增加换肤功能

Pods/Protobuf/objectivec/GPBExtensionRegistry.m

@@ -0,0 +1,106 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#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