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Expose more methods in js library

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Brandon Liu
2021-12-29 12:36:21 +08:00
parent 36b982c553
commit 7e438bbbae
1 changed files with 13 additions and 2 deletions
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15
js/index.src.mjs
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@@ -10,7 +10,7 @@ const getUint48 = (dataview, pos) => {
return shift(dataview.getUint32(pos+2,true),16) + dataview.getUint16(pos,true) return shift(dataview.getUint32(pos+2,true),16) + dataview.getUint16(pos,true)
} }
const parseHeader = dataview => { export const parseHeader = dataview => {
var magic = dataview.getUint16(0,true) var magic = dataview.getUint16(0,true)
if (magic !== 19792) { if (magic !== 19792) {
throw new Error('File header does not begin with "PM"') throw new Error('File header does not begin with "PM"')
@@ -21,7 +21,18 @@ const parseHeader = dataview => {
return {version:version,json_size:json_size,root_entries:root_entries} return {version:version,json_size:json_size,root_entries:root_entries}
} }
const bytesToMap = dataview => { export const parseEntry = (dataview,i) => {
var z_raw = dataview.getUint8(i,true)
var z = z_raw & 127
var is_dir = z_raw >> 7
var x = getUint24(dataview,i+1)
var y = getUint24(dataview,i+4)
var offset = getUint48(dataview,i+7)
var length = dataview.getUint32(i+13,true)
return [z,x,y,offset,length,is_dir]
}
export const bytesToMap = dataview => {
let m = new Map() let m = new Map()
for (var i = 0; i < dataview.byteLength; i+=17) { for (var i = 0; i < dataview.byteLength; i+=17) {
var z_raw = dataview.getUint8(i,true) var z_raw = dataview.getUint8(i,true)