content/base/src/nsDOMBlobBuilder.h
author Masatoshi Kimura <VYV03354@nifty.ne.jp>
Mon, 30 Jan 2012 11:33:59 +0100
changeset 86942 027e317d7b5cc475ef326845ff318310c3308ba5
parent 86941 50cc1a5530da3e92e0d4a614d0d4aec353c09196
child 89555 a771e4924188f8d6b3c6f99beb927fae0142f62b
permissions -rw-r--r--
Bug 696586 - Part 2: Add moz-blob response type and ability to access to the blob in progress events. r=jonas

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla File API.
 *
 * The Initial Developer of the Original Code is
 *   Kyle Huey <me@kylehuey.com>
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsDOMBlobBuilder_h
#define nsDOMBlobBuilder_h

#include "nsDOMFile.h"
#include "CheckedInt.h"

#include "mozilla/StdInt.h"

using namespace mozilla;

class nsDOMMultipartFile : public nsDOMFileBase
{
public:
  // Create as a file
  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> > aBlobs,
                     const nsAString& aName,
                     const nsAString& aContentType)
    : nsDOMFileBase(aName, aContentType, UINT64_MAX),
      mBlobs(aBlobs)
  {
  }

  // Create as a blob
  nsDOMMultipartFile(nsTArray<nsCOMPtr<nsIDOMBlob> > aBlobs,
                     const nsAString& aContentType)
    : nsDOMFileBase(aContentType, UINT64_MAX),
      mBlobs(aBlobs)
  {
  }

  already_AddRefed<nsIDOMBlob>
  CreateSlice(PRUint64 aStart, PRUint64 aLength, const nsAString& aContentType);

  NS_IMETHOD GetSize(PRUint64*);
  NS_IMETHOD GetInternalStream(nsIInputStream**);

protected:
  nsTArray<nsCOMPtr<nsIDOMBlob> > mBlobs;
};

class nsDOMBlobBuilder : public nsIDOMMozBlobBuilder
{
public:
  nsDOMBlobBuilder()
    : mData(nsnull), mDataLen(0), mDataBufferLen(0)
  {}

  NS_DECL_ISUPPORTS
  NS_DECL_NSIDOMMOZBLOBBUILDER

  nsresult GetBlobInternal(const nsAString& aContentType,
                           bool aClearBuffer, nsIDOMBlob** aBlob);
  nsresult AppendVoidPtr(const void* aData, PRUint32 aLength);

protected:
  nsresult AppendString(JSString* aString, JSContext* aCx);
  nsresult AppendBlob(nsIDOMBlob* aBlob);
  nsresult AppendArrayBuffer(JSObject* aBuffer);

  bool ExpandBufferSize(PRUint64 aSize)
  {
    if (mDataBufferLen >= mDataLen + aSize) {
      mDataLen += aSize;
      return true;
    }

    // Start at 1 or we'll loop forever.
    CheckedUint32 bufferLen = NS_MAX<PRUint32>(mDataBufferLen, 1);
    while (bufferLen.valid() && bufferLen.value() < mDataLen + aSize)
      bufferLen *= 2;

    if (!bufferLen.valid())
      return false;

    // PR_ memory functions are still fallible
    void* data = PR_Realloc(mData, bufferLen.value());
    if (!data)
      return false;

    mData = data;
    mDataBufferLen = bufferLen.value();
    mDataLen += aSize;
    return true;
  }

  void Flush() {
    if (mData) {
      // If we have some data, create a blob for it
      // and put it on the stack

      nsCOMPtr<nsIDOMBlob> blob =
        new nsDOMMemoryFile(mData, mDataLen, EmptyString(), EmptyString());
      mBlobs.AppendElement(blob);
      mData = nsnull; // The nsDOMMemoryFile takes ownership of the buffer
      mDataLen = 0;
      mDataBufferLen = 0;
    }
  }

  nsTArray<nsCOMPtr<nsIDOMBlob> > mBlobs;
  void* mData;
  PRUint64 mDataLen;
  PRUint64 mDataBufferLen;
};

#endif