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An HTML5 Web Sockets Server Module
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<title>Code coverage report for lib/frame.coffee</title>
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<div class="header low">
<h1>Code coverage report for <span class="entity">lib/frame.coffee</span></h1>
<h2>
Statements: <span class="metric">10.46% <small>(16 / 153)</small></span>
Branches: <span class="metric">0% <small>(0 / 70)</small></span>
Functions: <span class="metric">9.09% <small>(1 / 11)</small></span>
Lines: <span class="metric">11.45% <small>(15 / 131)</small></span>
Ignored: <span class="metric"><span class="ignore-none">none</span></span>
</h2>
<div class="path"><a href="../index.html">All files</a> » <a href="index.html">lib/</a> » frame.coffee</div>
</div>
<div class="body">
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">zlib = require 'zlib'
crypto = require 'crypto'
# mask & unmask data
unmask = <span class="fstat-no" title="function not covered" >(data, mask) -></span>
<span class="cstat-no" title="statement not covered" > d1 = new Buffer data.length</span>
<span class="cstat-no" title="statement not covered" > for i in [0...data.length] by 4</span>
<span class="cstat-no" title="statement not covered" > d1[i+3] = data[i+3] ^ mask[3]</span>
<span class="cstat-no" title="statement not covered" > d1[i+2] = data[i+2] ^ mask[2]</span>
<span class="cstat-no" title="statement not covered" > d1[i+1] = data[i+1] ^ mask[1]</span>
<span class="cstat-no" title="statement not covered" > d1[i] = data[i] ^ mask[0]</span>
<span class="cstat-no" title="statement not covered" > mod = data.length % 4</span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > d1[i] = data[i] ^ mask[0] if m</span>od > 0</span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > d1[i+1] = data[i+1] ^ mask[0] if m</span>od > 1</span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > d1[i+2] = data[i+2] ^ mask[0] if m</span>od > 2</span>
<span class="cstat-no" title="statement not covered" > d1</span>
# inflate frame
inflate = <span class="fstat-no" title="function not covered" >(frame, stream, cb) -></span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > return cb null, frame unless </span>frame.rsv1</span>
<span class="cstat-no" title="statement not covered" > stream.once 'error', <span class="fstat-no" title="function not covered" >(err) -></span></span>
<span class="cstat-no" title="statement not covered" > cb err</span>
<span class="cstat-no" title="statement not covered" > stream.once 'data', <span class="fstat-no" title="function not covered" >(data) -></span></span>
<span class="cstat-no" title="statement not covered" > frame.data = data</span>
<span class="cstat-no" title="statement not covered" > cb null, frame</span>
<span class="cstat-no" title="statement not covered" > len = frame.data.length</span>
<span class="cstat-no" title="statement not covered" > b = new Buffer len + 4</span>
<span class="cstat-no" title="statement not covered" > b[len] = 0x00</span>
<span class="cstat-no" title="statement not covered" > b[len+1] = 0x00</span>
<span class="cstat-no" title="statement not covered" > b[len+2] = 0xff</span>
<span class="cstat-no" title="statement not covered" > b[len+3] = 0xff</span>
<span class="cstat-no" title="statement not covered" > frame.data.copy b</span>
<span class="cstat-no" title="statement not covered" > stream.write b</span>
return
# zlib.inflateRaw frame.data, (err, data) ->
# return cb err if err
# frame.data = data
# cb null, frame
# opcodes defines
opcodes = [
'continue', 'text', 'binary'
'non-control 3', 'non-control 4', 'non-control 5', 'non-control 6',' non-control 7'
'close', 'ping', 'pong'
'control B', 'control C', 'control D', 'control E',' control F'
]
# unpack frame
unpack = <span class="fstat-no" title="function not covered" >(buf, frame) -></span>
# 2+ chunks
<span class="cstat-no" title="statement not covered" > if frame</span>
<span class="cstat-no" title="statement not covered" > if buf.length > frame.left</span>
<span class="cstat-no" title="statement not covered" > frame.data.push buf.slice 0, frame.left</span>
<span class="cstat-no" title="statement not covered" > buf = buf.slice frame.left</span>
<span class="cstat-no" title="statement not covered" > frame.left = 0</span>
