mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-12-31 00:20:51 +01:00
286 lines
9.3 KiB
C++
286 lines
9.3 KiB
C++
// Copyright 2009 Dolphin Emulator Project
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
/* mksdcard.c
|
|
**
|
|
** Copyright 2007, The Android Open Source Project
|
|
**
|
|
** Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in the
|
|
** documentation and/or other materials provided with the distribution.
|
|
** * Neither the name of Google Inc. nor the names of its contributors may
|
|
** be used to endorse or promote products derived from this software
|
|
** without specific prior written permission.
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
|
|
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
// A simple and portable piece of code used to generate a blank FAT32 image file.
|
|
// Modified for Dolphin.
|
|
|
|
#include "Common/SDCardUtil.h"
|
|
|
|
#include <algorithm>
|
|
#include <cstddef>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
#include <ctime>
|
|
#include <string>
|
|
|
|
#include "Common/CommonFuncs.h"
|
|
#include "Common/CommonTypes.h"
|
|
#include "Common/IOFile.h"
|
|
#include "Common/Logging/Log.h"
|
|
|
|
#ifndef _WIN32
|
|
#include <unistd.h> // for unlink()
|
|
#endif
|
|
|
|
namespace Common
|
|
{
|
|
// Believe me, you *don't* want to change these constants !!
|
|
enum : u32
|
|
{
|
|
BYTES_PER_SECTOR = 512,
|
|
RESERVED_SECTORS = 32,
|
|
BACKUP_BOOT_SECTOR = 6,
|
|
NUM_FATS = 2
|
|
};
|
|
|
|
static u8 s_boot_sector[BYTES_PER_SECTOR]; /* Boot sector */
|
|
static u8 s_fsinfo_sector[BYTES_PER_SECTOR]; /* FS Info sector */
|
|
static u8 s_fat_head[BYTES_PER_SECTOR]; /* First FAT sector */
|
|
|
|
template <typename T>
|
|
static void WriteData(u8* out, T data)
|
|
{
|
|
std::memcpy(out, &data, sizeof(data));
|
|
}
|
|
|
|
/* This is the date and time when creating the disk */
|
|
static unsigned int get_serial_id()
|
|
{
|
|
const time_t now = std::time(nullptr);
|
|
const struct tm tm = std::gmtime(&now)[0];
|
|
|
|
const u16 lo = static_cast<u16>(tm.tm_mday + ((tm.tm_mon + 1) << 8) + (tm.tm_sec << 8));
|
|
const u16 hi = static_cast<u16>(tm.tm_min + (tm.tm_hour << 8) + (tm.tm_year + 1900));
|
|
|
|
return lo + (hi << 16);
|
|
}
|
|
|
|
static unsigned int get_sectors_per_cluster(u64 disk_size)
|
|
{
|
|
u64 disk_MB = disk_size / (1024 * 1024);
|
|
|
|
if (disk_MB < 260)
|
|
return 1;
|
|
|
|
if (disk_MB < 8192)
|
|
return 4;
|
|
|
|
if (disk_MB < 16384)
|
|
return 8;
|
|
|
|
if (disk_MB < 32768)
|
|
return 16;
|
|
|
|
return 32;
|
|
}
|
|
|
|
static unsigned int get_sectors_per_fat(u64 disk_size, u32 sectors_per_cluster)
|
|
{
|
|
/* Weird computation from MS - see fatgen103.doc for details */
|
|
disk_size -= RESERVED_SECTORS * BYTES_PER_SECTOR; /* Don't count 32 reserved sectors */
|
|
disk_size /= BYTES_PER_SECTOR; /* Disk size in sectors */
|
|
const u64 divider = ((256 * sectors_per_cluster) + NUM_FATS) / 2;
|
|
|
|
return static_cast<u32>((disk_size + (divider - 1)) / divider);
|
|
}
|
|
|
|
static void boot_sector_init(u8* boot, u8* info, u64 disk_size, const char* label)
|
|
{
|
|
const u32 sectors_per_cluster = get_sectors_per_cluster(disk_size);
|
|
const u32 sectors_per_fat = get_sectors_per_fat(disk_size, sectors_per_cluster);
|
|
const u32 sectors_per_disk = static_cast<u32>(disk_size / BYTES_PER_SECTOR);
|
|
const u32 serial_id = get_serial_id();
|
|
|
|
if (label == nullptr)
|
|
label = "DOLPHINSD";
|
|
|
|
WriteData<u8>(boot, 0xeb);
|
|
