From 6c5ea040feeab83ad27f58b5c5c5edb699fa545e Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 13 Apr 2023 09:49:10 -0400
Subject: design.txt: Rework

---
(limited to 'design.txt')

diff --git a/design.txt b/design.txt
index 844e9cb..9fc1879 100644
--- a/design.txt
+++ b/design.txt
@@ -1,31 +1,56 @@
-file_read(buffer, size, user_data)
+file_read(user_data, buffer, *size)
 	file = user_data
-	return fread(buffer, 1, size, file)
+	*size = fread(buffer, 1, *size, file)
 
 extract(file_name, outer_member, inner_action)
-	file = fopen(file_name, "rb")
+	FILE *file = fopen(file_name, "rb")
 	outer_gzip  = gzip_init(&file_read, file)
 	outer_ustar = ustar_init(outer_gzip)
 	ustar_seek(outer_ustar, outer_member)
-	inner_gzip  = gzip_init(ustar_next_data_record, outer_ustar)
+	inner_gzip  = gzip_init(&ustar_read, outer_ustar)
 	inner_ustar = ustar_init(inner_gzip)
 	inner_action(inner_ustar)
 
-print_data(data, size)
-	fwrite(data, 1, size, stdout)
-
 read_control(inner_ustar)
+	unsigned char buffer[512]
+	size
 	ustar_seek(inner_ustar, "control")
-	ustar_read(inner_ustar, &print_data)
-
-print_member(member)
-	printf("%s", member->name)
+	while ((ret = ustar_read(inner_ustar, buffer, &size)) == OK)
+		fwrite(buffer, 1 size, stdout)
+	if ret == ERROR
+		return
 
 list_members(inner_ustar)
-	ustar_list(inner_ustar, &print_member)
+	ustar_member member
+	while ((ret = ustar_list(inner_ustar, &member)) == OK)
+		printf("%s", member.name)
+	if ret == ERROR
+		return
 
 main()
 	if -I
 		extract(argv[1], "control.tar.gz", &read_control)
 	else if -c
 		extract(argv[1], "data.tar.gz", &list_members)
+
+---
+
+struct gzip *
+gzip_init(int (*read)(void *, char *, size_t *), void *user_data)
+
+int
+gzip_read(struct gzip *gzip, void *record)
+
+---
+
+struct ustar *
+ustar_init(struct gzip *gzip)
+
+int
+ustar_list(struct ustar *ustar, ustar_member *member)
+
+int
+ustar_seek(ustruct star *ustar, const char *member)
+
+int
+ustar_read(struct ustar *ustar, char *buffer, size_t *size)
--
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