archive: centralize archive entry writing

Add the exported function write_archive_entries() to archive.c, which uses
the new ability of read_tree_recursive() to pass a context pointer to its
callback in order to centralize previously duplicated code.

The new callback function write_archive_entry() does the work that every
archiver backend needs to do: loading file contents, entering subdirectories,
handling file attributes, constructing the full path of the entry.  All that
done, it calls the backend specific write_archive_entry_fn_t function.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/archive.h b/archive.h
index 34151f4..4e44549 100644
--- a/archive.h
+++ b/archive.h
@@ -20,6 +20,8 @@ typedef int (*write_archive_fn_t)(struct archiver_args *);
 
 typedef void *(*parse_extra_args_fn_t)(int argc, const char **argv);
 
+typedef int (*write_archive_entry_fn_t)(struct archiver_args *args, const unsigned char *sha1, const char *path, size_t pathlen, unsigned int mode, void *buffer, unsigned long size);
+
 struct archiver {
 	const char *name;
 	write_archive_fn_t write_archive;
@@ -44,4 +46,6 @@ extern void *parse_extra_zip_args(int argc, const char **argv);
 extern void *sha1_file_to_archive(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size, const struct commit *commit);
 extern int is_archive_path_ignored(const char *path);
 
+extern int write_archive_entries(struct archiver_args *args, write_archive_entry_fn_t write_entry);
+
 #endif	/* ARCHIVE_H */