Debugging ZIP-ed shapefile parsing?

[paultobey]

I have a zipped shapefile that generally works with stand-along shapefile tools, but which fails with the demo upload application. The error generated are:

shit RangeError: Invalid DataView length -4
at new DataView ()
at ParseShp.getRow (shp.js:sourcemap:419)
at ParseShp.getRows (shp.js:sourcemap:407)
at new ParseShp (shp.js:sourcemap:371)
at module.exports (shp.js:sourcemap:429)
at shp.js:sourcemap:103
at Array.map ()
at Function.shp.parseZip (shp.js:sourcemap:92)
at shp.js:sourcemap:140
at tryToUnwrap (shp.js:sourcemap:3000)
blob:http://leaflet.calvinmetcalf.com/40feeb75-ebed-4a72-9e49-67f0c8707e95:15 shit

How can I dig into this error tracking down what I've done wrong in the shapefile? Or what alternate steps should I use when I have an issue like this to track it. I guess I could try parsing the shapefile component files...

Thanks!
Rotor.zip

[calvinmetcalf]

so that looks to be an issue with the shapefile, you could try forking this repo and substituting your file for the demo one, but instead of pointing to the zipped version put all the varius files and point to them minus the extention

[paultobey]

Thanks Calvin, Yes, I believe it's unique to this shapefile, but it's a professionally-produced survey and it works with the desktop ThinkGeo library (I attached the shapefile ZIP to my message). There's no "debug" switch I can throw to dump detailed information from leaflet.shapefile? Just being a lazy developer...

[paultobey]

Best guess is that there's an uneven number of rows in the shape file. Should we adjust the code to exit the loop when there are less than 28 bytes left? Increase error checking in getRow()?

ParseShp.prototype.getRows = function() {
var offset = 100;
var len = this.buffer.byteLength;
var out = [];
var current;
while (offset < len) {
/* The error is here in this.parseFunc(offset):
shp.js:293 In ParseShp.prototype.getRows, exception RangeError: Trying to access beyond buffer length
at checkOffset (shp.js:1551)
at Uint8Array.readDoubleLE (shp.js:1701)
at ParseShp.2.exports.ParseShp.trans.buffer [as parseCoord] (shp.js:234)
at ParseShp.2.ParseShp.parsePoint (shp.js:61)
at ParseShp.2.ParseShp.getRows (shp.js:288)
at new ParseShp (shp.js:245)
at 2.module.exports (shp.js:312)
at shp.js:22373
at Array.map ()
at Function.58.shp.parseZip (shp.js:22359)
*/
current = this.getRow(offset);
offset += 8;
offset += current.len;
if (current.type) {
try {
let x = this.parseFunc(current.data);
console.warn('In ParseShp.prototype.getRows, parsed point %o', x);
out.push(x);
}
catch (e) {
console.error('In ParseShp.prototype.getRows, exception %o', e)
}
}
}