/usr/lib/nodejs/pg/binaryParsers.js is in node-pg 0.7.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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offset = offset || 0;
invert = invert || false;
callback = callback || function(lastValue, newValue, bits) { return (lastValue * Math.pow(2, bits)) + newValue; };
var offsetBytes = offset >> 3;
var inv = function(value) {
if (invert) {
return ~value & 0xff;
}
return value;
};
// read first (maybe partial) byte
var mask = 0xff;
var firstBits = 8 - (offset % 8);
if (bits < firstBits) {
mask = (0xff << (8 - bits)) & 0xff;
firstBits = bits;
}
if (offset) {
mask = mask >> (offset % 8);
}
var result = 0;
if ((offset % 8) + bits >= 8) {
result = callback(0, inv(data[offsetBytes]) & mask, firstBits);
}
// read bytes
var bytes = (bits + offset) >> 3;
for (var i = offsetBytes + 1; i < bytes; i++) {
result = callback(result, inv(data[i]), 8);
}
// bits to read, that are not a complete byte
var lastBits = (bits + offset) % 8;
if (lastBits > 0) {
result = callback(result, inv(data[bytes]) >> (8 - lastBits), lastBits);
}
return result;
};
var parseFloatFromBits = function(data, precisionBits, exponentBits) {
var bias = Math.pow(2, exponentBits - 1) - 1;
var sign = parseBits(data, 1);
var exponent = parseBits(data, exponentBits, 1);
if (exponent === 0)
return 0;
// parse mantissa
var precisionBitsCounter = 1;
var parsePrecisionBits = function(lastValue, newValue, bits) {
if (lastValue === 0) {
lastValue = 1;
}
for (var i = 1; i <= bits; i++) {
precisionBitsCounter /= 2;
if ((newValue & (0x1 << (bits - i))) > 0) {
lastValue += precisionBitsCounter;
}
}
return lastValue;
};
var mantissa = parseBits(data, precisionBits, exponentBits + 1, false, parsePrecisionBits);
// special cases
if (exponent == (Math.pow(2, exponentBits + 1) - 1)) {
if (mantissa === 0) {
return (sign === 0) ? Infinity : -Infinity;
}
return NaN;
}
// normale number
return ((sign === 0) ? 1 : -1) * Math.pow(2, exponent - bias) * mantissa;
};
var parseBool = function(value) {
return (parseBits(value, 8) == 1);
};
var parseInt16 = function(value) {
if (parseBits(value, 1) == 1) {
return -1 * (parseBits(value, 15, 1, true) + 1);
}
return parseBits(value, 15, 1);
};
var parseInt32 = function(value) {
if (parseBits(value, 1) == 1) {
return -1 * (parseBits(value, 31, 1, true) + 1);
}
return parseBits(value, 31, 1);
};
var parseInt64 = function(value) {
if (parseBits(value, 1) == 1) {
return -1 * (parseBits(value, 63, 1, true) + 1);
}
return parseBits(value, 63, 1);
};
var parseFloat32 = function(value) {
return parseFloatFromBits(value, 23, 8);
};
var parseFloat64 = function(value) {
return parseFloatFromBits(value, 52, 11);
};
var parseNumeric = function(value) {
var sign = parseBits(value, 16, 32);
if (sign == 0xc000) {
return NaN;
}
var weight = Math.pow(10000, parseBits(value, 16, 16));
var result = 0;
var digits = [];
var ndigits = parseBits(value, 16);
for (var i = 0; i < ndigits; i++) {
result += parseBits(value, 16, 64 + (16 * i)) * weight;
weight /= 10000;
}
var scale = Math.pow(10, parseBits(value, 16, 48));
return ((sign === 0) ? 1 : -1) * Math.round(result * scale) / scale;
};
var parseDate = function(value) {
var sign = parseBits(value, 1);
var rawValue = parseBits(value, 63, 1);
// discard usecs and shift from 2000 to 1970
var result = new Date((((sign === 0) ? 1 : -1) * rawValue / 1000) + 946684800000);
// add microseconds to the date
result.usec = rawValue % 1000;
result.getMicroSeconds = function() {
return this.usec;
};
result.setMicroSeconds = function(value) {
this.usec = value;
};
result.getUTCMicroSeconds = function() {
return this.usec;
};
return result;
};
var parseArray = function(value) {
var dim = parseBits(value, 32);
var flags = parseBits(value, 32, 32);
var elementType = parseBits(value, 32, 64);
var offset = 96;
var dims = [];
for (var i = 0; i < dim; i++) {
// parse dimension
dims[i] = parseBits(value, 32, offset);
offset += 32;
// ignore lower bounds
offset += 32;
}
var parseElement = function(elementType) {
// parse content length
var length = parseBits(value, 32, offset);
offset += 32;
// parse null values
if (length == 0xffffffff) {
return null;
}
if ((elementType == 0x17) || (elementType == 0x14)) {
// int/bigint
var result = parseBits(value, length * 8, offset);
offset += length * 8;
return result;
}
else if (elementType == 0x19) {
// string
var result = value.toString(this.encoding, offset >> 3, (offset += (length << 3)) >> 3);
return result;
}
else {
console.log("ERROR: ElementType not implemented: " + elementType);
}
};
var parse = function(dimension, elementType) {
var array = [];
if (dimension.length > 1) {
var count = dimension.shift();
for (var i = 0; i < count; i++) {
array[i] = parse(dimension, elementType);
}
dimension.unshift(count);
}
else {
for (var i = 0; i < dimension[0]; i++) {
array[i] = parseElement(elementType);
}
}
return array;
};
return parse(dims, elementType);
};
var parseText = function(value) {
return value.toString('utf8');
};
var parseBool = function(value) {
return (parseBits(value, 8) > 0);
};
var init = function(register) {
register(20, parseInt64);
register(21, parseInt16);
register(23, parseInt32);
register(26, parseInt32);
register(1700, parseNumeric);
register(700, parseFloat32);
register(701, parseFloat64);
register(16, parseBool);
register(1114, parseDate);
register(1184, parseDate);
register(1007, parseArray);
register(1016, parseArray);
register(1008, parseArray);
register(1009, parseArray);
register(25, parseText);
};
module.exports = {
init: init
};
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