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DSi_NAND.cpp
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/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS 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.
melonDS 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 melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <codecvt>
#include "DSi.h"
#include "DSi_AES.h"
#include "DSi_NAND.h"
#include "FATIO.h"
#include "Platform.h"
#include "sha1/sha1.hpp"
#include "tiny-AES-c/aes.hpp"
#include "fatfs/ff.h"
using namespace melonDS::Platform;
namespace melonDS::DSi_NAND
{
NANDImage::NANDImage(Platform::FileHandle* nandfile, const DSiKey& es_keyY) noexcept : NANDImage(nandfile, es_keyY.data())
{
}
NANDImage::NANDImage(Platform::FileHandle* nandfile, const u8* es_keyY) noexcept
{
if (!nandfile)
return;
Length = FileLength(nandfile);
// read the nocash footer
FileSeek(nandfile, -0x40, FileSeekOrigin::End);
char nand_footer[16];
const char* nand_footer_ref = "DSi eMMC CID/CPU";
FileRead(nand_footer, 1, sizeof(nand_footer), nandfile);
if (memcmp(nand_footer, nand_footer_ref, sizeof(nand_footer)))
{
// There is another copy of the footer at 000FF800h for the case
// that by external tools the image was cut off
// See https://problemkaputt.de/gbatek.htm#dsisdmmcimages
FileSeek(nandfile, 0x000FF800, FileSeekOrigin::Start);
FileRead(nand_footer, 1, sizeof(nand_footer), nandfile);
if (memcmp(nand_footer, nand_footer_ref, sizeof(nand_footer)))
{
Log(LogLevel::Error, "ERROR: NAND missing nocash footer\n");
CloseFile(nandfile);
return;
}
}
FileRead(eMMC_CID.data(), 1, sizeof(eMMC_CID), nandfile);
FileRead(&ConsoleID, 1, sizeof(ConsoleID), nandfile);
// init NAND crypto
SHA1_CTX sha;
u8 tmp[20];
u8 keyX[16], keyY[16];
SHA1Init(&sha);
SHA1Update(&sha, eMMC_CID.data(), sizeof(eMMC_CID));
SHA1Final(tmp, &sha);
Bswap128(FATIV.data(), tmp);
*(u32*)&keyX[0] = (u32)ConsoleID;
*(u32*)&keyX[4] = (u32)ConsoleID ^ 0x24EE6906;
*(u32*)&keyX[8] = (u32)(ConsoleID >> 32) ^ 0xE65B601D;
*(u32*)&keyX[12] = (u32)(ConsoleID >> 32);
*(u32*)&keyY[0] = 0x0AB9DC76;
*(u32*)&keyY[4] = 0xBD4DC4D3;
*(u32*)&keyY[8] = 0x202DDD1D;
*(u32*)&keyY[12] = 0xE1A00005;
DSi_AES::DeriveNormalKey(keyX, keyY, tmp);
Bswap128(FATKey.data(), tmp);
*(u32*)&keyX[0] = 0x4E00004A;
*(u32*)&keyX[4] = 0x4A00004E;
*(u32*)&keyX[8] = (u32)(ConsoleID >> 32) ^ 0xC80C4B72;
*(u32*)&keyX[12] = (u32)ConsoleID;
memcpy(keyY, es_keyY, sizeof(keyY));
DSi_AES::DeriveNormalKey(keyX, keyY, tmp);
Bswap128(ESKey.data(), tmp);
CurFile = nandfile;
}
NANDImage::~NANDImage()
{
if (CurFile) CloseFile(CurFile);
CurFile = nullptr;
}
NANDImage::NANDImage(NANDImage&& other) noexcept :
CurFile(other.CurFile),
eMMC_CID(other.eMMC_CID),
ConsoleID(other.ConsoleID),
