===== Compression =====

==== Overview ====

FF3us contains a number of compressed data chunks to save space. The compression algorithm is a variation of the LZSS compression algorithm.

The decompression routine can be found at ''C2/FF6D'' there is also a [[http://www.romhacking.net/utilities/1176/ |perl script]] available to decompress and recompress chunks.

==== List of compressed chunks ====

^ Start ^ End ^ Description ^
| ''C0F500'' | ''C0FCFF'' | Sprite Overlay Data (45 items, compressed, 16 + 256 bytes each) |
| ''C2686C'' | ''C28A6F'' | Title, Intro, Floating Island, & World Cinematic Program (compressed) |
| ''C4BA00'' | ''C4C007'' | Ending Font (compressed) |
| ''C4C008'' | ''C4F476'' | Ending Cinematic Graphics and Tile Formation (compressed) |
| ''C4F477'' | ''C4F6FA'' | Ending Cinematic Graphics (compressed) |
| ''C4F6FB'' | ''C4FFFF'' | Ending Cinematic Graphics (compressed) |
| ''D2E000'' | ''D2EBFF'' | Battle Status Graphics, etc. (compressed) |
| ''D8D000'' | ''D8DAF1'' | Setzer's Airship on Fire Graphics (compressed) |
| ''D8DAF2'' | ''D8DCFF'' | Setzer's Airship on Fire Tile Formation (compressed) |
| ''D8DD00'' | ''D8DFB7'' | Pointers to Magitek Train Ride Tile Graphics (29 items, 12x2 bytes each, +$7E0000) |
| ''D8DFB8'' | ''D8E5BE'' | Vector Panorama Graphics (compressed) |
| ''D8E5BF'' | ''D8E6B9'' | Vector Panorama Tile Formation (compressed) |
| ''D8E6BA'' | ''D8E7FF'' | Serpent Trench Palettes (compressed) |
| ''D8F000'' | ''D94E95'' | [[ff3:ff3us:doc:asm:decompressed:title_gfx |Title/Intro Graphics]] (compressed) |
| ''D94E96'' | ''D9568E'' | Floating Island Cinematic Graphics (compressed) |
| ''D9568F'' | ''D99D4A'' | Ending Cinematic Graphics (compressed) |
| ''D99D4B'' | ''D9A4E4'' | Ending Cinematic Graphics (compressed) |
| ''D9A4E5'' | ''D9A7FF'' | Ending Cinematic Graphics (compressed) |
| ''D9A800'' | ''D9CD0F'' | [[ff3:ff3us:doc:asm:fmt:map_tile_properties | Map Tile Properties]] (42 items, compressed) |
| ''D9D1B0'' | ''DDFFFF'' | Map Formations (350 items, compressed) |
| ''DE0000'' | ''DFB3FF'' | Map Tile Formations (75 items, compressed) |
| ''E68780'' | ''E6CD5F'' | BG3 Graphics (19 items, compressed) |
| ''E6CDC0'' | ''E6F1FF'' | [[http://ff6hacking.com/wiki/doku.php?id=ff3:ff3us:doc:asm:fmt:bg3_animation_data | BG3 Animation Graphics]] (6 items, compressed) |
| ''E71928'' | ''E7A9E6'' | Battle BG Tile Formations (50 items, 2048 bytes each, compressed) |
| ''E7A9E7'' | ''E962FF'' | Battle BG Graphics (75 items, compressed) |
| ''ECE900'' | ''ECFFFF'' | World Getting Torn Apart Cinematic Graphics (compressed) |
| ''EEB290'' | ''EEC294'' | World Map Clouds Graphics (compressed) |
| ''EEC295'' | ''EEC701'' | World Map Clouds Tile Formation (compressed) |
| ''EEC702'' | ''EED433'' | Setzer's Airship Graphics (compressed) |
| ''EED434'' | ''EF114E'' | World of Balance Map Formation (compressed) |
| ''EF114F'' | ''EF324F'' | World of Balance Graphics (compressed) |
| ''EF3250'' | ''EF4845'' | Magitek Train Ride Graphics (variable size tiles, compressed) |
| ''EF4A46'' | ''EF6A55'' | World of Ruin Graphics (compressed) |
| ''EF6A56'' | ''EF9D16'' | World of Ruin Map Formation (compressed) |
| ''EF9D17'' | ''EFB630'' | Serpent Trench Map Formation (compressed) |
| ''EFB631'' | ''EFC623'' | Serpent Trench Graphics (compressed) |
| ''EFC624'' | ''EFCE76'' | Some Chocobo Graphics (compressed) |
| ''EFCEB7'' | ''EFCFB8'' | Airship Shadow and Perspective Graphics (compressed) |
| ''EFCFB9'' | ''EFDC4B'' | Various Sprites (ship, esper terra, figaro, etc., compressed) |
| ''EFDC4C'' | ''EFE49A'' | More Chocobo Graphics (world map, compressed) |
| ''EFE49B'' | ''EFE8B2'' | World of Balance Minimap Graphics (compressed) |
| ''EFE8B3'' | ''EFED25'' | World of Ruin Minimap Graphics (compressed) |
| ''EFED26'' | ''EFFAC7'' | Daryl's Airship Graphics (compressed) |