dom/indexedDB/IndexedDBCommon.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "IndexedDBCommon.h"
   8
   9 #include "js/StructuredClone.h"
  10 #include "mozilla/SnappyUncompressInputStream.h"
  11
  12 namespace mozilla::dom::indexedDB {
  13
  14 // aStructuredCloneData is a parameter rather than a return value because one
  15 // caller preallocates it on the heap not immediately before calling for some
  16 // reason. Maybe this could be changed.
  17 nsresult SnappyUncompressStructuredCloneData(
  18     nsIInputStream& aInputStream, JSStructuredCloneData& aStructuredCloneData) {
  19   const auto snappyInputStream =
  20       MakeRefPtr<SnappyUncompressInputStream>(&aInputStream);
  21
  22   char buffer[kFileCopyBufferSize];
  23
  24   QM_TRY(CollectEach(
  25       [&snappyInputStream = *snappyInputStream, &buffer] {
  26         QM_TRY_RETURN(MOZ_TO_RESULT_INVOKE_MEMBER(snappyInputStream, Read,
  27                                                   buffer, sizeof(buffer)));
  28       },
  29       [&aStructuredCloneData,
  30        &buffer](const uint32_t& numRead) -> Result<Ok, nsresult> {
  31         QM_TRY(OkIf(aStructuredCloneData.AppendBytes(buffer, numRead)),
  32                Err(NS_ERROR_OUT_OF_MEMORY));
  33
  34         return Ok{};
  35       }));
  36
  37   return NS_OK;
  38 }
  39
  40 }  // namespace mozilla::dom::indexedDB