8a53986961
* adds extract_* functions to CBOR library * hides Value implementation details * CBOR API fixes * README adapted to API changes
88 lines
2.9 KiB
Rust
88 lines
2.9 KiB
Rust
// Copyright 2021 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////////
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//! Example program demonstrating cbor usage.
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extern crate alloc;
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use sk_cbor::values::Value;
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use sk_cbor::{cbor_array, cbor_bytes, cbor_map, cbor_null, cbor_true};
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fn hexify(data: &[u8]) -> String {
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let mut s = String::new();
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for b in data {
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s.push_str(&format!("{:02x}", b));
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}
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s
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}
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fn main() {
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// Build a CBOR object with various different types included. Note that this
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// object is not built in canonical order.
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let manual_object = Value::map(vec![
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(
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Value::from(1),
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Value::array(vec![Value::from(2), Value::from(3)]),
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),
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(Value::from("tstr".to_owned()), Value::from(vec![1, 2, 3])),
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(Value::from(-2), Value::null_value()),
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(Value::from(3), Value::bool_value(true)),
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]);
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// Build the same object using the crate's convenience macros.
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let macro_object = cbor_map! {
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1 => cbor_array![2, 3],
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"tstr" => cbor_bytes!(vec![1, 2, 3]),
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-2 => cbor_null!(),
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3 => cbor_true!(),
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};
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assert_eq!(manual_object, macro_object);
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println!("Object {:?}", manual_object);
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// Serialize to bytes.
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let mut manual_data = vec![];
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sk_cbor::writer::write(manual_object, &mut manual_data).unwrap();
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let hex_manual_data = hexify(&manual_data);
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let mut macro_data = vec![];
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sk_cbor::writer::write(macro_object, &mut macro_data).unwrap();
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let hex_macro_data = hexify(¯o_data);
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assert_eq!(hex_manual_data, hex_macro_data);
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// Serialized version is in canonical order.
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println!("Serializes to {}", hex_manual_data);
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assert_eq!(
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hex_manual_data,
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concat!(
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"a4", // 4-map
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"01", // int(1) =>
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"820203", // 2-array [2, 3],
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"03", // int(3) =>
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"f5", // true,
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"21", // nint(-2) =>
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"f6", // null,
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"6474737472", // 4-tstr "tstr" =>
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"43010203" // 3-bstr
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)
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);
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// Convert back to an object. This is different than the original object,
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// because the map is now in canonical order.
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let recovered_object = sk_cbor::reader::read(&manual_data).unwrap();
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println!("Deserializes to {:?}", recovered_object);
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}
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