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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/LSValue.h"
#include "mozIStorageStatement.h"
#include "mozilla/dom/SnappyUtils.h"
#include "mozilla/fallible.h"
#include "mozilla/TextUtils.h"
#include "nsDebug.h"
#include "nsError.h"
namespace mozilla::dom {
namespace {
bool PutStringBytesToCString(const nsAString& aSrc, nsCString& aDest) {
const char16_t* bufferData;
const size_t byteLength = sizeof(char16_t) * aSrc.GetData(&bufferData);
char* destDataPtr;
const auto newLength = aDest.GetMutableData(&destDataPtr, byteLength);
if (newLength != byteLength) {
return false;
}
std::memcpy(static_cast<void*>(destDataPtr),
static_cast<const void*>(bufferData), byteLength);
return true;
}
template <class T>
using TypeBufferResult = Result<std::pair<T, nsCString>, nsresult>;
} // namespace
bool PutCStringBytesToString(const nsACString& aSrc, nsString& aDest) {
const char* bufferData;
const size_t byteLength = aSrc.GetData(&bufferData);
const size_t shortLength = byteLength / sizeof(char16_t);
char16_t* destDataPtr;
const auto newLength = aDest.GetMutableData(&destDataPtr, shortLength);
if (newLength != shortLength) {
return false;
}
std::memcpy(static_cast<void*>(destDataPtr),
static_cast<const void*>(bufferData), byteLength);
return true;
}
LSValue::Converter::Converter(const LSValue& aValue) {
using ConversionType = LSValue::ConversionType;
using CompressionType = LSValue::CompressionType;
if (aValue.mBuffer.IsVoid()) {
mBuffer.SetIsVoid(true);
return;
}
const CompressionType compressionType = aValue.GetCompressionType();
const ConversionType conversionType = aValue.GetConversionType();
const nsCString uncompressed = [compressionType, &aValue]() {
if (CompressionType::UNCOMPRESSED != compressionType) {
nsCString buffer;
MOZ_ASSERT(CompressionType::SNAPPY == compressionType);
if (NS_WARN_IF(!SnappyUncompress(aValue.mBuffer, buffer))) {
buffer.Truncate();
}
return buffer;
}
return aValue.mBuffer;
}();
if (ConversionType::NONE != conversionType) {
MOZ_ASSERT(ConversionType::UTF16_UTF8 == conversionType);
if (NS_WARN_IF(!CopyUTF8toUTF16(uncompressed, mBuffer, fallible))) {
mBuffer.SetIsVoid(true);
}
return;
}
if (NS_WARN_IF(!PutCStringBytesToString(uncompressed, mBuffer))) {
mBuffer.SetIsVoid(true);
}
}
bool LSValue::InitFromString(const nsAString& aBuffer) {
MOZ_ASSERT(mBuffer.IsVoid());
MOZ_ASSERT(!mUTF16Length);
MOZ_ASSERT(ConversionType::NONE == mConversionType);
MOZ_ASSERT(CompressionType::UNCOMPRESSED == mCompressionType);
if (aBuffer.IsVoid()) {
return true;
}
const uint32_t utf16Length = aBuffer.Length();
const auto conversionRes = [&aBuffer]() -> TypeBufferResult<ConversionType> {
nsCString converted;
if (Utf16ValidUpTo(aBuffer) == aBuffer.Length()) {
if (NS_WARN_IF(!CopyUTF16toUTF8(aBuffer, converted, fallible))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
return std::pair{ConversionType::UTF16_UTF8, std::move(converted)};
}
if (NS_WARN_IF(!PutStringBytesToCString(aBuffer, converted))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
return std::pair{ConversionType::NONE, std::move(converted)};
}();
if (conversionRes.isErr()) {
return false;
}
const auto& [conversionType, converted] = conversionRes.inspect();
const auto compressionRes =
[&converted = converted]() -> TypeBufferResult<CompressionType> {
nsCString compressed;
if (NS_WARN_IF(!SnappyCompress(converted, compressed))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
if (!compressed.IsVoid()) {
return std::pair{CompressionType::SNAPPY, std::move(compressed)};
}
compressed = converted;
return std::pair{CompressionType::UNCOMPRESSED, std::move(compressed)};
}();
if (compressionRes.isErr()) {
return false;
}
const auto& [compressionType, compressed] = compressionRes.inspect();
mBuffer = compressed;
mUTF16Length = utf16Length;
mConversionType = conversionType;
mCompressionType = compressionType;
return true;
}
nsresult LSValue::InitFromStatement(mozIStorageStatement* aStatement,
uint32_t aIndex) {
MOZ_ASSERT(aStatement);
MOZ_ASSERT(mBuffer.IsVoid());
MOZ_ASSERT(!mUTF16Length);
MOZ_ASSERT(ConversionType::NONE == mConversionType);
MOZ_ASSERT(CompressionType::UNCOMPRESSED == mCompressionType);
int32_t utf16Length;
nsresult rv = aStatement->GetInt32(aIndex, &utf16Length);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
int32_t conversionType;
rv = aStatement->GetInt32(aIndex + 1, &conversionType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
int32_t compressionType;
rv = aStatement->GetInt32(aIndex + 2, &compressionType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsCString buffer;
rv = aStatement->GetBlobAsUTF8String(aIndex + 3, buffer);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBuffer = buffer;
mUTF16Length = static_cast<uint32_t>(utf16Length);
mConversionType = static_cast<decltype(mConversionType)>(conversionType);
mCompressionType = static_cast<decltype(mCompressionType)>(compressionType);
return NS_OK;
}
const LSValue& VoidLSValue() {
static const LSValue sVoidLSValue;
return sVoidLSValue;
}
} // namespace mozilla::dom
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