1# SPDX-License-Identifier: GPL-2.0-only 2config 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 11if XZ_DEC 12 13config XZ_DEC_X86 14 bool "x86 BCJ filter decoder" if EXPERT 15 default y 16 select XZ_DEC_BCJ 17 18config XZ_DEC_POWERPC 19 bool "PowerPC BCJ filter decoder" if EXPERT 20 default y 21 select XZ_DEC_BCJ 22 23config XZ_DEC_ARM 24 bool "ARM BCJ filter decoder" if EXPERT 25 default y 26 select XZ_DEC_BCJ 27 28config XZ_DEC_ARMTHUMB 29 bool "ARM-Thumb BCJ filter decoder" if EXPERT 30 default y 31 select XZ_DEC_BCJ 32 33config XZ_DEC_ARM64 34 bool "ARM64 BCJ filter decoder" if EXPERT 35 default y 36 select XZ_DEC_BCJ 37 38config XZ_DEC_SPARC 39 bool "SPARC BCJ filter decoder" if EXPERT 40 default y 41 select XZ_DEC_BCJ 42 43config XZ_DEC_RISCV 44 bool "RISC-V BCJ filter decoder" if EXPERT 45 default y 46 select XZ_DEC_BCJ 47 48config 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 61endif 62 63config XZ_DEC_BCJ 64 bool 65 default n 66 67config 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. 78