mirror of
https://github.com/dingusdev/dingusppc.git
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259 lines
7.5 KiB
C++
259 lines
7.5 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-21 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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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 Support for reading and writing of various floppy images. */
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#include "floppyimg.h"
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#include <loguru.hpp>
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#include <memaccess.h>
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#include <cinttypes>
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#include <cstring>
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#include <fstream>
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#include <string>
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static FlopImgType identify_image(std::ifstream& img_file)
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{
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// WOZ images identification strings
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static uint8_t WOZ1_SIG[] = {0x57, 0x4F, 0x5A, 0x31, 0xFF, 0x0A, 0x0D, 0x0A};
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static uint8_t WOZ2_SIG[] = {0x57, 0x4F, 0x5A, 0x32, 0xFF, 0x0A, 0x0D, 0x0A};
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uint8_t buf[8] = { 0 };
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img_file.seekg(0, std::ios::beg);
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img_file.read((char *)buf, sizeof(buf));
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// WOZ files are easily identified
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if (!std::memcmp(buf, WOZ1_SIG, sizeof(buf))) {
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return FlopImgType::WOZ1;
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} else if (!std::memcmp(buf, WOZ2_SIG, sizeof(buf))) {
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return FlopImgType::WOZ2;
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} else {
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for (int offset = 0; offset <=84; offset += 84) {
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// rewind to logical block 2
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img_file.seekg(2*BLOCK_SIZE + offset, std::ios::beg);
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img_file.read((char *)buf, sizeof(buf));
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// check for HFS/MFS signature at the start of the logical block 2
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if ((buf[0] == 0x42 && buf[1] == 0x44) ||
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(buf[0] == 0xD2 && buf[1] == 0xD7)) {
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if (offset) {
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return FlopImgType::DC42;
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} else {
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return FlopImgType::RAW;
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}
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}
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}
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}
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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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int RawFloppyImg::calc_phys_params()
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{
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std::ifstream img_file;
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img_file.open(img_path, std::ios::in | std::ios::binary);
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if (img_file.fail()) {
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img_file.close();
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LOG_F(ERROR, "RawFloppyImg: Could not open specified floppy image!");
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return -1;
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}
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// determine image size
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img_file.seekg(0, img_file.end);
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this->img_size = img_file.tellg();
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img_file.seekg(0, img_file.beg);
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// verify image size
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if (this->img_size < 5*BLOCK_SIZE) {
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img_file.close();
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LOG_F(ERROR, "RawFloppyImg: image too short!");
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return -1;
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}
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if (this->img_size > MFM_HD_SIZE) {
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img_file.close();
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LOG_F(ERROR, "RawFloppyImg: image too big!");
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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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this->data_size = this->img_size;
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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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int rec_method;
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int num_tracks;
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int num_sectors;
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int num_sides;
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int density;
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} size_to_params[] = {
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{ 409600, 0, 80, 800, 1, 0}, // 400K GCR
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{ 819200, 0, 80, 800, 2, 0}, // 800K GCR
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{ 737280, 1, 80, 1440, 2, 0}, // 720K MFM
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{1474560, 1, 80, 2880, 2, 1}, // 1440K MFM
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};
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this->rec_method = -1;
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for (int i = 0; i < 4; i++) {
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if (this->img_size == size_to_params[i].capacity) {
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this->rec_method = size_to_params[i].rec_method;
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this->num_tracks = size_to_params[i].num_tracks;
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this->num_sectors = size_to_params[i].num_sectors;
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this->num_sides = size_to_params[i].num_sides;
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this->density = size_to_params[i].density;
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// fake format byte for GCR disks
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if (!this->rec_method) {
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this->format_byte = (this->num_sides == 2) ? 0x22 : 0x2;
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} else {
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// For MFM disks this byte indicates sector size in blocks
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this->format_byte = 2;
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}
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break;
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}
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}
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if (this->rec_method == -1) {
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LOG_F(ERROR, "RawFloppyImg: could't determine disk format from image size!");
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return -1;
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}
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return 0;
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}
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/** Retrieve raw disk data. */
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int RawFloppyImg::get_raw_disk_data(char* buf)
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{
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std::ifstream img_file;
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img_file.open(img_path, std::ios::in | std::ios::binary);
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if (img_file.fail()) {
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img_file.close();
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LOG_F(ERROR, "RawFloppyImg: Could not open specified floppy image!");
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return -1;
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}
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img_file.seekg(0, img_file.beg);
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img_file.read(buf, this->data_size);
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img_file.close();
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return 0;
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}
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/** Convert low-level disk data to high-level image data. */
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int RawFloppyImg::export_data()
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{
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return 0;
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}
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FloppyImgConverter* open_floppy_image(std::string& img_path)
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{
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FloppyImgConverter *fconv;
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std::ifstream img_file;
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img_file.open(img_path, std::ios::in | std::ios::binary);
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if (img_file.fail()) {
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img_file.close();
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LOG_F(ERROR, "Could not open specified floppy image!");
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return nullptr;
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}
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FlopImgType itype = identify_image(img_file);
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img_file.close();
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switch(itype) {
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case FlopImgType::RAW:
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LOG_F(INFO, "Raw floppy image");
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fconv = new RawFloppyImg(img_path);
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break;
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case FlopImgType::DC42:
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LOG_F(INFO, "Disk Copy 4.2 image");
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break;
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case FlopImgType::WOZ1:
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case FlopImgType::WOZ2:
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LOG_F(INFO, "WOZ v%s image\n", (itype == FlopImgType::WOZ2) ? "2" : "1");
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break;
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default:
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LOG_F(ERROR, "Unknown/unsupported image format!");
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return nullptr;
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}
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if (fconv->calc_phys_params()) {
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delete fconv;
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return nullptr;
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}
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return fconv;
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}
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