From f36acc8cfe90ff98ad39e9d84b0270890f442273 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Fri, 14 Apr 2023 15:43:48 -0400
Subject: [WIP] main: Print control file and list data files

---
diff --git a/src/main.c b/src/main.c
index 25659b6..700cc36 100644
--- a/src/main.c
+++ b/src/main.c
@@ -47,36 +47,110 @@ _opkg_opk_main_file_read(void *user_data, char **buffer, size_t *size)
 	}
 }
 
-int
-main(int argc, char *argv[])
+static int
+_opkg_opk_main_extract(const char *file_name, const char *outer_member,
+		int (*inner_action)(struct opkg_opk_ustar *))
 {
 	struct _opkg_opk_main_file    file;
-	struct opkg_opk_gzip         *gzip;
-	struct opkg_opk_ustar        *ustar;
-	struct opkg_opk_ustar_member  member;
-	int                           ret;
+	struct opkg_opk_gzip         *outer_gzip;
+	struct opkg_opk_ustar        *outer_ustar;
+	struct opkg_opk_gzip         *inner_gzip;
+	struct opkg_opk_ustar        *inner_ustar;
 
-	file.file = fopen(argv[1], "rb");
+	file.file = fopen(file_name, "rb");
 	if (file.file == NULL) {
-		return EXIT_FAILURE;
+		return OPKG_OPK_ERROR;
 	}
-	gzip = opkg_opk_gzip_init(&_opkg_opk_main_file_read, &file);
-	if (gzip == NULL) {
+
+	outer_gzip = opkg_opk_gzip_init(&_opkg_opk_main_file_read, &file);
+	if (outer_gzip == NULL) {
 		fclose(file.file);
-		return EXIT_FAILURE;
+		return OPKG_OPK_ERROR;
 	}
-	ustar = opkg_opk_ustar_init(gzip);
-	if (ustar == NULL) {
-		opkg_opk_gzip_free(gzip);
+
+	outer_ustar = opkg_opk_ustar_init(outer_gzip);
+	if (outer_ustar == NULL) {
+		opkg_opk_gzip_free(outer_gzip);
 		fclose(file.file);
-		return EXIT_FAILURE;
+		return OPKG_OPK_ERROR;
+	}
+
+	opkg_opk_ustar_seek(outer_ustar, outer_member);
+	inner_gzip = opkg_opk_gzip_init(&opkg_opk_ustar_read, outer_ustar);
+	if (inner_gzip == NULL) {
+		opkg_opk_ustar_free(outer_ustar);
+		opkg_opk_gzip_free(outer_gzip);
+		fclose(file.file);
+		return OPKG_OPK_ERROR;
+	}
+
+	inner_ustar = opkg_opk_ustar_init(inner_gzip);
+	if (inner_ustar == NULL) {
+		opkg_opk_gzip_free(inner_gzip);
+		opkg_opk_ustar_free(outer_ustar);
+		opkg_opk_gzip_free(outer_gzip);
+		fclose(file.file);
+		return OPKG_OPK_ERROR;
+	}
+
+	inner_action(inner_ustar);
+
+	opkg_opk_ustar_free(inner_ustar);
+	opkg_opk_gzip_free(inner_gzip);
+	opkg_opk_ustar_free(outer_ustar);
+	opkg_opk_gzip_free(outer_gzip);
+	fclose(file.file);
+
+	return OPKG_OPK_OK;
+}
+
+static int
+_opkg_opk_main_read_control(struct opkg_opk_ustar *ustar)
+{
+	char    buffer[OPKG_OPK_USTAR_RECORD_SIZE];
+	size_t  size;
+	int     ret;
+
+	opkg_opk_ustar_seek(ustar, "control");
+	while ((ret = opkg_opk_ustar_read(ustar, &buffer, &size)) ==
+			OPKG_OPK_OK) {
+		fwrite(buffer, 1, size, stdout);
+	}
+	if (ret == OPKG_OPK_ERROR) {
+		return OPKG_OPK_ERROR;
 	}
+
+	return OPKG_OPK_OK;
+}
+
+static int
+_opkg_opk_main_list_members(struct opkg_opk_ustar *ustar)
+{
+	struct opkg_opk_ustar_member  member;
+	int                           ret;
+
 	while ((ret = opkg_opk_ustar_list(ustar, &member)) == OPKG_OPK_OK) {
 		puts(member.name);
 	}
-	opkg_opk_gzip_free(gzip);
-	opkg_opk_ustar_free(ustar);
-	fclose(file.file);
+	if (ret == OPKG_OPK_ERROR) {
+		return OPKG_OPK_ERROR;
+	}
+
+	return OPKG_OPK_OK;
+}
+
+int
+main(int argc, char *argv[])
+{
+//	if (_opkg_opk_main_extract(argv[1], "control.tar.gz",
+//			&_opkg_opk_main_read_control) != OPKG_OPK_OK) {
+//		return EXIT_FAILURE;
+//	}
+//	puts("");
+	if (_opkg_opk_main_extract(argv[1], "data.tar.gz",
+			&_opkg_opk_main_list_members) != OPKG_OPK_OK) {
+		return EXIT_FAILURE;
+	}
 
 	return EXIT_SUCCESS;
 }
--
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