3DS "area:" archive research

3ds-0004009B00010402.txt

"$(country_id)_LZ.bin"
[LZ]{
    struct {
        u32 entry_count?;
        
        struct { // size=0x818
            struct {
                u8 zero?
                u8 zero?
                u8 region_id;
                u8 country_id;
            } address_id;
            struct {
                char16_t region_name[0x40]
            } region_names[0x10];
            u8 sort_index?[0x10];
            u16 latitude; // 0x0000~0x4000 -> +0~+90; 0xC000~0xFFFF -> -90~-0
            u16 longitude; // 0x0000~0x8000 -> +0~+180; 0x8000~0xFFFF-> -180~-0
            
        } regions[1+entry_count]
    } sections?[?]
    
    u8 ?[entry_count_0+1?][0x10]
    //...
}

"country_LZ.bin"
[LZ]{
    struct{
        u32 entry_count;
        
        struct { // size=0x83C
            struct {
                u8 zero?
                u8 zero?
                u8 zero?
                u8 country_id;
            } address_id;
            u32 region_count?; // max_region_id? 
            u32 ?; //bool?
            struct {
                char16_t country_name[0x40]
            } country_names[0x10];
            u8 sort_index?[0x10];
            u8 zero_padding[0x20];
        } country_entries[entry_count];
    } sections?[2]
    
    u8 ?[entry_count_0][0x10]
    //..
    
}