зеркало из https://github.com/mozilla/gecko-dev.git
68 строки
2.2 KiB
C++
68 строки
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "FileSystemHashSource.h"
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#include "mozilla/dom/FileSystemTypes.h"
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#include "mozilla/dom/data_encoding_ffi_generated.h"
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#include "mozilla/dom/quota/QuotaCommon.h"
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#include "nsComponentManagerUtils.h"
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#include "nsICryptoHash.h"
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#include "nsNetCID.h"
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#include "nsString.h"
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#include "nsStringFwd.h"
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namespace mozilla::dom::fs::data {
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Result<EntryId, QMResult> FileSystemHashSource::GenerateHash(
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const EntryId& aParent, const Name& aName) {
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auto makeHasher = [](nsresult* aRv) {
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return do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, aRv);
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};
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QM_TRY_INSPECT(const auto& hasher,
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QM_TO_RESULT_TRANSFORM(MOZ_TO_RESULT_GET_TYPED(
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nsCOMPtr<nsICryptoHash>, makeHasher)));
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QM_TRY(QM_TO_RESULT(hasher->Init(nsICryptoHash::SHA256)));
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QM_TRY(QM_TO_RESULT(
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hasher->Update(reinterpret_cast<const uint8_t*>(aName.BeginReading()),
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sizeof(char16_t) * aName.Length())));
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QM_TRY(QM_TO_RESULT(
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hasher->Update(reinterpret_cast<const uint8_t*>(aParent.BeginReading()),
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aParent.Length())));
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EntryId entryId;
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QM_TRY(QM_TO_RESULT(hasher->Finish(/* aASCII */ false, entryId)));
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MOZ_ASSERT(!entryId.IsEmpty());
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return entryId;
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}
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Result<Name, QMResult> FileSystemHashSource::EncodeHash(
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const EntryId& aEntryId) {
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MOZ_ASSERT(32u == aEntryId.Length());
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nsCString encoded;
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base32encode(&aEntryId, &encoded);
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// We are stripping last four padding characters because
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// it may not be allowed in some file systems.
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MOZ_ASSERT(56u == encoded.Length() && '=' == encoded[52u] &&
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'=' == encoded[53u] && '=' == encoded[54u] && '=' == encoded[55u]);
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encoded.SetLength(52u);
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Name result;
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QM_TRY(OkIf(result.SetCapacity(encoded.Length(), mozilla::fallible)),
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Err(QMResult(NS_ERROR_OUT_OF_MEMORY)));
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result.AppendASCII(encoded);
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return result;
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}
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} // namespace mozilla::dom::fs::data
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