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 //
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10 // notice, this list of conditions and the following disclaimer.
11 // * Redistributions in binary form must reproduce the above
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13 // in the documentation and/or other materials provided with the
14 // distribution.
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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
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29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 #include <google/protobuf/generated_enum_util.h>
32
33 #include <algorithm>
34
35 #include <google/protobuf/generated_message_util.h>
36
37 namespace google {
38 namespace protobuf {
39 namespace internal {
40 namespace {
41
EnumCompareByName(const EnumEntry & a,const EnumEntry & b)42 bool EnumCompareByName(const EnumEntry& a, const EnumEntry& b) {
43 return StringPiece(a.name) < StringPiece(b.name);
44 }
45
46 // Gets the numeric value of the EnumEntry at the given index, but returns a
47 // special value for the index -1. This gives a way to use std::lower_bound on a
48 // sorted array of indices while searching for value that we associate with -1.
GetValue(const EnumEntry * enums,int i,int target)49 int GetValue(const EnumEntry* enums, int i, int target) {
50 if (i == -1) {
51 return target;
52 } else {
53 return enums[i].value;
54 }
55 }
56
57 } // namespace
58
LookUpEnumValue(const EnumEntry * enums,size_t size,StringPiece name,int * value)59 bool LookUpEnumValue(const EnumEntry* enums, size_t size,
60 StringPiece name, int* value) {
61 EnumEntry target{name, 0};
62 auto it = std::lower_bound(enums, enums + size, target, EnumCompareByName);
63 if (it != enums + size && it->name == name) {
64 *value = it->value;
65 return true;
66 }
67 return false;
68 }
69
LookUpEnumName(const EnumEntry * enums,const int * sorted_indices,size_t size,int value)70 int LookUpEnumName(const EnumEntry* enums, const int* sorted_indices,
71 size_t size, int value) {
72 auto comparator = [enums, value](int a, int b) {
73 return GetValue(enums, a, value) < GetValue(enums, b, value);
74 };
75 auto it =
76 std::lower_bound(sorted_indices, sorted_indices + size, -1, comparator);
77 if (it != sorted_indices + size && enums[*it].value == value) {
78 return it - sorted_indices;
79 }
80 return -1;
81 }
82
InitializeEnumStrings(const EnumEntry * enums,const int * sorted_indices,size_t size,internal::ExplicitlyConstructed<std::string> * enum_strings)83 bool InitializeEnumStrings(
84 const EnumEntry* enums, const int* sorted_indices, size_t size,
85 internal::ExplicitlyConstructed<std::string>* enum_strings) {
86 for (size_t i = 0; i < size; ++i) {
87 enum_strings[i].Construct(enums[sorted_indices[i]].name);
88 internal::OnShutdownDestroyString(enum_strings[i].get_mutable());
89 }
90 return true;
91 }
92
93 } // namespace internal
94 } // namespace protobuf
95 } // namespace google
96