Mpeg Audioのタグ情報を取ってくる場合には

ファイルの最後尾から128バイトのデータを取ってきて
以下の情報を確保します

128Byteの内容は以下の通りです
上から順に

 3 Byte  "TAG"という文字列が入っていますこれでID3TAGかどうかのチェックをします
30 Byte  曲のタイトル
30 Byte  アーティストの名前
30 Byte  アルバム名
 4 Byte  リリースされた日付
30 Byte  コメント
 1 Byte  ジャンル


ジャンル以外は文字列データを入力します。

ジャンルの内容は値によって以下の種類が有ります(16進で表記しています)

{"A Cappella",                  0x7b},
{"Acid",                        0x22},
{"Acid Jazz",                   0x4a},
{"Acid Punk",                   0x49},
{"Acoustic",                    0x63},
{"Alt. Rock",                   0x28},
{"Alternative",                 0x14},
{"Ambient",                     0x1a},
{"Anime",                       0x91},
{"Avantgarde",                  0x5a},
{"Ballad",                      0x74},
{"Bass",                        0x29},
{"Beat",                        0x87},
{"Bebob",                       0x55},
{"Big Band",                    0x60},
{"Black Metal",                 0x8a},
{"Bluegrass",                   0x59},
{"Blues",                       0x00},
{"Booty Bass",                  0x6b},
{"BritPop",                     0x84},
{"Cabaret",                     0x41},
{"Celtic",                      0x58},
{"Chamber Music",               0x68},
{"Chanson",                     0x66},
{"Chorus",                      0x61},
{"Christian Gangs",             0x88},
{"Christian Rap",               0x3d},
{"Christian Rock",              0x8d},
{"Classic Rock",                0x01},
{"Classical",                   0x20},
{"Club",                        0x70},
{"Club-House",                  0x80},
{"Comedy",                      0x39},
{"Contemporary Christian",      0x8c},
{"Country",                     0x02},
{"Crossover",                   0x8b},
{"Cult",                        0x3a},
{"Dance",                       0x03},
{"Dance Hall",                  0x7d},
{"Darkwave",                    0x32},
{"Death Metal",                 0x16},
{"Disco",                       0x04},
{"Dream",                       0x37},
{"Dram & Bass",                 0x7f},
{"Drum Solo",                   0x7a},
{"Duet",                        0x78},
{"Easy Listening",              0x62},
{"Electronic",                  0x34},
{"Ethnic",                      0x30},
{"Eurodance",                   0x36},
{"Euro-House",                  0x7c},
{"Euro-Techno",                 0x19},
{"Fast-Fusion",                 0x54},
{"Folk",                        0x50},
{"Folk/Rock",                   0x51},
{"Folklore",                    0x73},
{"Freestyle",                   0x77},
{"Funk",                        0x05},
{"Fusion",                      0x1e},
{"Game",                        0x24},
{"Gangsta Rap",                 0x3b},
{"Goa",                         0x7e},
{"Gospel",                      0x26},
{"Gothic",                      0x31},
{"Gothic Rock",                 0x5b},
{"Grunge",                      0x06},
{"Hard Rock",                   0x4f},
{"Hardcore",                    0x81},
{"Heavy Metal",                 0x89},
{"Hip-Hop",                     0x07},
{"House",                       0x23},
{"Humour",                      0x64},
{"Indie",                       0x83},
{"Industirial",                 0x13},
{"Instrumental",                0x21},
{"Instrumental Pop",            0x2e},
{"Instrumental Rock",           0x2f},
{"Jazz",                        0x08},
{"Jazz+Funk",                   0x1d},
{"JPop",                        0x92},
{"Jungle",                      0x3f},
{"Latin",                       0x56},
{"Lo-Fi",                       0x47},
{"Meditative",                  0x2d},
{"Merengue",                    0x8e},
{"Metal",                       0x09},
{"Musical",                     0x4d},
{"National Folk",               0x52},
{"Native American",             0x40},
{"Negerpunk",                   0x85},
{"New Age",                     0x0a},
{"New Wave",                    0x42},
{"Noise",                       0x27},
{"Oldies",                      0x0b},
{"Opera",                       0x67},
{"Other",                       0x0c},
{"Polka",                       0x4b},
{"Polsk Punk",                  0x86},
{"Pop",                         0x0d},
{"Pop/Funk",                    0x3e},
{"Pop-Folk",                    0x35},
{"Porn Groove",                 0x6d},
{"Power Ballad",                0x75},
{"Pranks",                      0x17},
{"Primus",                      0x6c},
{"Progressive Rock",            0x5c},
{"Psychedelic",                 0x43},
{"Psychedelic Rock",            0x5d},
{"Punk",                        0x2b},
{"Punk Rock",                   0x79},
{"R&B",                         0x0e},
{"Rap",                         0x0f},
{"Rave",                        0x44},
{"Reggae",                      0x10},
{"Retro",                       0x4c},
{"Revival",                     0x57},
{"Rhythmic Soul",               0x76},
{"Rock",                        0x11},
{"Rock & Roll",                 0x4e},
{"Salsa",                       0x8f},
{"Samba",                       0x72},
{"Satire",                      0x6e},
{"Showtunes",                   0x45},
{"Ska",                         0x15},
{"Slow Jam",                    0x6f},
{"Slow Rock",                   0x5f},
{"Sonata",                      0x69},
{"Soul",                        0x2a},
{"Sound Clip",                  0x25},
{"Soundtrack",                  0x18},
{"Southern Rock",               0x38},
{"Space",                       0x2c},
{"Speech",                      0x65},
{"Swing",                       0x53},
{"Symphonic Rock",              0x5e},
{"Symphony",                    0x6a},
{"Synthpop",                    0x93},
{"Tango",                       0x71},
{"Techno",                      0x12},
{"Techno-Industrial",           0x33},
{"Terror",                      0x82},
{"Thrash Metal",                0x90},
{"Top 40",                      0x3c},
{"Trailer",                     0x46},
{"Trance",                      0x1f},
{"Tribal",                      0x48},
{"Trip-Hop",                    0x1b},
{"Vocal",                       0x1c}