Add LZ4_FREESTANDING

2 files changed, 26 insertions, 1 deletions

diff --git a/lib/lz4.c b/lib/lz4.c
index 5fae002..ad12281 100644
--- a/lib/lz4.c
+++ b/lib/lz4.c
@@ -209,7 +209,9 @@ void  LZ4_free(void* p);
 # define FREEMEM(p)        free(p)
 #endif
 
-#include <string.h>   /* memset, memcpy */
+#if ! LZ4_FREESTANDING
+#  include <string.h>   /* memset, memcpy */
+#endif
 #if !defined(LZ4_memset)
 #  define LZ4_memset(p,v,s) memset((p),(v),(s))
 #endif
diff --git a/lib/lz4.h b/lib/lz4.h
index fee8890..01ab445 100644
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -97,6 +97,29 @@ extern "C" {
 #  define LZ4LIB_API LZ4LIB_VISIBILITY
 #endif
 
+/*!
+ * LZ4_FREESTANDING :
+ * Enable "freestanding mode" that is suitable for typical freestanding environment.
+ * In freestanding mode, some LZ4/HC functions which use heap are disabled.
+ */
+#if defined(LZ4_FREESTANDING) && (LZ4_FREESTANDING == 1)
+#  define LZ4_HEAPMODE 0
+#  define LZ4HC_HEAPMODE 0
+#  define LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION 1
+#  if !defined(LZ4_memcpy)
+#    error "LZ4_FREESTANDING requires macro 'LZ4_memcpy'."
+#  endif
+#  if !defined(LZ4_memset)
+#    error "LZ4_FREESTANDING requires macro 'LZ4_memset'."
+#  endif
+#  if !defined(LZ4_memmove)
+#    error "LZ4_FREESTANDING requires macro 'LZ4_memmove'."
+#  endif
+#elif ! defined(LZ4_FREESTANDING)
+#  define LZ4_FREESTANDING 0
+#endif
+
+
 /*------   Version   ------*/
 #define LZ4_VERSION_MAJOR    1    /* for breaking interface changes  */
 #define LZ4_VERSION_MINOR    9    /* for new (non-breaking) interface capabilities */