Panic on invalid input to pdf::file::FileOptions::load

[MinghuaWang]

Describe the bug

Panic could be triggered when passing pdf::file::FileOptions::load with invalid input. Panic info is shown below:
thread 'main' panicked at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/primitive.rs:767:33:
byte index 2 is not a char boundary; it is inside 'ߧ' (bytes 1..3) of <ߧ0101213085485+01*01'* /GgaBcqf'A<40110612185925+01'01'

Full stack backtrace:

   0: rust_begin_unwind
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/std/src/panicking.rs:617:5
   1: core::panicking::panic_fmt
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/core/src/panicking.rs:67:14
   2: core::str::slice_error_fail_rt
   3: core::str::slice_error_fail
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/core/src/str/mod.rs:87:9
   4: core::str::traits::<impl core::slice::index::SliceIndex<str> for core::ops::range::Range<usize>>::index
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/core/src/str/traits.rs:235:21
   5: core::str::traits::<impl core::ops::index::Index<I> for str>::index
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/core/src/str/traits.rs:61:9
   6: <pdf::primitive::Date as pdf::object::Object>::from_primitive
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/primitive.rs:767:33
   7: <core::option::Option<T> as pdf::object::Object>::from_primitive
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/object/mod.rs:656:24
   8: <pdf::object::types::InfoDict as pdf::object::FromDict>::from_dict
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/object/types.rs:1551:10
   9: <pdf::object::types::InfoDict as pdf::object::Object>::from_primitive
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/object/types.rs:1551:10
  10: <core::option::Option<T> as pdf::object::Object>::from_primitive
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/object/mod.rs:656:24
  11: <pdf::file::Trailer as pdf::object::FromDict>::from_dict
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/file.rs:626:10
  12: <pdf::file::Trailer as pdf::object::Object>::from_primitive
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/file.rs:626:10
  13: pdf::file::File<B,OC,SC,L>::load_data
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/file.rs:579:26
  14: pdf::file::FileOptions<OC,SC,L>::load
             at /DATA2/dev/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/pdf-0.9.0/src/file.rs:562:9
  15: pdf_poc::main
             at ./src/main.rs:4:21
  16: core::ops::function::FnOnce::call_once
             at /rustc/07688726805d5db0a4bca445a6651d09708041ea/library/core/src/ops/function.rs:250:5

Expected behavior

Not panic. It could be an error reported to the users.

Test environment:

Version: pdf = "0.9.0"
OS: Ubuntu 20.04, 64 bit
Target triple: x86_64-unknown-linux-gnu
Rustc version: rustc 1.73.0-nightly (076887268 2023-08-17)

To Reproduce

It can be reproduced with the following program:

fn main() {
    let p = "crash.pdf";
    if let Ok(data) = std::fs::read(p) {
        if let Ok(file) = pdf::file::FileOptions::cached().load(data.as_slice()) {
            for idx in 0..file.num_pages() {
                let _ = file.get_page(idx);
            }
        }
    }
}

crash.pdf is attached:
crash.pdf.zip