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diff --git a/e2sim/e2apv1sim/e2sim/ASN1c/per_encoder.h b/e2sim/e2apv1sim/e2sim/ASN1c/per_encoder.h
new file mode 100644
index 0000000..b615ef0
--- /dev/null
+++ b/e2sim/e2apv1sim/e2sim/ASN1c/per_encoder.h
@@ -0,0 +1,93 @@
+/*-
+ * Copyright (c) 2006-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef	_PER_ENCODER_H_
+#define	_PER_ENCODER_H_
+
+#include <asn_application.h>
+#include <per_support.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct asn_TYPE_descriptor_s;	/* Forward declaration */
+
+/*
+ * Unaligned PER encoder of any ASN.1 type. May be invoked by the application.
+ * WARNING: This function returns the number of encoded bits in the .encoded
+ * field of the return value. Use the following formula to convert to bytes:
+ * 	bytes = ((.encoded + 7) / 8)
+ */
+asn_enc_rval_t uper_encode(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints,
+    const void *struct_ptr,                    /* Structure to be encoded */
+    asn_app_consume_bytes_f *consume_bytes_cb, /* Data collector */
+    void *app_key                              /* Arbitrary callback argument */
+);
+
+asn_enc_rval_t aper_encode(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints,
+    const void *struct_ptr,                     /* Structure to be encoded */
+    asn_app_consume_bytes_f *consume_bytes_cb,  /* Data collector */
+    void *app_key                               /* Arbitrary callback argument */
+);
+
+/*
+ * A variant of uper_encode() which encodes data into the existing buffer
+ * WARNING: This function returns the number of encoded bits in the .encoded
+ * field of the return value.
+ */
+asn_enc_rval_t uper_encode_to_buffer(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints,
+    const void *struct_ptr, /* Structure to be encoded */
+    void *buffer,           /* Pre-allocated buffer */
+    size_t buffer_size      /* Initial buffer size (max) */
+);
+
+asn_enc_rval_t aper_encode_to_buffer(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints,
+    const void *struct_ptr,  /* Structure to be encoded */
+    void *buffer,            /* Pre-allocated buffer */
+    size_t buffer_size       /* Initial buffer size (max) */
+);
+/*
+ * A variant of uper_encode_to_buffer() which allocates buffer itself.
+ * Returns the number of bytes in the buffer or -1 in case of failure.
+ * WARNING: This function produces a "Production of the complete encoding",
+ * with length of at least one octet. Contrast this to precise bit-packing
+ * encoding of uper_encode() and uper_encode_to_buffer().
+ */
+ssize_t uper_encode_to_new_buffer(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints,
+    const void *struct_ptr, /* Structure to be encoded */
+    void **buffer_r         /* Buffer allocated and returned */
+);
+
+ssize_t
+aper_encode_to_new_buffer(
+    const struct asn_TYPE_descriptor_s *td,
+    const asn_per_constraints_t *constraints,
+    const void *sptr,
+    void **buffer_r
+);
+
+/*
+ * Type of the generic PER encoder function.
+ */
+typedef asn_enc_rval_t(per_type_encoder_f)(
+    const struct asn_TYPE_descriptor_s *type_descriptor,
+    const asn_per_constraints_t *constraints, const void *struct_ptr,
+    asn_per_outp_t *per_output);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _PER_ENCODER_H_ */