pngminus: Improve portability and fix style (cont'd)
This commit is contained in:
Cosmin Truta
parent
dcefbc7dcd
commit
3f0f1d5579
@ -1,14 +1,15 @@
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/*
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* pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
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* copyright (C) 1999,2015,2017 by Willem van Schaik <willem at schaik.com>
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* copyright (C) 1999,2015,2017,2018 by Willem van Schaik <willem at schaik.com>
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*
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* version 1.0 - 1999.10.15 - First version.
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* version 1.1 - 2015.07.29 - Fixed leaks (Glenn Randers-Pehrson)
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* version 1.2 - 2017.04.22 - Add buffer-size check
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* 1.1 - 2015.07.29 - Fixed leaks (Glenn Randers-Pehrson)
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* 1.2 - 2017.04.22 - Add buffer-size check
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* 1.3 - 2017.08.24 - Fix potential overflow in buffer-size check
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* (Glenn Randers-Pehrson)
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* 1.4 - 2017.08.28 - Add PNGMINUS_UNUSED (Christian Hesse)
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* 1.5 - 2018.08.05 - Fix buffer overflow in tokenizer (Cosmin Truta)
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* 1.6 - 2018.08.05 - Improve portability and fix style (Cosmin Truta)
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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@ -20,11 +21,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __TURBOC__
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#include <mem.h>
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#include <fcntl.h>
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#endif
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#include <zlib.h>
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#ifndef BOOL
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#define BOOL unsigned char
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@ -36,38 +33,20 @@
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#define FALSE (BOOL) 0
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#endif
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#define STDIN 0
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#define STDOUT 1
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#define STDERR 2
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/* to make pnm2png verbose so we can find problems (needs to be before png.h) */
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/* make pnm2png verbose so we can find problems (needs to be before png.h) */
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#ifndef PNG_DEBUG
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#define PNG_DEBUG 0
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#endif
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#include "png.h"
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/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
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#ifndef png_jmpbuf
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# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
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#endif
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#ifndef PNGMINUS_UNUSED
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/* Unused formal parameter warnings are silenced using the following macro
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* which is expected to have no bad effects on performance (optimizing
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* compilers will probably remove it entirely).
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*/
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# define PNGMINUS_UNUSED(param) (void)param
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#endif
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/* function prototypes */
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int main (int argc, char *argv[]);
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int main (int argc, char *argv[]);
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void usage ();
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BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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BOOL alpha);
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void get_token(FILE *pnm_file, char *token_buf, size_t token_buf_size);
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BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file,
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BOOL interlace, BOOL alpha);
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void get_token (FILE *pnm_file, char *token_buf, size_t token_buf_size);
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png_uint_32 get_data (FILE *pnm_file, int depth);
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png_uint_32 get_value (FILE *pnm_file, int depth);
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@ -75,7 +54,7 @@ png_uint_32 get_value (FILE *pnm_file, int depth);
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* main
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*/
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int main(int argc, char *argv[])
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int main (int argc, char *argv[])
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{
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FILE *fp_rd = stdin;
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FILE *fp_al = NULL;
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@ -100,20 +79,20 @@ int main(int argc, char *argv[])
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{
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fprintf (stderr, "PNM2PNG\n");
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fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
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argv[argi]);
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argv[argi]);
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exit (1);
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}
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break;
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case 'h':
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case '?':
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usage();
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exit(0);
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usage ();
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exit (0);
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break;
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default:
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fprintf (stderr, "PNM2PNG\n");
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fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
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usage();
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exit(1);
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usage ();
