1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config XZ_DEC 2 config XZ_DEC
3 tristate "XZ decompression support" 3 tristate "XZ decompression support"
4 select CRC32 4 select CRC32
5 help 5 help
6 LZMA2 compression algorithm and BCJ 6 LZMA2 compression algorithm and BCJ filters are supported using
7 the .xz file format as the container 7 the .xz file format as the container. For integrity checking,
8 CRC32 is supported. See Documentatio 8 CRC32 is supported. See Documentation/staging/xz.rst for more
9 information. 9 information.
10 10
11 if XZ_DEC 11 if XZ_DEC
12 12
13 config XZ_DEC_X86 13 config XZ_DEC_X86
14 bool "x86 BCJ filter decoder" if EXPER 14 bool "x86 BCJ filter decoder" if EXPERT
15 default y 15 default y
16 select XZ_DEC_BCJ 16 select XZ_DEC_BCJ
17 17
18 config XZ_DEC_POWERPC 18 config XZ_DEC_POWERPC
19 bool "PowerPC BCJ filter decoder" if E 19 bool "PowerPC BCJ filter decoder" if EXPERT
20 default y 20 default y
21 select XZ_DEC_BCJ 21 select XZ_DEC_BCJ
22 22
23 config XZ_DEC_ARM 23 config XZ_DEC_ARM
24 bool "ARM BCJ filter decoder" if EXPER 24 bool "ARM BCJ filter decoder" if EXPERT
25 default y 25 default y
26 select XZ_DEC_BCJ 26 select XZ_DEC_BCJ
27 27
28 config XZ_DEC_ARMTHUMB 28 config XZ_DEC_ARMTHUMB
29 bool "ARM-Thumb BCJ filter decoder" if 29 bool "ARM-Thumb BCJ filter decoder" if EXPERT
30 default y 30 default y
31 select XZ_DEC_BCJ 31 select XZ_DEC_BCJ
32 32
33 config XZ_DEC_ARM64 33 config XZ_DEC_ARM64
34 bool "ARM64 BCJ filter decoder" if EXP 34 bool "ARM64 BCJ filter decoder" if EXPERT
35 default y 35 default y
36 select XZ_DEC_BCJ 36 select XZ_DEC_BCJ
37 37
38 config XZ_DEC_SPARC 38 config XZ_DEC_SPARC
39 bool "SPARC BCJ filter decoder" if EXP 39 bool "SPARC BCJ filter decoder" if EXPERT
40 default y 40 default y
41 select XZ_DEC_BCJ 41 select XZ_DEC_BCJ
42 42
43 config XZ_DEC_RISCV 43 config XZ_DEC_RISCV
44 bool "RISC-V BCJ filter decoder" if EX 44 bool "RISC-V BCJ filter decoder" if EXPERT
45 default y 45 default y
46 select XZ_DEC_BCJ 46 select XZ_DEC_BCJ
47 47
48 config XZ_DEC_MICROLZMA 48 config XZ_DEC_MICROLZMA
49 bool "MicroLZMA decoder" 49 bool "MicroLZMA decoder"
50 default n 50 default n
51 help 51 help
52 MicroLZMA is a header format variant 52 MicroLZMA is a header format variant where the first byte
53 of a raw LZMA stream (without the en 53 of a raw LZMA stream (without the end of stream marker) has
54 been replaced with a bitwise-negatio 54 been replaced with a bitwise-negation of the lc/lp/pb
55 properties byte. MicroLZMA was creat 55 properties byte. MicroLZMA was created to be used in EROFS
56 but can be used by other things too 56 but can be used by other things too where wasting minimal
57 amount of space for headers is impor 57 amount of space for headers is important.
58 58
59 Unless you know that you need this, 59 Unless you know that you need this, say N.
60 60
61 endif 61 endif
62 62
63 config XZ_DEC_BCJ 63 config XZ_DEC_BCJ
64 bool 64 bool
65 default n 65 default n
66 66
67 config XZ_DEC_TEST 67 config XZ_DEC_TEST
68 tristate "XZ decompressor tester" 68 tristate "XZ decompressor tester"
69 default n 69 default n
70 depends on XZ_DEC 70 depends on XZ_DEC
71 help 71 help
72 This allows passing .xz files to the 72 This allows passing .xz files to the in-kernel XZ decoder via
73 a character special file. It calcula 73 a character special file. It calculates CRC32 of the decompressed
74 data and writes diagnostics to the s 74 data and writes diagnostics to the system log.
75 75
76 Unless you are developing the XZ dec 76 Unless you are developing the XZ decoder, you don't need this
77 and should say N. 77 and should say N.
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