FileSystemHashStorageFunction.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=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 "FileSystemHashStorageFunction.h"

#include "FileSystemHashSource.h"

#include "mozilla/dom/FileSystemTypes.h"

#include "mozilla/dom/quota/QuotaCommon.h"

#include "mozilla/storage/Variant.h"

#include "nsString.h"

#include "nsStringFwd.h"

namespace mozilla::dom::fs::data {

NS_IMPL_ISUPPORTS(FileSystemHashStorageFunction, mozIStorageFunction)

NS_IMETHODIMP

FileSystemHashStorageFunction::OnFunctionCall(

    mozIStorageValueArray* aFunctionArguments, nsIVariant** aResult) {

  MOZ_ASSERT(aFunctionArguments);

  MOZ_ASSERT(aResult);

  const int32_t parentIndex = 0;

  const int32_t childIndex = 1;

#ifdef DEBUG

    uint32_t argCount;

    MOZ_ALWAYS_SUCCEEDS(aFunctionArguments->GetNumEntries(&argCount));

    MOZ_ASSERT(argCount == 2u);

    int32_t parentType = mozIStorageValueArray::VALUE_TYPE_INTEGER;

    MOZ_ALWAYS_SUCCEEDS(

        aFunctionArguments->GetTypeOfIndex(parentIndex, &parentType));

    MOZ_ASSERT(parentType == mozIStorageValueArray::VALUE_TYPE_BLOB);

    int32_t childType = mozIStorageValueArray::VALUE_TYPE_INTEGER;

    MOZ_ALWAYS_SUCCEEDS(

        aFunctionArguments->GetTypeOfIndex(childIndex, &childType));

    MOZ_ASSERT(childType == mozIStorageValueArray::VALUE_TYPE_BLOB);

#endif

  QM_TRY_INSPECT(

      const EntryId& parentHash,

      MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(nsCString, aFunctionArguments,

                                        GetBlobAsUTF8String, parentIndex));

  QM_TRY_INSPECT(const Name& childName, MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(

                                            nsString, aFunctionArguments,

                                            GetBlobAsString, childIndex));

  QM_TRY_INSPECT(const EntryId& buffer,

                 FileSystemHashSource::GenerateHash(parentHash, childName)

                     .mapErr([](const auto& aRv) { return ToNSResult(aRv); }));

  nsCOMPtr<nsIVariant> result =

      new mozilla::storage::BlobVariant(std::make_pair(

          static_cast<const void*>(buffer.get()), int(buffer.Length())));

  result.forget(aResult);

  return NS_OK;

}  // namespace mozilla::dom::fs::data