Craig Condon
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
// field names that every tar file must have.
|
|
// header is padded to 512 bytes.
|
|
var f = 0
|
|
, fields = {}
|
|
, NAME = fields.NAME = f++
|
|
, MODE = fields.MODE = f++
|
|
, UID = fields.UID = f++
|
|
, GID = fields.GID = f++
|
|
, SIZE = fields.SIZE = f++
|
|
, MTIME = fields.MTIME = f++
|
|
, CKSUM = fields.CKSUM = f++
|
|
, TYPE = fields.TYPE = f++
|
|
, LINKNAME = fields.LINKNAME = f++
|
|
, headerSize = 512
|
|
, fieldSize = []
|
|
|
|
fieldSize[NAME] = 100
|
|
fieldSize[MODE] = 8
|
|
fieldSize[UID] = 8
|
|
fieldSize[GID] = 8
|
|
fieldSize[SIZE] = 12
|
|
fieldSize[MTIME] = 12
|
|
fieldSize[CKSUM] = 8
|
|
fieldSize[TYPE] = 1
|
|
fieldSize[LINKNAME] = 100
|
|
|
|
// "ustar\0" may introduce another bunch of headers.
|
|
// these are optional, and will be nulled out if not present.
|
|
var ustar = new Buffer(6)
|
|
ustar.asciiWrite("ustar\0")
|
|
|
|
var USTAR = fields.USTAR = f++
|
|
, USTARVER = fields.USTARVER = f++
|
|
, UNAME = fields.UNAME = f++
|
|
, GNAME = fields.GNAME = f++
|
|
, DEVMAJ = fields.DEVMAJ = f++
|
|
, DEVMIN = fields.DEVMIN = f++
|
|
, PREFIX = fields.PREFIX = f++
|
|
// terminate fields.
|
|
fields[f] = null
|
|
|
|
fieldSize[USTAR] = 6
|
|
fieldSize[USTARVER] = 2
|
|
fieldSize[UNAME] = 32
|
|
fieldSize[GNAME] = 32
|
|
fieldSize[DEVMAJ] = 8
|
|
fieldSize[DEVMIN] = 8
|
|
fieldSize[PREFIX] = 155
|
|
|
|
var fieldEnds = {}
|
|
, fieldOffs = {}
|
|
, fe = 0
|
|
for (var i = 0; i < f; i ++) {
|
|
fieldOffs[i] = fe
|
|
fieldEnds[i] = (fe += fieldSize[i])
|
|
}
|
|
|
|
// build a translation table of field names.
|
|
Object.keys(fields).forEach(function (f) {
|
|
fields[fields[f]] = f
|
|
})
|
|
|
|
exports.ustar = ustar
|
|
exports.fields = fields
|
|
exports.fieldSize = fieldSize
|
|
exports.fieldOffs = fieldOffs
|
|
exports.fieldEnds = fieldEnds
|
|
exports.headerSize = headerSize
|
|
|
|
var Parser = exports.Parser = require("./parser")
|
|
exports.createParser = Parser.create
|
|
|
|
var Generator = exports.Generator = require("./generator")
|
|
exports.createGenerator = Generator.create
|