lib/xz/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config XZ_DEC
   3         tristate "XZ decompression support"
   4         select CRC32
   5         help
   6           LZMA2 compression algorithm and BCJ filters are supported using
   7           the .xz file format as the container. For integrity checking,
   8           CRC32 is supported. See Documentation/staging/xz.rst for more information.
   9
  10 if XZ_DEC
  11
  12 config XZ_DEC_X86
  13         bool "x86 BCJ filter decoder" if EXPERT
  14         default y
  15         select XZ_DEC_BCJ
  16
  17 config XZ_DEC_POWERPC
  18         bool "PowerPC BCJ filter decoder" if EXPERT
  19         default y
  20         select XZ_DEC_BCJ
  21
  22 config XZ_DEC_IA64
  23         bool "IA-64 BCJ filter decoder" if EXPERT
  24         default y
  25         select XZ_DEC_BCJ
  26
  27 config XZ_DEC_ARM
  28         bool "ARM BCJ filter decoder" if EXPERT
  29         default y
  30         select XZ_DEC_BCJ
  31
  32 config XZ_DEC_ARMTHUMB
  33         bool "ARM-Thumb BCJ filter decoder" if EXPERT
  34         default y
  35         select XZ_DEC_BCJ
  36
  37 config XZ_DEC_SPARC
  38         bool "SPARC BCJ filter decoder" if EXPERT
  39         default y
  40         select XZ_DEC_BCJ
  41
  42 config XZ_DEC_MICROLZMA
  43         bool "MicroLZMA decoder"
  44         default n
  45         help
  46           MicroLZMA is a header format variant where the first byte
  47           of a raw LZMA stream (without the end of stream marker) has
  48           been replaced with a bitwise-negation of the lc/lp/pb
  49           properties byte. MicroLZMA was created to be used in EROFS
  50           but can be used by other things too where wasting minimal
  51           amount of space for headers is important.
  52
  53           Unless you know that you need this, say N.
  54
  55 endif
  56
  57 config XZ_DEC_BCJ
  58         bool
  59         default n
  60
  61 config XZ_DEC_TEST
  62         tristate "XZ decompressor tester"
  63         default n
  64         depends on XZ_DEC
  65         help
  66           This allows passing .xz files to the in-kernel XZ decoder via
  67           a character special file. It calculates CRC32 of the decompressed
  68           data and writes diagnostics to the system log.
  69
  70           Unless you are developing the XZ decoder, you don't need this
  71           and should say N.