#ifndef HFSPLUS_H
#define HFSPLUS_H

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>


#include "common.h"

#define READ(a, b, c, d) ((*((a)->read))(a, b, c, d))
#define WRITE(a, b, c, d) ((*((a)->write))(a, b, c, d))
#define CLOSE(a) ((*((a)->close))(a))
#define COMPARE(a, b, c) ((*((a)->compare))(b, c))
#define READ_KEY(a, b, c) ((*((a)->keyRead))(b, c))
#define WRITE_KEY(a, b, c, d) ((*((a)->keyWrite))(b, c, d))
#define READ_DATA(a, b, c) ((*((a)->dataRead))(b, c))

struct BTKey {
  uint16_t keyLength;
  unsigned char data[0];
} __attribute__((__packed__));

typedef struct BTKey BTKey;

typedef BTKey* (*dataReadFunc)(off_t offset, struct io_func_struct* io);
typedef void (*keyPrintFunc)(BTKey* toPrint);
typedef int (*keyWriteFunc)(off_t offset, BTKey* toWrite, struct io_func_struct* io);
typedef int (*compareFunc)(BTKey* left, BTKey* right);

typedef uint32_t HFSCatalogNodeID;

enum {
    kHFSRootParentID            = 1,
    kHFSRootFolderID            = 2,
    kHFSExtentsFileID           = 3,
    kHFSCatalogFileID           = 4,
    kHFSBadBlockFileID          = 5,
    kHFSAllocationFileID        = 6,
    kHFSStartupFileID           = 7,
    kHFSAttributesFileID        = 8,
    kHFSRepairCatalogFileID     = 14,
    kHFSBogusExtentFileID       = 15,
    kHFSFirstUserCatalogNodeID  = 16
};

#define STR_SIZE(str) (sizeof(uint16_t) + (sizeof(uint16_t) * (str).length))

struct HFSUniStr255 {
    uint16_t  length;
    uint16_t unicode[255];
} __attribute__((__packed__));
typedef struct HFSUniStr255 HFSUniStr255;
typedef const  HFSUniStr255 *ConstHFSUniStr255Param;

struct HFSPlusExtentDescriptor {
    uint32_t startBlock;
    uint32_t blockCount;
} __attribute__((__packed__));
typedef struct HFSPlusExtentDescriptor HFSPlusExtentDescriptor;

typedef HFSPlusExtentDescriptor HFSPlusExtentRecord[8];

struct HFSPlusForkData {
  uint64_t logicalSize;
  uint32_t clumpSize;
  uint32_t totalBlocks;
  HFSPlusExtentRecord extents;
} __attribute__((__packed__));
typedef struct HFSPlusForkData HFSPlusForkData;
 
struct HFSPlusVolumeHeader {
  uint16_t signature;
  uint16_t version;
  uint32_t attributes;
  uint32_t lastMountedVersion;
  uint32_t journalInfoBlock;
 
  uint32_t createDate;
  uint32_t modifyDate;
  uint32_t backupDate;
  uint32_t checkedDate;
 
  uint32_t fileCount;
  uint32_t folderCount;
 
  uint32_t blockSize;
  uint32_t totalBlocks;
  uint32_t freeBlocks;
 
  uint32_t nextAllocation;
  uint32_t rsrcClumpSize;
  uint32_t dataClumpSize;
  HFSCatalogNodeID nextCatalogID;
 
  uint32_t writeCount;
  uint64_t encodingsBitmap;
 
  uint32_t finderInfo[8];
 
  HFSPlusForkData allocationFile;
  HFSPlusForkData extentsFile;
  HFSPlusForkData catalogFile;
  HFSPlusForkData attributesFile;
  HFSPlusForkData startupFile;
} __attribute__((__packed__));
typedef struct HFSPlusVolumeHeader HFSPlusVolumeHeader;

enum {
    kBTLeafNode       = -1,
    kBTIndexNode      =  0,
    kBTHeaderNode     =  1,
    kBTMapNode        =  2
};

struct BTNodeDescriptor {
    uint32_t    fLink;
    uint32_t    bLink;
    int8_t     kind;
    uint8_t     height;
    uint16_t    numRecords;
    uint16_t    reserved;
} __attribute__((__packed__));
typedef struct BTNodeDescriptor BTNodeDescriptor;

