Added a way to check Block Size, Compression Method, and Compression Level flags to dolphin-tool

New dolphin-tool command: "header"
-b / --block_size
-c / --compression
-l / --compression_level

Informative RVZ/WIA header2 value "compression_level" is now a s32 instead of a u32, because negative compression is a thing.

Speaking of, it is now possible to use negative compression levels in dolphin-tool's convert command (not the GUI, though).

Source/Core/DolphinTool/HeaderCommand.cpp

@@ -0,0 +1,106 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinTool/HeaderCommand.h"
+#include "DiscIO/Blob.h"
+#include "DiscIO/Volume.h"
+#include "DiscIO/VolumeDisc.h"
+
+#include <OptionParser.h>
+#include <optional>
+
+namespace DolphinTool
+{
+int HeaderCommand::Main(const std::vector<std::string>& args)
+{
+  auto parser = std::make_unique<optparse::OptionParser>();
+
+  parser->usage("usage: header [options]...");
+
+  parser->add_option("-i", "--input")
+      .type("string")
+      .action("store")
+      .help("Path to disc image FILE.")
+      .metavar("FILE");
+
+  parser->add_option("-b", "--block_size")
+      .action("store_true")
+      .help("Optional. Print the block size of GCZ/WIA/RVZ formats, then exit.");
+
+  parser->add_option("-c", "--compression")
+      .action("store_true")
+      .help("Optional. Print the compression method of GCZ/WIA/RVZ formats, then exit.");
+
+  parser->add_option("-l", "--compression_level")
+      .action("store_true")
+      .help("Optional. Print the level of compression for WIA/RVZ formats, then exit.");
+
+  const optparse::Values& options = parser->parse_args(args);
+
+  // Validate options
+  const std::string input_file_path = static_cast<const char*>(options.get("input"));
+  if (input_file_path.empty())
+  {
+    std::cerr << "Error: No input set" << std::endl;
+    return 1;
+  }
+
+  bool enable_block_size = options.is_set_by_user("block_size");
+  bool enable_compression_method = options.is_set_by_user("compression");
+  bool enable_compression_level = options.is_set_by_user("compression_level");
+
+  // Open the blob reader, plus get blob type
+  std::shared_ptr<DiscIO::BlobReader> blob_reader = DiscIO::CreateBlobReader(input_file_path);
+  if (!blob_reader)
+  {
+    std::cerr << "Error: Unable to open disc image" << std::endl;
+    return 1;
+  }
+  const DiscIO::BlobType blob_type = blob_reader->GetBlobType();
+
+  if (enable_block_size || enable_compression_method || enable_compression_level)
+  {
+    if (enable_block_size)
+    {
+      const auto block_size = blob_reader->GetBlockSize();
+      if (block_size == 0)
+        std::cout << "N/A" << std::endl;
+      else
+        std::cout << block_size << std::endl;
+    }
+    if (enable_compression_method)
+    {
+      const auto compression_method = blob_reader->GetCompressionMethod();
+      if (compression_method == "")
+        std::cout << "N/A" << std::endl;
+      else
+        std::cout << compression_method << std::endl;
+    }
+    if (enable_compression_level)
+    {
+      const auto compression_level_o = blob_reader->GetCompressionLevel();
+      if (compression_level_o == std::nullopt)
+        std::cout << "N/A" << std::endl;
+      else
+        std::cout << compression_level_o.value() << std::endl;
+    }
+  }
+  else
+  {
+    if (blob_type == DiscIO::BlobType::GCZ)
+    {
+      std::cout << "Block Size: " << blob_reader->GetBlockSize() << std::endl;
+      std::cout << "Compression Method: " << blob_reader->GetCompressionMethod() << std::endl;
+    }
+    if (blob_type == DiscIO::BlobType::WIA || blob_type == DiscIO::BlobType::RVZ)
+    {
+      std::cout << "Block Size: " << blob_reader->GetBlockSize() << std::endl;
+      std::cout << "Compression Method: " << blob_reader->GetCompressionMethod() << std::endl;
+      std::cout << "Compression Level: " << blob_reader->GetCompressionLevel().value() << std::endl;
+    }
+  }
+
+  return 0;
+}
+
+}  // namespace DolphinTool