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custom UTF-8 (Uint8Array) to UTF-16 (String) converter that displays …
…error info fixes #4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| 'use strict'; | ||
|
|
||
| //https://encoding.spec.whatwg.org/#utf-8-decoder | ||
|
|
||
| function utf8to16(callback_ok,callback_abort,buf,outstr,i){ | ||
| var l=buf.length,chr=String.fromCharCode,b1,b2,b3,b4,j; | ||
| oof:do{ | ||
| for(;i!==l;++i){ | ||
| if(buf[j=i]<128){ | ||
| if((b1=l-i)>8192)b1=8192; | ||
| while(++i,--b1&&buf[i]<128); | ||
| outstr+=chr.apply(null,buf.subarray(j,i--)); | ||
| continue; | ||
| } | ||
| if((b1=buf[i])<194||b1>244 | ||
| ||++i===l)continue oof; | ||
| b2=buf[i]; | ||
| //b1 is valid start of multi-byte code point | ||
| if(b1<224){ | ||
| //110xxxxx (2 byte code point) | ||
| if(b2<128||b2>191)continue oof; | ||
| outstr+=chr(b2^(b1<<6)^12416); | ||
| continue; | ||
| } | ||
| if(b1<240){ | ||
| //1110xxxx (3 byte code point) | ||
| if(b2<(b1===224?160:128)||b2>(b1===237?159:191) | ||
| ||++i===l | ||
| ||(b3=buf[i])<128||b3>191)continue oof; | ||
| outstr+=chr(b3^(b2<<6)^(b1<<12)^925824); | ||
| continue; | ||
| } | ||
| //11110xxx (4 byte code point) | ||
| if(b2<(b1===240?144:128)||b2>(b1===244?143:191) | ||
| ||++i===l | ||
| ||(b3=buf[i])<128||b3>191 | ||
| ||++i===l | ||
| ||(b4=buf[i])<128||b4>191)continue oof; | ||
| outstr+=chr( | ||
| (b3>>4)+(b2<<2)+(b1<<8)-6728, | ||
| b4^((b3&15)<<6)^56448 | ||
| ); | ||
| } | ||
| callback_ok(outstr); | ||
| return; | ||
| }while(!callback_abort&&(i+=i===j,outstr+='\uFFFD')); | ||
|
|
||
| //ask how to handle error | ||
| //don't set tbl.innerHTML because browser adds <tbody> in html mode (non-xhtml) | ||
| var tbl=cre('table'),tr=cre('tr'); | ||
| tbl.className='tableborder'; | ||
| tr.innerHTML='<th colspan="2" style="background-color:var(--Bad);">bad UTF-8</th>'; | ||
| tbl.appendChild(tr); | ||
| (tr=cre('tr')).innerHTML='<td>code point offset inside data:</td><td>'+j+'</td>'; | ||
| tbl.appendChild(tr); | ||
| (tr=cre('tr')).innerHTML='<td>error offset inside code point:</td><td>'+(i-j)+'</td>'; | ||
| tbl.appendChild(tr); | ||
| (tr=cre('tr')).innerHTML='<td>data length:</td><td>'+l+'</td>'; | ||
| tbl.appendChild(tr); | ||
| (tr=cre('tr')).innerHTML='<td colspan="2"><input value="abort" data-a="a" type="button"/><input value="replace errors" title="replace errors with U+FFFD like str(data,'utf-8','replace') in python3" data-a="r" type="button"/><a data-a="s" download="bad_utf8.bin" href="javascript:;" class="btn" style="display:inline-block;">save data</a></td>'; | ||
| tr.firstChild.addEventListener('click',function(e){ | ||
| switch((e=e.target).dataset.a){ | ||
| case 'a': | ||
| pop_gui(); | ||
| callback_abort(); | ||
| set_loading(false); | ||
| return; | ||
| case 'r': | ||
| set_loading(true); | ||
| pop_gui(); | ||
| utf8to16(callback_ok,null,buf,outstr+'\uFFFD',i+(i===j)); | ||
| return; | ||
| case 's': | ||
| setTimeout(revoke_href,0,e); | ||
| e.href=URL.createObjectURL(new Blob([buf],binblobopts)); | ||
| } | ||
| },capel); | ||
| tbl.appendChild(tr); | ||
| push_gui(tbl,true); | ||
| set_loading(false); | ||
| } | ||
|
|
||
| function revoke_href(a){ | ||
| URL.revokeObjectURL(a.href); | ||
| a.href='javascript:;'; | ||
| } |