ID3v1.1 tag for .mp3 files: Lua parsing library

-- This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
--
-- This file is compatible with Lua 5.3

local class = require("class")
require("kaitaistruct")
local enum = require("enum")
local str_decode = require("string_decode")

-- 
-- ID3v1.1 tag is a method to store simple metadata in .mp3 files. The
-- tag is appended to the end of file and spans exactly 128 bytes.
-- 
-- This type is supposed to be used on full .mp3 files, seeking to
-- proper position automatically. If you're interesting in parsing only
-- the tag itself, please use `id3v1_1::id3_v1_1_tag` subtype.
-- See also: Source (https://id3.org/ID3v1)
Id3v11 = class.class(KaitaiStruct)

function Id3v11:_init(io, parent, root)
  KaitaiStruct._init(self, io)
  self._parent = parent
  self._root = root or self
  self:_read()
end

function Id3v11:_read()
end

Id3v11.property.id3v1_tag = {}
function Id3v11.property.id3v1_tag:get()
  if self._m_id3v1_tag ~= nil then
    return self._m_id3v1_tag
  end

  local _pos = self._io:pos()
  self._io:seek((self._io:size() - 128))
  self._m_id3v1_tag = Id3v11.Id3V11Tag(self._io, self, self._root)
  self._io:seek(_pos)
  return self._m_id3v1_tag
end


-- 
-- ID3v1.1 tag itself, a fixed size 128 byte structure. Contains
-- several metadata fields as fixed-size strings.
-- 
-- Note that string encoding is not specified by standard, so real
-- encoding used would vary a lot from one implementation to
-- another. Most Windows-based applications tend to use "ANSI"
-- (i.e. locale-dependent encoding, usually one byte per
-- character). Some embedded applications allow selection of
-- charset.
Id3v11.Id3V11Tag = class.class(KaitaiStruct)

Id3v11.Id3V11Tag.GenreEnum = enum.Enum {
  blues = 0,
  classic_rock = 1,
  country = 2,
  dance = 3,
  disco = 4,
  funk = 5,
  grunge = 6,
  hip_hop = 7,
  jazz = 8,
  metal = 9,
  new_age = 10,
  oldies = 11,
  other = 12,
  pop = 13,
  rnb = 14,
  rap = 15,
  reggae = 16,
  rock = 17,
  techno = 18,
  industrial = 19,
  alternative = 20,
  ska = 21,
  death_metal = 22,
  pranks = 23,
  soundtrack = 24,
  euro_techno = 25,
  ambient = 26,
  trip_hop = 27,
  vocal = 28,
  jazz_funk = 29,
  fusion = 30,
  trance = 31,
  classical = 32,
  instrumental = 33,
  acid = 34,
  house = 35,
  game = 36,
  sound_clip = 37,
  gospel = 38,
  noise = 39,
  alternrock = 40,
  bass = 41,
  soul = 42,
  punk = 43,
  space = 44,
  meditative = 45,
  instrumental_pop = 46,
  instrumental_rock = 47,
  ethnic = 48,
  gothic = 49,
  darkwave = 50,
  techno_industrial = 51,
  electronic = 52,
  pop_folk = 53,
  eurodance = 54,
  dream = 55,
  southern_rock = 56,
  comedy = 57,
  cult = 58,
  gangsta = 59,
  top_40 = 60,
  christian_rap = 61,
  pop_funk = 62,
  jungle = 63,
  native_american = 64,
  cabaret = 65,
  new_wave = 66,
  psychadelic = 67,
  rave = 68,
  showtunes = 69,
  trailer = 70,
  lo_fi = 71,
  tribal = 72,
  acid_punk = 73,
  acid_jazz = 74,
  polka = 75,
  retro = 76,
  musical = 77,
  rock_n_roll = 78,
  hard_rock = 79,
  folk = 80,
  folk_rock = 81,
  national_folk = 82,
  swing = 83,
  fast_fusion = 84,
  bebob = 85,
  latin = 86,
  revival = 87,
  celtic = 88,
  bluegrass = 89,
  avantgarde = 90,
  gothic_rock = 91,
  progressive_rock = 92,
  psychedelic_rock = 93,
  symphonic_rock = 94,
  slow_rock = 95,
  big_band = 96,
  chorus = 97,
  easy_listening = 98,
  acoustic = 99,
  humour = 100,
  speech = 101,
  chanson = 102,
  opera = 103,
  chamber_music = 104,
  sonata = 105,
  symphony = 106,
  booty_bass = 107,
  primus = 108,
  porn_groove = 109,
  satire = 110,
  slow_jam = 111,
  club = 112,
  tango = 113,
  samba = 114,
  folklore = 115,
  ballad = 116,
  power_ballad = 117,
  rhythmic_soul = 118,
  freestyle = 119,
  duet = 120,
  punk_rock = 121,
  drum_solo = 122,
  a_capella = 123,
  euro_house = 124,
  dance_hall = 125,
}

function Id3v11.Id3V11Tag:_init(io, parent, root)
  KaitaiStruct._init(self, io)
  self._parent = parent
  self._root = root or self
  self:_read()
end

function Id3v11.Id3V11Tag:_read()
  self.magic = self._io:read_bytes(3)
  if not(self.magic == "\084\065\071") then
    error("not equal, expected " ..  "\084\065\071" .. ", but got " .. self.magic)
  end
  self.title = self._io:read_bytes(30)
  self.artist = self._io:read_bytes(30)
  self.album = self._io:read_bytes(30)
  self.year = str_decode.decode(self._io:read_bytes(4), "ASCII")
  self.comment = self._io:read_bytes(30)
  self.genre = Id3v11.Id3V11Tag.GenreEnum(self._io:read_u1())
end

-- 
-- Song title.
-- 
-- Artist name.
-- 
-- Album title.
-- 
-- Year of release.
-- 
-- Arbitary comment.