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decode.js
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decode.js
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var getNormals = require('polyline-normals')
var varint = require('varint')
var getLoops = require('./lib/get-loops.js')
module.exports = function (buffers) {
var sizes = {
point: { types: 0, ids: 0, positions: 0 },
line: { types: 0, ids: 0, positions: 0, normals: 0 },
area: { types: 0, ids: 0, positions: 0, cells: 0 },
areaBorder: { types: 0, ids: 0, positions: 0, normals: 0 },
}
for (var bufi = 0; bufi < buffers.length; bufi++) {
var buf = buffers[bufi]
if (buf.length === 0) return
var featureType = buf.readUInt8(0)
var offset = 1
if (featureType === 1) {
sizes.point.types++
sizes.point.ids+=2
sizes.point.positions+=2
}
else if (featureType === 2) {
varint.decode(buf, offset) //types
offset+=varint.decode.bytes
varint.decode(buf, offset) //id
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset) //pcount
offset+=varint.decode.bytes
sizes.line.types+=plen*2+3
sizes.line.ids+=plen*2+3
sizes.line.positions+=plen*4+6
sizes.line.normals+=plen*4+6
}
else if (featureType === 3) {
varint.decode(buf, offset) //types
offset+=varint.decode.bytes
varint.decode(buf, offset) //id
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset) //pcount
offset+=varint.decode.bytes
offset+=plen*8
sizes.area.types+=plen
sizes.area.ids+=plen*2
sizes.area.positions+=plen*2
sizes.areaBorder.types+=plen*2+2
sizes.areaBorder.ids+=plen*2+2
sizes.areaBorder.positions+=plen*4+4
sizes.areaBorder.normals+=plen*4+4
var clen = varint.decode(buf, offset) //clen
offset+=varint.decode.bytes
sizes.area.cells+=clen*3
}
else if (featureType === 4) {
varint.decode(buf, offset) //types
offset+=varint.decode.bytes
varint.decode(buf, offset) //id
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset) //pcount
offset+=varint.decode.bytes
offset+=plen*8
sizes.area.types+=plen
sizes.area.ids+=plen*2
sizes.area.positions+=plen*2
var clen = varint.decode(buf, offset) //clen
offset+=varint.decode.bytes
sizes.area.cells+=clen*3
for (var i=0; i<clen*3; i++) {
var c = varint.decode(buf, offset)
offset+=varint.decode.bytes
}
var elen = varint.decode(buf, offset) //elen
offset+=varint.decode.bytes
var epl = 0, esize = 0, eprev = 0
for (var i=0; i<elen; i++) {
var e = varint.decode(buf, offset)
offset+=varint.decode.bytes
if (e === 0) { // edge break
if (epl >= 2) {
esize += epl*2 + 2
}
epl = 0
} else if (e % 2 === 0) { // edge index
var ei = Math.floor(e/2)-1
epl++
eprev = ei
} else { // edge range
epl += Math.floor(e/2)-eprev-1
eprev = e1
}
}
if (epl >= 2) {
esize += epl*2 + 2
}
sizes.areaBorder.types+=esize
sizes.areaBorder.ids+=esize
sizes.areaBorder.positions+=esize*2
sizes.areaBorder.normals+=esize*2
}
}
var data = {
point: {
types: new Float32Array(sizes.point.types),
ids: Array(sizes.point.ids).fill(0),
positions: new Float32Array(sizes.point.positions),
labels: {}
},
line: {
types: new Float32Array(sizes.line.types),
ids: Array(sizes.line.ids).fill(0),
positions: new Float32Array(sizes.line.positions),
normals: new Float32Array(sizes.line.normals),
labels: {}
},
area: {
types: new Float32Array(sizes.area.types),
ids: Array(sizes.area.ids).fill(0),
positions: new Float32Array(sizes.area.positions),
cells: new Uint32Array(sizes.area.cells),
labels: {}
},
areaBorder: {
types: new Float32Array(sizes.areaBorder.types),
ids: Array(sizes.areaBorder.ids).fill(0),
positions: new Float32Array(sizes.areaBorder.positions),
normals: new Float32Array(sizes.areaBorder.normals)
},
}
var offsets = {
point: { types: 0, ids: 0, positions: 0, labels: 0 },
line: { types: 0, ids: 0, positions: 0, normals: 0, labels: 0 },
area: { types: 0, ids: 0, positions: 0, cells: 0, labels: 0 },
areaBorder: { types: 0, ids: 0, positions: 0, normals: 0 },
}
var pindex = 0
for (var bufi = 0; bufi < buffers.length; bufi++) {
var buf = buffers[bufi]
if (buf.length === 0) return
var offset = 0
var featureType = buf.readUInt8(offset)
offset+=1
if (featureType === 1) {
data.point.types[offsets.point.types++] = varint.decode(buf, offset)
offset+=varint.decode.bytes
var id = varint.decode(buf, offset)
offset+=varint.decode.bytes
