Add an early version of WIABlobReader

It can currently only read the first 0x80 bytes of a disc image,
which is enough for identifying it but not for doing anything else.

Source/Core/DiscIO/Blob.cpp

@@ -20,6 +20,7 @@
 #include "DiscIO/DriveBlob.h"
 #include "DiscIO/FileBlob.h"
 #include "DiscIO/TGCBlob.h"
+#include "DiscIO/WIABlob.h"
 #include "DiscIO/WbfsBlob.h"
 
 namespace DiscIO
@@ -205,6 +206,8 @@ std::unique_ptr<BlobReader> CreateBlobReader(const std::string& filename)
     return TGCFileReader::Create(std::move(file));
   case WBFS_MAGIC:
     return WbfsFileReader::Create(std::move(file), filename);
+  case WIA_MAGIC:
+    return WIAFileReader::Create(std::move(file), filename);
   default:
     if (auto directory_blob = DirectoryBlobReader::Create(filename))
       return std::move(directory_blob);

Source/Core/DiscIO/Blob.h

@@ -34,7 +34,8 @@ enum class BlobType
   GCZ,
   CISO,
   WBFS,
-  TGC
+  TGC,
+  WIA
 };
 
 class BlobReader

Source/Core/DiscIO/CMakeLists.txt

@@ -42,6 +42,8 @@ add_library(discio
   VolumeWii.h
   WbfsBlob.cpp
   WbfsBlob.h
+  WIABlob.cpp
+  WIABlob.h
   WiiEncryptionCache.cpp
   WiiEncryptionCache.h
   WiiSaveBanner.cpp

Source/Core/DiscIO/DiscIO.vcxproj

@@ -65,6 +65,7 @@
     <ClCompile Include="VolumeWad.cpp" />
     <ClCompile Include="VolumeWii.cpp" />
     <ClCompile Include="WbfsBlob.cpp" />
+    <ClCompile Include="WIABlob.cpp" />
     <ClCompile Include="WiiEncryptionCache.cpp" />
     <ClCompile Include="WiiSaveBanner.cpp" />
   </ItemGroup>
@@ -91,6 +92,7 @@
     <ClInclude Include="VolumeWad.h" />
     <ClInclude Include="VolumeWii.h" />
     <ClInclude Include="WbfsBlob.h" />
+    <ClInclude Include="WIABlob.h" />
     <ClInclude Include="WiiEncryptionCache.h" />
     <ClInclude Include="WiiSaveBanner.h" />
   </ItemGroup>

Source/Core/DiscIO/DiscIO.vcxproj.filters

@@ -90,6 +90,9 @@
     <ClCompile Include="ScrubbedBlob.cpp">
       <Filter>Volume\Blob</Filter>
     </ClCompile>
+    <ClCompile Include="WIABlob.cpp">
+      <Filter>Volume\Blob</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="DiscScrubber.h">
@@ -164,6 +167,9 @@
     <ClInclude Include="MultithreadedCompressor.h">
       <Filter>Volume\Blob</Filter>
     </ClInclude>
+    <ClInclude Include="WIABlob.h">
+      <Filter>Volume\Blob</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />

Source/Core/DiscIO/WIABlob.cpp

@@ -0,0 +1,92 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "DiscIO/WIABlob.h"
+
+#include <memory>
+
+#include "Common/CommonTypes.h"
+#include "Common/File.h"
+#include "Common/Logging/Log.h"
+#include "Common/StringUtil.h"
+#include "Common/Swap.h"
+
+#include "DiscIO/VolumeWii.h"
+
+namespace DiscIO
+{
+WIAFileReader::WIAFileReader(File::IOFile file, const std::string& path) : m_file(std::move(file))
+{
+  m_valid = Initialize(path);
+}
+
+WIAFileReader::~WIAFileReader() = default;
+
+bool WIAFileReader::Initialize(const std::string& path)
+{
+  if (!m_file.Seek(0, SEEK_SET) || !m_file.ReadArray(&m_header_1, 1))
+    return false;
+
+  if (m_header_1.magic != WIA_MAGIC)
+    return false;
+
+  const u32 version = Common::swap32(m_header_1.version);
+  const u32 version_compatible = Common::swap32(m_header_1.version_compatible);
+  if (WIA_VERSION < version_compatible || WIA_VERSION_READ_COMPATIBLE > version)
+  {
+    ERROR_LOG(DISCIO, "Unsupported WIA version %s in %s", VersionToString(version).c_str(),
+              path.c_str());
+    return false;
+  }
+
+  if (Common::swap64(m_header_1.wia_file_size) != m_file.GetSize())
+  {
+    ERROR_LOG(DISCIO, "File size is incorrect for %s", path.c_str());
+    return false;
+  }
+
+  if (Common::swap32(m_header_1.header_2_size) < sizeof(WIAHeader2))
+    return false;
+
+  if (!m_file.ReadArray(&m_header_2, 1))
+    return false;
+
+  const u32 chunk_size = Common::swap32(m_header_2.chunk_size);
+  if (chunk_size % VolumeWii::GROUP_TOTAL_SIZE != 0)
+    return false;
+
+  return true;
+}
+
+std::unique_ptr<WIAFileReader> WIAFileReader::Create(File::IOFile file, const std::string& path)
+{
+  std::unique_ptr<WIAFileReader> blob(new WIAFileReader(std::move(file), path));
+  return blob->m_valid ? std::move(blob) : nullptr;
+}
+
+bool WIAFileReader::Read(u64 offset, u64 size, u8* out_ptr)
+{
+  if (offset + size <= sizeof(WIAHeader2::disc_header))
+  {
+    std::memcpy(out_ptr, m_header_2.disc_header.data() + offset, size);
+    return true;
+  }
+
+  // Not implemented
+  return false;
+}
+
+std::string WIAFileReader::VersionToString(u32 version)
+{
+  const u8 a = version >> 24;
+  const u8 b = (version >> 16) & 0xff;
+  const u8 c = (version >> 8) & 0xff;
+  const u8 d = version & 0xff;
+
+  if (d == 0 || d == 0xff)
+    return StringFromFormat("%u.%02x.%02x", a, b, c);
+  else
+    return StringFromFormat("%u.%02x.%02x.beta%u", a, b, c, d);
+}
+}  // namespace DiscIO

