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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  CFMutableDictionaryRef mutableClassMap_;
38}
39
40- (instancetype)init {
41  if ((self = [super init])) {
42    // The keys are ObjC classes, so straight up ptr comparisons are fine.
43    mutableClassMap_ = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL,
44                                             &kCFTypeDictionaryValueCallBacks);
45  }
46  return self;
47}
48
49- (void)dealloc {
50  CFRelease(mutableClassMap_);
51  [super dealloc];
52}
53
54// Direct access is use for speed, to avoid even internally declaring things
55// read/write, etc. The warning is enabled in the project to ensure code calling
56// protos can turn on -Wdirect-ivar-access without issues.
57#pragma clang diagnostic push
58#pragma clang diagnostic ignored "-Wdirect-ivar-access"
59
60- (instancetype)copyWithZone:(NSZone *)zone {
61  GPBExtensionRegistry *result = [[[self class] allocWithZone:zone] init];
62  [result addExtensions:self];
63  return result;
64}
65
66- (void)addExtension:(GPBExtensionDescriptor *)extension {
67  if (extension == nil) {
68    return;
69  }
70
71  Class containingMessageClass = extension.containingMessageClass;
72  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
73      CFDictionaryGetValue(mutableClassMap_, containingMessageClass);
74  if (extensionMap == nil) {
75    // Use a custom dictionary here because the keys are numbers and conversion
76    // back and forth from NSNumber isn't worth the cost.
77    extensionMap = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, NULL,
78                                             &kCFTypeDictionaryValueCallBacks);
79    CFDictionarySetValue(mutableClassMap_, containingMessageClass, extensionMap);
80    CFRelease(extensionMap);
81  }
82
83  ssize_t key = extension.fieldNumber;
84  CFDictionarySetValue(extensionMap, (const void *)key, extension);
85}
86
87- (GPBExtensionDescriptor *)extensionForDescriptor:(GPBDescriptor *)descriptor
88                                       fieldNumber:(NSInteger)fieldNumber {
89  Class messageClass = descriptor.messageClass;
90  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
91      CFDictionaryGetValue(mutableClassMap_, messageClass);
92  ssize_t key = fieldNumber;
93  GPBExtensionDescriptor *result =
94      (extensionMap
95       ? CFDictionaryGetValue(extensionMap, (const void *)key)
96       : nil);
97  return result;
98}
99
100static void CopyKeyValue(const void *key, const void *value, void *context) {
101  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)context;
102  CFDictionarySetValue(extensionMap, key, value);
103}
104
105static void CopySubDictionary(const void *key, const void *value, void *context) {
106  CFMutableDictionaryRef mutableClassMap = (CFMutableDictionaryRef)context;
107  Class containingMessageClass = key;
108  CFMutableDictionaryRef otherExtensionMap = (CFMutableDictionaryRef)value;
109
110  CFMutableDictionaryRef extensionMap = (CFMutableDictionaryRef)
111      CFDictionaryGetValue(mutableClassMap, containingMessageClass);
112  if (extensionMap == nil) {
113    extensionMap = CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, otherExtensionMap);
114    CFDictionarySetValue(mutableClassMap, containingMessageClass, extensionMap);
115    CFRelease(extensionMap);
116  } else {
117    CFDictionaryApplyFunction(otherExtensionMap, CopyKeyValue, extensionMap);
118  }
119}
120
121- (void)addExtensions:(GPBExtensionRegistry *)registry {
122  if (registry == nil) {
123    // In the case where there are no extensions just ignore.
124    return;
125  }
126  CFDictionaryApplyFunction(registry->mutableClassMap_, CopySubDictionary, mutableClassMap_);
127}
128
129#pragma clang diagnostic pop
130
131@end
132