bsd.h

/* bsd.h -- BSD disklabel data structure definitions, types, and functions */

/* This program is copyright (c) 2009 by Roderick W. Smith. It is distributed
  under the terms of the GNU GPL version 2, as detailed in the COPYING file. */

#include <stdint.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include "gptpart.h"

#ifndef __BSD_STRUCTS
#define __BSD_STRUCTS

#define BSD_SIGNATURE UINT32_C(0x82564557)

#define LABEL_OFFSET1 64   /* BSD disklabels can start at one of these two */
#define LABEL_OFFSET2 512  /* values; check both for valid signatures */

// FreeBSD documents a maximum # of partitions of 8, but I saw 16 on a NetBSD
// disk. I'm quadrupling that for further safety. Note that BSDReadData()
// uses a 2048-byte I/O buffer. In combination with LABEL_OFFSET2 and the
// additional 148-byte offset to the actual partition data, that gives a
// theoretical maximum of 86.75 partitions that the program can handle.
#define MAX_BSD_PARTS 64


using namespace std;

/****************************************
 *                                      *
 * BSDData class and related structures *
 *                                      *
 ****************************************/

// Possible states of the MBR
enum BSDValidity {unknown, bsd_invalid, bsd};

// Data for a single BSD partition record
struct  BSDRecord {     // the partition table
   uint32_t  lengthLBA;     // number of sectors in partition
   uint32_t  firstLBA;   // starting sector
   uint32_t  fragSize;    // filesystem basic fragment size
   uint8_t  fsType;    // filesystem type, see below
   uint8_t  frag;      // filesystem fragments per block
   uint16_t pcpg;  /* filesystem cylinders per group */ // was u_uint16_t
};

// Full data in tweaked MBR format
class BSDData {
   protected:
      // We only need a few items from the main BSD disklabel data structure....
      uint32_t  signature;             // the magic number
      uint32_t  sectorSize;      // # of bytes per sector
      uint32_t  signature2;         // the magic number (again)
      uint16_t numParts;            // number of partitions in table
      BSDRecord* partitions;        // partition array

      // Above are basic BSD disklabel data; now add more stuff....
//      uint64_t offset; // starting point in blocks
      uint64_t labelStart; // BSD disklabel start point in bytes from firstLBA
      uint64_t labelFirstLBA; // first sector of BSD disklabel (partition or disk)
      uint64_t labelLastLBA; // final sector of BSD disklabel
//      char deviceFilename[256];
      BSDValidity state;
//      struct BSDRecord* GetPartition(int i); // Return BSD partition
   public:
      BSDData(void);
      ~BSDData(void);
      int ReadBSDData(char* deviceFilename, uint64_t startSector, uint64_t endSector);
      void ReadBSDData(int fd, uint64_t startSector, uint64_t endSector);
      void ReverseMetaBytes(void);
      void DisplayBSDData(void);
//      int ConvertBSDParts(struct GPTPartition gptParts[]);
      int ShowState(void); // returns 1 if BSD disklabel detected
      int IsDisklabel(void) {return (state == bsd);}

      // Functions to extract data on specific partitions....
      uint8_t GetType(int i);
      uint64_t GetFirstSector(int i);
      uint64_t GetLength(int i);
      int GetNumParts(void);
      GPTPart AsGPT(int i); // Return BSD part. as GPT part.
}; // struct MBRData

#endif