Crimson config blob (crimson.cfg)¶

crimson.cfg is the fixed-size configuration blob used by the classic Crimsonland executable. It is not the save/status file (that is game.cfg).

Location and size¶

• Path: game_base_path\\crimson.cfg (built via game_build_path).
• Size: 0x480 bytes (1152 bytes).
• Endianness: little-endian for integer/float fields.

Struct view (crimson_cfg_t)¶

config_blob (DAT_00480348) is typed as crimson_cfg_t:

typedef struct crimson_cfg_t {
    unsigned char reserved0[0x0a8];
    char saved_names[8][27];
    char player_name[32];
    int player_name_length;
    unsigned char reserved1[0x14];
    int display_bpp;
    int screen_width;
    int screen_height;
    int windowed;
    int keybinds_p1[13];
    unsigned char reserved2[0x0c];
    int keybinds_p2[13];
    unsigned char reserved3[0x0c];
    unsigned char reserved4[0x200];
    unsigned char hardcore;
    unsigned char full_version;
    unsigned char reserved5[2];
    int perk_prompt_counter;
    unsigned char reserved6[0x14];
    float sfx_volume;
    float music_volume;
    unsigned char fx_toggle;
    unsigned char score_load_gate;
    unsigned char reserved7[2];
    int detail_preset;
    unsigned char reserved8[4];
    int key_pick_perk;
    int key_reload;
} crimson_cfg_t;

Observed file:

• game_bins/crimsonland/1.9.93-gog/crimson.cfg
• size 0x480
• width 1024, height 768
• windowed flag = 1
• texture scale = 1.0

Hardcoded defaults (from config_sync_from_grim when grim_config_invoked is set):

• width 800, height 600
• windowed flag = 0 (fullscreen)
• bpp = 32
• sfx/music volume = 1.0
• player name defaults to 10tons
• saved names default to "default" x8

Load / write behavior¶

From the decompile (see docs/detangling.md):

• config_load_presets reads the 0x480-byte blob into config_blob.
• config_sync_from_grim:
• seeds a default blob (in memory)
• reads Grim config values (vtable +0x24)
• loads crimson.cfg overrides when present
• writes the 0x480-byte blob back out
• config_ensure_file writes crimson.cfg when missing.

This means the file is treated as a fixed struct and rewritten wholesale.

Field layout¶

Base address in the decompile is DAT_00480348. Offsets below are relative to the blob start.

Keybind Block Structure¶

Each player block is 52 bytes (13 dwords), followed by 12 bytes padding. The values map to DirectInput key codes (scancodes).

Offset refers to index within the block (0-12).

P3/P4 Note: The game loop in config_load_presets iterates only twice (for P1 and P2). The large gap after P2 suggests P3/P4 slots might have been planned but are not loaded by this version of the executable.

Notes¶

• The blob is always written at full size; unknown fields should be preserved when round-tripping.

• game.cfg is a different file (save/status) and does not share this layout.