Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/platform/wasm/examples/streams/fetch-stream.js @ 16:bd5bb0742cc3

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A "check" target that checks for all venv and host prerequisites
author Franz Glasner <fzglas.hg@dom66.de>
date Wed, 17 Sep 2025 21:11:25 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 "use strict"
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2
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3 import * as mupdf from "mupdf"
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4
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5 class FetchStream {
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6 constructor(url) {
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7 fetch(url)
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8 .then((response) => {
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9 if (!response.ok)
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10 throw new Error("HTTP " + response.status)
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11 return response.arrayBuffer()
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12 })
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13 .then((buffer) => {
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14 this.buffer = new Uint8Array(buffer)
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15 })
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16 }
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17 fileSize() {
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18 if (this.buffer)
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19 return this.buffer.byteLength
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20 return -1 // signal try later
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21 }
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22 read(memory, offset, size, position) {
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23 if (this.buffer) {
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24 size = Math.min(size, this.buffer.byteLength - position)
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25 memory.set(this.buffer.subarray(position, position + size), offset)
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26 return size
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27 }
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28 return -1 // signal try later
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29 }
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30 close() {
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31 this.buffer = null
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32 }
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33 }
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34
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35 var stm = new mupdf.Stream(new FetchStream("https://mupdf.com/docs/mupdf_explored.pdf"))
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36 function loop() {
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37 try {
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38 var doc = mupdf.Document.openDocument(stm, "application/pdf")
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39 var n = doc.countPages()
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40 console.log("Document has " + n + " pages!")
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41 } catch (err) {
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42 if (err === "TRYLATER") {
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43 console.log("Waiting...")
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44 setTimeout(loop, 1000)
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45 } else {
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46 throw err
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47 }
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48 }
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49 }
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50 loop()