Add Base64 parity APIs with Base64Url#123151

Merged

stephentoub merged 25 commits intomainfrom

copilot/add-base64-url-parity

Jan 20, 2026

Commits on Jan 14, 2026

Initial plan

Copilot
authored and
MihaZupan
committed
Add Base64 parity APIs with Base64Url (EncodeToChars, DecodeFromChars, etc.)

authored and
MihaZupan
committed
Add unit tests for Base64 Unicode APIs (EncodeToChars, DecodeFromChars, etc.)

authored and
MihaZupan
committed
Fix code review feedback: documentation wording and test variable names

authored and
MihaZupan
committed
Move Base64 parity APIs from Base64Extensions.cs to Base64Encoder.cs and Base64Decoder.cs; distribute tests

authored and
MihaZupan
committed
Add Debug.Assert statements for expected OperationStatus values in TryDecodeFromChars and DecodeFromChars

authored and
MihaZupan
committed
Remove all #if NET/#endif pairs from Base64Encoder.cs and Base64Decoder.cs

authored and
MihaZupan
committed
Address review feedback: fix tests, share decode helper, fix Debug.Assert typo, remove redundant if/else

Copilot
and
MihaZupan
committed
Add new Base64 APIs to Base64Fuzzer for fuzz testing

Copilot
and
MihaZupan
committed
Share encoder char helpers between Base64Encoder and Base64UrlEncoder

Copilot
and
MihaZupan
committed
Share decoder char helper methods between Base64DecoderChar and Base64UrlDecoderChar

Copilot
and
MihaZupan
committed
Move byte structs to match Base64Url structure and share char encoder helpers

Copilot
and
MihaZupan
committed
Fix .NET Framework build: wrap intrinsics in #if NET and reorder structs

Copilot
and
MihaZupan
committed
Revert Base64Url/Helper files to fix .NET Framework build errors

Copilot
and
MihaZupan
committed
Fix build by implementing char encoder/decoder helpers inline

Copilot
and
MihaZupan
committed
Remove duplicate Base64DecoderByte/EncoderByte from Decoder/Encoder files

Copilot
and
MihaZupan
committed
Avoid code duplication
MihaZupan
committed
Use Base64.EncodeToChars in Convert.ToBase64CharsLargeNoLineBreaks

Copilot
and
stephentoub
committed
Simplify Convert.cs by always using Base64.EncodeToChars for non-line-break cases

Copilot
and
stephentoub
committed
Simplify Convert decoding methods by delegating to Base64.DecodeFromChars

Copilot
and
stephentoub
committed
Simplify Convert.cs encoding methods to delegate to Base64 APIs early

Copilot
and
stephentoub
committed
Restore whitespace-tolerant Convert decoding implementation

Copilot
and
stephentoub
committed

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Add Base64 parity APIs with Base64Url#123151

Add Base64 parity APIs with Base64Url#123151
stephentoub merged 25 commits intomainfrom
copilot/add-base64-url-parity

Commits on Jan 14, 2026

Initial plan

Add Base64 parity APIs with Base64Url (EncodeToChars, DecodeFromChars, etc.)

Add unit tests for Base64 Unicode APIs (EncodeToChars, DecodeFromChars, etc.)

Fix code review feedback: documentation wording and test variable names

Move Base64 parity APIs from Base64Extensions.cs to Base64Encoder.cs and Base64Decoder.cs; distribute tests

Add Debug.Assert statements for expected OperationStatus values in TryDecodeFromChars and DecodeFromChars

Remove all #if NET/#endif pairs from Base64Encoder.cs and Base64Decoder.cs

Address review feedback: fix tests, share decode helper, fix Debug.Assert typo, remove redundant if/else

Add new Base64 APIs to Base64Fuzzer for fuzz testing

Share encoder char helpers between Base64Encoder and Base64UrlEncoder

Share decoder char helper methods between Base64DecoderChar and Base64UrlDecoderChar

Move byte structs to match Base64Url structure and share char encoder helpers

Fix .NET Framework build: wrap intrinsics in #if NET and reorder structs

Revert Base64Url/Helper files to fix .NET Framework build errors

Fix build by implementing char encoder/decoder helpers inline

Remove duplicate Base64DecoderByte/EncoderByte from Decoder/Encoder files

Avoid code duplication

Use Base64.EncodeToChars in Convert.ToBase64CharsLargeNoLineBreaks

Simplify Convert.cs by always using Base64.EncodeToChars for non-line-break cases

Simplify Convert decoding methods by delegating to Base64.DecodeFromChars

Simplify Convert.cs encoding methods to delegate to Base64 APIs early

Restore whitespace-tolerant Convert decoding implementation

Commits on Jan 16, 2026

Merge branch 'main' into copilot/add-base64-url-parity

Simplify Convert decoding by delegating to Base64.DecodeFromChars with whitespace support

Fix review comments: add [Fact], set bytesWritten=0 on failure, simplify DecodeFromChars call