1 files changed, 86 insertions, 0 deletions
diff --git a/Source/Kernel/FileSystems/RamFS/RamFS.class.cpp b/Source/Kernel/FileSystems/RamFS/RamFS.class.cpp
index e69de29..c8ed27c 100644
--- a/Source/Kernel/FileSystems/RamFS/RamFS.class.cpp
+++ b/Source/Kernel/FileSystems/RamFS/RamFS.class.cpp
@@ -0,0 +1,86 @@
+#include "RamFS.class.h"
+#include <VFS/DirectoryNode.class.h>
+#include "RamFileNode.class.h"
+
+RamFS::RamFS(u32int maxSize) {
+	m_maxSize = maxSize;
+	m_usedSize = 0;
+	m_isWritable = true;
+	m_rootNode = new DirectoryNode("/", this, NULL);	
+}
+
+bool RamFS::setName(FSNode* node, String name) { return true; }
+bool RamFS::setPermissions(FSNode* node, u32int permissions) { return true; }
+bool RamFS::setUid(FSNode* node, u32int uid) { return true; }
+bool RamFS::setGid(FSNode* node, u32int gid) { return true; }
+bool RamFS::setParent(FSNode* node, FSNode* parent) {
+	if (parent->getFS() == this) return true;
+	return false;
+}
+
+u32int RamFS::read(FileNode* file, u64int position, u32int max_length, u8int *data) {
+	RamFileNode *node = (RamFileNode*) file;
+	if (file->getLength() <= position) return 0;
+	u32int length = file->getLength() - position;
+	if (length > max_length) length = max_length;
+	memcpy(data, node->m_data + position, length);
+	return length;
+}
+
+bool RamFS::write(FileNode* file, u64int position, u32int length, u8int *data) {
+	if (!m_isWritable) return false;
+	RamFileNode *node = (RamFileNode*) file;
+
+	u32int end = position + length;
+	if (end > node->getLength()) {
+		if (m_usedSize - node->getLength() + end > m_maxSize) return false;
+		m_usedSize -= node->getLength();
+		m_usedSize += end;
+
+		u8int* data = (u8int*)Mem::kalloc(end);
+		if (data == 0) return false;	//Invalid pointer
+		if (node->m_data != 0) {
+			memcpy(data, node->m_data, node->getLength());
+			Mem::kfree(node->m_data);
+		}
+		node->m_data = data;
+		node->setLength(end);
+	}
+	memcpy(node->m_data + position, data, length);
+	return true;
+}
+
+bool RamFS::truncate(FileNode* file) {
+	if (!m_isWritable) return false;
+	RamFileNode *node = (RamFileNode*) file;
+
+	Mem::kfree(node->m_data);
+	node->setLength(0);
+	node->m_data = 0;
+
+	return true;
+}
+
+bool RamFS::loadContents(DirectoryNode* dir) { return true; }	//Nothing to do.
+
+FileNode* RamFS::createFile(DirectoryNode* parent, String name) {
+	if (!m_isWritable) return NULL;
+	if (parent->getFS() != this) return NULL;
+
+	RamFileNode* n = new RamFileNode(name, this, parent);
+	parent->loadContent();
+	parent->getChildren().push(n);
+
+	return n;
+}
+
+DirectoryNode* RamFS::createDirectory(DirectoryNode* parent, String name) {
+	if (!m_isWritable) return NULL;
+	if (parent->getFS() != this) return NULL;
+
+	DirectoryNode* d = new DirectoryNode(name, this, parent);
+	parent->loadContent();
+	parent->getChildren().push(d);
+
+	return d;
+}