WriteData<u8>(boot + 1, 0x5a);
|
|
WriteData<u8>(boot + 2, 0x90);
|
|
strcpy((char*)boot + 3, "MSWIN4.1");
|
|
WriteData<u16>(boot + 0x0b, BYTES_PER_SECTOR); // Sector size
|
|
WriteData<u8>(boot + 0xd, sectors_per_cluster); // Sectors per cluster
|
|
WriteData<u16>(boot + 0xe, RESERVED_SECTORS); // Reserved sectors before first FAT
|
|
WriteData<u8>(boot + 0x10, NUM_FATS); // Number of FATs
|
|
WriteData<u16>(boot + 0x11, 0); // Max root directory entries for FAT12/FAT16, 0 for FAT32
|
|
WriteData<u16>(boot + 0x13, 0); // Total sectors, 0 to use 32-bit value at offset 0x20
|
|
WriteData<u8>(boot + 0x15, 0xF8); // Media descriptor, 0xF8 == hard disk
|
|
WriteData<u16>(boot + 0x16, 0); // Sectors per FAT for FAT12/16, 0 for FAT32
|
|
WriteData<u16>(boot + 0x18, 9); // Sectors per track (whatever)
|
|
WriteData<u16>(boot + 0x1a, 2); // Number of heads (whatever)
|
|
WriteData<u32>(boot + 0x1c, 0); // Hidden sectors
|
|
WriteData<u32>(boot + 0x20, sectors_per_disk); // Total sectors
|
|
|
|
// Extension
|
|
WriteData<u32>(boot + 0x24, sectors_per_fat); // Sectors per FAT
|
|
WriteData<u16>(boot + 0x28, 0); // FAT flags
|
|
WriteData<u16>(boot + 0x2a, 0); // Version
|
|
WriteData<u32>(boot + 0x2c, 2); // Cluster number of root directory start
|
|
WriteData<u16>(boot + 0x30, 1); // Sector number of FS information sector
|
|
WriteData<u16>(boot + 0x32, BACKUP_BOOT_SECTOR); // Sector number of a copy of this boot sector
|
|
WriteData<u8>(boot + 0x40, 0x80); // Physical drive number
|
|
WriteData<u8>(boot + 0x42, 0x29); // Extended boot signature ??
|
|
WriteData<u32>(boot + 0x43, serial_id); // Serial ID
|
|
strncpy((char*)boot + 0x47, label, 11); // Volume Label
|
|
memcpy(boot + 0x52, "FAT32 ", 8); // FAT system type, padded with 0x20
|
|
|
|
WriteData<u8>(boot + BYTES_PER_SECTOR - 2, 0x55); // Boot sector signature
|
|
WriteData<u8>(boot + BYTES_PER_SECTOR - 1, 0xAA);
|
|
|
|
/* FSInfo sector */
|
|
const u32 free_count = sectors_per_disk - 32 - 2 * sectors_per_fat;
|
|
|
|
WriteData<u32>(info + 0, 0x41615252);
|
|
WriteData<u32>(info + 484, 0x61417272);
|
|
WriteData<u32>(info + 488, free_count); // Number of free clusters
|
|
// Next free clusters, 0-1 reserved, 2 is used for the root dir
|
|
WriteData<u32>(info + 492, 3);
|
|
WriteData<u32>(info + 508, 0xAA550000);
|
|
}
|
|
|
|
static void fat_init(u8* fat)
|
|
{
|
|
WriteData<u32>(fat, 0x0ffffff8); // Reserve cluster 1, media id in low byte
|
|
WriteData<u32>(fat + 4, 0x0fffffff); // Reserve cluster 2
|
|
WriteData<u32>(fat + 8, 0x0fffffff); // End of cluster chain for root dir
|
|
}
|
|
|
|
static bool write_sector(File::IOFile& file, const u8* sector)
|
|
{
|
|
return file.WriteBytes(sector, BYTES_PER_SECTOR);
|
|
}
|
|
|
|
static bool write_empty(File::IOFile& file, std::size_t count)
|
|
{
|
|
static constexpr u8 empty[64 * 1024] = {};
|
|
|
|
count *= BYTES_PER_SECTOR;
|
|
while (count > 0)
|
|
{
|
|
const std::size_t len = std::min(sizeof(empty), count);
|
|
|
|
if (!file.WriteBytes(empty, len))
|
|
return false;
|
|
|
|
count -= len;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool SDCardCreate(u64 disk_size /*in MB*/, const std::string& filename)
|
|
{
|
|
// Convert MB to bytes
|
|
disk_size *= 1024 * 1024;
|
|
|
|
if (disk_size < 0x800000 || disk_size > 0x800000000ULL)
|
|
{
|
|
ERROR_LOG_FMT(COMMON, "Trying to create SD Card image of size {}MB is out of range (8MB-32GB)",
|
|
disk_size / (1024 * 1024));
|
|
return false;
|
|
}
|
|
|
|
// Pretty unlikely to overflow.
