[llvm] [SYCL][LLVM] Adding property set I/O library for SYCL (PR #110771)

[Tom Honermann via llvm-commits]

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@@ -56,6 +56,32 @@ template <class InputBytes> std::string encodeBase64(InputBytes const &Bytes) {
 
 llvm::Error decodeBase64(llvm::StringRef Input, std::vector<char> &Output);
 
+// General-purpose Base64 encoder/decoder class wrapper.
+class Base64 {
+public:
+  using byte = std::byte;
+
+  // Get the size of the encoded byte sequence of given size.
+  static size_t getEncodedSize(size_t SrcSize);
+
+  // Encode a byte sequence of given size into an output stream.
+  // Returns the number of bytes in the encoded result.
+  static size_t encode(const byte *Src, raw_ostream &Out, size_t SrcSize);
+
+  // Get the size of the encoded byte sequence of given size.
+  static size_t getDecodedSize(size_t SrcSize);
+
+  // Decode a sequence of given size into a pre-allocated memory.
+  // Returns the number of bytes in the decoded result or 0 in case of error.
+  static Expected<size_t> decode(const char *Src, byte *Dst, size_t SrcSize);
+
+  // Allocate minimum required amount of memory and decode a sequence of given
+  // size into it.
+  // Returns the decoded result. The size can be obtained via getDecodedSize.
+  static Expected<std::unique_ptr<byte[]>> decode(const char *Src,
+                                                  size_t SrcSize);
+};
+
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tahonermann wrote:

This wrapper class doesn't seem necessary and doesn't mesh well with the Base functions that are already present.

https://github.com/llvm/llvm-project/pull/110771