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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