diff options
| -rw-r--r-- | src/hash.h | 35 | ||||
| -rw-r--r-- | src/validation.cpp | 9 |
2 files changed, 39 insertions, 5 deletions
diff --git a/src/hash.h b/src/hash.h index eacb8f04fe..b8de19c0fd 100644 --- a/src/hash.h +++ b/src/hash.h @@ -160,6 +160,41 @@ public: } }; +/** Reads data from an underlying stream, while hashing the read data. */ +template<typename Source> +class CHashVerifier : public CHashWriter +{ +private: + Source* source; + +public: + CHashVerifier(Source* source_) : CHashWriter(source_->GetType(), source_->GetVersion()), source(source_) {} + + void read(char* pch, size_t nSize) + { + source->read(pch, nSize); + this->write(pch, nSize); + } + + void ignore(size_t nSize) + { + char data[1024]; + while (nSize > 0) { + size_t now = std::min<size_t>(nSize, 1024); + read(data, now); + nSize -= now; + } + } + + template<typename T> + CHashVerifier<Source>& operator>>(T& obj) + { + // Unserialize from this stream + ::Unserialize(*this, obj); + return (*this); + } +}; + /** Compute the 256-bit hash of an object's serialization. */ template<typename T> uint256 SerializeHash(const T& obj, int nType=SER_GETHASH, int nVersion=PROTOCOL_VERSION) diff --git a/src/validation.cpp b/src/validation.cpp index ed94be5c26..fc7e129c05 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -1210,8 +1210,10 @@ bool UndoReadFromDisk(CBlockUndo& blockundo, const CDiskBlockPos& pos, const uin // Read block uint256 hashChecksum; + CHashVerifier<CAutoFile> verifier(&filein); // We need a CHashVerifier as reserializing may lose data try { - filein >> blockundo; + verifier << hashBlock; + verifier >> blockundo; filein >> hashChecksum; } catch (const std::exception& e) { @@ -1219,10 +1221,7 @@ bool UndoReadFromDisk(CBlockUndo& blockundo, const CDiskBlockPos& pos, const uin } // Verify checksum - CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION); - hasher << hashBlock; - hasher << blockundo; - if (hashChecksum != hasher.GetHash()) + if (hashChecksum != verifier.GetHash()) return error("%s: Checksum mismatch", __func__); return true; |