#define kHFSCaseFolding 0xCF
#define kHFSBinaryCompare 0xBC

struct BTHeaderRec {
    uint16_t    treeDepth;
    uint32_t    rootNode;
    uint32_t    leafRecords;
    uint32_t    firstLeafNode;
    uint32_t    lastLeafNode;
    uint16_t    nodeSize;
    uint16_t    maxKeyLength;
    uint32_t    totalNodes;
    uint32_t    freeNodes;
    uint16_t    reserved1;
    uint32_t    clumpSize;      // misaligned
    uint8_t     btreeType;
    uint8_t     keyCompareType;
    uint32_t    attributes;     // long aligned again
    uint32_t    reserved3[16];
} __attribute__((__packed__));
typedef struct BTHeaderRec BTHeaderRec;

struct HFSPlusExtentKey {
    uint16_t              keyLength;
    uint8_t               forkType;
    uint8_t               pad;
    HFSCatalogNodeID    fileID;
    uint32_t              startBlock;
} __attribute__((__packed__));
typedef struct HFSPlusExtentKey HFSPlusExtentKey;

struct HFSPlusCatalogKey {
    uint16_t              keyLength;
    HFSCatalogNodeID    parentID;
    HFSUniStr255        nodeName;
} __attribute__((__packed__));
typedef struct HFSPlusCatalogKey HFSPlusCatalogKey;

struct Point {
  int16_t              v;
  int16_t              h;
} __attribute__((__packed__));
typedef struct Point  Point;

struct Rect {
  int16_t              top;
  int16_t              left;
  int16_t              bottom;
  int16_t              right;
} __attribute__((__packed__));
typedef struct Rect   Rect;

/* OSType is a 32-bit value made by packing four 1-byte characters 
   together. */
typedef uint32_t        FourCharCode;
typedef FourCharCode  OSType;

/* Finder flags (finderFlags, fdFlags and frFlags) */
enum {
  kIsOnDesk       = 0x0001,     /* Files and folders (System 6) */
  kColor          = 0x000E,     /* Files and folders */
  kIsShared       = 0x0040,     /* Files only (Applications only) If */
                                /* clear, the application needs */
                                /* to write to its resource fork, */
                                /* and therefore cannot be shared */
                                /* on a server */
  kHasNoINITs     = 0x0080,     /* Files only (Extensions/Control */
                                /* Panels only) */
                                /* This file contains no INIT resource */
  kHasBeenInited  = 0x0100,     /* Files only.  Clear if the file */
                                /* contains desktop database resources */
                                /* ('BNDL', 'FREF', 'open', 'kind'...) */
                                /* that have not been added yet.  Set */
                                /* only by the Finder. */
                                /* Reserved for folders */
  kHasCustomIcon  = 0x0400,     /* Files and folders */
  kIsStationery   = 0x0800,     /* Files only */
  kNameLocked     = 0x1000,     /* Files and folders */
  kHasBundle      = 0x2000,     /* Files only */
  kIsInvisible    = 0x4000,     /* Files and folders */
  kIsAlias        = 0x8000      /* Files only */
};

