Trivial: Fix validation comments

- Move comment about transaction/block weight calculation so it applies not only to the GetBlockWeight function but also to GetTransactionWeight
- Fix comment in validation.cpp referencing future deployment of BIP113. It has already been deployed.
- The doc comment for BLOCK_DOWNLOAD_WINDOW wasn't updated since pruning was introduced, so it still refers to pruning as something that might happen in the future. A larger BLOCK_DOWNLOAD_WINDOW window would now, indeed, make pruning harder.

1 files changed, 5 insertions, 6 deletions

diff --git a/src/consensus/validation.h b/src/consensus/validation.h
index 5494ce40ea..b6740c9d9f 100644
--- a/src/consensus/validation.h
+++ b/src/consensus/validation.h
@@ -89,17 +89,16 @@ public:
     std::string GetDebugMessage() const { return strDebugMessage; }
 };
 
+// These implement the weight = (stripped_size * 4) + witness_size formula,
+// using only serialization with and without witness data. As witness_size
+// is equal to total_size - stripped_size, this formula is identical to:
+// weight = (stripped_size * 3) + total_size.
 static inline int64_t GetTransactionWeight(const CTransaction& tx)
 {
-    return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR -1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
+    return ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
 }
-
 static inline int64_t GetBlockWeight(const CBlock& block)
 {
-    // This implements the weight = (stripped_size * 4) + witness_size formula,
-    // using only serialization with and without witness data. As witness_size
-    // is equal to total_size - stripped_size, this formula is identical to:
-    // weight = (stripped_size * 3) + total_size.
     return ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * (WITNESS_SCALE_FACTOR - 1) + ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION);
 }