alttpr-gwaa-kiwi/alttpr-baserom
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Compute checksum for extended SRAM

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Validate SRAM on file screen load and delete if checksum incorrect
This commit is contained in:
cassidoxa
2022-07-25 22:19:06 -04:00
parent 0e6e5d5b45
commit 10079a539b
3 changed files with 56 additions and 18 deletions
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13
sram.asm
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@@ -10,6 +10,7 @@
;--------------------------------------------------------------------------------
pushpc
org 0 ; This module writes no bytes. Asar gives bank cross errors without this.
SaveDataWRAM = $7EF000
;================================================================================
; Room Data ($7EF000 - $7EF27F
@@ -366,7 +367,7 @@ GTCollectedKeys: skip 1 ; / Ganon's Tower
skip 2 ; Reserved for previous table
FileMarker: skip 1 ; $FF = Active save file | $00 = Inactive save file
skip 13 ; Unused
InverseChecksum: skip 2 ; Vanilla Inverse Checksum. Don't write unless computing checksum.
InverseChecksumWRAM: skip 2 ; Vanilla Inverse Checksum. Don't write unless computing checksum.
;================================================================================
; Expanded SRAM ($7F6000 - $7F6FFF)
@@ -379,8 +380,7 @@ ExtendedFileNameWRAM: skip 24 ; File name, 12 word-length characters.
RoomPotData: skip 592 ; Table for expanded pot shuffle. One word per room.
SpritePotData: skip 592 ; Table for expanded pot shuffle. One word per room.
PurchaseCounts: skip 96 ; Keeps track of shop purchases
PrivateBlock: skip 512 ; Reserved for 3rd party developers
DummyValue: skip 1 ; $01 if you're a real dummy
PrivateBlock: skip 513 ; Reserved for 3rd party developers
;================================================================================
; Direct SRAM Assignments ($700000 - $7080000)
@@ -403,7 +403,8 @@ ProgressIndicatorSRAM: skip 1 ;
skip 19 ;
FileNameVanillaSRAM: skip 8 ; First four characters of file name
FileValiditySRAM: skip 2 ;
skip 285 ;
skip 283 ;
InverseChecksumSRAM: skip 2 ;
ExtendedFileNameSRAM: skip 24 ; We read and write the file name directly from and to SRAM (24 bytes)
skip $1AE4 ;
RomVersionSRAM: skip 4 ; ALTTPR ROM version. Low byte is the version, high byte writes
@@ -515,7 +516,7 @@ endmacro
%assertSRAM(FollowerDropped, $7EF3D3)
%assertSRAM(FileNameVanillaWRAM, $7EF3D9)
%assertSRAM(FileValidity, $7EF3E1)
%assertSRAM(InverseChecksum, $7EF4FE)
%assertSRAM(InverseChecksumWRAM, $7EF4FE)
;================================================================================
; Randomizer Assertions
@@ -640,7 +641,6 @@ endmacro
%assertSRAM(SpritePotData, $7F6268)
%assertSRAM(PurchaseCounts, $7F64B8)
%assertSRAM(PrivateBlock, $7F6518)
%assertSRAM(DummyValue, $7F6718)
;================================================================================
; Direct SRAM Assertions
@@ -654,6 +654,7 @@ endmacro
%assertSRAM(ProgressIndicatorSRAM, $7003C5)
%assertSRAM(FileNameVanillaSRAM, $7003D9)
%assertSRAM(FileValiditySRAM, $7003E1)
%assertSRAM(InverseChecksumSRAM, $7004FE)
%assertSRAM(ExtendedFileNameSRAM, $700500)
%assertSRAM(RomNameSRAM, $702000)
%assertSRAM(RomVersionSRAM, $701FFC)