Initial commit of files

src/libasn1/oer_get_bits.c

@@ -0,0 +1,71 @@
+/*****************************************************************************
+ * Copyright (C) 2004-2021
+ * ProbeStar Technical Systems, LLC
+ * All Rights Reserved.  Proprietary and Confidential.
+ *============================================================================
+*****************************************************************************/
+
+/*****************************************************************************
+ * includes
+*****************************************************************************/
+
+#include "embtypes.h"
+#include "asn1oer.h"
+
+/*****************************************************************************
+ * defines
+*****************************************************************************/
+
+/*****************************************************************************
+ * macros
+*****************************************************************************/
+
+#define min(A,B)        ((A)<(B)?(A):(B))
+#define max(A,B)        ((A)>(B)?(A):(B))
+
+/*****************************************************************************
+ * structs & typedefs
+*****************************************************************************/
+
+/*****************************************************************************
+ * global constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * global variables
+*****************************************************************************/
+
+/*****************************************************************************
+ * static constants
+*****************************************************************************/
+
+/*****************************************************************************
+ * static variables
+*****************************************************************************/
+
+/*****************************************************************************
+ * static prototypes
+*****************************************************************************/
+
+/*****************************************************************************
+ * C functions
+*****************************************************************************/
+
+uint64_t oer_get_bitstream(OER_Stream *oer, OER_BitStream *bs, uint max)
+{
+  if (!oer || !bs || !max)
+    return 0;
+  
+  bs->value = oer_get_value(oer, max);
+  bs->max = max;
+  return max;
+}
+
+// from the front (high->low bits)
+uint64_t oer_get_bit_bstream(OER_BitStream *bs, uint bit)
+{
+  if (!bs || (bit>=bs->max))
+    return 0;
+  
+  return (bs->value & 1<<(bs->max-bit-1));
+}