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nscsi/cd.cpp: Fix some Coverity warnings in the nscsi_apple_cdrom_device. [R. Belmont]

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This commit is contained in:
arbee 2023-08-25 23:35:06 -04:00
parent 4f10818b9b
commit b598b7c1cc
1 changed files with 24 additions and 9 deletions
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21
src/devices/bus/nscsi/cd.cpp Normal file → Executable file
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@ -952,9 +952,9 @@ void nscsi_cdrom_apple_device::scsi_command()
scsi_cmdbuf[2] = 0x01;
scsi_cmdbuf[3] = 0x01;
scsi_cmdbuf[4] = 0x31; // additional length
strncpy((char *)&scsi_cmdbuf[8], "SONY ", 8);
strncpy((char *)&scsi_cmdbuf[16], "CD-ROM CDU-8002 ", 16);
strncpy((char *)&scsi_cmdbuf[32], "1.8g", 4);
memcpy((char *)&scsi_cmdbuf[8], "SONY ", 8);
memcpy((char *)&scsi_cmdbuf[16], "CD-ROM CDU-8002 ", 16);
memcpy((char *)&scsi_cmdbuf[32], "1.8g", 4);
scsi_cmdbuf[39] = 0xd0;
scsi_cmdbuf[40] = 0x90;
scsi_cmdbuf[41] = 0x27;
@ -995,6 +995,10 @@ void nscsi_cdrom_apple_device::scsi_command()
int pos = 0;
for (int trk = 0; trk < num_trks; trk++)
{
// Coverity: The emulated program could conceivably request a buffer size for
// more tracks than exist, but we must still return the requested amount of data.
if ((trk + start_track) < image->get_last_track())
{
const uint32_t start_lba = image->get_track_start(trk + start_track);
const uint32_t start_frame = to_msf(start_lba);
@ -1004,6 +1008,17 @@ void nscsi_cdrom_apple_device::scsi_command()
scsi_cmdbuf[pos++] = dec_2_bcd(BIT(start_frame, 8, 8)); // seconds
scsi_cmdbuf[pos++] = dec_2_bcd(BIT(start_frame, 0, 8)); // frames
}
else // keep returning the last track if necessary
{
const uint32_t start_lba = image->get_track_start(image->get_last_track());
const uint32_t start_frame = to_msf(start_lba);
scsi_cmdbuf[pos++] = image->get_adr_control(image->get_last_track());
scsi_cmdbuf[pos++] = dec_2_bcd(BIT(start_frame, 16, 8)); // minutes
scsi_cmdbuf[pos++] = dec_2_bcd(BIT(start_frame, 8, 8)); // seconds
scsi_cmdbuf[pos++] = dec_2_bcd(BIT(start_frame, 0, 8)); // frames
}
}
scsi_data_in(SBUF_MAIN, pos);
scsi_status_complete(SS_GOOD);