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std/_wasm_varint/src/lib.rs

Deno standard library
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.use wasm_bindgen::prelude::*;
#[wasm_bindgen]pub fn encode_u32(val: u32) -> Vec<u8> {  encode_u64(val as u64)}
#[wasm_bindgen]pub fn encode_u64(mut val: u64) -> Vec<u8> {  let mut buff = Vec::with_capacity(10);  loop {    // If MSB == 0    if (val & !0x7F) == 0 {      buff.push(val as u8);      break;    }    buff.push((val & 0x7F | 0x80) as u8);    val >>= 7;  }
  buff}
#[wasm_bindgen]pub fn decode_u32(buff: Vec<u8>) -> u32 {  decode_u64(buff) as u32}
#[wasm_bindgen]pub fn decode_u64(buff: Vec<u8>) -> u64 {  let mut value: u64 = 0;  let mut length = 0;  loop {    let byte = buff[length] as u64;    value |= (byte & 0x7F) << (7 * length);    length += 1;
    if byte & 0x80 != 0x80 {      break;    }  }
  value}