mirror of
https://github.com/InstanceBrick/nightcap.git
synced 2026-10-24 00:01:08 +02:00
556 lines
16 KiB
C++
556 lines
16 KiB
C++
// Copyright 2026 Mocktail Project Authors
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// Apache 2.0 License
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//
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// Android NDK compatibility symbols used by libroblox.so on Linux. Asset calls
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// can read from an extracted directory or directly from an APK.
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//
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// Symbols sourced from Android NDK r28 android/native_activity.h,
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// android/asset_manager.h, android/looper.h, android/configuration.h.
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <minizip/unzip.h>
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#if defined(MOCKTAIL_MINIZIP_HAS_STREAM_TELL)
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#include <minizip/mz_strm.h>
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#endif
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include <cerrno>
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <string>
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#include <vector>
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// Read-only asset access
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struct AAssetManager {};
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struct AAsset {
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std::string path;
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std::string apk_entry;
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std::vector<unsigned char> data;
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size_t offset = 0;
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};
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struct AAssetDir {};
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namespace {
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AAssetManager g_asset_manager;
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const char* GetEnvNonEmpty(const char* name) {
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const char* value = std::getenv(name);
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return value != nullptr && value[0] != '\0' ? value : nullptr;
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}
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bool TraceEnabled() {
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return GetEnvNonEmpty("MOCKTAIL_ANDROID_STUB_TRACE") != nullptr ||
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GetEnvNonEmpty("MOCKTAIL_WINDOW_TRACE") != nullptr ||
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GetEnvNonEmpty("MOCKTAIL_FULL_TRACE") != nullptr;
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}
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bool AssetTraceEnabled() {
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return GetEnvNonEmpty("MOCKTAIL_ASSET_TRACE") != nullptr ||
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GetEnvNonEmpty("MOCKTAIL_TRACE_ALL") != nullptr ||
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GetEnvNonEmpty("MOCKTAIL_FULL_TRACE") != nullptr;
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}
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std::string StripAssetUriPrefix(const char* filename) {
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std::string path(filename ? filename : "");
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static const char* kPrefixes[] = {
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"file:///android_asset/",
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"rbxasset://",
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};
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for (const char* prefix : kPrefixes) {
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const size_t prefix_len = std::strlen(prefix);
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if (path.compare(0, prefix_len, prefix) == 0) {
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return path.substr(prefix_len);
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}
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}
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return path;
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}
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bool HasUnsafePathSegment(const std::string& path) {
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if (path.empty() || path[0] == '/') {
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return true;
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}
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return path == "." || path == ".." ||
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path.find("/../") != std::string::npos || path.find("../") == 0 ||
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path.rfind("/..") == path.size() - 3 ||
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path.find("//") != std::string::npos;
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}
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std::string StripAndroidAssetPrefix(const std::string& path) {
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static const char* kPrefixes[] = {
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"assets/",
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"content/",
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};
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for (const char* prefix : kPrefixes) {
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const size_t prefix_len = std::strlen(prefix);
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if (path.compare(0, prefix_len, prefix) == 0) {
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return path.substr(prefix_len);
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}
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}
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return path;
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}
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bool FileExists(const std::string& path) {
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struct stat st;
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return !path.empty() && ::stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode);
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}
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std::string ResolveAssetPath(const char* filename) {
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std::string requested = StripAssetUriPrefix(filename);
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if (HasUnsafePathSegment(requested)) {
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return {};
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}
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const char* root_env = GetEnvNonEmpty("MOCKTAIL_ASSET_ROOT");
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std::string root = root_env != nullptr ? root_env : "rbx_bin/assets";
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std::string stripped = StripAndroidAssetPrefix(requested);
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const std::vector<std::string> candidates = {
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root + "/" + requested,
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root + "/" + stripped,
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root + "/ExtraContent/" + requested,
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root + "/ExtraContent/" + stripped,
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};
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for (const std::string& candidate : candidates) {
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if (FileExists(candidate)) {
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return candidate;
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}
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}
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return {};
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}
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bool LoadFile(const std::string& path, std::vector<unsigned char>* data) {
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if (data == nullptr) {
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return false;
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}
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FILE* file = std::fopen(path.c_str(), "rb");
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if (file == nullptr) {
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return false;
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}
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if (std::fseek(file, 0, SEEK_END) != 0) {
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std::fclose(file);
