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@pps83 pps83 commented Nov 27, 2024

Fixes the following error when building with msvc compiler

test_compress_bound.cc
D:\zlib-ng\test\test_compress_bound.cc(41,50): error C2220: the following warning is treated as an error
D:\zlib-ng\test\test_compress_bound.cc(41,50): warning C4267: 'argument': conversion from 'size_t' to 'unsigned long', possible loss of data
D:\zlib-ng\test\test_compress_bound.cc(43,68): warning C4267: 'argument': conversion from 'size_t' to 'unsigned long', possible loss of data

Summary by CodeRabbit

  • Bug Fixes
    • Improved the accuracy of compression length estimation by adjusting the loop variable type in the compression testing method.

This change enhances the reliability of the compression output verification process.

Fixes the following error when building with msvc compiler
```
test_compress_bound.cc
D:\zlib-ng\test\test_compress_bound.cc(41,50): error C2220: the following warning is treated as an error
D:\zlib-ng\test\test_compress_bound.cc(41,50): warning C4267: 'argument': conversion from 'size_t' to 'unsigned long', possible loss of data
D:\zlib-ng\test\test_compress_bound.cc(43,68): warning C4267: 'argument': conversion from 'size_t' to 'unsigned long', possible loss of data
```
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coderabbitai bot commented Nov 27, 2024

Walkthrough

The changes in this pull request involve modifying the type of a loop variable within the estimate method of the compress_bound_variant class in the test/test_compress_bound.cc file. The loop variable's type is changed from z_size_t to z_uintmax_t, affecting how the loop iterates over the MAX_LENGTH constant. This adjustment influences the calculation of the output length during the compression operation, while the overall logic of the method remains unchanged.

Changes

File Change Summary
test/test_compress_bound.cc Changed loop variable type from z_size_t to z_uintmax_t in the estimate method.

Possibly related PRs

  • Compute the "safe" distance properly #1801: The changes in this PR involve memory operations in the inflate_fast function, which may indirectly relate to compression and decompression processes, but they do not modify the same functions or variables as the main PR's changes in the compress_bound_variant class.

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  • Dead2

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Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (1)
test/test_compress_bound.cc (1)

37-37: LGTM! The change fixes the MSVC warnings, though it might be overengineered.

The switch to z_uintmax_t successfully addresses the MSVC compiler warnings about potential data loss in size_t to unsigned long conversions. While this solution is more than sufficient for the current MAX_LENGTH of 32, it provides good forward compatibility if the test range increases in the future.

A simpler alternative, if you prefer, could be to just cast the values explicitly:

-        for (z_uintmax_t i = 0; i < MAX_LENGTH; i++) {
-            z_uintmax_t dest_len = sizeof(dest);
+        for (z_size_t i = 0; i < MAX_LENGTH; i++) {
+            z_size_t dest_len = sizeof(dest);
+            unsigned long dest_len_ul = (unsigned long)dest_len;  // Explicit cast

However, the current solution is perfectly fine and more future-proof, so this is just a stylistic suggestion.

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Reviewing files that changed from the base of the PR and between 0ed5ac8 and 63a7cbd.

📒 Files selected for processing (1)
  • test/test_compress_bound.cc (1 hunks)

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codecov bot commented Nov 27, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.14%. Comparing base (0ed5ac8) to head (63a7cbd).
Report is 2 commits behind head on develop.

Additional details and impacted files
@@             Coverage Diff             @@
##           develop    #1814      +/-   ##
===========================================
- Coverage    32.18%   32.14%   -0.04%     
===========================================
  Files           67       67              
  Lines         5752     5752              
  Branches      1237     1237              
===========================================
- Hits          1851     1849       -2     
- Misses        3644     3645       +1     
- Partials       257      258       +1     

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LGTM

@Dead2 Dead2 merged commit 7fdc3aa into zlib-ng:develop Dec 1, 2024
142 of 150 checks passed
@pps83 pps83 deleted the develop-fix-cast branch December 2, 2024 14:23
@Dead2 Dead2 mentioned this pull request Dec 31, 2024
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3 participants