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Add back stripped tags like Geometry lengths, dimensions and precision that are used by Golang Geobuf Library. #1

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Add back stripped tags like Geometry lengths, dimensions and precision that are used by Golang Geobuf Library. #1

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18 changes: 18 additions & 0 deletions bin/json2geobufb64
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
#!/usr/bin/env node

var encode = require('../encode'),
Pbf = require('pbf'),
fs = require('fs'),
concat = require('concat-stream');

var input = process.stdin.isTTY ? fs.createReadStream(process.argv[2]) : process.stdin;

input.pipe(concat(function(buf) {
var geojson = JSON.parse(buf.toString());

var pbf = encode(geojson, new Pbf());
var buffer = Buffer.allocUnsafe ? Buffer.from(pbf) : new Buffer(pbf);
var test = buffer.toString("base64");

process.stdout.write(test);
}));
26 changes: 12 additions & 14 deletions encode.js
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,8 @@ function encode(obj, pbf) {
var precision = Math.ceil(Math.log(e) / Math.LN10);

for (var i = 0; i < keysArr.length; i++) pbf.writeStringField(1, keysArr[i]);
if (dim !== 2) pbf.writeVarintField(2, dim);
if (precision !== 6) pbf.writeVarintField(3, precision);
pbf.writeVarintField(2, dim);
pbf.writeVarintField(3, precision);

if (obj.type === 'FeatureCollection') pbf.writeMessage(4, writeFeatureCollection, obj);
else if (obj.type === 'Feature') pbf.writeMessage(5, writeFeature, obj);
Expand Down Expand Up @@ -172,12 +172,12 @@ function writeLine(line, pbf) {
function writeMultiLine(lines, pbf, closed) {
var len = lines.length,
i;
if (len !== 1) {
var lengths = [];
for (i = 0; i < len; i++) lengths.push(lines[i].length - (closed ? 1 : 0));
pbf.writePackedVarint(2, lengths);
// TODO faster with custom writeMessage?
var lengths = [];
for (i = 0; i < len; i++) {
lengths.push(lines[i].length - (closed ? 1 : 0));
}
pbf.writePackedVarint(2, lengths);

var coords = [];
for (i = 0; i < len; i++) populateLine(coords, lines[i], closed);
pbf.writePackedSVarint(3, coords);
Expand All @@ -186,14 +186,12 @@ function writeMultiLine(lines, pbf, closed) {
function writeMultiPolygon(polygons, pbf) {
var len = polygons.length,
i, j;
if (len !== 1 || polygons[0].length !== 1) {
var lengths = [len];
for (i = 0; i < len; i++) {
lengths.push(polygons[i].length);
for (j = 0; j < polygons[i].length; j++) lengths.push(polygons[i][j].length - 1);
}
pbf.writePackedVarint(2, lengths);
var lengths = [len];
for (i = 0; i < len; i++) {
lengths.push(polygons[i].length);
for (j = 0; j < polygons[i].length; j++) lengths.push(polygons[i][j].length - 1);
}
pbf.writePackedVarint(2, lengths);

var coords = [];
for (i = 0; i < len; i++) {
Expand Down
3 changes: 2 additions & 1 deletion package.json
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Expand Up @@ -6,7 +6,8 @@
"bin": {
"geobuf2json": "bin/geobuf2json",
"json2geobuf": "bin/json2geobuf",
"shp2geobuf": "bin/shp2geobuf"
"shp2geobuf": "bin/shp2geobuf",
"json2geobufb64": "bin/json2geobufb64"
},
"scripts": {
"pretest": "eslint *.js test/*.js",
Expand Down