widget/nsPrimitiveHelpers.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   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 #ifndef nsPrimitiveHelpers_h___
   8 #define nsPrimitiveHelpers_h___
   9
  10 #include "nsError.h"
  11 #include "nscore.h"
  12 #include "nsString.h"
  13
  14 class nsISupports;
  15
  16 class nsPrimitiveHelpers {
  17  public:
  18   // Given some data and the flavor it corresponds to, creates the appropriate
  19   // nsISupports* wrapper for passing across IDL boundaries. The length
  20   // parameter should not include the null if the data is null terminated.
  21   static void CreatePrimitiveForData(const nsACString& aFlavor,
  22                                      const void* aDataBuff, uint32_t aDataLen,
  23                                      nsISupports** aPrimitive);
  24
  25   // A specific case of CreatePrimitive for windows CF_HTML handling in
  26   // DataTransfer
  27   static void CreatePrimitiveForCFHTML(const void* aDataBuff,
  28                                        uint32_t* aDataLen,
  29                                        nsISupports** aPrimitive);
  30
  31   // Given a nsISupports* primitive and the flavor it represents, creates a new
  32   // data buffer with the data in it. This data will be null terminated, but the
  33   // length parameter does not reflect that.
  34   static void CreateDataFromPrimitive(const nsACString& aFlavor,
  35                                       nsISupports* aPrimitive, void** aDataBuff,
  36                                       uint32_t* aDataLen);
  37
  38 };  // class nsPrimitiveHelpers
  39
  40 class nsLinebreakHelpers {
  41  public:
  42   // Given some data, convert from the platform linebreaks into the LF expected
  43   // by the DOM. This will attempt to convert the data in place, but the buffer
  44   // may still need to be reallocated regardless (disposing the old buffer is
  45   // taken care of internally, see the note below).
  46   //
  47   // NOTE: this assumes that it can use 'free' to dispose of the old buffer.
  48   static nsresult ConvertPlatformToDOMLinebreaks(bool aIsSingleByteChars,
  49                                                  void** ioData,
  50                                                  int32_t* ioLengthInBytes);
  51
  52 };  // class nsLinebreakHelpers
  53
  54 #endif  // nsPrimitiveHelpers_h___