1config XZ_DEC 2 tristate "XZ decompression support" 3 select CRC32 4 help 5 LZMA2 compression algorithm and BCJ filters are supported using 6 the .xz file format as the container. For integrity checking, 7 CRC32 is supported. See Documentation/staging/xz.rst for more 8 information. 9 10if XZ_DEC 11 12config XZ_DEC_X86 13 bool "x86 BCJ filter decoder" if EXPERT 14 default y 15 select XZ_DEC_BCJ 16 17config XZ_DEC_POWERPC 18 bool "PowerPC BCJ filter decoder" if EXPERT 19 default y 20 select XZ_DEC_BCJ 21 22config XZ_DEC_IA64 23 bool "IA-64 BCJ filter decoder" if EXPERT 24 default y 25 select XZ_DEC_BCJ 26 27config XZ_DEC_ARM 28 bool "ARM BCJ filter decoder" if EXPERT 29 default y 30 select XZ_DEC_BCJ 31 32config XZ_DEC_ARMTHUMB 33 bool "ARM-Thumb BCJ filter decoder" if EXPERT 34 default y 35 select XZ_DEC_BCJ 36 37config XZ_DEC_ARM64 38 bool "ARM64 BCJ filter decoder" if EXPERT 39 default y 40 select XZ_DEC_BCJ 41 42config XZ_DEC_SPARC 43 bool "SPARC BCJ filter decoder" if EXPERT 44 default y 45 select XZ_DEC_BCJ 46 47config XZ_DEC_RISCV 48 bool "RISC-V BCJ filter decoder" if EXPERT 49 default y 50 select XZ_DEC_BCJ 51 52config XZ_DEC_MICROLZMA 53 bool "MicroLZMA decoder" 54 default n 55 help 56 MicroLZMA is a header format variant where the first byte 57 of a raw LZMA stream (without the end of stream marker) has 58 been replaced with a bitwise-negation of the lc/lp/pb 59 properties byte. MicroLZMA was created to be used in EROFS 60 but can be used by other things too where wasting minimal 61 amount of space for headers is important. 62 63 Unless you know that you need this, say N. 64 65endif 66 67config XZ_DEC_BCJ 68 bool 69 default n 70 71config XZ_DEC_TEST 72 tristate "XZ decompressor tester" 73 default n 74 depends on XZ_DEC 75 help 76 This allows passing .xz files to the in-kernel XZ decoder via 77 a character special file. It calculates CRC32 of the decompressed 78 data and writes diagnostics to the system log. 79 80 Unless you are developing the XZ decoder, you don't need this 81 and should say N. 82