Lucas RayanandClaude Opus 5.5
beb83fef92
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
538 lines
18 KiB
Rust
538 lines
18 KiB
Rust
//! Orquestra a varredura: layout → metadados dos sistemas de arquivos →
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//! carving no espaço livre/desconhecido → fusão sem duplicatas.
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use crate::carve::{carve_range, CarveCfg, CarveEnd, CarveEvents, HitAction};
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use crate::fs::{self, merge_extents, overlaps, Ctx};
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use crate::partition;
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use crate::signatures::category_for_ext;
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use crate::source::Source;
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use crate::types::*;
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use serde::{Deserialize, Serialize};
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use std::collections::HashMap;
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use std::sync::atomic::AtomicU64;
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#[derive(Debug, Clone, Serialize, Deserialize, Default)]
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pub struct Progress {
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pub phase: String,
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pub done: u64,
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pub total: u64,
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}
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/// Receptor dos resultados (a interface/CLI implementa).
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pub trait Sink {
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fn found(&mut self, f: Found);
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/// Um achado de carving confirmou um arquivo já listado por metadados.
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fn confirm(&mut self, id: u64, confidence: Confidence);
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/// Um achado já emitido ganhou dados melhores (ex.: JPEG remontado de fragmentos).
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fn replace(&mut self, f: Found) {
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self.found(f);
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}
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fn progress(&mut self, p: Progress);
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fn warning(&mut self, w: String);
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fn layout(&mut self, l: &DiskLayout);
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}
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct RangeState {
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pub start: u64,
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pub end: u64,
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pub next: u64,
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}
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/// Estado serializável para pausar/retomar.
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#[derive(Debug, Clone, Serialize, Deserialize, Default)]
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pub struct Checkpoint {
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pub fs_done: bool,
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pub ranges: Vec<RangeState>,
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pub next_id: u64,
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pub layout: Option<DiskLayout>,
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/// A varredura parou porque o dispositivo parou de responder (desconectado?).
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#[serde(default)]
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pub io_lost: bool,
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}
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pub enum Outcome {
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Completed,
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Interrupted(Checkpoint),
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}
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pub fn run(
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src: &dyn Source,
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opts: &ScanOptions,
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resume: Option<Checkpoint>,
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existing: &[Found],
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cancelled: &(dyn Fn() -> bool + Sync),
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sink: &mut dyn Sink,
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) -> Outcome {
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let mut cp = resume.unwrap_or_default();
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let next_id = AtomicU64::new(
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cp.next_id
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.max(existing.iter().map(|f| f.id + 1).max().unwrap_or(1))
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.max(1),
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);
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sink.progress(Progress {
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phase: "Lendo tabela de partições".into(),
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done: 0,
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total: 0,
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});
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let layout = match cp.layout.clone() {
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Some(l) => l,
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None => {
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let l = partition::analyze(src, opts.mode == ScanMode::Deep);
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sink.layout(&l);
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for w in &l.warnings {
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sink.warning(w.clone());
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}
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l
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}
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};
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let mut layout = layout;
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if opts.skip_primary {
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layout.partitions.clear();
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layout.gaps.clear();
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layout.table = "membro de RAID".into();
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}
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// Volumes lógicos e outros volumes montados que não estão na tabela do disco.
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for p in &opts.extra_parts {
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if !layout.partitions.iter().any(|q| q.start == p.start) {
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let mut p = p.clone();
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p.index = layout.partitions.len();
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layout.partitions.push(p);
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}
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}
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cp.layout = Some(layout.clone());
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// Índices para fusão: primeiro offset -> (id, confiança), e extents de achados por metadados.
