Difference between revisions of "Replay file"
From Worms Knowledge Base
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| − | | xx | + | | xx xx xx xx zz zz zz zz |
| − | | '''Checksum''' | + | | '''Checksum'''. xx is the current time and zz the checksum (current time is very usefull to know the total game time, because there is no frames when nobody is playing ! |
| 02 08 xx yy 00 00 zz zz zz zz | | 02 08 xx yy 00 00 zz zz zz zz | ||
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| − | | '''Releasing of a power-managed weapon''' ( | + | | '''Releasing of a power-managed weapon''' (Bazook |
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== Security == | == Security == | ||
Revision as of 18:35, 14 November 2007
Replay (.WAgame) files were introduced to Worms Armageddon with Deadcode's 3.6.19.7 beta update, which was released on 9 February, 2004. The files represent self-contained recordings of games, which can be played on any computer with the corresponding software updates installed.
Recordings of all games played (including offline, mission and training games) are saved automatically to the User\Games folder. File names consist of a date/time stamp, the game type, and the participating players.
The files contain all the information needed to play the replay flawlessly. This includes the game version which was emulated during the game, the map and the scheme, the participating teams (including the custom flags and graves), and the random seed used for random in-game events (such as random initial placement of worms and objects).
File format
A typical replay file consists of a 4-byte header, a map chunk, a settings chunk, and the message (user input) stream.
The file header consists of two signature bytes ("WA"), after which follows a word with the file version. W:A 3.6.26.5 saves replays in the version 12 format (0x000C).
After the header is the map chunk. The map chunk represents a DWORD which represents the chunk's contents' length (chunk length-4, or map length+4), followed by the chunk data. The first DWORD of the chunk's data specifies the map type - it can be 1 for Monochrome map (.bit), 2 for Seed-generated monochrome map, or 3 for Colour map. The map data follows, its length being the chunk's length - 4.
Following the map data is the settings (initialization) chunk. Its structure:
- 3 usually null bytes
- the replay file version (see header), a 2nd time (WORD)
- the replay date/time in time_t format
- a null byte
- game engine version to emulate (0x30 represents 3.6.26.5; 0x4C represents 3.6.28) (DWORD)
- game type (normal=1, mission=2, training=3) (byte)
- scheme type (usually 0xFF, positive value for intrinsic schemes) (byte)
- the scheme - see Game scheme file (length is determined by the scheme file format version)
- initial logic (random) seed (DWORD)
- blood amount (byte)
- rope knocking (byte)
- the game ID (Pascal string)
- local machine ID (byte)
This is followed by the data about connected machines, and teams.
User Input
Generalities
After the padding mentioned above, the game starts with a 09 xx xx xx xx 00. The four xx bytes are still to be determined. Each new turn is initiated by that 00 byte, and before advancing, the game engine will wait until all pending actions are stabilized (Mines triggered, flames falling, animals running, ...). Each turn is divided in frames, at a rate of 50 frames per second. Those frames are seperated by a 02 byte. A frame can be empty, or contain the actions taken at that very moment. Each 25 frames, the word 0C 1E is inserted. Its purpose is yet unknown, and it is sometimes followed by a byte ranging from 03 to 07, for unknown reasons too. Each time an weapon is used, a checksum gets inserted into the following frame.
Actions
Actions are usually constituted by 2 Bytes, the first one coding for the action, and the second one coding for the active team (01-06). However, it is not possible to change the "Active team" byte to move another worm while it's not his turn. For example, the action 1E corresponds to the left arrow ; the action 21 to the down arrow. If the active worm is in the third team, the frame will look like "02 1E 03 21 03" (New frame, pressing left and pressing up). Some actions are more complex, and require therefore additional arguments. Those are typically inserted before or after the "Active team" byte. Here is a list of actions codes, along with their arguments when applicable.
| Code | Arguments | Action | Example |
|---|---|---|---|
| 02 | Frame end. | 02 | |
| 08 | xx xx xx xx zz zz zz zz | Checksum. xx is the current time and zz the checksum (current time is very usefull to know the total game time, because there is no frames when nobody is playing ! | 02 08 xx yy 00 00 zz zz zz zz |
| 0F | xx yy FF tt .. tt 00 | Discussion (in chatbox). tt .. tt is the text string, xx and yy represent sender and receiver of the text. More details about this have still to be added. | 00 0F 01 01 FF tt .. tt 00 |
| 11 | xx xx xx xx | Mouse placing. The 4 xx bytes represent the position of the mouse on the screen. | 02 11 01 xx xx xx xx : Player 1 has placed the mouse at xx xx xx xx |
| 12 | xx | Orienting a girder. xx represent the new orientation of the girder. (01-0F) | 02 12 01 0B 01 : Player 1 oriented the girder to a long topright inclined girder. |
| 13 | xx | Shifting strike aimer. xx represent the new orientation of the Aimer. (01 to the right ; FF to the left) | 02 13 01 01 : Player 1 oriented the strike aimer to the right (Pressing Left key). |
| 1A | Thought bubble : Equivalent to keypress T | 02 1A 01 : Player 2 displayed a Thought Bubble over controlled worm. | |
| 1E | Left arrow (In all its in-game usages) | 02 1E 02 21 02 : Player 2 had Up-Left pressed in that frame. | |
| 1F | Right arrow | ||
| 20 | Up arrow (In all its in-game usages) | ||
| 21 | Down arrow | ||
| 24 | Releasing (unmounting) of the ninja rope ; Forward Jump ; Backward jump if used twice (Not in the same frame). | 02 24 04 02 02 02 02 24 04 02 02 : Player 4 pressed Enter twice, with a 3 frames interval, to backjump | |
| 25 | Up jump, Backflip if used twice (Not in the same frame) | 02 25 04 02 02 02 02 24 04 02 02 : Player 4 pressed Backspace-Enter, with a 3 frames interval, to backjump | |
| 26 | Usage (launching) of a weapon, from the ground or from any utility (Rope, parachute, ...) allowing weapon drops. It can appear several times for weapons having multiple shots (shotgun, rope, ...), but not in the same frame. It triggers a checksum except in the case of a ninja rope being re-fired from the air. | 02 26 01 02 08 xx yy 00 00 zz zz zz zz 02 20 01 02 20 01 02 20 01 02 20 01 02 20 01 02 24 01 02 26 01 : Player 1 fires the ninja rope, causing a checksum, then shortens it during 5 frames, then releases it and fires it again. The second firing won't generate any checksum. | |
| 27 | Releasing of a power-managed weapon (Bazook
SecurityThe format incorporates periodic checksums, embedded into specific actions. This allows to detect modifications to the replay, causing warning messages during playback. The tool-assisted versions of W:A save replays in an encrypted format, which is playable only with the tool-assisted version. Only Deadcode can decrypt them, thus making them playable with normal versions of W:A.
Export LogA log file can be extracted from a replay file to give a text representation of what happens in the replay. The log file includes:
Log suggestions
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