Problem with the encoding of Cyrillic characters

There are problems with the encoding of Cyrillic characters in some files. The sample file I uploaded to google drive: file xls. This file opens correctly in Excel 16.0. The result of the conversion to csv from the page http://oss.sheetjs.com/js-xlsx/

Îñòàòêè ÒÌÖ íà ñêëàäàõ,,,,,,,,,,,,,,,,,,,,,,,,,,
Íà äàòó: 04.12.17,,,,,,,,,,,,,,,,,,,,,,,,,,
"Ïî íîìåíêëàòóðíûì ïîçèöèÿì èç ñïèñêà (""Àâòîøèíû"").",,,,,,,,,,,,,,,,,,,,,,,,,,
Íîìåíêëàòóðà,,,Åä.,Ñêëàä ã. ×åëÿáèíñê,,Ñëîáîäñêîé ïåð. 45,,,,,,,,,,,,,,,,,,,,
,,,,öåíà À,Ñâîáîäíûé,öåíà À,Ñâîáîäíûé,,,,,,,,,,,,,,,,,,,
51344,-----,16.5/70-18 TT ÂØÇ ÊÔ-97 íñ10 ñ îá.ëåíòîé,êîìïë, ,0,"14,008.00",>12,,,,,,,,,,,,,,,,,,,

Can it be fixed by some manipulation:

const iconv = require('iconv-lite');
console.log(iconv.decode(iconv.encode('Îñòàòêè ÒÌÖ íà ñêëàäàõ,,,,,,,,,,,,,,,,,,,,,,,,,,', 'cp1252'), 'cp1251'));
//display "Остатки ТМЦ на складах,,,,,,,,,,,,,,,,,,,,,,,,,,"

[SheetJSDev]

@makcbrain thanks for sharing! This is a BIFF5 XLS (Excel 5.0/95) file with no CodePage record, so there’s no way to inspect the file and determine the correct encoding. To see that this is a file ambiguity, try opening this in Excel 2016 for Mac and you’ll see different content corresponding to the default Mac Roman codepage 10000:

That string does correspond to the original set of bytes, as you can verify manually:

var cptable = require('codepage'); 
cptable.utils.decode(1251, cptable.utils.encode(1252, "Îñòàòêè ÒÌÖ íà ñêëàäàõ"));
// 'Остатки ТМЦ на складах'
cptable.utils.decode(1251, cptable.utils.encode(10000, "ŒÒÚ‡ÚÍË “Ã÷ ̇ ÒÍ·‰‡ı"));
// 'Остатки ТМЦ на складах'

Just as discussed in #907 the final solution will involve adding a default codepage option to the read functions (e.g. XLSX.readFile("file.xls", {codepage:1251}))

[SheetJSDev]

pass the codepage option to read or readFile https://github.com/SheetJS/sheetjs/#parsing-options .