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let mut starts: HashMap<u64, (u64, Confidence)> = HashMap::new();
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let mut fs_extents: Vec<Extent> = vec![];
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for f in existing {
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index_found(f, &mut starts, &mut fs_extents);
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}
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if !cp.fs_done {
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let mut live_all: Vec<Extent> = vec![];
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let mut free_all: Vec<Extent> = vec![];
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let mut have_free_for: Vec<(u64, u64)> = vec![];
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for p in &layout.partitions {
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if p.encrypted.is_some() {
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continue;
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}
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let phase = format!("Lendo metadados {} (partição {})", p.fs.name(), p.index + 1);
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sink.progress(Progress {
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phase: phase.clone(),
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done: 0,
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total: 0,
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});
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let mut emit_buf: Vec<Found> = vec![];
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let res = {
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let progress_phase = phase.clone();
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let prog_cell = std::sync::Mutex::new((0u64, 0u64));
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let progress = |d: u64, t: u64| {
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*prog_cell.lock().unwrap() = (d, t);
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};
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let mut emit = |f: Found| emit_buf.push(f);
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let mut ctx = Ctx {
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src,
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next_id: &next_id,
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cancelled,
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progress: &progress,
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emit: &mut emit,
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};
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let r = match p.fs {
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FsKind::Ntfs => Some(fs::ntfs::scan(&mut ctx, p.start)),
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FsKind::Fat12 | FsKind::Fat16 | FsKind::Fat32 => {
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Some(fs::fat::scan(&mut ctx, p.start, p.fs))
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}
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FsKind::Exfat => Some(fs::exfat::scan(&mut ctx, p.start)),
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FsKind::Ext => Some(fs::ext::scan(&mut ctx, p.start, p.len)),
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FsKind::HfsPlus => Some(fs::hfsplus::scan(&mut ctx, p.start, p.len)),
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FsKind::Btrfs => Some(fs::btrfs::scan(&mut ctx, p.start, p.len)),
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FsKind::Xfs => Some(fs::xfs::scan(&mut ctx, p.start, p.len)),
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FsKind::Apfs => Some(fs::apfs::scan(&mut ctx, p.start, p.len)),
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_ => None,
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};
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let _ = progress_phase;
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r
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};
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for f in emit_buf {
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index_found(&f, &mut starts, &mut fs_extents);
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sink.found(f);
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}
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if let Some(r) = res {
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for w in r.warnings {
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sink.warning(w);
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}
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live_all.extend(r.live);
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if let Some(fr) = r.free {
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free_all.extend(fr);
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have_free_for.push((p.start, p.start + p.len));
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}
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}
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if cancelled() {
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cp.next_id = next_id.load(std::sync::atomic::Ordering::Relaxed);
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return Outcome::Interrupted(cp);
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}
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}
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cp.fs_done = true;
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cp.ranges = if opts.mode == ScanMode::Deep {
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build_ranges(
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&layout,
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&live_all,
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&free_all,
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&have_free_for,
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opts,
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src.size(),
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)
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} else {
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vec![]
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};
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}
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fs_extents = merge_extents(fs_extents);
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let total: u64 = cp.ranges.iter().map(|r| r.end - r.start).sum();
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let done: u64 = cp
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.ranges
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.iter()
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.map(|r| r.next.saturating_sub(r.start).min(r.end - r.start))
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.sum();
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let cfg = CarveCfg {
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max_size: opts.max_carve_size,
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categories: &opts.categories,
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};
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let mut handler = Handler {
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src,
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sink,
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starts,
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fs_extents,
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next_id: &next_id,
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done,
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total,
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index: crate::defrag::ClusterIndex::new(src.size()),
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pending: vec![],
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intact_mp4: vec![],
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refs: opts
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.references
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.iter()
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.filter_map(|p| {
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let s = crate::source::open_path(std::path::Path::new(p)).ok()?;
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crate::mp4rebuild::config_from_mp4(s.as_ref(), 0, s.size())
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})
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.collect(),
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carved: vec![],
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};
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for ri in 0..cp.ranges.len() {
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let (start, end) = (cp.ranges[ri].start, cp.ranges[ri].end);
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let mut next = cp.ranges[ri].next;
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if next >= end {
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continue;
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}
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let end_state = carve_range(src, start, end, &mut next, &cfg, cancelled, &mut handler);
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cp.ranges[ri].next = next;
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if end_state != CarveEnd::Done {
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cp.io_lost = end_state == CarveEnd::IoLost;
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cp.next_id = next_id.load(std::sync::atomic::Ordering::Relaxed);
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return Outcome::Interrupted(cp);
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}
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}
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handler.rebuild_pending();
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Outcome::Completed
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}
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/// Arquivo que parece quebrado: tenta recompor depois de varrer o disco todo.
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struct Pending {
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found: Found,
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hit_len: u64,
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mp4: bool,
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}
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struct Handler<'a> {
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src: &'a dyn Source,
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sink: &'a mut dyn Sink,
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starts: HashMap<u64, (u64, Confidence)>,
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fs_extents: Vec<Extent>,
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next_id: &'a AtomicU64,
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done: u64,
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total: u64,
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index: crate::defrag::ClusterIndex,
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pending: Vec<Pending>,
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/// Vídeos íntegros achados no carving (início, tamanho): fontes de SPS/PPS.
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intact_mp4: Vec<(u64, u64)>,
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refs: Vec<crate::mp4rebuild::MediaConfig>,
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/// Extents de arquivos carved já emitidos (não podem servir de fragmento para outro).
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carved: Vec<Extent>,
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}
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impl Handler<'_> {
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fn rebuild_mp4(&mut self, p: Pending, off: u64) {
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// Referências: as informadas pelo usuário e os vídeos íntegros mais próximos no disco.
