refactor: SpanReader without nVersion

The field is unused, so remove it.

This is also required for future commits.

src/blockfilter.cpp

@@ -16,9 +16,6 @@
 #include <util/golombrice.h>
 #include <util/string.h>
 
-/// Protocol version used to serialize parameters in GCS filter encoding.
-static constexpr int GCS_SER_VERSION = 0;
-
 static const std::map<BlockFilterType, std::string> g_filter_types = {
     {BlockFilterType::BASIC, "basic"},
 };
@@ -49,7 +46,7 @@ GCSFilter::GCSFilter(const Params& params)
 GCSFilter::GCSFilter(const Params& params, std::vector<unsigned char> encoded_filter, bool skip_decode_check)
     : m_params(params), m_encoded(std::move(encoded_filter))
 {
-    SpanReader stream{GCS_SER_VERSION, m_encoded};
+    SpanReader stream{m_encoded};
 
     uint64_t N = ReadCompactSize(stream);
     m_N = static_cast<uint32_t>(N);
@@ -62,7 +59,7 @@ GCSFilter::GCSFilter(const Params& params, std::vector<unsigned char> encoded_fi
 
     // Verify that the encoded filter contains exactly N elements. If it has too much or too little
     // data, a std::ios_base::failure exception will be raised.
-    BitStreamReader<SpanReader> bitreader{stream};
+    BitStreamReader bitreader{stream};
     for (uint64_t i = 0; i < m_N; ++i) {
         GolombRiceDecode(bitreader, m_params.m_P);
     }
@@ -103,13 +100,13 @@ GCSFilter::GCSFilter(const Params& params, const ElementSet& elements)
 
 bool GCSFilter::MatchInternal(const uint64_t* element_hashes, size_t size) const
 {
-    SpanReader stream{GCS_SER_VERSION, m_encoded};
+    SpanReader stream{m_encoded};
 
     // Seek forward by size of N
     uint64_t N = ReadCompactSize(stream);
     assert(N == m_N);
 
-    BitStreamReader<SpanReader> bitreader{stream};
+    BitStreamReader bitreader{stream};
 
     uint64_t value = 0;
     size_t hashes_index = 0;

src/psbt.h

@@ -382,7 +382,7 @@ struct PSBTInput
             }
 
             // Type is compact size uint at beginning of key
-            SpanReader skey{s.GetVersion(), key};
+            SpanReader skey{key};
             uint64_t type = ReadCompactSize(skey);
 
             // Do stuff based on type
@@ -590,7 +590,7 @@ struct PSBTInput
                     } else if (key.size() != 65) {
                         throw std::ios_base::failure("Input Taproot script signature key is not 65 bytes");
                     }
-                    SpanReader s_key{s.GetVersion(), Span{key}.subspan(1)};
+                    SpanReader s_key{Span{key}.subspan(1)};
                     XOnlyPubKey xonly;
                     uint256 hash;
                     s_key >> xonly;
@@ -632,7 +632,7 @@ struct PSBTInput
                     } else if (key.size() != 33) {
                         throw std::ios_base::failure("Input Taproot BIP32 keypath key is not at 33 bytes");
                     }
-                    SpanReader s_key{s.GetVersion(), Span{key}.subspan(1)};
+                    SpanReader s_key{Span{key}.subspan(1)};
                     XOnlyPubKey xonly;
                     s_key >> xonly;
                     std::set<uint256> leaf_hashes;
@@ -807,7 +807,7 @@ struct PSBTOutput
             }
 
             // Type is compact size uint at beginning of key
-            SpanReader skey{s.GetVersion(), key};
+            SpanReader skey{key};
             uint64_t type = ReadCompactSize(skey);
 
             // Do stuff based on type
@@ -856,7 +856,7 @@ struct PSBTOutput
                     }
                     std::vector<unsigned char> tree_v;
                     s >> tree_v;
-                    SpanReader s_tree{s.GetVersion(), tree_v};
+                    SpanReader s_tree{tree_v};
                     if (s_tree.empty()) {
                         throw std::ios_base::failure("Output Taproot tree must not be empty");
                     }
@@ -1060,7 +1060,7 @@ struct PartiallySignedTransaction
             }
 
