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Diffstat (limited to 'src/script/compressor.h')
-rw-r--r-- | src/script/compressor.h | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/src/script/compressor.h b/src/script/compressor.h deleted file mode 100644 index 154e0b2662..0000000000 --- a/src/script/compressor.h +++ /dev/null @@ -1,89 +0,0 @@ -// Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2014 The Bitcoin developers -// Distributed under the MIT software license, see the accompanying -// file COPYING or http://www.opensource.org/licenses/mit-license.php. - -#ifndef H_BITCOIN_SCRIPT_COMPRESSOR -#define H_BITCOIN_SCRIPT_COMPRESSOR - -#include "script/script.h" -#include "serialize.h" - -class CKeyID; -class CPubKey; -class CScriptID; - -/** Compact serializer for scripts. - * - * It detects common cases and encodes them much more efficiently. - * 3 special cases are defined: - * * Pay to pubkey hash (encoded as 21 bytes) - * * Pay to script hash (encoded as 21 bytes) - * * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes) - * - * Other scripts up to 121 bytes require 1 byte + script length. Above - * that, scripts up to 16505 bytes require 2 bytes + script length. - */ -class CScriptCompressor -{ -private: - // make this static for now (there are only 6 special scripts defined) - // this can potentially be extended together with a new nVersion for - // transactions, in which case this value becomes dependent on nVersion - // and nHeight of the enclosing transaction. - static const unsigned int nSpecialScripts = 6; - - CScript &script; -protected: - // These check for scripts for which a special case with a shorter encoding is defined. - // They are implemented separately from the CScript test, as these test for exact byte - // sequence correspondences, and are more strict. For example, IsToPubKey also verifies - // whether the public key is valid (as invalid ones cannot be represented in compressed - // form). - bool IsToKeyID(CKeyID &hash) const; - bool IsToScriptID(CScriptID &hash) const; - bool IsToPubKey(CPubKey &pubkey) const; - - bool Compress(std::vector<unsigned char> &out) const; - unsigned int GetSpecialSize(unsigned int nSize) const; - bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out); -public: - CScriptCompressor(CScript &scriptIn) : script(scriptIn) { } - - unsigned int GetSerializeSize(int nType, int nVersion) const { - std::vector<unsigned char> compr; - if (Compress(compr)) - return compr.size(); - unsigned int nSize = script.size() + nSpecialScripts; - return script.size() + VARINT(nSize).GetSerializeSize(nType, nVersion); - } - - template<typename Stream> - void Serialize(Stream &s, int nType, int nVersion) const { - std::vector<unsigned char> compr; - if (Compress(compr)) { - s << CFlatData(compr); - return; - } - unsigned int nSize = script.size() + nSpecialScripts; - s << VARINT(nSize); - s << CFlatData(script); - } - - template<typename Stream> - void Unserialize(Stream &s, int nType, int nVersion) { - unsigned int nSize = 0; - s >> VARINT(nSize); - if (nSize < nSpecialScripts) { - std::vector<unsigned char> vch(GetSpecialSize(nSize), 0x00); - s >> REF(CFlatData(vch)); - Decompress(nSize, vch); - return; - } - nSize -= nSpecialScripts; - script.resize(nSize); - s >> REF(CFlatData(script)); - } -}; - -#endif // H_BITCOIN_SCRIPT_COMPRESSOR |