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