data.point.ids[offsets.point.ids++] = id
data.point.positions[offsets.point.positions++] = buf.readFloatLE(offset)
offset+=4
data.point.positions[offsets.point.positions++] = buf.readFloatLE(offset)
offset+=4
offset = decodeLabels(buf, offset, data.point, id)
}
else if (featureType === 2) {
var type = varint.decode(buf, offset)
offset+=varint.decode.bytes
var id = varint.decode(buf, offset)
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset)
offset+=varint.decode.bytes
var positions = []
var lon, lat
data.line.types[offsets.line.types++] = type
data.line.ids[offsets.line.ids++] = id
for (var i=0; i<plen; i++) {
data.line.types[offsets.line.types++] = type
data.line.types[offsets.line.types++] = type
data.line.ids[offsets.line.ids++] = id
data.line.ids[offsets.line.ids++] = id
lon = buf.readFloatLE(offset)
offset+=4
lat = buf.readFloatLE(offset)
offset+=4
if (i === 0) {
data.line.positions[offsets.line.positions++] = lon
data.line.positions[offsets.line.positions++] = lat
}
data.line.positions[offsets.line.positions++] = lon
data.line.positions[offsets.line.positions++] = lat
data.line.positions[offsets.line.positions++] = lon
data.line.positions[offsets.line.positions++] = lat
positions.push([lon, lat])
}
data.line.types[offsets.line.types++] = type
data.line.ids[offsets.line.ids++] = id
data.line.positions[offsets.line.positions++] = lon
data.line.positions[offsets.line.positions++] = lat
var normals = getNormals(positions)
var scale = Math.sqrt(normals[0][1])
data.line.normals[offsets.line.normals++] = normals[0][0][0]*scale
data.line.normals[offsets.line.normals++] = normals[0][0][1]*scale
for (var i=0; i<normals.length; i++) {
scale = Math.sqrt(normals[i][1])
data.line.normals[offsets.line.normals++] = normals[i][0][0]*scale
data.line.normals[offsets.line.normals++] = normals[i][0][1]*scale
data.line.normals[offsets.line.normals++] = -1*normals[i][0][0]*scale
data.line.normals[offsets.line.normals++] = -1*normals[i][0][1]*scale
}
var normOffset = offsets.line.normals
data.line.normals[offsets.line.normals++] = data.line.normals[normOffset-2]
data.line.normals[offsets.line.normals++] = data.line.normals[normOffset-1]
offset = decodeLabels(buf, offset, data.line, id)
}
else if (featureType === 3) {
var type = varint.decode(buf, offset)
offset+=varint.decode.bytes
var id = varint.decode(buf, offset)
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset)
offset+=varint.decode.bytes
var positions = []
var lon, lat
for (var i=0; i<plen; i++) {
lon = buf.readFloatLE(offset)
offset+=4
lat = buf.readFloatLE(offset)
data.area.types[offsets.area.types++] = type
data.area.ids[offsets.area.ids++] = id
data.area.positions[offsets.area.positions++] = lon
data.area.positions[offsets.area.positions++] = lat
offset+=4
positions.push([lon, lat])
}
var clen = varint.decode(buf, offset)
offset+=varint.decode.bytes
var cells = []
for (var i=0; i<clen; i++) {
var c0 = varint.decode(buf, offset)
data.area.cells[offsets.area.cells++] = c0 + pindex
cells.push(c0)
offset+=varint.decode.bytes
var c1 = varint.decode(buf, offset)
data.area.cells[offsets.area.cells++] = c1 + pindex
cells.push(c1)
offset+=varint.decode.bytes
var c2 = varint.decode(buf, offset)
data.area.cells[offsets.area.cells++] = c2 + pindex
cells.push(c2)
offset+=varint.decode.bytes
}
var loops = getLoops(cells, positions)
for (var i=0; i <loops.length; i++) {
addAreaBorderPositions(data, offsets, loops[i], id, type, false)
}
pindex+=plen
offset = decodeLabels(buf, offset, data.area, id)
}
else if (featureType === 4) {
var type = varint.decode(buf, offset)
offset+=varint.decode.bytes
var id = varint.decode(buf, offset)
offset+=varint.decode.bytes
var plen = varint.decode(buf, offset)
offset+=varint.decode.bytes
var pstart = offsets.area.positions
var lon, lat
for (var i=0; i<plen; i++) {
lon = buf.readFloatLE(offset)
offset+=4
lat = buf.readFloatLE(offset)
offset+=4
data.area.types[offsets.area.types++] = type
data.area.ids[offsets.area.ids++] = id
data.area.positions[offsets.area.positions++] = lon
data.area.positions[offsets.area.positions++] = lat
}
var clen = varint.decode(buf, offset)
offset+=varint.decode.bytes
for (var i=0; i<clen*3; i++) {
var c = varint.decode(buf, offset)