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exit (1);
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break;
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} /* end switch */
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}
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@ -131,7 +110,7 @@ int main(int argc, char *argv[])
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if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
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{
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fprintf (stderr, "PNM2PNG\n");
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fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
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fprintf (stderr, "Error: cannot create PNG-file %s\n", argv[argi]);
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exit (1);
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}
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}
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@ -139,21 +118,19 @@ int main(int argc, char *argv[])
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{
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fprintf (stderr, "PNM2PNG\n");
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fprintf (stderr, "Error: too many parameters\n");
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usage();
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usage ();
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exit (1);
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}
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} /* end for */
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#ifdef __TURBOC__
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/* set stdin/stdout to binary, we're reading the PNM always! in binary format */
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#if defined(O_BINARY) && (O_BINARY != 0)
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/* set stdin/stdout to binary,
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* we're reading the PNM always! in binary format
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*/
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if (fp_rd == stdin)
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{
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setmode (STDIN, O_BINARY);
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}
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setmode (fileno (stdin), O_BINARY);
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if (fp_wr == stdout)
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{
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setmode (STDOUT, O_BINARY);
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}
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setmode (fileno (stdout), O_BINARY);
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#endif
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/* call the conversion program itself */
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@ -179,15 +156,10 @@ int main(int argc, char *argv[])
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* usage
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*/
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void usage()
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void usage ()
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{
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fprintf (stderr, "PNM2PNG\n");
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fprintf (stderr, " by Willem van Schaik, 1999\n");
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#ifdef __TURBOC__
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fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
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#else
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fprintf (stderr, " for Linux (and Unix) compilers\n");
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#endif
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fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
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fprintf (stderr, " or: ... | pnm2png [options]\n");
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fprintf (stderr, "Options:\n");
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@ -201,31 +173,31 @@ void usage()
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* pnm2png
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*/
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BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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BOOL alpha)
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BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file,
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BOOL interlace, BOOL alpha)
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{
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png_struct *png_ptr = NULL;
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png_info *info_ptr = NULL;
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png_byte *png_pixels = NULL;
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png_byte **row_pointers = NULL;
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png_byte *pix_ptr = NULL;
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volatile png_uint_32 row_bytes;
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volatile png_uint_32 row_bytes;
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char type_token[16];
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char width_token[16];
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char height_token[16];
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char maxval_token[16];
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volatile int color_type=1;
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unsigned long ul_width=0, ul_alpha_width=0;
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unsigned long ul_height=0, ul_alpha_height=0;
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unsigned long ul_maxval=0;
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volatile png_uint_32 width=0, height=0;
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volatile png_uint_32 alpha_width=0, alpha_height=0;
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volatile int color_type = 1;
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unsigned long ul_width = 0, ul_alpha_width = 0;
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unsigned long ul_height = 0, ul_alpha_height = 0;
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unsigned long ul_maxval = 0;
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volatile png_uint_32 width = 0, height = 0;
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volatile png_uint_32 alpha_width = 0, alpha_height = 0;
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png_uint_32 maxval;
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volatile int bit_depth = 0;
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int channels=0;
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volatile int bit_depth = 0;
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int channels = 0;
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int alpha_depth = 0;
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int alpha_present=0;
