mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-05-20 01:08:06 +00:00
7cfdffbd71
* Fix several overflows in box and track processing * Use size_of::<Type>() instead of magic numbers * Fix a panic in Mp4Track::read_sample() for one-past-the-end This appears to be a bug unmasked by other changes. read_sample() calls sample_offset() then sample_size(), and assumes that if the former returns Ok then the latter does as well. However, if the sample_id is one past the end, sample_offset() might succeed (it only checks samples _up to_ the given sample_id but not _including_ it) while sample_size() fails (because the sample doesn't exist). read_sample() will then panic. Fix this by duplicating the error propagation (that is currently done for sample_offset) for sample_size, instead of unwrapping. This is a cautious change that fixes the bug; alternatively, having sample_offset() call sample_size() on the given sample_id and propagate any error might also work. * Account for header size in box processing overflow fixes * Ensure that boxes aren't bigger than their containers Together with the entry_count checks, this eliminates several OOMs when reading incorrect mp4 files. * Fix order of arithmetic operations This was due to an incorrect transcription when switching to checked arithmetic, and fixes a bug that could cause attempted lookups of the wrong chunk_id.
86 lines
1.9 KiB
Rust
86 lines
1.9 KiB
Rust
use serde::Serialize;
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use std::io::{Read, Seek, Write};
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use crate::mp4box::elst::ElstBox;
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize)]
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pub struct EdtsBox {
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pub elst: Option<ElstBox>,
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}
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impl EdtsBox {
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pub(crate) fn new() -> EdtsBox {
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Default::default()
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}
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pub fn get_type(&self) -> BoxType {
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BoxType::EdtsBox
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}
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pub fn get_size(&self) -> u64 {
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let mut size = HEADER_SIZE;
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if let Some(ref elst) = self.elst {
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size += elst.box_size();
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}
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size
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}
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}
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impl Mp4Box for EdtsBox {
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fn box_type(&self) -> BoxType {
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self.get_type()
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}
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fn box_size(&self) -> u64 {
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self.get_size()
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}
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fn to_json(&self) -> Result<String> {
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Ok(serde_json::to_string(&self).unwrap())
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}
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fn summary(&self) -> Result<String> {
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let s = String::new();
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Ok(s)
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}
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}
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impl<R: Read + Seek> ReadBox<&mut R> for EdtsBox {
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fn read_box(reader: &mut R, size: u64) -> Result<Self> {
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let start = box_start(reader)?;
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let mut edts = EdtsBox::new();
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let header = BoxHeader::read(reader)?;
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let BoxHeader { name, size: s } = header;
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if s > size {
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return Err(Error::InvalidData(
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"edts box contains a box with a larger size than it",
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));
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}
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if let BoxType::ElstBox = name {
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let elst = ElstBox::read_box(reader, s)?;
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edts.elst = Some(elst);
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}
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skip_bytes_to(reader, start + size)?;
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Ok(edts)
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}
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}
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impl<W: Write> WriteBox<&mut W> for EdtsBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(self.box_type(), size).write(writer)?;
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if let Some(ref elst) = self.elst {
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elst.write_box(writer)?;
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}
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Ok(size)
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}
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}
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