Decode to wrong character

• PHP Version: 8.1.13
• PDFParser Version: 2.5.0

Description:

In my pdf file, there are strings with the character Đ, for example: "Địa chỉ". The characters 'ị' 'a' 'c' 'h' 'ỉ' are encoded with 2 bytes, while the character 'Đ' is encoded with 3 bytes. I learned this through checking the pdf file. However, I don't understand why the character 'Đ' is encoded with 3 bytes. pdfparser didn't detect this and therefore decodes 2 bytes at a time, resulting in incorrect decoding for all the characters.

PDF input

1C23TAZ_0000178321.pdf

Expected output & actual output

Expected output: Địa chỉ

Actual output: non-readable text

Bytes sequence: 01 5c 62 04 cf 00 44 00 03 00 46 00 4b 04 cd
01 5c 62 => can't decode
04 cf => ị
00 44 => a
00 03 => space
00 46 => c
00 4b => h
04 cd => ỉ

Code

$parser = new Parser();
$document = $parser->parseFile($file);
$data = $document->getText();

Start at Parser::parseFile and reproduce the decoding failure with the provided 1C23TAZ_0000178321.pdf file and the example code. Trace how the byte sequence for “Địa chỉ” is decoded, then verify that document->getText() returns the expected readable text without breaking the other characters.