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https://github.com/impulseadventure/jpegsnoop

JPEGsnoop: JPEG decoder and detailed analysis
https://github.com/impulseadventure/jpegsnoop

c corrupt decoder huffman image jpeg jpeg-decoder jpg mfc parser psd repair

Last synced: 4 days ago
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JPEGsnoop: JPEG decoder and detailed analysis

Host: GitHub
URL: https://github.com/impulseadventure/jpegsnoop
Owner: ImpulseAdventure
License: gpl-2.0
Created: 2017-04-30T15:25:25.000Z (over 7 years ago)
Default Branch: master
Last Pushed: 2023-08-09T22:23:17.000Z (over 1 year ago)
Last Synced: 2023-11-07T17:23:47.879Z (about 1 year ago)
Topics: c, corrupt, decoder, huffman, image, jpeg, jpeg-decoder, jpg, mfc, parser, psd, repair
Language: C++
Homepage: http://www.impulseadventure.com/photo/jpeg-snoop.html
Size: 2.72 MB
Stars: 448
Watchers: 31
Forks: 82
Open Issues: 47
Metadata Files:
- Readme: README-FILES.txt
- License: LICENSE.txt

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README

        ===============================================================================

                             JPEGsnoop - README

                               by Calvin Hass

            http://www.impulseadventure.com/photo/jpeg-snoop.html

===============================================================================

JPEGsnoop is a JPEG decoding and analysis utility written for Windows.

It reports all metadata contained within an image in addition to

the unique compression signatures that can be used to identify edited images.

JPEGsnoop is a portable application that does not require installation.

Contents:

1) Files

2) Acknowledgements

-------------------

1) FILES

-------------------

JPEGsnoop is written in Microsoft Visual Studio 2012 Pro (C++) using MFC.

The project is a SDI (Single Document Interface) with Document-View architecture.

Files are arranged as follows:

MFC User Interface

------------------

  JPEGsnoopDoc.*		- SDI Document class.

  JPEGsnoopView.*		- SDI View class (for top split window / textual output)

  JPEGsnoopViewImg.*	- SDI View class (for bottom split window / image output)

  MainFrm.*				- SDI Frame class. Contains status bar, toolbar and

                          code to support the splitter window.

Global Definitions

------------------

  snoop.h				- Global defines and debugging options. Primarily

						  used to denote current release version number.

Application

-----------

  CntrItem.*			- OLE container / RichEdit class

  DbSigs.*				- Compression signature database class

! Dib.*					- DIB (Bitmap) class

  DocLog.*				- Document logging helper routines

  FileTiff.*			- TIFF export routines

  General.*

! HyperlinkStatic.*		- Hyperlink class for dialog box static controls

  ImgDecode.*			- Image Decoder (for Scan segment)

  JfifDecode.*			- JFIF Parser

  JPEGsnoop.*

! Md5.*					- MD5 hash routines, used for compression signature

! Registry.*			- Windows Registry class 

  SnoopConfig.*			- Application configuration class

  stdafx.*				- Windows precompiled headers (auto-created)

! UrlString.*			- URL En/Decoding class

  WindowBuf.*			- File buffer / cache routines

UNUSED:

! CmdLine.*				- Command-line processing

! OperationDlg.*		- Progress dialog with cancel

NOTE: Files marked with "!" denote classes that have reused code from 

      other authors. Please see the acknowledgements section.

      

Supporting Dialog Boxes

-----------------------

  AboutDlg.*			- About dialog. Indicates version number and link to

						  website with updated releases.

  DbManageDlg.*			- Local signature database management dialog. This

						  dialog allows the user to view and delete the compression

						  signatures that have been saved locally.

  DbSubmitDlg.*			- Signature database submit dialog. This dialog provides an

						  opportunity for the user to describe a few characteristics

						  of the image signature that will be sent to the database.

  DecodeDetailDlg.*		- Detailed decode dialog. Asks the user for a starting MCU

						  coordinate and length to begin detailed decoding.

  ExportDlg.*			- Export JPEG dialog. Provides a few options in the JPEG

						  export process.

  ExportTiffDlg.*		- Export TIFF dialog. Provides a few options in the TIFF

						  export process.

  FolderDlg.*			- Generic folder select dialog.

  LookupDlg.*			- Lookup file offset from MCU dialog. User inputs MCU coordinate

						  and lookup returns file offset within scan segment.

  ModelessDlg.*			- Generic modeless dialog.

  NoteDlg.*				- Generic note dialog. This dialog is used to inform the

						  user of runtime messages or warnings.

  OffsetDlg.*			- File offset dialog. Provides the user with the ability to

						  specify a starting file offset for parsing/decoding.

  OperationDlg.*		- Progress dialog for lengthy operations.

  OverlayBufDlg.*		- File overlay dialog. This dialog presents the user with

						  the current hex values at a specific position within the file

						  and provides the user with the ability to overwrite one or

						  more bytes with new hex values.

  SettingsDlg.*			- Configuration settings dialog. Provides all major configuration

						  options to the user. The settings are saved in the registry.

  TermsDlg.*			- Terms and conditions dialog. The dialog presents the user with

						  the EULA and records whether the user accepted it.

  UpdateAvailDlg.*		- Release update available dialog. Informs the user of the

						  existence of a newer version of JPEGsnoop and offers the

						  option of launching a browser window to download the latest

						  version.

Compression Signature Database

------------------------------

  Signatures.inl		- The current built-in compression signatures database.

						  This file is currently generated from a PHP script

						  residing on the ImpulseAdventure.com website that

						  fetches the latest compression signatures from a

						  MySQL database.

-------------------

2) ACKNOWLEDGEMENTS

-------------------

I am very grateful to the following authors whose classes or concepts I have reused in

the development of JPEGsnoop.

  FolderDlg.cpp

  - MSDN Magazine

  Dib.cpp

  - MSDN?

  HyperlinkStatic.cpp

  - http://www.codeguru.com/cpp/controls/staticctrl/article.php/c5801

  - Franz Wong (http://www.codeguru.com/member.php/2259/)

  MD5.cpp

  - By RSA

  Registry.cpp

  - http://www.codeproject.com/KB/system/registryvars.aspx

  - Steve King

  - License: CPOL "Code Project Open License" http://www.codeproject.com/info/cpol10.aspx

  UrlString.cpp

  - Stephane Erhardt

  - http://www.codeguru.com/cpp/cpp/cpp_mfc/comments.php/c4029/?thread=9533

I also would like to give a special mention to Phil Harvey, the author of the

comprehensive ExifTool (http://www.sno.phy.queensu.ca/~phil/exiftool/). His work

in collating and documenting the vast set of EXIF tags has been incredibly helpful.