Fix #33 - detect end-of-file marker 0x1a.

Author: mbostock

README.md

@@ -42,7 +42,8 @@ shp2json example.shp
 
 For a live example, see [bl.ocks.org/2dd741099154a4da55a7db31fd96a892](http://bl.ocks.org/mbostock/2dd741099154a4da55a7db31fd96a892). See also [ndjson-cli](https://github.com/mbostock/ndjson-cli) for examples of manipulating GeoJSON using newline-delimited JSON streams. See [Command-Line Cartography](https://medium.com/@mbostock/command-line-cartography-part-1-897aa8f8ca2c) for a longer introduction.
 
-This parser implementation is based on the [ESRI Shapefile Technical Description](http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf) and [dBASE Table File Format](http://www.digitalpreservation.gov/formats/fdd/fdd000325.shtml). Caveat emptor: this is a work in progress and does not currently support all shapefile geometry types. It only supports dBASE III and has little error checking. Please contribute if you want to help!
+This parser implementation is based on the [ESRI Shapefile Technical Description](http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf), [dBASE Table for ESRI Shapefile (DBF)](http://www.digitalpreservation.gov/formats/fdd/fdd000326.shtml) and [Data File Header Structure for the
+dBASE Version 7 Table File](http://www.dbase.com/Knowledgebase/INT/db7_file_fmt.htm). Caveat emptor: this is a work in progress and does not currently support all shapefile geometry types. It only supports dBASE III and has little error checking. Please contribute if you want to help!
 
 In-browser parsing of dBASE table files requires [TextDecoder](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder#Browser_compatibility), part of the [Encoding living standard](https://encoding.spec.whatwg.org/), which is not supported in IE or Safari as of September, 2016. See [text-encoding](https://github.com/inexorabletash/text-encoding) for a browser polyfill.
 

dbf/read.js

@@ -16,7 +16,7 @@ var types = {
 export default function() {
   var that = this, i = 1;
   return that._source.slice(that._recordLength).then(function(value) {
-    return value ? {done: false, value: that._fields.reduce(function(p, f) {
+    return value && (value[0] !== 0x1a) ? {done: false, value: that._fields.reduce(function(p, f) {
       p[f.name] = types[f.type](that._decode(value.subarray(i, i += f.length)));
       return p;
     }, {})} : {done: true, value: undefined};