1 files changed, 110 insertions, 0 deletions
diff --git a/Source/Kernel/VFS/File.class.cpp b/Source/Kernel/VFS/File.class.cpp
new file mode 100644
index 0000000..ba837e9
--- /dev/null
+++ b/Source/Kernel/VFS/File.class.cpp
@@ -0,0 +1,110 @@
+#include "File.class.h"
+#include <VFS/VFS.ns.h>
+#include <TaskManager/Task.ns.h>
+
+File::File() : m_file(NULL), m_valid(false), m_writable(false), m_position(0) {
+}
+
+File::File(String filename, u8int mode, FSNode* start) :
+	m_file(NULL), m_valid(false), m_writable(false), m_position(0) {
+	open(filename, mode, start);
+}
+
+File::~File() {
+	close();
+}
+
+bool File::open(String filename, u8int mode, FSNode* start) {
+	if (m_valid) return false;
+
+	FSNode* node = VFS::find(filename, start);
+	if (node == NULL) return false;
+	if (node->type() != NT_FILE) return false;
+
+	m_file = (FileNode*) node;
+
+	m_writable = (mode != FM_READ);
+	if (!m_file->writable() and m_writable) return false;
+
+	if (mode == FM_READ or mode == FM_REPLACE) {
+		m_position = 0;
+	} else if (mode == FM_TRUNCATE) {
+		if (!m_file->truncate()) return false;
+		m_position = 0;
+	} else if (mode == FM_APPEND) {
+		m_position = m_file->getLength();
+	}
+
+	if (m_writable)
+		m_file->m_readers++;
+	else
+		m_file->m_writers++;
+
+	Task::currentProcess->registerFileDescriptor(this);
+	m_valid = true;
+	return true;
+}
+
+u32int File::read(u32int max_length, u8int *data) {
+	if (!m_valid) return 0;
+	u32int l = m_file->read(m_position, max_length, data);
+	m_position += l;
+	return l;
+}
+
+bool File::write(u32int length, u8int *data) {
+	if (!m_valid) return false;
+	if (!m_writable) return false;
+	if (m_file->write(m_position, length, data)) {
+		m_position += length;
+		return true;
+	}
+	return false;
+}
+
+bool File::seek(u64int count, u8int mode) {
+	if (!m_valid) return false;
+	if (mode == SM_FORWARD) {
+		if (m_position + count <= m_file->getLength()) {
+			m_position += count;
+			return true;
+		} else {
+			return false;
+		}
+	} else if (mode == SM_BACKWARD) {
+		if (count <= m_position) {
+			m_position -= count;
+			return true;
+		} else {
+			return false;
+		}
+	} else if (mode == SM_BEGINNING) {
+		if (count <= m_file->getLength()) {
+			m_position = count;
+			return true;
+		} else {
+			return false;
+		}
+	} else if (mode == SM_END) {
+		if (count <= m_file->getLength()) {
+			m_position = m_file->getLength() - count;
+			return true;
+		} else {
+			return false;
+		}
+	}
+	return false;
+}
+
+void File::close(bool unregisterFD) {
+	if (!m_valid) return;
+	if (m_writable)
+		m_file->m_writers--;
+	else
+		m_file->m_readers--;
+	m_valid = false;
+	m_file = NULL;
+	m_position = 0;
+	m_writable = false;
+	if (unregisterFD) Task::currentProcess->unregisterFileDescriptor(this);
+}