git-archive: wire up ZIP format.

Again, this is based on Rene Scharfe's earlier patch, but uses
the archiver support introduced by the previous patch.

Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com>
Acked-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

archive.h

@@ -41,5 +41,6 @@ extern void parse_pathspec_arg(const char **pathspec,
  * Archive-format specific backends.
  */
 extern int write_tar_archive(struct archiver_args *);
+extern int write_zip_archive(struct archiver_args *);
 
 #endif	/* ARCHIVE_H */

builtin-archive.c

@@ -16,6 +16,7 @@ static const char archive_usage[] = \
 
 struct archiver archivers[] = {
 	{ .name = "tar", .write_archive = write_tar_archive },
+	{ .name = "zip", .write_archive = write_zip_archive },
 };
 
 static int run_remote_archiver(struct archiver *ar, int argc,

builtin-zip-tree.c

@@ -8,6 +8,7 @@
 #include "tree.h"
 #include "quote.h"
 #include "builtin.h"
+#include "archive.h"
 
 static const char zip_tree_usage[] =
 "git-zip-tree [-0|...|-9] <tree-ish> [ <base> ]";
@@ -351,3 +352,30 @@ int cmd_zip_tree(int argc, const char **argv, const char *prefix)
 
 	return 0;
 }
+
+int write_zip_archive(struct archiver_args *args)
+{
+	int plen = strlen(args->base);
+
+	dos_time(&args->time, &zip_date, &zip_time);
+
+	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
+	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
+
+	if (args->base && plen > 0 && args->base[plen - 1] == '/') {
+		char *base = strdup(args->base);
+		int baselen = strlen(base);
+
+		while (baselen > 0 && base[baselen - 1] == '/')
+			base[--baselen] = '\0';
+		write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
+		free(base);
+	}
+	read_tree_recursive(args->tree, args->base, plen, 0,
+			    args->pathspec, write_zip_entry);
+	write_zip_trailer(args->commit_sha1);
+
+	free(zip_dir);
+
+	return 0;
+}