InputStream: add constructor/destructor

Eliminate input_stream_init() and input_stream_deinit().

src/archive/Bzip2ArchivePlugin.cxx

@@ -184,16 +184,15 @@ bz2_close(struct archive_file *file)
 
 Bzip2InputStream::Bzip2InputStream(Bzip2ArchiveFile &_context, const char *uri,
 				   Mutex &mutex, Cond &cond)
-	:archive(&_context), eof(false)
+	:base(bz2_inputplugin, uri, mutex, cond),
+	 archive(&_context), eof(false)
 {
-	input_stream_init(&base, &bz2_inputplugin, uri, mutex, cond);
 	refcount_inc(&archive->ref);
 }
 
 Bzip2InputStream::~Bzip2InputStream()
 {
 	bz2_close(&archive->base);
-	input_stream_deinit(&base);
 }
 
 static struct input_stream *

src/archive/Iso9660ArchivePlugin.cxx

@@ -178,10 +178,9 @@ struct Iso9660InputStream {
 	Iso9660InputStream(Iso9660ArchiveFile &_archive, const char *uri,
 			   Mutex &mutex, Cond &cond,
 			   iso9660_stat_t *_statbuf)
-		:archive(&_archive), statbuf(_statbuf),
+		:base(iso9660_input_plugin, uri, mutex, cond),
+		      archive(&_archive), statbuf(_statbuf),
 		 max_blocks(CEILING(statbuf->size, ISO_BLOCKSIZE)) {
-		input_stream_init(&base, &iso9660_input_plugin, uri,
-				  mutex, cond);
 
 		base.ready = true;
 		base.size = statbuf->size;
@@ -192,7 +191,6 @@ struct Iso9660InputStream {
 	~Iso9660InputStream() {
 		free(statbuf);
 		archive->Unref();
-		input_stream_deinit(&base);
 	}
 };
 

src/archive/ZzipArchivePlugin.cxx

@@ -142,10 +142,8 @@ struct ZzipInputStream {
 	ZzipInputStream(ZzipArchiveFile &_archive, const char *uri,
 			Mutex &mutex, Cond &cond,
 			ZZIP_FILE *_file)
-		:archive(&_archive), file(_file) {
-		input_stream_init(&base, &zzip_input_plugin, uri,
-				  mutex, cond);
-
+		:base(zzip_input_plugin, uri, mutex, cond),
+		 archive(&_archive), file(_file) {
 		base.ready = true;
 		//we are seekable (but its not recommendent to do so)
 		base.seekable = true;
@@ -160,7 +158,6 @@ struct ZzipInputStream {
 	~ZzipInputStream() {
 		zzip_file_close(file);
 		archive->Unref();
-		input_stream_deinit(&base);
 	}
 };