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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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262 lines
11 KiB
C++
262 lines
11 KiB
C++
/*
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* Copyright (c) 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 <stratosphere.hpp>
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namespace ams::fssystem {
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namespace {
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template<typename T>
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constexpr ALWAYS_INLINE size_t GetRoundDownDifference(T x, size_t align) {
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return static_cast<size_t>(x - util::AlignDown(x, align));
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}
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template<typename T>
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constexpr ALWAYS_INLINE size_t GetRoundUpDifference(T x, size_t align) {
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return static_cast<size_t>(util::AlignUp(x, align) - x);
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}
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template<typename T>
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ALWAYS_INLINE size_t GetRoundUpDifference(T *x, size_t align) {
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return GetRoundUpDifference(reinterpret_cast<uintptr_t>(x), align);
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}
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}
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Result AlignmentMatchingStorageImpl::Read(fs::IStorage *base_storage, char *work_buf, size_t work_buf_size, size_t data_alignment, size_t buffer_alignment, s64 offset, char *buffer, size_t size) {
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/* Check preconditions. */
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AMS_ASSERT(work_buf_size >= data_alignment);
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AMS_UNUSED(work_buf_size);
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/* Succeed if zero size. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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/* Determine extents. */
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char *aligned_core_buffer;
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s64 core_offset;
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size_t core_size;
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size_t buffer_gap;
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size_t offset_gap;
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s64 covered_offset;
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const size_t offset_round_up_difference = GetRoundUpDifference(offset, data_alignment);
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if (util::IsAligned(reinterpret_cast<uintptr_t>(buffer) + offset_round_up_difference, buffer_alignment)) {
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aligned_core_buffer = buffer + offset_round_up_difference;
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core_offset = util::AlignUp(offset, data_alignment);
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core_size = (size < offset_round_up_difference) ? 0 : util::AlignDown(size - offset_round_up_difference, data_alignment);
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buffer_gap = 0;
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offset_gap = 0;
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covered_offset = core_size > 0 ? core_offset : offset;
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} else {
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const size_t buffer_round_up_difference = GetRoundUpDifference(buffer, buffer_alignment);
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aligned_core_buffer = buffer + buffer_round_up_difference;
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core_offset = util::AlignDown(offset, data_alignment);
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core_size = (size < buffer_round_up_difference) ? 0 : util::AlignDown(size - buffer_round_up_difference, data_alignment);
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buffer_gap = buffer_round_up_difference;
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offset_gap = GetRoundDownDifference(offset, data_alignment);
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covered_offset = offset;
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}
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/* Read the core portion. */
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if (core_size > 0) {
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R_TRY(base_storage->Read(core_offset, aligned_core_buffer, core_size));
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if (offset_gap != 0 || buffer_gap != 0) {
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std::memmove(aligned_core_buffer - buffer_gap, aligned_core_buffer + offset_gap, core_size - offset_gap);
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core_size -= offset_gap;
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}
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}
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/* Handle the head portion. */
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if (offset < covered_offset) {
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const s64 head_offset = util::AlignDown(offset, data_alignment);
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const size_t head_size = static_cast<size_t>(covered_offset - offset);
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AMS_ASSERT(GetRoundDownDifference(offset, data_alignment) + head_size <= work_buf_size);
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R_TRY(base_storage->Read(head_offset, work_buf, data_alignment));
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std::memcpy(buffer, work_buf + GetRoundDownDifference(offset, data_alignment), head_size);
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}
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/* Handle the tail portion. */
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s64 tail_offset = covered_offset + core_size;
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size_t remaining_tail_size = static_cast<size_t>((offset + size) - tail_offset);
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while (remaining_tail_size > 0) {
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const auto aligned_tail_offset = util::AlignDown(tail_offset, data_alignment);
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const auto cur_size = std::min(static_cast<size_t>(aligned_tail_offset + data_alignment - tail_offset), remaining_tail_size);
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R_TRY(base_storage->Read(aligned_tail_offset, work_buf, data_alignment));
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AMS_ASSERT((tail_offset - offset) + cur_size <= size);
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AMS_ASSERT((tail_offset - aligned_tail_offset) + cur_size <= data_alignment);
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std::memcpy(static_cast<char *>(buffer) + (tail_offset - offset), work_buf + (tail_offset - aligned_tail_offset), cur_size);
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remaining_tail_size -= cur_size;
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tail_offset += cur_size;
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}
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R_SUCCEED();
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}
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Result AlignmentMatchingStorageImpl::Write(fs::IStorage *base_storage, char *work_buf, size_t work_buf_size, size_t data_alignment, size_t buffer_alignment, s64 offset, const char *buffer, size_t size) {
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/* Check preconditions. */
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AMS_ASSERT(work_buf_size >= data_alignment);
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AMS_UNUSED(work_buf_size);
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/* Succeed if zero size. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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/* Determine extents. */
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const char *aligned_core_buffer;
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s64 core_offset;
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size_t core_size;
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s64 covered_offset;
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const size_t offset_round_up_difference = GetRoundUpDifference(offset, data_alignment);
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if (util::IsAligned(reinterpret_cast<uintptr_t>(buffer) + offset_round_up_difference, buffer_alignment)) {
