@vbyte/btc-dev/dist/lib/script/decode.js

Batteries-included toolset for plebian bitcoin development

import { Buff, Stream } from '@vbyte/buff';
import { get_op_code, get_op_type, is_valid_op } from './words.js';
export function parse_script(script) {
    const bytes = Buff.bytes(script);
    return {
        asm: decode_script(bytes),
        hex: bytes.hex
    };
}
export function decode_script(script) {
    const stream = new Stream(script);
    const stack = [];
    const stack_size = stream.size;
    let word;
    let word_type;
    let word_size;
    let count = 0;
    while (count < stack_size) {
        word = stream.read(1).num;
        word_type = get_op_type(word);
        count++;
        switch (word_type) {
            case 'varint':
                stack.push(stream.read(word).hex);
                count += word;
                break;
            case 'pushdata1':
                word_size = stream.read(1).reverse().num;
                stack.push(stream.read(word_size).hex);
                count += word_size + 1;
                break;
            case 'pushdata2':
                word_size = stream.read(2).reverse().num;
                stack.push(stream.read(word_size).hex);
                count += word_size + 2;
                break;
            case 'pushdata4':
                word_size = stream.read(4).reverse().num;
                stack.push(stream.read(word_size).hex);
                count += word_size + 4;
                break;
            case 'opcode':
                if (!is_valid_op(word)) {
                    throw new Error(`Invalid OPCODE: ${word}`);
                }
                stack.push(get_op_code(word));
                break;
            default:
                throw new Error(`Word type undefined: ${word}`);
        }
    }
    return stack;
}
export function is_valid_script(script) {
    try {
        const stack = decode_script(script);
        return stack.length > 0;
    }
    catch {
        return false;
    }
}