calculate_size.js
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'use strict';
var Long = require('../long').Long,
Double = require('../double').Double,
Timestamp = require('../timestamp').Timestamp,
ObjectID = require('../objectid').ObjectID,
Symbol = require('../symbol').Symbol,
BSONRegExp = require('../regexp').BSONRegExp,
Code = require('../code').Code,
Decimal128 = require('../decimal128'),
MinKey = require('../min_key').MinKey,
MaxKey = require('../max_key').MaxKey,
DBRef = require('../db_ref').DBRef,
Binary = require('../binary').Binary;
var normalizedFunctionString = require('./utils').normalizedFunctionString;
// To ensure that 0.4 of node works correctly
var isDate = function isDate(d) {
return typeof d === 'object' && Object.prototype.toString.call(d) === '[object Date]';
};
var calculateObjectSize = function calculateObjectSize(
object,
serializeFunctions,
ignoreUndefined
) {
var totalLength = 4 + 1;
if (Array.isArray(object)) {
for (var i = 0; i < object.length; i++) {
totalLength += calculateElement(
i.toString(),
object[i],
serializeFunctions,
true,
ignoreUndefined
);
}
} else {
// If we have toBSON defined, override the current object
if (object.toBSON) {
object = object.toBSON();
}
// Calculate size
for (var key in object) {
totalLength += calculateElement(key, object[key], serializeFunctions, false, ignoreUndefined);
}
}
return totalLength;
};
/**
* @ignore
* @api private
*/
function calculateElement(name, value, serializeFunctions, isArray, ignoreUndefined) {
// If we have toBSON defined, override the current object
if (value && value.toBSON) {
value = value.toBSON();
}
switch (typeof value) {
case 'string':
return 1 + Buffer.byteLength(name, 'utf8') + 1 + 4 + Buffer.byteLength(value, 'utf8') + 1;
case 'number':
if (Math.floor(value) === value && value >= BSON.JS_INT_MIN && value <= BSON.JS_INT_MAX) {
if (value >= BSON.BSON_INT32_MIN && value <= BSON.BSON_INT32_MAX) {
// 32 bit
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (4 + 1);
} else {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
}
} else {
// 64 bit
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
}
case 'undefined':
if (isArray || !ignoreUndefined)
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + 1;
return 0;
case 'boolean':
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (1 + 1);
case 'object':
if (
value == null ||
value instanceof MinKey ||
value instanceof MaxKey ||
value['_bsontype'] === 'MinKey' ||
value['_bsontype'] === 'MaxKey'
) {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + 1;
} else if (value instanceof ObjectID || value['_bsontype'] === 'ObjectID') {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (12 + 1);
} else if (value instanceof Date || isDate(value)) {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
} else if (typeof Buffer !== 'undefined' && Buffer.isBuffer(value)) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (1 + 4 + 1) + value.length
);
} else if (
value instanceof Long ||
value instanceof Double ||
value instanceof Timestamp ||
value['_bsontype'] === 'Long' ||
value['_bsontype'] === 'Double' ||
value['_bsontype'] === 'Timestamp'
) {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (8 + 1);
} else if (value instanceof Decimal128 || value['_bsontype'] === 'Decimal128') {
return (name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (16 + 1);
} else if (value instanceof Code || value['_bsontype'] === 'Code') {
// Calculate size depending on the availability of a scope
if (value.scope != null && Object.keys(value.scope).length > 0) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
4 +
4 +
Buffer.byteLength(value.code.toString(), 'utf8') +
1 +
calculateObjectSize(value.scope, serializeFunctions, ignoreUndefined)
);
} else {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
4 +
Buffer.byteLength(value.code.toString(), 'utf8') +
1
);
}
} else if (value instanceof Binary || value['_bsontype'] === 'Binary') {
// Check what kind of subtype we have
if (value.sub_type === Binary.SUBTYPE_BYTE_ARRAY) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
(value.position + 1 + 4 + 1 + 4)
);
} else {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) + (value.position + 1 + 4 + 1)
);
}
} else if (value instanceof Symbol || value['_bsontype'] === 'Symbol') {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
Buffer.byteLength(value.value, 'utf8') +
4 +
1 +
1
);
} else if (value instanceof DBRef || value['_bsontype'] === 'DBRef') {
// Set up correct object for serialization
var ordered_values = {
$ref: value.namespace,
$id: value.oid
};
// Add db reference if it exists
if (null != value.db) {
ordered_values['$db'] = value.db;
}
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
calculateObjectSize(ordered_values, serializeFunctions, ignoreUndefined)
);
} else if (
value instanceof RegExp ||
Object.prototype.toString.call(value) === '[object RegExp]'
) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
Buffer.byteLength(value.source, 'utf8') +
1 +
(value.global ? 1 : 0) +
(value.ignoreCase ? 1 : 0) +
(value.multiline ? 1 : 0) +
1
);
} else if (value instanceof BSONRegExp || value['_bsontype'] === 'BSONRegExp') {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
Buffer.byteLength(value.pattern, 'utf8') +
1 +
Buffer.byteLength(value.options, 'utf8') +
1
);
} else {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
calculateObjectSize(value, serializeFunctions, ignoreUndefined) +
1
);
}
case 'function':
// WTF for 0.4.X where typeof /someregexp/ === 'function'
if (
value instanceof RegExp ||
Object.prototype.toString.call(value) === '[object RegExp]' ||
String.call(value) === '[object RegExp]'
) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
Buffer.byteLength(value.source, 'utf8') +
1 +
(value.global ? 1 : 0) +
(value.ignoreCase ? 1 : 0) +
(value.multiline ? 1 : 0) +
1
);
} else {
if (serializeFunctions && value.scope != null && Object.keys(value.scope).length > 0) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
4 +
4 +
Buffer.byteLength(normalizedFunctionString(value), 'utf8') +
1 +
calculateObjectSize(value.scope, serializeFunctions, ignoreUndefined)
);
} else if (serializeFunctions) {
return (
(name != null ? Buffer.byteLength(name, 'utf8') + 1 : 0) +
1 +
4 +
Buffer.byteLength(normalizedFunctionString(value), 'utf8') +
1
);
}
}
}
return 0;
}
var BSON = {};
// BSON MAX VALUES
BSON.BSON_INT32_MAX = 0x7fffffff;
BSON.BSON_INT32_MIN = -0x80000000;
// JS MAX PRECISE VALUES
BSON.JS_INT_MAX = 0x20000000000000; // Any integer up to 2^53 can be precisely represented by a double.
BSON.JS_INT_MIN = -0x20000000000000; // Any integer down to -2^53 can be precisely represented by a double.
module.exports = calculateObjectSize;