Browse Source

Merge pull request #4076

397668e Deduplicate uint* comparison operator logic (Pieter Wuille)
df9eb5e Move {Get,Set}Compact from bignum to uint256 (Pieter Wuille)
a703150 Add multiplication and division to uint160/uint256 (Pieter Wuille)
4d480c8 Exception instead of assigning 0 in case of wrong vector length (Pieter Wuille)
eb2cbd7 Deduplicate shared code between uint160 and uint256 (Pieter Wuille)
0.10
Wladimir J. van der Laan 11 years ago
parent
commit
8bcfccbc2d
No known key found for this signature in database
GPG Key ID: 74810B012346C9A6
  1. 65
      src/bignum.h
  2. 4
      src/chainparams.cpp
  3. 4
      src/chainparams.h
  4. 43
      src/main.cpp
  5. 17
      src/main.h
  6. 6
      src/miner.cpp
  7. 4
      src/rpcmining.cpp
  8. 4
      src/test/DoS_tests.cpp
  9. 88
      src/test/bignum_tests.cpp
  10. 210
      src/test/uint256_tests.cpp
  11. 6
      src/txdb.cpp
  12. 2
      src/txdb.h
  13. 528
      src/uint256.h

65
src/bignum.h

@ -269,71 +269,6 @@ public: @@ -269,71 +269,6 @@ public:
return vch;
}
// The "compact" format is a representation of a whole
// number N using an unsigned 32bit number similar to a
// floating point format.
// The most significant 8 bits are the unsigned exponent of base 256.
// This exponent can be thought of as "number of bytes of N".
// The lower 23 bits are the mantissa.
// Bit number 24 (0x800000) represents the sign of N.
// N = (-1^sign) * mantissa * 256^(exponent-3)
//
// Satoshi's original implementation used BN_bn2mpi() and BN_mpi2bn().
// MPI uses the most significant bit of the first byte as sign.
// Thus 0x1234560000 is compact (0x05123456)
// and 0xc0de000000 is compact (0x0600c0de)
// (0x05c0de00) would be -0x40de000000
//
// Bitcoin only uses this "compact" format for encoding difficulty
// targets, which are unsigned 256bit quantities. Thus, all the
// complexities of the sign bit and using base 256 are probably an
// implementation accident.
//
// This implementation directly uses shifts instead of going
// through an intermediate MPI representation.
CBigNum& SetCompact(unsigned int nCompact)
{
unsigned int nSize = nCompact >> 24;
bool fNegative =(nCompact & 0x00800000) != 0;
unsigned int nWord = nCompact & 0x007fffff;
if (nSize <= 3)
{
nWord >>= 8*(3-nSize);
BN_set_word(this, nWord);
}
else
{
BN_set_word(this, nWord);
BN_lshift(this, this, 8*(nSize-3));
}
BN_set_negative(this, fNegative);
return *this;
}
unsigned int GetCompact() const
{
unsigned int nSize = BN_num_bytes(this);
unsigned int nCompact = 0;
if (nSize <= 3)
nCompact = BN_get_word(this) << 8*(3-nSize);
else
{
CBigNum bn;
BN_rshift(&bn, this, 8*(nSize-3));
nCompact = BN_get_word(&bn);
}
// The 0x00800000 bit denotes the sign.
// Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
if (nCompact & 0x00800000)
{
nCompact >>= 8;
nSize++;
}
nCompact |= nSize << 24;
nCompact |= (BN_is_negative(this) ? 0x00800000 : 0);
return nCompact;
}
void SetHex(const std::string& str)
{
// skip 0x

4
src/chainparams.cpp

@ -110,7 +110,7 @@ public: @@ -110,7 +110,7 @@ public:
vAlertPubKey = ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284");
nDefaultPort = 8333;
nRPCPort = 8332;
bnProofOfWorkLimit = CBigNum(~uint256(0) >> 32);
bnProofOfWorkLimit = ~uint256(0) >> 32;
nSubsidyHalvingInterval = 210000;
// Build the genesis block. Note that the output of the genesis coinbase cannot
@ -233,7 +233,7 @@ public: @@ -233,7 +233,7 @@ public:
pchMessageStart[2] = 0xb5;
pchMessageStart[3] = 0xda;
nSubsidyHalvingInterval = 150;
bnProofOfWorkLimit = CBigNum(~uint256(0) >> 1);
bnProofOfWorkLimit = ~uint256(0) >> 1;
genesis.nTime = 1296688602;
genesis.nBits = 0x207fffff;
genesis.nNonce = 2;

