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Guess low-level floppy disk format based on image size.
Also add fdd_fmt property for manually specifying disk format.
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@ -21,7 +21,8 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
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/** @file Support for reading and writing of various floppy images. */
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#include "floppyimg.h"
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#include <devices/floppy/floppyimg.h>
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#include <machines/machineproperties.h>
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#include <loguru.hpp>
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#include <memaccess.h>
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@ -67,27 +68,14 @@ static FlopImgType identify_image(std::ifstream& img_file)
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return FlopImgType::UNKNOWN;
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}
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static int64_t get_hfs_vol_size(const uint8_t *mdb_data)
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{
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uint16_t drNmAlBlks = READ_WORD_BE_A(&mdb_data[18]);
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uint32_t drAlBlkSiz = READ_DWORD_BE_A(&mdb_data[20]);
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// calculate size of the volume bitmap
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uint32_t vol_bmp_size = (((drNmAlBlks + 8) >> 3) + 512) & 0xFFFFFE00UL;
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return (drNmAlBlks * drAlBlkSiz + vol_bmp_size + 3*BLOCK_SIZE);
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}
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//======================= RAW IMAGE CONVERTER ============================
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RawFloppyImg::RawFloppyImg(std::string& file_path) : FloppyImgConverter()
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{
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this->img_path = file_path;
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}
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/** For raw images, we're going to ensure that the data fits into
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one of the supported floppy disk sizes as well as image size
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matches the size of the embedded HFS/MFS volume.
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Then we'll attempt to guess disk format based on image size.
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/**
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For raw images, we'll attempt to guess disk format based on image size.
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*/
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int RawFloppyImg::calc_phys_params()
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{
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@ -118,34 +106,25 @@ int RawFloppyImg::calc_phys_params()
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return -1;
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}
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// read Master Directory Block from logical block 2
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uint8_t buf[512] = { 0 };
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img_file.seekg(2*BLOCK_SIZE, img_file.beg);
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img_file.read((char *)buf, sizeof(buf));
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img_file.close();
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uint64_t vol_size = 0;
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if (buf[0] == 0x42 && buf[1] == 0x44) {
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// check HFS volume size
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vol_size = get_hfs_vol_size(buf);
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} else if (buf[0] == 0xD2 && buf[1] == 0xD7) {
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// check MFS volume size
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} else {
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LOG_F(ERROR, "RawFloppyImg: unknown volume type!");
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return -1;
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}
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if (vol_size > this->img_size) {
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LOG_F(INFO, "RawFloppyImg: volume size > image size!");
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LOG_F(INFO, "Volume size: %llu, Image size: %d", vol_size, this->img_size);
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return -1;
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}
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// raw images don't include anything than raw disk data
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// raw images don't include anything other than raw disk data
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this->data_size = this->img_size;
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// see if user has specified disk format manually
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std::string fmt = GET_STR_PROP("fdd_fmt");
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if (!fmt.empty()) {
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if (fmt == "GCR_400K") {
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this->img_size = 409600;
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} else if (fmt == "GCR_800K") {
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this->img_size = 819200;
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} else if (fmt == "MFM_720K") {
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this->img_size = 737280;
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} else if (fmt == "MFM_1440K") {
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this->img_size = 1474560;
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} else {
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LOG_F(WARNING, "Invalid floppy disk format %s", fmt.c_str());
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}
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}
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// guess disk format from image file size
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static struct {
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int capacity;
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@ -33,6 +33,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include <cinttypes>
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#include <memory>
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#include <string>
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#include <vector>
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using namespace Swim3;
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@ -335,11 +336,19 @@ void Swim3Ctrl::stop_disk_access()
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this->access_timer_id = 0;
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}
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// floppy disk formats properties for the cases
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// where disk format needs to be specified manually
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static const std::vector<std::string> FloppyFormats = {
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"", "GCR_400K", "GCR_800K", "MFM_720K", "MFM_1440K"
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};
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static const PropMap Swim3_Properties = {
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{"fdd_img",
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new StrProperty("")},
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{"fdd_wr_prot",
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new BinProperty(0)},
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{"fdd_fmt",
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new StrProperty("", FloppyFormats)},
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};
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static const DeviceDescription Swim3_Descriptor = {
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@ -77,6 +77,7 @@ static const map<string, string> PropHelp = {
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{"rambank4_size", "specifies RAM bank 4 size in MB"},
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{"gfxmem_size", "specifies video memory size in MB"},
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{"fdd_img", "specifies path to floppy disk image"},
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{"fdd_fmt", "specifies floppy disk format"},
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{"fdd_wr_prot", "toggles floppy disk's write protection"},
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{"mon_id", "specifies which monitor to emulate"},
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{"pci_A1", "insert a PCI device into A1 slot"},
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