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const {Number:NumberT} = require('./Number');
exports.resolveLength = function(length, stream, parent) {
let res;
if (typeof length === 'number') {
res = length;
} else if (typeof length === 'function') {
res = length.call(parent, parent);
} else if (parent && (typeof length === 'string')) {
res = parent[length];
} else if (stream && length instanceof NumberT) {
res = length.decode(stream);
}
if (isNaN(res)) {
throw new Error('Not a fixed size');
}
return res;
};
class PropertyDescriptor {
constructor(opts = {}) {
this.enumerable = true;
this.configurable = true;
for (let key in opts) {
const val = opts[key];
this[key] = val;
}
}
}
exports.PropertyDescriptor = PropertyDescriptor;