             // Type is compact size uint at beginning of key
-            SpanReader skey{s.GetVersion(), key};
+            SpanReader skey{key};
             uint64_t type = ReadCompactSize(skey);
 
             // Do stuff based on type

src/signet.cpp

@@ -22,7 +22,6 @@
 #include <streams.h>
 #include <uint256.h>
 #include <util/strencodings.h>
-#include <version.h>
 
 static constexpr uint8_t SIGNET_HEADER[4] = {0xec, 0xc7, 0xda, 0xa2};
 
@@ -99,7 +98,7 @@ std::optional<SignetTxs> SignetTxs::Create(const CBlock& block, const CScript& c
         // no signet solution -- allow this to support OP_TRUE as trivial block challenge
     } else {
         try {
-            SpanReader v{INIT_PROTO_VERSION, signet_solution};
+            SpanReader v{signet_solution};
             v >> tx_spending.vin[0].scriptSig;
             v >> tx_spending.vin[0].scriptWitness.stack;
             if (!v.empty()) return std::nullopt; // extraneous data encountered

src/streams.h

@@ -100,16 +100,13 @@ private:
 class SpanReader
 {
 private:
-    const int m_version;
     Span<const unsigned char> m_data;
 
 public:
     /**
-     * @param[in]  version Serialization Version (including any flags)
      * @param[in]  data Referenced byte vector to overwrite/append
      */
-    SpanReader(int version, Span<const unsigned char> data)
+    explicit SpanReader(Span<const unsigned char> data) : m_data{data} {}
-        : m_version{version}, m_data{data} {}
 
     template<typename T>
     SpanReader& operator>>(T&& obj)
@@ -118,8 +115,6 @@ public:
         return (*this);
     }
 
-    int GetVersion() const { return m_version; }
-
     size_t size() const { return m_data.size(); }
     bool empty() const { return m_data.empty(); }
 

src/test/fuzz/golomb_rice.cpp

@@ -68,8 +68,8 @@ FUZZ_TARGET(golomb_rice)
 
     std::vector<uint64_t> decoded_deltas;
     {
-        SpanReader stream{0, golomb_rice_data};
+        SpanReader stream{golomb_rice_data};
-        BitStreamReader<SpanReader> bitreader{stream};
+        BitStreamReader bitreader{stream};
         const uint32_t n = static_cast<uint32_t>(ReadCompactSize(stream));
         for (uint32_t i = 0; i < n; ++i) {
             decoded_deltas.push_back(GolombRiceDecode(bitreader, BASIC_FILTER_P));
@@ -80,14 +80,14 @@ FUZZ_TARGET(golomb_rice)
 
     {
         const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider, 1024);
-        SpanReader stream{0, random_bytes};
+        SpanReader stream{random_bytes};
         uint32_t n;
         try {
             n = static_cast<uint32_t>(ReadCompactSize(stream));
         } catch (const std::ios_base::failure&) {
             return;
         }
-        BitStreamReader<SpanReader> bitreader{stream};
+        BitStreamReader bitreader{stream};
         for (uint32_t i = 0; i < std::min<uint32_t>(n, 1024); ++i) {
             try {
                 (void)GolombRiceDecode(bitreader, BASIC_FILTER_P);

src/test/fuzz/script_assets_test_minimizer.cpp

@@ -54,7 +54,7 @@ CMutableTransaction TxFromHex(const std::string& str)
 {
     CMutableTransaction tx;
     try {
-        SpanReader{0, CheckedParseHex(str)} >> TX_NO_WITNESS(tx);
+        SpanReader{CheckedParseHex(str)} >> TX_NO_WITNESS(tx);
     } catch (const std::ios_base::failure&) {
         throw std::runtime_error("Tx deserialization failure");
     }
@@ -68,7 +68,7 @@ std::vector<CTxOut> TxOutsFromJSON(const UniValue& univalue)
     for (size_t i = 0; i < univalue.size(); ++i) {
         CTxOut txout;
         try {
-            SpanReader{0, CheckedParseHex(univalue[i].get_str())} >> txout;
+            SpanReader{CheckedParseHex(univalue[i].get_str())} >> txout;
         } catch (const std::ios_base::failure&) {
             throw std::runtime_error("Prevout invalid format");
         }

