mirror of
https://github.com/dingusdev/dingusppc.git
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fd5498e16b
Raw images contain supplementary information like synchronization fields, correction codes etc. that needs to be ignored/discarded when reading/writing user data. This commit establish a basic architecture for exchanging user data between a virtual device and a raw image.
141 lines
3.9 KiB
C++
141 lines
3.9 KiB
C++
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-24 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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#include <cstring>
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using namespace std;
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BlockStorageDevice::BlockStorageDevice(const uint32_t cache_blocks,
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const uint32_t block_size,
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const uint64_t max_blocks) {
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this->block_size = block_size;
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this->raw_blk_size = block_size;
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this->cache_blocks = cache_blocks;
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this->max_blocks = max_blocks;
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this->is_ready = false;
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this->cache_size = 0;
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this->data_offset = 0;
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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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this->size_bytes = this->img_file.size();
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this->set_fpos(0);
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this->is_ready = true;
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return this->set_block_size(this->block_size);
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}
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int BlockStorageDevice::set_block_size(const int blk_size) {
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this->raw_blk_size = blk_size;
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if (this->is_ready) {
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this->size_blocks = this->size_bytes / this->raw_blk_size;
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if (this->size_blocks > this->max_blocks)
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return -1;
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}
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this->cache_size = this->cache_blocks * this->raw_blk_size;
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// allocate data 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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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->raw_blk_size;
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return 0;
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}
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void BlockStorageDevice::fill_cache(const int nblocks) {
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uint32_t read_size = nblocks * this->raw_blk_size;
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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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// extract block data from raw images while discarding anything else
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if (this->raw_blk_size > this->block_size) {
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char *cache_ptr = this->data_cache.get();
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for (int blk = 0; blk < nblocks; blk++) {
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memcpy(cache_ptr + blk * this->block_size,
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cache_ptr + blk * this->raw_blk_size + this->data_offset,
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this->block_size
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);
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}
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}
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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_blocks * this->block_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->fill_cache(read_size / this->block_size);
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return read_size;
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}
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int BlockStorageDevice::read_more() {
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if (!this->remain_size)
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return 0;
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uint32_t read_size = this->cache_blocks * this->block_size;
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if (this->remain_size > read_size) {
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this->remain_size -= read_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->fill_cache(read_size / this->block_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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