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Refactor check for zlib's inflateValidate presence

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No compile-time changes. Refactor a single and expanding statement
checking for availability of inflateValidate into an option.
This commit is contained in:
Dimitri Schoolwerth 2020-12-16 17:09:22 +01:00
parent 3ffeff7877
commit dfc331f0bd
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GPG Key ID: 9DC3A9240BDC6737
1 changed files with 22 additions and 3 deletions
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25
pngrutil.c
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@ -18,6 +18,27 @@
#ifdef PNG_READ_SUPPORTED
#ifndef PNG_USE_ZLIB_INFLATE_VALIDATE
/* Check if zlib's inflateValidate can be used. */
# if ZLIB_VERNUM >= 0x1290 && \
defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32)
/* Determine at compile-time whether inflateValidate is available by
* minimal supported OS version.
*/
# if defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
MAC_OS_X_VERSION_MIN_REQUIRED < 101300
/* Don't use if targeting pre-macOS 10.13. */
# define PNG_USE_ZLIB_INFLATE_VALIDATE 0
# endif
# else
# define PNG_USE_ZLIB_INFLATE_VALIDATE 0
# endif /* ZLIB_VERNUM && PNG_SET_OPTION_SUPPORTED && PNG_IGNORE_ADLER32 */
# ifndef PNG_USE_ZLIB_INFLATE_VALIDATE
# define PNG_USE_ZLIB_INFLATE_VALIDATE 1
# endif
#endif /* PNG_USE_ZLIB_INFLATE_VALIDATE */
png_uint_32 PNGAPI
png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
{
@ -422,9 +443,7 @@ png_inflate_claim(png_structrp png_ptr, png_uint_32 owner)
png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED;
}
#if ZLIB_VERNUM >= 0x1290 && \
defined(PNG_SET_OPTION_SUPPORTED) && defined(PNG_IGNORE_ADLER32) && \
!(defined(MAC_OS_X_VERSION_MIN_REQUIRED) && MAC_OS_X_VERSION_MIN_REQUIRED < 101300)
#if PNG_USE_ZLIB_INFLATE_VALIDATE
if (((png_ptr->options >> PNG_IGNORE_ADLER32) & 3) == PNG_OPTION_ON)
/* Turn off validation of the ADLER32 checksum in IDAT chunks */
ret = inflateValidate(&png_ptr->zstream, 0);