497 lines
14 KiB
C++
497 lines
14 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2005-2011 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 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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#ifndef BX_HDIMAGE_H
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#define BX_HDIMAGE_H
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// hdimage capabilities
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#define HDIMAGE_READONLY 1
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#define HDIMAGE_HAS_GEOMETRY 2
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#define HDIMAGE_AUTO_GEOMETRY 4
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// SPARSE IMAGES HEADER
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#define SPARSE_HEADER_MAGIC (0x02468ace)
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#define SPARSE_HEADER_VERSION 2
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#define SPARSE_HEADER_V1 1
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#define SPARSE_HEADER_SIZE (256) // Plenty of room for later
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#define SPARSE_PAGE_NOT_ALLOCATED (0xffffffff)
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typedef struct
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{
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Bit32u magic;
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Bit32u version;
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Bit32u pagesize;
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Bit32u numpages;
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Bit64u disk;
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Bit32u padding[58];
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} sparse_header_t;
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#define STANDARD_HEADER_MAGIC "Bochs Virtual HD Image"
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#define STANDARD_HEADER_V1 (0x00010000)
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#define STANDARD_HEADER_VERSION (0x00020000)
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#define STANDARD_HEADER_SIZE (512)
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// WARNING : headers are kept in x86 (little) endianness
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typedef struct
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{
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Bit8u magic[32];
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Bit8u type[16];
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Bit8u subtype[16];
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Bit32u version;
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Bit32u header;
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} standard_header_t;
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#define REDOLOG_TYPE "Redolog"
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#define REDOLOG_SUBTYPE_UNDOABLE "Undoable"
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#define REDOLOG_SUBTYPE_VOLATILE "Volatile"
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#define REDOLOG_SUBTYPE_GROWING "Growing"
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#define REDOLOG_PAGE_NOT_ALLOCATED (0xffffffff)
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#define UNDOABLE_REDOLOG_EXTENSION ".redolog"
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#define UNDOABLE_REDOLOG_EXTENSION_LENGTH (strlen(UNDOABLE_REDOLOG_EXTENSION))
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#define VOLATILE_REDOLOG_EXTENSION ".XXXXXX"
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#define VOLATILE_REDOLOG_EXTENSION_LENGTH (strlen(VOLATILE_REDOLOG_EXTENSION))
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typedef struct
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{
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// the fields in the header are kept in little endian
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Bit32u catalog; // #entries in the catalog
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Bit32u bitmap; // bitmap size in bytes
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Bit32u extent; // extent size in bytes
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Bit32u timestamp; // modification time in FAT format (subtype 'undoable' only)
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Bit64u disk; // disk size in bytes
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} redolog_specific_header_t;
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typedef struct
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{
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// the fields in the header are kept in little endian
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Bit32u catalog; // #entries in the catalog
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Bit32u bitmap; // bitmap size in bytes
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Bit32u extent; // extent size in bytes
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Bit64u disk; // disk size in bytes
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} redolog_specific_header_v1_t;
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typedef struct
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{
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standard_header_t standard;
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redolog_specific_header_t specific;
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Bit8u padding[STANDARD_HEADER_SIZE - (sizeof (standard_header_t) + sizeof (redolog_specific_header_t))];
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} redolog_header_t;
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typedef struct
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{
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standard_header_t standard;
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redolog_specific_header_v1_t specific;
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Bit8u padding[STANDARD_HEADER_SIZE - (sizeof (standard_header_t) + sizeof (redolog_specific_header_v1_t))];
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} redolog_header_v1_t;
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// htod : convert host to disk (little) endianness
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// dtoh : convert disk (little) to host endianness
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#if defined (BX_LITTLE_ENDIAN)
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#define htod32(val) (val)
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#define dtoh32(val) (val)
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#define htod64(val) (val)
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#define dtoh64(val) (val)
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#else
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#define htod32(val) bx_bswap32(val)
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#define dtoh32(val) htod32(val)
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#define htod64(val) bx_bswap64(val)
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#define dtoh64(val) htod64(val)
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#endif
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#ifndef HDIMAGE_HEADERS_ONLY
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int bx_read_image(int fd, Bit64s offset, void *buf, int count);
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int bx_write_image(int fd, Bit64s offset, void *buf, int count);
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class device_image_t
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{
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public:
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// Default constructor
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device_image_t();
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virtual ~device_image_t() {}
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// Open a image. Returns non-negative if successful.
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virtual int open(const char* pathname) = 0;
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// Close the image.
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virtual void close() = 0;
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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virtual Bit64s lseek(Bit64s offset, int whence) = 0;
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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virtual ssize_t read(void* buf, size_t count) = 0;
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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virtual ssize_t write(const void* buf, size_t count) = 0;
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// Get image capabilities
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virtual Bit32u get_capabilities();
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unsigned cylinders;
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unsigned heads;
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unsigned spt;
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Bit64u hd_size;
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};
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// FLAT MODE
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class default_image_t : public device_image_t
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{
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public:
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Open an image with specific flags. Returns non-negative if successful.
