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Fix for overly harsh checks when checking Merkle trees. #289

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merged 4 commits into from
Aug 10, 2023
Merged

Fix for overly harsh checks when checking Merkle trees. #289

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d23c759
Fix for overly harsh checks when checking Merkle trees.
mauricefisher64 Aug 3, 2023
3caa54d
Code simplification
mauricefisher64 Aug 7, 2023
9fade77
Fix missing id field from jumbf box reading.
mauricefisher64 Aug 10, 2023
442f773
clippy fixes
mauricefisher64 Aug 10, 2023
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30 changes: 2 additions & 28 deletions sdk/src/assertions/bmff_hash.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -609,33 +609,13 @@ impl BmffHash {
}
};

let sample_cnt = mp4.sample_count(mm.local_id).map_err(|_e| {
Error::InvalidAsset("Could not parse BMFF track sample".to_string())
})?;

let sample_cnt = track.sample_count();
if sample_cnt == 0 {
return Err(Error::InvalidAsset("No samples".to_string()));
}

let track_id = track.track_id();

// get the chunk count
let stbl_box = &track.trak.mdia.minf.stbl;
let chunk_cnt = match &stbl_box.stco {
Some(stco) => stco.entries.len(),
None => match &stbl_box.co64 {
Some(co64) => co64.entries.len(),
None => 0,
},
};

// the Merkle count is the number of chunks for timed media
if mm.count != chunk_cnt as u32 {
return Err(Error::HashMismatch(
"Track count does not match Merkle map count".to_string(),
));
}

// create sample to chunk mapping
// create the Merkle tree per samples in a chunk
let mut chunk_hash_map: HashMap<u32, Hasher> = HashMap::new();
Expand Down Expand Up @@ -684,19 +664,13 @@ impl BmffHash {
}
}

if chunk_cnt != chunk_hash_map.len() {
return Err(Error::HashMismatch(
"Incorrect number of Merkle trees".to_string(),
));
}

// finalize leaf hashes
let mut leaf_hashes = Vec::new();
for chunk_bmff_mm in &track_to_bmff_merkle_map[&track_id] {
match chunk_hash_map.remove(&(chunk_bmff_mm.location + 1)) {
Some(h) => {
let h = Hasher::finalize(h);
leaf_hashes.push(h.clone());
leaf_hashes.push(h);
}
None => {
return Err(Error::HashMismatch(
Expand Down