I gave this project and quick fuzz and found it panics with following test case

extern crate swf_parser;
#[test]
fn test(){
    let bytes = b"CWSCCCACCGCCC";
    let _ = swf_parser::parsers::movie::parse_movie(&bytes[..]);
}

It causes the following panic:

---- test stdout ----
thread 'test' panicked at 'called Result::unwrap() on an Err value: Custom { kind: Other, error: StringError("unknown ZLIB method CM=0x3") }', src/libcore/result.rs:997:5
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose backtrace.
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
1: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:71
2: std::panicking::default_hook::{{closure}}
at src/libstd/sys_common/backtrace.rs:59
at src/libstd/panicking.rs:197
3: std::panicking::default_hook
at src/libstd/panicking.rs:208
4: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:474
5: std::panicking::continue_panic_fmt
at src/libstd/panicking.rs:381
6: rust_begin_unwind
at src/libstd/panicking.rs:308
7: core::panicking::panic_fmt
at src/libcore/panicking.rs:85
8: core::result::unwrap_failed
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libcore/macros.rs:16
9: <core::result::Result<T, E>>::unwrap
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libcore/result.rs:798
10: swf_parser::parsers::movie::parse_movie
at src/parsers/movie.rs:49
11: test::test
at tests/test.rs:6
12: test::test::{{closure}}
at tests/test.rs:4
13: core::ops::function::FnOnce::call_once
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libcore/ops/function.rs:231
14: <F as alloc::boxed::FnBox>::call_box
at src/libtest/lib.rs:1513
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libcore/ops/function.rs:231
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/liballoc/boxed.rs:749
15: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:87
16: test::run_test::run_test_inner::{{closure}}
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libstd/panicking.rs:272
at /rustc/f22dca0a1bef4141e75326caacc3cd59f3d5be8e/src/libstd/panic.rs:388
at src/libtest/lib.rs:1468