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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TransferString.h"
#include <wtf/text/ExternalStringImpl.h>
#if USE(CF)
#include <wtf/cf/VectorCF.h>
#endif
namespace IPC {
#if USE(CF)
std::optional<TransferString> TransferString::create(CFStringRef string)
{
if (!string)
return TransferString { String { } };
CFIndex size = CFStringGetLength(string);
if (!size)
return TransferString { ""_s };
// The transferAsMappingSize checks are inside the `if`s because we want to make sure
// that the getter will return the data. We need that during ::toIPCData.
if (auto span8 = CFStringGetLatin1CStringSpan(string); !span8.empty()) {
if (span8.size_bytes() < transferAsMappingSize)
return TransferString { string };
return createCopy(span8);
}
if (auto span16 = CFStringGetCharactersSpan(string); !span16.empty()) {
if (span16.size_bytes() < transferAsMappingSize)
return TransferString { string };
return createCopy(span16);
}
// Not native Latin1 or UTF-16 string, needs a copy from the CFString
// to get UTF-16. Copy small ones to be held and sent as String.
auto dataSize = static_cast<size_t>(size) * sizeof(char16_t);
if (dataSize < transferAsMappingSize)
return TransferString { String { string } };
RefPtr buffer = WebCore::SharedMemory::allocate(dataSize);
if (!buffer)
return std::nullopt;
auto bufferSpan = spanReinterpretCast<char16_t>(buffer->mutableSpan());
CFStringCopyCharactersSpan(string, bufferSpan);
auto handle = buffer->createHandle(WebCore::SharedMemoryProtection::ReadOnly);
if (!handle)
return std::nullopt;
return std::optional<TransferString> { std::in_place, SharedSpan16 { WTFMove(*handle) } };
}
TransferString::TransferString(CFStringRef string)
: m_storage(RetainPtr { string })
{
}
#endif
std::optional<TransferString> TransferString::createCopy(std::span<const Latin1Character> span8)
{
auto handle = WebCore::SharedMemoryHandle::createCopy(span8, WebCore::SharedMemoryProtection::ReadOnly);
if (!handle)
return std::nullopt;
return std::optional<TransferString> { std::in_place, SharedSpan8 { WTFMove(*handle) } };
}
std::optional<TransferString> TransferString::createCopy(std::span<const char16_t> span16)
{
auto handle = WebCore::SharedMemoryHandle::createCopy(asBytes(span16), WebCore::SharedMemoryProtection::ReadOnly);
if (!handle)
return std::nullopt;
return std::optional<TransferString> { std::in_place, SharedSpan16 { WTFMove(*handle) } };
}
std::optional<String> TransferString::release(size_t maxCopySizeInBytes) && // NOLINT
{ // NOLINT
return WTF::switchOn(WTFMove(m_storage),
[](String string) {
return std::optional<String> { std::in_place, WTFMove(string) };
},
#if USE(CF)
[](RetainPtr<CFStringRef> string) {
return std::optional<String> { std::in_place, string.get() };
},
#endif
[maxCopySizeInBytes](SharedSpan8 handle) -> std::optional<String> {
RefPtr<SharedMemory> memory = WebCore::SharedMemory::map(WTFMove(handle.dataHandle), WebCore::SharedMemoryProtection::ReadOnly);
if (!memory)
return std::nullopt;
if (memory->size() > maxCopySizeInBytes) {
Ref<StringImpl> impl = ExternalStringImpl::create(byteCast<Latin1Character>(memory->span()), [memory = memory.releaseNonNull()] (auto...) mutable { });
return std::optional<String> { std::in_place, String { WTFMove(impl) } };
}
return std::optional<String> { std::in_place, String { byteCast<Latin1Character>(memory->span()) } };
},
[maxCopySizeInBytes](SharedSpan16 handle) -> std::optional<String> {
RefPtr<SharedMemory> memory = WebCore::SharedMemory::map(WTFMove(handle.dataHandle), WebCore::SharedMemoryProtection::ReadOnly);
if (!memory || (memory->size() % sizeof(char16_t)))
return std::nullopt;
if (memory->size() > maxCopySizeInBytes) {
Ref<StringImpl> impl = ExternalStringImpl::create(spanReinterpretCast<const char16_t>(memory->span()), [memory = memory.releaseNonNull()] (auto...) mutable { });
return std::optional<String> { std::in_place, String { WTFMove(impl) } };
}
return std::optional<String> { std::in_place, String { spanReinterpretCast<const char16_t>(memory->span()) } };
}
);
}
TransferString::IPCData TransferString::toIPCData() const
{
return WTF::switchOn(m_storage,
[](const String& string) {
if (string.isNull())
return IPCData { std::monostate { } };
if (string.is8Bit())
return IPCData { string.span8() };
return IPCData { string.span16() };
},
#if USE(CF)
[](const RetainPtr<CFStringRef>& string) {
if (auto span8 = CFStringGetLatin1CStringSpan(string.get()); !span8.empty())
return IPCData { span8 };
return IPCData { CFStringGetCharactersSpan(string.get()) };
},
#endif
[](const SharedSpan8& handle) {
return IPCData { SharedSpan8 { WebCore::SharedMemoryHandle { handle.dataHandle } } };
},
[](const SharedSpan16& handle) -> IPCData {
return IPCData { SharedSpan16 { WebCore::SharedMemoryHandle { handle.dataHandle } } };
}
);
}
}
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