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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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11
hooks.asm
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@@ -188,7 +188,7 @@ JSL.l AltBufferTable : NOP #8 ; Delete screen
;--------------------------------------------------------------------------------
org $0CCCCC ;<- 64CCC - Bank0C.asm : 1628 (JSL Intro_ValidateSram) / Bank02.asm : 75 (REP #$30)
; Explanation: In JP 1.0 the code for Intro_ValidateSram was inline in Bank 0C
JML.l Validate_SRAM ;(Return via RTL. Original code JML'd to Intro_LoadSpriteStats which returns with RTL, but we want to skip that)
JML.l ValidateSRAM ;(Return via RTL. Original code JML'd to Intro_LoadSpriteStats which returns with RTL, but we want to skip that)
org $0CCD57 ;<- 64D57 - Bank0C.asm :
RTL ;Just in case anybody ever removes the previous hook
;--------------------------------------------------------------------------------
@@ -299,12 +299,17 @@ BRA +
;================================================================================
; Extended SRAM Save file
;--------------------------------------------------------------------------------
org $0ccf08 ; <- Bank0C.asm : 2036 (LDA.w #$0007 : STA $7EC00D : STA $7EC013)
org $0CCF08 ; <- Bank0C.asm : 2036 (LDA.w #$0007 : STA $7EC00D : STA $7EC013)
JSL CopyExtendedSaveFileToWRAM
;--------------------------------------------------------------------------------
org $008998 ; <- Bank00.asm : 1296 (LDX.w #$0000)
JSL CopyExtendedWRAMSaveFileToSRAM
;--------------------------------------------------------------------------------
org $00899C ; <- bank_00.asm : #_00899C (CLC)
JSL WriteSaveChecksum
LDA.w #$01F3 : TCS : SEP #$30 : PLB : RTL ; Get the stack and data bank correct
padbyte $FF : pad $0089C2 ; Fill adjacent free rom forward. See bank_00.asm: #_0089C2
;--------------------------------------------------------------------------------
org $0CD7AB ; <- Bank0C.asm : 3342 (STA $700400, X)
JSL.l ClearExtendedSaveFile
;--------------------------------------------------------------------------------
@@ -2807,4 +2812,4 @@ if !FEATURE_NEW_TEXT
JSL RenderCharSetColorExtended_init
org $0EF285
JSL RenderCharSetColorExtended_close : NOP
endif
endif