How to use the yauzl.RandomAccessReader function in yauzl
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TimelordUK / jspurefix / src / util / unzip.js View on Github 
// resolve optional parameters
if (offsetArg == null) offsetArg = 0
if (lenArg == null && endArg == null) endArg = stats.size
if (endArg == null) endArg = lenArg + offsetArg
else if (endArg < 0) endArg = stats.size + endArg
// validate parameters
if (offsetArg < 0) throw new Error('--offset < 0')
if (lenArg < 0) throw new Error('--len < 0')
if (offsetArg > endArg) throw new Error('--offset > --end')
if (endArg > stats.size) throw new Error('--end/--len goes past EOF')
// extend RandomAccessReader
function MiddleOfFileReader () {
yauzl.RandomAccessReader.call(this)
}
util.inherits(MiddleOfFileReader, yauzl.RandomAccessReader)
// implement required and option methods
MiddleOfFileReader.prototype._readStreamForRange = function (start, end) {
return fs.createReadStream(null, {
fd: fd,
// shift the start and end offsets
start: start + offsetArg,
end: end + offsetArg - 1, // the -1 is because fs.createReadStream()'s end option is inclusive
autoClose: false
})
}
MiddleOfFileReader.prototype.read = function (buffer, offset, length, position, callback) {
// shift the position
fs.read(fd, buffer, offset, length, position + offsetArg, callback)
}
MiddleOfFileReader.prototype.close = function (callback) {
fs.close(fd, callback)function MiddleOfFileReader () {
yauzl.RandomAccessReader.call(this)
}
util.inherits(MiddleOfFileReader, yauzl.RandomAccessReader)