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return false;
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}
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long size = std::ftell(file);
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if (size < 0) {
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std::fclose(file);
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return false;
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}
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if (std::fseek(file, 0, SEEK_SET) != 0) {
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std::fclose(file);
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return false;
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}
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data->resize(static_cast<size_t>(size));
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if (size > 0) {
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size_t read = std::fread(data->data(), 1, static_cast<size_t>(size), file);
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if (read != static_cast<size_t>(size)) {
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std::fclose(file);
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return false;
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}
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}
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std::fclose(file);
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return true;
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}
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std::string ApkEntryName(const char* filename) {
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std::string requested = StripAssetUriPrefix(filename);
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constexpr const char* kAssetsPrefix = "assets/";
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if (requested.compare(0, std::strlen(kAssetsPrefix), kAssetsPrefix) == 0) {
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requested.erase(0, std::strlen(kAssetsPrefix));
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}
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return "assets/" + requested;
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}
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bool OpenStoredApkEntryDescriptor(const std::string& entry_name, int* fd,
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off_t* start, off_t* length) {
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const char* apk_path = GetEnvNonEmpty("MOCKTAIL_ASSET_APK_PATH");
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if (apk_path == nullptr || fd == nullptr || start == nullptr ||
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length == nullptr) {
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return false;
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}
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unzFile archive = unzOpen64(apk_path);
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if (archive == nullptr ||
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unzLocateFile(archive, entry_name.c_str(), 1) != UNZ_OK) {
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if (archive != nullptr) {
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unzClose(archive);
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}
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return false;
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}
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unz_file_info64 info{};
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if (unzGetCurrentFileInfo64(archive, &info, nullptr, 0, nullptr, 0, nullptr,
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0) != UNZ_OK ||
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info.compression_method != 0 || unzOpenCurrentFile(archive) != UNZ_OK) {
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unzClose(archive);
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return false;
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}
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ZPOS64_T data_offset = 0;
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#if defined(MOCKTAIL_MINIZIP_HAS_ZSTREAM_POS)
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data_offset = unzGetCurrentFileZStreamPos64(archive);
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#elif defined(MOCKTAIL_MINIZIP_HAS_STREAM_TELL)
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const int64_t stream_offset = mz_stream_tell(unzGetStream(archive));
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if (stream_offset < 0) {
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unzCloseCurrentFile(archive);
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unzClose(archive);
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return false;
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}
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data_offset = static_cast<ZPOS64_T>(stream_offset);
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#endif
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unzCloseCurrentFile(archive);
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unzClose(archive);
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if (data_offset > static_cast<ZPOS64_T>(INT64_MAX) ||
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info.uncompressed_size > static_cast<ZPOS64_T>(INT64_MAX)) {
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return false;
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}
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const int apk_fd = ::open(apk_path, O_RDONLY | O_CLOEXEC);
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if (apk_fd < 0) {
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return false;
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}
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*fd = apk_fd;
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*start = static_cast<off_t>(data_offset);
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*length = static_cast<off_t>(info.uncompressed_size);
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return true;
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}
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template <typename Fn>
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Fn ResolveDefault(const char* name) {
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return reinterpret_cast<Fn>(dlsym(RTLD_DEFAULT, name));
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}
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void* MocktailNativeWindow() {
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using Fn = void* (*)();
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Fn fn = ResolveDefault<Fn>("mocktail_native_window");
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return fn != nullptr ? fn() : nullptr;
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}
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int MocktailWindowWidth() {
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using Fn = int (*)();
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Fn fn = ResolveDefault<Fn>("mocktail_window_width");
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return fn != nullptr ? fn() : 1280;
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}
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int MocktailWindowHeight() {
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using Fn = int (*)();
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Fn fn = ResolveDefault<Fn>("mocktail_window_height");
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return fn != nullptr ? fn() : 720;
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}
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bool MocktailUsesDirectVulkan() {
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using Fn = bool (*)();
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Fn fn = ResolveDefault<Fn>("mocktail_window_uses_direct_vulkan");
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if (fn != nullptr) {
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return fn();
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}
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const char* backend = GetEnvNonEmpty("MOCKTAIL_GRAPHICS_BACKEND");
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return backend != nullptr && std::strcmp(backend, "direct-vulkan") == 0;
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}
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} // namespace
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extern "C" {
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AAsset* AAssetManager_open(AAssetManager* mgr, const char* filename,
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int) {
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if (mgr == nullptr) {
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return nullptr;
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}
