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41 lines
982 B
41 lines
982 B
'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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