molstar
Version:
A comprehensive macromolecular library.
43 lines (42 loc) • 1.67 kB
JavaScript
;
/**
* Copyright (c) 2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author David Sehnal <david.sehnal@gmail.com>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.getG3dHeader = getG3dHeader;
exports.getG3dDataBlock = getG3dDataBlock;
const decode_1 = require("../../mol-io/common/msgpack/decode");
const mol_task_1 = require("../../mol-task");
const zip_1 = require("../../mol-util/zip/zip");
const HEADER_SIZE = 64000;
async function getG3dHeader(ctx, urlOrData) {
const data = await getRawData(ctx, urlOrData, { offset: 0, size: HEADER_SIZE });
let last = data.length - 1;
for (; last >= 0; last--) {
if (data[last] !== 0)
break;
}
const header = (0, decode_1.decodeMsgPack)(data.slice(0, last + 1));
return header;
}
async function getG3dDataBlock(ctx, header, urlOrData, resolution) {
if (!header.offsets[resolution])
throw new Error(`Resolution ${resolution} not available.`);
const data = await getRawData(ctx, urlOrData, header.offsets[resolution]);
const unzipped = await ctx.runTask(mol_task_1.Task.create('Unzip', ctx => (0, zip_1.inflate)(ctx, data)));
return {
header,
resolution,
data: (0, decode_1.decodeMsgPack)(unzipped)
};
}
async function getRawData(ctx, urlOrData, range) {
if (typeof urlOrData === 'string') {
return await ctx.runTask(ctx.fetch({ url: urlOrData, headers: [['Range', `bytes=${range.offset}-${range.offset + range.size - 1}`]], type: 'binary' }));
}
else {
return urlOrData.slice(range.offset, range.offset + range.size);
}
}