4
src/chainparams.h

@ -56,7 +56,7 @@ public: @@ -56,7 +56,7 @@ public:
const MessageStartChars& MessageStart() const { return pchMessageStart; }
const vector<unsigned char>& AlertKey() const { return vAlertPubKey; }
int GetDefaultPort() const { return nDefaultPort; }
const CBigNum& ProofOfWorkLimit() const { return bnProofOfWorkLimit; }
const uint256& ProofOfWorkLimit() const { return bnProofOfWorkLimit; }
int SubsidyHalvingInterval() const { return nSubsidyHalvingInterval; }
virtual const CBlock& GenesisBlock() const = 0;
virtual bool RequireRPCPassword() const { return true; }
@ -75,7 +75,7 @@ protected: @@ -75,7 +75,7 @@ protected:
vector<unsigned char> vAlertPubKey;
int nDefaultPort;
int nRPCPort;
CBigNum bnProofOfWorkLimit;
uint256 bnProofOfWorkLimit;
int nSubsidyHalvingInterval;
string strDataDir;
vector<CDNSSeedData> vSeeds;

43
src/main.cpp

@ -1207,13 +1207,13 @@ static const int64_t nInterval = nTargetTimespan / nTargetSpacing; @@ -1207,13 +1207,13 @@ static const int64_t nInterval = nTargetTimespan / nTargetSpacing;
//
unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime)
{
const CBigNum &bnLimit = Params().ProofOfWorkLimit();
const uint256 &bnLimit = Params().ProofOfWorkLimit();
// Testnet has min-difficulty blocks
// after nTargetSpacing*2 time between blocks:
if (TestNet() && nTime > nTargetSpacing*2)
return bnLimit.GetCompact();
CBigNum bnResult;
uint256 bnResult;
bnResult.SetCompact(nBase);
while (nTime > 0 && bnResult < bnLimit)
{
@ -1272,8 +1272,10 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead @@ -1272,8 +1272,10 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
uint256 bnNew;
uint256 bnOld;
bnNew.SetCompact(pindexLast->nBits);
bnOld = bnNew;
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
@ -1283,23 +1285,25 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead @@ -1283,23 +1285,25 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
/// debug print
LogPrintf("GetNextWorkRequired RETARGET\n");
LogPrintf("nTargetTimespan = %d nActualTimespan = %d\n", nTargetTimespan, nActualTimespan);
LogPrintf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString());
LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString());
LogPrintf("Before: %08x %s\n", pindexLast->nBits, bnOld.ToString());
LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.ToString());
return bnNew.GetCompact();
}
bool CheckProofOfWork(uint256 hash, unsigned int nBits)
{
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
bool fNegative;
bool fOverflow;
uint256 bnTarget;
bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
// Check range
if (bnTarget <= 0 || bnTarget > Params().ProofOfWorkLimit())
if (fNegative || bnTarget == 0 || fOverflow || bnTarget > Params().ProofOfWorkLimit())
return error("CheckProofOfWork() : nBits below minimum work");
// Check proof of work matches claimed amount
if (hash > bnTarget.getuint256())
if (hash > bnTarget)
return error("CheckProofOfWork() : hash doesn't match nBits");
return true;
@ -1338,7 +1342,7 @@ void CheckForkWarningConditions() @@ -1338,7 +1342,7 @@ void CheckForkWarningConditions()
if (pindexBestForkTip && chainActive.Height() - pindexBestForkTip->nHeight >= 72)
pindexBestForkTip = NULL;
if (pindexBestForkTip || (pindexBestInvalid && pindexBestInvalid->nChainWork > chainActive.Tip()->nChainWork + (chainActive.Tip()->GetBlockWork() * 6).getuint256()))