/* Extended flags (extendedFinderFlags, fdXFlags and frXFlags) */
enum {
  kExtendedFlagsAreInvalid    = 0x8000, /* The other extended flags */
                                        /* should be ignored */
  kExtendedFlagHasCustomBadge = 0x0100, /* The file or folder has a */
                                        /* badge resource */
  kExtendedFlagHasRoutingInfo = 0x0004  /* The file contains routing */
                                        /* info resource */
};

enum {
    kSymLinkFileType  = 0x736C6E6B, /* 'slnk' */
    kSymLinkCreator   = 0x72686170  /* 'rhap' */
};

struct FileInfo {
  OSType    fileType;           /* The type of the file */
  OSType    fileCreator;        /* The file's creator */
  uint16_t    finderFlags;
  Point     location;           /* File's location in the folder. */
  uint16_t    reservedField;
} __attribute__((__packed__));
typedef struct FileInfo   FileInfo;

struct ExtendedFileInfo {
  int16_t    reserved1[4];
  uint16_t    extendedFinderFlags;
  int16_t    reserved2;
  int32_t    putAwayFolderID;
} __attribute__((__packed__));
typedef struct ExtendedFileInfo   ExtendedFileInfo;

struct FolderInfo {
  Rect      windowBounds;       /* The position and dimension of the */
                                /* folder's window */
  uint16_t    finderFlags;
  Point     location;           /* Folder's location in the parent */
                                /* folder. If set to {0, 0}, the Finder */
                                /* will place the item automatically */
  uint16_t    reservedField;
} __attribute__((__packed__));
typedef struct FolderInfo   FolderInfo;

struct ExtendedFolderInfo {
  Point     scrollPosition;     /* Scroll position (for icon views) */
  int32_t    reserved1;
  uint16_t    extendedFinderFlags;
  int16_t    reserved2;
  int32_t    putAwayFolderID;
} __attribute__((__packed__));
typedef struct ExtendedFolderInfo   ExtendedFolderInfo;

#define S_ISUID 0004000     /* set user id on execution */
#define S_ISGID 0002000     /* set group id on execution */
#define S_ISTXT 0001000     /* sticky bit */

#define S_IRWXU 0000700     /* RWX mask for owner */
#define S_IRUSR 0000400     /* R for owner */
#define S_IWUSR 0000200     /* W for owner */
#define S_IXUSR 0000100     /* X for owner */

#define S_IRWXG 0000070     /* RWX mask for group */
#define S_IRGRP 0000040     /* R for group */
#define S_IWGRP 0000020     /* W for group */
#define S_IXGRP 0000010     /* X for group */

#define S_IRWXO 0000007     /* RWX mask for other */
#define S_IROTH 0000004     /* R for other */
#define S_IWOTH 0000002     /* W for other */
#define S_IXOTH 0000001     /* X for other */

#define S_IFMT   0170000    /* type of file mask */
#define S_IFIFO  0010000    /* named pipe (fifo) */
#define S_IFCHR  0020000    /* character special */
#define S_IFDIR  0040000    /* directory */
#define S_IFBLK  0060000    /* block special */
#define S_IFREG  0100000    /* regular */
#define S_IFLNK  0120000    /* symbolic link */
#define S_IFSOCK 0140000    /* socket */
#define S_IFWHT  0160000    /* whiteout */

struct HFSPlusBSDInfo {
    uint32_t  ownerID;
    uint32_t  groupID;
    uint8_t   adminFlags;
    uint8_t   ownerFlags;
    uint16_t  fileMode;
    union {
        uint32_t  iNodeNum;
        uint32_t  linkCount;
        uint32_t  rawDevice;
    } special;
} __attribute__((__packed__));
typedef struct HFSPlusBSDInfo HFSPlusBSDInfo;

enum {
    kHFSPlusFolderRecord        = 0x0001,
    kHFSPlusFileRecord          = 0x0002,
    kHFSPlusFolderThreadRecord  = 0x0003,
    kHFSPlusFileThreadRecord    = 0x0004
};

enum {
	kHFSFileLockedBit       = 0x0000,       /* file is locked and cannot be written to */
	kHFSFileLockedMask      = 0x0001,
	
	kHFSThreadExistsBit     = 0x0001,       /* a file thread record exists for this file */
	kHFSThreadExistsMask    = 0x0002,
	
