51 lines
897 B
Rust
51 lines
897 B
Rust
|
use nom::IResult;
|
||
|
use nom::number::complete::*;
|
||
|
|
||
|
use crate::pdata::unpack::*;
|
||
|
|
||
|
//------------------------------------------
|
||
|
|
||
|
static FLAGS_MASK: u64 = (1 << 16) - 1;
|
||
|
|
||
|
//------------------------------------------
|
||
|
|
||
|
pub enum MappingFlags {
|
||
|
Valid = 1,
|
||
|
Dirty = 2,
|
||
|
}
|
||
|
|
||
|
#[derive(Clone, Copy)]
|
||
|
pub struct Mapping {
|
||
|
pub oblock: u64,
|
||
|
pub flags: u32,
|
||
|
}
|
||
|
|
||
|
impl Mapping {
|
||
|
pub fn is_valid(&self) -> bool {
|
||
|
return (self.flags & MappingFlags::Valid as u32) != 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
impl Unpack for Mapping {
|
||
|
fn disk_size() -> u32 {
|
||
|
8
|
||
|
}
|
||
|
|
||
|
fn unpack(i: &[u8]) -> IResult<&[u8], Mapping> {
|
||
|
let (i, n) = le_u64(i)?;
|
||
|
let oblock = n >> 16;
|
||
|
let flags = n & FLAGS_MASK;
|
||
|
|
||
|
Ok((
|
||
|
i,
|
||
|
Mapping {
|
||
|
oblock,
|
||
|
flags: flags as u32,
|
||
|
},
|
||
|
))
|
||
|
}
|
||
|
}
|
||
|
|
||
|
//------------------------------------------
|