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index.js
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index.js
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'use strict'
var C = require('./constants')
exports.CONSTANTS = C
exports.STATUS_CODES = require('./status-codes')
exports.request = {
decode: function () {
var obj = decode.apply(null, arguments)
exports.request.decode.bytes = decode.bytes
obj.operationId = obj._oprationIdOrStatusCode
delete obj._oprationIdOrStatusCode
return obj
},
encode: encode,
encodingLength: encodingLength
}
exports.response = {
decode: function () {
var obj = decode.apply(null, arguments)
exports.response.decode.bytes = decode.bytes
obj.statusCode = obj._oprationIdOrStatusCode
delete obj._oprationIdOrStatusCode
return obj
},
encode: encode,
encodingLength: encodingLength
}
function decode (buf, start, end) {
if (!start) start = 0
if (!end) end = buf.length
var offset = start
var obj = {
version: {},
groups: []
}
obj.version.major = buf.readInt8(offset++)
obj.version.minor = buf.readInt8(offset++)
obj._oprationIdOrStatusCode = buf.readInt16BE(offset)
offset += 2
obj.requestId = buf.readInt32BE(offset)
offset += 4
// attribute groups
var tag = buf.readInt8(offset++) // delimiter-tag
while (tag !== C.END_OF_ATTRIBUTES_TAG && offset < end) {
var group = { tag: tag, attributes: [] }
// attribute-with-one-value or additional-value
tag = buf.readInt8(offset++) // value-tag
while (tag > 0x0f) {
var name = str.decode(buf, offset)
offset += str.decode.bytes
var val
switch (tag) {
case C.INTEGER:
val = tint.decode(buf, offset)
offset += tint.decode.bytes
break
case C.BOOLEAN:
val = tbool.decode(buf, offset)
offset += tbool.decode.bytes
break
case C.ENUM:
val = tenum.decode(buf, offset)
offset += tenum.decode.bytes
break
case C.DATE_TIME:
val = tdatetime.decode(buf, offset)
offset += tdatetime.decode.bytes
break
case C.TEXT_WITH_LANG:
case C.NAME_WITH_LANG:
val = langstr.decode(buf, offset)
offset += langstr.decode.bytes
break
default:
val = str.decode(buf, offset)
offset += str.decode.bytes
}
if (!name) {
attr.value.push(val)
} else {
var attr = { tag: tag, name: name, value: [val] }
group.attributes.push(attr)
}
tag = buf.readInt8(offset++) // delimiter-tag or value-tag
}
obj.groups.push(group)
}
decode.bytes = offset - start
return obj
}
function encode (obj, buf, offset) {
if (!buf) buf = new Buffer(encodingLength(obj))
if (!offset) offset = 0
var oldOffset = offset
buf.writeInt8(obj.version ? obj.version.major : 1, offset++)
buf.writeInt8(obj.version ? obj.version.minor : 1, offset++)
buf.writeInt16BE(obj.statusCode === undefined ? obj.operationId : obj.statusCode, offset)
offset += 2
buf.writeInt32BE(obj.requestId, offset)
offset += 4
if (obj.groups) {
obj.groups.forEach(function (group) {
buf.writeInt8(group.tag, offset++)
group.attributes.forEach(function (attr) {
var value = Array.isArray(attr.value) ? attr.value : [attr.value]
value.forEach(function (val, i) {
buf.writeInt8(attr.tag, offset++)
str.encode(i ? '' : attr.name, buf, offset)
offset += str.encode.bytes
switch (attr.tag) {
case C.INTEGER:
tint.encode(val, buf, offset)
offset += tint.encode.bytes
break
case C.BOOLEAN:
tbool.encode(val, buf, offset)
offset += tbool.encode.bytes
break
case C.ENUM:
tenum.encode(val, buf, offset)
offset += tenum.encode.bytes
break
case C.DATE_TIME:
tdatetime.encode(val, buf, offset)
offset += tdatetime.encode.bytes
break
case C.TEXT_WITH_LANG:
case C.NAME_WITH_LANG:
langstr.encode(val, buf, offset)
offset += langstr.encode.bytes
break
default:
str.encode(val, buf, offset)
offset += str.encode.bytes
}
})
})
})
}
buf.writeInt8(C.END_OF_ATTRIBUTES_TAG, offset++)
if (obj.data) offset += obj.data.copy(buf, offset)
encode.bytes = offset - oldOffset
return buf
}
function encodingLength (obj) {
var len = 8 // version-number + status-code + request-id
if (obj.groups) {
len += obj.groups.reduce(function (len, group) {
