118 lines
2.5 KiB
JavaScript
118 lines
2.5 KiB
JavaScript
(function () {
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"use strict";
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var recordSize = 512;
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function removePadding(buf) {
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var text = '',
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i, length;
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for (i = 0, length = buf.length; i < buf.length; i += 1) {
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text += String.fromCharCode(buf[i]);
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}
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return parseInt(text.replace(/^0*/, ''), 8) || 0;
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}
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function readString(buf) {
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var text = '',
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i, length;
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for (i = 0, length = buf.length; i < length, buf[i] !== 0; i += 1) {
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text += String.fromCharCode(buf[i]);
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}
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return text;
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}
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function doHeader(buf) {
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var data = {}, offset = 0;
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data.fileName = readString(buf.subarray(offset, offset + 100));
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offset += 100;
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data.fileMode = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.uid = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.gid = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.fileSize = removePadding(buf.subarray(offset, offset + 12));
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offset += 12;
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data.mtime = removePadding(buf.subarray(offset, offset + 12));
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offset += 12;
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data.checksum = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.type = removePadding(buf.subarray(offset, offset + 1));
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offset += 1;
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data.linkname = readString(buf.subarray(offset, offset + 100));
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offset += 100;
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data.ustar = readString(buf.subarray(offset, offset + 8));
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if (/ustar/.test(data.ustar)) {
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offset += 8;
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data.owner = readString(buf.subarray(offset, offset + 32));
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offset += 32;
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data.group = readString(buf.subarray(offset, offset + 32));
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offset += 32;
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data.majorNumber = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.minorNumber = removePadding(buf.subarray(offset, offset + 8));
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offset += 8;
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data.filenamePrefix = readString(buf.subarray(offset, offset + 155));
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}
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return data;
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}
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function doFile(buf, cb) {
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var header, offset = 0, numBlocks, fileData;
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header = doHeader(buf);
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offset += recordSize;
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numBlocks = Math.ceil(header.fileSize / recordSize);
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fileData = buf.subarray(offset, offset + header.fileSize);
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offset += numBlocks * recordSize;
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cb(header, fileData, offset);
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}
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/*
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* Extract data from an input.
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*
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* @param input- must be a buffer
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* @param opts- object of options
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* @param cb- callback to call on each file- params: header, fileData (uint8Array)
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*/
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function Untar (input, cb) {
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var offset = 0;
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while(input[offset]) {
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doFile(input.subarray(offset), function (header, fileData, iOffset) {
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offset += iOffset;
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cb(header, fileData);
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});
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}
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}
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module.exports = Untar;
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provide('untar', module.exports);
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}());
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