Add lz4hc image compression format
Smaller than lz4 and decompresses at the same speed. Compression is
a bit slower.
Example saves on old FB APK:
Uncompressed: 44748800 bytes
LZ4: 12443648 bytes
LZ4HC: 11055104 bytes
Generating the image slows down by ~1s per 20MB of image due to
slower compression. Decompression is about the same speed but there
should be a slight speedup since less data needs to be read from
flash.
Added test.
Bug: 22858531
Change-Id: Ib2704305b9bec5b0ba3b1e871f59f4eedff330b7
diff --git a/runtime/image.h b/runtime/image.h
index 146ee00..8e5dbad 100644
--- a/runtime/image.h
+++ b/runtime/image.h
@@ -81,6 +81,7 @@
enum StorageMode : uint32_t {
kStorageModeUncompressed,
kStorageModeLZ4,
+ kStorageModeLZ4HC,
kStorageModeCount, // Number of elements in enum.
};
static constexpr StorageMode kDefaultStorageMode = kStorageModeUncompressed;