1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * This header file is used to hijack the include of "zlib.h" from libpng on 28 * Macos. We do that to be able to build on macos 10.13 or later, but still 29 * keep binary compatibility with older versions (as specified to configure). 30 * 31 * The problem is that in 10.13, Macos shipped with a newer version of zlib, 32 * which exports the function inflateValidate. There is a call to this 33 * function in pngrutil.c, guarded by a preprocessor check of ZLIB_VERNUM being 34 * high enough. If we compile this call in and link to the newer version of 35 * zlib, we will get link errors if the code is executed on an older Mac with 36 * an older version of zlib. 37 * 38 * The zlib.h header in Macos has been annotated with Macos specific macros that 39 * guard these kinds of version specific APIs, but libpng is not using those 40 * checks in its conditionals, just ZLIB_VERNUM. To fix this, we check for the 41 * MAC_OS_X_VERSION_MIN_REQUIRED macro here and adjust the ZLIB_VERNUM to the 42 # known version bundled with that release. This solution is certainly a hack, 43 * but it seems the affected versions of zlib.h are compatible enough for this 44 * to work. 45 */ 46 47 #include <zlib.h> 48 #include <AvailabilityMacros.h> 49 50 #if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12 51 # undef ZLIB_VERNUM 52 # define ZLIB_VERNUM 0x1250 53 #elif MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_13 54 # undef ZLIB_VERNUM 55 # define ZLIB_VERNUM 0x1280 56 #endif