else
<span class="cstat-no" title="statement not covered" > frame.data.push buf</span>
<span class="cstat-no" title="statement not covered" > frame.left -= buf.length</span>
<span class="cstat-no" title="statement not covered" > buf = null</span>
# first chunk
else
<span class="cstat-no" title="statement not covered" > b1 = buf[0]</span>
<span class="cstat-no" title="statement not covered" > b2 = buf[1]</span>
<span class="cstat-no" title="statement not covered" > frame =</span>
# first byte
fin : 0 < (b1 & 0x80)
rsv1 : 0 < (b1 & 0x40)
rsv2 : 0 < (b1 & 0x20)
rsv3 : 0 < (b1 & 0x10)
opcode : opcodes[b1 & 0xf]
# second byte
mask : 0 < (b2 & 128)
length : b2 & 127
data : []
left : 0
done : false
<span class="cstat-no" title="statement not covered" > idx = 2</span>
<span class="cstat-no" title="statement not covered" > if frame.length > 0</span>
# mid length
<span class="cstat-no" title="statement not covered" > if frame.length is 126</span>
<span class="cstat-no" title="statement not covered" > frame.length = buf.readUInt16BE(2, true)</span>
<span class="cstat-no" title="statement not covered" > idx = 4</span>
# long length
else <span class="cstat-no" title="statement not covered" >if frame.length is 127</span>
<span class="cstat-no" title="statement not covered" > frame.length = buf.readUInt32BE(2, true) * 0xffffffff + buf.readUInt32BE(6, true)</span>
<span class="cstat-no" title="statement not covered" > idx = 10</span>
# maskkey
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > frame.maskKey = buf.slice idx, idx +=4 if frame.mask</span></span>
# set data chunk
<span class="cstat-no" title="statement not covered" > frame.data.push buf.slice idx, idx += frame.length</span>
# calc left bytes
<span class="cstat-no" title="statement not covered" > frame.left = frame.length - frame.data[0].length</span>
# cut buffer
<span class="cstat-no" title="statement not covered" > if buf.length > idx</span>
<span class="cstat-no" title="statement not covered" > buf = buf.slice idx</span>
else
<span class="cstat-no" title="statement not covered" > buf = null</span>
# check done
<span class="cstat-no" title="statement not covered" > if frame.left is 0</span>
# not empty frame
<span class="cstat-no" title="statement not covered" > if frame.length > 0</span>
# concat to one big buffer
<span class="cstat-no" title="statement not covered" > frame.data = Buffer.concat frame.data</span>
# unmask
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > frame.data = unmask frame.data, frame.maskKey if frame.mask and frame.length > 0</span></span>
else <span class="cstat-no" title="statement not covered" >frame.data = null</span>
<span class="cstat-no" title="statement not covered" > frame.done = true</span>
# remove left
<span class="cstat-no" title="statement not covered" > delete frame.left</span>
<span class="cstat-no" title="statement not covered" > [frame, buf]</span>
pack = <span class="fstat-no" title="function not covered" >(frame, data) -></span>
# set first byte
<span class="cstat-no" title="statement not covered" > b1 = opcodesMap[frame.opcode]</span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > b1 |= 0x10 if frame.rsv3</span></span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > b1 |= 0x20 if frame.rsv2</span></span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > b1 |= 0x40 if frame.rsv1</span></span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > b1 |= 0x80 if frame.fin</span></span>
<span class="cstat-no" title="statement not covered" > dlen = if data? then data.length else 0</span>
# length flag
<span class="cstat-no" title="statement not covered" > if dlen > 0xffff</span>
<span class="cstat-no" title="statement not covered" > lenFix = 10</span>
<span class="cstat-no" title="statement not covered" > plen = 127</span>
else <span class="cstat-no" title="statement not covered" >if dlen >= 126</span>
<span class="cstat-no" title="statement not covered" > lenFix = 4</span>
<span class="cstat-no" title="statement not covered" > plen = 126</span>
else
<span class="cstat-no" title="statement not covered" > lenFix = 2</span>
<span class="cstat-no" title="statement not covered" > plen = dlen</span>
# no mask if no data
<span class="cstat-no" title="statement not covered" > if dlen is 0</span>
<span class="cstat-no" title="statement not covered" > frame.mask = false</span>