if (pindexBestForkTip || (pindexBestInvalid && pindexBestInvalid->nChainWork > chainActive.Tip()->nChainWork + (chainActive.Tip()->GetBlockWork() * 6)))
{
if (!fLargeWorkForkFound)
{
@ -1394,7 +1398,7 @@ void CheckForkWarningConditionsOnNewFork(CBlockIndex* pindexNewForkTip) @@ -1394,7 +1398,7 @@ void CheckForkWarningConditionsOnNewFork(CBlockIndex* pindexNewForkTip)
// We define it this way because it allows us to only store the highest fork tip (+ base) which meets
// the 7-block condition and from this always have the most-likely-to-cause-warning fork
if (pfork && (!pindexBestForkTip || (pindexBestForkTip && pindexNewForkTip->nHeight > pindexBestForkTip->nHeight)) &&
pindexNewForkTip->nChainWork - pfork->nChainWork > (pfork->GetBlockWork() * 7).getuint256() &&
pindexNewForkTip->nChainWork - pfork->nChainWork > (pfork->GetBlockWork() * 7) &&
chainActive.Height() - pindexNewForkTip->nHeight < 72)
{
pindexBestForkTip = pindexNewForkTip;
@ -1428,10 +1432,6 @@ void static InvalidChainFound(CBlockIndex* pindexNew) @@ -1428,10 +1432,6 @@ void static InvalidChainFound(CBlockIndex* pindexNew)
if (!pindexBestInvalid || pindexNew->nChainWork > pindexBestInvalid->nChainWork)
{
pindexBestInvalid = pindexNew;
// The current code doesn't actually read the BestInvalidWork entry in
// the block database anymore, as it is derived from the flags in block
// index entry. We only write it for backward compatibility.
pblocktree->WriteBestInvalidWork(CBigNum(pindexBestInvalid->nChainWork));
uiInterface.NotifyBlocksChanged();
}
LogPrintf("InvalidChainFound: invalid block=%s height=%d log2_work=%.8g date=%s\n",
@ -2174,7 +2174,7 @@ CBlockIndex* AddToBlockIndex(CBlockHeader& block) @@ -2174,7 +2174,7 @@ CBlockIndex* AddToBlockIndex(CBlockHeader& block)
pindexNew->pprev = (*miPrev).second;
pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
}
pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + pindexNew->GetBlockWork().getuint256();
pindexNew->nChainWork = (pindexNew->pprev ? pindexNew->pprev->nChainWork : 0) + pindexNew->GetBlockWork();
pindexNew->RaiseValidity(BLOCK_VALID_TREE);
return pindexNew;
@ -2351,11 +2351,12 @@ bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool f @@ -2351,11 +2351,12 @@ bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool f
return state.DoS(100, error("CheckBlockHeader() : block with timestamp before last checkpoint"),
REJECT_CHECKPOINT, "time-too-old");
}
CBigNum bnNewBlock;
bnNewBlock.SetCompact(block.nBits);
CBigNum bnRequired;
bool fOverflow = false;
uint256 bnNewBlock;
bnNewBlock.SetCompact(block.nBits, NULL, &fOverflow);
uint256 bnRequired;
bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
if (bnNewBlock > bnRequired)
if (fOverflow || bnNewBlock > bnRequired)
{
return state.DoS(100, error("CheckBlockHeader() : block with too little proof-of-work"),
REJECT_INVALID, "bad-diffbits");
@ -2926,7 +2927,7 @@ bool static LoadBlockIndexDB() @@ -2926,7 +2927,7 @@ bool static LoadBlockIndexDB()
BOOST_FOREACH(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
{
CBlockIndex* pindex = item.second;
pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + pindex->GetBlockWork().getuint256();
pindex->nChainWork = (pindex->pprev ? pindex->pprev->nChainWork : 0) + pindex->GetBlockWork();
pindex->nChainTx = (pindex->pprev ? pindex->pprev->nChainTx : 0) + pindex->nTx;
if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS))
setBlockIndexValid.insert(pindex);

