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95 lines
3.7 KiB
95 lines
3.7 KiB
/* 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 "gptpart.h"
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#include "diskio.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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// BSD disklabels can start at offsets of 64 or the sector size -- at least,
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// I *THINK* that's what's going on. I've seen them at 64 or 512 on disks
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// with 512-byte blocks and at 2048 on disks with 2048-byte blocks. The
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// LABEL_OFFSET2 value will be replaced by the block size in the
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// ReadBSDData() function....
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#define LABEL_OFFSET1 64
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#define LABEL_OFFSET2 512
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#define NUM_OFFSETS 2
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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 4096-byte I/O buffer. In combination with LABEL_OFFSET3 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 118.75 partitions that the program can handle before
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// memory errors will occur.
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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 BSD format
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// For some reason this has to be packed or MS Visual C++'s debugger complains
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// about memory errors whenever a BSDData variable is destroyed.
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#pragma pack (8)
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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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struct 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(const string & deviceFilename, uint64_t startSector, uint64_t endSector);
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int ReadBSDData(DiskIO *myDisk, 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);
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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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#pragma pack ()
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#endif
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