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+---
+Author: Gábor Szalai
+Version: 1551-CNL 113 851, Rev. A
+Date: 2017-04-10
+
+---
+= HTTP2 Protocol Modules for TTCN-3 Toolset with Titan, Description
+:author: Gábor Szalai
+:revnumber: 1551-CNL 113 851, Rev. A
+:revdate: 2017-04-10
+:toc:
+
+= Functionality
+
+The HTTP2 protocol module implements the message structures of the related protocol <<_4, [4]>> in a formalized way, using the standard specification language TTCN-3. This allows defining of test data (templates) in the TTCN-3 language and correctly encoding/decoding messages when executing test suites using the Titan TTCN-3 test environment.
+
+== Implemented Protocols
+
+This set of protocol modules implements protocol messages and constants of the HTTP2 protocol as described in https://tools.ietf.org/html/rfc7540[RFC7540].
+
+Header compression is implemented as described in https://tools.ietf.org/html/rfc7541[RFC7541].
+
+=== Modified and Non-Implemented Protocol Elements
+
+None.
+
+=== Ericsson-Specific Changes
+
+None.
+
+== Backward Incompatibilities
+
+None
+
+== System Requirements
+
+Protocol modules are a set of TTCN-3 source code files that can be used as part of TTCN-3 test suites only. Hence, protocol modules alone do not put specific requirements on the system used. However, in order to compile and execute a TTCN-3 test suite using the set of protocol modules the following system requirements must be satisfied:
+
+* Titan TTCN-3 Test Executor version CRL 113 200/5 R4A (5.3.pl0) or higher installed. For Installation Guide see <<_2, [2]>>.
+
+NOTE: This version of the test port is not compatible with Titan releases earlier than CRL 113 200/5 R4A.
+
+= Usage
+
+== Installation
+
+The set of protocol modules can be used in developing TTCN-3 test suites using any text editor; however, to make the work more efficient a TTCN3enabled text editor is recommended (for example `nedit`, `xemacs`). Since the HTTP2 protocol is used as a part of a TTCN-3 test suite, this requires TTCN-3 Test Executor be installed before the module can be compiled and executed together with other parts of the test suite. For more details on the installation of TTCN-3 Test Executor see the relevant section of <<_2, [2]>>.
+
+== Configuration
+
+None.
+
+== Examples
+
+None.
+
+= Interface Description
+
+== HTTP2 Frame Handling
+
+The HTTP2 frame is represented by the `HTTP2_Frame` union.
+
+=== HTTP2 Frame Encoding Functions
+
+[source]
+f_HTTP2_encode_frame(in HTTP2_Frame pl_frame) return octetstring
+
+Used to encode the `HTTP2_Frame`. Returns the encoded frame in octetstring.
+
+[source]
+----
+f_HTTP2_decode_frame( in octetstring pl_stream, out HTTP2_Frame pl_frame, out HTTP2_decoder_error_descr pl_error_descr) return integer
+----
+
+Used to decode the received HTTP2 frame. If the decoder function detects errors detectable only during decoding, the description of the error is returned via `pl_error_descr`.
+
+Return value:
+
+* `_1_` – Decoding failed.
+* `_0_` – Decoding OK
+
+== Header Compression
+
+The protocol module provides functions and framework for header compression.
+
+A header compression context is represented by the `HTTP2_comp_context` record. Separate context should be maintained for sending and receiving.
+
+How to use the header compression:
+
+1. Create the context with function:
++
+[source]
+----
+HTTP2_comp_context_init(in integer h_table_size_local:=4096, in integer h_table_size_remote:=4096 ) return HTTP2_comp_context
+----
+
+2. Encode/Decode every header block with the functions in the exactly the same order as the header blocks are sent or received in order to maintain the header compression context:
++
+[source]
+----
+HTTP2_comp_context_encode(inout HTTP2_comp_context pl_context, in HTTP2_header_block pl_hblock, out octetstring pl_frame_data) return integer
+
+HTTP2_comp_context_decode(inout HTTP2_comp_context pl_context, out HTTP2_header_block pl_hblock, in octetstring pl_frame_data) return integer
+----
+
+3. Delete the context with
++
+[source]
+HTTP2_comp_context_free(inout HTTP2_comp_context pl_context)
++
+WARNING: Non-freed context leads to memory leak!!!!
+
+= Terminology
+
+None.
+
+= Abbreviations
+
+TTCN-3:: Testing and Test Control Notation version 3
+
+= References
+
+[[_1]]
+[1] ETSI ES 201 873-1 v4.4.1 (2012-04) +
+The Testing and Test Control Notation version 3. Part 1: Core Language
+
+[[_2]]
+[2] User Guide for TITAN TTCN-3 Test Executor
+
+[[_3]]
+[3] Programmer’s Technical Reference for Titan TTCN–3 Test Executor
+
+[[_4]]
+[4] https://tools.ietf.org/html/rfc7540[RFC 7540] +
+Hypertext Transfer Protocol Version 2 (HTTP/2)
+
+[[_5]]
+[5] https://tools.ietf.org/html/rfc7541[RFC 7541] +
+HPACK: Header Compression for HTTP/2
+
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