mirror of
https://github.com/dingusdev/dingusppc.git
synced 2026-10-25 17:02:23 +00:00
Maxim Poliakovski
958bd0f8e6
This source should contain anything related to the physical properties of a CD/DVD drive like mechanical capabilities, formats supported as well as handling of the underlying images.
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-26 The DingusPPC Development Team
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(See CREDITS.MD for more details)
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(You may also contact divingkxt or powermax2286 on Discord)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Virtual CD-ROM device implementation. */
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#include <devices/storage/cdromdrive.h>
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#include <loguru.hpp>
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#include <cinttypes>
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#include <cstring>
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#include <string>
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CdromDrive::CdromDrive() : BlockStorageDevice(31, CDR_STD_DATA_SIZE, 0xfffffffe) {
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this->is_writeable = false;
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}
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void CdromDrive::insert_image(std::string filename) {
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if (this->set_host_file(filename) < 0)
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ABORT_F("Could not open CD-ROM image file, %s", filename.c_str());
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this->detect_raw_image();
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// create single track descriptor
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this->tracks[0] = {1, /*.trk_num*/ 0x14, /*.adr_ctrl*/ 0 /*.start_lba*/};
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this->num_tracks = 1;
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// create Lead-out descriptor containing all data
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this->tracks[1] = {LEAD_OUT_TRK_NUM, /*.trk_num*/ 0x14, /*.adr_ctrl*/
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static_cast<uint32_t>(this->size_blocks + 1) /*.start_lba*/};
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}
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bool CdromDrive::detect_raw_image() {
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uint8_t block_hdr[16];
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// let's see if the image data starts with the Mode 1/2 sync pattern
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this->img_file.read(block_hdr, 0, sizeof(block_hdr));
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for (int i = 1; i <= 10; i++)
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if (block_hdr[i] != 0xFF)
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return false;
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if (block_hdr[0] != 0 || block_hdr[11] != 0)
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return false;
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// for now, we only support Mode 1 images
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if (block_hdr[15] == 1) {
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this->set_block_size(2352);
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this->data_offset = 16;
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return true;
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}
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return false;
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}
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uint8_t CdromDrive::hex_to_bcd(const uint8_t val) {
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uint8_t hi = val / 10;
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uint8_t lo = val % 10;
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return (hi << 4) | lo;
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}
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AddrMsf CdromDrive::lba_to_msf(const int lba) {
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return {hex_to_bcd( lba / 4500), /*.min*/
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hex_to_bcd((lba / 75) % 60), /*.sec*/
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hex_to_bcd( lba % 75) /*.frm*/
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};
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}
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