129 lines
5.0 KiB
GDScript3
129 lines
5.0 KiB
GDScript3
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extends Node
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const SLOT_IN_USE := 0xE41B
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# FFV SRAM is 4 slots of 0x700byte save files
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# $0000-$06FF - Save Slot 1
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# $0700-$0DFF - Save Slot 2
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# $0E00-$14FF - Save Slot 3
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# $1500-$1BFF - Save Slot 4
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# $1C00-$1FEF - Empty
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# $1FF0-$1FF7 - Checksum (2 bytes per slot)
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# $1FF8-$1FFF - use table - contains $E41B if a slot is in use (deleting a save will just change this)
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# Checksum just sums up every 16bit word from 0x000-0x600 of the save slot, using the carry flag.
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# The carry flag means that it is not strictly modulo arithmetic, but you have to add 1 every time you pass 0xFFFF
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# Offsets within save slot
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# $000:600 = $500:B00 in WRAM (0x7E0500:0x7E0B00) only values that don't match are things like game frame timer which increments immediately after load
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#
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# $000-$04F - Character Slot 1
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# $050=$09F - Character Slot 2
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# $0A0=$0EF - Character Slot 3
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# $0F0=$13F - Character Slot 4
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# $447-$449 - Current Gil
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#
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# $5D8 - Current Map X position
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# $5D9 - Current Map Y position
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#
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# $600-$6FF - Appears to be unused and zeroed out, not used for checksum. Maybe we can use it for cool metadata? :)
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func get_slot_checksum(slot: StreamPeerBuffer) -> int:
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slot.seek(0)
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var checksum := 0
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for i in 0x600: # Last 0x100 bytes aren't checksummed
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checksum += slot.get_16()
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if checksum > 0xFFFF: # Addition of shorts can only overflow
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checksum &= 0xFFFF
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if i < 0x5FF:
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checksum += 1 # TODO: confirm this carry flag edge case is correct!
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return checksum
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func get_character(slot: StreamPeerBuffer, character_slot_id: int) -> Dictionary:
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var character := {}
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slot.seek(0x50 * character_slot_id)
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var b := slot.get_8()
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character['id'] = b & 0x07 # 0Bartz/1Lenna/2Galuf/3Faris/4Krile/5/6/7
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character['gender'] = (b >> 3) & 1 # 0 = male, 1 = female
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# Two unknown, possibly unused bits
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character['present'] = (b >> 6) & 1 # 0 = absent?
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character['back_row'] = (b >> 7) & 1
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character['job_id'] = slot.get_8()
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character['level'] = slot.get_8()
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character['experience'] = slot.get_16() | (slot.get_8() << 16)
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character['hp_current'] = slot.get_16()
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character['hp_max'] = slot.get_16()
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character['mp_current'] = slot.get_16()
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character['mp_max'] = slot.get_16()
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character['equipped_head'] = slot.get_8()
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character['equipped_body'] = slot.get_8()
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character['equipped_acc'] = slot.get_8()
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character['equipped_rh_shield'] = slot.get_8()
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character['equipped_lh_shield'] = slot.get_8()
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character['equipped_rh_weapon'] = slot.get_8()
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character['equipped_lh_weapon'] = slot.get_8()
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character['caught_monster'] = slot.get_8()
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character['ability_1'] = slot.get_8()
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character['ability_2'] = slot.get_8()
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character['ability_3'] = slot.get_8()
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character['ability_4'] = slot.get_8()
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character['action_flags'] = slot.get_8()
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character['damage_mod'] = slot.get_8()
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character['innates'] = slot.get_16()
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character['magic_element_up'] = slot.get_8()
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character['equip_weight'] = slot.get_8()
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character['base_strength'] = slot.get_8()
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character['base_agility'] = slot.get_8()
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character['base_stamina'] = slot.get_8()
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character['base_magic'] = slot.get_8()
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character['current_strength'] = slot.get_8()
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character['current_agility'] = slot.get_8()
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character['current_stamina'] = slot.get_8()
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character['current_magic'] = slot.get_8()
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character['evasion'] = slot.get_8()
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character['defense'] = slot.get_8()
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character['magic_evasion'] = slot.get_8()
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character['magic_defense'] = slot.get_8()
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character['elemental_absorb'] = slot.get_8()
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character['elemental_evade'] = slot.get_8()
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character['elemental_immune'] = slot.get_8()
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character['elemental_half'] = slot.get_8()
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character['elemental_weakness'] = slot.get_8()
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character['resistance_status_1'] = slot.get_8()
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character['resistance_status_2'] = slot.get_8()
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character['resistance_status_3'] = slot.get_8()
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character['specialty_weapon'] = slot.get_8()
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character['specialty_equipment'] = slot.get_8()
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character['current_job_level'] = slot.get_8()
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character['current_job_abp'] = slot.get_16()
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character['spell_level_1'] = slot.get_8()
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character['spell_level_2'] = slot.get_8()
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character['spell_level_3'] = slot.get_8()
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character['equipment_category'] = slot.get_32()
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character['attack'] = slot.get_16()
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character['attack_id_reaction_unused'] = slot.get_8()
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character['unk1'] = slot.get_8()
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character['unk2'] = slot.get_8()
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character['unk3'] = slot.get_8()
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character['freelancer_strength'] = slot.get_8()
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character['freelancer_agility'] = slot.get_8()
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character['freelancer_stamina'] = slot.get_8()
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character['freelancer_magic'] = slot.get_8()
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character['freelancer_innates'] = slot.get_16()
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return character
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func get_save_slot(sram: File, slot_id: int):
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var buffer := StreamPeerBuffer.new()
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sram.seek(0x700 * slot_id)
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buffer.set_data_array(sram.get_buffer(0x700))
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return buffer
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func save_slot(sram: File, slot_id: int, slot: StreamPeerBuffer):
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sram.seek(0x700 * slot_id)
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sram.store_buffer(slot.data_array)
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sram.seek(0x1FF0 + (slot_id*2))
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sram.store_16(get_slot_checksum(slot))
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sram.seek(0x1FF8 + (slot_id*2))
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sram.store_16(SLOT_IN_USE)
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func delete_save_slot(sram: File, slot_id: int):
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sram.seek(0x1FF8 + (slot_id*2))
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sram.store_16(0)
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