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let mut refs = self.refs.clone();
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let mut near = self.intact_mp4.clone();
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near.sort_by_key(|&(o, _)| o.abs_diff(off));
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for (o, l) in near.into_iter().take(6) {
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if let Some(c) = crate::mp4rebuild::config_from_mp4(self.src, o, l) {
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refs.push(c);
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}
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}
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let Some(r) = crate::mp4rebuild::rebuild(self.src, off, p.hit_len, &refs) else {
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return;
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};
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let Ok(pre) = crate::source::read_vec(self.src, off, r.pre_len as usize) else {
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return;
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};
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let payload_len = r.payload.1 - r.payload.0;
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let mut f = p.found;
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let hdr = r.mdat_header();
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f.size = pre.len() as u64 + hdr.len() as u64 + payload_len + r.moov.len() as u64;
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f.data = DataLoc::Parts {
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parts: vec![
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Part::Bytes { bytes: pre },
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Part::Bytes { bytes: hdr },
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Part::Run {
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offset: r.payload.0,
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len: payload_len,
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},
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Part::Bytes { bytes: r.moov },
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],
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};
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f.ext = "mp4".into();
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f.name = format!("arquivo_{:06}.mp4", f.id);
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f.confidence = Confidence::Medium;
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f.note = Some(format!(
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"índice (moov) reconstruído: {} quadros {}x{} a {:.1} fps, sem áudio; ajuste de tempo aproximado",
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r.frames, r.width, r.height, r.fps
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));
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self.carved.push(Extent::new(r.payload.0, payload_len));
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self.sink.replace(f);
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}
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fn rebuild_pending(&mut self) {
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let pend = std::mem::take(&mut self.pending);
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for p in pend {
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let off = p.found.first_offset().unwrap_or(0);
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if p.mp4 {
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self.rebuild_mp4(p, off);
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continue;
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}
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let mut used = self.fs_extents.clone();
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used.extend(self.carved.iter().copied());
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// O próprio começo do arquivo não conta como "ocupado" para ele mesmo.
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used.retain(|e| !(e.offset == off));
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let pool = crate::defrag::Pool {
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index: &self.index,
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used: &used,
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};
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if let crate::defrag::Analysis::Rebuilt { extents, size } =
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crate::defrag::analyze_jpeg(self.src, off, p.hit_len, &pool, true)
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{
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let mut f = p.found;
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f.size = size;
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f.data = DataLoc::Extents {
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extents: extents.clone(),
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};
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f.confidence = Confidence::Medium;
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f.note = Some(format!(
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"remontado a partir de {} fragmentos separados no disco; confira a imagem",
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extents.len()
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));
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self.carved.extend(extents);
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self.sink.replace(f);
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}
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}
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}
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}
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impl CarveEvents for Handler<'_> {
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fn chunk(&mut self, abs: u64, data: &[u8]) {
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self.index.scan_chunk(abs, data);
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}
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fn advance(&mut self, n: u64) {
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self.done += n;
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self.sink.progress(Progress {
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phase: "Varredura profunda por assinatura".into(),
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done: self.done.min(self.total),
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total: self.total,
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});
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}
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fn hit(&mut self, off: u64, hit: &crate::signatures::Hit) -> HitAction {
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if let Some(&(id, conf)) = self.starts.get(&off) {
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if hit.confidence > conf {
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self.sink.confirm(id, hit.confidence);
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self.starts.insert(off, (id, hit.confidence));
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}
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return HitAction::Skip;
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}
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if overlaps(&self.fs_extents, off, 1) {
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return HitAction::Continue; // dentro de arquivo já listado (ex.: miniatura embutida)
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}
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let mut hit = hit.clone();
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let mut skip_len = None;
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let mut pending_len = None;
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if hit.ext == "jpg" {
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let pool = crate::defrag::Pool {
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index: &self.index,
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used: &[],
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};
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match crate::defrag::analyze_jpeg(self.src, off, hit.len, &pool, false) {
