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- fs = require "fs"
- logger = require "logger-sharelatex"
- module.exports = SafeReader =
- # safely read up to size bytes from a file and return result as a
- # string
- readFile: (file, size, encoding, callback = (error, result) ->) ->
- fs.open file, 'r', (err, fd) ->
- return callback() if err? and err.code is 'ENOENT'
- return callback(err) if err?
- # safely return always closing the file
- callbackWithClose = (err, result...) ->
- fs.close fd, (err1) ->
- return callback(err) if err?
- return callback(err1) if err1?
- callback(null, result...)
- buff = new Buffer(size, 0) # fill with zeros
- fs.read fd, buff, 0, buff.length, 0, (err, bytesRead, buffer) ->
- return callbackWithClose(err) if err?
- result = buffer.toString(encoding, 0, bytesRead)
- callbackWithClose(null, result, bytesRead)
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