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std::string path = ResolveAssetPath(filename);
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if (path.empty()) {
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return nullptr;
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}
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auto* asset = new AAsset;
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asset->path = path;
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asset->apk_entry = ApkEntryName(filename);
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if (!LoadFile(path, &asset->data)) {
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delete asset;
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return nullptr;
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}
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if (AssetTraceEnabled()) {
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std::fprintf(stderr, "[asset] open %s -> %s (%zu bytes)\n", filename,
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path.c_str(), asset->data.size());
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}
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return asset;
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}
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void AAsset_close(AAsset* asset) {
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if (asset != nullptr && AssetTraceEnabled() &&
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asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] close %s buffer=%p size=%zu\n",
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asset->path.c_str(), asset->data.data(), asset->data.size());
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}
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delete asset;
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}
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int AAsset_read(AAsset* asset, void* buf, size_t count) {
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if (asset == nullptr || buf == nullptr) {
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return -1;
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}
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const size_t remaining = asset->offset <= asset->data.size()
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? asset->data.size() - asset->offset
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: 0;
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const size_t to_read = std::min(count, remaining);
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if (to_read > 0) {
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std::memcpy(buf, asset->data.data() + asset->offset, to_read);
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asset->offset += to_read;
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}
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if (AssetTraceEnabled() && asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] read %s count=%zu -> %zu offset=%zu\n",
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asset->path.c_str(), count, to_read, asset->offset);
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}
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return static_cast<int>(to_read);
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}
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const void* AAsset_getBuffer(AAsset* asset) {
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if (asset == nullptr) {
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return nullptr;
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}
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if (AssetTraceEnabled() && asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] getBuffer %s -> %zu bytes\n",
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asset->path.c_str(), asset->data.size());
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}
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return asset->data.empty() ? static_cast<const void*>("")
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: static_cast<const void*>(asset->data.data());
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}
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off_t AAsset_getLength(AAsset* asset) {
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if (asset != nullptr && AssetTraceEnabled() &&
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asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] getLength %s -> %zu bytes\n",
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asset->path.c_str(), asset->data.size());
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}
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return asset == nullptr ? 0 : static_cast<off_t>(asset->data.size());
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}
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off_t AAsset_getLength64(AAsset* asset) { return AAsset_getLength(asset); }
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off_t AAsset_getRemainingLength(AAsset* asset) {
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if (asset == nullptr || asset->offset > asset->data.size()) {
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return 0;
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}
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if (AssetTraceEnabled() && asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] getRemainingLength %s -> %zu bytes\n",
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asset->path.c_str(), asset->data.size() - asset->offset);
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}
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return static_cast<off_t>(asset->data.size() - asset->offset);
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}
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off_t AAsset_getRemainingLength64(AAsset* asset) {
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return AAsset_getRemainingLength(asset);
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}
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off_t AAsset_seek(AAsset* asset, off_t offset, int whence) {
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if (asset == nullptr) {
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return -1;
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}
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off_t base = 0;
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if (whence == SEEK_SET) {
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base = 0;
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} else if (whence == SEEK_CUR) {
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base = static_cast<off_t>(asset->offset);
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} else if (whence == SEEK_END) {
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base = static_cast<off_t>(asset->data.size());
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} else {
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errno = EINVAL;
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return -1;
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}
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off_t next = base + offset;
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if (next < 0) {
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errno = EINVAL;
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return -1;
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}
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const auto clamped = std::min(static_cast<size_t>(next), asset->data.size());
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asset->offset = clamped;
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if (AssetTraceEnabled() && asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr, "[asset] seek %s offset=%lld whence=%d -> %zu\n",
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asset->path.c_str(), static_cast<long long>(offset), whence,
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asset->offset);
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}
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return static_cast<off_t>(asset->offset);
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}
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off_t AAsset_seek64(AAsset* asset, off_t offset, int whence) {
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return AAsset_seek(asset, offset, whence);
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}
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int AAsset_openFileDescriptor(AAsset* asset, off_t* outStart,
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off_t* outLength) {
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if (asset == nullptr || asset->path.empty()) {
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return -1;
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}
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int fd = -1;
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off_t start = 0;
