Fix minor parsing and iteration bugs

[alandefreitas]

• Fix params_iter_impl::decrement() computing incorrect decoded
  key/value sizes when a query parameter's value contains literal =
  characters (e.g. ?a=b=c), causing out-of-bounds reads during
  backward iteration (params_iter_impl::decrement() produces invalid decoded_size values #972)
• Fix decode_view::remove_prefix/remove_suffix asserting n <= size() instead of silently allowing undefined behavior (decode_view::remove_prefix can blow up #973)
• Add test for URL with ? in query string (URL parsing is missing some data #926)

[cppalliance-bot]

An automated preview of the documentation is available at https://978.url.prtest2.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-02-20 17:25:20 UTC

[cppalliance-bot]

GCOVR code coverage report https://978.url.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://978.url.prtest2.cppalliance.org/genhtml/index.html
Coverage Diff Report https://978.url.prtest2.cppalliance.org/diff-report/index.html

Build time: 2026-02-20 17:32:28 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.15%. Comparing base (062fe00) to head (14e21e2).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #978      +/-   ##
===========================================
+ Coverage    99.12%   99.15%   +0.03%     
===========================================
  Files          155      155              
  Lines        10043    10045       +2     
===========================================
+ Hits          9955     9960       +5     
+ Misses          88       85       -3     

Files with missing lines	Coverage Δ
include/boost/url/decode_view.hpp	100.00% <ø> (ø)
include/boost/url/detail/impl/params_iter_impl.hpp	100.00% <100.00%> (+2.41%)	⬆️
src/decode_view.cpp	100.00% <100.00%> (ø)

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