use std::{    io::Write,    panic::{AssertUnwindSafe, catch_unwind},    path::PathBuf,}; use gix_pack::data; #[test]fn artifact_inputs_can_be_opened_without_panicking() {    for path in crate::fuzz_artifact_paths("data_file") {        _ = data::File::from_data(            std::fs::read(&path).expect("artifact is readable"),            path,            gix_hash::Kind::Sha1,        );    }} /// Reproducer for the truncated ref-delta metadata fuzz case: malformed entry data must not panic/// while attempting to read the base object id.#[test]fn truncated_ref_delta_metadata_is_reported_without_panicking() {    let result = catch_unwind(|| data::Entry::from_bytes(&[0x70], 0, gix_hash::Kind::Sha1));     assert!(        result            .expect("truncated ref-delta metadata should not panic during entry decoding")            .is_err(),        "truncated ref-delta metadata should be rejected as corrupt input"    );} /// Reproducer for the oversized pack header fuzz case: malformed entry headers with too many/// continuation bytes must not panic while decoding the first object entry.#[test]fn oversized_pack_entry_header_is_reported_without_panicking() {    let data = [        b'P', b'A', b'C', b'K', 0, 0, 0, 2, 0, 0, 0, 1, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,        0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,    ];    let file = data::File::from_data(        data.as_slice(),        PathBuf::from("fuzzed-header.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid");    let result = catch_unwind(AssertUnwindSafe(|| file.entry(12)));     assert!(        result            .expect("forged pack entry headers should not panic during entry decoding")            .is_err(),        "forged pack entry headers should be rejected as corrupt pack data"    );} #[test]fn non_canonical_pack_entry_header_is_accepted() {    fn deflate(bytes: &[u8]) -> Vec<u8> {        let mut out = gix_zlib::stream::deflate::Write::new(Vec::new(), gix_zlib::Compression::BEST_SPEED);        out.write_all(bytes).expect("writing to deflater succeeds");        out.flush().expect("flushing deflater succeeds");        out.into_inner()    }     let mut bytes = data::header::encode(data::Version::V2, 1).to_vec();    bytes.extend_from_slice(&[0xb3, 0x00]);    bytes.extend_from_slice(&deflate(b"20\n"));    bytes.extend_from_slice(&[0; 20]);     let file = data::File::from_data(        bytes.as_slice(),        PathBuf::from("non-canonical-header.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid");    let entry = file        .entry(12)        .expect("git-compatible non-canonical entry header is accepted");    assert_eq!(entry.header_size(), 2, "the actual header size is retained");    assert_eq!(entry.pack_offset(), 12, "the entry start remains recoverable");     let mut out = Vec::new();    let outcome = file        .decode_entry(            entry,            &mut out,            &mut Default::default(),            &|_, _| None,            &mut gix_pack::cache::Never,        )        .expect("non-canonical entry decodes like a canonical git object");     assert_eq!(out, b"20\n");    assert_eq!(outcome.kind, gix_object::Kind::Blob);    assert_eq!(outcome.object_size, 3);} /// Reproducer for the large-allocation fuzz case: attacker-controlled object sizes must not cause/// `decode_entry()` to attempt multi-gigabyte allocations.#[test]fn oversized_declared_object_size_is_reported_without_panicking() {    let mut bytes = data::header::encode(data::Version::V2, 1).to_vec();    data::entry::Header::Blob        .write_to((i32::MAX as u64) + 1, &mut bytes)        .expect("header write succeeds");    bytes.extend_from_slice(&[0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01]);    bytes.extend_from_slice(&[0; 20]);     let file = data::File::from_data(bytes.as_slice(), PathBuf::from("fuzzed-oom.pack"), gix_hash::Kind::Sha1)        .expect("pack header is syntactically valid")        .with_alloc_limit_bytes(Some(4_000_000));    let entry = file.entry(12).expect("entry metadata is parseable");     let result = catch_unwind(AssertUnwindSafe(|| {        file.decode_entry(            entry,            &mut Vec::new(),            &mut Default::default(),            &|_, _| None,            &mut gix_pack::cache::Never,        )    }));     assert!(        result            .expect("oversized declared object sizes should not abort while decoding")            .is_err(),        "oversized declared object sizes should be rejected"    );} /// Reproducer for the allocation-limit fuzz case: with a configured cap, attacker-controlled/// object sizes must fail with `OutOfMemory` instead of attempting the allocation or panicking.