diff --git a/library/common.h b/library/common.h
index 413bee2..fdb1193 100644
--- a/library/common.h
+++ b/library/common.h
@@ -90,8 +90,31 @@
 }
 #endif
 
+/*
+ * 32-bit integer manipulation macros (little endian)
+ */
+#ifndef GET_UINT32_LE
+#define GET_UINT32_LE(n,b,i)                            \
+{                                                       \
+    (n) = ( (uint32_t) (b)[(i)    ]       )             \
+        | ( (uint32_t) (b)[(i) + 1] <<  8 )             \
+        | ( (uint32_t) (b)[(i) + 2] << 16 )             \
+        | ( (uint32_t) (b)[(i) + 3] << 24 );            \
+}
+#endif
+
+#ifndef PUT_UINT32_LE
+#define PUT_UINT32_LE(n,b,i)                                    \
+{                                                               \
+    (b)[(i)    ] = (unsigned char) ( ( (n)       ) & 0xFF );    \
+    (b)[(i) + 1] = (unsigned char) ( ( (n) >>  8 ) & 0xFF );    \
+    (b)[(i) + 2] = (unsigned char) ( ( (n) >> 16 ) & 0xFF );    \
+    (b)[(i) + 3] = (unsigned char) ( ( (n) >> 24 ) & 0xFF );    \
+}
+#endif
+
 /** 
- * 
+ * 32-bit integer conversion from bytes (little endian)
  */
 #define BYTES_TO_U32_LE( data, offset )                         \
     ( (uint32_t) (data)[offset]                                 \