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