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Permitted ROM-style PRGs that are not a power-of-two in size, and added extra safety checks on loading data from a tape.

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This commit is contained in:
Thomas Harte 2017-05-08 22:15:35 -04:00
parent cb66c7e2dc
commit 5d91a2600d
2 changed files with 10 additions and 9 deletions
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7
Machines/Commodore/Vic-20/Vic20.cpp
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@ -147,10 +147,13 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
// perform a via-processor_write_memory_map_ memcpy
uint8_t *data_ptr = data->data.data();
while(start_address != end_address) {
processor_write_memory_map_[start_address >> 10][start_address & 0x3ff] = *data_ptr;
size_t data_left = data->data.size();
while(data_left && start_address != end_address) {
uint8_t *page = processor_write_memory_map_[start_address >> 10];
if(page) page[start_address & 0x3ff] = *data_ptr;
data_ptr++;
start_address++;
data_left--;
}
// set tape status, carry and flag

12
Storage/Cartridge/Formats/PRG.cpp
View File

@ -18,12 +18,8 @@ PRG::PRG(const char *file_name) {
struct stat file_stats;
stat(file_name, &file_stats);
// accept only files sized 1, 2, 4 or 8kb
if(
file_stats.st_size != 0x400 + 2 &&
file_stats.st_size != 0x800 + 2 &&
file_stats.st_size != 0x1000 + 2 &&
file_stats.st_size != 0x2000 + 2)
// accept only files sized less than 8kb
if(file_stats.st_size > 0x2000 + 2)
throw ErrorNotROM;
// get the loading address, and the rest of the contents
@ -33,7 +29,9 @@ PRG::PRG(const char *file_name) {
loading_address |= fgetc(file) << 8;
size_t data_length = (size_t)file_stats.st_size - 2;
std::vector<uint8_t> contents(data_length);
size_t padded_data_length = 1;
while(padded_data_length < data_length) padded_data_length <<= 1;
std::vector<uint8_t> contents(padded_data_length);
fread(&contents[0], 1, (size_t)(data_length), file);
fclose(file);