[Kernel] Added XLast Decompression

src/xenia/emulator.cc

@@ -118,6 +118,7 @@ Emulator::Emulator(const std::filesystem::path& command_line,
       kernel_state_(),
       main_thread_(),
       title_id_(std::nullopt),
+      title_xlast_(),
       paused_(false),
       restoring_(false),
       restore_fence_() {
@@ -1180,6 +1181,13 @@ X_STATUS Emulator::CompleteLaunch(const std::filesystem::path& path,
       XELOGI("-------------------- CONTEXTS --------------------\n{}",
              table.str());
 
+      uint32_t compressed_size, decompressed_size = 0;
+      const uint8_t* xlast_ptr =
+          db.ReadXLast(compressed_size, decompressed_size);
+
+      title_xlast_ =
+          kernel::util::XLast(xlast_ptr, compressed_size, decompressed_size);
+
       auto icon_block = db.icon();
       if (icon_block) {
         display_window_->SetIcon(icon_block.buffer, icon_block.size);

src/xenia/emulator.h

@@ -20,6 +20,7 @@
 #include "xenia/base/delegate.h"
 #include "xenia/base/exception_handler.h"
 #include "xenia/kernel/kernel_state.h"
+#include "xenia/kernel/util/xlast.h"
 #include "xenia/memory.h"
 #include "xenia/patcher/patcher.h"
 #include "xenia/patcher/plugin_loader.h"
@@ -298,6 +299,7 @@ class Emulator {
   kernel::object_ref<kernel::XThread> main_thread_;
   kernel::object_ref<kernel::XHostThread> plugin_loader_thread_;
   std::optional<uint32_t> title_id_;  // Currently running title ID
+  kernel::util::XLast title_xlast_;
 
   bool paused_;
   bool restoring_;

src/xenia/kernel/premake5.lua

@@ -9,6 +9,7 @@ project("xenia-kernel")
   links({
     "aes_128",
     "fmt",
+    "zlib",
     "xenia-apu",
     "xenia-base",
     "xenia-cpu",

src/xenia/kernel/util/xlast.cc

@@ -0,0 +1,84 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2024 Xenia Canary. All rights reserved.                          *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/kernel/util/xlast.h"
+#include "third_party/zlib/zlib.h"
+#include "xenia/base/filesystem.h"
+#include "xenia/base/logging.h"
+
+namespace xe {
+namespace kernel {
+namespace util {
+
+XLast::XLast() {}
+
+XLast::XLast(const uint8_t* compressed_xml_data,
+             const uint32_t compressed_data_size,
+             const uint32_t decompressed_data_size) {
+  if (!compressed_data_size || !decompressed_data_size) {
+    XELOGW("XLast: Current title don't have any XLast XML data!");
+    return;
+  }
+
+  xlast_decompressed_xml_.resize(decompressed_data_size);
+
+  z_stream stream;
+  stream.zalloc = Z_NULL;
+  stream.zfree = Z_NULL;
+  stream.opaque = Z_NULL;
+  stream.avail_in = 0;
+  stream.next_in = Z_NULL;
+
+  int ret = inflateInit2(
+      &stream, 16 + MAX_WBITS);  // 16 + MAX_WBITS enables gzip decoding
+  if (ret != Z_OK) {
+    XELOGE("XLast: Error during Zlib stream init");
+    return;
+  }
+
+  stream.avail_in = compressed_data_size;
+  stream.next_in =
+      reinterpret_cast<Bytef*>(const_cast<uint8_t*>(compressed_xml_data));
+  stream.avail_out = decompressed_data_size;
+  stream.next_out = reinterpret_cast<Bytef*>(xlast_decompressed_xml_.data());
+
+  ret = inflate(&stream, Z_NO_FLUSH);
+  if (ret == Z_STREAM_ERROR) {
+    XELOGE("XLast: Error during XLast decompression");
+    inflateEnd(&stream);
+    return;
+  }
+  inflateEnd(&stream);
+}
+
+XLast::~XLast() {}
+
+void XLast::Dump(std::string file_name) {
+  if (xlast_decompressed_xml_.empty()) {
+    return;
+  }
+
+  if (file_name.empty()) {
+    // TODO: Read default xlast name from it and use that one.
+  }
+
+  FILE* outfile =
+      xe::filesystem::OpenFile(fmt::format("{}.xml", file_name).c_str(), "ab");
+  if (!outfile) {
+    return;
+  }
+
+  fwrite(xlast_decompressed_xml_.data(), 1, xlast_decompressed_xml_.size(),
+         outfile);
+  fclose(outfile);
+}
+
+}  // namespace util
+}  // namespace kernel
+}  // namespace xe

src/xenia/kernel/util/xlast.h

@@ -0,0 +1,36 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2024 Xenia Canary. All rights reserved.                          *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_KERNEL_UTIL_XLAST_H_
+#define XENIA_KERNEL_UTIL_XLAST_H_
+
+#include <string>
+#include <vector>
+
+namespace xe {
+namespace kernel {
+namespace util {
+class XLast {
+ public:
+  XLast();
+  XLast(const uint8_t* compressed_xml_data, const uint32_t compressed_data_size,
+        const uint32_t decompressed_data_size);
+  ~XLast();
+
+  void Dump(std::string file_name);
+
+ private:
+  std::vector<uint8_t> xlast_decompressed_xml_;
+};
+
+}  // namespace util
+}  // namespace kernel
+}  // namespace xe
+
+#endif