY);
 155   }
 156 #endif
 157
 158   /* call the conversion program itself */
 159   if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
 160   {
 161     fprintf (stderr, "PNM2PNG\n");
 162     fprintf (stderr, "Error:  unsuccessful converting to PNG-image\n");
 163     exit (1);
 164   }
 165
 166   /* close input file */
 167   fclose (fp_rd);
 168   /* close output file */
 169   fclose (fp_wr);
 170   /* close alpha file */
 171   if (alpha)
 172     fclose (fp_al);
 173
 174   return 0;
 175 }
 176
 177 /*
 178  *  usage
 179  */
 180
 181 void usage()
 182 {
 183   fprintf (stderr, "PNM2PNG\n");
 184   fprintf (stderr, "   by Willem van Schaik, 1999\n");
 185 #ifdef __TURBOC__
 186   fprintf (stderr, "   for Turbo-C and Borland-C compilers\n");
 187 #else
 188   fprintf (stderr, "   for Linux (and Unix) compilers\n");
 189 #endif
 190   fprintf (stderr, "Usage:  pnm2png [options] <file>.<pnm> [<file>.png]\n");
 191   fprintf (stderr, "   or:  ... | pnm2png [options]\n");
 192   fprintf (stderr, "Options:\n");
 193   fprintf (stderr, "   -i[nterlace]   write png-file with interlacing on\n");
 194   fprintf (stderr,
 195       "   -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
 196   fprintf (stderr, "   -h | -?  print this help-information\n");
 197 }
 198
 199 /*
 200  *  pnm2png
 201  */
 202
 203 BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
 204      BOOL alpha)
 205 {
 206   png_struct    *png_ptr = NULL;
 207   png_info      *info_ptr = NULL;
 208   png_byte      *png_pixels = NULL;
 209   png_byte      **row_pointers = NULL;
 210   png_byte      *pix_ptr = NULL;
 211   volatile png_uint_32   row_bytes;
 212
 213   char          type_token[16];
 214   char          width_token[16];
 215   char          height_token[16];
 216   char          maxval_token[16];
 217   volatile int    color_type=1;
 218   unsigned long   ul_width=0, ul_alpha_width=0;
 219   unsigned long   ul_height=0, ul_alpha_height=0;
 220   unsigned long   ul_maxval=0;
 221   volatile png_uint_32   width=0, height=0;
 222   volatile png_uint_32   alpha_width=0, alpha_height=0;
 223   png_uint_32   maxval;
 224   volatile int           bit_depth = 0;
 225   int           channels=0;
 226   int           alpha_depth = 0;
 227   int           alpha_present=0;
 228   int           row, col;
 229   BOOL          raw, alpha_raw = FALSE;
 230 #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 231   BOOL          packed_bitmap = FALSE;
 232 #endif
 233   png_uint_32   tmp16;
 234   int           i;
 235
 236   /* read header of PNM file */
 237
 238   get_token(pnm_file, type_token);
 239   if (type_token[0] != 'P')
 240   {
 241     return FALSE;
 242   }
 243   else if ((type_token[1] == '1') || (type_token[1] == '4'))
 244   {
 245 #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 246     raw = (type_token[1] == '4');
 247     color_type = PNG_COLOR_TYPE_GRAY;
 248     get_token(pnm_file, width_token);
 249     sscanf (width_token, "%lu", &ul_width);
 250     width = (png_uint_32) ul_width;
 251     get_token(pnm_file, height_token);
 252     sscanf (height_token, "%lu", &ul_height);
 253     height = (png_uint_32) ul_height;
 254     bit_depth = 1;
 255     packed_bitmap = TRUE;
 256 #else
 257     fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
 258     fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
 259 #endif
 260   }
 261   else if ((type_token[1] == '2') || (type_token[1] == '5'))
 262   {
 263     raw = (type_token[1] == '5');
 264     color_type = PNG_COLOR_TYPE_GRAY;
 265     get_token(pnm_file, width_token);
 266     sscanf (width_token, "%lu", &ul_width);
 267     width = (png_uint_32) ul_width;
 268     get_token(pnm_file, height_token);
 269     sscanf (height_token, "%lu", &ul_height);
 270     height = (png_uint_32) ul_height;