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off_t descriptor_length = static_cast<off_t>(asset->data.size());
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if (!OpenStoredApkEntryDescriptor(asset->apk_entry, &fd, &start,
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&descriptor_length)) {
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fd = ::open(asset->path.c_str(), O_RDONLY | O_CLOEXEC);
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}
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if (fd < 0) {
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return -1;
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}
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if (outStart != nullptr) {
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*outStart = start;
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}
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if (outLength != nullptr) {
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*outLength = descriptor_length;
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}
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if (AssetTraceEnabled() && asset->path.find("shader") != std::string::npos) {
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std::fprintf(stderr,
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"[asset] openFileDescriptor %s -> fd=%d start=%lld "
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"length=%zu\n",
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asset->path.c_str(), fd, static_cast<long long>(start),
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static_cast<size_t>(descriptor_length));
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}
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return fd;
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}
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int AAsset_openFileDescriptor64(AAsset* asset, off_t* outStart,
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off_t* outLength) {
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return AAsset_openFileDescriptor(asset, outStart, outLength);
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}
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AAssetManager* AAssetManager_fromJava(void*, void*) {
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return &g_asset_manager;
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}
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// AConfiguration — device configuration query
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struct AConfiguration {};
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AConfiguration* AConfiguration_new() {
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return static_cast<AConfiguration*>(calloc(1, sizeof(AConfiguration)));
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}
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void AConfiguration_delete(AConfiguration* config) { free(config); }
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void AConfiguration_fromAssetManager(AConfiguration*,
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AAssetManager*) {}
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void AConfiguration_getLanguage(AConfiguration*, char* out) {
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if (out) {
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out[0] = 'e';
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out[1] = 'n';
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}
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}
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void AConfiguration_getCountry(AConfiguration*, char* out) {
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if (out) {
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out[0] = 'U';
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out[1] = 'S';
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}
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}
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int32_t AConfiguration_getScreenSize(AConfiguration*) {
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return 2; // ACONFIGURATION_SCREENSIZE_NORMAL
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}
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int32_t AConfiguration_getScreenWidthDp(AConfiguration*) {
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return 360;
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}
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int32_t AConfiguration_getScreenHeightDp(AConfiguration*) {
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return 640;
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}
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int32_t AConfiguration_getNavHidden(AConfiguration*) {
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return 1; // ACONFIGURATION_NAVHIDDEN_YES
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}
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// ALooper — event loop / file descriptor polling
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struct ALooper {};
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ALooper* ALooper_prepare(int) {
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static ALooper kLooper;
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return &kLooper;
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}
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ALooper* ALooper_forThread() {
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static ALooper kLooper;
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return &kLooper;
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}
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void ALooper_acquire(ALooper*) {}
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void ALooper_release(ALooper*) {}
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int ALooper_addFd(ALooper*, int, int,
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int, void*, void*) {
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return 1;
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}
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int ALooper_removeFd(ALooper*, int) { return 1; }
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int ALooper_pollOnce(int, int*, int*,
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void**) {
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return -2; // ALOOPER_POLL_TIMEOUT
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}
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// ANativeWindow — surface / window handle
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struct ANativeWindow {};
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void ANativeWindow_acquire(ANativeWindow*) {}
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void ANativeWindow_release(ANativeWindow*) {}
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ANativeWindow* ANativeWindow_fromSurface(void* env, void* surface) {
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void* native_window = MocktailNativeWindow();
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// The direct-Vulkan WSI adapter ignores the Android window
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// member and creates VkSurfaceKHR from SDL_Window. Preserve the Java Surface
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// token as its opaque ANativeWindow identity so a recreated Surface is not
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// collapsed back onto the same SDL_Window pointer inside Roblox.
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if (surface != nullptr && MocktailUsesDirectVulkan()) {
|
|
if (TraceEnabled()) {
|
|
std::fprintf(stderr,
|
|
"[androidstub] ANativeWindow_fromSurface env=%p surface=%p "
|
|
"-> surface_identity=%p backend_window=%p\n",
|
|
env, surface, surface, native_window);
|
|
}
|
|
return reinterpret_cast<ANativeWindow*>(surface);
|
|
}
|
|
if (native_window != nullptr) {
|
|
if (TraceEnabled()) {
|
|
std::fprintf(stderr,
|
|
"[androidstub] ANativeWindow_fromSurface env=%p surface=%p "
|
|
"-> native_window=%p\n",
|
|
env, surface, native_window);
|
|
}
|
|
return reinterpret_cast<ANativeWindow*>(native_window);
|
|
}
|
|
static ANativeWindow fallback_window;
|
|
if (TraceEnabled()) {
|
|
std::fprintf(stderr,
|
|
"[androidstub] ANativeWindow_fromSurface env=%p surface=%p "
|
|
"-> fallback_window=%p\n",
|
|
env, surface, static_cast<void*>(&fallback_window));
|
|
}
|
|
return &fallback_window;
|
|
}
|
|
|
|
int32_t ANativeWindow_getWidth(ANativeWindow* window) {
|
|
int width = MocktailWindowWidth();
|
|
if (TraceEnabled()) {
|
|
std::fprintf(stderr,
|
|
"[androidstub] ANativeWindow_getWidth window=%p -> %d\n",
|
|
static_cast<void*>(window), width);
|
|
}
|
|
return width;
|
|
}
|
|
|
|
int32_t ANativeWindow_getHeight(ANativeWindow* window) {
|
|
int height = MocktailWindowHeight();
|
|
if (TraceEnabled()) {
|
|
std::fprintf(stderr,
|
|
"[androidstub] ANativeWindow_getHeight window=%p -> %d\n",
|
|
static_cast<void*>(window), height);
|
|
}
|
|
return height;
|
|
}
|
|
|
|
} // extern "C"
|