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aligned_core_buffer = buffer + offset_round_up_difference;
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core_offset = util::AlignUp(offset, data_alignment);
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core_size = (size < offset_round_up_difference) ? 0 : util::AlignDown(size - offset_round_up_difference, data_alignment);
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covered_offset = core_size > 0 ? core_offset : offset;
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} else {
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aligned_core_buffer = nullptr;
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core_offset = util::AlignDown(offset, data_alignment);
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core_size = 0;
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covered_offset = offset;
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}
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/* Write the core portion. */
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if (core_size > 0) {
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R_TRY(base_storage->Write(core_offset, aligned_core_buffer, core_size));
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}
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/* Handle the head portion. */
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if (offset < covered_offset) {
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const s64 head_offset = util::AlignDown(offset, data_alignment);
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const size_t head_size = static_cast<size_t>(covered_offset - offset);
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AMS_ASSERT((offset - head_offset) + head_size <= data_alignment);
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R_TRY(base_storage->Read(head_offset, work_buf, data_alignment));
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std::memcpy(work_buf + (offset - head_offset), buffer, head_size);
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R_TRY(base_storage->Write(head_offset, work_buf, data_alignment));
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}
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/* Handle the tail portion. */
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s64 tail_offset = covered_offset + core_size;
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size_t remaining_tail_size = static_cast<size_t>((offset + size) - tail_offset);
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while (remaining_tail_size > 0) {
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AMS_ASSERT(static_cast<size_t>(tail_offset - offset) < size);
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const auto aligned_tail_offset = util::AlignDown(tail_offset, data_alignment);
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const auto cur_size = std::min(static_cast<size_t>(aligned_tail_offset + data_alignment - tail_offset), remaining_tail_size);
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R_TRY(base_storage->Read(aligned_tail_offset, work_buf, data_alignment));
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std::memcpy(work_buf + GetRoundDownDifference(tail_offset, data_alignment), buffer + (tail_offset - offset), cur_size);
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R_TRY(base_storage->Write(aligned_tail_offset, work_buf, data_alignment));
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remaining_tail_size -= cur_size;
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tail_offset += cur_size;
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}
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R_SUCCEED();
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}
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template<>
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Result AlignmentMatchingStorageInBulkRead<1>::Read(s64 offset, void *buffer, size_t size) {
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/* Succeed if zero size. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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s64 bs_size = 0;
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R_TRY(this->GetSize(std::addressof(bs_size)));
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R_TRY(fs::IStorage::CheckAccessRange(offset, size, bs_size));
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/* Determine extents. */
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const auto offset_end = offset + static_cast<s64>(size);
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const auto aligned_offset = util::AlignDown(offset, m_data_align);
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const auto aligned_offset_end = util::AlignUp(offset_end, m_data_align);
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const auto aligned_size = static_cast<size_t>(aligned_offset_end - aligned_offset);
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/* If we aren't aligned, we need to allocate a buffer. */
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PooledBuffer pooled_buffer;
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if (aligned_offset != offset || aligned_size != size) {
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if (aligned_size <= pooled_buffer.GetAllocatableSizeMax()) {
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pooled_buffer.Allocate(aligned_size, m_data_align);
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if (aligned_size <= pooled_buffer.GetSize()) {
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R_TRY(m_base_storage->Read(aligned_offset, pooled_buffer.GetBuffer(), aligned_size));
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std::memcpy(buffer, pooled_buffer.GetBuffer() + (offset - aligned_offset), size);
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R_SUCCEED();
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} else {
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pooled_buffer.Shrink(m_data_align);
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}
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} else {
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pooled_buffer.Allocate(m_data_align, m_data_align);
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}
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AMS_ASSERT(pooled_buffer.GetSize() >= static_cast<size_t>(m_data_align));
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}
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/* Determine read extents for the aligned portion. */
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const auto core_offset = util::AlignUp(offset, m_data_align);
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const auto core_offset_end = util::AlignDown(offset_end, m_data_align);
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/* Handle any data before the aligned portion. */
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if (offset < core_offset) {
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const auto head_size = static_cast<size_t>(core_offset - offset);
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AMS_ASSERT(head_size < size);
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R_TRY(m_base_storage->Read(aligned_offset, pooled_buffer.GetBuffer(), m_data_align));
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std::memcpy(buffer, pooled_buffer.GetBuffer() + (offset - aligned_offset), head_size);
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}
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/* Handle the aligned portion. */
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if (core_offset < core_offset_end) {
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const auto core_buffer = static_cast<char *>(buffer) + (core_offset - offset);
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const auto core_size = static_cast<size_t>(core_offset_end - core_offset);
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R_TRY(m_base_storage->Read(core_offset, core_buffer, core_size));
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}
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/* Handle any data after the aligned portion. */
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if (core_offset_end < offset_end) {
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const auto tail_buffer = static_cast<char *>(buffer) + (core_offset_end - offset);
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const auto tail_size = static_cast<size_t>(offset_end - core_offset_end);
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R_TRY(m_base_storage->Read(core_offset_end, pooled_buffer.GetBuffer(), m_data_align));
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std::memcpy(tail_buffer, pooled_buffer.GetBuffer(), tail_size);
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}
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R_SUCCEED();
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}
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}
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