 271     get_token(pnm_file, maxval_token);
 272     sscanf (maxval_token, "%lu", &ul_maxval);
 273     maxval = (png_uint_32) ul_maxval;
 274
 275     if (maxval <= 1)
 276       bit_depth = 1;
 277     else if (maxval <= 3)
 278       bit_depth = 2;
 279     else if (maxval <= 15)
 280       bit_depth = 4;
 281     else if (maxval <= 255)
 282       bit_depth = 8;
 283     else /* if (maxval <= 65535) */
 284       bit_depth = 16;
 285   }
 286   else if ((type_token[1] == '3') || (type_token[1] == '6'))
 287   {
 288     raw = (type_token[1] == '6');
 289     color_type = PNG_COLOR_TYPE_RGB;
 290     get_token(pnm_file, width_token);
 291     sscanf (width_token, "%lu", &ul_width);
 292     width = (png_uint_32) ul_width;
 293     get_token(pnm_file, height_token);
 294     sscanf (height_token, "%lu", &ul_height);
 295     height = (png_uint_32) ul_height;
 296     get_token(pnm_file, maxval_token);
 297     sscanf (maxval_token, "%lu", &ul_maxval);
 298     maxval = (png_uint_32) ul_maxval;
 299     if (maxval <= 1)
 300       bit_depth = 1;
 301     else if (maxval <= 3)
 302       bit_depth = 2;
 303     else if (maxval <= 15)
 304       bit_depth = 4;
 305     else if (maxval <= 255)
 306       bit_depth = 8;
 307     else /* if (maxval <= 65535) */
 308       bit_depth = 16;
 309   }
 310   else
 311   {
 312     return FALSE;
 313   }
 314
 315   /* read header of PGM file with alpha channel */
 316
 317   if (alpha)
 318   {
 319     if (color_type == PNG_COLOR_TYPE_GRAY)
 320       color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
 321     if (color_type == PNG_COLOR_TYPE_RGB)
 322       color_type = PNG_COLOR_TYPE_RGB_ALPHA;
 323
 324     get_token(alpha_file, type_token);
 325     if (type_token[0] != 'P')
 326     {
 327       return FALSE;
 328     }
 329     else if ((type_token[1] == '2') || (type_token[1] == '5'))
 330     {
 331       alpha_raw = (type_token[1] == '5');
 332       get_token(alpha_file, width_token);
 333       sscanf (width_token, "%lu", &ul_alpha_width);
 334       alpha_width=(png_uint_32) ul_alpha_width;
 335       if (alpha_width != width)
 336         return FALSE;
 337       get_token(alpha_file, height_token);
 338       sscanf (height_token, "%lu", &ul_alpha_height);
 339       alpha_height = (png_uint_32) ul_alpha_height;
 340       if (alpha_height != height)
 341         return FALSE;
 342       get_token(alpha_file, maxval_token);
 343       sscanf (maxval_token, "%lu", &ul_maxval);
 344       maxval = (png_uint_32) ul_maxval;
 345       if (maxval <= 1)
 346         alpha_depth = 1;
 347       else if (maxval <= 3)
 348         alpha_depth = 2;
 349       else if (maxval <= 15)
 350         alpha_depth = 4;
 351       else if (maxval <= 255)
 352         alpha_depth = 8;
 353       else /* if (maxval <= 65535) */
 354         alpha_depth = 16;
 355       if (alpha_depth != bit_depth)
 356         return FALSE;
 357     }
 358     else
 359     {
 360       return FALSE;
 361     }
 362   } /* end if alpha */
 363
 364   /* calculate the number of channels and store alpha-presence */
 365   if (color_type == PNG_COLOR_TYPE_GRAY)
 366     channels = 1;
 367   else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
 368     channels = 2;
 369   else if (color_type == PNG_COLOR_TYPE_RGB)
 370     channels = 3;
 371   else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
 372     channels = 4;
 373 #if 0
 374   else
 375     channels = 0; /* cannot happen */
 376 #endif
 377
 378   alpha_present = (channels - 1) % 2;
 379
 380 #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 381   if (packed_bitmap)
 382     /* row data is as many bytes as can fit width x channels x bit_depth */
 383     row_bytes = (width * channels * bit_depth + 7) / 8;
 384   else
 385 #endif
