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JS decoder checks magic number [#5]

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Brandon Liu
2021-05-09 11:18:08 +08:00
parent e5dd54b0a8
commit 05c1ba61b5
1 changed files with 3 additions and 1 deletions
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4
js/index.mjs
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@@ -12,7 +12,9 @@ const getUint48 = (dataview, pos) => {
const parseHeader = dataview => {
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 json_size = dataview.getUint32(4,true)
var root_entries = dataview.getUint16(8,true)