	kHFSHasAttributesBit    = 0x0002,       /* object has extended attributes */
	kHFSHasAttributesMask   = 0x0004,
	
	kHFSHasSecurityBit      = 0x0003,       /* object has security data (ACLs) */
	kHFSHasSecurityMask     = 0x0008,
	
	kHFSHasFolderCountBit   = 0x0004,       /* only for HFSX, folder maintains a separate sub-folder count */
	kHFSHasFolderCountMask  = 0x0010,       /* (sum of folder records and directory hard links) */
	
	kHFSHasLinkChainBit     = 0x0005,       /* has hardlink chain (inode or link) */
	kHFSHasLinkChainMask    = 0x0020,
	
	kHFSHasChildLinkBit     = 0x0006,       /* folder has a child that's a dir link */
	kHFSHasChildLinkMask    = 0x0040
};

struct HFSPlusCatalogFolder {
    int16_t              recordType;
    uint16_t              flags;
    uint32_t              valence;
    HFSCatalogNodeID    folderID;
    uint32_t              createDate;
    uint32_t              contentModDate;
    uint32_t              attributeModDate;
    uint32_t              accessDate;
    uint32_t              backupDate;
    HFSPlusBSDInfo      permissions;
    FolderInfo          userInfo;
    ExtendedFolderInfo  finderInfo;
    uint32_t              textEncoding;
    uint32_t              folderCount;
} __attribute__((__packed__));
typedef struct HFSPlusCatalogFolder HFSPlusCatalogFolder;

struct HFSPlusCatalogFile {
    int16_t              recordType;
    uint16_t              flags;
    uint32_t              reserved1;
    HFSCatalogNodeID    fileID;
    uint32_t              createDate;
    uint32_t              contentModDate;
    uint32_t              attributeModDate;
    uint32_t              accessDate;
    uint32_t              backupDate;
    HFSPlusBSDInfo      permissions;
    FileInfo            userInfo;
    ExtendedFileInfo    finderInfo;
    uint32_t              textEncoding;
    uint32_t              reserved2;
 
    HFSPlusForkData     dataFork;
    HFSPlusForkData     resourceFork;
} __attribute__((__packed__));
typedef struct HFSPlusCatalogFile HFSPlusCatalogFile;

struct HFSPlusCatalogThread {
    int16_t              recordType;
    int16_t              reserved;
    HFSCatalogNodeID    parentID;
    HFSUniStr255        nodeName;
} __attribute__((__packed__));
typedef struct HFSPlusCatalogThread HFSPlusCatalogThread;

struct HFSPlusCatalogRecord {
  int16_t recordType;
  unsigned char data[0];
} __attribute__((__packed__));
typedef struct HFSPlusCatalogRecord HFSPlusCatalogRecord;

struct CatalogRecordList {
  HFSUniStr255 name;
  HFSPlusCatalogRecord* record;
  struct CatalogRecordList* next;
};
typedef struct CatalogRecordList CatalogRecordList;

struct Extent {
  uint32_t startBlock;
  uint32_t blockCount;
  struct Extent* next;
};

typedef struct Extent Extent;

typedef struct {
  io_func* io;
  BTHeaderRec *headerRec;
  compareFunc compare;
  dataReadFunc keyRead;
  keyWriteFunc keyWrite;
  keyPrintFunc keyPrint;
  dataReadFunc dataRead;
} BTree;

typedef struct {
  io_func* image;
  HFSPlusVolumeHeader* volumeHeader;

  BTree* extentsTree;
  BTree* catalogTree;
  io_func* allocationFile;
} Volume;


typedef struct {
  HFSCatalogNodeID id;
  HFSPlusCatalogRecord* catalogRecord;
  Volume* volume;
  HFSPlusForkData* forkData;
  Extent* extents;
} RawFile;

#ifdef __cplusplus
extern "C" {
#endif
	void panic(const char* panicString);

	void printUnicode(HFSUniStr255* str);
	char* unicodeToAscii(HFSUniStr255* str);

