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authorjtimon <jtimon@monetize.io>2014-08-14 13:54:05 +0200
committerPieter Wuille <pieter.wuille@gmail.com>2014-09-08 20:19:31 +0200
commit86dbeea2cdd5749374c98afea3e4f5f49817f746 (patch)
tree66325232600dc519eef6244e6dc18bdafec41185 /src/script.h
parentdf623d83dad6aa39141b066ebd2f870ee05acf41 (diff)
Rename script.h/.cpp to scriptutils.h/.cpp (plus remove duplicated includes)
Diffstat (limited to 'src/script.h')
-rw-r--r--src/script.h815
1 files changed, 0 insertions, 815 deletions
diff --git a/src/script.h b/src/script.h
deleted file mode 100644
index d17cfe3fa4..0000000000
--- a/src/script.h
+++ /dev/null
@@ -1,815 +0,0 @@
-// Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#ifndef H_BITCOIN_SCRIPT
-#define H_BITCOIN_SCRIPT
-
-#include "key.h"
-#include "utilstrencodings.h"
-#include "tinyformat.h"
-
-#include <stdexcept>
-#include <stdint.h>
-#include <string>
-#include <vector>
-
-#include <boost/variant.hpp>
-
-class CKeyStore;
-class CTransaction;
-struct CMutableTransaction;
-
-static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes
-static const unsigned int MAX_OP_RETURN_RELAY = 40; // bytes
-
-class scriptnum_error : public std::runtime_error
-{
-public:
- explicit scriptnum_error(const std::string& str) : std::runtime_error(str) {}
-};
-
-class CScriptNum
-{
-// Numeric opcodes (OP_1ADD, etc) are restricted to operating on 4-byte integers.
-// The semantics are subtle, though: operands must be in the range [-2^31 +1...2^31 -1],
-// but results may overflow (and are valid as long as they are not used in a subsequent
-// numeric operation). CScriptNum enforces those semantics by storing results as
-// an int64 and allowing out-of-range values to be returned as a vector of bytes but
-// throwing an exception if arithmetic is done or the result is interpreted as an integer.
-public:
-
- explicit CScriptNum(const int64_t& n)
- {
- m_value = n;
- }
-
- explicit CScriptNum(const std::vector<unsigned char>& vch)
- {
- if (vch.size() > nMaxNumSize)
- throw scriptnum_error("CScriptNum(const std::vector<unsigned char>&) : overflow");
- m_value = set_vch(vch);
- }
-
- inline bool operator==(const int64_t& rhs) const { return m_value == rhs; }
- inline bool operator!=(const int64_t& rhs) const { return m_value != rhs; }
- inline bool operator<=(const int64_t& rhs) const { return m_value <= rhs; }
- inline bool operator< (const int64_t& rhs) const { return m_value < rhs; }
- inline bool operator>=(const int64_t& rhs) const { return m_value >= rhs; }
- inline bool operator> (const int64_t& rhs) const { return m_value > rhs; }
-
- inline bool operator==(const CScriptNum& rhs) const { return operator==(rhs.m_value); }
- inline bool operator!=(const CScriptNum& rhs) const { return operator!=(rhs.m_value); }
- inline bool operator<=(const CScriptNum& rhs) const { return operator<=(rhs.m_value); }
- inline bool operator< (const CScriptNum& rhs) const { return operator< (rhs.m_value); }
- inline bool operator>=(const CScriptNum& rhs) const { return operator>=(rhs.m_value); }
- inline bool operator> (const CScriptNum& rhs) const { return operator> (rhs.m_value); }
-
- inline CScriptNum operator+( const int64_t& rhs) const { return CScriptNum(m_value + rhs);}
- inline CScriptNum operator-( const int64_t& rhs) const { return CScriptNum(m_value - rhs);}
- inline CScriptNum operator+( const CScriptNum& rhs) const { return operator+(rhs.m_value); }
- inline CScriptNum operator-( const CScriptNum& rhs) const { return operator-(rhs.m_value); }
-
- inline CScriptNum& operator+=( const CScriptNum& rhs) { return operator+=(rhs.m_value); }
- inline CScriptNum& operator-=( const CScriptNum& rhs) { return operator-=(rhs.m_value); }
-
