mirror of
https://github.com/dingusdev/dingusppc.git
synced 2024-12-27 00:29:18 +00:00
3978d0754d
The code does not support more than 2^32 - 2 blocks because of this expression: static_cast<uint32_t>(this->size_blocks + 1)
107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
/*
|
|
DingusPPC - The Experimental PowerPC Macintosh emulator
|
|
Copyright (C) 2018-23 divingkatae and maximum
|
|
(theweirdo) spatium
|
|
|
|
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file Block storage device implementation. */
|
|
|
|
#include <devices/storage/blockstoragedevice.h>
|
|
|
|
using namespace std;
|
|
|
|
BlockStorageDevice::BlockStorageDevice(const uint32_t cache_blocks, const uint32_t block_size, const uint64_t max_blocks) {
|
|
this->block_size = block_size;
|
|
this->cache_size = cache_blocks * this->block_size;
|
|
this->max_blocks = max_blocks;
|
|
|
|
// allocate device cache and fill it with zeroes
|
|
this->data_cache = std::unique_ptr<char[]>(new char[this->cache_size] ());
|
|
}
|
|
|
|
BlockStorageDevice::~BlockStorageDevice() {
|
|
this->img_file.close();
|
|
}
|
|
|
|
int BlockStorageDevice::set_host_file(std::string file_path) {
|
|
this->is_ready = false;
|
|
|
|
if (!this->img_file.open(file_path)) {
|
|
return -1;
|
|
}
|
|
|
|
this->size_bytes = this->img_file.size();
|
|
this->size_blocks = this->size_bytes / this->block_size;
|
|
if (this->size_blocks > this->max_blocks)
|
|
return -1;
|
|
|
|
this->set_fpos(0);
|
|
|
|
this->is_ready = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int BlockStorageDevice::set_fpos(const uint32_t lba) {
|
|
this->cur_fpos = lba * this->block_size;
|
|
return 0;
|
|
}
|
|
|
|
int BlockStorageDevice::read_begin(int nblocks, uint32_t max_len) {
|
|
uint32_t xfer_len = std::min(this->cache_size, max_len);
|
|
uint32_t read_size = nblocks * this->block_size;
|
|
if (read_size > xfer_len) {
|
|
this->remain_size = read_size - xfer_len;
|
|
read_size = xfer_len;
|
|
} else {
|
|
this->remain_size = 0;
|
|
}
|
|
|
|
this->img_file.read(this->data_cache.get(), this->cur_fpos, read_size);
|
|
this->cur_fpos += read_size;
|
|
|
|
return read_size;
|
|
}
|
|
|
|
int BlockStorageDevice::read_more() {
|
|
uint32_t read_size;
|
|
|
|
if (!this->remain_size)
|
|
return 0;
|
|
|
|
if (this->remain_size > this->cache_size) {
|
|
this->remain_size -= this->cache_size;
|
|
read_size = this->cache_size;
|
|
} else {
|
|
read_size = this->remain_size;
|
|
this->remain_size = 0;
|
|
}
|
|
|
|
this->img_file.read(this->data_cache.get(), this->cur_fpos, read_size);
|
|
this->cur_fpos += read_size;
|
|
|
|
return read_size;
|
|
}
|
|
|
|
int BlockStorageDevice::write_begin(char *buf, int nblocks) {
|
|
if (!this->is_writeable)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|