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Merge pull request #15562 from Snuffleupagus/checkHeader-prefix

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Slightly re-factor the version fetching in `PDFDocument.checkHeader`
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Jonas Jenwald 2022-10-11 15:27:41 +02:00 committed by GitHub
commit 21c2d0c7b0
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1 changed files with 7 additions and 7 deletions
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14
src/core/document.js
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@ -900,19 +900,19 @@ class PDFDocument {
} }
stream.moveStart(); stream.moveStart();
// Skip over the "%PDF-" prefix, since it was found above.
stream.skip(PDF_HEADER_SIGNATURE.length);
// Read the PDF format version. // Read the PDF format version.
const MAX_PDF_VERSION_LENGTH = 12;
let version = "", let version = "",
ch; ch;
while ((ch = stream.getByte()) > /* Space = */ 0x20) { while (
if (version.length >= MAX_PDF_VERSION_LENGTH) { (ch = stream.getByte()) > /* Space = */ 0x20 &&
break; version.length < /* MAX_PDF_VERSION_LENGTH = */ 7
} ) {
version += String.fromCharCode(ch); version += String.fromCharCode(ch);
} }
if (!this._version) { if (!this._version) {
// Remove the "%PDF-" prefix. this._version = version;
this._version = version.substring(5);
} }
} }