Find correct launch module for XNA-based games

Added utility to parse game information and updated launch logic to use
it

src/xenia/kernel/util/gameinfo_utils.cc

@@ -0,0 +1,82 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2016 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/kernel/util/gameinfo_utils.h"
+
+namespace xe {
+namespace kernel {
+namespace util {
+
+constexpr uint32_t kGameInfoExecMagic = 'EXEC';
+constexpr uint32_t kGameInfoCommMagic = 'COMM';
+constexpr uint32_t kGameInfoTitlMagic = 'TITL';
+
+GameInfoWrapper::GameInfoWrapper(const uint8_t *data, size_t data_size)
+    : data_(data), data_size_(data_size) {
+  if (!data) {
+    return;
+  }
+
+  const GameInfoBlockHeader *block_header(nullptr);
+  size_t data_offset(0);
+  while (data_offset < data_size_) {
+    block_header =
+        reinterpret_cast<const GameInfoBlockHeader *>(data_ + data_offset);
+    data_offset += sizeof(GameInfoBlockHeader);
+
+    switch (block_header->magic) {
+    case kGameInfoExecMagic:
+      exec_.virtual_titleid =
+          reinterpret_cast<const char *>(data_ + data_offset);
+      data_offset += exec_.VirtualTitleIdLength + 1;
+      exec_.module_name = reinterpret_cast<const char *>(data_ + data_offset);
+      data_offset += exec_.ModuleNameLength + 1;
+      exec_.build_description =
+          reinterpret_cast<const char *>(data_ + data_offset);
+      data_offset += exec_.BuildDescriptionLength + 1;
+      break;
+    case kGameInfoCommMagic:
+      assert_true(block_header->block_size == sizeof(GameInfoBlockComm));
+      comm_ = reinterpret_cast<const GameInfoBlockComm *>(data_ + data_offset);
+      data_offset += block_header->block_size;
+      break;
+    case kGameInfoTitlMagic:
+      assert_true(block_header->block_size == sizeof(GameInfoBlockTitl));
+      titl_ = reinterpret_cast<const GameInfoBlockTitl *>(data_ + data_offset);
+      data_offset += block_header->block_size;
+      break;
+    default:
+      // Unsupported headers
+      data_ = nullptr;
+      return;
+    }
+  }
+
+  if ((comm_ == nullptr) || (titl_ == nullptr) ||
+      (exec_.virtual_titleid == nullptr)) {
+    data_ = nullptr;
+  }
+}
+
+uint32_t GameInfo::title_id() const { return comm_->title_id; }
+
+std::string GameInfo::virtual_title_id() const {
+  size_t virtual_titleid_length(std::strlen(exec_.virtual_titleid));
+  return std::string(exec_.virtual_titleid,
+                     exec_.virtual_titleid + virtual_titleid_length);
+}
+
+std::string GameInfo::module_name() const {
+  size_t module_name_length(std::strlen(exec_.module_name));
+  return std::string(exec_.module_name, exec_.module_name + module_name_length);
+}
+
+} // namespace util
+} // namespace kernel
+} // namespace xe