From dc25a788d874d9ee95738b9fa56d2a06f6a31141 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 30 Apr 2023 03:44:20 -0400
Subject: opk/write: Build mode (WIP)

---
(limited to 'src/opk/write.c')

diff --git a/src/opk/write.c b/src/opk/write.c
new file mode 100644
index 0000000..12a36c6
--- /dev/null
+++ b/src/opk/write.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2023  Patrick McDermott
+ *
+ * This file is part of opkg-opkg.
+ *
+ * opkg-opkg is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * opkg-opkg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with opkg-opkg.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include "../defs.h"
+#include "../dirent.h"
+#include "../gzip.h"
+#include "../i18n.h"
+#include "../opk.h"
+#include "../ustar.h"
+#include "opk.h"
+
+static int
+_opkg_opk_opk_write_file(void *user_data, size_t size)
+{
+	struct opkg_opk_opk *opk = user_data;
+
+	if (fwrite(opk->file_buffer, 1, sizeof(opk->file_buffer), opk->file) ==
+			size) {
+		return OPKG_OPK_OK;
+	} else {
+		return OPKG_OPK_ERROR;
+	}
+}
+
+int
+opkg_opk_opk_write(struct opkg_opk_opk *opk, const char *file_name)
+{
+	int                     ret;
+	struct opkg_opk_dirent  dirent;
+	char                   *buffer;
+	size_t                  size;
+
+	ret = OPKG_OPK_OK;
+
+	/* Open outer archive. */
+	opk->file = fopen(file_name, "wb");
+	if (opk->file == NULL) {
+		fprintf(stderr, _("Error: Failed to open file \"%s\"\n"),
+				file_name);
+		ret = OPKG_OPK_ERROR;
+		goto out0;
+	}
+
+	/* Initialize outer gzip decompressor. */
+	opk->outer_gzip = opkg_opk_gzip_init_write(&_opkg_opk_opk_write_file,
+			opk);
+	if (opk->outer_gzip == NULL) {
+		fputs(_("Error: Failed to initialize\n"), stderr);
+		ret = OPKG_OPK_ERROR;
+		goto out1;
+	}
+	opkg_opk_gzip_set_write_buffer(opk->outer_gzip, opk->file_buffer,
+			sizeof(opk->file_buffer));
+
+	/* Initialize outer ustar unarchiver. */
+	opk->outer_ustar = opkg_opk_ustar_init(opk->outer_gzip);
+	if (opk->outer_ustar == NULL) {
+		fputs(_("Error: Failed to initialize\n"), stderr);
+		ret = OPKG_OPK_ERROR;
+		goto out2;
+	}
+
+	/* Write version file. */
+	dirent.name   = "debian-binary";
+	dirent.parent = NULL;
+	if (opkg_opk_ustar_write_header(opk->outer_ustar, &dirent, 0644,
+				0, getpwuid(0)->pw_name,
+				0, getgrgid(0)->gr_name,
+				4, '-', NULL) != OPKG_OPK_OK) {
+		fputs(_("Error: Failed to write header\n"), stderr);
+		ret = OPKG_OPK_ERROR;
+		goto out3;
+	}
+	opkg_opk_ustar_get_buffer(opk->outer_ustar, &buffer, &size);
+	memcpy(buffer, "2.0\n", 4);
+	if (opkg_opk_ustar_write_data(opk->outer_ustar, 4) != OPKG_OPK_OK) {
+		fputs(_("Error: Failed to write data\n"), stderr);
+		ret = OPKG_OPK_ERROR;
+		goto out3;
+	}
+
+	/* TODO: control.tar.gz and data.tar.gz */
+
+	/* Write trailer. */
+	if (opkg_opk_ustar_write_trailer(opk->outer_ustar) != OPKG_OPK_OK) {
+		fputs(_("Error: Failed to write trailer\n"), stderr);
+		ret = OPKG_OPK_ERROR;
+		goto out3;
+	}
+
+ out3:
+	opkg_opk_ustar_free(opk->outer_ustar);
+ out2:
+	opkg_opk_gzip_free(opk->outer_gzip);
+ out1:
+	fclose(opk->file);
+ out0:
+	return ret;
+}
--
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