Version 2.2.0

• Support for decoding OHMA messages. These are diagnostic data exchanged with
  Boeing 737MAX aircraft. Decoding requires libacars to be built with ZLIB
  support. The data is encoded in JSON which libacars might optionally
  pretty-print, when serializing the message as text. Pretty-printing feature
  requires Jansson library.
• Support for compilation with MSVC (thx John Beniston).

Version 2.1.4

• Fix compile error under MS Visual C++ caused by struct timeval
  being defined in winsock.h rather than sys/time.h (thx Jon Beniston)
• Fix compile error under GCC >= 10 (multiple definitions of asn_debug_indent)
• Fix for cmake >=3.17 not finding zlib1.dll when building with MinGW.

Version 2.1.3

• Fixed incorrect calculation of reporting interval in ADS-C Periodic
  Contract Requests. Reported by Roman Tordia.

Version 2.1.2

• Fixed a build failure when compiling without libxml2 support.

Version 2.1.1

• Media Advisory: fixed a bug where a message with 10 or more available link
  indicators could overflow the static buffer and produce garbled result (thx
  mmiszewski).
• Media Advisory: fixed a bug where a message with an exceptionally long text
  field could cause buffer overrun and crash the program (thx mmiszewski).
• Media Advisory: replaced message parsing routine with a simpler and more
  robust one.

Version 2.1.0

• ADS-C: fixed incorrect computation of vertical speed threshold in contract
  request messages.
• JSON: fixed a bug where an ASN.1 string containing a \0 character caused
  truncation of JSON output. NULLs in strings are now replaced with \u0000
  sequence.
• JSON: ASN.1 SEQUENCEs are now printed as JSON objects rather than arrays of
  objects. It produces a simpler and more readable JSON structure. The change
  applies to all ASN.1 types formatted with
  la_asn1_format_SEQUENCE_cpdlc_as_json function. Refer to
  asn1-format-cpdlc-json.c file for a full list.
• JSON: added json_append_octet_string_as_string function which prints the
  contents of the given byte buffer as a JSON string rather than as a list of
  numeric values.
• JSON: added a bunch of new functions for formatting basic ASN.1 types. Now we
  have them all in libacars. Before that they were scattered between libacars
  and dumpvdl2.
• JSON: deprecate la_json_append_long function. A more portable version named
  la_json_append_int64 shall be used instead.
• Small bugfixes, code cleanups.

Version 2.0.1

• Fixed a bug causing FANS1/A ErrorInformation message elements to be decoded incorrectly.

Version 2.0.0

• New major release 2. API and ABI are not backwards compatible with version 1,
  hence the new soname - libacars-2.so.2. Header files are now installed to
  /usr/local/include/libacars-2. New pkg-config script libacars-2.pc provides
  updated compiler and linker flags. Version 2 can be installed in parallel with
  version 1.
• New feature: generic engine for reassembly of fragmented messages. Supports
  automatic tracking of fragments' sequence numbers (with possible wraparounds),
  handles reassembly timeouts and fragment deduplication. Messages can be keyed
  with arbitrary data (eg. custom header fields).
• New feature: automatic reassembly of ACARS messages. New function
  la_acars_parse_and_reassemble performs both parsing and reassembly, while
  existing la_acars_parse function performs parsing only and works as before.
• New feature: automatic reassembly of MIAM file transfers. New function
  la_miam_parse_and_reassemble performs both parsing and reassembly, while
  existing la_miam_parse function performs parsing only and works as before.
• New feature: pretty-printing of XML text in ACARS and MIAM CORE payloads.
  If the message text is identified as XML (ie. it parses without errors),
  la_acars_format_text and la_miam_core_format_text routines will print
  it with proper indentation for better readability. The feature is optional,
  depends on libxml2 and must be turned on by setting prettify_xml
  configuration variable to true.
• New feature: simple hash table implementation. Mostly used for libacars internal
  purposes, but it's exposed in the API and can be used for any purpose.
• New feature: when compiled with debugging support, debug output to stderr is
  now configurable with LA_DEBUG environment variable. Set it to the desired
  verbosity level - from 0 (none) to 3 (verbose). The default is 0 (debug output
  suppressed).
• Incompatible change: new library configuration API. la_config structure
  with static fields has been removed. Configuration variables are now
  stored in a hash table, read with la_config_get_* and set with
  la_config_set_* functions. Refer to doc/API_REFERENCE.md for details.
  Refer to libacars/config_defaults.h for the most current list of
  configuration options and their default values.
• Incompatible change: ACARS parser now strips sublabel and MFI (Message
  Function Identifier) fields from the message text, if present. Their values are
  stored in la_acars_msg structure in sublabel and mfi fields. In text
  and JSON output they are printed as separate fields.
• Incompatible change: MIAM parser and ARINC-622 ATS message parser now expect
  sublabel and MFI fields to be stripped by the caller, otherwise the parser
  will ignore the message. This operation can be performed with minimal fuss
  using la_acars_extract_sublabel_and_mfi function.
• Incompatible change: la_miam_parse function prototype has changed. All
  parameters except txt (message text) have been removed.
• Incompatible change: no field of la_acars_msg structure has been removed.
  MSN is now stored in two fields: msg_num (first three characters)
  and msg_num_seq (last character, ie. sequence indicator).
• Incompatible change: Media Advisory message timestamp and version are now
  stored as numbers, not characters. Type of hour, minute, second and
  version fields in la_media_adv_msg structure has been changed from char[]
  to uint8_t. Relevant JSON keys have changed types as well.
• Incompatible change: state and current_link fields in la_media_adv_msg
  structure changed from char[2] to char, hence their values are no longer
  NULL-terminated.
• examples: media_advisory app has been removed. Use decode_acars_apps instead.
• Bugfixes, code cleanups.

Version 1.3.1

• Binary releases for Windows were mistakenly built with AVX instruction set enabled which caused the lib to fail on older CPUs (#3). Thanks to G7GQW for reporting and to Jonti Olds for analysis.
• Downgraded optimization level for release builds from -O3 to -O2 to reduce chances of similar problems for cross-platform builds.

Version 1.3.0

• JSON output support for all message types. Any protocol tree can be serialized into a JSON string with la_proto_tree_format_json() function. Functions for serializing each individual message type into JSON are provided as well. Refer to doc/API_REFERENCE.md for details.
• decode_acars_apps application now supports both human readable and JSON output. To enable JSON output, set LA_JSON environment variable to any value. If LA_JSON is not set, the program displays human readable output.
• Small bugfixes in ACARS and MIAM decoders.