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check if file is optimised before running qpdf

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This commit is contained in:
Brian Gough
2017-04-04 16:50:06 +01:00
parent 834ad57312
commit eb1364f249
2 changed files with 119 additions and 1 deletions
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17
app/coffee/OutputFileOptimiser.coffee
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@@ -11,10 +11,25 @@ module.exports = OutputFileOptimiser =
# check output file (src) and see if we can optimise it, storing
# the result in the build directory (dst)
if src.match(/\/output\.pdf$/)
OutputFileOptimiser.optimisePDF src, dst, callback
OutputFileOptimiser.checkIfPDFIsOptimised src, (err, isOptimised) ->
return callback(null) if err? or isOptimised
OutputFileOptimiser.optimisePDF src, dst, callback
else
callback (null)
checkIfPDFIsOptimised: (file, callback) ->
SIZE = 16*1024 # check the header of the pdf
result = new Buffer(SIZE)
result.fill(0) # prevent leakage of uninitialised buffer
fs.open file, "r", (err, fd) ->
return callback(err) if err?
fs.read fd, result, 0, SIZE, 0, (errRead, bytesRead, buffer) ->
fs.close fd, (errClose) ->
return callback(errRead) if errRead?
return callback(errClose) if errReadClose?
isOptimised = buffer.toString('ascii').indexOf("/Linearized 1") >= 0
callback(null, isOptimised)
optimisePDF: (src, dst, callback = (error) ->) ->
tmpOutput = dst + '.opt'
args = ["--linearize", src, tmpOutput]