len += 1 // begin-attribute-group-tag
len += group.attributes.reduce(function (len, attr) {
var value = Array.isArray(attr.value) ? attr.value : [attr.value]
len += value.reduce(function (len, val) {
len += 1 // value-tag
len += str.encodingLength(len === 1 ? attr.name : '')
switch (attr.tag) {
case C.INTEGER: return len + tint.encodingLength(val)
case C.BOOLEAN: return len + tbool.encodingLength(val)
case C.ENUM: return len + tenum.encodingLength(val)
case C.DATE_TIME: return len + tdatetime.encodingLength(val)
case C.TEXT_WITH_LANG:
case C.NAME_WITH_LANG: return len + langstr.encodingLength(val)
default: return len + str.encodingLength(val)
}
}, 0)
return len
}, 0)
return len
}, 0)
}
len++ // end-of-attributes-tag
if (obj.data) len += obj.data.length
return len
}
var tint = {}
tint.decode = function (buf, offset) {
var i = buf.readInt32BE(offset + 2)
tint.decode.bytes = 6
return i
}
tint.encode = function (i, buf, offset) {
buf.writeInt16BE(4, offset)
buf.writeInt32BE(i, offset + 2)
tint.encode.bytes = 6
return buf
}
tint.encodingLength = function (s) {
return 6
}
var tenum = {}
tenum.decode = function (buf, offset) {
var i = buf.readInt32BE(offset + 2)
tenum.decode.bytes = 6
return i
}
tenum.encode = function (i, buf, offset) {
buf.writeInt16BE(4, offset)
buf.writeInt32BE(i, offset + 2)
tenum.encode.bytes = 6
return buf
}
tenum.encodingLength = function (s) {
return 6
}
var tbool = {}
tbool.decode = function (buf, offset) {
var b = buf.readInt8(offset + 2) === C.TRUE
tbool.decode.bytes = 3
return b
}
tbool.encode = function (b, buf, offset) {
buf.writeInt16BE(1, offset)
buf.writeInt8(b ? C.TRUE : C.FALSE, offset + 2)
tbool.encode.bytes = 3
return buf
}
tbool.encodingLength = function (s) {
return 3
}
var langstr = {}
langstr.decode = function (buf, offset) {
var oldOffset = offset
offset += 2
var lang = str.decode(buf, offset)
offset += str.decode.bytes
var val = str.decode(buf, offset)
offset += str.decode.bytes
langstr.decode.bytes = offset - oldOffset
return { lang: lang, value: val }
}
langstr.encode = function (obj, buf, offset) {
str.encode(obj.lang, buf, offset + 2)
var len = str.encode.bytes
str.encode(obj.value, buf, offset + 2 + len)
len += str.encode.bytes
buf.writeInt16BE(len, offset)
langstr.encode.bytes = len + 2
return buf
}
langstr.encodingLength = function (obj) {
return Buffer.byteLength(obj.lang) + Buffer.byteLength(obj.value) + 6
}
var str = {}
str.decode = function (buf, offset) {
var len = buf.readInt16BE(offset)
var s = buf.toString('utf-8', offset + 2, offset + 2 + len)
str.decode.bytes = len + 2
return s
}
str.encode = function (s, buf, offset) {
var len = buf.write(s, offset + 2)
buf.writeInt16BE(len, offset)
str.encode.bytes = len + 2
return buf
}
str.encodingLength = function (s) {
return Buffer.byteLength(s) + 2
}
var tdatetime = {}
tdatetime.decode = function (buf, offset) {
var drift = (buf.readInt8(offset + 11) * 60) + buf.readInt8(offset + 12)
if (buf.slice(offset + 10, offset + 11) === '+') drift = drift * -1
var d = new Date(Date.UTC(
buf.readInt16BE(offset + 2),
buf.readInt8(offset + 4) - 1,
buf.readInt8(offset + 5),
buf.readInt8(offset + 6),
buf.readInt8(offset + 7) + drift,
buf.readInt8(offset + 8),
buf.readInt8(offset + 9) * 100
))
tdatetime.decode.bytes = 13
return d
}
tdatetime.encode = function (d, buf, offset) {
buf.writeInt16BE(11, offset)
buf.writeInt16BE(d.getFullYear(), offset + 2)
buf.writeInt8(d.getMonth() + 1, offset + 4)
buf.writeInt8(d.getDate(), offset + 5)
buf.writeInt8(d.getHours(), offset + 6)
buf.writeInt8(d.getMinutes(), offset + 7)
buf.writeInt8(d.getSeconds(), offset + 8)
buf.writeInt8(Math.floor(d.getMilliseconds() / 100), offset + 9)
buf.write(d.getTimezoneOffset() > 0 ? '-' : '+', offset + 10)
buf.writeInt8(d.getTimezoneOffset() / 60, offset + 11)
buf.writeInt8(d.getTimezoneOffset() % 60, offset + 12)
tdatetime.encode.bytes = 13
return buf
}
tdatetime.encodingLength = function (s) {
return 13
}