uweb/searchurl/txt/txtview.html

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<head>
<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;
function loadSlice(){
var url;
var page = 1;
var blocksize = 1024;
var extrasize = 1024; //extrasize should <= blocksize
let lhash = location.hash;
if(lhash)
page = parseInt(lhash.substring(6),10);
file.slice(blocksize*(page-1),blocksize+extrasize).then((buffer)=>{
let u8 = new Uint8Array(buffer);
let iStart = 0;
if(1!=page){
for(let i=1;i<extrasize;i=i+2){
if(10==u8[i] && 10==u8[i-1]) {
iStart = i+1;
break;
}
}
}
let iEnd = blocksize;
for(let i=blocksize+1;i<blocksize+extrasize;i=i+2){
if(10==u8[i] && 10==u8[i-1]) {
iEnd = i+1;
break;
}
}
document.body.innerHTML = marked(new TextDecoder().decode(u8.slice(iStart,iEnd)));
});
}
window.addEventListener('hashchange',loadSlice);
//?url=#page=
file = new absFile(location.search.substring(5));
//let viewElement = document.querySelector("#viewer");
loadSlice();
</script>
</head>
<body>
</body>