73 lines
1.4 KiB
Rust
73 lines
1.4 KiB
Rust
use anyhow::Result;
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use byteorder::WriteBytesExt;
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use nom::number::complete::*;
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use nom::IResult;
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use crate::pdata::unpack::*;
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//------------------------------------------
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pub const MAX_ORIGIN_BLOCKS: u64 = 1 << 48;
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const FLAGS_MASK: u64 = (1 << 16) - 1;
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//------------------------------------------
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pub enum MappingFlags {
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Valid = 1,
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Dirty = 2,
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}
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#[derive(Clone, Copy)]
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pub struct Mapping {
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pub oblock: u64,
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pub flags: u32,
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}
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impl Mapping {
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pub fn is_valid(&self) -> bool {
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(self.flags & MappingFlags::Valid as u32) != 0
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}
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pub fn is_dirty(&self) -> bool {
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(self.flags & MappingFlags::Dirty as u32) != 0
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}
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}
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impl Unpack for Mapping {
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fn disk_size() -> u32 {
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8
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}
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fn unpack(i: &[u8]) -> IResult<&[u8], Mapping> {
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let (i, n) = le_u64(i)?;
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let oblock = n >> 16;
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let flags = n & FLAGS_MASK;
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Ok((
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i,
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Mapping {
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oblock,
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flags: flags as u32,
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},
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))
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}
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}
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impl Pack for Mapping {
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fn pack<W: WriteBytesExt>(&self, data: &mut W) -> Result<()> {
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let m: u64 = (self.oblock << 16) | self.flags as u64;
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m.pack(data)
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}
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}
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impl Default for Mapping {
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fn default() -> Self {
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Mapping {
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oblock: 0,
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flags: 0,
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}
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}
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}
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//------------------------------------------
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