feat: add support for "GBK-EUC-H"

[kvii]

Raw file part:

14 0 obj
<< /Annots [ 6 0 R ] /Contents [ 18 0 R 19 0 R 20 0 R ] /CropBox [ 0 561.26 595.276 841.89 ] /MediaBox [ 0 0 595.276 841.89 ] /Parent 8 0 R /Resources << /Font << /KSPF1 21 0 R /KSPF14 22 0 R /KSPF15 23 0 R /KSPF2 24 0 R /KSPF3 25 0 R /KSPF31 26 0 R /KSPF4 27 0 R /KSPF5 28 0 R /KSPF6 29 0 R /KSPF7 30 0 R >> /XObject << /KSPX16 31 0 R /Xi0 32 0 R /Xi1 33 0 R /Xi10 34 0 R /Xi11 35 0 R /Xi12 36 0 R /Xi13 37 0 R /Xi14 38 0 R /Xi15 39 0 R /Xi16 40 0 R /Xi17 41 0 R /Xi18 42 0 R /Xi19 43 0 R /Xi2 44 0 R /Xi20 45 0 R /Xi21 46 0 R /Xi3 47 0 R /Xi4 48 0 R /Xi5 49 0 R /Xi6 50 0 R /Xi7 51 0 R /Xi8 52 0 R /Xi9 53 0 R >> >> /Type /Page >>
endobj

19 0 obj
<< /Length 5147 >>
stream
q
BT
/KSPF5 14.00 Tf
2 Tr
0.400 w
1 0 0 1 259.171814 805.561462  Tm
0 0 0 rg
0 0 0 RG
[<cda8d3c3>] TJ
ET

% ...
Q

endstream
endobj

28 0 obj
<< /BaseFont /SimSun /DescendantFonts [ 61 0 R ] /Encoding /GBK-EUC-H /Subtype /Type0 /Type /Font >>
endobj

61 0 obj
<< /BaseFont /SimSun /CIDSystemInfo << /Ordering (GB1) /Registry (Adobe) /Supplement 2 >> /FontDescriptor 69 0 R /Subtype /CIDFontType2 /Type /Font /W [ 7716 7716 500 814 907 500 ] >>
endobj