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