#[test]fn declared_object_size_over_alloc_limit_bytes_is_reported_as_out_of_memory() {    fn deflate(bytes: &[u8]) -> Vec<u8> {        let mut out = gix_zlib::stream::deflate::Write::new(Vec::new(), gix_zlib::Compression::BEST_SPEED);        out.write_all(bytes).expect("writing to deflater succeeds");        out.flush().expect("flushing deflater succeeds");        out.into_inner()    }     let object = [0u8; 65];    let mut bytes = data::header::encode(data::Version::V2, 1).to_vec();    data::entry::Header::Blob        .write_to(object.len() as u64, &mut bytes)        .expect("header write succeeds");    bytes.extend_from_slice(&deflate(&object));    bytes.extend_from_slice(&[0; 20]);     let file = data::File::from_data(        bytes.as_slice(),        PathBuf::from("fuzzed-alloc-limit.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(64));    let entry = file.entry(12).expect("entry metadata is parseable");     let result = catch_unwind(AssertUnwindSafe(|| {        file.decode_entry(            entry,            &mut Vec::new(),            &mut Default::default(),            &|_, _| None,            &mut gix_pack::cache::Never,        )    }));     assert!(        matches!(            result.expect("configured allocation limits must not cause panics"),            Err(gix_pack::data::decode::Error::OutOfMemory)        ),        "pack-controlled allocations larger than the configured limit must be rejected"    );} /// Reproducer for the fuzz target OOM case: with the same allocation cap used by the fuzz harness,/// malformed delta chains must be rejected without panicking or tripping allocator aborts.#[test]fn runaway_delta_allocation_is_rejected_with_fuzz_alloc_limit() {    let bytes = [        0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0xf2, 0x00, 0x00, 0xdd, 0x09, 0x96, 0x98, 0xe7, 0x6c, 0x01,        0x78, 0x9c, 0x7a, 0x73, 0x6a, 0xfd, 0xff, 0x9b, 0x9b, 0x9b, 0x9b, 0x9b, 0x00, 0x5b,    ];    let file = data::File::from_data(        bytes.as_slice(),        PathBuf::from("fuzzed-runaway-delta-allocation.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(64 * 1024 * 1024));    let len = bytes.len() as u64;    let mut offsets = vec![0, 12.min(len - 1), (len - 1) / 2];    let mut first_eight = [0u8; 8];    first_eight.copy_from_slice(&bytes[..8]);    offsets.push(u64::from_le_bytes(first_eight) % len);    offsets.sort_unstable();    offsets.dedup();     let mut saw_parseable_entry = false;    for offset in offsets {        let Ok(entry) = file.entry(offset) else {            continue;        };        saw_parseable_entry = true;        let result = catch_unwind(AssertUnwindSafe(|| {            file.decode_entry(                entry,                &mut Vec::new(),                &mut Default::default(),                &|_, _| None,                &mut gix_pack::cache::Never,            )        }));         assert!(            result                .expect("fuzz-target allocation caps must prevent allocator aborts")                .is_err(),            "malformed delta chains should be rejected under the fuzz allocation cap"        );    }    assert!(        saw_parseable_entry,        "the reproducer should exercise at least one parseable entry"    );} /// Reproducer for the invalid ofs-delta base-distance fuzz case: a delta whose base distance points/// before the beginning of the pack must be rejected without panicking.#[test]fn invalid_ofs_delta_base_distance_is_reported_without_panicking() {    let mut bytes = data::header::encode(data::Version::V2, 1).to_vec();    data::entry::Header::OfsDelta { base_distance: 13 }        .write_to(1, &mut bytes)        .expect("header write succeeds");    bytes.extend_from_slice(&[0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01]);    bytes.extend_from_slice(&[0; 20]);     let file = data::File::from_data(        bytes.as_slice(),        PathBuf::from("fuzzed-invalid-ofs-delta.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(8 * 1024 * 1024));    let entry = file.entry(12).expect("entry metadata is parseable");     let result = catch_unwind(AssertUnwindSafe(|| {        file.decode_entry(            entry,            &mut Vec::new(),            &mut Default::default(),            &|_, _| None,            &mut gix_pack::cache::Never,        )    }));     assert!