imhex def

hfs.c

#pragma description HFS Device
// https://github.com/JotaRandom/hfsutils/blob/master/libhfs/apple.h#L27
#pragma endian big

#include <std/time.pat>

using MacOSHFSPlusDate = u32 [[format("::format_macos_date")]];
    
 fn format_macos_date(MacOSHFSPlusDate date) {
      return std::time::format(std::time::to_utc(date - 2082844800));
 };
    
enum ddType: u16 {
   MacOS = 1
};
 
struct Block0 {
  u16   sbSig; // 0x4552 magic
  u16   sbBlkSize; // 512
  u32   sbBlkCount;
  u16	sbDevType;	/* reserved */
  u16	sbDevId;	/* reserved */
  u32	sbData;		/* reserved */
  u16	sbDrvrCount;	/* number of driver descriptor entries */
  u32	ddBlock;	/* first driver's starting block */
  u16	ddSize;		/* size of the driver, in 512-byte blocks */
  ddType	ddType;		/* driver operating system type (MacOS = 1) */
  padding[486];	/* additional drivers, if any */
};

struct Partition {
  u16	pmSig;		/* partition signature (0x504d or 0x5453) */
  padding[2];	/* reserved */
  u32	pmMapBlkCnt;	/* number of blocks in partition map */
  u32	pmPyPartStart;	/* first physical block of partition */
  u32	pmPartBlkCnt;	/* number of blocks in partition */
  char	pmPartName[32];	/* partition name */
  char	pmParType[32];	/* partition type */
  u32	pmLgDataStart;	/* first logical block of data area */
  u32	pmDataCnt;	/* number of blocks in data area */
  u32	pmPartStatus;	/* partition status information */
  u32	pmLgBootStart;	/* first logical block of boot code */
  u32	pmBootSize;	/* size of boot code, in bytes */
  u32	pmBootAddr;	/* boot code load address */
  u32	pmBootAddr2;	/* reserved */
  u32	pmBootEntry;	/* boot code entry point */
  u32	pmBootEntry2;	/* reserved */
  u32	pmBootCksum;	/* boot code checksum */
  char	pmProcessor[17];/* processor type */
  padding[375];	/* reserved */
};
 
struct hfs_name {
	u8 len;
	u8 name[32];
};

struct HFS {
    Block0 block0;
    Partition pm;
    Partition driver;
    Partition hfs;
};


HFS hfs @ 0x00;

struct SCSIDriver {
 u8 driver[hfs.block0.ddSize * 512];
};

// TO
struct HFSVolume {
    u8 volume[(hfs.hfs.pmPartBlkCnt * 512)];
};
 
SCSIDriver scsidriver @ hfs.block0.ddBlock * 512;

// This takes a long time to evaulate on large devices
//HFSVolume vol @ hfs.hfs.pmPyPartStart * 512;