lz4_compression: Make use of std::span

Allows making the incoming data stream non-allocating.

src/common/lz4_compression.cpp

@@ -59,8 +59,7 @@ std::vector<u8> CompressDataLZ4HCMax(const u8* source, std::size_t source_size)
     return CompressDataLZ4HC(source, source_size, LZ4HC_CLEVEL_MAX);
 }
 
-std::vector<u8> DecompressDataLZ4(const std::vector<u8>& compressed,
-                                  std::size_t uncompressed_size) {
+std::vector<u8> DecompressDataLZ4(std::span<const u8> compressed, std::size_t uncompressed_size) {
     std::vector<u8> uncompressed(uncompressed_size);
     const int size_check = LZ4_decompress_safe(reinterpret_cast<const char*>(compressed.data()),
                                                reinterpret_cast<char*>(uncompressed.data()),

src/common/lz4_compression.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <span>
 #include <vector>
 
 #include "common/common_types.h"
@@ -53,7 +54,7 @@ namespace Common::Compression {
  *
  * @return the decompressed data.
  */
-[[nodiscard]] std::vector<u8> DecompressDataLZ4(const std::vector<u8>& compressed,
+[[nodiscard]] std::vector<u8> DecompressDataLZ4(std::span<const u8> compressed,
                                                 std::size_t uncompressed_size);
 
-} // namespace Common::Compression
+} // namespace Common::Compression