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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 // | |
| 5 // TODO(dcheng): For efficiency reasons, consider passing custom data around | |
| 6 // as a vector instead. It allows us to append a | |
| 7 // std::pair<base::string16, base::string16> and swap the deserialized values. | |
| 8 | |
| 9 #include "ui/base/clipboard/custom_data_helper.h" | |
| 10 | |
| 11 #include <utility> | |
| 12 | |
| 13 #include "base/pickle.h" | |
| 14 | |
| 15 namespace ui { | |
| 16 | |
| 17 namespace { | |
| 18 | |
| 19 class SkippablePickle : public Pickle { | |
| 20 public: | |
| 21 SkippablePickle(const void* data, size_t data_len); | |
| 22 bool SkipString16(PickleIterator* iter); | |
| 23 }; | |
| 24 | |
| 25 SkippablePickle::SkippablePickle(const void* data, size_t data_len) | |
| 26 : Pickle(reinterpret_cast<const char*>(data), data_len) { | |
| 27 } | |
| 28 | |
| 29 bool SkippablePickle::SkipString16(PickleIterator* iter) { | |
| 30 DCHECK(iter); | |
| 31 | |
| 32 int len; | |
| 33 if (!iter->ReadLength(&len)) | |
| 34 return false; | |
| 35 return iter->SkipBytes(len * sizeof(base::char16)); | |
| 36 } | |
| 37 | |
| 38 } // namespace | |
| 39 | |
| 40 void ReadCustomDataTypes(const void* data, | |
| 41 size_t data_length, | |
| 42 std::vector<base::string16>* types) { | |
| 43 SkippablePickle pickle(data, data_length); | |
| 44 PickleIterator iter(pickle); | |
| 45 | |
| 46 size_t size = 0; | |
| 47 if (!iter.ReadSizeT(&size)) | |
| 48 return; | |
| 49 | |
| 50 // Keep track of the original elements in the types vector. On failure, we | |
| 51 // truncate the vector to the original size since we want to ignore corrupt | |
| 52 // custom data pickles. | |
| 53 size_t original_size = types->size(); | |
| 54 | |
| 55 for (size_t i = 0; i < size; ++i) { | |
| 56 types->push_back(base::string16()); | |
| 57 if (!iter.ReadString16(&types->back()) || | |
| 58 !pickle.SkipString16(&iter)) { | |
| 59 types->resize(original_size); | |
| 60 return; | |
| 61 } | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 void ReadCustomDataForType(const void* data, | |
| 66 size_t data_length, | |
| 67 const base::string16& type, | |
| 68 base::string16* result) { | |
| 69 SkippablePickle pickle(data, data_length); | |
| 70 PickleIterator iter(pickle); | |
| 71 | |
| 72 size_t size = 0; | |
| 73 if (!iter.ReadSizeT(&size)) | |
| 74 return; | |
| 75 | |
| 76 for (size_t i = 0; i < size; ++i) { | |
| 77 base::string16 deserialized_type; | |
| 78 if (!iter.ReadString16(&deserialized_type)) | |
| 79 return; | |
| 80 if (deserialized_type == type) { | |
| 81 ignore_result(iter.ReadString16(result)); | |
| 82 return; | |
| 83 } | |
| 84 if (!pickle.SkipString16(&iter)) | |
| 85 return; | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 void ReadCustomDataIntoMap(const void* data, | |
| 90 size_t data_length, | |
| 91 std::map<base::string16, base::string16>* result) { | |
| 92 Pickle pickle(reinterpret_cast<const char*>(data), data_length); | |
| 93 PickleIterator iter(pickle); | |
| 94 | |
| 95 size_t size = 0; | |
| 96 if (!iter.ReadSizeT(&size)) | |
| 97 return; | |
| 98 | |
| 99 for (size_t i = 0; i < size; ++i) { | |
| 100 base::string16 type; | |
| 101 if (!iter.ReadString16(&type)) { | |
| 102 // Data is corrupt, return an empty map. | |
| 103 result->clear(); | |
| 104 return; | |
| 105 } | |
| 106 std::pair<std::map<base::string16, base::string16>::iterator, bool> | |
| 107 insert_result = result->insert(std::make_pair(type, base::string16())); | |
| 108 if (!iter.ReadString16(&insert_result.first->second)) { | |
| 109 // Data is corrupt, return an empty map. | |
| 110 result->clear(); | |
| 111 return; | |
| 112 } | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 void WriteCustomDataToPickle( | |
| 117 const std::map<base::string16, base::string16>& data, | |
| 118 Pickle* pickle) { | |
| 119 pickle->WriteSizeT(data.size()); | |
| 120 for (std::map<base::string16, base::string16>::const_iterator it = | |
| 121 data.begin(); | |
| 122 it != data.end(); | |
| 123 ++it) { | |
| 124 pickle->WriteString16(it->first); | |
| 125 pickle->WriteString16(it->second); | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 } // namespace ui | |
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