c2pa 0.80.0

Rust SDK for C2PA (Coalition for Content Provenance and Authenticity) implementors
Documentation 
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// Copyright 2022 Adobe. All rights reserved.
// This file is licensed to you under the Apache License,
// Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
// or the MIT license (http://opensource.org/licenses/MIT),
// at your option.

// Unless required by applicable law or agreed to in writing,
// this software is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR REPRESENTATIONS OF ANY KIND, either express or
// implied. See the LICENSE-MIT and LICENSE-APACHE files for the
// specific language governing permissions and limitations under
// each license.

pub(crate) mod cbor_types;

mod debug_byte_slice;
pub(crate) use debug_byte_slice::DebugByteSlice;

mod ephemeral_cert;
pub mod ephemeral_signer;

#[allow(dead_code)]
pub(crate) mod hash_utils;
pub(crate) mod io_utils;
pub(crate) mod merkle;
pub(crate) mod mime;
#[allow(dead_code)] // for wasm build
pub(crate) mod patch;
#[cfg(feature = "add_thumbnails")]
pub(crate) mod thumbnail;
pub(crate) mod time_it;
#[allow(dead_code)] // for wasm builds
pub(crate) mod xmp_inmemory_utils;
// shared unit testing utilities
#[cfg(test)]
#[allow(dead_code)] // for wasm build
pub mod test;
#[cfg(test)]
pub(crate) mod test_signer;

// fast 0 vector test using byte alignment to perform faster native byte align comparison
pub(crate) fn is_zero(bytes: &[u8]) -> bool {
    if bytes.is_empty() {
        return true;
    }

    unsafe {
        let (prefix, aligned, suffix) = bytes.align_to::<u64>();
        prefix.iter().all(|&x| x == 0)
            && aligned.iter().all(|&x| x == 0u64)
            && suffix.iter().all(|&x| x == 0u8)
    }
}