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cdromdrive: add support for raw CD images.

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This commit is contained in:
Maxim Poliakovski 2024-07-15 01:45:35 +02:00
parent fd5498e16b
commit f3d7cd9dd7
2 changed files with 30 additions and 2 deletions
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30
devices/storage/cdromdrive.cpp
View File

@ -30,12 +30,15 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
#include <cstring>
#include <string>
CdromDrive::CdromDrive() : BlockStorageDevice(31, 2048, 0xfffffffe) {
CdromDrive::CdromDrive() : BlockStorageDevice(31, CDR_STD_DATA_SIZE, 0xfffffffe) {
this->is_writeable = false;
}
void CdromDrive::insert_image(std::string filename) {
this->set_host_file(filename);
if (this->set_host_file(filename) < 0)
ABORT_F("Could not open CD-ROM image file, %s", filename.c_str());
this->detect_raw_image();
// create single track descriptor
this->tracks[0] = {1, /*.trk_num*/ 0x14, /*.adr_ctrl*/ 0 /*.start_lba*/};
@ -46,6 +49,29 @@ void CdromDrive::insert_image(std::string filename) {
static_cast<uint32_t>(this->size_blocks + 1) /*.start_lba*/};
}
bool CdromDrive::detect_raw_image() {
uint8_t block_hdr[16];
// let's see if the image data starts with the Mode 1/2 sync pattern
this->img_file.read(block_hdr, 0, sizeof(block_hdr));
for (int i = 1; i <= 10; i++)
if (block_hdr[i] != 0xFF)
return false;
if (block_hdr[0] != 0 || block_hdr[11] != 0)
return false;
// for now, we only support Mode 1 images
if (block_hdr[15] == 1) {
this->set_block_size(2352);
this->data_offset = 16;
return true;
}
return false;
}
static char cdrom_vendor_dingus_id[] = "DINGUS ";
static char cdrom_product_id[] = "DINGUS CD-ROM ";
static char cdrom_revision_id[] = "1.0 ";

2
devices/storage/cdromdrive.h
View File

@ -46,6 +46,7 @@ typedef struct {
#define CDROM_MAX_TRACKS 100
#define LEAD_OUT_TRK_NUM 0xAA
#define CDR_STD_DATA_SIZE 2048
class CdromDrive : public BlockStorageDevice {
public:
@ -71,6 +72,7 @@ protected:
std::function<void(uint8_t, uint8_t)> set_error;
uint8_t hex_to_bcd(const uint8_t val);
AddrMsf lba_to_msf(const int lba);
bool detect_raw_image();
TrackDescriptor tracks[CDROM_MAX_TRACKS];
int num_tracks;