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Implement checksumming in goke_p2pcam_param #59

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Implement checksumming in goke_p2pcam_param #59

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34 changes: 34 additions & 0 deletions source/goke_p2pcam_param.c
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,33 @@ void param_set_string(size_t offset, size_t size, char *data) {
free(buffer);
}

uint32_t checksum() {
uint32_t sum = 0;
uint16_t word;
FILE *file = fopen(filename, "r+b");
if(file == NULL) {
error(1, errno, "error: cannot open file: %s", filename);
}
fseek(file, 0xC, SEEK_SET);
while (!feof(file)) {
fread(&word, 2, 1, file);
sum+=word;
}
return sum;
}

void update_checksum() {
uint32_t sum;
FILE *file = fopen(filename, "r+b");
if(file == NULL) {
error(1, errno, "error: cannot open file: %s", filename);
}
fseek(file, 0x4, SEEK_SET);
sum = checksum();
fwrite(&sum, 4, 1, file);
}


int main(int argc, char *argv[]) {
int option = 0, option_index = 0, index = 0;

Expand Down Expand Up @@ -111,48 +138,55 @@ int main(int argc, char *argv[]) {
case 'n':
if(optarg) {
param_set_int(0xf6, 1, strtol(optarg, NULL, 0));
update_checksum();
} else {
param_get(0xf6, 1);
}
break;
case 'o':
if(optarg) {
param_set_int(0xf8, 1, strtol(optarg, NULL, 0));
update_checksum();
} else {
param_get(0xf8, 1);
}
break;
case 'q':
if(optarg) {
param_set_int(0xec, 1, strtol(optarg, NULL, 0));
update_checksum();
} else {
param_get(0xec, 1);
}
break;
case 'w':
if(optarg) {
param_set_string(0x128, 32, optarg);
update_checksum();
} else {
param_get_string(0x128, 32);
}
break;
case 'k':
if(optarg) {
param_set_string(0x154, 8, optarg);
update_checksum();
} else {
param_get_string(0x154, 8);
}
break;
case 'u':
if(optarg) {
param_set_string(0x1fc, 16, optarg);
update_checksum();
} else {
param_get_string(0x1fc, 16);
}
break;
case 'p':
if(optarg) {
param_set_string(0x20c, 16, optarg);
update_checksum();
} else {
param_get_string(0x20c, 16);
}
Expand Down