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[stg.git] / libs / smux / include / stg / per_encoder.h

diff --git a/libs/smux/include/stg/per_encoder.h b/libs/smux/include/stg/per_encoder.h
index 9ac130b7373cc354effd24058027ea85ca3a9e59..95a6506e47b54695ad1eab616dbe02cded6f6338 100644 (file)
--- a/libs/smux/include/stg/per_encoder.h
+++ b/libs/smux/include/stg/per_encoder.h
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2006 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Copyright (c) 2006, 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
  * Redistribution and modifications are permitted subject to BSD license.
  */
 #ifndef        _PER_ENCODER_H_
@@ -16,6 +16,9 @@ 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(struct asn_TYPE_descriptor_s *type_descriptor,
        void *struct_ptr,       /* Structure to be encoded */
@@ -23,7 +26,11 @@ asn_enc_rval_t uper_encode(struct asn_TYPE_descriptor_s *type_descriptor,
        void *app_key           /* Arbitrary callback argument */
 );
 
-/* A variant of uper_encode() which encodes data into the existing buffer */
+/*
+ * 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(
        struct asn_TYPE_descriptor_s *type_descriptor,
        void *struct_ptr,       /* Structure to be encoded */
@@ -31,6 +38,19 @@ asn_enc_rval_t uper_encode_to_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(
+       struct asn_TYPE_descriptor_s *type_descriptor,
+       asn_per_constraints_t *constraints,
+       void *struct_ptr,       /* Structure to be encoded */
+       void **buffer_r         /* Buffer allocated and returned */
+);
 
 /*
  * Type of the generic PER encoder function.