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
|
"use strict";
var Buffer = require("buffer").Buffer,
Transform = require("stream").Transform;
// == Exports ==================================================================
module.exports = function(iconv) {
// Additional Public API.
iconv.encodeStream = function encodeStream(encoding, options) {
return new IconvLiteEncoderStream(iconv.getEncoder(encoding, options), options);
}
iconv.decodeStream = function decodeStream(encoding, options) {
return new IconvLiteDecoderStream(iconv.getDecoder(encoding, options), options);
}
iconv.supportsStreams = true;
// Not published yet.
iconv.IconvLiteEncoderStream = IconvLiteEncoderStream;
iconv.IconvLiteDecoderStream = IconvLiteDecoderStream;
iconv._collect = IconvLiteDecoderStream.prototype.collect;
};
// == Encoder stream =======================================================
function IconvLiteEncoderStream(conv, options) {
this.conv = conv;
options = options || {};
options.decodeStrings = false; // We accept only strings, so we don't need to decode them.
Transform.call(this, options);
}
IconvLiteEncoderStream.prototype = Object.create(Transform.prototype, {
constructor: { value: IconvLiteEncoderStream }
});
IconvLiteEncoderStream.prototype._transform = function(chunk, encoding, done) {
if (typeof chunk != 'string')
return done(new Error("Iconv encoding stream needs strings as its input."));
try {
var res = this.conv.write(chunk);
if (res && res.length) this.push(res);
done();
}
catch (e) {
done(e);
}
}
IconvLiteEncoderStream.prototype._flush = function(done) {
try {
var res = this.conv.end();
if (res && res.length) this.push(res);
done();
}
catch (e) {
done(e);
}
}
IconvLiteEncoderStream.prototype.collect = function(cb) {
var chunks = [];
this.on('error', cb);
this.on('data', function(chunk) { chunks.push(chunk); });
this.on('end', function() {
cb(null, Buffer.concat(chunks));
});
return this;
}
// == Decoder stream =======================================================
function IconvLiteDecoderStream(conv, options) {
this.conv = conv;
options = options || {};
options.encoding = this.encoding = 'utf8'; // We output strings.
Transform.call(this, options);
}
IconvLiteDecoderStream.prototype = Object.create(Transform.prototype, {
constructor: { value: IconvLiteDecoderStream }
});
IconvLiteDecoderStream.prototype._transform = function(chunk, encoding, done) {
if (!Buffer.isBuffer(chunk))
return done(new Error("Iconv decoding stream needs buffers as its input."));
try {
var res = this.conv.write(chunk);
if (res && res.length) this.push(res, this.encoding);
done();
}
catch (e) {
done(e);
}
}
IconvLiteDecoderStream.prototype._flush = function(done) {
try {
var res = this.conv.end();
if (res && res.length) this.push(res, this.encoding);
done();
}
catch (e) {
done(e);
}
}
IconvLiteDecoderStream.prototype.collect = function(cb) {
var res = '';
this.on('error', cb);
this.on('data', function(chunk) { res += chunk; });
this.on('end', function() {
cb(null, res);
});
return this;
}
|
