Added initrd. Status: VFS support, totally useless shell.

1 files changed, 67 insertions, 0 deletions

diff --git a/src/kernel/vfs/initrd.cpp b/src/kernel/vfs/initrd.cpp
new file mode 100644
index 0000000..50aa95c
--- /dev/null
+++ b/src/kernel/vfs/initrd.cpp
@@ -0,0 +1,67 @@
+#include "initrd.h"
+#include "vfile.h"
+#include <ui/vt.h>
+
+int initrd_check(uint8_t *data) {
+	initrd_header *h = (initrd_header*)data;
+	if (h->magic == INITRD_MAGIC) return 0;
+	return -1;
+}
+
+int initrd_load(uint8_t *data, vdir *root) {
+	if (root == 0) return -1;
+
+	union {
+		uint8_t *c;
+		initrd_header *ih;
+		initrd_file_header *fh;
+	} curr;
+	curr.c = data;
+
+	if (curr.ih->magic != INITRD_MAGIC) return -2;
+
+	uint32_t files = curr.ih->files; curr.ih++;
+	for (unsigned i = 0; i < files; i++) {
+		initrd_file_header *h = curr.fh;
+		curr.fh++;
+		if (h->name_length == 0) continue;
+		char* path = (char*)curr.c;
+		curr.c += h->name_length + 1;
+		if (strlen(path) != (int)h->name_length) return -3;
+
+		node* parent = root;
+		// parse filename
+		char *member = path;
+		while (*path != 0 && parent != 0) {
+			if (*path == '/') {
+				if (member == path) {
+					member++;
+					path++;
+				} else {
+					*path = 0;
+					path++;
+					node* n = parent->get_child(member);
+					if (n == 0) {
+						n = new vdir(parent);
+						parent->add_child(member, n);
+					}
+					parent = n;
+					member = path;
+				}
+			} else {
+				path++;
+			}
+		}
+		if (parent == 0) return -5;
+		if (member == path) return -6;		// filename ended by '/', bad.
+
+		// add file
+		if (h->file_length == 0) {
+			if (parent->add_child(member, new vdir(parent)) != 0) return -4;
+		} else {
+			if (parent->add_child(member, new vfile(parent, (char*)curr.c, h->file_length)) != 0) return -4;
+			curr.c += h->file_length;
+		}
+	}
+	return 0;
+}