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+/*
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+ * Copyright (c) 2014 Petroules Corporation. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are met:
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+ *
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+ * 1. Redistributions of source code must retain the above copyright notice, this
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+ * list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright notice,
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+ * this list of conditions and the following disclaimer in the documentation
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+ * and/or other materials provided with the distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#import "NSProcessInfo+PECocoaBackports.h"
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+
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+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
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+#import <UIKit/UIKit.h>
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+#elif defined(TARGET_OS_MAC) && TARGET_OS_MAC
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+#import <CoreServices/CoreServices.h>
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+#endif
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+
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+@interface NSProcessInfo (PECocoaBackportsPrivate)
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+
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+#if LOAD_OPERATING_SYSTEM_VERSION
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+- (NSOperatingSystemVersion)PECocoaBackports_operatingSystemVersion;
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+- (BOOL)PECocoaBackports_isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion)version;
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+#endif
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+
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+@end
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+
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+@implementation NSProcessInfo (PECocoaBackportsPrivate)
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+
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++ (void)load
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+{
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+#if LOAD_OPERATING_SYSTEM_VERSION
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+ // Public API since OS X 10.10 (present since 10.9) and iOS 8.0
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+ class_addInstanceMethodIfNecessary([self class],
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+ NSSelectorFromString(@"operatingSystemVersion"),
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+ @selector(PECocoaBackports_operatingSystemVersion));
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+
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+ // Public API since OS X 10.10 (present since 10.9) and iOS 8.0
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+ class_addInstanceMethodIfNecessary([self class],
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+ NSSelectorFromString(@"isOperatingSystemAtLeastVersion:"),
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+ @selector(PECocoaBackports_isOperatingSystemAtLeastVersion:));
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+#endif
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+}
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+
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+#if LOAD_OPERATING_SYSTEM_VERSION
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+- (NSOperatingSystemVersion)PECocoaBackports_operatingSystemVersion
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+{
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+ NSOperatingSystemVersion v = {0, 0, 0};
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+ SInt32 major = 0, minor = 0, patch = 0;
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+#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
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+#if !defined(__has_feature) || !__has_feature(objc_arc)
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+ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
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+#endif
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+ NSArray *parts = [[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."];
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+ major = parts.count > 0 ? [[parts objectAtIndex:0] intValue] : 0;
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+ minor = parts.count > 1 ? [[parts objectAtIndex:1] intValue] : 0;
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+ patch = parts.count > 2 ? [[parts objectAtIndex:2] intValue] : 0;
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+#if !defined(__has_feature) || !__has_feature(objc_arc)
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+ [pool release];
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+#endif
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+#elif defined(TARGET_OS_MAC) && TARGET_OS_MAC
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+#pragma clang diagnostic push
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+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
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+ if (Gestalt(gestaltSystemVersionMajor, &major) != noErr) return v;
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+ if (Gestalt(gestaltSystemVersionMinor, &minor) != noErr) return v;
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+ if (Gestalt(gestaltSystemVersionBugFix, &patch) != noErr) return v;
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+#pragma clang diagnostic pop
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+#endif
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+ v.majorVersion = major;
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+ v.minorVersion = minor;
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+ v.patchVersion = patch;
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+ return v;
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+}
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+
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+- (BOOL)PECocoaBackports_isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion)version
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+{
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+ const NSOperatingSystemVersion systemVersion = [self operatingSystemVersion];
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+ if (systemVersion.majorVersion == version.majorVersion) {
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+ if (systemVersion.minorVersion == version.minorVersion) {
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+ return systemVersion.patchVersion >= version.patchVersion;
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+ }
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+ return systemVersion.minorVersion >= version.minorVersion;
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+ }
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+ return systemVersion.majorVersion >= version.majorVersion;
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+}
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+#endif
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+
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+@end
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