oer support code

skeletons/Makefile.am

@@ -33,6 +33,7 @@ libasn1cskeletons_la_SOURCES = 				\
 	GraphicString.c GraphicString.h			\
 	IA5String.c IA5String.h				\
 	INTEGER.c INTEGER.h				\
+	INTEGER_oer.c INTEGER_oer.h			\
 	ISO646String.c ISO646String.h			\
 	NULL.c NULL.h					\
 	NativeEnumerated.c NativeEnumerated.h		\
@@ -68,6 +69,9 @@ libasn1cskeletons_la_SOURCES = 				\
 	constr_TYPE.c constr_TYPE.h			\
 	constraints.c constraints.h			\
 	der_encoder.c der_encoder.h			\
+	oer_decoder.c oer_decoder.h			\
+	oer_encoder.c oer_encoder.h			\
+	oer_support.c oer_support.h			\
 	per_decoder.c per_decoder.h			\
 	per_encoder.c per_encoder.h			\
 	per_opentype.c per_opentype.h			\

skeletons/oer_decoder.c

+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_internal.h>
+
+/*
+ * The OER decoder of any type.
+ */
+asn_dec_rval_t
+oer_decode(asn_codec_ctx_t *opt_codec_ctx,
+	asn_TYPE_descriptor_t *type_descriptor,
+	void **struct_ptr, const void *ptr, size_t size) {
+	asn_codec_ctx_t s_codec_ctx;
+
+	/*
+	 * Stack checker requires that the codec context
+	 * must be allocated on the stack.
+	 */
+	if(opt_codec_ctx) {
+		if(opt_codec_ctx->max_stack_size) {
+			s_codec_ctx = *opt_codec_ctx;
+			opt_codec_ctx = &s_codec_ctx;
+		}
+	} else {
+		/* If context is not given, be security-conscious anyway */
+		memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
+		s_codec_ctx.max_stack_size = ASN__DEFAULT_STACK_MAX;
+		opt_codec_ctx = &s_codec_ctx;
+	}
+
+	/*
+	 * Invoke type-specific decoder.
+	 */
+	return type_descriptor->oer_decoder(opt_codec_ctx, type_descriptor, 0,
+		struct_ptr,	/* Pointer to the destination structure */
+		ptr, size	/* Buffer and its size */
+		);
+}

skeletons/oer_decoder.h

@@ -6,6 +6,7 @@
 #define	_OER_DECODER_H_
 
 #include <asn_application.h>
+#include <oer_support.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -28,11 +29,13 @@ asn_dec_rval_t oer_decode(struct asn_codec_ctx_s *opt_codec_ctx,
 /*
  * Type of generic function which decodes the byte stream into the structure.
  */
-typedef asn_dec_rval_t (oer_type_decoder_f)(
-		struct asn_codec_ctx_s *opt_codec_ctx,
-		struct asn_TYPE_descriptor_s *type_descriptor,
-		void **struct_ptr, const void *buf_ptr, size_t size,
-		int tag_mode);
+typedef asn_dec_rval_t(oer_type_decoder_f)(
+    struct asn_codec_ctx_s *opt_codec_ctx,
+    struct asn_TYPE_descriptor_s *type_descriptor,
+    asn_oer_constraint_t *constraints,
+    void **struct_ptr,
+    const void *buf_ptr,
+    size_t size);
 
 #ifdef __cplusplus
 }

skeletons/oer_support.h

+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are oermitted subject to BSD license.
+ */
+#ifndef	_OER_SUPPORT_H_
+#define	_OER_SUPPORT_H_
+
+#include <asn_system.h>		/* Platform-specific types */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Pre-computed OER constraints.
+ */
+typedef const struct asn_oer_constraint_s {
+	enum asn_oer_constraint_flags {
+		AOC_HAS_LOWER_BOUND = 0x01,
+		AOC_HAS_UPPER_BOUND = 0x02
+	} flags;
+	intmax_t lower_bound;
+	intmax_t upoer_bound;
+} asn_oer_constraint_t;
+typedef const struct asn_oer_constraints_s {
+    struct asn_oer_constraint_s value;
+    struct asn_oer_constraint_s size;
+} asn_oer_constraints_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _OER_SUPPORT_H_ */