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Use safer EEPROM save size check (#94)

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Pk11 2021-05-20 16:22:38 -05:00 committed by GitHub
parent fb7371de4a
commit 1708f51963
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1 changed files with 15 additions and 3 deletions
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18
arm9/source/dumpOperations.cpp
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@ -51,18 +51,30 @@ uint32 cardEepromGetSizeFixed() {
if(type == 1) if(type == 1)
return 512; return 512;
if(type == 2) { if(type == 2) {
u32 buf1,buf2,buf3 = 0x54536554; // "TeST" u32 buf1,buf2,buf3 = 0x54534554; // "TEST"
// Save the first word of the EEPROM // Save the first word of the EEPROM
cardReadEeprom(0,(u8*)&buf1,4,type); cardReadEeprom(0,(u8*)&buf1,4,type);
// Write "TeST" to it // Write "TEST" to it
cardWriteEeprom(0,(u8*)&buf3,4,type); cardWriteEeprom(0,(u8*)&buf3,4,type);
// Loop until the EEPROM mirrors and the first word shows up again // Loop until the EEPROM mirrors and the first word shows up again
int size = 8192; int size = 8192;
while (1) { while (1) {
cardReadEeprom(size,(u8*)&buf2,4,type); cardReadEeprom(size,(u8*)&buf2,4,type);
if ( buf2 == buf3 ) break; // Check if it matches, if so check again with another value to ensure no false positives
if (buf2 == buf3) {
u32 buf4 = 0x74736574; // "test"
// Write "test" to the first word
cardWriteEeprom(0,(u8*)&buf4,4,type);
// Check if it still matches
cardReadEeprom(size,(u8*)&buf2,4,type);
if (buf2 == buf4) break;
// False match, write "TEST" back and keep going
cardWriteEeprom(0,(u8*)&buf3,4,type);
}
size += 8192; size += 8192;
} }