DiscIO: Move parts of Filesystem to the new file DiscExtractor

1 files changed, 174 insertions, 0 deletions

diff --git a/Source/Core/DiscIO/DiscExtractor.cpp b/Source/Core/DiscIO/DiscExtractor.cpp
new file mode 100644
index 0000000000..403e6f6d0a
--- /dev/null
+++ b/Source/Core/DiscIO/DiscExtractor.cpp
@@ -0,0 +1,174 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DiscIO/DiscExtractor.h"
+
+#include <algorithm>
+#include <cinttypes>
+#include <optional>
+
+#include "Common/CommonTypes.h"
+#include "DiscIO/Enums.h"
+#include "DiscIO/Filesystem.h"
+#include "DiscIO/Volume.h"
+
+namespace DiscIO
+{
+u64 ReadFile(const Volume& volume, const Partition& partition, const FileInfo* file_info,
+             u8* buffer, u64 max_buffer_size, u64 offset_in_file)
+{
+  if (!file_info || file_info->IsDirectory())
+    return 0;
+
+  if (offset_in_file >= file_info->GetSize())
+    return 0;
+
+  u64 read_length = std::min(max_buffer_size, file_info->GetSize() - offset_in_file);
+
+  DEBUG_LOG(DISCIO, "Reading %" PRIx64 " bytes at %" PRIx64 " from file %s. Offset: %" PRIx64
+                    " Size: %" PRIx32,
+            read_length, offset_in_file, file_info->GetPath().c_str(), file_info->GetOffset(),
+            file_info->GetSize());
+
+  volume.Read(file_info->GetOffset() + offset_in_file, read_length, buffer, partition);
+
+  return read_length;
+}
+
+bool ExportFile(const Volume& volume, const Partition& partition, const FileInfo* file_info,
+                const std::string& export_filename)
+{
+  if (!file_info || file_info->IsDirectory())
+    return false;
+
+  u64 remaining_size = file_info->GetSize();
+  u64 file_offset = file_info->GetOffset();
+
+  File::IOFile f(export_filename, "wb");
+  if (!f)
+    return false;
+
+  bool result = true;
+
+  while (remaining_size)
+  {
+    // Limit read size to 128 MB
+    size_t read_size = (size_t)std::min(remaining_size, (u64)0x08000000);
+
+    std::vector<u8> buffer(read_size);
+
+    result = volume.Read(file_offset, read_size, &buffer[0], partition);
+
+    if (!result)
+      break;
+
+    f.WriteBytes(&buffer[0], read_size);
+
+    remaining_size -= read_size;
+    file_offset += read_size;
+  }
+
+  return result;
+}
+
+bool ExportApploader(const Volume& volume, const Partition& partition,
+                     const std::string& export_folder)
+{
+  if (!IsDisc(volume.GetVolumeType()))
+    return false;
+
+  std::optional<u32> apploader_size = volume.ReadSwapped<u32>(0x2440 + 0x14, partition);
+  const std::optional<u32> trailer_size = volume.ReadSwapped<u32>(0x2440 + 0x18, partition);
+  constexpr u32 header_size = 0x20;
+  if (!apploader_size || !trailer_size)
+    return false;
+  *apploader_size += *trailer_size + header_size;
+  DEBUG_LOG(DISCIO, "Apploader size -> %x", *apploader_size);
+
+  std::vector<u8> buffer(*apploader_size);
+  if (volume.Read(0x2440, *apploader_size, buffer.data(), partition))
+  {
+    std::string export_name(export_folder + "/apploader.img");
+
+    File::IOFile apploader_file(export_name, "wb");
+    if (apploader_file)
+    {
+      apploader_file.WriteBytes(buffer.data(), *apploader_size);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+std::optional<u64> GetBootDOLOffset(const Volume& volume, const Partition& partition)
+{
+  const Platform volume_type = volume.GetVolumeType();
+  if (!IsDisc(volume_type))
+    return {};
+
+  std::optional<u32> offset = volume.ReadSwapped<u32>(0x420, partition);
+  const u8 offset_shift = volume_type == Platform::WII_DISC ? 2 : 0;
+  return offset ? static_cast<u64>(*offset) << offset_shift : std::optional<u64>();
+}
+
+std::optional<u32> GetBootDOLSize(const Volume& volume, const Partition& partition, u64 dol_offset)
+{
+  if (!IsDisc(volume.GetVolumeType()))
+    return {};
+
+  u32 dol_size = 0;
+
+  // Iterate through the 7 code segments
+  for (u8 i = 0; i < 7; i++)
+  {
+    const std::optional<u32> offset = volume.ReadSwapped<u32>(dol_offset + 0x00 + i * 4, partition);
+    const std::optional<u32> size = volume.ReadSwapped<u32>(dol_offset + 0x90 + i * 4, partition);
+    if (!offset || !size)
+      return {};
+    dol_size = std::max(*offset + *size, dol_size);
+  }
+
+  // Iterate through the 11 data segments
+  for (u8 i = 0; i < 11; i++)
+  {
+    const std::optional<u32> offset = volume.ReadSwapped<u32>(dol_offset + 0x1c + i * 4, partition);
+    const std::optional<u32> size = volume.ReadSwapped<u32>(dol_offset + 0xac + i * 4, partition);
+    if (!offset || !size)
+      return {};
+    dol_size = std::max(*offset + *size, dol_size);
+  }
+
+  return dol_size;
+}
+
+bool ExportDOL(const Volume& volume, const Partition& partition, const std::string& export_folder)
+{
+  if (!IsDisc(volume.GetVolumeType()))
+    return false;
+
+  std::optional<u64> dol_offset = GetBootDOLOffset(volume, partition);
+  if (!dol_offset)
+    return false;
+  std::optional<u32> dol_size = GetBootDOLSize(volume, partition, *dol_offset);
+  if (!dol_size)
+    return false;
+
+  std::vector<u8> buffer(*dol_size);
+  if (volume.Read(*dol_offset, *dol_size, buffer.data(), partition))
+  {
+    std::string export_name(export_folder + "/boot.dol");
+
+    File::IOFile dol_file(export_name, "wb");
+    if (dol_file)
+    {
+      dol_file.WriteBytes(&buffer[0], *dol_size);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+}  // namespace DiscIO