(        result            .expect("invalid ofs-delta base distances must not panic")            .is_err(),        "invalid ofs-delta base distances should be rejected as corrupt pack data"    );} /// Reproducer for the out-of-bounds data-offset fuzz case: malformed entry headers can produce an/// entry whose data offset points past the available pack data, which must be rejected without/// panicking during decompression.#[test]fn out_of_bounds_entry_data_offset_is_reported_without_panicking() {    let data = [        0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x09, 0x97, 0x0e, 0x78, 0x9c, 0x95, 0x8b,        0x51, 0x0a, 0x83, 0x30, 0x10, 0x44, 0xff, 0x3d, 0x45, 0xa0, 0x9f, 0xa5, 0xb2, 0x89, 0x9b, 0x44, 0xa1, 0x94,        0x5e, 0xa2, 0xff, 0x6e, 0xe2, 0xc6, 0x0a, 0xd5, 0x48, 0x5c, 0xef, 0xdf, 0xf4, 0x08, 0x9d, 0x81, 0x07, 0x03,        0x6f, 0xa4, 0x30, 0xab, 0x08, 0x88, 0xce, 0x76, 0x64, 0x7c, 0xb0, 0x11, 0x27, 0xb6, 0xc1, 0x38, 0xe3, 0x23,        0x83, 0x4d, 0x5c, 0x6b, 0x89, 0x19, 0x23, 0x63, 0x6a, 0x76, 0x2a, 0xbc, 0x89, 0xc2, 0xc1, 0x5b, 0x5b, 0x5b,        0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x5b, 0x20, 0x74, 0x04, 0xb2,        0xcc, 0x61, 0xcf, 0x52, 0x32, 0x5c, 0x73, 0xb7, 0x70, 0x02, 0xc9, 0x4d, 0x7e, 0x21, 0x51, 0x3d, 0x65, 0xbf,        0xed, 0x17, 0x64, 0x0b, 0xa2, 0x98, 0x0a, 0x8f, 0x1e, 0xbb, 0x5e, 0x87, 0x35, 0xdb, 0xc3, 0x19, 0xcc, 0x1e,        0x23, 0x2f, 0xd2, 0x9f, 0xd1, 0xb3, 0x8c, 0x39, 0xcf, 0x5e, 0xf4, 0x73, 0x66, 0x4f, 0x38, 0x38, 0x57, 0xd4,        0x30, 0x56, 0x0b, 0x5e, 0x41, 0x0f, 0x17, 0xf0, 0xb5, 0xb2, 0xdb, 0xd1, 0xf1, 0x4d, 0xc3, 0xfe, 0xdf, 0x78,        0x0b, 0xe7, 0xc1, 0x84, 0x5a, 0x76, 0xda, 0x22, 0x16, 0x0c, 0x84, 0xae, 0xe0, 0xe3, 0x18, 0x94, 0x11, 0xd1,        0x05, 0x0c, 0x9f, 0x41, 0x56, 0x80, 0x4a, 0xdd, 0x35, 0x26, 0xef, 0xe0, 0x6b, 0xf7, 0x61, 0x6f, 0xef, 0x81,        0x00, 0x2c, 0x54, 0x8b, 0xe4, 0xcf, 0x65, 0x9a, 0xeb, 0x44,    ];    let file = data::File::from_data(        data.as_slice(),        PathBuf::from("fuzzed-out-of-bounds-data-offset.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(8 * 1024 * 1024));    let len = data.len() as u64;    let mut offsets = vec![0, 12.min(len - 1), (len - 1) / 2];    let mut first_eight = [0u8; 8];    first_eight.copy_from_slice(&data[..8]);    offsets.push(u64::from_le_bytes(first_eight) % len);    offsets.sort_unstable();    offsets.dedup();     let mut saw_parseable_entry = false;    for offset in offsets {        let Ok(entry) = file.entry(offset) else {            continue;        };        saw_parseable_entry = true;         let result = catch_unwind(AssertUnwindSafe(|| {            file.decode_entry(                entry,                &mut Vec::new(),                &mut Default::default(),                &|_, _| None,                &mut gix_pack::cache::Never,            )        }));         let outcome = result.expect("out-of-bounds entry data offsets must not panic");        if outcome.is_err() {            return;        }    }     assert!(        saw_parseable_entry,        "at least one fuzz-selected offset should parse into an entry"    );    panic!("out-of-bounds entry data offsets should be rejected as corrupt pack data");} /// Reproducer for the malformed delta-rescue fuzz case: degenerate delta metadata can force the/// internal instruction buffer relocation path, which must not panic while moving bytes around.#[test]fn malformed_delta_instruction_relocation_is_reported_without_panicking() {    let data = [        0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0x29, 0x00, 0x00, 0x09, 0x97, 0x21, 0x21, 0x21, 0x21, 0x21,        0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,        0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,        0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,        0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21,        0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x21, 0x51, 0x00, 0x00, 0x00, 0x00, 0xe8, 0x03, 0x45, 0xcf,    ];    let file = data::File::from_data(        data.as_slice(),        PathBuf::from("fuzzed-delta-relocation.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(8 * 1024 * 1024));     let len = data.len() as u64;    let mut offsets = vec![0, 12.min(len - 1), (len - 1) / 2];    let mut first_eight = [0u8; 8];    first_eight.copy_from_slice(&data[..8]);    offsets.push(u64::from_le_bytes(first_eight) % len);    offsets.sort_unstable();    offsets.dedup();     let mut saw_parseable_entry = false;    for offset in offsets {        let Ok(entry) = file.entry(offset) else {            continue;        };        saw_parseable_entry = true;         let result = catch_unwind(AssertUnwindSafe(|| {            file.decode_entry(                entry,                &mut Vec::new(),                &mut Default::default(),                &|_, _| None,                &mut gix_pack::cache::Never,            )        }));         let outcome = result.expect("malformed delta instruction relocation must not panic");        if outcome.is_err() {            return;        }    }     assert!