FATIV(other.FATIV),
FATKey(other.FATKey),
ESKey(other.ESKey),
Length(other.Length)
{
other.CurFile = nullptr;
}
NANDImage& NANDImage::operator=(NANDImage&& other) noexcept
{
if (this != &other)
{
if (CurFile)
CloseFile(CurFile);
CurFile = other.CurFile;
eMMC_CID = other.eMMC_CID;
ConsoleID = other.ConsoleID;
FATIV = other.FATIV;
FATKey = other.FATKey;
ESKey = other.ESKey;
Length = other.Length;
other.CurFile = nullptr;
}
return *this;
}
NANDMount::NANDMount(NANDImage& nand) noexcept : Image(&nand)
{
if (!nand)
return;
CurFS = std::make_unique<FATFS>();
ff_disk_open(
[this](BYTE* buf, LBA_t sector, UINT num) {
return this->FF_ReadNAND(buf, sector, num);
},
[this](const BYTE* buf, LBA_t sector, UINT num) {
return this->FF_WriteNAND(buf, sector, num);
},
(LBA_t)(nand.GetLength()>>9)
);
FRESULT res;
res = f_mount(CurFS.get(), "0:", 0);
if (res != FR_OK)
{
Log(LogLevel::Error, "NAND mounting failed: %d\n", res);
f_unmount("0:");
ff_disk_close();
return;
}
}
NANDMount::~NANDMount() noexcept
{
f_unmount("0:");
ff_disk_close();
}
void NANDImage::SetupFATCrypto(AES_ctx* ctx, u32 ctr)
{
u8 iv[16];
memcpy(iv, FATIV.data(), sizeof(iv));
u8 ctr_value[16] = {0};
ctr_value[15] = ctr & 0xFF;
ctr_value[14] = (ctr >> 8) & 0xFF;
ctr_value[13] = (ctr >> 16) & 0xFF;
ctr_value[12] = (ctr >> 24) & 0xFF;
unsigned carry = 0;
for (unsigned i = 0; i < 16; i ++) {
unsigned j = 15-i;
unsigned x = iv[j] + ctr_value[j] + carry;
carry = x >= 0x100;
iv[j] = x;
}
AES_init_ctx_iv(ctx, FATKey.data(), iv);
}
u32 NANDImage::ReadFATBlock(u64 addr, u32 len, u8* buf)
{
u32 ctr = (u32)(addr >> 4);
AES_ctx ctx;
SetupFATCrypto(&ctx, ctr);
FileSeek(CurFile, addr, FileSeekOrigin::Start);
u32 res = FileRead(buf, len, 1, CurFile);
if (!res) return 0;
for (u32 i = 0; i < len; i += 16)
{
u8 tmp[16];
Bswap128(tmp, &buf[i]);
AES_CTR_xcrypt_buffer(&ctx, tmp, sizeof(tmp));
Bswap128(&buf[i], tmp);
}
return len;
}
u32 NANDImage::WriteFATBlock(u64 addr, u32 len, const u8* buf)
{
u32 ctr = (u32)(addr >> 4);
AES_ctx ctx;
SetupFATCrypto(&ctx, ctr);
FileSeek(CurFile, addr, FileSeekOrigin::Start);
for (u32 s = 0; s < len; s += 0x200)
{
u8 tempbuf[0x200];
for (u32 i = 0; i < 0x200; i += 16)
{
u8 tmp[16];
Bswap128(tmp, &buf[s+i]);
AES_CTR_xcrypt_buffer(&ctx, tmp, sizeof(tmp));
Bswap128(&tempbuf[i], tmp);
}
u32 res = FileWrite(tempbuf, sizeof(tempbuf), 1, CurFile);
if (!res) return 0;
}
return len;
}
UINT NANDMount::FF_ReadNAND(BYTE* buf, LBA_t sector, UINT num)
{
// TODO: allow selecting other partitions?
u64 baseaddr = 0x10EE00;
u64 blockaddr = baseaddr + (sector * 0x200ULL);
u32 res = Image->ReadFATBlock(blockaddr, num*0x200, buf);
return res >> 9;
}
UINT NANDMount::FF_WriteNAND(const BYTE* buf, LBA_t sector, UINT num)
{
// TODO: allow selecting other partitions?