17
src/main.h

@ -10,7 +10,6 @@ @@ -10,7 +10,6 @@
#include "bitcoin-config.h"
#endif
#include "bignum.h"
#include "chainparams.h"
#include "coins.h"
#include "core.h"
@ -814,13 +813,19 @@ public: @@ -814,13 +813,19 @@ public:
return (int64_t)nTime;
}
CBigNum GetBlockWork() const
uint256 GetBlockWork() const
{
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
if (bnTarget <= 0)
uint256 bnTarget;
bool fNegative;
bool fOverflow;
bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
if (fNegative || fOverflow || bnTarget == 0)
return 0;
return (CBigNum(1)<<256) / (bnTarget+1);
// We need to compute 2**256 / (bnTarget+1), but we can't represent 2**256
// as it's too large for a uint256. However, as 2**256 is at least as large
// as bnTarget+1, it is equal to ((2**256 - bnTarget - 1) / (bnTarget+1)) + 1,
// or ~bnTarget / (nTarget+1) + 1.
return (~bnTarget / (bnTarget + 1)) + 1;
}
bool CheckIndex() const

6
src/miner.cpp

@ -466,7 +466,7 @@ CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey) @@ -466,7 +466,7 @@ CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey)
bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
{
uint256 hash = pblock->GetHash();
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
uint256 hashTarget = uint256().SetCompact(pblock->nBits);
if (hash > hashTarget)
return false;
@ -552,7 +552,7 @@ void static BitcoinMiner(CWallet *pwallet) @@ -552,7 +552,7 @@ void static BitcoinMiner(CWallet *pwallet)
// Search
//
int64_t nStart = GetTime();
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
uint256 hashTarget = uint256().SetCompact(pblock->nBits);
uint256 hashbuf[2];
uint256& hash = *alignup<16>(hashbuf);
while (true)
@ -636,7 +636,7 @@ void static BitcoinMiner(CWallet *pwallet) @@ -636,7 +636,7 @@ void static BitcoinMiner(CWallet *pwallet)
{
// Changing pblock->nTime can change work required on testnet:
nBlockBits = ByteReverse(pblock->nBits);
hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
hashTarget.SetCompact(pblock->nBits);
}
}
} }

4
src/rpcmining.cpp

@ -363,7 +363,7 @@ Value getwork(const Array& params, bool fHelp) @@ -363,7 +363,7 @@ Value getwork(const Array& params, bool fHelp)
char phash1[64];
FormatHashBuffers(pblock, pmidstate, pdata, phash1);
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
uint256 hashTarget = uint256().SetCompact(pblock->nBits);
Object result;
result.push_back(Pair("midstate", HexStr(BEGIN(pmidstate), END(pmidstate)))); // deprecated
@ -559,7 +559,7 @@ Value getblocktemplate(const Array& params, bool fHelp) @@ -559,7 +559,7 @@ Value getblocktemplate(const Array& params, bool fHelp)
Object aux;
aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
uint256 hashTarget = uint256().SetCompact(pblock->nBits);
static Array aMutable;
if (aMutable.empty())

4
src/test/DoS_tests.cpp

@ -106,9 +106,9 @@ static bool CheckNBits(unsigned int nbits1, int64_t time1, unsigned int nbits2, @@ -106,9 +106,9 @@ static bool CheckNBits(unsigned int nbits1, int64_t time1, unsigned int nbits2,
return CheckNBits(nbits2, time2, nbits1, time1);
int64_t deltaTime = time2-time1;
CBigNum required;
uint256 required;
required.SetCompact(ComputeMinWork(nbits1, deltaTime));
CBigNum have;
uint256 have;
have.SetCompact(nbits2);
return (have <= required);
}

