1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
// An Entry consisting of:
//
// "%d %s=%s\n", <length>, <keyword>, <value>
//
// The length is a decimal number, and includes itself and the \n
// \0 does not terminate anything. Only the length terminates the string.
// Numeric values are decimal strings.
module.exports = ExtendedHeader
var Entry = require("./entry.js")
, inherits = require("inherits")
, tar = require("../tar.js")
, numeric = tar.numeric
, keyTrans = { "SCHILY.dev": "dev"
, "SCHILY.ino": "ino"
, "SCHILY.nlink": "nlink" }
function ExtendedHeader () {
Entry.apply(this, arguments)
this.on("data", this._parse)
this.fields = {}
this._position = 0
this._fieldPos = 0
this._state = SIZE
this._sizeBuf = []
this._keyBuf = []
this._valBuf = []
this._size = -1
this._key = ""
}
inherits(ExtendedHeader, Entry)
ExtendedHeader.prototype._parse = parse
var s = 0
, states = ExtendedHeader.states = {}
, SIZE = states.SIZE = s++
, KEY = states.KEY = s++
, VAL = states.VAL = s++
, ERR = states.ERR = s++
Object.keys(states).forEach(function (s) {
states[states[s]] = states[s]
})
states[s] = null
// char code values for comparison
var _0 = "0".charCodeAt(0)
, _9 = "9".charCodeAt(0)
, point = ".".charCodeAt(0)
, a = "a".charCodeAt(0)
, Z = "Z".charCodeAt(0)
, a = "a".charCodeAt(0)
, z = "z".charCodeAt(0)
, space = " ".charCodeAt(0)
, eq = "=".charCodeAt(0)
, cr = "\n".charCodeAt(0)
function parse (c) {
if (this._state === ERR) return
for ( var i = 0, l = c.length
; i < l
; this._position++, this._fieldPos++, i++) {
// console.error("top of loop, size="+this._size)
var b = c[i]
if (this._size >= 0 && this._fieldPos > this._size) {
error(this, "field exceeds length="+this._size)
return
}
switch (this._state) {
case ERR: return
case SIZE:
// console.error("parsing size, b=%d, rest=%j", b, c.slice(i).toString())
if (b === space) {
this._state = KEY
// this._fieldPos = this._sizeBuf.length
this._size = parseInt(new Buffer(this._sizeBuf).toString(), 10)
this._sizeBuf.length = 0
continue
}
if (b < _0 || b > _9) {
error(this, "expected [" + _0 + ".." + _9 + "], got " + b)
return
}
this._sizeBuf.push(b)
continue
case KEY:
// can be any char except =, not > size.
if (b === eq) {
this._state = VAL
this._key = new Buffer(this._keyBuf).toString()
if (keyTrans[this._key]) this._key = keyTrans[this._key]
this._keyBuf.length = 0
continue
}
this._keyBuf.push(b)
continue
case VAL:
// field must end with cr
if (this._fieldPos === this._size - 1) {
// console.error("finished with "+this._key)
if (b !== cr) {
error(this, "expected \\n at end of field")
return
}
var val = new Buffer(this._valBuf).toString()
if (numeric[this._key]) {
val = parseFloat(val)
}
this.fields[this._key] = val
this._valBuf.length = 0
this._state = SIZE
this._size = -1
this._fieldPos = -1
continue
}
this._valBuf.push(b)
continue
}
}
}
function error (me, msg) {
msg = "invalid header: " + msg
+ "\nposition=" + me._position
+ "\nfield position=" + me._fieldPos
me.error(msg)
me.state = ERR
}
|
