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'use strict'
const fs = require('graceful-fs')
const BUF_LENGTH = 64 * 1024
const _buff = require('../util/buffer')(BUF_LENGTH)
function copyFileSync (srcFile, destFile, options) {
const overwrite = options.overwrite
const errorOnExist = options.errorOnExist
const preserveTimestamps = options.preserveTimestamps
if (fs.existsSync(destFile)) {
if (overwrite) {
fs.unlinkSync(destFile)
} else if (errorOnExist) {
throw new Error(`${destFile} already exists`)
} else return
}
const fdr = fs.openSync(srcFile, 'r')
const stat = fs.fstatSync(fdr)
const fdw = fs.openSync(destFile, 'w', stat.mode)
let bytesRead = 1
let pos = 0
while (bytesRead > 0) {
bytesRead = fs.readSync(fdr, _buff, 0, BUF_LENGTH, pos)
fs.writeSync(fdw, _buff, 0, bytesRead)
pos += bytesRead
}
if (preserveTimestamps) {
fs.futimesSync(fdw, stat.atime, stat.mtime)
}
fs.closeSync(fdr)
fs.closeSync(fdw)
}
module.exports = copyFileSync
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