mirrors/PMTiles
1
0
Fork 0
mirror of https://github.com/protomaps/PMTiles.git synced 2026-02-04 19:01:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

JS decoder checks magic number [#5]

Browse Source
This commit is contained in:
Brandon Liu
2021-05-09 11:18:08 +08:00
parent e5dd54b0a8
commit 05c1ba61b5
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
js/index.mjs
View File

@@ -12,7 +12,9 @@ const getUint48 = (dataview, pos) => {
const parseHeader = dataview => { const parseHeader = dataview => {
var magic = dataview.getUint16(0,true) var magic = dataview.getUint16(0,true)
// assert that the magic number (2 bytes) matches 19792 if (magic !== 19792) {
throw new Error('File header does not begin with "PM"')
}
var version = dataview.getUint16(2,true) var version = dataview.getUint16(2,true)
var json_size = dataview.getUint32(4,true) var json_size = dataview.getUint32(4,true)
var root_entries = dataview.getUint16(8,true) var root_entries = dataview.getUint16(8,true)