Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
git-subtree-split: fcd3b9a85ef36e46643dc30176cea1a7ad62e02b

objectivec/GPBExtensionRegistry.m

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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#import "GPBExtensionRegistry.h"
+
+#import "GPBBootstrap.h"
+#import "GPBDescriptor.h"
+
+@implementation GPBExtensionRegistry {
+  CFMutableDictionaryRef mutableClassMap_;
+}
+
+- (instancetype)init {
+  if ((self = [super init])) {
+    // The keys are ObjC classes, so straight up ptr comparisons are fine.
+    mutableClassMap_ =
+        CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL, &kCFTypeDictionaryValueCallBacks);
+  }
+  return self;
+}
+
+- (void)dealloc {
+  CFRelease(mutableClassMap_);
+  [super dealloc];
+}
+
+// Direct access is use for speed, to avoid even internally declaring things
+// read/write, etc. The warning is enabled in the project to ensure code calling
+// protos can turn on -Wdirect-ivar-access without issues.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdirect-ivar-access"
+
+- (instancetype)copyWithZone:(NSZone *)zone {
+  GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
+  [result addExtensions:self];
+  return result;
+}
+
+- (void)addExtension:(GPBExtensionDescriptor *)extension {
+  if (extension == nil) {
+    return;
+  }
+
+  Class containingMessageClass = extension.containingMessageClass;
+  CFMutableDictionaryRef extensionMap =
+      (CFMutableDictionaryRef)CFDictionaryGetValue(mutableClassMap_, containingMessageClass);
+  if (extensionMap == nil) {
+    // Use a custom dictionary here because the keys are numbers and conversion
+    // back and forth from NSNumber isn't worth the cost.
+    extensionMap =
+        CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL, &kCFTypeDictionaryValueCallBacks);
+    CFDictionarySetValue(mutableClassMap_, containingMessageClass, extensionMap);
+    CFRelease(extensionMap);
+  }
+
+  ssize_t key = extension.fieldNumber;
+  CFDictionarySetValue(extensionMap, (const void *)key, extension);
+}
+
+- (GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
+                                       fieldNumber:(NSInteger)fieldNumber {
+  Class messageClass = descriptor.messageClass;
+  CFMutableDictionaryRef extensionMap =
+      (CFMutableDictionaryRef)CFDictionaryGetValue(mutableClassMap_, messageClass);
+  ssize_t key = fieldNumber;
+  GPBExtensionDescriptor *result =
+      (extensionMap ? CFDictionaryGetValue(extensionMap, (const void *)key) : nil);
+  return result;
+}
+
+static void CopyKeyValue(const void *key, const void *value, void *context) {
+  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)context;
+  CFDictionarySetValue(extensionMap, key, value);
+}
+
+static void CopySubDictionary(const void *key, const void *value, void *context) {
+  CFMutableDictionaryRef mutableClassMap = (CFMutableDictionaryRef)context;
+  Class containingMessageClass = key;
+  CFMutableDictionaryRef otherExtensionMap = (CFMutableDictionaryRef)value;
+
+  CFMutableDictionaryRef extensionMap =
+      (CFMutableDictionaryRef)CFDictionaryGetValue(mutableClassMap, containingMessageClass);
+  if (extensionMap == nil) {
+    extensionMap = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, otherExtensionMap);
+    CFDictionarySetValue(mutableClassMap, containingMessageClass, extensionMap);
+    CFRelease(extensionMap);
+  } else {
+    CFDictionaryApplyFunction(otherExtensionMap, CopyKeyValue, extensionMap);
+  }
+}
+
+- (void)addExtensions:(GPBExtensionRegistry *)registry {
+  if (registry == nil) {
+    // In the case where there are no extensions just ignore.
+    return;
+  }
+  CFDictionaryApplyFunction(registry->mutableClassMap_, CopySubDictionary, mutableClassMap_);
+}
+
+#pragma clang diagnostic pop
+
+@end