Remote ISO: Add working support for streaming CHD files over the network

Core/FileSystems/BlockDevices.cpp

@@ -525,13 +525,58 @@ struct CHDImpl {
 	const chd_header *header = nullptr;
 };
 
+struct ExtendedCoreFile {
+	core_file core;  // Must be the first struct member, for some tricky pointer casts.
+	uint64_t seekPos;
+};
+
 CHDFileBlockDevice::CHDFileBlockDevice(FileLoader *fileLoader)
 	: BlockDevice(fileLoader), impl_(new CHDImpl())
 {
 	Path paths[8];
 	paths[0] = fileLoader->GetPath();
 	int depth = 0;
 
+	core_file_ = new ExtendedCoreFile();
+	core_file_->core.argp = fileLoader;
+	core_file_->core.fsize = [](core_file *file) -> uint64_t {
+		FileLoader *loader = (FileLoader *)file->argp;
+		return loader->FileSize();
+	};
+	core_file_->core.fseek = [](core_file *file, int64_t offset, int seekType) -> int {
+		ExtendedCoreFile *coreFile = (ExtendedCoreFile *)file;
+		switch (seekType) {
+		case SEEK_SET:
+			coreFile->seekPos = offset;
+			break;
+		case SEEK_CUR:
+			coreFile->seekPos += offset;
+			break;
+		case SEEK_END:
+		{
+			FileLoader *loader = (FileLoader *)file->argp;
+			coreFile->seekPos = loader->FileSize() + offset;
+			break;
+		}
+		default:
+			break;
+		}
+		return 0;
+	};
+	core_file_->core.fread = [](void *out_data, size_t size, size_t count, core_file *file) {
+		ExtendedCoreFile *coreFile = (ExtendedCoreFile *)file;
+		FileLoader *loader = (FileLoader *)file->argp;
+		uint64_t totalSize = size * count;
+		loader->ReadAt(coreFile->seekPos, totalSize, out_data);
+		coreFile->seekPos += totalSize;
+		return size * count;
+	};
+	core_file_->core.fclose = [](core_file *file) {
+		ExtendedCoreFile *coreFile = (ExtendedCoreFile *)file;
+		delete coreFile;
+		return 0;
+	};
+
 	/*
 	// TODO: Support parent/child CHD files.
 
@@ -582,36 +627,15 @@ CHDFileBlockDevice::CHDFileBlockDevice(FileLoader *fileLoader)
 	}
 	*/
 
-	chd_file *parent = NULL;
-	chd_file *child = NULL;
-
-	FILE *file = File::OpenCFile(paths[depth], "rb");
-	if (!file) {
-		ERROR_LOG(LOADER, "Error opening CHD file '%s'", paths[depth].c_str());
-		NotifyReadError();
-		return;
-	}
-	chd_error err = chd_open_file(file, CHD_OPEN_READ, NULL, &child);
+	chd_file *file = nullptr;
+	chd_error err = chd_open_core_file(&core_file_->core, CHD_OPEN_READ, NULL, &file);
 	if (err != CHDERR_NONE) {
 		ERROR_LOG(LOADER, "Error loading CHD '%s': %s", paths[depth].c_str(), chd_error_string(err));
 		NotifyReadError();
 		return;
 	}
 
-	// We won't enter this loop until we enable the parent/child stuff above.
-	for (int d = depth - 1; d >= 0; d--) {
-		parent = child;
-		child = NULL;
-		// TODO: Use chd_open_file
-		err = chd_open(paths[d].c_str(), CHD_OPEN_READ, parent, &child);
-		if (err != CHDERR_NONE) {
-			ERROR_LOG(LOADER, "Error loading CHD '%s': %s", paths[d].c_str(), chd_error_string(err));
-			NotifyReadError();
-			return;
-		}
-	}
-	impl_->chd = child;
-
+	impl_->chd = file;
 	impl_->header = chd_get_header(impl_->chd);
 	readBuffer = new u8[impl_->header->hunkbytes];
 	currentHunk = -1;

Core/FileSystems/BlockDevices.h

@@ -136,6 +136,8 @@ class NPDRMDemoBlockDevice : public BlockDevice {
 
 struct CHDImpl;
 
+struct ExtendedCoreFile;
+
 class CHDFileBlockDevice : public BlockDevice {
 public:
 	CHDFileBlockDevice(FileLoader *fileLoader);
@@ -146,6 +148,7 @@ class CHDFileBlockDevice : public BlockDevice {
 	bool IsDisc() const override { return true; }
 
 private:
+	struct ExtendedCoreFile *core_file_ = nullptr;
 	std::unique_ptr<CHDImpl> impl_;
 	u8 *readBuffer = nullptr;
 	u32 currentHunk = 0;

Core/WebServer.cpp

@@ -125,9 +125,7 @@ static bool RegisterServer(int port) {
 
 bool RemoteISOFileSupported(const std::string &filename) {
 	// Disc-like files.
-	// NOTE: chd is temporarily disabled until we can make it use the FileLoader instead of
-	// trying to re-open the file, since otherwise won't work over HTTP.
-	if (endsWithNoCase(filename, ".cso") || endsWithNoCase(filename, ".iso")) {
+	if (endsWithNoCase(filename, ".cso") || endsWithNoCase(filename, ".iso") || endsWithNoCase(filename, ".chd")) {
 		return true;
 	}
 	// May work - but won't have supporting files.

UI/RemoteISOScreen.cpp

@@ -252,7 +252,7 @@ static bool LoadGameList(const Path &url, std::vector<Path> &games) {
 	std::vector<File::FileInfo> files;
 	browser.SetUserAgent(StringFromFormat("PPSSPP/%s", PPSSPP_GIT_VERSION));
 	browser.SetRootAlias("ms:", GetSysDirectory(DIRECTORY_MEMSTICK_ROOT).ToVisualString());
-	browser.GetListing(files, "iso:cso:pbp:elf:prx:ppdmp:", &scanCancelled);
+	browser.GetListing(files, "iso:cso:chd:pbp:elf:prx:ppdmp:", &scanCancelled);
 	if (scanCancelled) {
 		return false;
 	}