overleaf/services/clsi/app/lib/pdfjs/FSPdfManager.js

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const { PDFDocument } = require('pdfjs-dist/lib/core/document')
const { LocalPdfManager } = require('pdfjs-dist/lib/core/pdf_manager')
const { MissingDataException } = require('pdfjs-dist/lib/core/core_utils')
const { FSStream } = require('./FSStream')
class FSPdfManager extends LocalPdfManager {
constructor(docId, { fh, size, checkDeadline }) {
const nonEmptyDummyBuffer = Buffer.alloc(1, 0)
super(docId, nonEmptyDummyBuffer)
this.stream = new FSStream(fh, 0, size, null, null, checkDeadline)
this.pdfDocument = new PDFDocument(this, this.stream)
}
async ensure(obj, prop, args) {
try {
const value = obj[prop]
if (typeof value === 'function') {
return value.apply(obj, args)
}
return value
} catch (ex) {
if (!(ex instanceof MissingDataException)) {
throw ex
}
await this.requestRange(ex.begin, ex.end)
return this.ensure(obj, prop, args)
}
}
requestRange(begin, end) {
return this.stream.requestRange(begin, end)
}
requestLoadedStream() {}
onLoadedStream() {}
terminate(reason) {}
}
module.exports = {
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FSPdfManager,
}