About Chinese garbled code with DBF files

[ZJS248]

EDIT: this issue was resolved in 0.18.11. If you are using an older version, update using the "Installation" instructions in the documentation

---

when I try to create a dbf file include Chinese words , it translate the words into underline just like this '__'
Here is the code and result :

const xlsx = require("xlsx");

const json = [
  {
    A1: "2020-01-04",
    A2: "English",
  },
  {
    A1: "2020-01-04",
    A2: "中文",
  },
];

const book = xlsx.utils.book_new();
const sheet = xlsx.utils.json_to_sheet(json);
xlsx.utils.book_append_sheet(book, sheet, "sheet1");
xlsx.writeFile(book, "./test.dbf", {bookType: "dbf"});

A1	A2

1 | 2020-01-04 | English
2 | 2020-01-04 | __

[SheetJSDev]

Thanks for raising the issue!

Attached is a ZIP file containing 4 DBF files for 4 separate encodings. Please open each one in your application and confirm all four display the correct characters.

issue2781.zip

As for the fix, there are two parts:

1. Currently, for the legacy formats, the non-ASCII characters are replaced: https://github.com/SheetJS/sheetjs/blob/master/bits/23_binutils.js#L194

This can be patched as follows:

--- a/bits/23_binutils.js
+++ b/bits/23_binutils.js
@@ -189,13 +189,18 @@ function WriteShift(t/*:number*/, val/*:string|number*/, f/*:?string*/)/*:any*/
                                var cppayload = $cptable.utils.encode(current_ansi, val.charAt(i));
                                this[this.l + i] = cppayload[0];
                        }
+                       size = val.length;
+               } else if(typeof $cptable !== 'undefined') {
+                       var cppayload = $cptable.utils.encode(current_ansi, val);
+                       for(i = 0; i < cppayload.length; ++i) this[this.l + i] = cppayload[i];
+                       size = cppayload.length;
                } else {
                        /*:: if(typeof val !== 'string') throw new Error("unreachable"); */
                        val = val.replace(/[^\x00-\x7F]/g, "_");
                        /*:: if(typeof val !== 'string') throw new Error("unreachable"); */
                        for(i = 0; i != val.length; ++i) this[this.l + i] = (val.charCodeAt(i) & 0xFF);
+                       size = val.length;
                }
-               size = val.length;
        } else if(f === 'hex') {
                for(; i < t; ++i) {
                        /*:: if(typeof val !== "string") throw new Error("unreachable"); */

This won't be the full fix since the DBF writer needs to use the full lengths in the calculation (large Chinese strings will overflow) and this will change how some of the other legacy writers work, but it is enough to verify encoding correctness.

2. After applying the patch, you have to tell the library which encoding you want to use. For example, with Simplified Chinese:

xlsx.writeFile(book, "./test.dbf", {bookType: "dbf", codepage: 936});

The main supported codepages for Chinese characters are:

• 936 (Simplified Chinese GBK)
• 950 (Traditional Chinese Big5)

There are two other codepages with support for the two characters in the example:

• 949 (Korean)
• 932 (Japanese Shift-JIS).

[ZJS248]

Thanks for replying, it works for me now.

[SheetJSDev]

Testing this against the latest version appears to work. Web version https://jsfiddle.net/bg10f526/ automatically generates and downloads test.dbf . The web file is identical to the file generated in NodeJS.
For version 0.18.11, the MD5 of the generated file should be ec756d220aa7e6ce5e7d810406617842