From 4a9d3a83d5f62afaa841fd79a5b90089e4975475 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sat, 29 Apr 2023 23:04:43 -0400
Subject: ustar: Add function to write header

---
diff --git a/src/ustar.c b/src/ustar.c
index 1a2858b..0eda87a 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -22,6 +22,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "defs.h"
+#include "dirent.h"
 #include "gzip.h"
 #include "ustar.h"
 
@@ -264,6 +265,61 @@ opkg_opk_ustar_read(struct opkg_opk_ustar *ustar, char **buffer, size_t *size)
 	return OPKG_OPK_OK;
 }
 
+int
+opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
+		struct opkg_opk_dirent *dirent, uint16_t mode,
+		uid_t uid, const char *uname, gid_t gid, const char *gname,
+		uint64_t size, char type, const char *linkname)
+{
+	size_t linkname_len;
+
+	if (opkg_opk_dirent_name_prefix(dirent,
+				ustar->header.name,
+				sizeof(ustar->header.name),
+				ustar->header.prefix,
+				sizeof(ustar->header.prefix)) != OPKG_OPK_OK) {
+		return OPKG_OPK_ERROR;
+	}
+	sprintf(ustar->header.mode, "%o", mode);
+	sprintf(ustar->header.uid,  "%o", uid);
+	sprintf(ustar->header.gid,  "%o", gid);
+	strncpy(ustar->header.uname, uname, sizeof(ustar->header.uname));
+	strncpy(ustar->header.gname, gname, sizeof(ustar->header.gname));
+	sprintf(ustar->header.size, "%o", size);
+	switch (type) {
+		case '-':  /* Regular file */
+			*ustar->header.typeflag = '0';
+			break;
+		case 'l':  /* Symbolic link */
+			*ustar->header.typeflag = '2';
+			break;
+		case 'c':  /* Character special file */
+			*ustar->header.typeflag = '3';
+			break;
+		case 'b':  /* Block special file */
+			*ustar->header.typeflag = '4';
+			break;
+		case 'd':  /* Directory */
+			*ustar->header.typeflag = '5';
+			break;
+		case 'p':  /* FIFO special file */
+			*ustar->header.typeflag = '6';
+			break;
+		default:
+			return OPKG_OPK_ERROR;  /* Unsupported */
+	}
+	linkname_len = strlen(linkname);
+	memcpy(ustar->header.linkname, linkname, linkname_len);
+	ustar->header.linkname[linkname_len] = '\0';
+	if (opkg_opk_gzip_write(ustar->gzip, &ustar->header,
+				OPKG_OPK_USTAR_RECORD_SIZE, 0) != OPKG_OPK_OK) {
+		return OPKG_OPK_ERROR;
+	}
+
+	ustar->data_size_remaining = size;
+	return OPKG_OPK_OK;
+}
+
 void
 opkg_opk_ustar_free(struct opkg_opk_ustar *ustar)
 {
diff --git a/src/ustar.h b/src/ustar.h
index 802412a..1337f1a 100644
--- a/src/ustar.h
+++ b/src/ustar.h
@@ -21,6 +21,7 @@
 #define OPKG_OPK_USTAR_H_
 
 #include <stdint.h>
+#include "dirent.h"
 #include "gzip.h"
 
 #define OPKG_OPK_USTAR_RECORD_SIZE 512
@@ -85,6 +86,12 @@ opkg_opk_ustar_list(struct opkg_opk_ustar *ustar,
 int
 opkg_opk_ustar_read(struct opkg_opk_ustar *ustar, char **buffer, size_t *size);
 
+int
+opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
+		struct opkg_opk_dirent *dirent, uint16_t mode,
+		uid_t uid, const char *uname, gid_t gid, const char *gname,
+		uint64_t size, char type, const char *linkname);
+
 /*
  * Frees an archive structure.
  * Parameters:
--
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