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crate::defrag::Analysis::Intact { len } => {
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hit.len = len;
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hit.confidence = Confidence::High;
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}
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crate::defrag::Analysis::Broken { good_len } => {
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pending_len = Some(hit.len);
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hit.len = good_len;
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hit.confidence = Confidence::Low;
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skip_len = Some(good_len);
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}
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crate::defrag::Analysis::Unsupported | crate::defrag::Analysis::Rebuilt { .. } => {}
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}
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}
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let mut pending_mp4 = false;
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if matches!(hit.ext, "mp4" | "mov" | "m4v" | "3gp") {
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if hit.confidence == Confidence::High {
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self.intact_mp4.push((off, hit.len));
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} else {
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pending_mp4 = true;
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pending_len = Some(hit.len);
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}
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}
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let hit = &hit;
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let id = self
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.next_id
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.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
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let f = Found {
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id,
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name: format!("arquivo_{id:06}.{}", hit.ext),
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dir: None,
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ext: hit.ext.to_string(),
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category: category_for_ext(hit.ext),
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size: hit.len,
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origin: Origin::Carved,
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confidence: hit.confidence,
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data: DataLoc::Extents {
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extents: vec![Extent::new(off, hit.len)],
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},
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modified: None,
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created: None,
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accessed: None,
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taken: None,
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camera: None,
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px: None,
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gps: false,
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sig: None,
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note: if hit.confidence == Confidence::Low {
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Some("sem rodapé/estrutura completa: pode estar truncado".into())
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} else {
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None
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},
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};
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self.starts.insert(off, (id, hit.confidence));
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self.carved.push(Extent::new(off, hit.len));
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if let Some(hl) = pending_len {
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let mut pf = f.clone();
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pf.note = Some(if pending_mp4 {
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"vídeo sem índice (moov)".into()
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} else {
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"JPEG interrompido ou fragmentado".into()
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});
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self.pending.push(Pending {
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found: pf,
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hit_len: hl,
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mp4: pending_mp4,
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});
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}
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self.sink.found(f);
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match skip_len {
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Some(n) => HitAction::SkipLen(n),
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None => HitAction::Skip,
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}
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}
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}
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fn index_found(f: &Found, starts: &mut HashMap<u64, (u64, Confidence)>, ex: &mut Vec<Extent>) {
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if let DataLoc::Extents { extents } = &f.data {
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if let Some(o) = f.first_offset() {
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starts.insert(o, (f.id, f.confidence));
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}
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ex.extend(extents.iter().filter(|e| !e.sparse).copied());
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}
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}
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fn build_ranges(
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layout: &DiskLayout,
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live: &[Extent],
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free: &[Extent],
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have_free_for: &[(u64, u64)],
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opts: &ScanOptions,
|
|
disk_size: u64,
|
|
) -> Vec<RangeState> {
|
|
let live = merge_extents(live.to_vec());
|
|
let free = merge_extents(free.to_vec());
|
|
let mut out: Vec<Extent> = vec![];
|
|
for p in &layout.partitions {
|
|
if p.encrypted.is_some() || opts.covered.contains(&p.start) {
|
|
continue;
|
|
}
|
|
let whole = Extent::new(p.start, p.len.min(disk_size.saturating_sub(p.start)));
|
|
if opts.include_allocated {
|
|
out.push(whole);
|
|
} else if have_free_for
|
|
.iter()
|
|
.any(|&(s, e)| s == p.start && e == p.start + p.len)
|
|
{
|
|
out.extend(clip(&free, whole));
|
|
} else if p.fs.has_metadata_scanner() {
|
|
out.extend(subtract(whole, &live));
|
|
} else {
|
|
out.push(whole);
|
|
}
|
|
}
|
|
for g in &layout.gaps {
|
|
out.push(Extent::new(g.start, g.len));
|
|
}
|
|
if layout.partitions.is_empty() && layout.gaps.is_empty() {
|
|
out.push(Extent::new(0, disk_size));
|
|
}
|
|
merge_extents(out)
|
|
.into_iter()
|
|
.filter(|e| e.len >= 4096)
|
|
.map(|e| RangeState {
|
|
start: e.offset,
|
|
end: e.end(),
|
|
next: e.offset,
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
fn clip(sorted: &[Extent], window: Extent) -> Vec<Extent> {
|
|
sorted
|
|
.iter()
|
|
.filter_map(|e| {
|
|
let s = e.offset.max(window.offset);
|
|
let t = e.end().min(window.end());
|
|
(t > s).then(|| Extent::new(s, t - s))
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
fn subtract(window: Extent, sorted_live: &[Extent]) -> Vec<Extent> {
|
|
let mut out = vec![];
|
|
let mut cur = window.offset;
|
|
let i = sorted_live.partition_point(|e| e.end() <= window.offset);
|
|
for e in &sorted_live[i..] {
|
|
if e.offset >= window.end() {
|
|
break;
|
|
}
|
|
if e.offset > cur {
|
|
out.push(Extent::new(cur, e.offset - cur));
|
|
}
|
|
cur = cur.max(e.end());
|
|
}
|
|
if cur < window.end() {
|
|
out.push(Extent::new(cur, window.end() - cur));
|
|
}
|
|
out
|
|
}
|