Merge #12886: Introduce Span type and use it instead of FLATDATA

9272d70 Support serializing Span<unsigned char> and use that instead of FLATDATA (Pieter Wuille)
833bc08 Add Slice: a (pointer, size) array view that acts like a container (Pieter Wuille)

Pull request description:

  Introduce a new data type `Span`, which is an encapsulated pointer + size (like C++20's `std::span` or LevelDB's `Slice`), and represents a view to a sequence of objects laid out continuously in memory.

  The immediate use case is replacing the remaining `FLATDATA` invocations. Instead of those, we support serializing/deserializing unsigned char `Span`s (treating them as arrays).

  A longer term goal for `Span`s is making the script execution operate on them rather than on `CScript` itself. This will allow separate storage mechanisms for scripts.

Tree-SHA512: 7b0da3c802e5df367f223275004d16b04262804c007b7c73fda927176f0a9c3b2ef3225fa842cb73500b0df73175ec1419f1f5239de2402e21dd9ae8e5d05233

1 files changed, 5 insertions, 4 deletions

diff --git a/src/compressor.h b/src/compressor.h
index 561c8e66d0..6bd68529d4 100644
--- a/src/compressor.h
+++ b/src/compressor.h
@@ -9,6 +9,7 @@
 #include <primitives/transaction.h>
 #include <script/script.h>
 #include <serialize.h>
+#include <span.h>
 
 class CKeyID;
 class CPubKey;
@@ -51,12 +52,12 @@ public:
     void Serialize(Stream &s) const {
         std::vector<unsigned char> compr;
         if (CompressScript(script, compr)) {
-            s << CFlatData(compr);
+            s << MakeSpan(compr);
             return;
         }
         unsigned int nSize = script.size() + nSpecialScripts;
         s << VARINT(nSize);
-        s << CFlatData(script);
+        s << MakeSpan(script);
     }
 
     template<typename Stream>
@@ -65,7 +66,7 @@ public:
         s >> VARINT(nSize);
         if (nSize < nSpecialScripts) {
             std::vector<unsigned char> vch(GetSpecialScriptSize(nSize), 0x00);
-            s >> CFlatData(vch);
+            s >> MakeSpan(vch);
             DecompressScript(script, nSize, vch);
             return;
         }
@@ -76,7 +77,7 @@ public:
             s.ignore(nSize);
         } else {
             script.resize(nSize);
-            s >> CFlatData(script);
+            s >> MakeSpan(script);
         }
     }
 };