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Implement the Tar operation

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toby 2017-02-08 23:35:54 -05:00
parent 281a83bbc3
commit 442dd560c0
1 changed files with 108 additions and 2 deletions
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110
src/js/operations/Compress.js
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@ -364,8 +364,114 @@ var Compress = {
* @returns {byteArray}
*/
runTar: function(input, args) {
// Not implemented yet
return input;
var zeroFillBytes = function(string, bytes) {
var paddedString = new Array(bytes);
paddedString.fill(0);
string = string.toString().slice(0, bytes);
Array.prototype.map.call(string, function(chr, i) {
paddedString[i] = chr;
});
return paddedString;
};
var padLeft = function(string, length, padChar) {
while(string.length < length) {
string = padChar + string;
}
return string;
};
var Tarball = function() {
this.bytes = new Array(512);
this.position = 0;
};
Tarball.prototype.writeBytes = function(bytes) {
var self = this;
if(this.bytes.length - this.position < 512) {
var filler = new Array(512);
filler.fill(0);
this.bytes = this.bytes.concat(filler);
}
Array.prototype.forEach.call(bytes, function(b, i) {
if(typeof b.charCodeAt !== "undefined") {
b = b.charCodeAt();
}
self.bytes[self.position] = b;
self.position += 1;
});
};
Tarball.prototype.writeEndBlocks = function() {
var filler = new Array(512 * 1);
filler.fill(0);
this.writeBytes(filler);
};
var fileSize = padLeft(input.length.toString(8), 11, "0");
var currentUnixTimestamp = Math.floor(Date.now() / 1000);
var lastModTime = padLeft(currentUnixTimestamp.toString(8), 11, "0");
var file = {
fileName: zeroFillBytes(args[0], 100),
fileMode: zeroFillBytes("0000664", 8),
ownerUID: zeroFillBytes("0", 8),
ownerGID: zeroFillBytes("0", 8),
size: zeroFillBytes(fileSize, 12),
lastModTime: zeroFillBytes(lastModTime, 12),
checksum: " ",
type: "0",
linkedFileName: zeroFillBytes("", 100),
USTARFormat: zeroFillBytes("ustar", 6),
version: "00",
ownerUserName: zeroFillBytes("", 32),
ownerGroupName: zeroFillBytes("", 32),
deviceMajor: zeroFillBytes("", 8),
deviceMinor: zeroFillBytes("", 8),
fileNamePrefix: zeroFillBytes("", 155),
};
var checksum = 0;
for(var key in file) {
var bytes = file[key];
Array.prototype.forEach.call(bytes, function(b) {
if(typeof b.charCodeAt !== "undefined") {
checksum += b.charCodeAt();
} else {
checksum += b;
}
});
}
checksum = zeroFillBytes(padLeft(checksum.toString(8), 7, "0"), 8);
file.checksum = checksum;
var tarball = new Tarball();
tarball.writeBytes(file.fileName);
tarball.writeBytes(file.fileMode);
tarball.writeBytes(file.ownerUID);
tarball.writeBytes(file.ownerGID);
tarball.writeBytes(file.size);
tarball.writeBytes(file.lastModTime);
tarball.writeBytes(file.checksum);
tarball.writeBytes(file.type);
tarball.writeBytes(file.linkedFileName);
tarball.writeBytes(file.USTARFormat);
tarball.writeBytes(file.version);
tarball.writeBytes(file.ownerUserName);
tarball.writeBytes(file.ownerGroupName);
tarball.writeBytes(file.deviceMajor);
tarball.writeBytes(file.deviceMinor);
tarball.writeBytes(file.fileNamePrefix);
tarball.writeBytes(zeroFillBytes("", 12));
tarball.writeBytes(input);
tarball.writeEndBlocks();
return tarball.bytes;
},