- inline CScriptNum operator-() const
- {
- assert(m_value != std::numeric_limits<int64_t>::min());
- return CScriptNum(-m_value);
- }
-
- inline CScriptNum& operator=( const int64_t& rhs)
- {
- m_value = rhs;
- return *this;
- }
-
- inline CScriptNum& operator+=( const int64_t& rhs)
- {
- assert(rhs == 0 || (rhs > 0 && m_value <= std::numeric_limits<int64_t>::max() - rhs) ||
- (rhs < 0 && m_value >= std::numeric_limits<int64_t>::min() - rhs));
- m_value += rhs;
- return *this;
- }
-
- inline CScriptNum& operator-=( const int64_t& rhs)
- {
- assert(rhs == 0 || (rhs > 0 && m_value >= std::numeric_limits<int64_t>::min() + rhs) ||
- (rhs < 0 && m_value <= std::numeric_limits<int64_t>::max() + rhs));
- m_value -= rhs;
- return *this;
- }
-
- int getint() const
- {
- if (m_value > std::numeric_limits<int>::max())
- return std::numeric_limits<int>::max();
- else if (m_value < std::numeric_limits<int>::min())
- return std::numeric_limits<int>::min();
- return m_value;
- }
-
- std::vector<unsigned char> getvch() const
- {
- return serialize(m_value);
- }
-
- static std::vector<unsigned char> serialize(const int64_t& value)
- {
- if(value == 0)
- return std::vector<unsigned char>();
-
- std::vector<unsigned char> result;
- const bool neg = value < 0;
- uint64_t absvalue = neg ? -value : value;
-
- while(absvalue)
- {
- result.push_back(absvalue & 0xff);
- absvalue >>= 8;
- }
-
-
-// - If the most significant byte is >= 0x80 and the value is positive, push a
-// new zero-byte to make the significant byte < 0x80 again.
-
-// - If the most significant byte is >= 0x80 and the value is negative, push a
-// new 0x80 byte that will be popped off when converting to an integral.
-
-// - If the most significant byte is < 0x80 and the value is negative, add
-// 0x80 to it, since it will be subtracted and interpreted as a negative when
-// converting to an integral.
-
- if (result.back() & 0x80)
- result.push_back(neg ? 0x80 : 0);
- else if (neg)
- result.back() |= 0x80;
-
- return result;
- }
-
- static const size_t nMaxNumSize = 4;
-
-private:
- static int64_t set_vch(const std::vector<unsigned char>& vch)
- {
- if (vch.empty())
- return 0;
-
- int64_t result = 0;
- for (size_t i = 0; i != vch.size(); ++i)
- result |= static_cast<int64_t>(vch[i]) << 8*i;
-
- // If the input vector's most significant byte is 0x80, remove it from
- // the result's msb and return a negative.
- if (vch.back() & 0x80)
- return -(result & ~(0x80ULL << (8 * (vch.size() - 1))));
-
- return result;
- }
-
- int64_t m_value;
-};
-
-/** Signature hash types/flags */
-enum
-{
- SIGHASH_ALL = 1,
- SIGHASH_NONE = 2,
- SIGHASH_SINGLE = 3,
- SIGHASH_ANYONECANPAY = 0x80,
-};
-
-/** Script verification flags */
-enum
-{
- SCRIPT_VERIFY_NONE = 0,
- SCRIPT_VERIFY_P2SH = (1U << 0), // evaluate P2SH (BIP16) subscripts
- SCRIPT_VERIFY_STRICTENC = (1U << 1), // enforce strict conformance to DER and SEC2 for signatures and pubkeys
- SCRIPT_VERIFY_LOW_S = (1U << 2), // enforce low S values (<n/2) in signatures (depends on STRICTENC)
- SCRIPT_VERIFY_NOCACHE = (1U << 3), // do not store results in signature cache (but do query it)
- SCRIPT_VERIFY_NULLDUMMY = (1U << 4), // verify dummy stack item consumed by CHECKMULTISIG is of zero-length
-};
-
-/** IsMine() return codes */
-enum isminetype
-{
- ISMINE_NO = 0,
- ISMINE_WATCH_ONLY = 1,
- ISMINE_SPENDABLE = 2,
- ISMINE_ALL = ISMINE_WATCH_ONLY | ISMINE_SPENDABLE
-};
-/** used for bitflags of isminetype */
-typedef uint8_t isminefilter;
-
-// Mandatory script verification flags that all new blocks must comply with for
-// them to be valid. (but old blocks may not comply with) Currently just P2SH,
-// but in the future other flags may be added, such as a soft-fork to enforce
-// strict DER encoding.