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int alpha_present = 0;
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int row, col;
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BOOL raw, alpha_raw = FALSE;
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#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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@ -236,7 +208,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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/* read header of PNM file */
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get_token(pnm_file, type_token, sizeof (type_token));
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get_token (pnm_file, type_token, sizeof (type_token));
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if (type_token[0] != 'P')
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{
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return FALSE;
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@ -246,30 +218,31 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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raw = (type_token[1] == '4');
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color_type = PNG_COLOR_TYPE_GRAY;
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get_token(pnm_file, width_token, sizeof (width_token));
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get_token (pnm_file, width_token, sizeof (width_token));
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sscanf (width_token, "%lu", &ul_width);
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width = (png_uint_32) ul_width;
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get_token(pnm_file, height_token, sizeof (height_token));
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get_token (pnm_file, height_token, sizeof (height_token));
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sscanf (height_token, "%lu", &ul_height);
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height = (png_uint_32) ul_height;
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bit_depth = 1;
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packed_bitmap = TRUE;
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#else
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fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
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fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and\n");
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fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
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return FALSE;
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#endif
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}
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else if ((type_token[1] == '2') || (type_token[1] == '5'))
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{
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raw = (type_token[1] == '5');
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color_type = PNG_COLOR_TYPE_GRAY;
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get_token(pnm_file, width_token, sizeof (width_token));
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get_token (pnm_file, width_token, sizeof (width_token));
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sscanf (width_token, "%lu", &ul_width);
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width = (png_uint_32) ul_width;
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get_token(pnm_file, height_token, sizeof (height_token));
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get_token (pnm_file, height_token, sizeof (height_token));
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sscanf (height_token, "%lu", &ul_height);
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height = (png_uint_32) ul_height;
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get_token(pnm_file, maxval_token, sizeof (maxval_token));
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get_token (pnm_file, maxval_token, sizeof (maxval_token));
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sscanf (maxval_token, "%lu", &ul_maxval);
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maxval = (png_uint_32) ul_maxval;
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@ -281,20 +254,22 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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bit_depth = 4;
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else if (maxval <= 255)
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bit_depth = 8;
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else /* if (maxval <= 65535) */
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else if (maxval <= 65535U)
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bit_depth = 16;
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else /* maxval > 65535U */
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return FALSE;
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}
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else if ((type_token[1] == '3') || (type_token[1] == '6'))
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{
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raw = (type_token[1] == '6');
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color_type = PNG_COLOR_TYPE_RGB;
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get_token(pnm_file, width_token, sizeof (width_token));
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get_token (pnm_file, width_token, sizeof (width_token));
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sscanf (width_token, "%lu", &ul_width);
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width = (png_uint_32) ul_width;
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get_token(pnm_file, height_token, sizeof (height_token));
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get_token (pnm_file, height_token, sizeof (height_token));
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sscanf (height_token, "%lu", &ul_height);
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height = (png_uint_32) ul_height;
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get_token(pnm_file, maxval_token, sizeof (maxval_token));
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get_token (pnm_file, maxval_token, sizeof (maxval_token));
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sscanf (maxval_token, "%lu", &ul_maxval);
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maxval = (png_uint_32) ul_maxval;
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if (maxval <= 1)
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@ -305,8 +280,10 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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bit_depth = 4;
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else if (maxval <= 255)
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bit_depth = 8;
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else /* if (maxval <= 65535) */
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else if (maxval <= 65535U)
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bit_depth = 16;
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else /* maxval > 65535U */
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return FALSE;
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}
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else
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{
