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Corrected miscalculated CRC32 for headered NES ROMs

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This commit is contained in:
Kreeblah 2021-01-31 23:53:51 -08:00
parent c85e61c988
commit ebcaeee36b
1 changed files with 16 additions and 13 deletions
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29
Cart_Reader/NES.ino
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@ -16,13 +16,13 @@
//311 Setup
//340 Low Level Functions
//587 CRC Functions
//646 File Functions
//828 NES 2.0 Header Functions
//1109 Config Functions
//1705 ROM Functions
//2803 RAM Functions
//3232 Eeprom Functions
//3428 NESmaker Flash Cart Functions
//647 File Functions
//831 NES 2.0 Header Functions
//1112 Config Functions
//1708 ROM Functions
//2806 RAM Functions
//3235 Eeprom Functions
//3431 NESmaker Flash Cart Functions
/******************************************
Supported Mappers
@ -625,9 +625,10 @@ uint32_t crc32EEP(File &file, uint32_t &charcnt) {
return ~oldcrc32;
}
void calcCRC(char* checkFile, unsigned long filesize, uint32_t* crcCopy) {
void calcCRC(char* checkFile, unsigned long filesize, uint32_t* crcCopy, unsigned long offset) {
uint32_t crc;
crcFile = sd.open(checkFile);
crcFile.seek(offset);
if (filesize < 1024)
crc = crc32EEP(crcFile, filesize);
else
@ -732,6 +733,7 @@ void CreateRAMFileInSD() {
void outputNES() {
display_Clear();
char* outputFile;
unsigned long crcOffset = 0;
unsigned char* nes_header_bytes = getNESHeaderForFileInfo(1024 * prg, 1024 * chr, prg_crc32, chr_crc32);
@ -751,6 +753,7 @@ void outputNES() {
if(nes_header_bytes != NULL) {
outputFile = fileNES;
crcOffset = 16;
} else {
outputFile = fileBIN;
}
@ -806,7 +809,7 @@ void outputNES() {
println_Msg(F(""));
display_Update();
calcCRC(outputFile, (prg + chr) * 1024, NULL);
calcCRC(outputFile, (prg + chr) * 1024, NULL, crcOffset);
LED_RED_OFF;
LED_GREEN_OFF;
LED_BLUE_OFF;
@ -2237,7 +2240,7 @@ void readPRG() {
println_Msg(F(""));
display_Update();
calcCRC(fileName, prg * 1024, &prg_crc32);
calcCRC(fileName, prg * 1024, &prg_crc32, 0);
}
set_address(0);
PHI2_HI;
@ -2792,7 +2795,7 @@ void readCHR() {
println_Msg(F(""));
display_Update();
calcCRC(fileName, chr * 1024, &chr_crc32);
calcCRC(fileName, chr * 1024, &chr_crc32, 0);
}
}
set_address(0);
@ -2985,9 +2988,9 @@ void readRAM() {
display_Update();
if ((mapper == 16) || (mapper == 159))
calcCRC(fileName, eepsize, NULL);
calcCRC(fileName, eepsize, NULL, 0);
else
calcCRC(fileName, ram * 1024, NULL);
calcCRC(fileName, ram * 1024, NULL, 0);
}
}
set_address(0);