1 files changed, 77 insertions, 0 deletions
diff --git a/Source/Core/DiscIO/FileBlob.cpp b/Source/Core/DiscIO/FileBlob.cpp
index 9e0486d969..ca0aa2cfd0 100644
--- a/Source/Core/DiscIO/FileBlob.cpp
+++ b/Source/Core/DiscIO/FileBlob.cpp
@@ -2,10 +2,15 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <algorithm>
 #include <memory>
 #include <string>
 #include <utility>
+#include <vector>
 
+#include "Common/Assert.h"
+#include "Common/FileUtil.h"
+#include "Common/MsgHandler.h"
 #include "DiscIO/FileBlob.h"
 
 namespace DiscIO
@@ -36,4 +41,76 @@ bool PlainFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
   }
 }
 
+bool ConvertToPlain(BlobReader* infile, const std::string& infile_path,
+                    const std::string& outfile_path, CompressCB callback, void* arg)
+{
+  ASSERT(infile->IsDataSizeAccurate());
+
+  File::IOFile outfile(outfile_path, "wb");
+  if (!outfile)
+  {
+    PanicAlertT("Failed to open the output file \"%s\".\n"
+                "Check that you have permissions to write the target folder and that the media can "
+                "be written.",
+                outfile_path.c_str());
+    return false;
+  }
+
+  constexpr size_t DESIRED_BUFFER_SIZE = 0x80000;
+  u64 buffer_size = infile->GetBlockSize();
+  if (buffer_size == 0)
+  {
+    buffer_size = DESIRED_BUFFER_SIZE;
+  }
+  else
+  {
+    while (buffer_size < DESIRED_BUFFER_SIZE)
+      buffer_size *= 2;
+  }
+
+  std::vector<u8> buffer(buffer_size);
+  const u64 num_buffers = (infile->GetDataSize() + buffer_size - 1) / buffer_size;
+  int progress_monitor = std::max<int>(1, num_buffers / 100);
+  bool success = true;
+
+  for (u64 i = 0; i < num_buffers; i++)
+  {
+    if (i % progress_monitor == 0)
+    {
+      const bool was_cancelled =
+          !callback(Common::GetStringT("Unpacking"), (float)i / (float)num_buffers, arg);
+      if (was_cancelled)
+      {
+        success = false;
+        break;
+      }
+    }
+    const u64 inpos = i * buffer_size;
+    const u64 sz = std::min(buffer_size, infile->GetDataSize() - inpos);
+    if (!infile->Read(inpos, sz, buffer.data()))
+    {
+      PanicAlertT("Failed to read from the input file \"%s\".", infile_path.c_str());
+      success = false;
+      break;
+    }
+    if (!outfile.WriteBytes(buffer.data(), sz))
+    {
+      PanicAlertT("Failed to write the output file \"%s\".\n"
+                  "Check that you have enough space available on the target drive.",
+                  outfile_path.c_str());
+      success = false;
+      break;
+    }
+  }
+
+  if (!success)
+  {
+    // Remove the incomplete output file.
+    outfile.Close();
+    File::Delete(outfile_path);
+  }
+
+  return success;
+}
+
 }  // namespace DiscIO