122 lines
4.1 KiB
C
122 lines
4.1 KiB
C
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/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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/*
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* This file provides support for the following VBox virtual
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* disk image formats: VDI.
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*
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* Author: Benjamin D Lunt
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* Contact: fys [at] fysnet [dot] net
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*
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* Copyright (C) 2015 Benjamin D Lunt.
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* Copyright (C) 2006-2015 The Bochs Project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _VBOX_H
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#define _VBOX_H 1
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#if defined(_MSC_VER)
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#pragma pack(push, 1)
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#elif defined(__MWERKS__) && defined(macintosh)
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#pragma options align=packed
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#endif
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typedef struct _VBOX_VDI_Header
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{
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Bit8u id[64]; // "<<< Sun xVM VirtualBox Disk Image >>>" + LF + Padding NULLs
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Bit32u signature; // image signature
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Bit32u version; // version (max.min) (two 16-bit words)
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Bit32u header_size; // size of header (0x190 ?)
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Bit32u image_type; // image type (1 = Dynamic VDI, 2 = Static VDI)
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Bit32u flags; // image flags
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Bit8u description[256]; // image description
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Bit32u offset_blocks; // byte offset to mapped area
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Bit32u offset_data; // byte offset to data area (actual data blocks)
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Bit32u cylinders; // number of cylinders
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Bit32u heads; // number of heads
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Bit32u sectors; // number of sectors
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Bit32u sector_size; // sector size in bytes
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Bit32u resv; // unused
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Bit64u disk_size; // disk size in bytes
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Bit32u block_size; // block size
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Bit32u block_extra; // block extra data
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Bit32u blocks_in_hdd; // total number of blocks in HDD (count of entries in map)
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Bit32u blocks_allocated; // number of blocks allocated
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Bit8u uuid_this[16]; // UUID of this VDI
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Bit8u uuid_snap[16]; // UUID of last SNAP
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Bit8u uuid_link[16]; // UUID link
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Bit8u uuid_parent[16]; // UUID parent
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Bit8u padding[56]; // padding to end of header
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}
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#if !defined(_MSC_VER)
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GCC_ATTRIBUTE((packed))
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#endif
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VBOX_VDI_Header;
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#if defined(_MSC_VER)
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#pragma pack(pop)
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#elif defined(__MWERKS__) && defined(macintosh)
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#pragma options align=reset
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#endif
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class vbox_image_t : public device_image_t
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{
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public:
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vbox_image_t();
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virtual ~vbox_image_t();
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int open(const char* pathname, int flags);
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void close();
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Bit64s lseek(Bit64s offset, int whence);
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ssize_t read(void* buf, size_t count);
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ssize_t write(const void* buf, size_t count);
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Bit32u get_capabilities();
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static int check_format(int fd, Bit64u imgsize);
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#ifndef BXIMAGE
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bx_bool save_state(const char *backup_fname);
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void restore_state(const char *backup_fname);
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#endif
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private:
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static const off_t INVALID_OFFSET;
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static const int SECTOR_SIZE;
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bx_bool is_open() const;
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bx_bool read_header();
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off_t perform_seek();
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void flush();
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void read_block(const Bit32u index);
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void write_block(const Bit32u index);
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int file_descriptor;
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VBOX_VDI_Header header;
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Bit32s *mtlb;
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Bit8u *block_data;
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off_t current_offset;
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Bit32u mtlb_sector;
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bx_bool is_dirty;
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bx_bool mtlb_dirty;
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bx_bool header_dirty;
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const char *pathname;
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};
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#endif
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