From ce9008874a492de45c7257f50fafa8c10d2c1eab Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 30 Apr 2023 05:04:46 -0400
Subject: ustar: Set magic+version+chksum in written header

---
(limited to 'src')

diff --git a/src/ustar.c b/src/ustar.c
index 3c57ba5..0ecf36a 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -271,7 +271,10 @@ opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 		uid_t uid, const char *uname, gid_t gid, const char *gname,
 		uint64_t size, char type, const char *linkname)
 {
-	size_t linkname_len;
+	size_t    linkname_len;
+	uint32_t  chksum;
+	size_t    i;
+	char     *header_uc;
 
 	if (opkg_opk_dirent_name_prefix(dirent,
 				ustar->header.name,
@@ -316,6 +319,19 @@ opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 	}
 	memset(ustar->header.linkname, 0,
 			sizeof(ustar->header.linkname) - linkname_len);
+
+	strcpy(ustar->header.magic, "ustar");
+	memcpy(ustar->header.version, "00", 2);
+	chksum = 0;
+	for (i = 0; i < sizeof(ustar->header.chksum); ++i) {
+		ustar->header.chksum[i] = ' ';
+	}
+	header_uc = (char *) &ustar->header;
+	for (i = 0; i < OPKG_OPK_USTAR_RECORD_SIZE; ++i) {
+		chksum += header_uc[i];
+	}
+	sprintf(ustar->header.chksum, "%o", chksum);
+
 	if (opkg_opk_gzip_write(ustar->gzip, &ustar->header,
 				OPKG_OPK_USTAR_RECORD_SIZE, 0) != OPKG_OPK_OK) {
 		return OPKG_OPK_ERROR;
--
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