src/test/script_tests.cpp

@@ -1470,7 +1470,7 @@ BOOST_AUTO_TEST_CASE(script_HasValidOps)
 static CMutableTransaction TxFromHex(const std::string& str)
 {
     CMutableTransaction tx;
-    SpanReader{0, ParseHex(str)} >> TX_NO_WITNESS(tx);
+    SpanReader{ParseHex(str)} >> TX_NO_WITNESS(tx);
     return tx;
 }
 
@@ -1480,7 +1480,7 @@ static std::vector<CTxOut> TxOutsFromJSON(const UniValue& univalue)
     std::vector<CTxOut> prevouts;
     for (size_t i = 0; i < univalue.size(); ++i) {
         CTxOut txout;
-        SpanReader{0, ParseHex(univalue[i].get_str())} >> txout;
+        SpanReader{ParseHex(univalue[i].get_str())} >> txout;
         prevouts.push_back(std::move(txout));
     }
     return prevouts;
@@ -1816,7 +1816,7 @@ BOOST_AUTO_TEST_CASE(bip341_keypath_test_vectors)
     for (const auto& vec : vectors.getValues()) {
         auto txhex = ParseHex(vec["given"]["rawUnsignedTx"].get_str());
         CMutableTransaction tx;
-        SpanReader{PROTOCOL_VERSION, txhex} >> TX_WITH_WITNESS(tx);
+        SpanReader{txhex} >> TX_WITH_WITNESS(tx);
         std::vector<CTxOut> utxos;
         for (const auto& utxo_spent : vec["given"]["utxosSpent"].getValues()) {
             auto script_bytes = ParseHex(utxo_spent["scriptPubKey"].get_str());

src/test/streams_tests.cpp

@@ -125,7 +125,7 @@ BOOST_AUTO_TEST_CASE(streams_vector_reader)
 {
     std::vector<unsigned char> vch = {1, 255, 3, 4, 5, 6};
 
-    SpanReader reader{INIT_PROTO_VERSION, vch};
+    SpanReader reader{vch};
     BOOST_CHECK_EQUAL(reader.size(), 6U);
     BOOST_CHECK(!reader.empty());
 
@@ -155,7 +155,7 @@ BOOST_AUTO_TEST_CASE(streams_vector_reader)
     BOOST_CHECK_THROW(reader >> d, std::ios_base::failure);
 
     // Read a 4 bytes as a signed int from the beginning of the buffer.
-    SpanReader new_reader{INIT_PROTO_VERSION, vch};
+    SpanReader new_reader{vch};
     new_reader >> d;
     BOOST_CHECK_EQUAL(d, 67370753); // 1,255,3,4 in little-endian base-256
     BOOST_CHECK_EQUAL(new_reader.size(), 2U);
@@ -169,7 +169,7 @@ BOOST_AUTO_TEST_CASE(streams_vector_reader)
 BOOST_AUTO_TEST_CASE(streams_vector_reader_rvalue)
 {
     std::vector<uint8_t> data{0x82, 0xa7, 0x31};
-    SpanReader reader{INIT_PROTO_VERSION, data};
+    SpanReader reader{data};
     uint32_t varint = 0;
     // Deserialize into r-value
     reader >> VARINT(varint);

src/wallet/test/wallet_tests.cpp

@@ -759,7 +759,7 @@ BOOST_FIXTURE_TEST_CASE(wallet_descriptor_test, BasicTestingSetup)
     vw << int32_t{0};
     vw << int32_t{1};
 
-    SpanReader vr{0, malformed_record};
+    SpanReader vr{malformed_record};
     WalletDescriptor w_desc;
     BOOST_CHECK_EXCEPTION(vr >> w_desc, std::ios_base::failure, malformed_descriptor);
 }