pngminus: Improve portability and fix style
This commit is contained in:
Cosmin Truta
parent
1f0221fad7
commit
dcefbc7dcd
@ -1,12 +1,13 @@
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/*
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* png2pnm.c --- conversion from PNG-file to PGM/PPM-file
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* copyright (C) 1999,2017 by Willem van Schaik <willem at schaik.com>
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* copyright (C) 1999,2017,2018 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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* 1.1 - 2017.04.22 - Add buffer-size check (Glenn Randers-Pehrson)
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* 1.2 - 2017.08.24 - Fix potential overflow in buffer-size check
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* (Glenn Randers-Pehrson)
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* 1.3 - 2017.08.28 - Add PNGMINUS_UNUSED (Christian Hesse)
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* 1.4 - 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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@ -18,11 +19,7 @@
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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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@ -34,45 +31,25 @@
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#define FALSE (BOOL) 0
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#endif
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#ifdef __TURBOC__
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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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#endif
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/* to make png2pnm verbose so we can find problems (needs to be before png.h) */
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/* make png2pnm 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 png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw,
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BOOL alpha);
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BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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BOOL raw, BOOL alpha);
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/*
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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_wr = stdout;
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@ -99,21 +76,21 @@ int main(int argc, char *argv[])
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if ((fp_al = 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 alpha-channel file %s\n",
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argv[argi]);
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fprintf (stderr, "Error: cannot create alpha-channel file %s\n",
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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, "PNG2PNM\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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@ -121,9 +98,9 @@ int main(int argc, char *argv[])
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{
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if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
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{
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fprintf (stderr, "PNG2PNM\n");
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fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
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exit (1);
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fprintf (stderr, "PNG2PNM\n");
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fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
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exit (1);
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}
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}
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else if (fp_wr == stdout)
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@ -131,7 +108,7 @@ 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, "PNG2PNM\n");
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fprintf (stderr, "Error: can not create file %s\n", argv[argi]);
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fprintf (stderr, "Error: cannot create 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 +116,17 @@ int main(int argc, char *argv[])
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{
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fprintf (stderr, "PNG2PNM\n");
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fprintf (stderr, "Error: too many parameters\n");
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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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}
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} /* end for */
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#ifdef __TURBOC__
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#if defined(O_BINARY) && (O_BINARY != 0)
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/* set stdin/stdout if required to binary */
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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 ((raw) && (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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@ -161,7 +134,7 @@ int main(int argc, char *argv[])
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{
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fprintf (stderr, "PNG2PNM\n");
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fprintf (stderr, "Error: unsuccessful conversion of PNG-image\n");
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exit(1);
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exit (1);
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}
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/* close input file */
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@ -179,23 +152,18 @@ 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, "PNG2PNM\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: png2pnm [options] <file>.png [<file>.pnm]\n");
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fprintf (stderr, " or: ... | png2pnm [options]\n");
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fprintf (stderr, "Options:\n");
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fprintf (stderr,
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" -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
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" -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
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fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n");
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fprintf (stderr,
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" -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
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" -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
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fprintf (stderr, " -h | -? print this help-information\n");
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}
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@ -204,10 +172,10 @@ void usage()
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*/
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BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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volatile BOOL raw, BOOL alpha)
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BOOL raw, 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_info *info_ptr = NULL;
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png_byte buf[8];
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png_byte *png_pixels = NULL;
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png_byte **row_pointers = NULL;
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@ -231,24 +199,24 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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return FALSE;
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ret = png_sig_cmp (buf, 0, 8);
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if (ret)
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if (ret != 0)
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return FALSE;
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/* create png and info structures */
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png_ptr = png_create_read_struct (png_get_libpng_ver(NULL),
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NULL, NULL, NULL);
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NULL, NULL, NULL);
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if (!png_ptr)
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return FALSE; /* out of memory */
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return FALSE; /* out of memory */
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info_ptr = png_create_info_struct (png_ptr);
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if (!info_ptr)
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{
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png_destroy_read_struct (&png_ptr, NULL, NULL);
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return FALSE; /* out of memory */
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return FALSE; /* out of memory */
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}
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if (setjmp (png_jmpbuf(png_ptr)))
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if (setjmp (png_jmpbuf (png_ptr)))
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{
