e4ac11ebee
Adds relative partition sizing and placement options for both start and end sectors; improves hybrid MBR synchronization (deletes matching MBR partition when a GPT partition is deleted, warns about inconsistencies when verifying or writing a partition table).
84 lines
3.3 KiB
C++
84 lines
3.3 KiB
C++
/* bsd.h -- BSD disklabel data structure definitions, types, and functions */
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/* This program is copyright (c) 2009 by Roderick W. Smith. It is distributed
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under the terms of the GNU GPL version 2, as detailed in the COPYING file. */
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include "gptpart.h"
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#ifndef __BSD_STRUCTS
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#define __BSD_STRUCTS
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#define BSD_SIGNATURE UINT32_C(0x82564557) /* BSD disklabel signature ("magic") */
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#define LABEL_OFFSET1 64 /* BSD disklabels can start at one of these two */
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#define LABEL_OFFSET2 512 /* values; check both for valid signatures */
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// FreeBSD documents a maximum # of partitions of 8, but I saw 16 on a NetBSD
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// disk. I'm quadrupling that for further safety. Note that BSDReadData()
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// uses a 2048-byte I/O buffer. In combination with LABEL_OFFSET2 and the
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// additional 148-byte offset to the actual partition data, that gives a
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// theoretical maximum of 86.75 partitions that the program can handle.
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#define MAX_BSD_PARTS 64
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using namespace std;
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/****************************************
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* *
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* BSDData class and related structures *
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* *
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****************************************/
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// Possible states of the MBR
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enum BSDValidity {unknown, bsd_invalid, bsd};
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// Data for a single BSD partition record
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// Create entries for all fields, although we only use lengthLBA, firstLBA,
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// and fsType, to simplify loading the data from disk....
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struct BSDRecord { // the partition table
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uint32_t lengthLBA; // number of sectors in partition
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uint32_t firstLBA; // starting sector
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uint32_t fragSize; // filesystem basic fragment size
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uint8_t fsType; // filesystem type, see below
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uint8_t frag; // filesystem fragments per block
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uint16_t pcpg; // filesystem cylinders per group
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};
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// Full data in tweaked MBR format
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class BSDData {
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protected:
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// We only need a few items from the main BSD disklabel data structure....
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uint32_t signature; // the magic number
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uint32_t sectorSize; // # of bytes per sector
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uint32_t signature2; // the magic number (again)
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uint16_t numParts; // number of partitions in table
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BSDRecord* partitions; // partition array
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// Above are basic BSD disklabel data; now add more stuff....
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uint64_t labelFirstLBA; // first sector of BSD disklabel (partition or disk)
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uint64_t labelLastLBA; // final sector of BSD disklabel
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uint64_t labelStart; // BSD disklabel start point in bytes from labelFirstLBA
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BSDValidity state;
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public:
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BSDData(void);
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~BSDData(void);
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int ReadBSDData(char* deviceFilename, uint64_t startSector, uint64_t endSector);
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void ReadBSDData(int fd, uint64_t startSector, uint64_t endSector);
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void ReverseMetaBytes(void);
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void DisplayBSDData(void);
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int ShowState(void); // returns 1 if BSD disklabel detected
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int IsDisklabel(void) {return (state == bsd);}
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// Functions to extract data on specific partitions....
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uint8_t GetType(int i);
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uint64_t GetFirstSector(int i);
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uint64_t GetLength(int i);
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int GetNumParts(void);
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GPTPart AsGPT(int i); // Return BSD part. as GPT part.
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}; // struct MBRData
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#endif
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