uweb/searchurl/txt/txtview.html

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<head>
<base>
<script src="https://cdn.jsdelivr.net/npm/marked@3.0.7/marked.min.js"></script>
<script>
function absFile(url) {
this.name=url;
this.slice = async(offset, length) =>{
const headers = new Headers();
headers.append('range', 'bytes=' + offset + '-' + ( offset + length -1).toString());
const opts = {
credentials: 'include',
headers : headers
};
const resp = await fetch( this.name, opts );
return await resp.arrayBuffer();
//alert(JSON.stringify(resp.headers));
//return await resp.text();
}
}
var file;
var blocksize = 1024;
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));
});
}
//?url=#offset=&[len]&page=
{
let url = location.search.substring(5);
file = new absFile(url);
document.getElementsByTagName('base')[0].href=url;
}
window.addEventListener('hashchange',loadSlice);
</script>
</head>
<body>
<script>loadSlice();</script>
</body>