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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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return FALSE;
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@ -256,15 +224,14 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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/* set up the input control for C streams */
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png_init_io (png_ptr, png_file);
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png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */
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png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */
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/* read the file information */
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png_read_info (png_ptr, info_ptr);
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/* get size and bit-depth of the PNG-image */
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png_get_IHDR (png_ptr, info_ptr,
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&width, &height, &bit_depth, &color_type,
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NULL, NULL, NULL);
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png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
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NULL, NULL, NULL);
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/* set-up the transformations */
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@ -284,7 +251,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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png_set_strip_16 (png_ptr);
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/* transform grayscale images into full-color */
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb (png_ptr);
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/* only if file has a file gamma, we do a correction */
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if (png_get_gAMA (png_ptr, info_ptr, &file_gamma))
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@ -298,14 +265,14 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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/* get the new color-type and bit-depth (after expansion/stripping) */
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png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
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NULL, NULL, NULL);
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NULL, NULL, NULL);
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/* check for 16-bit files */
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if (bit_depth == 16)
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{
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raw = FALSE;
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#ifdef __TURBOC__
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pnm_file->flags &= ~((unsigned) _F_BIN);
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#if defined(O_BINARY) && (O_BINARY != 0)
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setmode (fileno (pnm_file), O_BINARY);
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#endif
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}
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@ -333,25 +300,25 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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/* row_bytes is the width x number of channels x (bit-depth / 8) */
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row_bytes = png_get_rowbytes (png_ptr, info_ptr);
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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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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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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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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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return FALSE;
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}
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if ((row_pointers = (png_byte **)
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malloc ((size_t)height * sizeof (png_bytep))) == NULL)
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malloc ((size_t) height * sizeof (png_byte *))) == NULL)
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{
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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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free (png_pixels);
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png_pixels = NULL;
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return FALSE;
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}
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@ -366,7 +333,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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png_read_end (png_ptr, info_ptr);
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/* clean up after the read, and free any memory allocated - REQUIRED */
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png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL);
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png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
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/* write header of PNM file */
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@ -406,14 +373,21 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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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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fputc ((int) *pix_ptr++ , pnm_file);
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{
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fputc ((int) *pix_ptr++, pnm_file);
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}
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else
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if (bit_depth == 16){
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{
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if (bit_depth == 16)
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{
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dep_16 = (long) *pix_ptr++;
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fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
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}
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else
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{
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fprintf (pnm_file, "%ld ", (long) *pix_ptr++);
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}
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}
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}
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if (alpha_present)
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{
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@ -426,17 +400,23 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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else /* output alpha-channel as pgm file */
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{
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if (raw)
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fputc ((int) *pix_ptr++ , alpha_file);
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{
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fputc ((int) *pix_ptr++, alpha_file);
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}
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else
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{
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if (bit_depth == 16)
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{
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dep_16 = (long) *pix_ptr++;
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fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
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}
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else
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{
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fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
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}
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}
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}
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} /* if alpha_present */
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} /* end if alpha_present */
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if (!raw)
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if (col % 4 == 3)
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@ -448,13 +428,11 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
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fprintf (pnm_file, "\n");
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} /* end for row */
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if (row_pointers != (unsigned char**) NULL)
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if (row_pointers != NULL)
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free (row_pointers);
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if (png_pixels != (unsigned char*) NULL)
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if (png_pixels != NULL)
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free (png_pixels);
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PNGMINUS_UNUSED(raw); /* to quiet a Coverity defect */
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return TRUE;
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} /* end of source */
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