OpenSign/apps/OpenSignServer/cloud/parsefunction/pdf/customSignPdf/readRefTable.min.js

import SignPdfError from"./SignPdfError.min.js";import xrefToRefMap from"./xrefToRefMap.min.js";const getLastTrailerPosition=e=>{var r=e.lastIndexOf(Buffer.from("trailer","utf8")),r=e.slice(r,e.length-6),e=r.slice(r.lastIndexOf(Buffer.from("startxref","utf8"))+10).toString();return parseInt(e)},getXref=(e,r)=>{let t=e.slice(r);e=t.indexOf(Buffer.from("xref","utf8"));if(-1===e)throw new SignPdfError(`Could not find xref anywhere at or after ${r}.`,SignPdfError.TYPE_PARSE);if(0<e&&""!==t.slice(0,e).toString().replace(/\s*/g,""))throw new SignPdfError(`Expected xref at ${r} but found other content.`,SignPdfError.TYPE_PARSE);r=t.indexOf(Buffer.from("%%EOF","utf8"));if(-1===r)throw new SignPdfError("Expected EOF after xref and trailer but could not find one.",SignPdfError.TYPE_PARSE);if(!(r=(t=(t=(t=t.slice(0,r)).slice(e+4)).slice(t.indexOf("\n")+1)).toString().split("/Size")[1]))throw new SignPdfError("Size not found in xref table.",SignPdfError.TYPE_PARSE);if(null===(r=/^\s*(\d+)/.exec(r)))throw new SignPdfError("Failed to parse size of xref table.",SignPdfError.TYPE_PARSE);var r=parseInt(r[1]),[e,f]=t.toString().split("trailer");let n;null!=f.split("/Prev")[1]&&([,f]=/Prev (\d+)/g.exec(f),n=f);f=xrefToRefMap(e);return{size:r,prev:n,xRefContent:f}},getFullXrefTable=e=>{var r=getLastTrailerPosition(e),t=getXref(e,r);return void 0===t.prev?t.xRefContent:(e=e.slice(0,r),r=getFullXrefTable(e),new Map([...r,...t.xRefContent]))},readRefTable=e=>{e=getFullXrefTable(e);return{startingIndex:0,maxIndex:Math.max(...e.keys()),offsets:e}};export default readRefTable;export{getLastTrailerPosition,getXref,getFullXrefTable};