The thumbhash bytes will be stored as base64 string so we need a function to decode it.
This code, similarly to the encode function, is based on this article, with slight modifications.
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kamil inka marcin - Commits
- rCOMM0d7e1448bd31: [native] Add C++ function to decode base64
This will be tested together with the next diff.
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Are we doing this so performance is better than it would be in a pure-JS implementation? Given you've already done it I guess we should keep it (assuming you avoided copy-paste), but in the future when we need performant low-level implementations of crypto functionality, I would if it would be easier to bridge to a Rust library than to implement "from scratch" in C++
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Looks good, I am a bit afraid there are too many similarities between this and source code from the article, but you said it's based on the article so assuming it was only an inspiration.
| native/cpp/CommonCpp/Tools/Base64.cpp | ||
|---|---|---|
| 69 ↗ | (On Diff #26296) | I think to use this you should add #include <algorithm> and #include <iterator> |
| 75 ↗ | (On Diff #26296) | in line 69 you used end(encoded_str) - 2, so to make it consistent and more readable I will prefer something like: |
| 120 ↗ | (On Diff #26296) | I think there was some discussion that initialization with curly brackets`{}` is better, but I can not find it right now |
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If this was copy-pasted you should follow the third_party approach we've outlined before and include the LICENSE
| native/cpp/CommonCpp/Tools/Base64.cpp | ||
|---|---|---|
| 120 ↗ | (On Diff #26296) | Here's the snippet I read that encouraged braced initialization as a "best practice":  In practice we use all sorts of initialization in our C++ code, but we did say in our C++ coding standards that we "prefer braced initialization": https://www.notion.so/commapp/C-coding-standards-8c9f22b4b16a41c3a868eb5f537db1de?pvs=4#7de58b7ac3c0402bbae2a4e3b6b6738c |