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#include "RamFS.class.h"
#include <VFS/DirectoryNode.class.h>
#include "RamFileNode.class.h"
RamFS::RamFS() {
}
RamFS::~RamFS() {
delete m_rootNode;
}
RamFS* RamFS::mount(u32int maxSize, DirectoryNode* mountpoint) {
RamFS* rfs = new RamFS();
rfs->m_maxSize = maxSize;
rfs->m_usedSize = 0;
rfs->m_isWritable = true;
rfs->m_rootNode = new DirectoryNode("/", rfs, mountpoint);
return rfs;
}
RamFS* RamFS::mount(u8int *ptr, u32int maxSize, DirectoryNode* mountpoint, bool writable) {
RamFS* rfs = new RamFS();
rfs->m_maxSize = maxSize;
rfs->m_usedSize = 0;
rfs->m_isWritable = true;
rfs->m_rootNode = new DirectoryNode("/", rfs, mountpoint);
union {
u8int* c;
initrd_header* i;
initrd_file_header* f;
} curr;
curr.c = ptr;
if (curr.i->magic != INITRD_MAGIC) {
delete rfs;
return NULL;
}
u32int files = curr.i->files;
curr.i++; //Increment pointer of size of initrd header
for (u32int i = 0; i < files; i++) {
initrd_file_header h = *(curr.f);
curr.f++; //Increment pointer of size of file header
if (h.name_length != 0 or h.file_length != 0) {
String name((const char*)(curr.c));
curr.c += h.name_length + 1; //Increment pointer of length of name
//Find out a vector containing parent directories, and set name to the effective file name
if (name[0] == WChar("/")) name = name.substr(1, name.size() - 1);
//Find node for parent directory
String mname = "";
DirectoryNode* parent = rfs->m_rootNode;
for (u32int i = 0; i < name.size(); i++) {
if (name[i] == WChar("/")) {
FSNode* n = parent->getChild(mname);
if (n == NULL) break;
if (n->type() != NT_DIRECTORY) break;
parent = (DirectoryNode*)n;
mname.clear();
} else {
mname += name[i];
}
}
name = mname;
//Add new node
if (h.file_length == 0) {
parent->createDirectory(name);
} else {
FileNode* file = parent->createFile(name);
file->write(0, h.file_length, curr.c);
curr.c += h.file_length;
}
}
}
return rfs;
}
bool RamFS::unmount() {
return m_rootNode->unmountable();
}
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::alloc(end);
if (data == 0) return false; //Invalid pointer
if (node->m_data != 0) {
memcpy(data, node->m_data, node->getLength());
Mem::free(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::free(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;
}
bool RamFS::remove(DirectoryNode* parent, FSNode* node) {
if (node->type() == NT_FILE) {
u8int *d = ((RamFileNode*)node)->m_data;
if (d != 0) Mem::free(d);
}
return true;
}
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