gecko-dev/dom/file/BaseBlobImpl.h

/* -*- 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/. */

#ifndef mozilla_dom_BaseBlobImpl_h
#define mozilla_dom_BaseBlobImpl_h

#include "mozilla/dom/BlobImpl.h"

namespace mozilla {
namespace dom {

class BaseBlobImpl : public BlobImpl
{
public:
  BaseBlobImpl(const nsAString& aName, const nsAString& aContentType,
               uint64_t aLength, int64_t aLastModifiedDate)
    : mIsFile(true)
    , mImmutable(false)
    , mContentType(aContentType)
    , mName(aName)
    , mStart(0)
    , mLength(aLength)
    , mLastModificationDate(aLastModifiedDate)
    , mSerialNumber(NextSerialNumber())
  {
    // Ensure non-null mContentType by default
    mContentType.SetIsVoid(false);
  }

  BaseBlobImpl(const nsAString& aName, const nsAString& aContentType,
               uint64_t aLength)
    : mIsFile(true)
    , mImmutable(false)
    , mContentType(aContentType)
    , mName(aName)
    , mStart(0)
    , mLength(aLength)
    , mLastModificationDate(INT64_MAX)
    , mSerialNumber(NextSerialNumber())
  {
    // Ensure non-null mContentType by default
    mContentType.SetIsVoid(false);
  }

  BaseBlobImpl(const nsAString& aContentType, uint64_t aLength)
    : mIsFile(false)
    , mImmutable(false)
    , mContentType(aContentType)
    , mStart(0)
    , mLength(aLength)
    , mLastModificationDate(INT64_MAX)
    , mSerialNumber(NextSerialNumber())
  {
    // Ensure non-null mContentType by default
    mContentType.SetIsVoid(false);
  }

  BaseBlobImpl(const nsAString& aContentType, uint64_t aStart,
               uint64_t aLength)
    : mIsFile(false)
    , mImmutable(false)
    , mContentType(aContentType)
    , mStart(aStart)
    , mLength(aLength)
    , mLastModificationDate(INT64_MAX)
    , mSerialNumber(NextSerialNumber())
  {
    MOZ_ASSERT(aLength != UINT64_MAX, "Must know length when creating slice");
    // Ensure non-null mContentType by default
    mContentType.SetIsVoid(false);
  }

  virtual void GetName(nsAString& aName) const override;

  virtual void GetDOMPath(nsAString& aName) const override;

  virtual void SetDOMPath(const nsAString& aName) override;

  virtual int64_t GetLastModified(ErrorResult& aRv) override;

  virtual void SetLastModified(int64_t aLastModified) override;

  virtual void GetMozFullPath(nsAString& aName,
                              SystemCallerGuarantee /* unused */,
                              ErrorResult& aRv) const override;

  virtual void GetMozFullPathInternal(nsAString& aFileName,
                                      ErrorResult& aRv) const override;

  virtual uint64_t GetSize(ErrorResult& aRv) override
  {
    return mLength;
  }

  virtual void GetType(nsAString& aType) override;

  size_t GetAllocationSize() const override
  {
    return 0;
  }

  size_t GetAllocationSize(FallibleTArray<BlobImpl*>& aVisitedBlobImpls) const override
  {
    return GetAllocationSize();
  }

  virtual uint64_t GetSerialNumber() const override { return mSerialNumber; }

  virtual already_AddRefed<BlobImpl>
  CreateSlice(uint64_t aStart, uint64_t aLength,
              const nsAString& aContentType, ErrorResult& aRv) override
  {
    return nullptr;
  }

  virtual const nsTArray<RefPtr<BlobImpl>>*
  GetSubBlobImpls() const override
  {
    return nullptr;
  }

  virtual void CreateInputStream(nsIInputStream** aStream,
                                 ErrorResult& aRv) override
  {
    aRv.Throw(NS_ERROR_NOT_IMPLEMENTED);
  }

  virtual int64_t GetFileId() override;

  virtual nsresult GetSendInfo(nsIInputStream** aBody,
                               uint64_t* aContentLength,
                               nsACString& aContentType,
                               nsACString& aCharset) override;

  virtual nsresult GetMutable(bool* aMutable) const override;

  virtual nsresult SetMutable(bool aMutable) override;

  virtual void
  SetLazyData(const nsAString& aName, const nsAString& aContentType,
              uint64_t aLength, int64_t aLastModifiedDate) override
  {
    mName = aName;
    mContentType = aContentType;
    mLength = aLength;
    mLastModificationDate = aLastModifiedDate;
    mIsFile = !aName.IsVoid();
  }

  virtual bool IsMemoryFile() const override
  {
    return false;
  }

  virtual bool IsDateUnknown() const override
  {
    return mIsFile && mLastModificationDate == INT64_MAX;
  }

  virtual bool IsFile() const override
  {
    return mIsFile;
  }

  virtual bool IsSizeUnknown() const override
  {
    return mLength == UINT64_MAX;
  }

protected:
  virtual ~BaseBlobImpl() {}

  /**
   * Returns a new, effectively-unique serial number. This should be used
   * by implementations to obtain a serial number for GetSerialNumber().
   * The implementation is thread safe.
   */
  static uint64_t NextSerialNumber();

  bool mIsFile;
  bool mImmutable;

  nsString mContentType;
  nsString mName;
  nsString mPath; // The path relative to a directory chosen by the user

  uint64_t mStart;
  uint64_t mLength;

  int64_t mLastModificationDate;

  const uint64_t mSerialNumber;
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_BaseBlobImpl_h