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-rw-r--r--linux/include/linux/xz.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/linux/include/linux/xz.h b/linux/include/linux/xz.h
index 810cb10a6357..0a4b38d33c2c 100644
--- a/linux/include/linux/xz.h
+++ b/linux/include/linux/xz.h
@@ -251,6 +251,22 @@ XZ_EXTERN void xz_dec_end(struct xz_dec *s);
# endif
#endif
+/*
+ * If CRC64 support has been enabled with XZ_USE_CRC64, a CRC64
+ * implementation is needed too.
+ */
+#ifndef XZ_USE_CRC64
+# undef XZ_INTERNAL_CRC64
+# define XZ_INTERNAL_CRC64 0
+#endif
+#ifndef XZ_INTERNAL_CRC64
+# ifdef __KERNEL__
+# error Using CRC64 in the kernel has not been implemented.
+# else
+# define XZ_INTERNAL_CRC64 1
+# endif
+#endif
+
#if XZ_INTERNAL_CRC32
/*
* This must be called before any other xz_* function to initialize
@@ -266,6 +282,21 @@ XZ_EXTERN void xz_crc32_init(void);
XZ_EXTERN uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc);
#endif
+#if XZ_INTERNAL_CRC64
+/*
+ * This must be called before any other xz_* function (except xz_crc32_init())
+ * to initialize the CRC64 lookup table.
+ */
+XZ_EXTERN void xz_crc64_init(void);
+
+/*
+ * Update CRC64 value using the polynomial from ECMA-182. To start a new
+ * calculation, the third argument must be zero. To continue the calculation,
+ * the previously returned value is passed as the third argument.
+ */
+XZ_EXTERN uint64_t xz_crc64(const uint8_t *buf, size_t size, uint64_t crc);
+#endif
+
#ifdef __cplusplus
}
#endif