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// Copyright 2012 The Chromium Authors
// 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<std::u16string, std::u16string> and swap the deserialized values.
#include "ui/base/clipboard/custom_data_helper.h"
#include <tuple>
#include <utility>
#include "base/containers/span.h"
#include "base/pickle.h"
namespace ui {
namespace {
bool SkipString16(base::PickleIterator* iter) {
DCHECK(iter);
size_t len;
if (!iter->ReadLength(&len))
return false;
return iter->SkipBytes(len * sizeof(char16_t));
}
} // namespace
void ReadCustomDataTypes(base::span<const uint8_t> data,
std::vector<std::u16string>* types) {
base::Pickle pickle = base::Pickle::WithData(data);
base::PickleIterator iter(pickle);
uint32_t size = 0;
if (!iter.ReadUInt32(&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.
size_t original_size = types->size();
for (uint32_t i = 0; i < size; ++i) {
types->push_back(std::u16string());
if (!iter.ReadString16(&types->back()) || !SkipString16(&iter)) {
types->resize(original_size);
return;
}
}
}
std::optional<std::u16string> ReadCustomDataForType(
base::span<const uint8_t> data,
std::u16string_view type) {
base::Pickle pickle = base::Pickle::WithData(data);
base::PickleIterator iter(pickle);
uint32_t size = 0;
if (!iter.ReadUInt32(&size))
return std::nullopt;
for (uint32_t i = 0; i < size; ++i) {
std::u16string deserialized_type;
if (!iter.ReadString16(&deserialized_type)) {
return std::nullopt;
}
if (deserialized_type == type) {
std::u16string result;
if (iter.ReadString16(&result)) {
return std::move(result);
}
return std::nullopt;
}
if (!SkipString16(&iter)) {
return std::nullopt;
}
}
return std::nullopt;
}
std::optional<std::unordered_map<std::u16string, std::u16string>>
ReadCustomDataIntoMap(base::span<const uint8_t> data) {
base::Pickle pickle = base::Pickle::WithData(data);
base::PickleIterator iter(pickle);
uint32_t size = 0;
if (!iter.ReadUInt32(&size)) {
return std::nullopt;
}
std::unordered_map<std::u16string, std::u16string> result;
for (uint32_t i = 0; i < size; ++i) {
std::u16string custom_type;
if (!iter.ReadString16(&custom_type)) {
return std::nullopt;
}
std::u16string custom_data;
if (!iter.ReadString16(&custom_data)) {
return std::nullopt;
}
result.insert({std::move(custom_type), std::move(custom_data)});
}
return std::move(result);
}
void WriteCustomDataToPickle(
const std::unordered_map<std::u16string, std::u16string>& data,
base::Pickle* pickle) {
pickle->WriteUInt32(data.size());
for (const auto& it : data) {
pickle->WriteString16(it.first);
pickle->WriteString16(it.second);
}
}
void WriteCustomDataToPickle(
const base::flat_map<std::u16string, std::u16string>& data,
base::Pickle* pickle) {
pickle->WriteUInt32(data.size());
for (const auto& it : data) {
pickle->WriteString16(it.first);
pickle->WriteString16(it.second);
}
}
} // namespace ui
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