gecko/dom/file/ArchiveReader.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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_file_domarchivereader_h__
#define mozilla_dom_file_domarchivereader_h__

#include "nsWrapperCache.h"

#include "FileCommon.h"

#include "nsCOMArray.h"
#include "nsIChannel.h"
#include "nsIDOMFile.h"
#include "mozilla/Attributes.h"

namespace mozilla {
namespace dom {
class ArchiveReaderOptions;
class GlobalObject;
} // namespace dom
} // namespace mozilla

BEGIN_FILE_NAMESPACE

class ArchiveRequest;

/**
 * This is the ArchiveReader object
 */
class ArchiveReader MOZ_FINAL : public nsISupports,
                                public nsWrapperCache
{
public:
  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(ArchiveReader)

  static already_AddRefed<ArchiveReader>
  Constructor(const GlobalObject& aGlobal, nsIDOMBlob* aBlob,
              const ArchiveReaderOptions& aOptions, ErrorResult& aError);

  ArchiveReader(nsIDOMBlob* aBlob, nsPIDOMWindow* aWindow,
                const nsACString& aEncoding);

  nsIDOMWindow* GetParentObject() const
  {
    return mWindow;
  }
  virtual JSObject* WrapObject(JSContext* aCx,
                               JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;

  already_AddRefed<ArchiveRequest> GetFilenames();
  already_AddRefed<ArchiveRequest> GetFile(const nsAString& filename);
  already_AddRefed<ArchiveRequest> GetFiles();

  nsresult GetInputStream(nsIInputStream** aInputStream);
  nsresult GetSize(uint64_t* aSize);

  static bool PrefEnabled();

public: // for the ArchiveRequest:
  nsresult RegisterRequest(ArchiveRequest* aRequest);

public: // For events:
  void Ready(nsTArray<nsCOMPtr<nsIDOMFile> >& aFileList,
             nsresult aStatus);

private:
  ~ArchiveReader();

  already_AddRefed<ArchiveRequest> GenerateArchiveRequest();

  nsresult OpenArchive();

  void RequestReady(ArchiveRequest* aRequest);

protected:
  // The archive blob/file
  nsCOMPtr<nsIDOMBlob> mBlob;

  // The window is needed by the requests
  nsCOMPtr<nsPIDOMWindow> mWindow;

  // Are we ready to return data?
  enum {
    NOT_STARTED = 0,
    WORKING,
    READY
  } mStatus;

  // State of the read:
  enum {
    Header, // We are collecting the header: 30bytes
    Name,   // The name length is contained in the header
    Data,   // The length of the data segment COULD be written in the header
    Search  // ... if the data length is unknown (== 0) we wait until we read a new header 
  } mReadStatus;

  // List of requests to be processed
  nsTArray<nsRefPtr<ArchiveRequest> > mRequests;

  // Everything related to the blobs and the status:
  struct {
    nsTArray<nsCOMPtr<nsIDOMFile> > fileList;
    nsresult status;
  } mData;

  nsCString mEncoding;
};

END_FILE_NAMESPACE

#endif // mozilla_dom_file_domarchivereader_h__