mirror of
https://github.com/dingusdev/dingusppc.git
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d4c9db7fcf
Allows different implementations for different platforms (the JS build relies on browser APIs to stream disk images over the network). Setting aside the JS build, this also reduces some code duplication.
103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 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 Block storage device implementation. */
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#include <devices/storage/blockstoragedevice.h>
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using namespace std;
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BlockStorageDevice::BlockStorageDevice(const uint32_t cache_blocks, const uint32_t block_size) {
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this->block_size = block_size;
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this->cache_size = cache_blocks * this->block_size;
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// allocate device cache and fill it with zeroes
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this->data_cache = std::unique_ptr<char[]>(new char[this->cache_size] ());
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}
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BlockStorageDevice::~BlockStorageDevice() {
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this->img_file.close();
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}
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int BlockStorageDevice::set_host_file(std::string file_path) {
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this->is_ready = false;
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if (!this->img_file.open(file_path)) {
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return -1;
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}
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this->size_bytes = this->img_file.size();
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this->size_blocks = this->size_bytes / this->block_size;
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this->set_fpos(0);
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this->is_ready = true;
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return 0;
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}
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int BlockStorageDevice::set_fpos(const uint32_t lba) {
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this->cur_fpos = lba * this->block_size;
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return 0;
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}
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int BlockStorageDevice::read_begin(int nblocks, uint32_t max_len) {
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uint32_t xfer_len = std::min(this->cache_size, max_len);
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uint32_t read_size = nblocks * this->block_size;
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if (read_size > xfer_len) {
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this->remain_size = read_size - xfer_len;
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read_size = xfer_len;
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} else {
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this->remain_size = 0;
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}
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this->img_file.read(this->data_cache.get(), this->cur_fpos, read_size);
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this->cur_fpos += read_size;
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return read_size;
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}
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int BlockStorageDevice::read_more() {
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uint32_t read_size;
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if (!this->remain_size)
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return 0;
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if (this->remain_size > this->cache_size) {
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this->remain_size -= this->cache_size;
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read_size = this->cache_size;
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} else {
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read_size = this->remain_size;
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this->remain_size = 0;
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}
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this->img_file.read(this->data_cache.get(), this->cur_fpos, read_size);
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this->cur_fpos += read_size;
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return read_size;
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}
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int BlockStorageDevice::write_begin(char *buf, int nblocks) {
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if (!this->is_writeable)
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return -1;
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return 0;
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}
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