gctf2023/pwn/flipper/dist/common/source/fs/ramfs/RamFSInode.cpp

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2023-11-24 18:11:34 +00:00
#include "fs/ramfs/RamFSInode.h"
#include "kstring.h"
#include "assert.h"
#include "fs/ramfs/RamFSSuperblock.h"
#include "fs/ramfs/RamFSFile.h"
#include "fs/Dentry.h"
#include "FileSystemType.h"
#include "console/kprintf.h"
#define BASIC_ALLOC 256
RamFSInode::RamFSInode(Superblock *super_block, uint32 inode_type) :
Inode(super_block, inode_type),
data_(0)
{
debug(RAMFS, "New RamFSInode %p\n", this);
if (inode_type == I_FILE)
{
data_ = new char[BASIC_ALLOC]();
i_size_ = BASIC_ALLOC;
}
}
RamFSInode::~RamFSInode()
{
debug(RAMFS, "Destroying RamFSInode %p\n", this);
delete[] data_;
}
int32 RamFSInode::readData(uint32 offset, uint32 size, char *buffer)
{
if(offset >= getSize())
{
return 0;
}
uint32 read_size = Min(size, getSize() - offset);
char *ptr_offset = data_ + offset;
memcpy(buffer, ptr_offset, read_size);
return read_size;
}
int32 RamFSInode::writeData(uint32 offset, uint32 size, const char *buffer)
{
assert(i_type_ == I_FILE);
if(offset >= getSize())
{
return 0;
}
uint32 write_size = Min(size, getSize() - offset);
if(write_size != size)
{
debug(RAMFS, "WARNING: RamFS currently does not support expanding files via the write syscall\n");
}
char *ptr_offset = data_ + offset;
memcpy(ptr_offset, buffer, write_size);
return write_size;
}
File* RamFSInode::open(Dentry* dentry, uint32 flag)
{
debug(INODE, "%s Inode: Open file\n", getSuperblock()->getFSType()->getFSName());
assert(ustl::find(i_dentrys_.begin(), i_dentrys_.end(), dentry) != i_dentrys_.end());
File* file = (File*) (new RamFSFile(this, dentry, flag));
i_files_.push_back(file);
getSuperblock()->fileOpened(file);
return file;
}