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

1 files changed, 34 insertions, 0 deletions

diff --git a/src/kernel/vfs/vfile.cpp b/src/kernel/vfs/vfile.cpp
new file mode 100644
index 0000000..ff57c9e
--- /dev/null
+++ b/src/kernel/vfs/vfile.cpp
@@ -0,0 +1,34 @@
+#include "vfile.h"
+
+vfile::vfile(node* parent, char* d, size_t s) : node(parent, FT_FILE) {
+	size = 0;
+	own_data = false;
+
+	data = d;
+	if (d != 0) size = s;
+}
+
+vfile::~vfile() {
+	if (own_data) kfree(data);
+}
+
+int vfile::read(size_t offset, size_t len, char* buffer) {
+	if (offset + len > size) len = size - offset;
+	memcpy(buffer, data + offset, len);
+	return len;
+}
+
+int vfile::write(size_t offset, size_t len, char* buffer) {
+	size_t new_size = MAX(offset + len, size);
+	if (!own_data || new_size > size) {
+		char* new_data = (char*)kmalloc(new_size);
+		memcpy(new_data, data, size);
+		if (new_size > size) memset(new_data + size, 0, new_size - size);
+		if (own_data) kfree(data);
+		data = new_data;
+		size = new_size;
+		own_data = true;
+	}
+	memcpy(data + offset, buffer, len);
+	return len;
+}