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-rw-r--r--src/liblzma/api/lzma/bcj.h35
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;