174 lines
4.0 KiB
JavaScript
174 lines
4.0 KiB
JavaScript
// field paths that every tar file must have.
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// header is padded to 512 bytes.
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var f = 0
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, fields = {}
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, path = fields.path = f++
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, mode = fields.mode = f++
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, uid = fields.uid = f++
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, gid = fields.gid = f++
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, size = fields.size = f++
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, mtime = fields.mtime = f++
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, cksum = fields.cksum = f++
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, type = fields.type = f++
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, linkpath = fields.linkpath = f++
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, headerSize = 512
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, blockSize = 512
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, fieldSize = []
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fieldSize[path] = 100
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fieldSize[mode] = 8
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fieldSize[uid] = 8
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fieldSize[gid] = 8
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fieldSize[size] = 12
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fieldSize[mtime] = 12
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fieldSize[cksum] = 8
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fieldSize[type] = 1
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fieldSize[linkpath] = 100
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// "ustar\0" may introduce another bunch of headers.
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// these are optional, and will be nulled out if not present.
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var ustar = fields.ustar = f++
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, ustarver = fields.ustarver = f++
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, uname = fields.uname = f++
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, gname = fields.gname = f++
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, devmaj = fields.devmaj = f++
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, devmin = fields.devmin = f++
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, prefix = fields.prefix = f++
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, fill = fields.fill = f++
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// terminate fields.
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fields[f] = null
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fieldSize[ustar] = 6
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fieldSize[ustarver] = 2
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fieldSize[uname] = 32
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fieldSize[gname] = 32
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fieldSize[devmaj] = 8
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fieldSize[devmin] = 8
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fieldSize[prefix] = 155
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fieldSize[fill] = 12
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// nb: prefix field may in fact be 130 bytes of prefix,
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// a null char, 12 bytes for atime, 12 bytes for ctime.
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//
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// To recognize this format:
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// 1. prefix[130] === ' ' or '\0'
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// 2. atime and ctime are octal numeric values
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// 3. atime and ctime have ' ' in their last byte
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var fieldEnds = {}
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, fieldOffs = {}
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, fe = 0
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for (var i = 0; i < f; i ++) {
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fieldOffs[i] = fe
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fieldEnds[i] = (fe += fieldSize[i])
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}
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// build a translation table of field paths.
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Object.keys(fields).forEach(function (f) {
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if (fields[f] !== null) fields[fields[f]] = f
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})
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// different values of the 'type' field
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// paths match the values of Stats.isX() functions, where appropriate
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var types =
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{ 0: "File"
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, "\0": "OldFile" // like 0
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, "": "OldFile"
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, 1: "Link"
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, 2: "SymbolicLink"
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, 3: "CharacterDevice"
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, 4: "BlockDevice"
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, 5: "Directory"
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, 6: "FIFO"
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, 7: "ContiguousFile" // like 0
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// posix headers
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, g: "GlobalExtendedHeader" // k=v for the rest of the archive
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, x: "ExtendedHeader" // k=v for the next file
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// vendor-specific stuff
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, A: "SolarisACL" // skip
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, D: "GNUDumpDir" // like 5, but with data, which should be skipped
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, I: "Inode" // metadata only, skip
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, K: "NextFileHasLongLinkpath" // data = link path of next file
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, L: "NextFileHasLongPath" // data = path of next file
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, M: "ContinuationFile" // skip
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, N: "OldGnuLongPath" // like L
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, S: "SparseFile" // skip
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, V: "TapeVolumeHeader" // skip
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, X: "OldExtendedHeader" // like x
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}
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Object.keys(types).forEach(function (t) {
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types[types[t]] = types[types[t]] || t
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})
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// values for the mode field
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var modes =
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{ suid: 04000 // set uid on extraction
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, sgid: 02000 // set gid on extraction
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, svtx: 01000 // set restricted deletion flag on dirs on extraction
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, uread: 0400
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, uwrite: 0200
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, uexec: 0100
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, gread: 040
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, gwrite: 020
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, gexec: 010
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, oread: 4
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, owrite: 2
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, oexec: 1
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, all: 07777
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}
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var numeric =
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{ mode: true
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, uid: true
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, gid: true
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, size: true
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, mtime: true
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, devmaj: true
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, devmin: true
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, cksum: true
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, atime: true
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, ctime: true
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, dev: true
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, ino: true
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, nlink: true
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}
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Object.keys(modes).forEach(function (t) {
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modes[modes[t]] = modes[modes[t]] || t
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})
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var knownExtended =
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{ atime: true
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, charset: true
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, comment: true
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, ctime: true
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, gid: true
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, gname: true
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, linkpath: true
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, mtime: true
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, path: true
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, realtime: true
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, security: true
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, size: true
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, uid: true
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, uname: true }
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exports.fields = fields
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exports.fieldSize = fieldSize
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exports.fieldOffs = fieldOffs
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exports.fieldEnds = fieldEnds
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exports.types = types
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exports.modes = modes
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exports.numeric = numeric
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exports.headerSize = headerSize
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exports.blockSize = blockSize
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exports.knownExtended = knownExtended
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exports.Pack = require("./lib/pack.js")
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exports.Parse = require("./lib/parse.js")
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exports.Extract = require("./lib/extract.js")
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