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// Copyright 2015 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.
#include <iosfwd>
#include <memory>
#include <string>
#include <vector>
#include "core/fxcrt/fx_memory_wrappers.h"
#include "third_party/base/numerics/safe_conversions.h"
#include "third_party/base/numerics/safe_math.h"
namespace fxcrt {
// Means of generating a key for searching STL collections of std::unique_ptr
// that avoids the side effect of deleting the pointer.
template <class T>
class FakeUniquePtr : public std::unique_ptr<T> {
using std::unique_ptr<T>::unique_ptr;
~FakeUniquePtr() { std::unique_ptr<T>::release(); }
// Convenience routine for "int-fected" code, so that the stl collection
// size_t size() method return values will be checked.
template <typename ResultType, typename Collection>
ResultType CollectionSize(const Collection& collection) {
return pdfium::base::checked_cast<ResultType>(collection.size());
// Convenience routine for "int-fected" code, to handle signed indicies. The
// compiler can deduce the type, making this more convenient than the above.
template <typename IndexType, typename Collection>
bool IndexInBounds(const Collection& collection, IndexType index) {
return index >= 0 && index < CollectionSize<IndexType>(collection);
// Safely allocate a 1-dim vector big enough for |w| by |h| or die.
template <typename T, typename A = std::allocator<T>>
std::vector<T, A> Vector2D(size_t w, size_t h) {
pdfium::base::CheckedNumeric<size_t> safe_size = w;
safe_size *= h;
return std::vector<T, A>(safe_size.ValueOrDie());
// String stream that uses PartitionAlloc for backing store.
using ostringstream = std::
basic_ostringstream<char, std::char_traits<char>, FxStringAllocator<char>>;
} // namespace fxcrt