GRAND THEFT AUTO 1 - FORMAT OF PLAYER_A.DAT
Analysis by Daniel Marschall, 11 Feb 2019
Current release: https://misc.daniel-marschall.de/spiele/gta1/player_a_format.txt


// London 1969:   0x2FF bytes (gtadata\uk\player_a.dat)
// London 1961:   0x194 bytes (gtadata\uk\player_e.dat)
// GTA1 Retail:   0x3F1 bytes (gtadata\player_a.dat)
// GTA1 Classics: 0x414 bytes (gtadata\player_a.dat)
PlayerA {
	// London 1969:   0x12 bytes
	// London 1961:   0x12 bytes
	// GTA1 Retail:   0x12 bytes
	// GTA1 Classics: 0x18 bytes
	Options {
		byte soundVolume;          // 0 = off, 1..7
		byte musicVolume;          // 0 = off, 1..7
		byte textSpeed;            // 1..3
		byte radioMode;            // 0=radio, 1=constant
		byte resolution;           // Dependent on the system.
		                           // In Rockstar Classics:
		                           // 00 = 640x480x16
		                           // 01 = 800x600x16
		                           // 02 = 1024x768x16
		                           // 03 = 640x480x32
		                           // 04 = 800x600x32
		                           // 05 = 1024x768x32
		byte resolution_default;   // will be initialized with the same value as "resolution", but will then never be read or written for any purpose
		byte reserved;             // will not be read or written by the code for any purpose
		byte transparencyEffects;  // 0=off, 1=on
		byte deathmatch_mode;      // 0=score, 1=kills; in Rockstar Classics: DWORD
		DWORD deathmatch_score;    // default = 100000
		DWORD deathmatch_kills;    // default = 10
		byte language;             // in Rockstar Classics: DWORD
		                           // 0 = English
		                           // 1 = French
		                           // 2 = German
		                           // 3 = Italian
		                           // 4 = Japanese
		                           // 99 = English with swear words (special.fxt)
		                           // 255 (default) = Take value from registry (HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\DMA Design\Grand Theft Auto), default
	}
	
	// London 1969:   12 sets á 0x13 bytes
	// London 1961:    3 sets á 0x13 bytes
	// GTA1 Retail:   18 sets á 0x13 bytes
	// GTA1 Classics: 18 sets á 0x14 bytes
	Top3HighScores[18] {
		DWORD score;
		szString[0xF] playerName;  // in Rockstar Classics: szString[0x10]
	}
	
	// London 1969:   8 sets á 0x4F bytes
	// London 1961:   8 sets á 0x4F bytes
	// GTA1 Retail:   8 sets á 0x4F bytes
	// GTA1 Classics: 8 sets á 0x50 bytes
	Player[8] {
		szString[0xF] playerName;  // in Rockstar Classics: szString[0x10]
		int32[6] levelHighscore.   // -1 = level not unlocked
		DWORD unknown1
		DWORD multiplayer_selected_area; // 0=LC, 1=SA, 2=VC
		DWORD unknown2
		DWORD multiplayer_selected_game; // 0=deathmatch, 1..3=canonball 1..3
		longbool[6] videoUnlocked; // 0=not unlocked, 1=unlocked
	}
	
	// London 1969:   0x11 bytes
	// London 1961:   0x11 bytes
	// GTA1 Retail:   0x11 bytes
	// GTA1 Classics: 0x14 bytes
	Footer {
		byte selectedPlayerID;   // values = 1..8
		szString[0x10] multiplayer_host_title; // default = "GTA Game"; in Rockstar Classics: szString[0x13]
	}
}


Some notes about PLAYER_A.DAT (contains scores, players, level complete etc)
- Player_a.dat of GTA Classics/Steam and GTA Retail are incompatible!
- GTA Classics will crash if the fifth byte is not equal to 6.
  GTA Classics can therefore not correctly load the previous selected resolution.