1 /* 2 * Copyright 2022, Raghav Sharma, raghavself28@gmail.com 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef XFS_SYMLINK_H 6 #define XFS_SYMLINK_H 7 8 9 #include "Inode.h" 10 11 12 #define SYMLINK_MAGIC 0x58534c4d 13 14 15 // Used only on Version 5 16 struct SymlinkHeader { 17 public: 18 19 uint32 Magic() 20 { return B_BENDIAN_TO_HOST_INT32(sl_magic); } 21 22 uint64 Blockno() 23 { return B_BENDIAN_TO_HOST_INT64(sl_blkno); } 24 25 const uuid_t& Uuid() 26 { return sl_uuid; } 27 28 uint64 Owner() 29 { return B_BENDIAN_TO_HOST_INT64(sl_owner); } 30 31 static uint32 ExpectedMagic(int8 whichDirectory, Inode* inode) 32 { return SYMLINK_MAGIC; } 33 34 static uint32 CRCOffset() 35 { return offsetof(SymlinkHeader, sl_crc); } 36 37 private: 38 uint32 sl_magic; 39 uint32 sl_offset; 40 uint32 sl_bytes; 41 uint32 sl_crc; 42 uuid_t sl_uuid; 43 uint64 sl_owner; 44 uint64 sl_blkno; 45 uint64 sl_lsn; 46 }; 47 48 49 // This class will handle all formats of Symlinks in xfs 50 class Symlink { 51 public: 52 Symlink(Inode* inode); 53 ~Symlink(); 54 status_t ReadLink(off_t pos, char* buffer, size_t* _length); 55 private: 56 status_t _FillMapEntry(); 57 status_t _FillBuffer(); 58 status_t _ReadLocalLink(off_t pos, char* buffer, size_t* _length); 59 status_t _ReadExtentLink(off_t pos, char* buffer, size_t* _length); 60 61 Inode* fInode; 62 ExtentMapEntry fMap; 63 char* fSymlinkBuffer; 64 }; 65 66 #endif 67