-//
-// Failing one of these tests may trigger a DoS ban - see CheckInputs() for
-// details.
-static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
-
-// Standard script verification flags that standard transactions will comply
-// with. However scripts violating these flags may still be present in valid
-// blocks and we must accept those blocks.
-static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
- SCRIPT_VERIFY_STRICTENC |
- SCRIPT_VERIFY_NULLDUMMY;
-
-// For convenience, standard but not mandatory verify flags.
-static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
-
-enum txnouttype
-{
- TX_NONSTANDARD,
- // 'standard' transaction types:
- TX_PUBKEY,
- TX_PUBKEYHASH,
- TX_SCRIPTHASH,
- TX_MULTISIG,
- TX_NULL_DATA,
-};
-
-class CNoDestination {
-public:
- friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
- friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
-};
-
-/** A txout script template with a specific destination. It is either:
- * * CNoDestination: no destination set
- * * CKeyID: TX_PUBKEYHASH destination
- * * CScriptID: TX_SCRIPTHASH destination
- * A CTxDestination is the internal data type encoded in a CBitcoinAddress
- */
-typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
-
-const char* GetTxnOutputType(txnouttype t);
-
-/** Script opcodes */
-enum opcodetype
-{
- // push value
- OP_0 = 0x00,
- OP_FALSE = OP_0,
- OP_PUSHDATA1 = 0x4c,
- OP_PUSHDATA2 = 0x4d,
- OP_PUSHDATA4 = 0x4e,
- OP_1NEGATE = 0x4f,
- OP_RESERVED = 0x50,
- OP_1 = 0x51,
- OP_TRUE=OP_1,
- OP_2 = 0x52,
- OP_3 = 0x53,
- OP_4 = 0x54,
- OP_5 = 0x55,
- OP_6 = 0x56,
- OP_7 = 0x57,
- OP_8 = 0x58,
- OP_9 = 0x59,
- OP_10 = 0x5a,
- OP_11 = 0x5b,
- OP_12 = 0x5c,
- OP_13 = 0x5d,
- OP_14 = 0x5e,
- OP_15 = 0x5f,
- OP_16 = 0x60,
-
- // control
- OP_NOP = 0x61,
- OP_VER = 0x62,
- OP_IF = 0x63,
- OP_NOTIF = 0x64,
- OP_VERIF = 0x65,
- OP_VERNOTIF = 0x66,
- OP_ELSE = 0x67,
- OP_ENDIF = 0x68,
- OP_VERIFY = 0x69,
- OP_RETURN = 0x6a,
-
- // stack ops
- OP_TOALTSTACK = 0x6b,
- OP_FROMALTSTACK = 0x6c,
- OP_2DROP = 0x6d,
- OP_2DUP = 0x6e,
- OP_3DUP = 0x6f,
- OP_2OVER = 0x70,
- OP_2ROT = 0x71,
- OP_2SWAP = 0x72,
- OP_IFDUP = 0x73,
- OP_DEPTH = 0x74,
- OP_DROP = 0x75,
- OP_DUP = 0x76,
- OP_NIP = 0x77,
- OP_OVER = 0x78,
- OP_PICK = 0x79,
- OP_ROLL = 0x7a,
- OP_ROT = 0x7b,
- OP_SWAP = 0x7c,
- OP_TUCK = 0x7d,
-
- // splice ops
- OP_CAT = 0x7e,
- OP_SUBSTR = 0x7f,
- OP_LEFT = 0x80,
- OP_RIGHT = 0x81,
- OP_SIZE = 0x82,
-
- // bit logic
- OP_INVERT = 0x83,
- OP_AND = 0x84,
- OP_OR = 0x85,
- OP_XOR = 0x86,
- OP_EQUAL = 0x87,
- OP_EQUALVERIFY = 0x88,
- OP_RESERVED1 = 0x89,
- OP_RESERVED2 = 0x8a,
-
- // numeric
- OP_1ADD = 0x8b,
- OP_1SUB = 0x8c,
- OP_2MUL = 0x8d,
- OP_2DIV = 0x8e,
- OP_NEGATE = 0x8f,
- OP_ABS = 0x90,
- OP_NOT = 0x91,
- OP_0NOTEQUAL = 0x92,
-
- OP_ADD = 0x93,
- OP_SUB = 0x94,
- OP_MUL = 0x95,
- OP_DIV = 0x96,
- OP_MOD = 0x97,
- OP_LSHIFT = 0x98,
- OP_RSHIFT = 0x99,
-
- OP_BOOLAND = 0x9a,
- OP_BOOLOR = 0x9b,
- OP_NUMEQUAL = 0x9c,
- OP_NUMEQUALVERIFY = 0x9d,
- OP_NUMNOTEQUAL = 0x9e,
- OP_LESSTHAN = 0x9f,
- OP_GREATERTHAN = 0xa0,
- OP_LESSTHANOREQUAL = 0xa1,
- OP_GREATERTHANOREQUAL = 0xa2,
