The Tor Browser: image/decoders/nsJPEGDecoder.h@ac0c01689b40

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     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/. */

     7 #ifndef nsJPEGDecoder_h__

     8 #define nsJPEGDecoder_h__

    10 #include "RasterImage.h"

    11 /* On Windows systems, RasterImage.h brings in 'windows.h', which defines INT32.

    12  * But the jpeg decoder has its own definition of INT32. To avoid build issues,

    13  * we need to undefine the version from 'windows.h'. */

    14 #undef INT32

    16 #include "Decoder.h"

    18 #include "nsAutoPtr.h"

    20 #include "nsIInputStream.h"

    21 #include "nsIPipe.h"

    22 #include "qcms.h"

    24 extern "C" {

    25 #include "jpeglib.h"

    26 }

    28 #include <setjmp.h>

    30 namespace mozilla {

    31 namespace image {

    33 typedef struct {

    34     struct jpeg_error_mgr pub;  /* "public" fields for IJG library*/

    35     jmp_buf setjmp_buffer;      /* For handling catastropic errors */

    36 } decoder_error_mgr;

    38 typedef enum {

    39     JPEG_HEADER,                          /* Reading JFIF headers */

    40     JPEG_START_DECOMPRESS,

    41     JPEG_DECOMPRESS_PROGRESSIVE,          /* Output progressive pixels */

    42     JPEG_DECOMPRESS_SEQUENTIAL,           /* Output sequential pixels */

    43     JPEG_DONE,

    44     JPEG_SINK_NON_JPEG_TRAILER,          /* Some image files have a */

    45                                          /* non-JPEG trailer */

    46     JPEG_ERROR

    47 } jstate;

    49 class RasterImage;

    50 class Orientation;

    52 class nsJPEGDecoder : public Decoder

    53 {

    54 public:

    55   nsJPEGDecoder(RasterImage &aImage, Decoder::DecodeStyle aDecodeStyle);

    56   virtual ~nsJPEGDecoder();

    58   virtual void InitInternal();

    59   virtual void WriteInternal(const char* aBuffer, uint32_t aCount, DecodeStrategy aStrategy);

    60   virtual void FinishInternal();

    62   virtual Telemetry::ID SpeedHistogram();

    63   void NotifyDone();

    65 protected:

    66   Orientation ReadOrientationFromEXIF();

    67   void OutputScanlines(bool* suspend);

    69 public:

    70   struct jpeg_decompress_struct mInfo;

    71   struct jpeg_source_mgr mSourceMgr;

    72   decoder_error_mgr mErr;

    73   jstate mState;

    75   uint32_t mBytesToSkip;

    77   const JOCTET *mSegment;   // The current segment we are decoding from

    78   uint32_t mSegmentLen;     // amount of data in mSegment

    80   JOCTET *mBackBuffer;

    81   uint32_t mBackBufferLen; // Offset of end of active backtrack data

    82   uint32_t mBackBufferSize; // size in bytes what mBackBuffer was created with

    83   uint32_t mBackBufferUnreadLen; // amount of data currently in mBackBuffer

    85   JOCTET  *mProfile;

    86   uint32_t mProfileLength;

    88   qcms_profile *mInProfile;

    89   qcms_transform *mTransform;

    91   bool mReading;

    93   const Decoder::DecodeStyle mDecodeStyle;

    95   uint32_t mCMSMode;

    96 };

    98 } // namespace image

    99 } // namespace mozilla

   101 #endif // nsJPEGDecoder_h__

The Tor Browser / file revision

image/decoders/nsJPEGDecoder.h@ac0c01689b40

image/decoders/nsJPEGDecoder.h