fix(708): Support Korean EUC-KR encoding in CEA-708 decoder

[cfsmp3]

Summary

Korean broadcasts use EUC-KR encoding (variable-width) in CEA-708 captions, where ASCII is 1 byte and Korean characters are 2 bytes. The decoder was always writing 2 bytes per character (UTF-16BE style), causing NULL bytes (0x00) to be inserted before every ASCII character (spaces, punctuation).

Changes

• Add is_utf16_charset() function to detect fixed-width 16-bit encodings (UTF-16BE, UCS-2)
• Modify write_char() to accept use_utf16 flag:
  • true: Always 2 bytes (UTF-16BE for Japanese/Chinese, maintains fix for [BUG] A mix of 8-bit/16-bit chars sent to iconv #1451)
  • false: 1 byte for ASCII, 2 bytes for extended chars (EUC-KR for Korean)
• Detect charset type in write_row() before building output buffer

Before fix

     그래 ,  계집  때문이었더냐 .   # Extra spaces from NULL bytes

After fix

     그래, 계집 때문이었더냐.        # Clean Korean text

Test plan

• Tested with Korean MBC sample (mbc.ts) - drama dialog extracted correctly
• Tested with Korean KBS sample (0623_215529_CH9-1_KBS.mpg) - news broadcast extracted correctly
• All 301 Rust unit tests pass
• No NULL bytes in output with --service "1[EUC-KR]"
• Backward compatible: raw output (no charset) still works without NULL bytes

Closes #1065

🤖 Generated with Claude Code

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit 6503502...:

Report Name	Tests Passed
Broken	11/13
CEA-708	13/14
DVB	7/7
DVD	3/3
DVR-MS	2/2
General	21/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	74/86
Teletext	21/21
WTV	12/13
XDS	29/34

NOTE: The following tests have been failing on the master branch as well as the PR:

• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b..., Last passed:

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• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 88cd42b89a..., Last passed:

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Congratulations: Merging this PR would fix the following tests:

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All tests passing on the master branch were passed completely.

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit 6503502...:

Report Name	Tests Passed
Broken	13/13
CEA-708	13/14
DVB	6/7
DVD	3/3
DVR-MS	2/2
General	22/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	75/86
Teletext	21/21
WTV	13/13
XDS	33/34

Your PR breaks these cases:

• ccextractor --service 1 --out=txt --no-bom --no-rollup ea83ff7bcb...
• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2...
• ccextractor --autoprogram --out=ttxt --latin1 1974a299f0...
• ccextractor --autoprogram --out=srt --latin1 b22260d065...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 7aad20907e...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65...
• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b...
• ccextractor --out=txt c83f765c66...
• ccextractor --goptime c83f765c66...
• ccextractor --unixts 5 --out=txt c83f765c66...
• ccextractor --out=txt --datets c83f765c66...
• ccextractor --out=txt --sects c83f765c66...
• ccextractor --out=txt --lf c83f765c66...
• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsnotafter 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --autoprogram --out=srt --latin1 --ucla b22260d065...

Congratulations: Merging this PR would fix the following tests:

• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b..., Last passed: Never
• ccextractor --out=srt --latin1 611b4a9235..., Last passed: Never
• ccextractor --service 1 --out=txt --no-bom --no-rollup b5d6aad89f..., Last passed: Never
• ccextractor --service 1[EUC-KR] --out=txt --no-rollup b5d6aad89f..., Last passed: Never
• ccextractor --service 1[EUC-KR] b5d6aad89f..., Last passed: Never
• ccextractor --service 1[EUC-KR] --no-rollup b5d6aad89f..., Last passed: Never
• ccextractor --service all[EUC-KR] b5d6aad89f..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 132d7df7e9..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 99e5eaafdc..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 70000200c0..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 15feae9133..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 95dd33c6f1..., Last passed: Never
• ccextractor --hardsubx 1a0302f7fd..., Last passed: Never
• ccextractor --out=dvdraw c83f765c66..., Last passed: Never
• ccextractor --in=bin 988d4e8bba..., Last passed: Never
• ccextractor --endcreditstext "CCextractor Ends crdit Testing" addf5e2fc9..., Last passed: Never
• ccextractor --endcreditsforatleast 3 --endcreditstext "CCextractor Ends crdit Testing" addf5e2fc9..., Last passed: Never
• ccextractor --endcreditsforatmost 2 --endcreditstext "CCextractor Ends crdit Testing" addf5e2fc9..., Last passed: Never
• ccextractor --out=srt --latin1 d7e7dbdf68..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla e274a73653..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds b22260d065..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 27fab4dbb6..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds bbd5bb52fc..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds b992e0cccb..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds d0291cdcf6..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 7d2730d38e..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 88cd42b89a..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.