dolphin/Source/Core/DiscIO/ScrubbedBlob.cpp

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// Copyright 2020 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "DiscIO/ScrubbedBlob.h"
#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include "Common/Align.h"
#include "DiscIO/Blob.h"
#include "DiscIO/DiscScrubber.h"
#include "DiscIO/Volume.h"
namespace DiscIO
{
ScrubbedBlob::ScrubbedBlob(std::unique_ptr<BlobReader> blob_reader, DiscScrubber scrubber)
: m_blob_reader(std::move(blob_reader)), m_scrubber(std::move(scrubber))
{
}
std::unique_ptr<ScrubbedBlob> ScrubbedBlob::Create(const std::string& path)
{
std::unique_ptr<VolumeDisc> disc = CreateDisc(path);
if (!disc)
return nullptr;
DiscScrubber scrubber;
if (!scrubber.SetupScrub(disc.get()))
return nullptr;
std::unique_ptr<BlobReader> blob = CreateBlobReader(path);
if (!blob)
return nullptr;
return std::unique_ptr<ScrubbedBlob>(new ScrubbedBlob(std::move(blob), std::move(scrubber)));
}
bool ScrubbedBlob::Read(u64 offset, u64 size, u8* out_ptr)
{
while (size > 0)
{
constexpr size_t CLUSTER_SIZE = DiscScrubber::CLUSTER_SIZE;
const u64 bytes_to_read =
std::min(Common::AlignDown(offset + CLUSTER_SIZE, CLUSTER_SIZE) - offset, size);
if (m_scrubber.CanBlockBeScrubbed(offset))
{
std::fill_n(out_ptr, bytes_to_read, 0);
}
else
{
if (!m_blob_reader->Read(offset, bytes_to_read, out_ptr))
return false;
}
offset += bytes_to_read;
size -= bytes_to_read;
out_ptr += bytes_to_read;
}
return true;
}
} // namespace DiscIO