(        saw_parseable_entry,        "at least one fuzz-selected offset should parse into an entry"    );    panic!("malformed delta instruction relocation should be rejected as corrupt pack data");} /// Reproducer for the runaway delta-chain fuzz case: malformed packs must not be able to grow/// delta bookkeeping without bound before decode eventually fails.#[test]fn runaway_delta_chain_is_reported_without_panicking() {    let data = [        0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0x00, 0x84,        0x00, 0x76, 0x76, 0x76, 0x76, 0x76, 0x76, 0x76, 0x76, 0x76, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1e, 0x91,        0x0e, 0x78, 0x9c, 0x9d, 0xcb, 0x4b, 0x04, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,        0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4f, 0xd0, 0x82, 0x61, 0x15, 0xed, 0x00, 0x01, 0x05, 0x32, 0xe9,        0xea, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x20, 0x36, 0x00, 0x03, 0x29, 0x00, 0x00, 0x01, 0x6c, 0x00,        0xcc, 0x00, 0x00, 0xc1,    ];    let file = data::File::from_data(        data.as_slice(),        PathBuf::from("fuzzed-runaway-delta-chain.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(8 * 1024 * 1024));     let len = data.len() as u64;    let mut offsets = vec![0, 12.min(len - 1), (len - 1) / 2];    let mut first_eight = [0u8; 8];    first_eight.copy_from_slice(&data[..8]);    offsets.push(u64::from_le_bytes(first_eight) % len);    offsets.sort_unstable();    offsets.dedup();     for offset in offsets {        let result = catch_unwind(AssertUnwindSafe(|| match file.entry(offset) {            Ok(entry) => file                .decode_entry(                    entry,                    &mut Vec::new(),                    &mut Default::default(),                    &|_, _| None,                    &mut gix_pack::cache::Never,                )                .map(|_| ())                .map_err(|_| ()),            Err(_) => Err(()),        }));         let outcome = result.expect("runaway delta chains must not panic or OOM the process");        if outcome.is_err() {            return;        }    }     panic!("runaway delta chains should be rejected as corrupt pack data");} /// Reproducer for the overlong delta-header fuzz case: malformed varints in delta headers must be/// rejected as corrupt input instead of overflowing the shift width while decoding sizes.#[test]fn overlong_delta_header_size_is_reported_without_panicking() {    let data = [        0x50, 0x41, 0x43, 0x4b, 0x00, 0x00, 0x00, 0x02, 0x29, 0x00, 0x00, 0x10, 0x68, 0xaf, 0x4f, 0x00, 0x00, 0x00,        0x00, 0x32, 0x18, 0xa1, 0x71, 0x38, 0x95, 0x81, 0x48, 0x58, 0x49, 0x7f, 0x63, 0xe4, 0x4d, 0x6a, 0xe8, 0x85,        0xdb, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xaf, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,        0x80, 0x80, 0x80, 0x80, 0xdf, 0x79, 0x00, 0x17, 0x00, 0x80, 0x80, 0x00, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77,        0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77, 0x77,    ];    let file = data::File::from_data(        data.as_slice(),        PathBuf::from("fuzzed-overlong-delta-header.pack"),        gix_hash::Kind::Sha1,    )    .expect("pack header is syntactically valid")    .with_alloc_limit_bytes(Some(8 * 1024 * 1024));     let len = data.len() as u64;    let mut offsets = vec![0, 12.min(len - 1), (len - 1) / 2];    let mut first_eight = [0u8; 8];    first_eight.copy_from_slice(&data[..8]);    offsets.push(u64::from_le_bytes(first_eight) % len);    offsets.sort_unstable();    offsets.dedup();     let mut saw_parseable_entry = false;    for offset in offsets {        let Ok(entry) = file.entry(offset) else {            continue;        };        saw_parseable_entry = true;         let result = catch_unwind(AssertUnwindSafe(|| {            file.decode_entry(                entry,                &mut Vec::new(),                &mut Default::default(),                &|_, _| None,                &mut gix_pack::cache::Never,            )        }));         let outcome = result.expect("overlong delta header sizes must not panic");        if outcome.is_err() {            return;        }    }     assert!(        saw_parseable_entry,

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