|
|
const u32 sectors_per_disk = static_cast<u32>(disk_size / BYTES_PER_SECTOR);
|
|
const u32 sectors_per_fat = get_sectors_per_fat(disk_size, get_sectors_per_cluster(disk_size));
|
|
|
|
boot_sector_init(s_boot_sector, s_fsinfo_sector, disk_size, nullptr);
|
|
fat_init(s_fat_head);
|
|
|
|
File::IOFile file(filename, "wb");
|
|
if (!file)
|
|
{
|
|
ERROR_LOG_FMT(COMMON, "Could not create file '{}', aborting...", filename);
|
|
return false;
|
|
}
|
|
|
|
/* Here's the layout:
|
|
*
|
|
* boot_sector
|
|
* fsinfo_sector
|
|
* empty
|
|
* backup boot sector
|
|
* backup fsinfo sector
|
|
* RESERVED_SECTORS - 4 empty sectors (if backup sectors), or RESERVED_SECTORS - 2 (if no backup)
|
|
* first fat
|
|
* second fat
|
|
* zero sectors
|
|
*/
|
|
|
|
if (!write_sector(file, s_boot_sector))
|
|
goto FailWrite;
|
|
|
|
if (!write_sector(file, s_fsinfo_sector))
|
|
goto FailWrite;
|
|
|
|
if constexpr (BACKUP_BOOT_SECTOR > 0)
|
|
{
|
|
if (!write_empty(file, BACKUP_BOOT_SECTOR - 2))
|
|
goto FailWrite;
|
|
|
|
if (!write_sector(file, s_boot_sector))
|
|
goto FailWrite;
|
|
|
|
if (!write_sector(file, s_fsinfo_sector))
|
|
goto FailWrite;
|
|
|
|
if (!write_empty(file, RESERVED_SECTORS - 2 - BACKUP_BOOT_SECTOR))
|
|
goto FailWrite;
|
|
}
|
|
else
|
|
{
|
|
if (!write_empty(file, RESERVED_SECTORS - 2))
|
|
goto FailWrite;
|
|
}
|
|
|
|
if (!write_sector(file, s_fat_head))
|
|
goto FailWrite;
|
|
|
|
if (!write_empty(file, sectors_per_fat - 1))
|
|
goto FailWrite;
|
|
|
|
if (!write_sector(file, s_fat_head))
|
|
goto FailWrite;
|
|
|
|
if (!write_empty(file, sectors_per_fat - 1))
|
|
goto FailWrite;
|
|
|
|
if (!write_empty(file, sectors_per_disk - RESERVED_SECTORS - 2 * sectors_per_fat))
|
|
goto FailWrite;
|
|
|
|
return true;
|
|
|
|
FailWrite:
|
|
ERROR_LOG_FMT(COMMON, "Could not write to '{}', aborting...", filename);
|
|
if (unlink(filename.c_str()) < 0)
|
|
ERROR_LOG_FMT(COMMON, "unlink({}) failed: {}", filename, LastStrerrorString());
|
|
return false;
|
|
}
|
|
} // namespace Common
|