u64 baseaddr = 0x10EE00;
u64 blockaddr = baseaddr + (sector * 0x200ULL);
u32 res = Image->WriteFATBlock(blockaddr, num*0x200, buf);
return res >> 9;
}
bool NANDImage::ESEncrypt(u8* data, u32 len) const
{
AES_ctx ctx;
u8 iv[16];
u8 mac[16];
iv[0] = 0x02;
for (int i = 0; i < 12; i++) iv[1+i] = data[len+0x1C-i];
iv[13] = 0x00;
iv[14] = 0x00;
iv[15] = 0x01;
AES_init_ctx_iv(&ctx, ESKey.data(), iv);
u32 blklen = (len + 0xF) & ~0xF;
mac[0] = 0x3A;
for (int i = 1; i < 13; i++) mac[i] = iv[i];
mac[13] = (blklen >> 16) & 0xFF;
mac[14] = (blklen >> 8) & 0xFF;
mac[15] = blklen & 0xFF;
AES_ECB_encrypt(&ctx, mac);
u32 coarselen = len & ~0xF;
for (u32 i = 0; i < coarselen; i += 16)
{
u8 tmp[16];
Bswap128(tmp, &data[i]);
for (int i = 0; i < 16; i++) mac[i] ^= tmp[i];
AES_CTR_xcrypt_buffer(&ctx, tmp, 16);
AES_ECB_encrypt(&ctx, mac);
Bswap128(&data[i], tmp);
}
u32 remlen = len - coarselen;
if (remlen)
{
u8 rem[16];
memset(rem, 0, 16);
for (int i = 0; i < remlen; i++)
rem[15-i] = data[coarselen+i];
for (int i = 0; i < 16; i++) mac[i] ^= rem[i];
AES_CTR_xcrypt_buffer(&ctx, rem, sizeof(rem));
AES_ECB_encrypt(&ctx, mac);
for (int i = 0; i < remlen; i++)
data[coarselen+i] = rem[15-i];
}
ctx.Iv[13] = 0x00;
ctx.Iv[14] = 0x00;
ctx.Iv[15] = 0x00;
AES_CTR_xcrypt_buffer(&ctx, mac, sizeof(mac));
Bswap128(&data[len], mac);
u8 footer[16];
iv[0] = 0x00;
iv[1] = 0x00;
iv[2] = 0x00;
for (int i = 0; i < 12; i++) iv[3+i] = data[len+0x1C-i];
iv[15] = 0x00;
footer[15] = 0x3A;
footer[2] = (len >> 16) & 0xFF;
footer[1] = (len >> 8) & 0xFF;
footer[0] = len & 0xFF;
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, footer, sizeof(footer));
data[len+0x10] = footer[15];
data[len+0x1D] = footer[2];
data[len+0x1E] = footer[1];
data[len+0x1F] = footer[0];
return true;
}
bool NANDImage::ESDecrypt(u8* data, u32 len) const
{
AES_ctx ctx;
u8 iv[16];
u8 mac[16];
iv[0] = 0x02;
for (int i = 0; i < 12; i++) iv[1+i] = data[len+0x1C-i];
iv[13] = 0x00;
iv[14] = 0x00;
iv[15] = 0x01;
AES_init_ctx_iv(&ctx, ESKey.data(), iv);
u32 blklen = (len + 0xF) & ~0xF;
mac[0] = 0x3A;
for (int i = 1; i < 13; i++) mac[i] = iv[i];
mac[13] = (blklen >> 16) & 0xFF;
mac[14] = (blklen >> 8) & 0xFF;
mac[15] = blklen & 0xFF;
AES_ECB_encrypt(&ctx, mac);
u32 coarselen = len & ~0xF;
for (u32 i = 0; i < coarselen; i += 16)
{
u8 tmp[16];
Bswap128(tmp, &data[i]);
AES_CTR_xcrypt_buffer(&ctx, tmp, sizeof(tmp));
for (int i = 0; i < 16; i++) mac[i] ^= tmp[i];
AES_ECB_encrypt(&ctx, mac);
Bswap128(&data[i], tmp);
}
u32 remlen = len - coarselen;
if (remlen)
{
u8 rem[16];
u32 ivnum = (coarselen >> 4) + 1;
iv[13] = (ivnum >> 16) & 0xFF;
iv[14] = (ivnum >> 8) & 0xFF;
iv[15] = ivnum & 0xFF;
memset(rem, 0, 16);
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, rem, 16);
for (int i = 0; i < remlen; i++)
rem[15-i] = data[coarselen+i];