data.area.cells[offsets.area.cells++] = c + pindex
offset+=varint.decode.bytes
}
var elen = varint.decode(buf, offset)
offset+=varint.decode.bytes
var positions = [], eprev = 0
for (var i=0; i<elen; i++) {
var e = varint.decode(buf, offset)
offset+=varint.decode.bytes
if (e === 0) { // edge break
addAreaBorderPositions(data, offsets, positions, id, type, false)
positions = []
} else if (e % 2 === 0) { // edge index
var ei = Math.floor(e/2)-1
positions.push([
data.area.positions[pstart+ei*2+0],
data.area.positions[pstart+ei*2+1]
])
eprev = ei
} else { // edge range
var e0 = eprev+1
var e1 = Math.floor(e/2)-1
for (var ex = e0; ex <= e1; ex++) {
positions.push([
data.area.positions[pstart+ex*2+0],
data.area.positions[pstart+ex*2+1]
])
}
eprev = e1
}
}
addAreaBorderPositions(data, offsets, positions, id, type, false)
pindex+=plen
offset = decodeLabels(buf, offset, data.area, id)
}
}
if (offsets.areaBorder.types !== data.areaBorder.types.length) {
data.areaBorder.types = data.areaBorder.types.subarray(0, offsets.areaBorder.types)
data.areaBorder.positions = data.areaBorder.positions.subarray(0, offsets.areaBorder.positions)
data.areaBorder.normals = data.areaBorder.normals.subarray(0, offsets.areaBorder.normals)
}
return data
}
function decodeLabels (buf, offset, data, id) {
do {
var labelLength = varint.decode(buf, offset)
if (labelLength === 0) continue
offset+=varint.decode.bytes
var labelData = buf.slice(offset, offset+labelLength)
offset+=labelLength
if (!data.labels[id]) data.labels[id] = []
data.labels[id].push(labelData.toString())
} while (labelLength > 0)
return offset
}
function addAreaBorderPositions(data, offsets, positions, id, type, closed) {
if (positions.length < 2) return
var positionsCount = 2+6+(4*positions.length)
var ex = 1.5
if (offsets.areaBorder.positions + positions.length + positionsCount >= data.areaBorder.positions.length) {
var ndataTypes = new Float32Array(data.areaBorder.types.length*ex)
for (var k=0; k<data.areaBorder.types.length; k++) {
ndataTypes[k] = data.areaBorder.types[k]
}
data.areaBorder.types = ndataTypes
var ndataPos = new Float32Array(data.areaBorder.positions.length*ex)
for (var k=0; k<data.areaBorder.positions.length; k++) {
ndataPos[k] = data.areaBorder.positions[k]
}
data.areaBorder.positions = ndataPos
var ndataNorms = new Float32Array(data.areaBorder.normals.length*ex)
for (var k=0; k<data.areaBorder.normals.length; k++) {
ndataNorms[k] = data.areaBorder.normals[k]
}
data.areaBorder.normals = ndataNorms
}
var normals = getNormals(positions, closed)
var scale = Math.sqrt(normals[0][1])
data.areaBorder.ids[offsets.areaBorder.ids++] = id
data.areaBorder.types[offsets.areaBorder.types++] = type
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[0][0]
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[0][1]
data.areaBorder.normals[offsets.areaBorder.normals++] = normals[0][0][0]*scale
data.areaBorder.normals[offsets.areaBorder.normals++] = normals[0][0][1]*scale
for (var j = 0; j < positions.length; j++) {
scale = Math.sqrt(normals[j][1])
data.areaBorder.ids[offsets.areaBorder.ids++] = id
data.areaBorder.ids[offsets.areaBorder.ids++] = id
data.areaBorder.types[offsets.areaBorder.types++] = type
data.areaBorder.types[offsets.areaBorder.types++] = type
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j][0]
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j][1]
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j][0]
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j][1]
data.areaBorder.normals[offsets.areaBorder.normals++] = normals[j][0][0]*scale
data.areaBorder.normals[offsets.areaBorder.normals++] = normals[j][0][1]*scale
data.areaBorder.normals[offsets.areaBorder.normals++] = -normals[j][0][0]*scale
data.areaBorder.normals[offsets.areaBorder.normals++] = -normals[j][0][1]*scale
}
data.areaBorder.ids[offsets.areaBorder.ids++] = id
data.areaBorder.types[offsets.areaBorder.types++] = type
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j-1][0]
data.areaBorder.positions[offsets.areaBorder.positions++] = positions[j-1][1]
data.areaBorder.normals[offsets.areaBorder.normals++] = -normals[j-1][0][0]*scale
data.areaBorder.normals[offsets.areaBorder.normals++] = -normals[j-1][0][1]*scale
}