 386   /* row_bytes is the width x number of channels x (bit-depth / 8) */
 387     row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
 388
 389   if ((row_bytes == 0 || (size_t)height > ((size_t)(-1))/(size_t)row_bytes))
 390   {
 391     /* too big */
 392     return FALSE;
 393   }
 394   if ((png_pixels = (png_byte *)
 395      malloc ((size_t)row_bytes * (size_t)height * sizeof (png_byte))) == NULL)
 396     return FALSE;
 397
 398   /* read data from PNM file */
 399   pix_ptr = png_pixels;
 400
 401   for (row = 0; row < (int) height; row++)
 402   {
 403 #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 404     if (packed_bitmap)
 405     {
 406       for (i = 0; i < (int) row_bytes; i++)
 407         /* png supports this format natively so no conversion is needed */
 408         *pix_ptr++ = get_data (pnm_file, 8);
 409     } else
 410 #endif
 411     {
 412       for (col = 0; col < (int) width; col++)
 413       {
 414         for (i = 0; i < (channels - alpha_present); i++)
 415         {
 416           if (raw)
 417             *pix_ptr++ = get_data (pnm_file, bit_depth);
 418           else
 419             if (bit_depth <= 8)
 420               *pix_ptr++ = get_value (pnm_file, bit_depth);
 421             else
 422             {
 423               tmp16 = get_value (pnm_file, bit_depth);
 424               *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
 425               pix_ptr++;
 426               *pix_ptr = (png_byte) (tmp16 & 0xFF);
 427               pix_ptr++;
 428             }
 429         }
 430
 431         if (alpha) /* read alpha-channel from pgm file */
 432         {
 433           if (alpha_raw)
 434             *pix_ptr++ = get_data (alpha_file, alpha_depth);
 435           else
 436             if (alpha_depth <= 8)
 437               *pix_ptr++ = get_value (alpha_file, bit_depth);
 438             else
 439             {
 440               tmp16 = get_value (alpha_file, bit_depth);
 441               *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
 442               *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
 443             }
 444         } /* if alpha */
 445       } /* if packed_bitmap */
 446     } /* end for col */
 447   } /* end for row */
 448
 449   /* prepare the standard PNG structures */
 450   png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
 451       NULL);
 452   if (!png_ptr)
 453   {
 454     free (png_pixels);
 455     png_pixels = NULL;
 456     return FALSE;
 457   }
 458   info_ptr = png_create_info_struct (png_ptr);
 459   if (!info_ptr)
 460   {
 461     png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
 462     free (png_pixels);
 463     png_pixels = NULL;
 464     return FALSE;
 465   }
 466
 467 #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 468   if (packed_bitmap == TRUE)
 469   {
 470     png_set_packing (png_ptr);
 471     png_set_invert_mono (png_ptr);
 472   }
 473 #endif
 474
 475   /* setjmp() must be called in every function that calls a PNG-reading libpng function */
 476   if (setjmp (png_jmpbuf(png_ptr)))
 477   {
 478     png_destroy_write_struct (&png_ptr, &info_ptr);
 479     free (png_pixels);
 480     png_pixels = NULL;
 481     return FALSE;
 482   }
 483
 484   /* initialize the png structure */
 485   png_init_io (png_ptr, png_file);
 486
 487   /* we're going to write more or less the same PNG as the input file */
 488   png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
 489     (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
 490     PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 491
 492   /* write the file header information */
 493   png_write_info (png_ptr, info_ptr);
 494
 495   /* if needed we will allocate memory for an new array of row-pointers */
 496   if (row_pointers == (unsigned char**) NULL)
 497   {
