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/*
* @licstart The following is the entire license notice for the
* JavaScript code in this page.
*
* Copyright (C) 2025 Runxi Yu
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @licend The above is the entire license notice
* for the JavaScript code in this page.
*/
let wasm_instance = null;
let wasm_exports = null;
async function load_wasm() {
let response = await fetch("/.powxy/wasm/solver.wasm");
let { instance } = await WebAssembly.instantiateStreaming(response, {
env: {
memory: new WebAssembly.Memory({ initial: 1 })
}
});
wasm_instance = instance;
wasm_exports = instance.exports;
}
onmessage = async function(e) {
let { identifier_bytes, difficulty } = e.data;
if (!wasm_instance) {
await load_wasm();
}
let ptr = wasm_exports.get_challenge_ptr();
let memory = new Uint8Array(wasm_instance.exports.memory.buffer, ptr, 32);
memory.set(identifier_bytes);
let nonce = wasm_exports.solve(difficulty);
let buf = new ArrayBuffer(8);
let view = new DataView(buf);
view.setBigUint64(0, BigInt(nonce), true);
let nonce_bytes = new Uint8Array(buf);
postMessage({ nonce, nonce_bytes });
};
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