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Merge pull request #532 from syscoin/dev-4.x-spt-clean
wip spt clean
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| Original file line number | Diff line number | Diff line change |
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@@ -189,4 +189,4 @@ uint64_t DecompressAmount(uint64_t x) | |
| e--; | ||
| } | ||
| return n; | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,118 @@ | ||
| // Copyright (c) 2009-2010 Satoshi Nakamoto | ||
| // Copyright (c) 2009-2021 The Bitcoin Core developers | ||
| // Distributed under the MIT software license, see the accompanying | ||
| // file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
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| #ifndef SYSCOIN_COMPRESSOR_H | ||
| #define SYSCOIN_COMPRESSOR_H | ||
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| #include <prevector.h> | ||
| #include <primitives/transaction.h> | ||
| #include <script/script.h> | ||
| #include <serialize.h> | ||
| #include <span.h> | ||
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| /** | ||
| * This saves us from making many heap allocations when serializing | ||
| * and deserializing compressed scripts. | ||
| * | ||
| * This prevector size is determined by the largest .resize() in the | ||
| * CompressScript function. The largest compressed script format is a | ||
| * compressed public key, which is 33 bytes. | ||
| */ | ||
| using CompressedScript = prevector<33, unsigned char>; | ||
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| bool CompressScript(const CScript& script, CompressedScript& out); | ||
| unsigned int GetSpecialScriptSize(unsigned int nSize); | ||
| bool DecompressScript(CScript& script, unsigned int nSize, const CompressedScript& in); | ||
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| /** | ||
| * Compress amount. | ||
| * | ||
| * nAmount is of type uint64_t and thus cannot be negative. If you're passing in | ||
| * a CAmount (int64_t), make sure to properly handle the case where the amount | ||
| * is negative before calling CompressAmount(...). | ||
| * | ||
| * @pre Function defined only for 0 <= nAmount <= MAX_MONEY. | ||
| */ | ||
| uint64_t CompressAmount(uint64_t nAmount); | ||
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| uint64_t DecompressAmount(uint64_t nAmount); | ||
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| /** 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. | ||
| */ | ||
| struct ScriptCompression | ||
| { | ||
| /** | ||
| * 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; | ||
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| template<typename Stream> | ||
| void Ser(Stream &s, const CScript& script) { | ||
| CompressedScript compr; | ||
| if (CompressScript(script, compr)) { | ||
| s << Span{compr}; | ||
| return; | ||
| } | ||
| unsigned int nSize = script.size() + nSpecialScripts; | ||
| s << VARINT(nSize); | ||
| s << Span{script}; | ||
| } | ||
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| template<typename Stream> | ||
| void Unser(Stream &s, CScript& script) { | ||
| unsigned int nSize = 0; | ||
| s >> VARINT(nSize); | ||
| if (nSize < nSpecialScripts) { | ||
| CompressedScript vch(GetSpecialScriptSize(nSize), 0x00); | ||
| s >> Span{vch}; | ||
| DecompressScript(script, nSize, vch); | ||
| return; | ||
| } | ||
| nSize -= nSpecialScripts; | ||
| if (nSize > MAX_SCRIPT_SIZE) { | ||
| // Overly long script, replace with a short invalid one | ||
| script << OP_RETURN; | ||
| s.ignore(nSize); | ||
| } else { | ||
| script.resize(nSize); | ||
| s >> Span{script}; | ||
| } | ||
| } | ||
| }; | ||
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| struct AmountCompression | ||
| { | ||
| template<typename Stream, typename I> void Ser(Stream& s, I val) | ||
| { | ||
| s << VARINT(CompressAmount(val)); | ||
| } | ||
| template<typename Stream, typename I> void Unser(Stream& s, I& val) | ||
| { | ||
| uint64_t v; | ||
| s >> VARINT(v); | ||
| val = DecompressAmount(v); | ||
| } | ||
| }; | ||
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| /** wrapper for CTxOut that provides a more compact serialization */ | ||
| struct TxOutCompression | ||
| { | ||
| FORMATTER_METHODS(CTxOut, obj) { READWRITE(Using<AmountCompression>(obj.nValue), Using<ScriptCompression>(obj.scriptPubKey)); } | ||
| }; | ||
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| #endif // SYSCOIN_COMPRESSOR_H |
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