Fix: HBO in CIccCalculatorFunc::ApplySequence()

[ChrisCoxArt]

Fixes #623

Pull Request Checklist

• Have you followed the guidelines in Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you built your Pull Request locally with the Build Instructions?
• Have you added or updated relevant tests?
• Have you added or updated relevant docs?

[xsscx]

Maintainer Review

2026-03-01 01:58:04 UTC

mkdir pr-635
cd pr-635
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git fetch origin pull/635/head:pr-635
git checkout pr-635
cd Build
cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=Debug -Wno-dev -DCMAKE_CXX_FLAGS="-g -fsanitize=address,undefined -fno-sanitize=leak -fno-omit-frame-pointer -Wall" -DENABLE_TOOLS=ON -DENABLE_STATIC_LIBS=ON -DENABLE_SHARED_LIBS=ON Cmake > cmake.log 2>&1
make -j32
wget https://github.com/xsscx/fuzz/raw/refs/heads/master/graphics/icc/hbo-CIccCalculatorFunc-ApplySequence-IccMpeCalc_cpp-Line3715.icc
printf "'RGB '\nicEncodeFloat\n0.5 0.5 0.5\n" | ASAN_OPTIONS=detect_leaks=0,print_scariness=1 Tools/IccApplyNamedCmm/iccApplyNamedCmm /dev/stdin 3 0 hbo-CIccCalculatorFunc-ApplySequence-IccMpeCalc_cpp-Line3715.icc 0

Expected Output

[2026-03-01 01:57:45 UTC] ~/pr-635/iccDEV/Build (pr-635)$ git log --oneline --graph -1
* 82df008 (HEAD -> pr-635, origin/issue-623) Check offsets before calling ApplySequence
[2026-03-01 01:57:48 UTC] ~/pr-635/iccDEV/Build (pr-635)$ printf "'RGB '\nicEncodeFloat\n0.5 0.5 0.5\n" | ASAN_OPTIONS=detect_leaks=0,print_scariness=1 Tools/IccApplyNamedCmm/iccApplyNamedCmm /dev/stdin 3 0 hbo-CIccCalculatorFunc-ApplySequence-IccMpeCalc_cpp-Line3715.icc 0
'XYZ '  ; Data Format
icEncodeFloat   ; Encoding

;Source Data Format: 'RGB '
;Source Data Encoding: icEncodeFloat
;Source data is after semicolon

;Profiles applied
; hbo-CIccCalculatorFunc-ApplySequence-IccMpeCalc_cpp-Line3715.icc

   -1.0000   -1.0000   -1.0000  ;    0.5000    0.5000    0.5000