1 files changed, 87 insertions, 0 deletions
diff --git a/old/initrd.c b/old/initrd.c
new file mode 100644
index 0000000..8b0c80b
--- /dev/null
+++ b/old/initrd.c
@@ -0,0 +1,87 @@
+/**
+ * @file initrd.c
+ * Initrd image support
+ *
+ * Copyright (C) 2018 Clyne Sullivan
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * The format of the initrd file is custom; made with the 'rba' utility.
+ */
+
+#include <initrd.h>
+#include <heap.h>
+#include <string.h>
+
+extern uint8_t _binary_initrd_img_start[];
+extern uint8_t _binary_initrd_img_size[];
+
+static const uint8_t *initrd_start = (uint8_t *)_binary_initrd_img_start;
+static const uint32_t initrd_size = (uint32_t)_binary_initrd_img_size;
+
+uint8_t initrd_validate(void)
+{
+	return 1; // TODO maybe add header/signature to archiver?
+}
+
+char *initrd_getfile(uint32_t offset)
+{
+	char *ptr = initrd_start;
+	for (uint32_t i = 0; i < offset; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		uint32_t datalen = *((uint32_t *)(ptr + 4 + len));
+		ptr += len + datalen + 8;
+		if (ptr >= (char *)(initrd_start + initrd_size))
+			return 0;
+	}
+
+	return ptr;
+}
+
+char *initrd_getname(uint32_t offset)
+{
+	char *file = initrd_getfile(offset);
+	if (file == 0)
+		return 0;
+	uint32_t len = *((uint32_t *)file);
+	char *buf = malloc(len + 1);
+	strncpy(buf, file + 4, len);
+	buf[len] = '\0';
+	return buf;
+}
+
+char *initrd_readfile(const char *name)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(name, ptr + 4, len))
+			return ptr + len + 8;
+	}
+	return 0;
+}
+
+uint32_t initrd_filesize(const char *name)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(name, ptr + 4, len))
+			return *((uint32_t *)(ptr + len + 4));
+	}
+	return 0;
+}
+