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335cf4f2db
A deep-copy method CopyReader has been added to BlobReader (virtual) and all of its subclasses (override). This should create a second BlobReader to open the same set of data but with an independent read pointer so that it doesn't interfere with any reads done on the original Reader. As part of this, IOFile has added code to create a deep copy IOFile pointer onto the same file, with code based on the platform in question to find the file ID from the file pointer and open a new one. There has also been a small piece added to FileInfo to enable a deep copy, but its only subclass at this time already had a copy constructor so this was relatively minor.
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
// Copyright 2020 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "DiscIO/ScrubbedBlob.h"
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#include <algorithm>
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#include <memory>
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#include <string>
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#include <utility>
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#include "Common/Align.h"
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#include "DiscIO/Blob.h"
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#include "DiscIO/DiscScrubber.h"
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#include "DiscIO/VolumeDisc.h"
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namespace DiscIO
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{
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ScrubbedBlob::ScrubbedBlob(std::unique_ptr<BlobReader> blob_reader, DiscScrubber scrubber)
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: m_blob_reader(std::move(blob_reader)), m_scrubber(std::move(scrubber))
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{
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}
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std::unique_ptr<ScrubbedBlob> ScrubbedBlob::Create(const std::string& path)
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{
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std::unique_ptr<VolumeDisc> disc = CreateDisc(path);
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if (!disc)
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return nullptr;
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DiscScrubber scrubber;
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if (!scrubber.SetupScrub(*disc))
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return nullptr;
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std::unique_ptr<BlobReader> blob = CreateBlobReader(path);
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if (!blob)
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return nullptr;
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return std::unique_ptr<ScrubbedBlob>(new ScrubbedBlob(std::move(blob), std::move(scrubber)));
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}
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std::unique_ptr<BlobReader> ScrubbedBlob::CopyReader() const
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{
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return std::unique_ptr<ScrubbedBlob>(new ScrubbedBlob(m_blob_reader->CopyReader(), m_scrubber));
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}
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bool ScrubbedBlob::Read(u64 offset, u64 size, u8* out_ptr)
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{
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while (size > 0)
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{
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constexpr size_t CLUSTER_SIZE = DiscScrubber::CLUSTER_SIZE;
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const u64 bytes_to_read =
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std::min(Common::AlignDown(offset + CLUSTER_SIZE, CLUSTER_SIZE) - offset, size);
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if (m_scrubber.CanBlockBeScrubbed(offset))
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{
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std::fill_n(out_ptr, bytes_to_read, 0);
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}
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else
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{
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if (!m_blob_reader->Read(offset, bytes_to_read, out_ptr))
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return false;
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}
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offset += bytes_to_read;
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size -= bytes_to_read;
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out_ptr += bytes_to_read;
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}
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return true;
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}
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} // namespace DiscIO
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