- OP_MIN = 0xa3,
- OP_MAX = 0xa4,
-
- OP_WITHIN = 0xa5,
-
- // crypto
- OP_RIPEMD160 = 0xa6,
- OP_SHA1 = 0xa7,
- OP_SHA256 = 0xa8,
- OP_HASH160 = 0xa9,
- OP_HASH256 = 0xaa,
- OP_CODESEPARATOR = 0xab,
- OP_CHECKSIG = 0xac,
- OP_CHECKSIGVERIFY = 0xad,
- OP_CHECKMULTISIG = 0xae,
- OP_CHECKMULTISIGVERIFY = 0xaf,
-
- // expansion
- OP_NOP1 = 0xb0,
- OP_NOP2 = 0xb1,
- OP_NOP3 = 0xb2,
- OP_NOP4 = 0xb3,
- OP_NOP5 = 0xb4,
- OP_NOP6 = 0xb5,
- OP_NOP7 = 0xb6,
- OP_NOP8 = 0xb7,
- OP_NOP9 = 0xb8,
- OP_NOP10 = 0xb9,
-
-
-
- // template matching params
- OP_SMALLDATA = 0xf9,
- OP_SMALLINTEGER = 0xfa,
- OP_PUBKEYS = 0xfb,
- OP_PUBKEYHASH = 0xfd,
- OP_PUBKEY = 0xfe,
-
- OP_INVALIDOPCODE = 0xff,
-};
-
-const char* GetOpName(opcodetype opcode);
-
-
-
-inline std::string ValueString(const std::vector<unsigned char>& vch)
-{
- if (vch.size() <= 4)
- return strprintf("%d", CScriptNum(vch).getint());
- else
- return HexStr(vch);
-}
-
-/** Serialized script, used inside transaction inputs and outputs */
-class CScript : public std::vector<unsigned char>
-{
-protected:
- CScript& push_int64(int64_t n)
- {
- if (n == -1 || (n >= 1 && n <= 16))
- {
- push_back(n + (OP_1 - 1));
- }
- else
- {
- *this << CScriptNum::serialize(n);
- }
- return *this;
- }
-public:
- CScript() { }
- CScript(const CScript& b) : std::vector<unsigned char>(b.begin(), b.end()) { }
- CScript(const_iterator pbegin, const_iterator pend) : std::vector<unsigned char>(pbegin, pend) { }
-#ifndef _MSC_VER
- CScript(const unsigned char* pbegin, const unsigned char* pend) : std::vector<unsigned char>(pbegin, pend) { }
-#endif
-
- CScript& operator+=(const CScript& b)
- {
- insert(end(), b.begin(), b.end());
- return *this;
- }
-
- friend CScript operator+(const CScript& a, const CScript& b)
- {
- CScript ret = a;
- ret += b;
- return ret;
- }
-
-
- CScript(int64_t b) { operator<<(b); }
-
- explicit CScript(opcodetype b) { operator<<(b); }
- explicit CScript(const uint256& b) { operator<<(b); }
- explicit CScript(const CScriptNum& b) { operator<<(b); }
- explicit CScript(const std::vector<unsigned char>& b) { operator<<(b); }
-
-
- CScript& operator<<(int64_t b) { return push_int64(b); }
-
- CScript& operator<<(opcodetype opcode)
- {
- if (opcode < 0 || opcode > 0xff)
- throw std::runtime_error("CScript::operator<<() : invalid opcode");
- insert(end(), (unsigned char)opcode);
- return *this;
- }
-
- CScript& operator<<(const uint160& b)
- {
- insert(end(), sizeof(b));
- insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
- return *this;
- }
-
- CScript& operator<<(const uint256& b)
- {
- insert(end(), sizeof(b));
- insert(end(), (unsigned char*)&b, (unsigned char*)&b + sizeof(b));
- return *this;
- }
-
- CScript& operator<<(const CPubKey& key)
- {
- assert(key.size() < OP_PUSHDATA1);
- insert(end(), (unsigned char)key.size());
- insert(end(), key.begin(), key.end());
- return *this;
- }
-
- CScript& operator<<(const CScriptNum& b)
- {
- *this << b.getvch();
- return *this;
- }
-
- CScript& operator<<(const std::vector<unsigned char>& b)
- {
- if (b.size() < OP_PUSHDATA1)
- {
- insert(end(), (unsigned char)b.size());
- }
- else if (b.size() <= 0xff)