# second byte
<span class="cstat-no" title="statement not covered" > b2 = plen</span>
# use mask
<span class="cstat-no" title="statement not covered" > if frame.mask</span>
<span class="cstat-no" title="statement not covered" > b2 |= 0x80</span>
<span class="cstat-no" title="statement not covered" > buf = new Buffer lenFix + 4 + dlen</span>
<span class="cstat-no" title="statement not covered" > frame.maskKey = crypto.randomBytes(4)</span>
<span class="cstat-no" title="statement not covered" > frame.maskKey.copy buf, lenFix</span>
<span class="cstat-no" title="statement not covered" > lenFix += 4</span>
<span class="cstat-no" title="statement not covered" > data = unmask(data, frame.maskKey)</span>
else
<span class="cstat-no" title="statement not covered" > buf = new Buffer lenFix + dlen</span>
<span class="cstat-no" title="statement not covered" > buf[0] = b1</span>
<span class="cstat-no" title="statement not covered" > buf[1] = b2</span>
# length extends
<span class="cstat-no" title="statement not covered" > if dlen > 0xffff</span>
<span class="cstat-no" title="statement not covered" > buf.writeUInt32BE Math.floor(dlen / 0xffffffff), 2, true</span>
<span class="cstat-no" title="statement not covered" > buf.writeUInt32BE dlen % 0xffffffff, 6, true</span>
else <span class="cstat-no" title="statement not covered" >if dlen >= 126</span>
<span class="cstat-no" title="statement not covered" > buf.writeUInt16BE dlen, 2, true</span>
<span class="cstat-no" title="statement not covered" > if dlen > 0</span>
# set data
<span class="cstat-no" title="statement not covered" > data.copy buf, lenFix</span>
<span class="cstat-no" title="statement not covered" > buf</span>
opcodesMap =
'continue' : 0, 'text' : 1
'binary' : 2, 'close' : 8
'ping' : 9, 'pong' : 10
class Frame
<span class="fstat-no" title="function not covered" > constructor : (prop) -></span>
<span class="cstat-no" title="statement not covered" > @minDeflateLength = 32</span>
<span class="cstat-no" title="statement not covered" > @opcode = 'text'</span>
<span class="cstat-no" title="statement not covered" > @fin = false</span>
<span class="cstat-no" title="statement not covered" > @rsv1 = false</span>
<span class="cstat-no" title="statement not covered" > @rsv2 = false</span>
<span class="cstat-no" title="statement not covered" > @rsv3 = false</span>
<span class="cstat-no" title="statement not covered" > @mask = false</span>
<span class="cstat-no" title="statement not covered" > @data = null</span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > (<span class="cstat-no" title="statement not covered" >@[k] = prop[k] if prop) for k of prop</span></span></span>
pack : <span class="fstat-no" title="function not covered" >(deflate, cb) -></span>
<span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" > return cb new Error "Opcode Not Found \"#{@opcode}\"" unless opcodesMap[@opcode]?</span></span>
# data to buffer
<span class="cstat-no" title="statement not covered" > unless @data?</span>
<span class="cstat-no" title="statement not covered" > data = null</span>
else <span class="cstat-no" title="statement not covered" >if @data instanceof Buffer</span>
<span class="cstat-no" title="statement not covered" > data = @data</span>
else
<span class="cstat-no" title="statement not covered" > data = new Buffer if typeof @data is 'string' then @data else @data.toString()</span>
# check length for deflate
<span class="cstat-no" title="statement not covered" > if deflate && data.length < @minDeflateLength</span>
<span class="cstat-no" title="statement not covered" > deflate = false</span>
# if use deflate
<span class="cstat-no" title="statement not covered" > if deflate</span>
<span class="cstat-no" title="statement not covered" > @rsv1 = true</span>
<span class="cstat-no" title="statement not covered" > zlib.deflateRaw data, (err, data) =></span>
# return cb err if err
<span class="cstat-no" title="statement not covered" > cb null, pack @, data</span>
return
else
<span class="cstat-no" title="statement not covered" > @rsv1 = false</span>
<span class="cstat-no" title="statement not covered" > cb null, pack @, data</span>
return
exports.unpack = unpack
exports.inflate = inflate
exports.Frame = Frame
</pre></td></tr>
</table></pre>
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