**[IMPROVEMENT]** Port hex_to_int from C to Rust

[ishwarthecodddr]

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---

Description
This PR ports the hex_to_int utility function from C (src/lib_ccx/utility.c) to Rust (src/rust/lib_ccxr/src/util/hex.rs) as part of the ongoing Rust migration effort.
Changes
Created src/rust/lib_ccxr/src/util/hex.rs with the Rust implementation. Exposed the function via C-FFI in
src/rust/src/libccxr_exports/util.rs
Updated src/lib_ccx/utility.c to use the Rust implementation when DISABLE_RUST is not defined.

Changes :- Created src/rust/lib_ccxr/src/util/hex.rs with the Rust implementation.Exposed the function via C-FFI in src/rust/src/libccxr_exports/util.rs.
Updated :- src/lib_ccx/utility.c to use the Rust implementation when DISABLE_RUST is not defined.

Verification :- Ran cargo test -p lib_ccxr and verified that all tests passed, including the new
test_hex_to_int.

[cfsmp3]

Excellent work on this C-to-Rust port! I've done a deep review and the implementation is correct.

Results

• ✅ ALL CI tests pass on Linux (237/237)
• ✅ Would FIX 1 test that has never passed before (hardsubx sample 184)
• ✅ Faithful port - Rust behavior exactly matches C behavior
• ✅ Good test coverage with unit tests
• ✅ Proper FFI export with extern "C" and #[no_mangle]
• ✅ Correct conditional compilation pattern (#ifndef DISABLE_RUST)
• ✅ Changelog updated

Before Merge

Please rebase on master - the PR has merge conflicts.

Windows Build Failure

The Windows build failure is due to vcpkg infrastructure issues, not your code. This is a known issue affecting multiple PRs.

Once rebased, this is ready to merge!

---

Note: Both the C and Rust versions only handle lowercase hex ('a'-'f'). While uppercase ('A'-'F') support could be a nice enhancement, that would be a separate PR - your port correctly matches the existing C behavior.

[ishwarthecodddr]

Thanks @cfsmp3 for review and i have done the necessary changes , i think now it is ready to merge

[cfsmp3]

Maybe you haven't pushed yet?

…

On Wed, Dec 17, 2025, 07:33 Ishwar ***@***.***> wrote: *ishwarthecodddr* left a comment (CCExtractor/ccextractor#1774) <#1774 (comment)> Thanks @cfsmp3 <https://github.com/cfsmp3> for review and i have done the necessary changes , i think now it is ready to merge — Reply to this email directly, view it on GitHub <#1774 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABNMTWKWCBBH7ZAXKETGU334CD2LFAVCNFSM6AAAAACNRNOL6KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTMNRTHA3DQMZXGM> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[ishwarthecodddr]

@cfsmp3 it's done now.

[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 588ad52...:

Report Name	Tests Passed
Broken	13/13
CEA-708	8/14
DVB	7/7
DVD	3/3
DVR-MS	2/2
General	27/27
Hardsubx	0/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	85/86
Teletext	21/21
WTV	13/13
XDS	34/34

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

• ccextractor --service 1 --out=txt --no-bom --no-rollup ea83ff7bcb..., Last passed:

  Test 6890

• ccextractor --service 1 --out=txt --no-bom --no-rollup b5d6aad89f..., Last passed:

  Test 6890

• ccextractor --service 1[EUC-KR] --out=txt --no-rollup b5d6aad89f..., Last passed:

  Test 6890

• ccextractor --service 1[EUC-KR] b5d6aad89f..., Last passed:

  Test 6890

• ccextractor --service 1[EUC-KR] --no-rollup b5d6aad89f..., Last passed:

  Test 6890

• ccextractor --service all[EUC-KR] b5d6aad89f..., Last passed:

  Test 6890

• ccextractor --hardsubx 1a0302f7fd..., Last passed:

  Test 6880

• ccextractor --in=bin 988d4e8bba..., Last passed:

  Test 6880

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.