UE4资源格式

UE4 PAK资源格式

Record

Offset  Size  Type         Description
     0     8  uint64_t     offset
     8     8  uint64_t     size (N)
    16     8  uint64_t     uncompressed size
    24     4  uint32_t     compression method:
                              0x00 ... none
                              0x01 ... zlib
                              0x10 ... bias memory
                              0x20 ... bias speed
if version <= 1
    28     8  uint64_t     timestamp
end
     ?    20  uint8_t[20]  data sha1 hash
if version >= 3
 if compression method != 0x00
  ?+20     4  uint32_t     block count (M)
  ?+24  M*16  CB[M]        compression blocks
 end
     ?     1  uint8_t      is encrypted
   ?+1     4  uint32_t     compression block size
end

Compression Block (CB)

Size: 16 bytes

Offset  Size  Type         Description
     0     8  uint64_t     start offset:
                           Absolute offset of the start of the compression block.
     8     8  uint64_t     end offset:
                           Absolute offset of the end of the compression block.
                           This may not align completely with the start of the
                           next block.

Data Record

Offset  Size  Type            Description
     0     ?  Record          file metadata (offset field is 0, N = compressed_size)
     ?     N  uint8_t[N]      file data

Index Record

Offset  Size  Type            Description
     0     4  uint32_t        file name size (S)
     4     S  char[S]         file name
   4+S     ?  Record          file metadata

Index

Offset  Size  Type            Description
     0     4  uint32_t        mount point size (S)
     4     S  char[S]         mount point
   S+4     4  uint32_t        record count (N)
   S+8     ?  IndexRecord[N]  records

Size: 44 bytes

Offset  Size  Type         Description
     0     4  uint32_t     magic: 0x5A6F12E1
     4     4  uint32_t     version: 1, 2, or 3
     8     8  uint64_t     index offset
    16     8  uint64_t     index size
    24    20  uint8_t[20]  index sha1 hash

posted on 2018-11-01 15:38  GeT1t  阅读(428)  评论(0编辑  收藏  举报

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