- {
- insert(end(), OP_PUSHDATA1);
- insert(end(), (unsigned char)b.size());
- }
- else if (b.size() <= 0xffff)
- {
- insert(end(), OP_PUSHDATA2);
- unsigned short nSize = b.size();
- insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
- }
- else
- {
- insert(end(), OP_PUSHDATA4);
- unsigned int nSize = b.size();
- insert(end(), (unsigned char*)&nSize, (unsigned char*)&nSize + sizeof(nSize));
- }
- insert(end(), b.begin(), b.end());
- return *this;
- }
-
- CScript& operator<<(const CScript& b)
- {
- // I'm not sure if this should push the script or concatenate scripts.
- // If there's ever a use for pushing a script onto a script, delete this member fn
- assert(!"Warning: Pushing a CScript onto a CScript with << is probably not intended, use + to concatenate!");
- return *this;
- }
-
-
- bool GetOp(iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet)
- {
- // Wrapper so it can be called with either iterator or const_iterator
- const_iterator pc2 = pc;
- bool fRet = GetOp2(pc2, opcodeRet, &vchRet);
- pc = begin() + (pc2 - begin());
- return fRet;
- }
-
- bool GetOp(iterator& pc, opcodetype& opcodeRet)
- {
- const_iterator pc2 = pc;
- bool fRet = GetOp2(pc2, opcodeRet, NULL);
- pc = begin() + (pc2 - begin());
- return fRet;
- }
-
- bool GetOp(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>& vchRet) const
- {
- return GetOp2(pc, opcodeRet, &vchRet);
- }
-
- bool GetOp(const_iterator& pc, opcodetype& opcodeRet) const
- {
- return GetOp2(pc, opcodeRet, NULL);
- }
-
- bool GetOp2(const_iterator& pc, opcodetype& opcodeRet, std::vector<unsigned char>* pvchRet) const
- {
- opcodeRet = OP_INVALIDOPCODE;
- if (pvchRet)
- pvchRet->clear();
- if (pc >= end())
- return false;
-
- // Read instruction
- if (end() - pc < 1)
- return false;
- unsigned int opcode = *pc++;
-
- // Immediate operand
- if (opcode <= OP_PUSHDATA4)
- {
- unsigned int nSize = 0;
- if (opcode < OP_PUSHDATA1)
- {
- nSize = opcode;
- }
- else if (opcode == OP_PUSHDATA1)
- {
- if (end() - pc < 1)
- return false;
- nSize = *pc++;
- }
- else if (opcode == OP_PUSHDATA2)
- {
- if (end() - pc < 2)
- return false;
- nSize = 0;
- memcpy(&nSize, &pc[0], 2);
- pc += 2;
- }
- else if (opcode == OP_PUSHDATA4)
- {
- if (end() - pc < 4)
- return false;
- memcpy(&nSize, &pc[0], 4);
- pc += 4;
- }
- if (end() - pc < 0 || (unsigned int)(end() - pc) < nSize)
- return false;
- if (pvchRet)
- pvchRet->assign(pc, pc + nSize);
- pc += nSize;
- }
-
- opcodeRet = (opcodetype)opcode;
- return true;
- }
-
- // Encode/decode small integers:
- static int DecodeOP_N(opcodetype opcode)
- {
- if (opcode == OP_0)
- return 0;
- assert(opcode >= OP_1 && opcode <= OP_16);
- return (int)opcode - (int)(OP_1 - 1);
- }
- static opcodetype EncodeOP_N(int n)
- {
- assert(n >= 0 && n <= 16);
- if (n == 0)
- return OP_0;
- return (opcodetype)(OP_1+n-1);
- }
-
- int FindAndDelete(const CScript& b)
- {
- int nFound = 0;
- if (b.empty())
- return nFound;
- iterator pc = begin();
- opcodetype opcode;
- do
- {
- while (end() - pc >= (long)b.size() && memcmp(&pc[0], &b[0], b.size()) == 0)
- {
- erase(pc, pc + b.size());
- ++nFound;
- }
- }
- while (GetOp(pc, opcode));