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, rem, 16);
for (int i = 0; i < 16; i++) mac[i] ^= rem[i];
AES_ECB_encrypt(&ctx, mac);
for (int i = 0; i < remlen; i++)
data[coarselen+i] = rem[15-i];
}
ctx.Iv[13] = 0x00;
ctx.Iv[14] = 0x00;
ctx.Iv[15] = 0x00;
AES_CTR_xcrypt_buffer(&ctx, mac, 16);
u8 footer[16];
iv[0] = 0x00;
iv[1] = 0x00;
iv[2] = 0x00;
for (int i = 0; i < 12; i++) iv[3+i] = data[len+0x1C-i];
iv[15] = 0x00;
Bswap128(footer, &data[len+0x10]);
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, footer, sizeof(footer));
data[len+0x10] = footer[15];
data[len+0x1D] = footer[2];
data[len+0x1E] = footer[1];
data[len+0x1F] = footer[0];
u32 footerlen = footer[0] | (footer[1] << 8) | (footer[2] << 16);
if (footerlen != len)
{
Log(LogLevel::Error, "ESDecrypt: bad length %d (expected %d)\n", len, footerlen);
return false;
}
for (int i = 0; i < 16; i++)
{
if (data[len+i] != mac[15-i])
{
Log(LogLevel::Warn, "ESDecrypt: bad MAC\n");
return false;
}
}
return true;
}
bool NANDMount::ReadSerialData(DSiSerialData& dataS)
{
FF_FIL file;
FRESULT res = f_open(&file, "0:/sys/HWINFO_S.dat", FA_OPEN_EXISTING | FA_READ);
if (res == FR_OK)
{
u32 nread;
f_read(&file, &dataS, sizeof(DSiSerialData), &nread);
f_close(&file);
}
return res == FR_OK;
}
bool NANDMount::ReadHardwareInfoN(DSiHardwareInfoN& dataN)
{
FF_FIL file;
FRESULT res = f_open(&file, "0:/sys/HWINFO_N.dat", FA_OPEN_EXISTING | FA_READ);
if (res == FR_OK)
{
u32 nread;
f_read(&file, dataN.data(), sizeof(dataN), &nread);
f_close(&file);
}
return res == FR_OK;
}
void NANDMount::ReadHardwareInfo(DSiSerialData& dataS, DSiHardwareInfoN& dataN)
{
ReadSerialData(dataS);
ReadHardwareInfoN(dataN);
}
bool NANDMount::ReadUserData(DSiFirmwareSystemSettings& data)
{
FF_FIL file;
FRESULT res;
u32 nread;
FF_FIL f1, f2;
int v1, v2;
res = f_open(&f1, "0:/shared1/TWLCFG0.dat", FA_OPEN_EXISTING | FA_READ);
if (res != FR_OK)
v1 = -1;
else
{
u8 tmp;
f_lseek(&f1, 0x81);
f_read(&f1, &tmp, 1, &nread);
v1 = tmp;
}
res = f_open(&f2, "0:/shared1/TWLCFG1.dat", FA_OPEN_EXISTING | FA_READ);
if (res != FR_OK)
v2 = -1;
else
{
u8 tmp;
f_lseek(&f2, 0x81);
f_read(&f2, &tmp, 1, &nread);
v2 = tmp;
}
if (v1 < 0 && v2 < 0) return false;
if (v2 > v1)
{
file = f2;
f_close(&f1);
}
else
{
file = f1;
f_close(&f2);
}
f_lseek(&file, 0);
f_read(&file, &data, sizeof(DSiFirmwareSystemSettings), &nread);
f_close(&file);
return true;
}
static bool SaveUserData(const char* filename, const DSiFirmwareSystemSettings& data)
{
FF_FIL file;
if (FRESULT res = f_open(&file, filename, FA_OPEN_EXISTING | FA_READ | FA_WRITE); res != FR_OK)
{
Log(LogLevel::Error, "NAND: editing file %s failed: %d\n", filename, res);
return false;
}
// TODO: If the file couldn't be opened, try creating a new one in its place
// (after all, we have the data for that)
u32 bytes_written = 0;