 498     if ((row_pointers = (png_byte **)
 499         malloc (height * sizeof (png_bytep))) == NULL)
 500     {
 501       png_destroy_write_struct (&png_ptr, &info_ptr);
 502       free (png_pixels);
 503       png_pixels = NULL;
 504       return FALSE;
 505     }
 506   }
 507
 508   /* set the individual row_pointers to point at the correct offsets */
 509   for (i = 0; i < (int) height; i++)
 510     row_pointers[i] = png_pixels + i * row_bytes;
 511
 512   /* write out the entire image data in one call */
 513   png_write_image (png_ptr, row_pointers);
 514
 515   /* write the additional chunks to the PNG file (not really needed) */
 516   png_write_end (png_ptr, info_ptr);
 517
 518   /* clean up after the write, and free any memory allocated */
 519   png_destroy_write_struct (&png_ptr, &info_ptr);
 520
 521   if (row_pointers != (unsigned char**) NULL)
 522     free (row_pointers);
 523   if (png_pixels != (unsigned char*) NULL)
 524     free (png_pixels);
 525
 526   PNGMINUS_UNUSED(raw); /* Quiet a Coverity defect */
 527
 528   return TRUE;
 529 } /* end of pnm2png */
 530
 531 /*
 532  * get_token() - gets the first string after whitespace
 533  */
 534
 535 void get_token(FILE *pnm_file, char *token)
 536 {
 537   int i = 0;
 538   int ret;
 539
 540   /* remove white-space and comment lines */
 541   do
 542   {
 543     ret = fgetc(pnm_file);
 544     if (ret == '#')
 545     {
 546       /* the rest of this line is a comment */
 547       do
 548       {
 549         ret = fgetc(pnm_file);
 550       }
 551       while ((ret != '\n') && (ret != '\r') && (ret != EOF));
 552     }
 553     if (ret == EOF) break;
 554     token[i] = (unsigned char) ret;
 555   }
 556   while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
 557
 558   /* read string */
 559   do
 560   {
 561     ret = fgetc(pnm_file);
 562     if (ret == EOF) break;
 563     i++;
 564     token[i] = (unsigned char) ret;
 565   }
 566   while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
 567
 568   token[i] = '\0';
 569
 570   return;
 571 }
 572
 573 /*
 574  * get_data() - takes first byte and converts into next pixel value,
 575  *        taking as much bits as defined by bit-depth and
 576  *        using the bit-depth to fill up a byte (0Ah -> AAh)
 577  */
 578
 579 png_uint_32 get_data (FILE *pnm_file, int depth)
 580 {
 581   static int bits_left = 0;
 582   static int old_value = 0;
 583   static int mask = 0;
 584   int i;
 585   png_uint_32 ret_value;
 586
 587   if (mask == 0)
 588     for (i = 0; i < depth; i++)
 589       mask = (mask >> 1) | 0x80;
 590
 591   if (bits_left <= 0)
 592   {
 593     old_value = fgetc (pnm_file);
 594     bits_left = 8;
 595   }
 596
 597   ret_value = old_value & mask;
 598   for (i = 1; i < (8 / depth); i++)
 599     ret_value = ret_value || (ret_value >> depth);
 600
 601   old_value = (old_value << depth) & 0xFF;
 602   bits_left -= depth;
 603
 604   return ret_value;
 605 }
 606
 607 /*
 608  * get_value() - takes first (numeric) string and converts into number,
 609  *         using the bit-depth to fill up a byte (0Ah -> AAh)
 610  */
 611
 612 png_uint_32 get_value (FILE *pnm_file, int depth)
 613 {
 614   static png_uint_32 mask = 0;
 615   png_byte token[16];
 616   unsigned long ul_ret_value;
 617   png_uint_32 ret_value;
 618   int i = 0;
 619
 620   if (mask == 0)
 621     for (i = 0; i < depth; i++)
 622       mask = (mask << 1) | 0x01;
 623
 624   get_token (pnm_file, (char *) token);
 625   sscanf ((const char *) token, "%lu", &ul_ret_value);
 626   ret_value = (png_uint_32) ul_ret_value;
 627
 628   ret_value &= mask;
 629
 630   if (depth < 8)
 631     for (i = 0; i < (8 / depth); i++)
 632       ret_value = (ret_value << depth) || ret_value;
 633
 634   return ret_value;
 635 }
 636
 637 /* end of source */
 638