	BTNodeDescriptor* readBTNodeDescriptor(uint32_t num, BTree* tree);

	BTHeaderRec* readBTHeaderRec(io_func* io);

	BTree* openBTree(io_func* io, compareFunc compare, dataReadFunc keyRead, keyWriteFunc keyWrite, keyPrintFunc keyPrint, dataReadFunc dataRead);

	void closeBTree(BTree* tree);

	off_t getRecordOffset(int num, uint32_t nodeNum, BTree* tree);

	off_t getNodeNumberFromPointerRecord(off_t offset, io_func* io);

	void* search(BTree* tree, BTKey* searchKey, int *exact, uint32_t *nodeNumber, int *recordNumber);

	io_func* openFlatFile(const char* fileName);
	io_func* openFlatFileRO(const char* fileName);

	io_func* openRawFile(HFSCatalogNodeID id, HFSPlusForkData* forkData, HFSPlusCatalogRecord* catalogRecord, Volume* volume);

	void flipExtentRecord(HFSPlusExtentRecord* extentRecord);

	BTree* openExtentsTree(io_func* file);

	void ASCIIToUnicode(const char* ascii, HFSUniStr255* unistr);

	void flipCatalogFolder(HFSPlusCatalogFolder* record);
	void flipCatalogFile(HFSPlusCatalogFile* record);
	void flipCatalogThread(HFSPlusCatalogThread* record, int out);

	BTree* openCatalogTree(io_func* file);
	int updateCatalog(Volume* volume, HFSPlusCatalogRecord* catalogRecord);
	int move(const char* source, const char* dest, Volume* volume);
	int removeFile(const char* fileName, Volume* volume);
	HFSCatalogNodeID newFolder(const char* pathName, Volume* volume);
	HFSCatalogNodeID newFile(const char* pathName, Volume* volume);
	int chmodFile(const char* pathName, int mode, Volume* volume);
	int chownFile(const char* pathName, uint32_t owner, uint32_t group, Volume* volume);
	int makeSymlink(const char* pathName, const char* target, Volume* volume);

	HFSPlusCatalogRecord* getRecordByCNID(HFSCatalogNodeID CNID, Volume* volume);
	HFSPlusCatalogRecord* getLinkTarget(HFSPlusCatalogRecord* record, HFSCatalogNodeID parentID, HFSPlusCatalogKey *key, Volume* volume);
	CatalogRecordList* getFolderContents(HFSCatalogNodeID CNID, Volume* volume);
	HFSPlusCatalogRecord* getRecordFromPath(const char* path, Volume* volume, char **name, HFSPlusCatalogKey* retKey);
	HFSPlusCatalogRecord* getRecordFromPath2(const char* path, Volume* volume, char **name, HFSPlusCatalogKey* retKey, char traverse);
	HFSPlusCatalogRecord* getRecordFromPath3(const char* path, Volume* volume, char **name, HFSPlusCatalogKey* retKey, char traverse, char returnLink, HFSCatalogNodeID parentID);
	void releaseCatalogRecordList(CatalogRecordList* list);

	int isBlockUsed(Volume* volume, uint32_t block);
	int setBlockUsed(Volume* volume, uint32_t block, int used);
	int allocate(RawFile* rawFile, off_t size);

	void flipForkData(HFSPlusForkData* forkData);

	Volume* openVolume(io_func* io);
	void closeVolume(Volume *volume);
	int updateVolume(Volume* volume);

	int debugBTree(BTree* tree, int displayTree);

	int addToBTree(BTree* tree, BTKey* searchKey, size_t length, unsigned char* content);

	int removeFromBTree(BTree* tree, BTKey* searchKey);

	int32_t FastUnicodeCompare ( register uint16_t str1[], register uint16_t length1,
		                    register uint16_t str2[], register uint16_t length2);
#ifdef __cplusplus
}
#endif

#endif