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1// Protocol Buffers - Google's data interchange format
2// Copyright 2008 Google Inc.  All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are
7// met:
8//
9//     * Redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer.
11//     * Redistributions in binary form must reproduce the above
12// copyright notice, this list of conditions and the following disclaimer
13// in the documentation and/or other materials provided with the
14// distribution.
15//     * Neither the name of Google Inc. nor the names of its
16// contributors may be used to endorse or promote products derived from
17// this software without specific prior written permission.
18//
19// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31#import "GPBExtensionRegistry.h"
32
33#import "GPBBootstrap.h"
34#import "GPBDescriptor.h"
35
36@implementation GPBExtensionRegistry {
37  NSMutableDictionary *mutableClassMap_;
38}
39
40- (instancetype)init {
41  if ((self = [super init])) {
42    mutableClassMap_ = [[NSMutableDictionary alloc] init];
43  }
44  return self;
45}
46
47- (void)dealloc {
48  [mutableClassMap_ release];
49  [super dealloc];
50}
51
52// Direct access is use for speed, to avoid even internally declaring things
53// read/write, etc. The warning is enabled in the project to ensure code calling
54// protos can turn on -Wdirect-ivar-access without issues.
55#pragma clang diagnostic push
56#pragma clang diagnostic ignored "-Wdirect-ivar-access"
57
58- (instancetype)copyWithZone:(NSZone *)zone {
59  GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
60  [result addExtensions:self];
61  return result;
62}
63
64- (void)addExtension:(GPBExtensionDescriptor *)extension {
65  if (extension == nil) {
66    return;
67  }
68
69  Class containingMessageClass = extension.containingMessageClass;
70  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
71      [mutableClassMap_ objectForKey:containingMessageClass];
72  if (extensionMap == nil) {
73    // Use a custom dictionary here because the keys are numbers and conversion
74    // back and forth from NSNumber isn't worth the cost.
75    extensionMap = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL,
76                                             &kCFTypeDictionaryValueCallBacks);
77    [mutableClassMap_ setObject:(id)extensionMap
78                         forKey:(id<NSCopying>)containingMessageClass];
79    CFRelease(extensionMap);
80  }
81
82  ssize_t key = extension.fieldNumber;
83  CFDictionarySetValue(extensionMap, (const void *)key, extension);
84}
85
86- (GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
87                                       fieldNumber:(NSInteger)fieldNumber {
88  Class messageClass = descriptor.messageClass;
89  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
90      [mutableClassMap_ objectForKey:messageClass];
91  ssize_t key = fieldNumber;
92  GPBExtensionDescriptor *result =
93      (extensionMap
94       ? CFDictionaryGetValue(extensionMap, (const void *)key)
95       : nil);
96  return result;
97}
98
99static void CopyKeyValue(const void *key, const void *value, void *context) {
100  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)context;
101  CFDictionarySetValue(extensionMap, key, value);
102}
103
104- (void)addExtensions:(GPBExtensionRegistry *)registry {
105  if (registry == nil) {
106    // In the case where there are no extensions just ignore.
107    return;
108  }
109  NSMutableDictionary *otherClassMap = registry->mutableClassMap_;
110  [otherClassMap enumerateKeysAndObjectsUsingBlock:^(id key, id value, BOOL * stop) {
111#pragma unused(stop)
112    Class containingMessageClass = key;
113    CFMutableDictionaryRef otherExtensionMap = (CFMutableDictionaryRef)value;
114
115    CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
116        [mutableClassMap_ objectForKey:containingMessageClass];
117    if (extensionMap == nil) {
118      extensionMap = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, otherExtensionMap);
119      [mutableClassMap_ setObject:(id)extensionMap
120                           forKey:(id<NSCopying>)containingMessageClass];
121      CFRelease(extensionMap);
122    } else {
123      CFDictionaryApplyFunction(otherExtensionMap, CopyKeyValue, extensionMap);
124    }
125  }];
126}
127
128#pragma clang diagnostic pop
129
130@end
131