aaac7fed
 liuqimichale
add
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module.exports = ExtendedHeaderWriter
var inherits = require("inherits")
, EntryWriter = require("./entry-writer.js")
inherits(ExtendedHeaderWriter, EntryWriter)
var tar = require("../tar.js")
, path = require("path")
, TarHeader = require("./header.js")
// props is the props of the thing we need to write an
// extended header for.
// Don't be shy with it. Just encode everything.
function ExtendedHeaderWriter (props) {
// console.error(">> ehw ctor")
var me = this
if (!(me instanceof ExtendedHeaderWriter)) {
return new ExtendedHeaderWriter(props)
}
me.fields = props
var p =
{ path : ("PaxHeader" + path.join("/", props.path || ""))
.replace(/\\/g, "/").substr(0, 100)
, mode : props.mode || 0666
, uid : props.uid || 0
, gid : props.gid || 0
, size : 0 // will be set later
, mtime : props.mtime || Date.now() / 1000
, type : "x"
, linkpath : ""
, ustar : "ustar\0"
, ustarver : "00"
, uname : props.uname || ""
, gname : props.gname || ""
, devmaj : props.devmaj || 0
, devmin : props.devmin || 0
}
EntryWriter.call(me, p)
// console.error(">> ehw props", me.props)
me.props = p
me._meta = true
}
ExtendedHeaderWriter.prototype.end = function () {
// console.error(">> ehw end")
var me = this
if (me._ended) return
me._ended = true
me._encodeFields()
if (me.props.size === 0) {
// nothing to write!
me._ready = true
me._stream.end()
return
}
me._stream.write(TarHeader.encode(me.props))
me.body.forEach(function (l) {
me._stream.write(l)
})
me._ready = true
// console.error(">> ehw _process calling end()", me.props)
this._stream.end()
}
ExtendedHeaderWriter.prototype._encodeFields = function () {
// console.error(">> ehw _encodeFields")
this.body = []
if (this.fields.prefix) {
this.fields.path = this.fields.prefix + "/" + this.fields.path
this.fields.prefix = ""
}
encodeFields(this.fields, "", this.body, this.fields.noProprietary)
var me = this
this.body.forEach(function (l) {
me.props.size += l.length
})
}
function encodeFields (fields, prefix, body, nop) {
// console.error(">> >> ehw encodeFields")
// "%d %s=%s\n", <length>, <keyword>, <value>
// The length is a decimal number, and includes itself and the \n
// Numeric values are decimal strings.
Object.keys(fields).forEach(function (k) {
var val = fields[k]
, numeric = tar.numeric[k]
if (prefix) k = prefix + "." + k
// already including NODETAR.type, don't need File=true also
if (k === fields.type && val === true) return
switch (k) {
// don't include anything that's always handled just fine
// in the normal header, or only meaningful in the context
// of nodetar
case "mode":
case "cksum":
case "ustar":
case "ustarver":
case "prefix":
case "basename":
case "dirname":
case "needExtended":
case "block":
case "filter":
return
case "rdev":
if (val === 0) return
break
case "nlink":
case "dev": // Truly a hero among men, Creator of Star!
case "ino": // Speak his name with reverent awe! It is:
k = "SCHILY." + k
break
default: break
}
if (val && typeof val === "object" &&
!Buffer.isBuffer(val)) encodeFields(val, k, body, nop)
else if (val === null || val === undefined) return
else body.push.apply(body, encodeField(k, val, nop))
})
return body
}
function encodeField (k, v, nop) {
// lowercase keys must be valid, otherwise prefix with
// "NODETAR."
if (k.charAt(0) === k.charAt(0).toLowerCase()) {
var m = k.split(".")[0]
if (!tar.knownExtended[m]) k = "NODETAR." + k
}
// no proprietary
if (nop && k.charAt(0) !== k.charAt(0).toLowerCase()) {
return []
}
if (typeof val === "number") val = val.toString(10)
var s = new Buffer(" " + k + "=" + v + "\n")
, digits = Math.floor(Math.log(s.length) / Math.log(10)) + 1
// console.error("1 s=%j digits=%j s.length=%d", s.toString(), digits, s.length)
// if adding that many digits will make it go over that length,
// then add one to it. For example, if the string is:
// " foo=bar\n"
// then that's 9 characters. With the "9", that bumps the length
// up to 10. However, this is invalid:
// "10 foo=bar\n"
// but, since that's actually 11 characters, since 10 adds another
// character to the length, and the length includes the number
// itself. In that case, just bump it up again.
if (s.length + digits >= Math.pow(10, digits)) digits += 1
// console.error("2 s=%j digits=%j s.length=%d", s.toString(), digits, s.length)
var len = digits + s.length
// console.error("3 s=%j digits=%j s.length=%d len=%d", s.toString(), digits, s.length, len)
var lenBuf = new Buffer("" + len)
if (lenBuf.length + s.length !== len) {
throw new Error("Bad length calculation\n"+
"len="+len+"\n"+
"lenBuf="+JSON.stringify(lenBuf.toString())+"\n"+
"lenBuf.length="+lenBuf.length+"\n"+
"digits="+digits+"\n"+
"s="+JSON.stringify(s.toString())+"\n"+
"s.length="+s.length)
}
return [lenBuf, s]
}
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