js-crc32/demo/browser.js

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/*jshint browser:true */
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/*eslint-env browser */
/*global CRC32, console, Uint8Array */
var X = CRC32;
function console_log() { if(typeof console !== 'undefined') console.log.apply(console, [].slice.call(arguments)); }
function lpad(s, len, chr){
var L = len - s.length, C = chr || " ";
if(L <= 0) return s;
return new Array(L+1).join(C) + s;
}
function is_defined(val, keys) {
if(typeof val === "undefined") return false;
return keys.length === 0 || is_defined(val[keys[0]], keys.slice(1));
}
function make_chunk_buf_to_str(BType) {
return function(data) {
var o = "", l = 0, w = 10240, L = data.byteLength/w;
for(; l<L; ++l) o+=String.fromCharCode.apply(null, ((new BType(data.slice(l*w,l*w+w)))));
o+=String.fromCharCode.apply(null, ((new BType(data.slice(l*w)))));
return o;
};
}
var bstrify = make_chunk_buf_to_str(typeof Uint8Array !== 'undefined' ? Uint8Array : Array);
var rABS = typeof FileReader !== 'undefined' && is_defined(FileReader, ['prototype', 'readAsBinaryString']);
var userABS = (document.getElementsByName("userabs")[0]);
if(!rABS) {
userABS.disabled = true;
userABS.checked = false;
}
function process_value(val) {
var output = [];
output[0] = "Signed : " + val;
output[1] = "Unsigned : " + (val>>>0);
output[2] = "Hex value : " + lpad((val>>>0).toString(16),8,'0');
var out = (document.getElementById('out'));
var o = output.join("\n");
if(typeof out.innerText == "undefined") out.textContent = o;
else out.innerText = o;
console_log("output", new Date());
}
var dotxt = (document.getElementById('dotext'));
dotxt.onclick = function() {
var txt=(document.getElementById('rawdata'));
console_log("onload", new Date());
var wb = X.str(txt.value);
process_value(wb);
};
var readcb = function(e) {
console_log("onload", new Date(), rABS, false);
var target = (e.target);
var data = target.result;
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var val = rABS ? X.bstr(data) : X.str(bstrify(data));
process_value(val);
};
var handle_file = function(e) {
rABS = userABS.checked;
var otarget = (e.target);
var files = otarget.files;
var f = files[0];
var reader = new FileReader();
reader.onload = readcb;
if(rABS) (reader).readAsBinaryString(f);
else reader.readAsArrayBuffer(f);
};
var xlf = (document.getElementById('xlf'));
if(xlf.addEventListener) xlf.addEventListener('change', handle_file, false);
var handle_drop = (function(e) {
e.stopPropagation();
e.preventDefault();
rABS = userABS.checked;
if(!e.dataTransfer) return;
var files = e.dataTransfer.files;
var f = files[0];
var reader = new FileReader();
reader.onload = readcb;
if(rABS) (reader).readAsBinaryString(f);
else reader.readAsArrayBuffer(f);
});
var handle_drag = (function (e) {
e.stopPropagation();
e.preventDefault();
if(e.dataTransfer) e.dataTransfer.dropEffect = 'copy';
});
var drop = (document.getElementById('drop'));
if(drop.addEventListener) {
drop.addEventListener('dragenter', handle_drag, false);
drop.addEventListener('dragover', handle_drag, false);
drop.addEventListener('drop', handle_drop, false);
}