- return nFound;
- }
- int Find(opcodetype op) const
- {
- int nFound = 0;
- opcodetype opcode;
- for (const_iterator pc = begin(); pc != end() && GetOp(pc, opcode);)
- if (opcode == op)
- ++nFound;
- return nFound;
- }
-
- // Pre-version-0.6, Bitcoin always counted CHECKMULTISIGs
- // as 20 sigops. With pay-to-script-hash, that changed:
- // CHECKMULTISIGs serialized in scriptSigs are
- // counted more accurately, assuming they are of the form
- // ... OP_N CHECKMULTISIG ...
- unsigned int GetSigOpCount(bool fAccurate) const;
-
- // Accurately count sigOps, including sigOps in
- // pay-to-script-hash transactions:
- unsigned int GetSigOpCount(const CScript& scriptSig) const;
-
- bool IsPayToScriptHash() const;
-
- // Called by IsStandardTx and P2SH VerifyScript (which makes it consensus-critical).
- bool IsPushOnly() const;
-
- // Called by IsStandardTx.
- bool HasCanonicalPushes() const;
-
- // Returns whether the script is guaranteed to fail at execution,
- // regardless of the initial stack. This allows outputs to be pruned
- // instantly when entering the UTXO set.
- bool IsUnspendable() const
- {
- return (size() > 0 && *begin() == OP_RETURN);
- }
-
- void SetDestination(const CTxDestination& address);
- void SetMultisig(int nRequired, const std::vector<CPubKey>& keys);
-
- std::string ToString() const
- {
- std::string str;
- opcodetype opcode;
- std::vector<unsigned char> vch;
- const_iterator pc = begin();
- while (pc < end())
- {
- if (!str.empty())
- str += " ";
- if (!GetOp(pc, opcode, vch))
- {
- str += "[error]";
- return str;
- }
- if (0 <= opcode && opcode <= OP_PUSHDATA4)
- str += ValueString(vch);
- else
- str += GetOpName(opcode);
- }
- return str;
- }
-
- CScriptID GetID() const
- {
- return CScriptID(Hash160(*this));
- }
-
- void clear()
- {
- // The default std::vector::clear() does not release memory.
- std::vector<unsigned char>().swap(*this);
- }
-};
-
-/** 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));
- }
-};
-
-bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey, unsigned int flags);
-bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig, unsigned int flags);
-
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
-bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
-int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
-bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
-isminetype IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
-isminetype IsMine(const CKeyStore& keystore, const CTxDestination& dest);
-void ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys);
-bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
-bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
-bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
-bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CMutableTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType);
-
-// Given two sets of signatures for scriptPubKey, possibly with OP_0 placeholders,
-// combine them intelligently and return the result.
-CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn, const CScript& scriptSig1, const CScript& scriptSig2);
-
-#endif // H_BITCOIN_SCRIPT