Getting Advanced encoding /UniGB-UTF16-H not implemented error for chinese text

[Aswin4070]

Replace this: What happened? What were you trying to achieve?

Environment

Which environment were you using when you encountered the problem?

from pypdf import PdfReader
reader = PdfReader("chinese-text.pdf")

Error:

"Advanced encoding /UniGB-UTF16-H not implemented yet" error continuously for all the lines.

When is looked at the code in her for cmap file in pypdf:
https://github.com/py-pdf/pypdf/blob/main/pypdf/_cmap.py

I see the the particular encoding - "/UniGB-UTF16-H" is not declared in "_predefined_cmap" in the code

Can we add just the encoding type under _predefined_cmap"

UniGB-UTF16-H | ISO/IEC 10646 (Unicode), UTF-16 encoding

or should we create something like this:

elif "UniGB-" in enc:
                encoding = "utf-16-be"

[pubpub-zz]

@Aswin4070 can you share your test document for analysis

[pubpub-zz]

after looking on internet and a few tests I would have more likely proposed to use gb18030:
make a test adding at the end of _prefdefined_cmap:

    "\UniGB−UTF16−H": "gb18030",
    "\UniGB−UTF16−V": "gb18030",

[pubpub-zz]

@Aswin4070
any update ? is it possible to have a copy of the document ?

[Aswin4070]

Hi @pubpub-zz ,

Sorry for the delay.

W020240105322424121296.pdf

You can the pdf from here:
https://www.cpnn.com.cn/news/baogao2023/202401/W020240105322424121296.pdf

[pubpub-zz]

Thx
gb18030 was the good choice but I mistype "" instead of "/"
pr is issued