molstar
Version:
A comprehensive macromolecular library.
57 lines (56 loc) • 1.95 kB
JavaScript
"use strict";
/**
* Copyright (c) 2018 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* Taken/adapted from DensityServer (https://github.com/dsehnal/DensityServer)
*
* @author David Sehnal <david.sehnal@gmail.com>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.encodeHeader = encodeHeader;
exports.readHeader = readHeader;
const tslib_1 = require("tslib");
const Schema = tslib_1.__importStar(require("./binary-schema"));
var _schema;
(function (_schema) {
const { array, obj, int, bool, float, str } = Schema;
_schema.schema = obj([
['formatVersion', str],
['axisOrder', array(int)],
['origin', array(float)],
['dimensions', array(float)],
['spacegroup', obj([
['number', int],
['size', array(float)],
['angles', array(float)],
['isPeriodic', bool],
])],
['channels', array(str)],
['valueType', str],
['blockSize', int],
['sampling', array(obj([
['byteOffset', float],
['rate', int],
['valuesInfo', array(obj([
['mean', float],
['sigma', float],
['min', float],
['max', float]
]))],
['sampleCount', array(int)]
]))]
]);
})(_schema || (_schema = {}));
const headerSchema = _schema.schema;
function encodeHeader(header) {
return Schema.encode(headerSchema, header);
}
async function readHeader(file) {
let { buffer } = await file.readBuffer(0, 4 * 4096);
const headerSize = buffer.readInt32LE(0);
if (headerSize > buffer.byteLength - 4) {
buffer = (await file.readBuffer(0, headerSize + 4)).buffer;
}
const header = Schema.decode(headerSchema, buffer, 4);
return { header, dataOffset: headerSize + 4 };
}