Xavier L'Heureux
58 lines
1.1 KiB
Rust
58 lines
1.1 KiB
Rust
use std::cmp::min;
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use BLOCK_SIZE;
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pub struct BlockIter {
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block: u64,
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length: u64,
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i: u64,
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}
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impl Iterator for BlockIter {
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type Item = (u64, u64);
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fn next(&mut self) -> Option<Self::Item> {
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if self.i < (self.length + BLOCK_SIZE - 1) / BLOCK_SIZE {
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let ret = Some((
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self.block + self.i,
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min(BLOCK_SIZE, self.length - self.i * BLOCK_SIZE),
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));
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self.i += 1;
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ret
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} else {
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None
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}
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}
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}
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/// A disk extent, [wikipedia](https://en.wikipedia.org/wiki/Extent_(file_systems))
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#[derive(Copy, Clone, Debug, Default)]
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#[repr(packed)]
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pub struct Extent {
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pub block: u64,
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pub length: u64,
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}
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impl Extent {
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pub fn default() -> Extent {
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Extent {
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block: 0,
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length: 0,
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}
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}
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pub fn new(block: u64, length: u64) -> Extent {
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Extent {
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block: block,
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length: length,
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}
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}
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pub fn blocks(&self) -> BlockIter {
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BlockIter {
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block: self.block,
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length: self.length,
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i: 0,
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}
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}
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}
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