archive: use reference counting for archive+input

Make the input_stream implementation hold a reference on the
archive_file object.  Allow the caller to "close" the archive_file
object immediately, no matter if the open_stream() method has
succeeded or not.

src/archive/bz2_archive_plugin.c

@@ -25,6 +25,7 @@
 #include "archive/bz2_archive_plugin.h"
 #include "archive_api.h"
 #include "input_plugin.h"
+#include "refcount.h"
 
 #include <stdint.h>
 #include <stddef.h>
@@ -40,6 +41,8 @@
 struct bz2_archive_file {
 	struct archive_file base;
 
+	struct refcount ref;
+
 	char *name;
 	bool reset;
 	struct input_stream istream;
@@ -105,6 +108,7 @@ bz2_open(const char *pathname, GError **error_r)
 
 	context = g_malloc(sizeof(*context));
 	archive_file_init(&context->base, &bz2_archive_plugin);
+	refcount_init(&context->ref);
 
 	//open archive
 	if (!input_stream_open(&context->istream, pathname, error_r)) {
@@ -149,6 +153,9 @@ bz2_close(struct archive_file *file)
 {
 	struct bz2_archive_file *context = (struct bz2_archive_file *) file;
 
+	if (!refcount_dec(&context->ref))
+		return;
+
 	g_free(context->name);
 
 	input_stream_close(&context->istream);
@@ -180,6 +187,8 @@ bz2_open_stream(struct archive_file *file, struct input_stream *is,
 
 	bis->eof = false;
 
+	refcount_inc(&context->ref);
+
 	return true;
 }
 

src/archive/iso9660_archive_plugin.c

@@ -25,6 +25,7 @@
 #include "archive/iso9660_archive_plugin.h"
 #include "archive_api.h"
 #include "input_plugin.h"
+#include "refcount.h"
 
 #include <cdio/cdio.h>
 #include <cdio/iso9660.h>
@@ -37,6 +38,8 @@
 struct iso9660_archive_file {
 	struct archive_file base;
 
+	struct refcount ref;
+
 	iso9660_t *iso;
 	GSList	*list;
 	GSList	*iter;
@@ -93,6 +96,7 @@ iso9660_archive_open(const char *pathname, GError **error_r)
 		g_new(struct iso9660_archive_file, 1);
 
 	archive_file_init(&context->base, &iso9660_archive_plugin);
+	refcount_init(&context->ref);
 
 	context->list = NULL;
 
@@ -139,8 +143,11 @@ iso9660_archive_close(struct archive_file *file)
 {
 	struct iso9660_archive_file *context =
 		(struct iso9660_archive_file *)file;
-
 	GSList *tmp;
+
+	if (!refcount_dec(&context->ref))
+		return;
+
 	if (context->list) {
 		//free list
 		for (tmp = context->list; tmp != NULL; tmp = g_slist_next(tmp))
@@ -192,6 +199,9 @@ iso9660_archive_open_stream(struct archive_file *file, struct input_stream *is,
 	is->size = iis->statbuf->size;
 
 	iis->max_blocks = CEILING(iis->statbuf->size, ISO_BLOCKSIZE);
+
+	refcount_inc(&context->ref);
+
 	return true;
 }
 

src/archive/zzip_archive_plugin.c

@@ -26,6 +26,7 @@
 #include "archive_api.h"
 #include "archive_api.h"
 #include "input_plugin.h"
+#include "refcount.h"
 
 #include <zzip/zzip.h>
 #include <glib.h>
@@ -34,6 +35,8 @@
 struct zzip_archive {
 	struct archive_file base;
 
+	struct refcount ref;
+
 	ZZIP_DIR *dir;
 	GSList	*list;
 	GSList	*iter;
@@ -56,6 +59,7 @@ zzip_archive_open(const char *pathname, GError **error_r)
 	ZZIP_DIRENT dirent;
 
 	archive_file_init(&context->base, &zzip_archive_plugin);
+	refcount_init(&context->ref);
 
 	// open archive
 	context->list = NULL;
@@ -102,6 +106,10 @@ static void
 zzip_archive_close(struct archive_file *file)
 {
 	struct zzip_archive *context = (struct zzip_archive *) file;
+
+	if (!refcount_dec(&context->ref))
+		return;
+
 	if (context->list) {
 		//free list
 		for (GSList *tmp = context->list; tmp != NULL; tmp = g_slist_next(tmp))
@@ -151,6 +159,9 @@ zzip_archive_open_stream(struct archive_file *file, struct input_stream *is,
 
 	zzip_file_stat(zis->file, &z_stat);
 	is->size = z_stat.st_size;
+
+	refcount_inc(&context->ref);
+
 	return true;
 }
 

src/archive_plugin.h

@@ -67,9 +67,6 @@ struct archive_plugin {
 	/**
 	 * Opens an input_stream of a file within the archive.
 	 *
-	 * If this function succeeds, then the #input_stream "owns"
-	 * the archive file and will automatically close it.
-	 *
 	 * @param path the path within the archive
 	 * @param error_r location to store the error occuring, or
 	 * NULL to ignore errors

src/input/archive_input_plugin.c

@@ -67,11 +67,8 @@ input_archive_open(struct input_stream *is, const char *pathname,
 
 	//setup fileops
 	opened = archive_file_open_stream(file, is, filename, error_r);
-	g_free(pname);
-
-	if (!opened) {
 	archive_file_close(file);
-	}
+	g_free(pname);
 
 	return opened;
 }