source/libs/libpng/libpng-src/contrib/pngminus/pnm2png.c

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