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@ -322,7 +299,7 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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if (color_type == PNG_COLOR_TYPE_RGB)
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color_type = PNG_COLOR_TYPE_RGB_ALPHA;
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get_token(alpha_file, type_token, sizeof (type_token));
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get_token (alpha_file, type_token, sizeof (type_token));
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if (type_token[0] != 'P')
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{
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return FALSE;
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@ -330,17 +307,17 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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else if ((type_token[1] == '2') || (type_token[1] == '5'))
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{
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alpha_raw = (type_token[1] == '5');
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get_token(alpha_file, width_token, sizeof (width_token));
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get_token (alpha_file, width_token, sizeof (width_token));
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sscanf (width_token, "%lu", &ul_alpha_width);
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alpha_width=(png_uint_32) ul_alpha_width;
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alpha_width = (png_uint_32) ul_alpha_width;
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if (alpha_width != width)
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return FALSE;
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get_token(alpha_file, height_token, sizeof (height_token));
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get_token (alpha_file, height_token, sizeof (height_token));
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sscanf (height_token, "%lu", &ul_alpha_height);
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alpha_height = (png_uint_32) ul_alpha_height;
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if (alpha_height != height)
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return FALSE;
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get_token(alpha_file, maxval_token, sizeof (maxval_token));
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get_token (alpha_file, maxval_token, sizeof (maxval_token));
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sscanf (maxval_token, "%lu", &ul_maxval);
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maxval = (png_uint_32) ul_maxval;
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if (maxval <= 1)
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@ -351,8 +328,10 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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alpha_depth = 4;
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else if (maxval <= 255)
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alpha_depth = 8;
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else /* if (maxval <= 65535) */
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else if (maxval <= 65535U)
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alpha_depth = 16;
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else /* maxval > 65535U */
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return FALSE;
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if (alpha_depth != bit_depth)
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return FALSE;
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}
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@ -380,21 +359,29 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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if (packed_bitmap)
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{
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/* row data is as many bytes as can fit width x channels x bit_depth */
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row_bytes = (width * channels * bit_depth + 7) / 8;
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}
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else
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#endif
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/* row_bytes is the width x number of channels x (bit-depth / 8) */
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{
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/* row_bytes is the width x number of channels x (bit-depth / 8) */
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row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
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}
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if ((row_bytes == 0 || (size_t)height > ((size_t)(-1))/(size_t)row_bytes))
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if ((row_bytes == 0) ||
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((size_t) height > (size_t) (-1) / (size_t) row_bytes))
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{
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/* too big */
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return FALSE;
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}
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if ((png_pixels = (png_byte *)
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malloc ((size_t)row_bytes * (size_t)height * sizeof (png_byte))) == NULL)
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malloc ((size_t) row_bytes * (size_t) height)) == NULL)
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{
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/* out of memory */
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return FALSE;
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}
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/* read data from PNM file */
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pix_ptr = png_pixels;
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@ -405,9 +392,12 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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if (packed_bitmap)
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{
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for (i = 0; i < (int) row_bytes; i++)
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{
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/* png supports this format natively so no conversion is needed */
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*pix_ptr++ = get_data (pnm_file, 8);
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} else
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}
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}
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else
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#endif
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{
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for (col = 0; col < (int) width; col++)
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@ -415,10 +405,15 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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for (i = 0; i < (channels - alpha_present); i++)
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{
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if (raw)
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{