FRESULT res = f_write(&file, &data, sizeof(DSiFirmwareSystemSettings), &bytes_written);
f_close(&file);
if (res != FR_OK || bytes_written != sizeof(DSiFirmwareSystemSettings))
{
Log(LogLevel::Error, "NAND: editing file %s failed: %d\n", filename, res);
return false;
}
return true;
}
bool NANDMount::ApplyUserData(const DSiFirmwareSystemSettings& data)
{
bool ok0 = SaveUserData("0:/shared1/TWLCFG0.dat", data);
bool ok1 = SaveUserData("0:/shared1/TWLCFG1.dat", data);
return ok0 && ok1;
}
void debug_listfiles(const char* path)
{
FF_DIR dir;
FF_FILINFO info;
FRESULT res;
res = f_opendir(&dir, path);
if (res != FR_OK) return;
for (;;)
{
res = f_readdir(&dir, &info);
if (res != FR_OK) break;
if (!info.fname[0]) break;
char fullname[512];
snprintf(fullname, sizeof(fullname), "%s/%s", path, info.fname);
Log(LogLevel::Debug, "[%c] %s\n", (info.fattrib&AM_DIR)?'D':'F', fullname);
if (info.fattrib & AM_DIR)
{
debug_listfiles(fullname);
}
}
f_closedir(&dir);
}
bool NANDMount::ImportFile(const char* path, const u8* data, size_t len)
{
if (!data || !len || !path)
return false;
FF_FIL file;
FRESULT res;
res = f_open(&file, path, FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK)
{
return false;
}
u8 buf[0x1000];
for (u32 i = 0; i < len; i += sizeof(buf))
{ // For each block in the file...
u32 blocklen;
if ((i + sizeof(buf)) > len)
blocklen = len - i;
else
blocklen = sizeof(buf);
u32 nwrite;
memcpy(buf, data + i, blocklen);
f_write(&file, buf, blocklen, &nwrite);
}
f_close(&file);
Log(LogLevel::Debug, "Imported file from memory to %s\n", path);
return true;
}
bool NANDMount::ImportFile(const char* path, const char* in)
{
FF_FIL file;
FRESULT res;
Platform::FileHandle* fin = OpenLocalFile(in, FileMode::Read);
if (!fin)
return false;
u32 len = FileLength(fin);
res = f_open(&file, path, FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK)
{
CloseFile(fin);
return false;
}
u8 buf[0x1000];
for (u32 i = 0; i < len; i += sizeof(buf))
{
u32 blocklen;
if ((i + sizeof(buf)) > len)
blocklen = len - i;
else
blocklen = sizeof(buf);
u32 nwrite;
FileRead(buf, blocklen, 1, fin);
f_write(&file, buf, blocklen, &nwrite);
}
CloseFile(fin);
f_close(&file);
Log(LogLevel::Debug, "Imported file from %s to %s\n", in, path);
return true;
}
bool NANDMount::ExportFile(const char* path, const char* out)
{
FF_FIL file;
FRESULT res;
res = f_open(&file, path, FA_OPEN_EXISTING | FA_READ);
if (res != FR_OK)
return false;
u32 len = f_size(&file);
Platform::FileHandle* fout = OpenLocalFile(out, FileMode::Write);
if (!fout)
{
f_close(&file);
return false;
}
u8 buf[0x1000];
for (u32 i = 0; i < len; i += 0x1000)
{
u32 blocklen;
if ((i + 0x1000) > len)
blocklen = len - i;
else
blocklen = 0x1000;
u32 nread;
f_read(&file, buf, blocklen, &nread);
FileWrite(buf, blocklen, 1, fout);
}
CloseFile(fout);
f_close(&file);
Log(LogLevel::Debug, "Exported file from %s to %s\n", path, out);
