/usr/lib/nodejs/fstream/lib/file-reader.js is in node-fstream 0.1.24-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | // Basically just a wrapper around an fs.ReadStream
module.exports = FileReader
var fs = require("graceful-fs")
, fstream = require("../fstream.js")
, Reader = fstream.Reader
, inherits = require("inherits")
, mkdir = require("mkdirp")
, Reader = require("./reader.js")
, EOF = {EOF: true}
, CLOSE = {CLOSE: true}
inherits(FileReader, Reader)
function FileReader (props) {
// console.error(" FR create", props.path, props.size, new Error().stack)
var me = this
if (!(me instanceof FileReader)) throw new Error(
"FileReader must be called as constructor.")
// should already be established as a File type
// XXX Todo: preserve hardlinks by tracking dev+inode+nlink,
// with a HardLinkReader class.
if (!((props.type === "Link" && props.Link) ||
(props.type === "File" && props.File))) {
throw new Error("Non-file type "+ props.type)
}
me._buffer = []
me._bytesEmitted = 0
Reader.call(me, props)
}
FileReader.prototype._getStream = function () {
var me = this
, stream = me._stream = fs.createReadStream(me._path, me.props)
if (me.props.blksize) {
stream.bufferSize = me.props.blksize
}
stream.on("open", me.emit.bind(me, "open"))
stream.on("data", function (c) {
// console.error("\t\t%d %s", c.length, me.basename)
me._bytesEmitted += c.length
// no point saving empty chunks
if (!c.length) return
else if (me._paused || me._buffer.length) {
me._buffer.push(c)
me._read()
} else me.emit("data", c)
})
stream.on("end", function () {
if (me._paused || me._buffer.length) {
// console.error("FR Buffering End", me._path)
me._buffer.push(EOF)
me._read()
} else {
me.emit("end")
}
if (me._bytesEmitted !== me.props.size) {
me.error("Didn't get expected byte count\n"+
"expect: "+me.props.size + "\n" +
"actual: "+me._bytesEmitted)
}
})
stream.on("close", function () {
if (me._paused || me._buffer.length) {
// console.error("FR Buffering Close", me._path)
me._buffer.push(CLOSE)
me._read()
} else {
// console.error("FR close 1", me._path)
me.emit("close")
}
})
me._read()
}
FileReader.prototype._read = function () {
var me = this
// console.error("FR _read", me._path)
if (me._paused) {
// console.error("FR _read paused", me._path)
return
}
if (!me._stream) {
// console.error("FR _getStream calling", me._path)
return me._getStream()
}
// clear out the buffer, if there is one.
if (me._buffer.length) {
// console.error("FR _read has buffer", me._buffer.length, me._path)
var buf = me._buffer
for (var i = 0, l = buf.length; i < l; i ++) {
var c = buf[i]
if (c === EOF) {
// console.error("FR Read emitting buffered end", me._path)
me.emit("end")
} else if (c === CLOSE) {
// console.error("FR Read emitting buffered close", me._path)
me.emit("close")
} else {
// console.error("FR Read emitting buffered data", me._path)
me.emit("data", c)
}
if (me._paused) {
// console.error("FR Read Re-pausing at "+i, me._path)
me._buffer = buf.slice(i)
return
}
}
me._buffer.length = 0
}
// console.error("FR _read done")
// that's about all there is to it.
}
FileReader.prototype.pause = function (who) {
var me = this
// console.error("FR Pause", me._path)
if (me._paused) return
who = who || me
me._paused = true
if (me._stream) me._stream.pause()
me.emit("pause", who)
}
FileReader.prototype.resume = function (who) {
var me = this
// console.error("FR Resume", me._path)
if (!me._paused) return
who = who || me
me.emit("resume", who)
me._paused = false
if (me._stream) me._stream.resume()
me._read()
}
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