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[libpng16] Do not build png_product2() when it is unused.

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Work around more Coverity-scan dead-code warnings.
This commit is contained in:
Glenn Randers-Pehrson 2015-02-07 09:03:30 -06:00
parent 8f0e2729dd
commit 8cd78da8b3
7 changed files with 49 additions and 27 deletions
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6
ANNOUNCE
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@ -1,4 +1,4 @@
Libpng 1.6.17beta02 - January 29, 2015
Libpng 1.6.17beta02 - February 7, 2015
This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.
@ -40,7 +40,9 @@ Version 1.6.17beta01 [January 29, 2015]
Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
pngset.c to avoid warnings about dead code.
Version 1.6.17beta02 [January 29, 2015]
Version 1.6.17beta02 [February 7, 2015]
Work around one more Coverity-scan dead-code warning.
Do not build png_product2() when it is unused.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

4
CHANGES
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@ -5141,7 +5141,9 @@ Version 1.6.17beta01 [January 29, 2015]
Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
pngset.c to avoid warnings about dead code.
Version 1.6.17beta02 [January 29, 2015]
Version 1.6.17beta02 [February 7, 2015]
Work around one more Coverity-scan dead-code warning.
Do not build png_product2() when it is unused.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

21
png.c
View File

@ -772,13 +772,13 @@ png_get_copyright(png_const_structrp png_ptr)
#else
# ifdef __STDC__
return PNG_STRING_NEWLINE \
"libpng version 1.6.17beta02 - February 4, 2015" PNG_STRING_NEWLINE \
"libpng version 1.6.17beta02 - February 7, 2015" PNG_STRING_NEWLINE \
"Copyright (c) 1998-2015 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
"Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
"Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
PNG_STRING_NEWLINE;
# else
return "libpng version 1.6.17beta02 - February 4, 2015\
return "libpng version 1.6.17beta02 - February 7, 2015\
Copyright (c) 1998-2015 Glenn Randers-Pehrson\
Copyright (c) 1996-1997 Andreas Dilger\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@ -3404,7 +3404,7 @@ png_gamma_significant(png_fixed_point gamma_val)
#endif
#ifdef PNG_READ_GAMMA_SUPPORTED
#if defined(PNG_16BIT_SUPPORTED) || !defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
#ifdef PNG_16BIT_SUPPORTED
/* A local convenience routine. */
static png_fixed_point
png_product2(png_fixed_point a, png_fixed_point b)
@ -3426,7 +3426,7 @@ png_product2(png_fixed_point a, png_fixed_point b)
return 0; /* overflow */
}
#endif /* 16BIT || !FLOATING_ARITHMETIC */
#endif /* 16BIT */
/* The inverse of the above. */
png_fixed_point
@ -3434,12 +3434,15 @@ png_reciprocal2(png_fixed_point a, png_fixed_point b)
{
/* The required result is 1/a * 1/b; the following preserves accuracy. */
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
double r = 1E15/a;
r /= b;
r = floor(r+.5);
if (a != 0 && b != 0)
{
double r = 1E15/a;
r /= b;
r = floor(r+.5);
if (r <= 2147483647. && r >= -2147483648.)
return (png_fixed_point)r;
if (r <= 2147483647. && r >= -2147483648.)
return (png_fixed_point)r;
}
#else
/* This may overflow because the range of png_fixed_point isn't symmetric,
* but this API is only used for the product of file and screen gamma so it

17
pngread.c
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@ -2285,8 +2285,14 @@ png_image_read_colormap(png_voidp argument)
output_processing = PNG_CMAP_NONE;
break;
}
#ifdef __COVERITY__
/* Coverity claims that output_encoding cannot be 2 (P_LINEAR)
* here.
*/
back_alpha = 255;
#else
back_alpha = output_encoding == P_LINEAR ? 65535 : 255;
#endif
}
/* output_processing means that the libpng-processed row will be
@ -2411,7 +2417,14 @@ png_image_read_colormap(png_voidp argument)
*/
background_index = i;
png_create_colormap_entry(display, i++, back_r, back_g, back_b,
output_encoding == P_LINEAR ? 65535U : 255U, output_encoding);
#ifdef __COVERITY__
/* Coverity claims that output_encoding cannot be 2 (P_LINEAR)
* here.
*/ 255U,
#else
output_encoding == P_LINEAR ? 65535U : 255U,
#endif
output_encoding);
/* For non-opaque input composite on the sRGB background - this
* requires inverting the encoding for each component. The input

4
pngrio.c
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@ -1,8 +1,8 @@
/* pngrio.c - functions for data input
*
* Last changed in libpng 1.6.15 [November 20, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* Last changed in libpng 1.6.17 [(PENDING RELEASE)]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*

14
pngrtran.c
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@ -3087,10 +3087,11 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, w;
png_byte hi,lo;
red = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
green = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
blue = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
hi=*(sp)++; lo=*(sp)++; red = (png_uint_16)((hi << 8) | (lo));
hi=*(sp)++; lo=*(sp)++; green = (png_uint_16)((hi << 8) | (lo));
hi=*(sp)++; lo=*(sp)++; blue = (png_uint_16)((hi << 8) | (lo));
if (red == green && red == blue)
{
@ -3138,10 +3139,11 @@ png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row)
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, gray16;
png_byte hi,lo;
red = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
green = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
blue = (png_uint_16)(((*(sp)) << 8) | *(sp + 1)); sp += 2;
hi=*(sp)++; lo=*(sp)++; red = (png_uint_16)((hi << 8) | (lo));
hi=*(sp)++; lo=*(sp)++; green = (png_uint_16)((hi << 8) | (lo));
hi=*(sp)++; lo=*(sp)++; blue = (png_uint_16)((hi << 8) | (lo));
if (red != green || red != blue)
rgb_error |= 1;

10
pngtest.c
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@ -1,8 +1,8 @@
/* pngtest.c - a simple test program to test libpng
*
* Last changed in libpng 1.6.15 [November 20, 2014]
* Copyright (c) 1998-2014 Glenn Randers-Pehrson
* Last changed in libpng 1.6.17 [(PENDING RELEASE)]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
@ -377,7 +377,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
io_ptr = png_get_io_ptr(png_ptr);
if (io_ptr != NULL)
{
check = fread(data, 1, length, (png_FILE_p)io_ptr);
check = fread(data, (sizeof (png_byte)), length, (png_FILE_p)io_ptr);
}
if (check != length)
@ -1610,8 +1610,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
png_size_t num_in, num_out;
char inbuf[256], outbuf[256];
num_in = fread(inbuf, 1, sizeof inbuf, fpin);
num_out = fread(outbuf, 1, sizeof outbuf, fpout);
num_in = fread(inbuf, 1, (sizeof inbuf), fpin);
num_out = fread(outbuf, 1, (sizeof outbuf), fpout);
if (num_in != num_out)
{