mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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221 lines
8.7 KiB
C
221 lines
8.7 KiB
C
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "device_partition.h"
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int device_partition_read_data(device_partition_t *devpart, void *dst, uint64_t sector, uint64_t num_sectors)
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{
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int rc;
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if (!devpart->initialized) {
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rc = devpart->initializer(devpart);
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if (rc != 0) {
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return rc;
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}
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}
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if ((devpart->read_cipher != NULL) && (devpart->crypto_mode != DevicePartitionCryptoMode_None)) {
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for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
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uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
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rc = devpart->reader(devpart, devpart->crypto_work_buffer, sector + i, n);
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if (rc != 0) {
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return rc;
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}
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rc = devpart->read_cipher(devpart, sector + i, n);
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if (rc != 0) {
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return rc;
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}
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memcpy(dst + (size_t)(devpart->sector_size * i), devpart->crypto_work_buffer, (size_t)(devpart->sector_size * n));
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}
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return 0;
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} else {
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return devpart->reader(devpart, dst, sector, num_sectors);
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}
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}
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int device_partition_write_data(device_partition_t *devpart, const void *src, uint64_t sector, uint64_t num_sectors)
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{
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int rc;
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if (!devpart->initialized) {
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rc = devpart->initializer(devpart);
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if (rc != 0) {
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return rc;
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}
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}
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if ((devpart->write_cipher != NULL) && (devpart->crypto_mode != DevicePartitionCryptoMode_None)) {
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for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
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uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
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memcpy(devpart->crypto_work_buffer, src + (size_t)(devpart->sector_size * i), (size_t)(devpart->sector_size * n));
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rc = devpart->write_cipher(devpart, sector + i, n);
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if (rc != 0) {
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return rc;
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}
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rc = devpart->writer(devpart, devpart->crypto_work_buffer, sector + i, n);
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if (rc != 0) {
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return rc;
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}
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}
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return 0;
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} else {
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return devpart->writer(devpart, src, sector, num_sectors);
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}
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}
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int emu_device_partition_read_data(device_partition_t *devpart, void *dst, uint64_t sector, uint64_t num_sectors, const char *origin_path, int num_parts, uint64_t part_limit)
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{
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int rc = 0;
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uint64_t target_sector = sector;
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char target_path[0x300 + 1] = {0};
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/* Perform initialization steps, if necessary. */
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if (!devpart->initialized) {
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rc = devpart->initializer(devpart);
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if (rc != 0) {
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return rc;
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}
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}
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/* Prepare the right file path if using file mode. */
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if (devpart->emu_use_file && (origin_path != NULL)) {
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/* Handle data in multiple parts, if necessary. */
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if (num_parts > 0) {
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int target_part = 0;
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uint64_t data_offset = sector * devpart->sector_size;
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if (data_offset >= part_limit) {
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uint64_t data_offset_aligned = (data_offset + (part_limit - 1)) & ~(part_limit - 1);
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target_part = (data_offset_aligned == data_offset) ? (data_offset / part_limit) : (data_offset_aligned / part_limit) - 1;
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target_sector = (data_offset - (target_part * part_limit)) / devpart->sector_size;
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/* Target part is invalid. */
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if (target_part > num_parts) {
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return -1;
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}
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}
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/* Treat the path as a folder with each part inside. */
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snprintf(target_path, sizeof(target_path) - 1, "%s/%02d", origin_path, target_part);
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} else {
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/* If there are no parts, copy the origin path directly. */
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strcpy(target_path, origin_path);
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}
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/* Update the target file path. */
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devpart->emu_file_path = target_path;
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}
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/* Read the partition data. */
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if ((devpart->read_cipher != NULL) && (devpart->crypto_mode != DevicePartitionCryptoMode_None)) {
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for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
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uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
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/* Read partition data. */
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rc = devpart->reader(devpart, devpart->crypto_work_buffer, target_sector + i, n);
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if (rc != 0) {
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return rc;
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}
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/* Decrypt partition data. */
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rc = devpart->read_cipher(devpart, target_sector + i, n);
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if (rc != 0) {
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return rc;
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}
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/* Copy partition data to destination. */
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memcpy(dst + (size_t)(devpart->sector_size * i), devpart->crypto_work_buffer, (size_t)(devpart->sector_size * n));
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}
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} else {
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/* Read partition data. */
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rc = devpart->reader(devpart, dst, target_sector, num_sectors);
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}
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return rc;
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}
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int emu_device_partition_write_data(device_partition_t *devpart, const void *src, uint64_t sector, uint64_t num_sectors, const char *origin_path, int num_parts, uint64_t part_limit)
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{
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int rc = 0;
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uint64_t target_sector = sector;
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char target_path[0x300 + 1] = {0};
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/* Perform initialization steps, if necessary. */
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if (!devpart->initialized) {
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rc = devpart->initializer(devpart);
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if (rc != 0) {
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return rc;
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}
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}
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/* Prepare the right file path if using file mode. */
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if (devpart->emu_use_file && (origin_path != NULL)) {
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/* Handle data in multiple parts, if necessary. */
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if (num_parts > 0) {
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int target_part = 0;
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uint64_t data_offset = sector * devpart->sector_size;
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if (data_offset >= part_limit) {
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uint64_t data_offset_aligned = (data_offset + (part_limit - 1)) & ~(part_limit - 1);
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target_part = (data_offset_aligned == data_offset) ? (data_offset / part_limit) : (data_offset_aligned / part_limit) - 1;
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target_sector = (data_offset - (target_part * part_limit)) / devpart->sector_size;
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/* Target part is invalid. */
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if (target_part > num_parts) {
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return -1;
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}
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}
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/* Treat the path as a folder with each part inside. */
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snprintf(target_path, sizeof(target_path) - 1, "%s/%02d", origin_path, target_part);
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} else {
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/* If there are no parts, copy the origin path directly. */
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strcpy(target_path, origin_path);
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}
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/* Update the target file path. */
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devpart->emu_file_path = target_path;
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}
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/* Write the partition data. */
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if ((devpart->write_cipher != NULL) && (devpart->crypto_mode != DevicePartitionCryptoMode_None)) {
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for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
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uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
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/* Copy partition data from source. */
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memcpy(devpart->crypto_work_buffer, src + (size_t)(devpart->sector_size * i), (size_t)(devpart->sector_size * n));
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/* Encrypt data. */
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rc = devpart->write_cipher(devpart, target_sector + i, n);
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if (rc != 0) {
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return rc;
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}
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/* Write partition data. */
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rc = devpart->writer(devpart, devpart->crypto_work_buffer, target_sector + i, n);
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if (rc != 0) {
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return rc;
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}
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}
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} else {
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/* Write partition data. */
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rc = devpart->writer(devpart, src, target_sector, num_sectors);
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}
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return rc;
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}
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