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Maple: Corrected creation of empty VMU 

The VMU which was written to disk was never initialized and therefore consisted only of zeroes.
After saving for the first time the VMU was corrupted.

Changes:
* Not only initialize the VMU in memory but also write the correct contents to disk
* If an existing VMU consists only of zeroes overwrite it with the initial empty VMU
This commit is contained in:
Christoph "baka0815" Schwerdtfeger 2018-08-27 13:50:59 +02:00
parent 2703c6574e
commit bc873cb228
1 changed files with 75 additions and 43 deletions
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46
core/hw/maple/maple_devs.cpp
View File

@ -272,6 +272,20 @@ struct maple_sega_vmu: maple_base
u8 lcd_data[192];
u8 lcd_data_decoded[48*32];
// creates an empty VMU
bool init_emptyvmu()
{
printf("Initialising empty VMU...\n");
uLongf dec_sz = sizeof(flash_data);
int rv = uncompress(flash_data, &dec_sz, vmu_default, sizeof(vmu_default));
verify(rv == Z_OK);
verify(dec_sz == sizeof(flash_data));
return (rv == Z_OK && dec_sz == sizeof(flash_data));
}
virtual void OnSetup()
{
memset(flash_data, 0, sizeof(flash_data));
@ -286,10 +300,15 @@ struct maple_sega_vmu: maple_base
printf("Unable to open VMU save file \"%s\", creating new file\n",apath.c_str());
file = fopen(apath.c_str(), "wb");
if (file) {
if (!init_emptyvmu())
printf("Failed to initialize an empty VMU, you should reformat it using the BIOS\n");
fwrite(flash_data, sizeof(flash_data), 1, file);
fseek(file, 0, SEEK_SET);
} else {
printf("Unable to create vmu\n");
}
else
{
printf("Unable to create VMU!\n");
}
}
@ -307,12 +326,25 @@ struct maple_sega_vmu: maple_base
sum |= flash_data[i];
if (sum == 0) {
printf("Initialising empty vmu...\n");
uLongf dec_sz = sizeof(flash_data);
int rv=uncompress(flash_data, &dec_sz, vmu_default, sizeof(vmu_default));
// This means the existing VMU file is completely empty and needs to be recreated
verify(rv == Z_OK);
verify(dec_sz == sizeof(flash_data));
if (init_emptyvmu())
{
if (!file)
file = fopen(apath.c_str(), "wb");
if (file) {
fwrite(flash_data, sizeof(flash_data), 1, file);
fseek(file, 0, SEEK_SET);
}
else {
printf("Unable to create VMU!\n");
}
}
else
{
printf("Failed to initialize an empty VMU, you should reformat it using the BIOS\n");
}
}
}