<head> <base> <script src="https://fastly.jsdelivr.net/npm/marked@3.0.7/marked.min.js"></script> <script> function absFile(url) { this.name=url; this.slice = async(offset, length) =>{ let resp = new Promise(function (resolve, reject) { let r=new XMLHttpRequest; r.onload=function(){ if (r.status == 200) resolve(r.response); else reject(r.statusText); } r.onerror = () => reject(r.statusText); r.open("GET",this.name,!0); r.setRequestHeader('range', 'bytes=' + offset + '-' + ( offset + length -1).toString()); r.send(null);}); return await resp.arrayBuffer(); } } marked.setOptions({ gfm: true, }); var file; var blocksize = 20480; function loadSlice(){ function render(u8array){ document.body.innerHTML = marked(new TextDecoder().decode(u8array)); scroll(0,0); } function setPageUrl(pageurl){ let a = document.createElement('a'); a.href = "i:5c"+pageurl; a.click(); } var page = 1; var extrasize = blocksize; //extrasize should <= blocksize let lhash = location.hash; if(lhash){ if("p"!==lhash.charAt(1)){//#offset=&[len] let iAmpersand = lhash.indexOf('&',8); let offset = parseInt(lhash.substring(8,iAmpersand)); let len = parseInt(lhash.substring(iAmpersand+1)); {//update urlInc() url let href = location.href; let iHash = href.indexOf('#'); href=href.substring(0,iHash)+"#page="+Math.floor((offset+len)/blocksize); setPageUrl(href); } file.slice(offset,len).then((buffer)=>{ let u8 = new Uint8Array(buffer); render(u8); }); return; } //#page= page = parseInt(lhash.substring(6)); }else setPageUrl(location.href+"#page=1"); file.slice(blocksize*(page-1),blocksize+extrasize).then((buffer)=>{ let u8 = new Uint8Array(buffer); let u8len = u8.length; let iStart = 0; let limit = Math.min(u8len,extrasize); if(1!=page){ for(let i=1;i<limit;i=i+2){ if(10==u8[i] && 10==u8[i-1]) { iStart = i+1; break; } } } let iEnd = Math.min(u8len,blocksize); limit = Math.min(u8len,blocksize+extrasize); for(let i=blocksize+1;i<limit;i=i+2){ if(10==u8[i] && 10==u8[i-1]) { iEnd = i+1; break; } } render(u8.slice(iStart,iEnd)); }); } //#offset=&[len]&page= { let url = location.href; file = new absFile(url); } window.addEventListener('hashchange',loadSlice); </script> </head> <body> <script>loadSlice();</script> </body>