45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
// Copyright 2015 Matthew Collins
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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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pub struct Array {
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pub data: Vec<u8>,
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}
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impl Array {
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pub fn new(size: usize) -> Array {
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Array {
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data: vec![0; (size + 1) >> 1],
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}
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}
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pub fn get(&self, idx: usize) -> u8 {
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let val = self.data[idx >> 1];
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if idx & 1 == 0 {
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val & 0xF
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} else {
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val >> 4
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}
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}
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pub fn set(&mut self, idx: usize, val: u8) {
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let i = idx >> 1;
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let old = self.data[i];
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if idx & 1 == 0 {
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self.data[i] = (old & 0xF0) | (val & 0xF);
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} else {
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self.data[i] = (old & 0x0F) | ((val & 0xF) << 4);
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}
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}
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}
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