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*pix_ptr++ = get_data (pnm_file, bit_depth);
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}
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else
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{
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if (bit_depth <= 8)
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{
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*pix_ptr++ = get_value (pnm_file, bit_depth);
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}
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else
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{
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tmp16 = get_value (pnm_file, bit_depth);
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@ -427,41 +422,46 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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*pix_ptr = (png_byte) (tmp16 & 0xFF);
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pix_ptr++;
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}
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}
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}
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if (alpha) /* read alpha-channel from pgm file */
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{
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if (alpha_raw)
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{
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*pix_ptr++ = get_data (alpha_file, alpha_depth);
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}
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else
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{
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if (alpha_depth <= 8)
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{
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*pix_ptr++ = get_value (alpha_file, bit_depth);
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}
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else
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||||
{
|
||||
tmp16 = get_value (alpha_file, bit_depth);
|
||||
*pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
|
||||
*pix_ptr++ = (png_byte) (tmp16 & 0xFF);
|
||||
}
|
||||
} /* if alpha */
|
||||
} /* if packed_bitmap */
|
||||
}
|
||||
} /* end if alpha */
|
||||
} /* end if packed_bitmap */
|
||||
} /* end for col */
|
||||
} /* end for row */
|
||||
|
||||
/* prepare the standard PNG structures */
|
||||
png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
|
||||
NULL);
|
||||
png_ptr = png_create_write_struct (png_get_libpng_ver(NULL),
|
||||
NULL, NULL, NULL);
|
||||
if (!png_ptr)
|
||||
{
|
||||
free (png_pixels);
|
||||
png_pixels = NULL;
|
||||
return FALSE;
|
||||
}
|
||||
info_ptr = png_create_info_struct (png_ptr);
|
||||
if (!info_ptr)
|
||||
{
|
||||
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
|
||||
png_destroy_write_struct (&png_ptr, NULL);
|
||||
free (png_pixels);
|
||||
png_pixels = NULL;
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
@ -473,12 +473,10 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
|
||||
}
|
||||
#endif
|
||||
|
||||
/* setjmp() must be called in every function that calls a PNG-reading libpng function */
|
||||
if (setjmp (png_jmpbuf(png_ptr)))
|
||||
if (setjmp (png_jmpbuf (png_ptr)))
|
||||
{
|
||||
png_destroy_write_struct (&png_ptr, &info_ptr);
|
||||
free (png_pixels);
|
||||
png_pixels = NULL;
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
@ -487,21 +485,20 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
|
||||
|
||||
/* we're going to write more or less the same PNG as the input file */
|
||||
png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
|
||||
(!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
|
||||
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
||||
(!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
|
||||
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
||||
|
||||
/* write the file header information */
|
||||
png_write_info (png_ptr, info_ptr);
|
||||
|
||||
/* if needed we will allocate memory for an new array of row-pointers */
|
||||
if (row_pointers == (unsigned char**) NULL)
|
||||
if (row_pointers == NULL)
|
||||
{
|
||||
if ((row_pointers = (png_byte **)
|
||||
malloc (height * sizeof (png_bytep))) == NULL)
|
||||
malloc (height * sizeof (png_byte *))) == NULL)
|
||||
{
|
||||
png_destroy_write_struct (&png_ptr, &info_ptr);
|
||||
free (png_pixels);
|
||||
png_pixels = NULL;
|
||||
return FALSE;
|
||||
}
|
||||
}
|
||||
@ -519,21 +516,19 @@ BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
|
||||
/* clean up after the write, and free any memory allocated */
|
||||
png_destroy_write_struct (&png_ptr, &info_ptr);
|
||||
|
||||
if (row_pointers != (unsigned char**) NULL)
|
||||
if (row_pointers != NULL)
|
||||
free (row_pointers);
|
||||
if (png_pixels != (unsigned char*) NULL)
|
||||
if (png_pixels != NULL)
|
||||
free (png_pixels);
|
||||
|
||||
PNGMINUS_UNUSED(raw); /* Quiet a Coverity defect */
|
||||
|
||||
return TRUE;
|
||||
} /* end of pnm2png */
|
||||
|
||||
/*
|
||||
* get_token() - gets the first string after whitespace
|
||||
* get_token - gets the first string after whitespace
|
||||
*/
|
||||
|
||||
void get_token(FILE *pnm_file, char *token_buf, size_t token_buf_size)
|
||||
void get_token (FILE *pnm_file, char *token_buf, size_t token_buf_size)
|
||||
{
|
||||
size_t i = 0;
|
||||
int ret;
|
||||
@ -541,13 +536,13 @@ void get_token(FILE *pnm_file, char *token_buf, size_t token_buf_size)
|
||||
/* remove white-space and comment lines */
|
||||
do
|
||||
{
|
||||
ret = fgetc(pnm_file);
|
||||
ret = fgetc (pnm_file);
|
||||
if (ret == '#')
|
||||
{
|
||||
/* the rest of this line is a comment */
|
||||
do
|
||||
{
|
||||
ret = fgetc(pnm_file);
|
||||
ret = fgetc (pnm_file);
|
||||
}
|
||||
while ((ret != '\n') && (ret != '\r') && (ret != EOF));
|
||||
}
|
||||
@ -559,7 +554,7 @@ void get_token(FILE *pnm_file, char *token_buf, size_t token_buf_size)
|
||||
/* read string */
|
||||
do
|
||||
{
|
||||
ret = fgetc(pnm_file);
|
||||
ret = fgetc (pnm_file);
|
||||
if (ret == EOF) break;
|
||||
if (++i == token_buf_size - 1) break;
|
||||
token_buf[i] = (char) ret;
|
||||
@ -572,9 +567,9 @@ void get_token(FILE *pnm_file, char *token_buf, size_t token_buf_size)
|
||||
}
|
||||
|
||||
/*
|
||||
* get_data() - takes first byte and converts into next pixel value,
|
||||
* taking as much bits as defined by bit-depth and
|
||||
* using the bit-depth to fill up a byte (0Ah -> AAh)
|
||||
* get_data - takes first byte and converts into next pixel value,
|
||||
* taking as much bits as defined by bit-depth and
|
||||
* using the bit-depth to fill up a byte (0Ah -> AAh)
|
||||
*/
|
||||
|
||||
png_uint_32 get_data (FILE *pnm_file, int depth)
|
||||
@ -606,8 +601,8 @@ png_uint_32 get_data (FILE *pnm_file, int depth)
|
||||
}
|
||||
|
||||
/*
|
||||
* get_value() - takes first (numeric) string and converts into number,
|
||||
* using the bit-depth to fill up a byte (0Ah -> AAh)
|
||||
* get_value - takes first (numeric) string and converts into number,
|
||||
* using the bit-depth to fill up a byte (0Ah -> AAh)
|
||||
*/
|
||||
|
||||
png_uint_32 get_value (FILE *pnm_file, int depth)
|
||||
@ -636,4 +631,3 @@ png_uint_32 get_value (FILE *pnm_file, int depth)
|
||||
}
|
||||
|
||||
/* end of source */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user