etcher-sdk
Version:
59 lines • 2.35 kB
JavaScript
;
/*
* Copyright 2018 balena.io
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.XzSource = void 0;
const lzma_native_1 = require("lzma-native");
const os_1 = require("os");
const util_1 = require("util");
const compressed_source_1 = require("./compressed-source");
const source_destination_1 = require("./source-destination");
const parseFileIndexAsync = (0, util_1.promisify)(lzma_native_1.parseFileIndex);
class XzSource extends compressed_source_1.CompressedSource {
createTransform() {
return (0, lzma_native_1.createDecompressor)({ memlimit: Math.floor((0, os_1.totalmem)() * 0.2) });
}
async getSize() {
if (!(await this.source.canRead())) {
const sizeFromPartitionTable = await this.getSizeFromPartitionTable();
if (sizeFromPartitionTable !== undefined) {
return { size: sizeFromPartitionTable, isEstimated: true };
}
return;
}
const { size } = await this.source.getMetadata();
if (size === undefined) {
return;
}
const { uncompressedSize } = await parseFileIndexAsync({
fileSize: size,
read: async (count, offset, callback) => {
try {
const readResult = await this.source.read(Buffer.allocUnsafe(count), 0, count, offset);
callback(null, readResult.buffer);
}
catch (error) {
callback(error);
}
},
});
return { size: uncompressedSize, isEstimated: false };
}
}
exports.XzSource = XzSource;
XzSource.mimetype = 'application/x-xz';
source_destination_1.SourceDestination.register(XzSource);
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