gecko-dev/dom/file/Blob.cpp

/* -*- 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 "Blob.h"
#include "File.h"
#include "MemoryBlobImpl.h"
#include "mozilla/dom/BlobBinding.h"
#include "MultipartBlobImpl.h"
#include "nsIInputStream.h"
#include "nsPIDOMWindow.h"
#include "StreamBlobImpl.h"
#include "StringBlobImpl.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_CLASS(Blob)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Blob)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Blob)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Blob)
  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Blob)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMutable)
  NS_INTERFACE_MAP_ENTRY_CONCRETE(Blob)
  NS_INTERFACE_MAP_ENTRY(nsIMutable)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(Blob)
NS_IMPL_CYCLE_COLLECTING_RELEASE(Blob)

void
Blob::MakeValidBlobType(nsAString& aType)
{
  char16_t* iter = aType.BeginWriting();
  char16_t* end = aType.EndWriting();

  for ( ; iter != end; ++iter) {
    char16_t c = *iter;
    if (c < 0x20 || c > 0x7E) {
      // Non-ASCII char, bail out.
      aType.Truncate();
      return;
    }

    if (c >= 'A' && c <= 'Z') {
      *iter = c + ('a' - 'A');
    }
  }
}

/* static */ Blob*
Blob::Create(nsISupports* aParent, BlobImpl* aImpl)
{
  MOZ_ASSERT(aImpl);

  return aImpl->IsFile() ? new File(aParent, aImpl)
                         : new Blob(aParent, aImpl);
}

/* static */ already_AddRefed<Blob>
Blob::CreateStringBlob(nsISupports* aParent, const nsACString& aData,
                       const nsAString& aContentType)
{
  RefPtr<BlobImpl> blobImpl = StringBlobImpl::Create(aData, aContentType);
  RefPtr<Blob> blob = Blob::Create(aParent, blobImpl);
  MOZ_ASSERT(!blob->mImpl->IsFile());
  return blob.forget();
}

/* static */ already_AddRefed<Blob>
Blob::CreateMemoryBlob(nsISupports* aParent, void* aMemoryBuffer,
                       uint64_t aLength, const nsAString& aContentType)
{
  RefPtr<Blob> blob = Blob::Create(aParent,
    new MemoryBlobImpl(aMemoryBuffer, aLength, aContentType));
  MOZ_ASSERT(!blob->mImpl->IsFile());
  return blob.forget();
}

Blob::Blob(nsISupports* aParent, BlobImpl* aImpl)
  : mImpl(aImpl)
  , mParent(aParent)
{
  MOZ_ASSERT(mImpl);
}

Blob::~Blob()
{}

bool
Blob::IsFile() const
{
  return mImpl->IsFile();
}

const nsTArray<RefPtr<BlobImpl>>*
Blob::GetSubBlobImpls() const
{
  return mImpl->GetSubBlobImpls();
}

already_AddRefed<File>
Blob::ToFile()
{
  if (!mImpl->IsFile()) {
    return nullptr;
  }

  RefPtr<File> file;
  if (HasFileInterface()) {
    file = static_cast<File*>(this);
  } else {
    file = new File(mParent, mImpl);
  }

  return file.forget();
}

already_AddRefed<File>
Blob::ToFile(const nsAString& aName, ErrorResult& aRv) const
{
  AutoTArray<RefPtr<BlobImpl>, 1> blobImpls({mImpl});

  nsAutoString contentType;
  mImpl->GetType(contentType);

  RefPtr<MultipartBlobImpl> impl =
    MultipartBlobImpl::Create(std::move(blobImpls), aName, contentType, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  RefPtr<File> file = new File(mParent, impl);
  return file.forget();
}

already_AddRefed<Blob>
Blob::CreateSlice(uint64_t aStart, uint64_t aLength,
                  const nsAString& aContentType,
                  ErrorResult& aRv)
{
  RefPtr<BlobImpl> impl = mImpl->CreateSlice(aStart, aLength,
                                             aContentType, aRv);
  if (aRv.Failed()) {
    return nullptr;
  }

  RefPtr<Blob> blob = Blob::Create(mParent, impl);
  return blob.forget();
}

uint64_t
Blob::GetSize(ErrorResult& aRv)
{
  return mImpl->GetSize(aRv);
}

void
Blob::GetType(nsAString &aType)
{
  mImpl->GetType(aType);
}

already_AddRefed<Blob>
Blob::Slice(const Optional<int64_t>& aStart,
            const Optional<int64_t>& aEnd,
            const Optional<nsAString>& aContentType,
            ErrorResult& aRv)
{
  nsAutoString contentType;
  if (aContentType.WasPassed()) {
    contentType = aContentType.Value();
  }

  RefPtr<BlobImpl> impl =
    mImpl->Slice(aStart, aEnd, contentType, aRv);
  if (aRv.Failed()) {
    return nullptr;
  }

  RefPtr<Blob> blob = Blob::Create(mParent, impl);
  return blob.forget();
}

size_t
Blob::GetAllocationSize() const
{
  return mImpl->GetAllocationSize();
}

// contentTypeWithCharset can be set to the contentType or
// contentType+charset based on what the spec says.
// See: https://fetch.spec.whatwg.org/#concept-bodyinit-extract
nsresult
Blob::GetSendInfo(nsIInputStream** aBody,
                  uint64_t* aContentLength,
                  nsACString& aContentType,
                  nsACString& aCharset) const
{
  return mImpl->GetSendInfo(aBody, aContentLength, aContentType, aCharset);
}

NS_IMETHODIMP
Blob::GetMutable(bool* aMutable)
{
  return mImpl->GetMutable(aMutable);
}

NS_IMETHODIMP
Blob::SetMutable(bool aMutable)
{
  return mImpl->SetMutable(aMutable);
}

JSObject*
Blob::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return Blob_Binding::Wrap(aCx, this, aGivenProto);
}

/* static */ already_AddRefed<Blob>
Blob::Constructor(const GlobalObject& aGlobal,
                  const Optional<Sequence<BlobPart>>& aData,
                  const BlobPropertyBag& aBag,
                  ErrorResult& aRv)
{
  RefPtr<MultipartBlobImpl> impl = new MultipartBlobImpl();

  if (aData.WasPassed()) {
    nsAutoString type(aBag.mType);
    MakeValidBlobType(type);
    impl->InitializeBlob(aData.Value(), type,
                         aBag.mEndings == EndingTypes::Native, aRv);
  } else {
    impl->InitializeBlob(aRv);
  }

  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  MOZ_ASSERT(!impl->IsFile());

  RefPtr<Blob> blob = Blob::Create(aGlobal.GetAsSupports(), impl);
  return blob.forget();
}

int64_t
Blob::GetFileId()
{
  return mImpl->GetFileId();
}

bool
Blob::IsMemoryFile() const
{
  return mImpl->IsMemoryFile();
}

void
Blob::CreateInputStream(nsIInputStream** aStream, ErrorResult& aRv)
{
  mImpl->CreateInputStream(aStream, aRv);
}

size_t
BindingJSObjectMallocBytes(Blob* aBlob)
{
  MOZ_ASSERT(aBlob);
  return aBlob->GetAllocationSize();
}

} // namespace dom
} // namespace mozilla