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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This header file is used to hijack the include of "zlib.h" from libpng on
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* Macos. We do that to be able to build on macos 10.13 or later, but still
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* keep binary compatibility with older versions (as specified to configure).
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*
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* The problem is that in 10.13, Macos shipped with a newer version of zlib,
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* which exports the function inflateValidate. There is a call to this
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* function in pngrutil.c, guarded by a preprocessor check of ZLIB_VERNUM being
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* high enough. If we compile this call in and link to the newer version of
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* zlib, we will get link errors if the code is executed on an older Mac with
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* an older version of zlib.
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*
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* The zlib.h header in Macos has been annotated with Macos specific macros that
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* guard these kinds of version specific APIs, but libpng is not using those
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* checks in its conditionals, just ZLIB_VERNUM. To fix this, we check for the
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* MAC_OS_X_VERSION_MIN_REQUIRED macro here and adjust the ZLIB_VERNUM to the
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# known version bundled with that release. This solution is certainly a hack,
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* but it seems the affected versions of zlib.h are compatible enough for this
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* to work.
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*/
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#include <zlib.h>
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#include <AvailabilityMacros.h>
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#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
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# undef ZLIB_VERNUM
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# define ZLIB_VERNUM 0x1250
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#elif MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_13
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# undef ZLIB_VERNUM
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# define ZLIB_VERNUM 0x1280
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#endif
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