diff options
Diffstat (limited to '')
-rw-r--r-- | dom/fs/parent/FileSystemHashSource.cpp | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/dom/fs/parent/FileSystemHashSource.cpp b/dom/fs/parent/FileSystemHashSource.cpp new file mode 100644 index 0000000000..eb43575371 --- /dev/null +++ b/dom/fs/parent/FileSystemHashSource.cpp @@ -0,0 +1,67 @@ +/* -*- 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 "FileSystemHashSource.h" + +#include "mozilla/dom/FileSystemTypes.h" +#include "mozilla/dom/data_encoding_ffi_generated.h" +#include "mozilla/dom/quota/QuotaCommon.h" +#include "nsComponentManagerUtils.h" +#include "nsICryptoHash.h" +#include "nsNetCID.h" +#include "nsString.h" +#include "nsStringFwd.h" + +namespace mozilla::dom::fs::data { + +Result<EntryId, QMResult> FileSystemHashSource::GenerateHash( + const EntryId& aParent, const Name& aName) { + auto makeHasher = [](nsresult* aRv) { + return do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, aRv); + }; + QM_TRY_INSPECT(const auto& hasher, + QM_TO_RESULT_TRANSFORM(MOZ_TO_RESULT_GET_TYPED( + nsCOMPtr<nsICryptoHash>, makeHasher))); + + QM_TRY(QM_TO_RESULT(hasher->Init(nsICryptoHash::SHA256))); + + QM_TRY(QM_TO_RESULT( + hasher->Update(reinterpret_cast<const uint8_t*>(aName.BeginReading()), + sizeof(char16_t) * aName.Length()))); + + QM_TRY(QM_TO_RESULT( + hasher->Update(reinterpret_cast<const uint8_t*>(aParent.BeginReading()), + aParent.Length()))); + + EntryId entryId; + QM_TRY(QM_TO_RESULT(hasher->Finish(/* aASCII */ false, entryId))); + MOZ_ASSERT(!entryId.IsEmpty()); + + return entryId; +} + +Result<Name, QMResult> FileSystemHashSource::EncodeHash( + const EntryId& aEntryId) { + MOZ_ASSERT(32u == aEntryId.Length()); + nsCString encoded; + base32encode(&aEntryId, &encoded); + + // We are stripping last four padding characters because + // it may not be allowed in some file systems. + MOZ_ASSERT(56u == encoded.Length() && '=' == encoded[52u] && + '=' == encoded[53u] && '=' == encoded[54u] && '=' == encoded[55u]); + encoded.SetLength(52u); + + Name result; + QM_TRY(OkIf(result.SetCapacity(encoded.Length(), mozilla::fallible)), + Err(QMResult(NS_ERROR_OUT_OF_MEMORY))); + + result.AppendASCII(encoded); + + return result; +} + +} // namespace mozilla::dom::fs::data |