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int open(const char* pathname, int flags);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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// Get modification time in FAT format
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Bit32u get_timestamp();
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private:
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int fd;
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#ifndef WIN32
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time_t mtime;
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#else
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FILETIME mtime;
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#endif
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};
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// CONCAT MODE
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class concat_image_t : public device_image_t
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{
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public:
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// Default constructor
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concat_image_t();
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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#define BX_CONCAT_MAX_IMAGES 8
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int fd_table[BX_CONCAT_MAX_IMAGES];
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Bit64s start_offset_table[BX_CONCAT_MAX_IMAGES];
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Bit64s length_table[BX_CONCAT_MAX_IMAGES];
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void increment_string(char *str);
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int maxfd; // number of entries in tables that are valid
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// notice if anyone does sequential read or write without seek in between.
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// This can be supported pretty easily, but needs additional checks.
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// 0=something other than seek was last operation
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// 1=seek was last operation
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int seek_was_last_op;
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// the following variables tell which partial image file to use for
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// the next read and write.
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int index; // index into table
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int fd; // fd to use for reads and writes
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Bit64s thismin, thismax; // byte offset boundary of this image
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};
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// SPARSE MODE
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class sparse_image_t : public device_image_t
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{
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// Format of a sparse file:
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// 256 byte header, containing details such as page size and number of pages
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// Page indirection table, mapping virtual pages to physical pages within file
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// Physical pages till end of file
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public:
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// Default constructor
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sparse_image_t();
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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int fd;
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#ifdef _POSIX_MAPPED_FILES
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void * mmap_header;
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size_t mmap_length;
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size_t system_pagesize_mask;
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#endif
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Bit32u *pagetable;
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// Header is written to disk in little-endian (x86) format
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// Thus needs to be converted on big-endian systems before read
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// The pagetable is also kept little endian
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sparse_header_t header;
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Bit32u pagesize;
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int pagesize_shift;
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Bit32u pagesize_mask;
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Bit64s data_start;
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Bit64s underlying_filesize;
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char *pathname;
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Bit64s position;
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Bit32u position_virtual_page;
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Bit32u position_physical_page;
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Bit32u position_page_offset;
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Bit64s underlying_current_filepos;
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Bit64s total_size;
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void panic(const char * message);
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Bit64s get_physical_offset();
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void set_virtual_page(Bit32u new_virtual_page);
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void read_header();
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ssize_t read_page_fragment(Bit32u read_virtual_page, Bit32u read_page_offset, size_t read_size, void * buf);
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sparse_image_t *parent_image;
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};
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#if EXTERNAL_DISK_SIMULATOR
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#include "external-disk-simulator.h"
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#endif
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#if DLL_HD_SUPPORT
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class dll_image_t : public device_image_t
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{
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public:
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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int vunit,vblk;
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};
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#endif
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// REDOLOG class
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class redolog_t
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{
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public:
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redolog_t();
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int make_header(const char* type, Bit64u size);
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int create(const char* filename, const char* type, Bit64u size);
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int create(int filedes, const char* type, Bit64u size);
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int open(const char* filename, const char* type);
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void close();
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Bit64u get_size();
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Bit32u get_timestamp();
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bx_bool set_timestamp(Bit32u timestamp);
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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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private:
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void print_header();
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int fd;
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redolog_header_t header; // Header is kept in x86 (little) endianness
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Bit32u *catalog;
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Bit8u *bitmap;
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bx_bool bitmap_update;
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Bit32u extent_index;
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Bit32u extent_offset;
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Bit32u extent_next;
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Bit32u bitmap_blocks;
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Bit32u extent_blocks;
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Bit64s imagepos;
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};
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// GROWING MODE
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class growing_image_t : public device_image_t
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{
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public:
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// Contructor
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growing_image_t();
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virtual ~growing_image_t();
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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redolog_t *redolog;
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};
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// UNDOABLE MODE
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class undoable_image_t : public device_image_t
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{
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public:
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// Contructor
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undoable_image_t(const char* redolog_name);
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virtual ~undoable_image_t();
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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redolog_t *redolog; // Redolog instance
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default_image_t *ro_disk; // Read-only flat disk instance
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char *redolog_name; // Redolog name
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};
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// VOLATILE MODE
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class volatile_image_t : public device_image_t
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{
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public:
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// Contructor
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volatile_image_t(const char* redolog_name);
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virtual ~volatile_image_t();
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// Open a image. Returns non-negative if successful.
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int open(const char* pathname);
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// Close the image.
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void close();
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// Position ourselves. Return the resulting offset from the
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// beginning of the file.
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Bit64s lseek(Bit64s offset, int whence);
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// Read count bytes to the buffer buf. Return the number of
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// bytes read (count).
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ssize_t read(void* buf, size_t count);
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// Write count bytes from buf. Return the number of bytes
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// written (count).
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ssize_t write(const void* buf, size_t count);
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private:
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redolog_t *redolog; // Redolog instance
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default_image_t *ro_disk; // Read-only flat disk instance
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char *redolog_name; // Redolog name
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char *redolog_temp; // Redolog temporary file name
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};
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class bx_hdimage_ctl_c : public bx_hdimage_ctl_stub_c {
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public:
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bx_hdimage_ctl_c();
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virtual ~bx_hdimage_ctl_c() {}
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virtual device_image_t *init_image(Bit8u image_mode, Bit64u disk_size, const char *journal);
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#ifdef LOWLEVEL_CDROM
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virtual LOWLEVEL_CDROM* init_cdrom(const char *dev);
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#endif
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};
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#endif // HDIMAGE_HEADERS_ONLY
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#endif
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