VHD Sherlock
------------
 Analyse VHD image files

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

 Description:
  This program is useful to analyse the structure of a VHD file.
  It currently supports Fixed Hard Disk, Dynamic Hard Disk and
  Differencing Hard Disk images.

  It follows Microsoft VHD Image Format Specification, available
  on the Microsoft website.

 Compile:
  gcc -o sherlock sherlock.c -Wall -O3 -s

 Usage:
  ./sherlock [ -h ] [ -v[v] ] <file>
      -h      Print this help message and quit
      -v      Increase verbose level (may be used multiple times)
      -c      Read VHD footer *copy* only (for corrupted VHDs with no footer)
      <file>  VHD file to examine

  If no -v option is specified, sherlock will run and return 0
  without any output, unless the VHD file is detected to be
  corrupted.
  Using -v cause it to print what is being checked.
  Using -vv cause it to print the headers analysed as well.
  Using -vvv cause it to print the bat and bitmaps as well.

 CHANGELOG:
   2011.10.27 - Felipe Franciosi
    - Program creation.
    - Basic dump of VHD Footer Copy and VHD Dynamic Disk Header.
 
   2011.10.28 - Felipe Franciosi
    - Improved output of some fields.
 
   2011.10.31 - Felipe Franciosi
    - Reads footer first, then everything else accordingly.
 
   2011.11.07 - Felipe Franciosi
    - Added option to read footer copy exclusively.
 
   2011.11.17 - Felipe Franciosi
    - Now every header has its cookie properly checked.
 
  TODO:
   - Validate checksums
   - Validate the consistency of the VHD (i.e. compare footers)
   - Analyse a VHD chain