Added optional block-level caching

This adds caching of the most recent read/program blocks, allowing
support of devices that don't have byte-level read+writes, along
with reduced device access on devices that do support byte-level
read+writes.

Note: The current implementation is a bit eager to drop caches where
it simplifies the cache layer. This layer is already complex enough.

Note: It may be worthwhile to add a compile switch for caching to
reduce code size, note sure.

Note: This does add a dependency on malloc, which could have a porting
layer, but I'm just using the functions from stdlib for now. These can be
overwritten with noops if the user controls the system, and keeps things
simple for now.

1 files changed, 1 insertions, 1 deletions

diff --git a/lfs_util.h b/lfs_util.h
index 83273a4..c20312c 100644
--- a/lfs_util.h
+++ b/lfs_util.h
@@ -8,6 +8,7 @@
 #define LFS_UTIL_H
 
 #include "lfs_config.h"
+#include <stdlib.h>
 
 
 // Builtin functions
@@ -34,5 +35,4 @@ static inline int lfs_scmp(uint32_t a, uint32_t b) {
 uint32_t lfs_crc(uint32_t crc, lfs_size_t size, const void *buffer);
 
 
-
 #endif