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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// TODO(dcheng): For efficiency reasons, consider passing custom data around
// as a vector instead. It allows us to append a
// std::pair<string16, string16> and swap the deserialized values in.
#include "ui/base/clipboard/custom_data_helper.h"
#include <utility>
#include "base/pickle.h"
namespace ui {
namespace {
class SkippablePickle : public Pickle {
public:
SkippablePickle(const void* data, size_t data_len);
bool SkipString16(PickleIterator* iter);
};
SkippablePickle::SkippablePickle(const void* data, size_t data_len)
: Pickle(reinterpret_cast<const char*>(data), data_len) {
}
bool SkippablePickle::SkipString16(PickleIterator* iter) {
DCHECK(iter);
int len;
if (!ReadLength(iter, &len))
return false;
return iter->SkipBytes(len * sizeof(char16));
}
} // namespace
void ReadCustomDataTypes(const void* data,
size_t data_length,
std::vector<string16>* types) {
SkippablePickle pickle(data, data_length);
PickleIterator iter(pickle);
uint64 size = 0;
if (!pickle.ReadUInt64(&iter, &size))
return;
// Keep track of the original elements in the types vector. On failure, we
// truncate the vector to the original size since we want to ignore corrupt
// custom data pickles.
uint64 original_size = types->size();
for (uint64 i = 0; i < size; ++i) {
types->push_back(string16());
if (!pickle.ReadString16(&iter, &types->back()) ||
!pickle.SkipString16(&iter)) {
types->resize(original_size);
return;
}
}
}
void ReadCustomDataForType(const void* data,
size_t data_length,
const string16& type,
string16* result) {
SkippablePickle pickle(data, data_length);
PickleIterator iter(pickle);
uint64 size = 0;
if (!pickle.ReadUInt64(&iter, &size))
return;
for (uint64 i = 0; i < size; ++i) {
string16 deserialized_type;
if (!pickle.ReadString16(&iter, &deserialized_type))
return;
if (deserialized_type == type) {
pickle.ReadString16(&iter, result);
return;
}
if (!pickle.SkipString16(&iter))
return;
}
}
void ReadCustomDataIntoMap(const void* data,
size_t data_length,
std::map<string16, string16>* result) {
Pickle pickle(reinterpret_cast<const char*>(data), data_length);
PickleIterator iter(pickle);
uint64 size = 0;
if (!pickle.ReadUInt64(&iter, &size))
return;
for (uint64 i = 0; i < size; ++i) {
string16 type;
if (!pickle.ReadString16(&iter, &type)) {
// Data is corrupt, return an empty map.
result->clear();
return;
}
std::pair<std::map<string16, string16>::iterator, bool> insert_result =
result->insert(std::make_pair(type, string16()));
if (!pickle.ReadString16(&iter, &insert_result.first->second)) {
// Data is corrupt, return an empty map.
result->clear();
return;
}
}
}
void WriteCustomDataToPickle(const std::map<string16, string16>& data,
Pickle* pickle) {
pickle->WriteUInt64(data.size());
for (std::map<string16, string16>::const_iterator it = data.begin();
it != data.end();
++it) {
pickle->WriteString16(it->first);
pickle->WriteString16(it->second);
}
}
} // namespace ui
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