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import {type FileInit} from "./core.d.ts";import {cryptoHash} from "./crypto.ts";import {ucEncode, ucDecode, hexEncode} from "./text.ts";
const sizeHash = 32;const sizeName = 1;const sizeBody = 4;
/*** Encode data into a byte array in "minipack" format.* @param files array of pair of name and byte array.* @return byte array in "minipack" format.* @see https://deno.land/x/simple_utility*/export async function minipackEncode(files:FileInit[]){    const archive = new Uint8Array(files.reduce((a, [k, v]) => a + sizeHash + sizeName + sizeBody + ucEncode(k).byteLength + v.byteLength, 0));
    let offset = 0;
    for(const [k, v] of files){        const name = ucEncode(k);        const body = v;
        archive.set(await cryptoHash(false, body), offset);        offset += sizeHash;
        new DataView(archive.buffer, offset).setUint8(0, name.byteLength);        offset += sizeName;
        new DataView(archive.buffer, offset).setUint32(0, body.byteLength);        offset += sizeBody;
        archive.set(name, offset);        offset += name.byteLength;
        archive.set(body, offset);        offset += body.byteLength;    }
    return archive;}
/*** Decode byte array in "minipack" format.* @param archive byte array in "minipack" format.* @return array of pair of name and byte array.* @see https://deno.land/x/simple_utility*/export async function minipackDecode(archive:Uint8Array){    const files:FileInit[] = [];
    let offset = 0;
    while(offset < archive.byteLength){        const hash = archive.subarray(offset, offset += sizeHash);
        const ns = new DataView(archive.buffer, offset).getUint8(0);        offset += sizeName;
        const bs = new DataView(archive.buffer, offset).getUint32(0);        offset += sizeBody;
        const name = ucDecode(archive.subarray(offset, offset += ns));
        const body = archive.subarray(offset, offset += bs);
        if(hexEncode(hash) !== hexEncode(await cryptoHash(false, body))){            throw new Error();        }
        files.push([name, body]);    }
    return files;}