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'use strict';
const Buffer = require('buffer').Buffer;
const { writeBuffer } = internalBinding('fs');
const errors = require('internal/errors');
// IPv4 Segment
const v4Seg = '(?:[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
const v4Str = `(${v4Seg}[.]){3}${v4Seg}`;
const IPv4Reg = new RegExp(`^${v4Str}$`);
// IPv6 Segment
const v6Seg = '(?:[0-9a-fA-F]{1,4})';
const IPv6Reg = new RegExp('^(' +
`(?:${v6Seg}:){7}(?:${v6Seg}|:)|` +
`(?:${v6Seg}:){6}(?:${v4Str}|:${v6Seg}|:)|` +
`(?:${v6Seg}:){5}(?::${v4Str}|(:${v6Seg}){1,2}|:)|` +
`(?:${v6Seg}:){4}(?:(:${v6Seg}){0,1}:${v4Str}|(:${v6Seg}){1,3}|:)|` +
`(?:${v6Seg}:){3}(?:(:${v6Seg}){0,2}:${v4Str}|(:${v6Seg}){1,4}|:)|` +
`(?:${v6Seg}:){2}(?:(:${v6Seg}){0,3}:${v4Str}|(:${v6Seg}){1,5}|:)|` +
`(?:${v6Seg}:){1}(?:(:${v6Seg}){0,4}:${v4Str}|(:${v6Seg}){1,6}|:)|` +
`(?::((?::${v6Seg}){0,5}:${v4Str}|(?::${v6Seg}){1,7}|:))` +
')(%[0-9a-zA-Z]{1,})?$');
function isIPv4(s) {
return IPv4Reg.test(s);
}
function isIPv6(s) {
return IPv6Reg.test(s);
}
function isIP(s) {
if (isIPv4(s)) return 4;
if (isIPv6(s)) return 6;
return 0;
}
// Check that the port number is not NaN when coerced to a number,
// is an integer and that it falls within the legal range of port numbers.
function isLegalPort(port) {
if ((typeof port !== 'number' && typeof port !== 'string') ||
(typeof port === 'string' && port.trim().length === 0))
return false;
return +port === (+port >>> 0) && port <= 0xFFFF;
}
function makeSyncWrite(fd) {
return function(chunk, enc, cb) {
if (enc !== 'buffer')
chunk = Buffer.from(chunk, enc);
this._handle.bytesWritten += chunk.length;
const ctx = {};
writeBuffer(fd, chunk, 0, chunk.length, null, undefined, ctx);
if (ctx.errno !== undefined) {
const ex = errors.uvException(ctx);
ex.errno = ctx.errno;
return cb(ex);
}
cb();
};
}
module.exports = {
isIP,
isIPv4,
isIPv6,
isLegalPort,
makeSyncWrite,
normalizedArgsSymbol: Symbol('normalizedArgs')
};