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Code Issues Releases Activity

fs: add extension GetEntryList to AesCtrCounterExtendedStorage

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This commit is contained in:
Michael Scire 2022-06-11 16:54:02 -07:00
parent ea7f51a279
commit d75f9bbedf
2 changed files with 63 additions and 1 deletions
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2
libraries/libstratosphere/include/stratosphere/fssystem/fssystem_aes_ctr_counter_extended_storage.hpp
View file

@ -123,6 +123,8 @@ namespace ams::fssystem {
AMS_UNUSED(size);
R_THROW(fs::ResultUnsupportedSetSizeForAesCtrCounterExtendedStorage());
}
Result GetEntryList(Entry *out_entries, s32 *out_entry_count, s32 entry_count, s64 offset, s64 size);
private:
Result Initialize(IAllocator *allocator, const void *key, size_t key_size, u32 secure_value, fs::SubStorage data_storage, fs::SubStorage table_storage);
};

62
libraries/libstratosphere/source/fssystem/fssystem_aes_ctr_counter_extended_storage.cpp
View file

@ -110,6 +110,66 @@ namespace ams::fssystem {
}
}
Result AesCtrCounterExtendedStorage::GetEntryList(Entry *out_entries, s32 *out_entry_count, s32 entry_count, s64 offset, s64 size) {
/* Validate pre-conditions. */
AMS_ASSERT(offset >= 0);
AMS_ASSERT(size >= 0);
AMS_ASSERT(this->IsInitialized());
/* Clear the out count. */
R_UNLESS(out_entry_count != nullptr, fs::ResultNullptrArgument());
*out_entry_count = 0;
/* Succeed if there's no range. */
R_SUCCEED_IF(size == 0);
/* If we have an output array, we need it to be non-null. */
R_UNLESS(out_entries != nullptr || entry_count == 0, fs::ResultNullptrArgument());
/* Check that our range is valid. */
BucketTree::Offsets table_offsets;
R_TRY(m_table.GetOffsets(std::addressof(table_offsets)));
R_UNLESS(table_offsets.IsInclude(offset, size), fs::ResultOutOfRange());
/* Find the offset in our tree. */
BucketTree::Visitor visitor;
R_TRY(m_table.Find(std::addressof(visitor), offset));
{
const auto entry_offset = visitor.Get<Entry>()->GetOffset();
R_UNLESS(0 <= entry_offset && table_offsets.IsInclude(entry_offset), fs::ResultInvalidAesCtrCounterExtendedEntryOffset());
}
/* Prepare to loop over entries. */
const auto end_offset = offset + static_cast<s64>(size);
s32 count = 0;
auto cur_entry = *visitor.Get<Entry>();
while (cur_entry.GetOffset() < end_offset) {
/* Try to write the entry to the out list */
if (entry_count != 0) {
if (count >= entry_count) {
break;
}
std::memcpy(out_entries + count, std::addressof(cur_entry), sizeof(Entry));
}
count++;
/* Advance. */
if (visitor.CanMoveNext()) {
R_TRY(visitor.MoveNext());
cur_entry = *visitor.Get<Entry>();
} else {
break;
}
}
/* Write the output count. */
*out_entry_count = count;
R_SUCCEED();
}
Result AesCtrCounterExtendedStorage::Read(s64 offset, void *buffer, size_t size) {
/* Validate preconditions. */
AMS_ASSERT(offset >= 0);
@ -126,7 +186,7 @@ namespace ams::fssystem {
BucketTree::Offsets table_offsets;
R_TRY(m_table.GetOffsets(std::addressof(table_offsets)));
R_UNLESS(table_offsets.IsInclude(offset, size), fs::ResultOutOfRange());
R_UNLESS(table_offsets.IsInclude(offset, size), fs::ResultOutOfRange());
/* Read the data. */
R_TRY(m_data_storage.Read(offset, buffer, size));