return true;
}
void NANDMount::RemoveFile(const char* path)
{
FF_FILINFO info;
FRESULT res = f_stat(path, &info);
if (res != FR_OK) return;
if (info.fattrib & AM_RDO)
f_chmod(path, 0, AM_RDO);
f_unlink(path);
Log(LogLevel::Debug, "Removed file at %s\n", path);
}
void NANDMount::RemoveDir(const char* path)
{
FF_DIR dir;
FF_FILINFO info;
FRESULT res;
res = f_stat(path, &info);
if (res != FR_OK) return;
if (info.fattrib & AM_RDO)
f_chmod(path, 0, AM_RDO);
res = f_opendir(&dir, path);
if (res != FR_OK) return;
std::vector<std::string> dirlist;
std::vector<std::string> filelist;
for (;;)
{
res = f_readdir(&dir, &info);
if (res != FR_OK) break;
if (!info.fname[0]) break;
char fullname[512];
snprintf(fullname, sizeof(fullname), "%s/%s", path, info.fname);
if (info.fattrib & AM_RDO)
f_chmod(path, 0, AM_RDO);
if (info.fattrib & AM_DIR)
dirlist.push_back(fullname);
else
filelist.push_back(fullname);
}
f_closedir(&dir);
for (std::vector<std::string>::iterator it = dirlist.begin(); it != dirlist.end(); it++)
{
const char* path = (*it).c_str();
RemoveDir(path);
}
for (std::vector<std::string>::iterator it = filelist.begin(); it != filelist.end(); it++)
{
const char* path = (*it).c_str();
f_unlink(path);
}
f_unlink(path);
Log(LogLevel::Debug, "Removed directory at %s\n", path);
}
u32 NANDMount::GetTitleVersion(u32 category, u32 titleid)
{
FRESULT res;
char path[256];
snprintf(path, sizeof(path), "0:/title/%08x/%08x/content/title.tmd", category, titleid);
FF_FIL file;
res = f_open(&file, path, FA_OPEN_EXISTING | FA_READ);
if (res != FR_OK)
return 0xFFFFFFFF;
u32 version;
u32 nread;
f_lseek(&file, 0x1E4);
f_read(&file, &version, 4, &nread);
version = (version >> 24) | ((version & 0xFF0000) >> 8) | ((version & 0xFF00) << 8) | (version << 24);
f_close(&file);
return version;
}
void NANDMount::ListTitles(u32 category, std::vector<u32>& titlelist)
{
FRESULT res;
FF_DIR titledir;
char path[256];
snprintf(path, sizeof(path), "0:/title/%08x", category);
res = f_opendir(&titledir, path);
if (res != FR_OK)
{
Log(LogLevel::Warn, "NAND: !! no title dir (%s)\n", path);
return;
}
for (;;)
{
FF_FILINFO info;
f_readdir(&titledir, &info);
if (!info.fname[0])
break;
if (strlen(info.fname) != 8)
continue;
u32 titleid;
if (sscanf(info.fname, "%08x", &titleid) < 1)
continue;
u32 version = GetTitleVersion(category, titleid);
if (version == 0xFFFFFFFF)
continue;
snprintf(path, sizeof(path), "0:/title/%08x/%08x/content/%08x.app", category, titleid, version);
FF_FILINFO appinfo;
res = f_stat(path, &appinfo);
if (res != FR_OK)
continue;
if (appinfo.fattrib & AM_DIR)
continue;
if (appinfo.fsize < 0x4000)
continue;
// title is good, add it to the list
titlelist.push_back(titleid);
}
f_closedir(&titledir);
}
bool NANDMount::TitleExists(u32 category, u32 titleid)
{
char path[256];
