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Atmosphere/stratosphere/libstratosphere/source/updater/updater_bis_management.cpp
Michael Scire f534d3498e git subrepo clone https://github.com/Atmosphere-NX/libstratosphere stratosphere/libstratosphere
subrepo:
  subdir:   "stratosphere/libstratosphere"
  merged:   "0c5dab80"
upstream:
  origin:   "https://github.com/Atmosphere-NX/libstratosphere"
  branch:   "master"
  commit:   "0c5dab80"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"
2019-07-17 20:04:00 -07:00

168 lines
5.8 KiB
C++

/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#include <switch.h>
#include <stratosphere.hpp>
#include "updater_bis_management.hpp"
namespace sts::updater {
Result BisAccessor::Initialize() {
R_TRY(fsOpenBisStorage(&this->storage, this->partition_id));
this->active = true;
return ResultSuccess;
}
void BisAccessor::Finalize() {
if (this->active) {
fsStorageClose(&this->storage);
this->active = false;
}
}
Result BisAccessor::Read(void *dst, size_t size, u64 offset) {
if (offset % SectorAlignment) {
std::abort();
}
return fsStorageRead(&this->storage, offset, dst, size);
}
Result BisAccessor::Write(u64 offset, const void *src, size_t size) {
if (offset % SectorAlignment) {
std::abort();
}
return fsStorageWrite(&this->storage, offset, src, size);
}
Result BisAccessor::Write(u64 offset, size_t size, const char *bip_path, void *work_buffer, size_t work_buffer_size) {
if (offset % SectorAlignment != 0 || work_buffer_size % SectorAlignment != 0) {
std::abort();
}
FILE *bip_fp = fopen(bip_path, "rb");
if (bip_fp == NULL) {
return ResultUpdaterInvalidBootImagePackage;
}
ON_SCOPE_EXIT { fclose(bip_fp); };
size_t written = 0;
while (true) {
std::memset(work_buffer, 0, work_buffer_size);
size_t read_size = fread(work_buffer, 1, work_buffer_size, bip_fp);
if (read_size != work_buffer_size) {
if (ferror(bip_fp)) {
return fsdevGetLastResult();
}
}
if (written + read_size > size) {
std::abort();
}
size_t aligned_size = ((read_size + SectorAlignment - 1) / SectorAlignment) * SectorAlignment;
R_TRY(this->Write(offset + written, work_buffer, aligned_size));
written += read_size;
if (read_size != work_buffer_size) {
break;
}
}
return ResultSuccess;
}
Result BisAccessor::Clear(u64 offset, u64 size, void *work_buffer, size_t work_buffer_size) {
if (offset % SectorAlignment != 0 || work_buffer_size % SectorAlignment != 0) {
std::abort();
}
std::memset(work_buffer, 0, work_buffer_size);
size_t written = 0;
while (written < size) {
size_t cur_write_size = std::min(work_buffer_size, size - written);
R_TRY(this->Write(offset + written, work_buffer, cur_write_size));
written += cur_write_size;
}
return ResultSuccess;
}
Result BisAccessor::GetHash(void *dst, u64 offset, u64 size, u64 hash_size, void *work_buffer, size_t work_buffer_size) {
if (offset % SectorAlignment != 0 || work_buffer_size % SectorAlignment != 0) {
std::abort();
}
Sha256Context sha_ctx;
sha256ContextCreate(&sha_ctx);
size_t total_read = 0;
while (total_read < hash_size) {
size_t cur_read_size = std::min(work_buffer_size, size - total_read);
size_t cur_update_size = std::min(cur_read_size, hash_size - total_read);
R_TRY(this->Read(work_buffer, cur_read_size, offset + total_read));
sha256ContextUpdate(&sha_ctx, work_buffer, cur_update_size);
total_read += cur_read_size;
}
sha256ContextGetHash(&sha_ctx, dst);
return ResultSuccess;
}
size_t Boot0Accessor::GetBootloaderVersion(void *bct) {
u32 version = *reinterpret_cast<u32 *>(reinterpret_cast<uintptr_t>(bct) + BctVersionOffset);
if (version > BctVersionMax) {
std::abort();
}
return static_cast<size_t>(version);
}
size_t Boot0Accessor::GetEksIndex(size_t bootloader_version) {
if (bootloader_version > BctVersionMax) {
std::abort();
}
return (bootloader_version > 0) ? bootloader_version - 1 : 0;
}
void Boot0Accessor::CopyEks(void *dst_bct, const void *src_eks, size_t eks_index) {
std::memcpy(reinterpret_cast<u8 *>(dst_bct) + BctEksOffset, reinterpret_cast<const u8 *>(src_eks) + eks_index * EksEntrySize, EksBlobSize);
}
Result Boot0Accessor::UpdateEks(void *dst_bct, void *eks_work_buffer) {
size_t read_size;
R_TRY(this->Read(&read_size, eks_work_buffer, EksSize, Boot0Partition::Eks));
return this->UpdateEksManually(dst_bct, eks_work_buffer);
}
Result Boot0Accessor::UpdateEksManually(void *dst_bct, const void *src_eks) {
this->CopyEks(dst_bct, src_eks, GetEksIndex(GetBootloaderVersion(dst_bct)));
return ResultSuccess;
}
Result Boot0Accessor::PreserveAutoRcm(void *dst_bct, void *work_buffer, Boot0Partition which) {
std::memset(work_buffer, 0, BctSize);
size_t read_size;
R_TRY(this->Read(&read_size, work_buffer, BctSize, which));
void *dst_pubk = reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(dst_bct) + BctPubkOffset);
void *src_pubk = reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(work_buffer) + BctPubkOffset);
std::memcpy(dst_pubk, src_pubk, BctPubkSize);
return ResultSuccess;
}
}