Source/Core/DiscIO/WIABlob.h

@@ -0,0 +1,102 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <memory>
+
+#include "Common/CommonTypes.h"
+#include "Common/File.h"
+#include "Common/Swap.h"
+#include "DiscIO/Blob.h"
+
+namespace DiscIO
+{
+constexpr u32 WIA_MAGIC = 0x01414957;  // "WIA\x1" (byteswapped to little endian)
+
+class WIAFileReader : public BlobReader
+{
+public:
+  ~WIAFileReader();
+
+  static std::unique_ptr<WIAFileReader> Create(File::IOFile file, const std::string& path);
+
+  BlobType GetBlobType() const override { return BlobType::WIA; }
+
+  u64 GetRawSize() const override { return Common::swap64(m_header_1.wia_file_size); }
+  u64 GetDataSize() const override { return Common::swap64(m_header_1.iso_file_size); }
+  bool IsDataSizeAccurate() const override { return true; }
+
+  u64 GetBlockSize() const override { return Common::swap32(m_header_2.chunk_size); }
+  bool HasFastRandomAccessInBlock() const override { return false; }
+
+  bool Read(u64 offset, u64 size, u8* out_ptr) override;
+
+private:
+  explicit WIAFileReader(File::IOFile file, const std::string& path);
+  bool Initialize(const std::string& path);
+
+  static std::string VersionToString(u32 version);
+
+  using SHA1 = std::array<u8, 20>;
+
+#pragma pack(push, 1)
+  struct WIAHeader1
+  {
+    u32 magic;
+    u32 version;
+    u32 version_compatible;
+    u32 header_2_size;
+    SHA1 header_2_hash;
+    u64 iso_file_size;
+    u64 wia_file_size;
+    SHA1 header_1_hash;
+  };
+#pragma pack(pop)
+  static_assert(sizeof(WIAHeader1) == 0x48, "Wrong size for WIA header 1");
+
+#pragma pack(push, 1)
+  struct WIAHeader2
+  {
+    u32 disc_type;
+    u32 compression_type;
+    u32 compression_level;  // Informative only
+    u32 chunk_size;
+
+    std::array<u8, 0x80> disc_header;
+
+    u32 number_of_partitions_entries;
+    u32 partition_entry_size;
+    u64 partition_entries_offset;
+    SHA1 partition_entries_hash;
+
+    u32 number_of_raw_data_entries;
+    u64 raw_data_entries_offset;
+    u32 raw_data_entries_size;
+
+    u32 number_of_group_entries;
+    u64 group_entries_offset;
+    u32 group_entries_size;
+  };
+#pragma pack(pop)
+  static_assert(sizeof(WIAHeader2) == 0xd4, "Wrong size for WIA header 2");
+
+  bool m_valid;
+
+  File::IOFile m_file;
+
+  WIAHeader1 m_header_1;
+  WIAHeader2 m_header_2;
+
+  static constexpr u32 WIA_VERSION = 0x01000000;
+  static constexpr u32 WIA_VERSION_WRITE_COMPATIBLE = 0x01000000;
+  static constexpr u32 WIA_VERSION_READ_COMPATIBLE = 0x00080000;
+
+  // Perhaps we could set WIA_VERSION_WRITE_COMPATIBLE to 0.9, but WIA version 0.9 was never in
+  // any official release of wit, and interim versions (either source or binaries) are hard to find.
+  // Since we've been unable to check if we're write compatible with 0.9, we set it 1.0 to be safe.
+};
+
+}  // namespace DiscIO