archive/Plugin: migrate open() from class Error to C++ exceptions

src/archive/ArchiveFile.hxx

@@ -22,7 +22,6 @@
 
 class Mutex;
 class Cond;
-class Error;
 struct ArchivePlugin;
 class ArchiveVisitor;
 class InputStream;

src/archive/ArchivePlugin.cxx

@@ -20,20 +20,15 @@
 #include "config.h"
 #include "ArchivePlugin.hxx"
 #include "fs/Path.hxx"
-#include "util/Error.hxx"
 
 #include <assert.h>
 
 ArchiveFile *
-archive_file_open(const ArchivePlugin *plugin, Path path,
-		  Error &error)
+archive_file_open(const ArchivePlugin *plugin, Path path)
 {
 	assert(plugin != nullptr);
 	assert(plugin->open != nullptr);
 	assert(!path.IsNull());
 
-	ArchiveFile *file = plugin->open(path, error);
-	assert((file == nullptr) == error.IsDefined());
-
-	return file;
+	return plugin->open(path);
 }

src/archive/ArchivePlugin.hxx

@@ -22,7 +22,6 @@
 
 class ArchiveFile;
 class Path;
-class Error;
 
 struct ArchivePlugin {
 	const char *name;
@@ -43,9 +42,10 @@ struct ArchivePlugin {
 	/**
 	 * tryes to open archive file and associates handle with archive
 	 * returns pointer to handle used is all operations with this archive
-	 * or nullptr when opening fails
+	 *
+	 * Throws std::runtime_error on error.
 	 */
-	ArchiveFile *(*open)(Path path_fs, Error &error);
+	ArchiveFile *(*open)(Path path_fs);
 
 	/**
 	 * suffixes handled by this plugin.
@@ -55,7 +55,6 @@ struct ArchivePlugin {
 };
 
 ArchiveFile *
-archive_file_open(const ArchivePlugin *plugin, Path path,
-		  Error &error);
+archive_file_open(const ArchivePlugin *plugin, Path path);
 
 #endif

src/archive/plugins/Bzip2ArchivePlugin.cxx

@@ -127,7 +127,7 @@ Bzip2InputStream::Open()
 /* archive open && listing routine */
 
 static ArchiveFile *
-bz2_open(Path pathname, gcc_unused Error &error)
+bz2_open(Path pathname)
 {
 	static Mutex mutex;
 	static Cond cond;

src/archive/plugins/Iso9660ArchivePlugin.cxx

@@ -123,16 +123,13 @@ Iso9660ArchiveFile::Visit(char *path, size_t length, size_t capacity,
 }
 
 static ArchiveFile *
-iso9660_archive_open(Path pathname, Error &error)
+iso9660_archive_open(Path pathname)
 {
 	/* open archive */
 	auto iso = iso9660_open(pathname.c_str());
-	if (iso == nullptr) {
-		error.Format(iso9660_domain,
-			     "Failed to open ISO9660 file %s",
+	if (iso == nullptr)
+		throw FormatRuntimeError("Failed to open ISO9660 file %s",
 					 pathname.c_str());
-		return nullptr;
-	}
 
 	return new Iso9660ArchiveFile(iso);
 }

src/archive/plugins/ZzipArchivePlugin.cxx

@@ -68,14 +68,12 @@ static constexpr Domain zzip_domain("zzip");
 /* archive open && listing routine */
 
 static ArchiveFile *
-zzip_archive_open(Path pathname, Error &error)
+zzip_archive_open(Path pathname)
 {
 	ZZIP_DIR *dir = zzip_dir_open(pathname.c_str(), nullptr);
-	if (dir == nullptr) {
-		error.Format(zzip_domain, "Failed to open ZIP file %s",
+	if (dir == nullptr)
+		throw FormatRuntimeError("Failed to open ZIP file %s",
 					 pathname.c_str());
-		return nullptr;
-	}
 
 	return new ZzipArchiveFile(dir);
 }

src/db/update/Archive.cxx

@@ -30,11 +30,11 @@
 #include "archive/ArchivePlugin.hxx"
 #include "archive/ArchiveFile.hxx"
 #include "archive/ArchiveVisitor.hxx"
-#include "util/Error.hxx"
 #include "util/StringCompare.hxx"
 #include "Log.hxx"
 
 #include <string>
+#include <stdexcept>
 
 #include <string.h>
 
@@ -150,10 +150,11 @@ UpdateWalk::UpdateArchiveFile(Directory &parent, const char *name,
 		return;
 
 	/* open archive */
-	Error error;
-	ArchiveFile *file = archive_file_open(&plugin, path_fs, error);
-	if (file == nullptr) {
-		LogError(error);
+	ArchiveFile *file;
+	try {
+		file = archive_file_open(&plugin, path_fs);
+	} catch (const std::runtime_error &e) {
+		LogError(e);
 		if (directory != nullptr)
 			editor.LockDeleteDirectory(directory);
 		return;

src/input/plugins/ArchiveInputPlugin.cxx

@@ -29,7 +29,6 @@
 #include "fs/Path.hxx"
 #include "Log.hxx"
 #include "util/ScopeExit.hxx"
-#include "util/Error.hxx"
 
 #include <stdexcept>
 
@@ -61,10 +60,7 @@ OpenArchiveInputStream(Path path, Mutex &mutex, Cond &cond)
 		return nullptr;
 	}
 
-	Error error;
-	auto file = archive_file_open(arplug, Path::FromFS(archive), error);
-	if (file == nullptr)
-		throw std::runtime_error(error.GetMessage());
+	auto file = archive_file_open(arplug, Path::FromFS(archive));
 
 	AtScopeExit(file) {
 		file->Close();

test/visit_archive.cxx

@@ -27,7 +27,6 @@
 #include "archive/ArchiveFile.hxx"
 #include "archive/ArchiveVisitor.hxx"
 #include "fs/Path.hxx"
-#include "util/Error.hxx"
 #include "Log.hxx"
 
 #include <stdexcept>
@@ -46,8 +45,6 @@ class MyArchiveVisitor final : public ArchiveVisitor {
 int
 main(int argc, char **argv)
 try {
-	Error error;
-
 	if (argc != 3) {
 		fprintf(stderr, "Usage: visit_archive PLUGIN PATH\n");
 		return EXIT_FAILURE;
@@ -76,15 +73,11 @@ try {
 
 	int result = EXIT_SUCCESS;
 
-	ArchiveFile *file = archive_file_open(plugin, path, error);
-	if (file != nullptr) {
+	ArchiveFile *file = archive_file_open(plugin, path);
+
 	MyArchiveVisitor visitor;
 	file->Visit(visitor);
 	file->Close();
-	} else {
-		fprintf(stderr, "%s", error.GetMessage());
-		result = EXIT_FAILURE;
-	}
 
 	/* deinitialize everything */