[VFS] Add VFS dump tool (supporting STFS only as of now)

src/xenia/vfs/vfs_dump.cc

@@ -0,0 +1,111 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include <queue>
+#include <string>
+#include <vector>
+
+#include "xenia/base/logging.h"
+#include "xenia/base/main.h"
+#include "xenia/base/math.h"
+
+#include "xenia/vfs/devices/stfs_container_device.h"
+#include "xenia/vfs/file.h"
+
+namespace xe {
+namespace vfs {
+
+int vfs_dump_main(const std::vector<std::wstring>& args) {
+  if (args.size() <= 2) {
+    XELOGE("Usage: %s [source] [dump_path]", args[0].c_str());
+    return 1;
+  }
+
+  std::wstring base_path = args[2];
+  std::unique_ptr<vfs::Device> device;
+
+  // TODO: Flags specifying the type of device.
+  device = std::make_unique<vfs::StfsContainerDevice>("", args[1]);
+  if (!device->Initialize()) {
+    XELOGE("Failed to initialize device");
+    return 1;
+  }
+
+  // Run through all the files, breadth-first style.
+  std::queue<vfs::Entry*> queue;
+  auto root = device->ResolvePath("/");
+  queue.push(root);
+
+  // Allocate a buffer when needed.
+  size_t buffer_size = 0;
+  uint8_t* buffer = nullptr;
+
+  while (!queue.empty()) {
+    auto entry = queue.front();
+    queue.pop();
+    for (auto& entry : entry->children()) {
+      queue.push(entry.get());
+    }
+
+    XELOGI("%s", entry->path().c_str());
+    auto dest_name = xe::join_paths(base_path, xe::to_wstring(entry->path()));
+    if (entry->attributes() & kFileAttributeDirectory) {
+      xe::filesystem::CreateFolder(dest_name + L"\\");
+      continue;
+    }
+
+    vfs::File* in_file = nullptr;
+    if (entry->Open(FileAccess::kFileReadData, &in_file) != X_STATUS_SUCCESS) {
+      continue;
+    }
+
+    auto file = xe::filesystem::OpenFile(dest_name, "wb");
+    if (!file) {
+      in_file->Destroy();
+      continue;
+    }
+
+    if (entry->can_map()) {
+      auto map = entry->OpenMapped(xe::MappedMemory::Mode::kRead);
+      fwrite(map->data(), map->size(), 1, file);
+      map->Close();
+    } else {
+      // Can't map the file into memory. Read it into a temporary buffer.
+      if (!buffer || entry->size() > buffer_size) {
+        // Resize the buffer.
+        if (buffer) {
+          delete[] buffer;
+        }
+
+        // Allocate a buffer rounded up to the nearest 512MB.
+        buffer_size = xe::round_up(entry->size(), 512 * 1024 * 1024);
+        buffer = new uint8_t[buffer_size];
+      }
+
+      size_t bytes_read = 0;
+      in_file->ReadSync(buffer, entry->size(), 0, &bytes_read);
+      fwrite(buffer, bytes_read, 1, file);
+    }
+
+    fclose(file);
+    in_file->Destroy();
+  }
+
+  if (buffer) {
+    delete[] buffer;
+  }
+
+  return 0;
+}
+
+}  // namespace vfs
+}  // namespace xe
+
+DEFINE_ENTRY_POINT(L"xenia-vfs-dump", L"xenia-vfs-dump",
+                   xe::vfs::vfs_dump_main);