diff options
Diffstat (limited to 'src/liblzma/api/lzma/bcj.h')
| -rw-r--r-- | src/liblzma/api/lzma/bcj.h | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/liblzma/api/lzma/bcj.h b/src/liblzma/api/lzma/bcj.h index 8e37538a..ba6cacb9 100644 --- a/src/liblzma/api/lzma/bcj.h +++ b/src/liblzma/api/lzma/bcj.h @@ -49,9 +49,16 @@ * Filter for SPARC binaries. */ +#define LZMA_FILTER_ARM64 LZMA_VLI_C(0x3FDB87B33B27000B) + /**< + * Filter for ARM64 binaries. + * + * \note Unlike the older filters above, this doesn't + * support any options (must be NULL). + */ /** - * \brief Options for BCJ filters + * \brief Options for BCJ filters (except ARM64) * * The BCJ filters never change the size of the data. Specifying options * for them is optional: if pointer to options is NULL, default value is @@ -88,3 +95,29 @@ typedef struct { uint32_t start_offset; } lzma_options_bcj; + +/** + * \brief Options for the ARM64 filter + * + * This filter never changes the size of the data. + * Specifying options is mandatory. + */ +typedef struct { + /** + * \brief How wide range of relative addresses are converted + * + * The ARM64 BL instruction has 26-bit immediate field that encodes + * a relative address as a multiple of four bytes, so the effective + * range is 2^28 bytes (+/-128 MiB). + * + * If width is 28 bits (LZMA_ARM64_WIDTH_MAX), then all BL + * instructions will be converted. This has a downside of some + * false matches that make compression worse. The best value + * depends on the input file and the differences can be significant; + * with large executables the maximum value is sometimes the best. + */ + uint32_t width; +# define LZMA_ARM64_WIDTH_MIN 18 +# define LZMA_ARM64_WIDTH_MAX 28 +# define LZMA_ARM64_WIDTH_DEFAULT 26 +} lzma_options_arm64; |