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[libpng17] Imported from libpng-1.7.0beta88.tar

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Glenn Randers-Pehrson
2017-08-18 03:15:17 -05:00
parent 1c2e35ab73
commit 0b2b7d8ab5
20 changed files with 85 additions and 50 deletions
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47
contrib/pngminus/png2pnm.c
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@@ -1,8 +1,11 @@
/*
* png2pnm.c --- conversion from PNG-file to PGM/PPM-file
* copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
* copyright (C) 1999,2017 by Willem van Schaik <willem at schaik.com>
*
* version 1.0 - 1999.10.15 - First version.
* 1.1 - 2017.04.22 - Add buffer-size check (Glenn Randers-Pehrson)
* 1.2 - 2017.08.24 - Fix potential overflow in buffer-size check
(Glenn Randers-Pehrson)
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
@@ -52,7 +55,8 @@
int main (int argc, char *argv[]);
void usage ();
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha);
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw,
BOOL alpha);
/*
* main
@@ -85,7 +89,8 @@ int main(int argc, char *argv[])
if ((fp_al = fopen (argv[argi], "wb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: can not create alpha-channel file %s\n", argv[argi]);
fprintf (stderr, "Error: can not create alpha-channel file %s\n",
argv[argi]);
exit (1);
}
break;
@@ -176,9 +181,11 @@ void usage()
fprintf (stderr, "Usage: png2pnm [options] <file>.png [<file>.pnm]\n");
fprintf (stderr, " or: ... | png2pnm [options]\n");
fprintf (stderr, "Options:\n");
fprintf (stderr, " -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
fprintf (stderr,
" -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n");
fprintf (stderr, " -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
fprintf (stderr,
" -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
fprintf (stderr, " -h | -? print this help-information\n");
}
@@ -186,7 +193,8 @@ void usage()
* png2pnm
*/
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL alpha)
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
volatile BOOL raw, BOOL alpha)
{
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
@@ -218,7 +226,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
/* create png and info structures */
png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING,
png_ptr = png_create_read_struct (png_get_libpng_ver(NULL),
NULL, NULL, NULL);
if (!png_ptr)
return FALSE; /* out of memory */
@@ -261,7 +269,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
png_set_expand (png_ptr);
#ifdef NJET
/* downgrade 16-bit images to 8 bit */
/* downgrade 16-bit images to 8-bit */
if (bit_depth == 16)
png_set_strip_16 (png_ptr);
/* transform grayscale images into full-color */
@@ -315,12 +323,21 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
/* row_bytes is the width x number of channels x (bit-depth / 8) */
row_bytes = png_get_rowbytes (png_ptr, info_ptr);
if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL) {
if ((row_bytes == 0 || (size_t)height > ((size_t)(-1))/(size_t)row_bytes))
{
/* too big */
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return FALSE;
}
if ((png_pixels = (png_byte *)
malloc ((size_t)row_bytes * (size_t)height * sizeof (png_byte))) == NULL)
{
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return FALSE;
}
if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
if ((row_pointers = (png_byte **)
malloc ((size_t)height * sizeof (png_bytep))) == NULL)
{
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
free (png_pixels);
@@ -329,7 +346,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
}
/* set the individual row_pointers to point at the correct offsets */
for (i = 0; i < (height); i++)
for (i = 0; i < ((int) height); i++)
row_pointers[i] = png_pixels + i * row_bytes;
/* now we can go ahead and just read the whole image */
@@ -372,9 +389,9 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
/* write data to PNM file */
pix_ptr = png_pixels;
for (row = 0; row < height; row++)
for (row = 0; row < (int) height; row++)
{
for (col = 0; col < width; col++)
for (col = 0; col < (int) width; col++)
{
for (i = 0; i < (channels - alpha_present); i++)
{
@@ -401,7 +418,8 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
if (raw)
fputc ((int) *pix_ptr++ , alpha_file);
else
if (bit_depth == 16){
if (bit_depth == 16)
{
dep_16 = (long) *pix_ptr++;
fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
}
@@ -425,6 +443,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
if (png_pixels != (unsigned char*) NULL)
free (png_pixels);
PNG_UNUSED(raw) /* to quiet a Coverity defect */
return TRUE;
} /* end of source */