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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/mojo/string16_mojom_traits.h"
#include <cstring>
#include "base/containers/span.h"
#include "base/strings/latin1_string_conversions.h"
#include "mojo/public/cpp/base/big_buffer.h"
#include "mojo/public/cpp/base/big_buffer_mojom_traits.h"
namespace mojo {
MaybeOwnedString16::MaybeOwnedString16(std::u16string owned_storage)
: owned_storage_(owned_storage),
unowned_(reinterpret_cast<const uint16_t*>(owned_storage_.data()),
owned_storage_.size()) {}
MaybeOwnedString16::MaybeOwnedString16(base::span<const uint16_t> unowned)
: unowned_(unowned) {}
MaybeOwnedString16::~MaybeOwnedString16() = default;
// static
MaybeOwnedString16 StructTraits<mojo_base::mojom::String16DataView,
WTF::String>::data(const WTF::String& input) {
if (input.Is8Bit()) {
return MaybeOwnedString16(base::Latin1OrUTF16ToUTF16(
input.length(), input.Characters8(), nullptr));
}
return MaybeOwnedString16(base::span(
reinterpret_cast<const uint16_t*>(input.Characters16()), input.length()));
}
// static
bool StructTraits<mojo_base::mojom::String16DataView, WTF::String>::Read(
mojo_base::mojom::String16DataView data,
WTF::String* out) {
ArrayDataView<uint16_t> view;
data.GetDataDataView(&view);
if (view.size() > std::numeric_limits<uint32_t>::max())
return false;
*out = WTF::String(
base::span(reinterpret_cast<const UChar*>(view.data()), view.size()));
return true;
}
// static
mojo_base::BigBuffer StructTraits<mojo_base::mojom::BigString16DataView,
WTF::String>::data(const WTF::String& input) {
if (input.Is8Bit()) {
std::u16string input16(input.Characters8(),
input.Characters8() + input.length());
return mojo_base::BigBuffer(base::as_byte_span(input16));
}
return mojo_base::BigBuffer(base::as_bytes(input.Span16()));
}
// static
bool StructTraits<mojo_base::mojom::BigString16DataView, WTF::String>::Read(
mojo_base::mojom::BigString16DataView data,
WTF::String* out) {
mojo_base::BigBuffer buffer;
if (!data.ReadData(&buffer))
return false;
size_t size = buffer.size();
if (size % sizeof(UChar))
return false;
size /= sizeof(UChar);
if (size > std::numeric_limits<uint32_t>::max())
return false;
// An empty |mojo_base::BigBuffer| may have a null |data()| if empty.
if (!size) {
*out = g_empty_string;
} else {
*out = WTF::String(
base::span(reinterpret_cast<const UChar*>(buffer.data()), size));
}
return true;
}
} // namespace mojo
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