161 lines
4.0 KiB
C++
161 lines
4.0 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2012 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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/////////////////////////////////////////////////////////////////////////
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#ifndef BX_VPCIMG_H
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#define BX_VPCIMG_H
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#define HEADER_SIZE 512
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enum vhd_type {
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VHD_FIXED = 2,
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VHD_DYNAMIC = 3,
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VHD_DIFFERENCING = 4,
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};
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#if defined(_MSC_VER) && (_MSC_VER<1300)
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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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// always big-endian
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typedef
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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struct vhd_footer_t {
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Bit8u creator[8]; // "conectix"
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Bit32u features;
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Bit32u version;
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// Offset of next header structure, 0xFFFFFFFF if none
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Bit64u data_offset;
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// Seconds since Jan 1, 2000 0:00:00 (UTC)
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Bit32u timestamp;
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Bit8u creator_app[4]; // "vpc "
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Bit16u major;
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Bit16u minor;
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Bit8u creator_os[4]; // "Wi2k"
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Bit64u orig_size;
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Bit64u size;
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Bit16u cyls;
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Bit8u heads;
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Bit8u secs_per_cyl;
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Bit32u type;
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// Checksum of the Hard Disk Footer ("one's complement of the sum of all
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// the bytes in the footer without the checksum field")
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Bit32u checksum;
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// UUID used to identify a parent hard disk (backing file)
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Bit8u uuid[16];
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Bit8u in_saved_state;
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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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vhd_footer_t;
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typedef
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#if defined(_MSC_VER) && (_MSC_VER>=1300)
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__declspec(align(1))
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#endif
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struct vhd_dyndisk_header_t {
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Bit8u magic[8]; // "cxsparse"
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// Offset of next header structure, 0xFFFFFFFF if none
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Bit64u data_offset;
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// Offset of the Block Allocation Table (BAT)
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Bit64u table_offset;
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Bit32u version;
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Bit32u max_table_entries; // 32bit/entry
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// 2 MB by default, must be a power of two
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Bit32u block_size;
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Bit32u checksum;
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Bit8u parent_uuid[16];
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Bit32u parent_timestamp;
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Bit32u reserved;
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// Backing file name (in UTF-16)
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Bit8u parent_name[512];
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struct {
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Bit32u platform;
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Bit32u data_space;
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Bit32u data_length;
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Bit32u reserved;
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Bit64u data_offset;
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} parent_locator[8];
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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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vhd_dyndisk_header_t;
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#if defined(_MSC_VER) && (_MSC_VER<1300)
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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 vpc_image_t : public device_image_t
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{
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public:
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int open(const char* pathname);
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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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private:
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Bit32u vpc_checksum(Bit8u *buf, size_t size);
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Bit64s get_sector_offset(Bit64s sector_num, int write);
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int rewrite_footer(void);
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Bit64s alloc_block(Bit64s sector_num);
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int fd;
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Bit64s sector_count;
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Bit64s cur_sector;
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Bit8u footer_buf[HEADER_SIZE];
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Bit64u free_data_block_offset;
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int max_table_entries;
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Bit64u bat_offset;
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Bit64u last_bitmap_offset;
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Bit32u *pagetable;
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Bit32u block_size;
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Bit32u bitmap_size;
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};
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#endif
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