iodev/vmware4.h

   1 /////////////////////////////////////////////////////////////////////////
   2 // $Id: vmware4.h,v 1.1 2006/12/17 08:17:28 vruppert Exp $
   3 /////////////////////////////////////////////////////////////////////////
   4
   5 /*
   6  * This file provides support for VMWare's virtual disk image
   7  * format version 4 and above.
   8  *
   9  * Author: Sharvil Nanavati
  10  * Contact: snrrrub@gmail.com
  11  *
  12  * Copyright (C) 2006 Sharvil Nanavati.
  13  *
  14  * This library is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU Lesser General Public
  16  * License as published by the Free Software Foundation; either
  17  * version 2.1 of the License, or (at your option) any later version.
  18  *
  19  * This library is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22  * Lesser General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Lesser General Public
  25  * License along with this library; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  */
  28
  29 #ifndef _VMWARE4_H
  30 #define _VMWARE4_H 1
  31
  32 class vmware4_image_t : public device_image_t
  33 {
  34     public:
  35         vmware4_image_t();
  36         virtual ~vmware4_image_t();
  37
  38         int open(const char* pathname);
  39         void close();
  40         Bit64s lseek(Bit64s offset, int whence);
  41         ssize_t read(void* buf, size_t count);
  42         ssize_t write(const void* buf, size_t count);
  43
  44     private:
  45         static const off_t INVALID_OFFSET;
  46         static const int SECTOR_SIZE;
  47
  48 #if defined(_MSC_VER)
  49 #pragma pack(push, 1)
  50 #elif defined(__MWERKS__) && defined(macintosh)
  51 #pragma options align=packed
  52 #endif
  53         typedef struct _VM4_Header
  54         {
  55             Bit8u  id[4];
  56             Bit32u version;
  57             Bit32u flags;
  58             Bit64u total_sectors;
  59             Bit64u tlb_size_sectors;
  60             Bit64u description_offset_sectors;
  61             Bit64u description_size_sectors;
  62             Bit32u slb_count;
  63             Bit64u flb_offset_sectors;
  64             Bit64u flb_copy_offset_sectors;
  65             Bit64u tlb_offset_sectors;
  66         }
  67 #if !defined(_MSC_VER)
  68         GCC_ATTRIBUTE((packed))
  69 #endif
  70         VM4_Header;
  71
  72 #if defined(_MSC_VER)
  73 #pragma pack(pop)
  74 #elif defined(__MWERKS__) && defined(macintosh)
  75 #pragma options align=reset
  76 #endif
  77
  78         bool is_open() const;
  79         bool is_valid_header() const;
  80
  81         bool read_header();
  82         off_t perform_seek();
  83         void flush();
  84         Bit32u read_block_index(Bit64u sector, Bit32u index);
  85         void write_block_index(Bit64u sector, Bit32u index, Bit32u block_sector);
  86
  87         int file_descriptor;
  88         VM4_Header header;
  89         Bit8u* tlb;
  90         off_t tlb_offset;
  91         off_t current_offset;
  92         bool is_dirty;
  93 };
  94
  95 #endif