snprintf(path, sizeof(path), "0:/title/%08x/%08x/content/title.tmd", category, titleid);
FRESULT res = f_stat(path, nullptr);
return (res == FR_OK);
}
void NANDMount::GetTitleInfo(u32 category, u32 titleid, u32& version, NDSHeader* header, NDSBanner* banner)
{
version = GetTitleVersion(category, titleid);
if (version == 0xFFFFFFFF)
return;
FRESULT res;
char path[256];
snprintf(path, sizeof(path), "0:/title/%08x/%08x/content/%08x.app", category, titleid, version);
FF_FIL file;
res = f_open(&file, path, FA_OPEN_EXISTING | FA_READ);
if (res != FR_OK)
return;
u32 nread;
f_read(&file, header, sizeof(NDSHeader), &nread);
if (banner)
{
u32 banneraddr = header->BannerOffset;
if (!banneraddr)
{
memset(banner, 0, sizeof(NDSBanner));
}
else
{
f_lseek(&file, banneraddr);
f_read(&file, banner, sizeof(NDSBanner), &nread);
}
}
f_close(&file);
}
bool NANDMount::CreateTicket(const char* path, u32 titleid0, u32 titleid1, u8 version)
{
FF_FIL file;
FRESULT res;
u32 nwrite;
res = f_open(&file, path, FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK)
{
Log(LogLevel::Error, "CreateTicket: failed to create file (%d)\n", res);
return false;
}
u8 ticket[0x2C4];
memset(ticket, 0, 0x2C4);
// signature, atleast make it look like we tried :P
*(u32*)&ticket[0x000] = 0x01000100;
strcpy((char*)&ticket[0x140], "Root-CA00000001-XS00000006");
*(u32*)&ticket[0x1DC] = titleid0;
*(u32*)&ticket[0x1E0] = titleid1;
ticket[0x1E6] = version;
memset(&ticket[0x222], 0xFF, 0x20);
Image->ESEncrypt(ticket, 0x2A4);
f_write(&file, ticket, 0x2C4, &nwrite);
f_close(&file);
return true;
}
bool NANDMount::CreateSaveFile(const char* path, u32 len)
{
if (len == 0) return true;
if (len < 0x200) return false;
if (len > 0x8000000) return false;
u32 clustersize, maxfiles, totsec16, fatsz16;
// CHECKME!
// code inspired from https://github.com/Epicpkmn11/NTM/blob/master/arm9/src/sav.c
const u16 sectorsize = 0x200;
// fit maximum sectors for the size
const u16 maxsectors = len / sectorsize;
u16 tracksize = 1;
u16 headcount = 1;
u16 totsec16next = 0;
while (totsec16next <= maxsectors)
{
totsec16next = tracksize * (headcount + 1) * (headcount + 1);
if (totsec16next <= maxsectors)
{
headcount++;
totsec16 = totsec16next;
tracksize++;
totsec16next = tracksize * headcount * headcount;
if (totsec16next <= maxsectors)
{
totsec16 = totsec16next;
}
}
}
totsec16next = (tracksize + 1) * headcount * headcount;
if (totsec16next <= maxsectors)
{
tracksize++;
totsec16 = totsec16next;
}
maxfiles = len < 0x8C000 ? 0x20 : 0x200;
clustersize = (totsec16 > (8 << 10)) ? 8 : (totsec16 > (1 << 10) ? 4 : 1);
#define ALIGN(v, a) (((v) % (a)) ? ((v) + (a) - ((v) % (a))) : (v))
u16 totalclusters = ALIGN(totsec16, clustersize) / clustersize;
u32 fatbytes = (ALIGN(totalclusters, 2) / 2) * 3; // 2 sectors -> 3 byte
fatsz16 = ALIGN(fatbytes, sectorsize) / sectorsize;
FF_FIL file;