88
src/test/bignum_tests.cpp

@ -125,94 +125,6 @@ BOOST_AUTO_TEST_CASE(bignum_setint64) @@ -125,94 +125,6 @@ BOOST_AUTO_TEST_CASE(bignum_setint64)
}
BOOST_AUTO_TEST_CASE(bignum_SetCompact)
{
CBigNum num;
num.SetCompact(0);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x00123456);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x01003456);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x02000056);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x03000000);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x04000000);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x00923456);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x01803456);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x02800056);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x03800000);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x04800000);
BOOST_CHECK_EQUAL(num.GetHex(), "0");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
num.SetCompact(0x01123456);
BOOST_CHECK_EQUAL(num.GetHex(), "12");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x01120000U);
// Make sure that we don't generate compacts with the 0x00800000 bit set
num = 0x80;
BOOST_CHECK_EQUAL(num.GetCompact(), 0x02008000U);
num.SetCompact(0x01fedcba);
BOOST_CHECK_EQUAL(num.GetHex(), "-7e");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x01fe0000U);
num.SetCompact(0x02123456);
BOOST_CHECK_EQUAL(num.GetHex(), "1234");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x02123400U);
num.SetCompact(0x03123456);
BOOST_CHECK_EQUAL(num.GetHex(), "123456");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x03123456U);
num.SetCompact(0x04123456);
BOOST_CHECK_EQUAL(num.GetHex(), "12345600");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x04123456U);
num.SetCompact(0x04923456);
BOOST_CHECK_EQUAL(num.GetHex(), "-12345600");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x04923456U);
num.SetCompact(0x05009234);
BOOST_CHECK_EQUAL(num.GetHex(), "92340000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x05009234U);
num.SetCompact(0x20123456);
BOOST_CHECK_EQUAL(num.GetHex(), "1234560000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x20123456U);
num.SetCompact(0xff123456);
BOOST_CHECK_EQUAL(num.GetHex(), "123456000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0xff123456U);
}
BOOST_AUTO_TEST_CASE(bignum_SetHex)
{
std::string hexStr = "deecf97fd890808b9cc0f1b6a3e7a60b400f52710e6ad075b1340755bfa58cc9";

210
src/test/uint256_tests.cpp

@ -160,11 +160,11 @@ BOOST_AUTO_TEST_CASE( basics ) // constructors, equality, inequality @@ -160,11 +160,11 @@ BOOST_AUTO_TEST_CASE( basics ) // constructors, equality, inequality
tmpS = ~R2S; BOOST_CHECK(tmpS == ~R2S);
tmpS = ~MaxS; BOOST_CHECK(tmpS == ~MaxS);
// Wrong length must give 0
BOOST_CHECK(uint256(std::vector<unsigned char>(OneArray,OneArray+31)) == 0);
BOOST_CHECK(uint256(std::vector<unsigned char>(OneArray,OneArray+20)) == 0);
BOOST_CHECK(uint160(std::vector<unsigned char>(OneArray,OneArray+32)) == 0);
BOOST_CHECK(uint160(std::vector<unsigned char>(OneArray,OneArray+19)) == 0);
// Wrong length must throw exception.
BOOST_CHECK_THROW(uint256(std::vector<unsigned char>(OneArray,OneArray+31)), uint_error);
BOOST_CHECK_THROW(uint256(std::vector<unsigned char>(OneArray,OneArray+20)), uint_error);
BOOST_CHECK_THROW(uint160(std::vector<unsigned char>(OneArray,OneArray+32)), uint_error);
BOOST_CHECK_THROW(uint160(std::vector<unsigned char>(OneArray,OneArray+19)), uint_error);
}
void shiftArrayRight(unsigned char* to, const unsigned char* from, unsigned int arrayLength, unsigned int bitsToShift)
@ -482,6 +482,77 @@ BOOST_AUTO_TEST_CASE( plusMinus ) @@ -482,6 +482,77 @@ BOOST_AUTO_TEST_CASE( plusMinus )
}
BOOST_AUTO_TEST_CASE( multiply )
{
BOOST_CHECK((R1L * R1L).ToString() == "62a38c0486f01e45879d7910a7761bf30d5237e9873f9bff3642a732c4d84f10");
BOOST_CHECK((R1L * R2L).ToString() == "de37805e9986996cfba76ff6ba51c008df851987d9dd323f0e5de07760529c40");
BOOST_CHECK((R1L * ZeroL) == ZeroL);
BOOST_CHECK((R1L * OneL) == R1L);
BOOST_CHECK((R1L * MaxL) == -R1L);
BOOST_CHECK((R2L * R1L) == (R1L * R2L));
BOOST_CHECK((R2L * R2L).ToString() == "ac8c010096767d3cae5005dec28bb2b45a1d85ab7996ccd3e102a650f74ff100");
BOOST_CHECK((R2L * ZeroL) == ZeroL);
BOOST_CHECK((R2L * OneL) == R2L);
BOOST_CHECK((R2L * MaxL) == -R2L);
BOOST_CHECK((R1S * R1S).ToString() == "a7761bf30d5237e9873f9bff3642a732c4d84f10");
BOOST_CHECK((R1S * R2S).ToString() == "ba51c008df851987d9dd323f0e5de07760529c40");
BOOST_CHECK((R1S * ZeroS) == ZeroS);
BOOST_CHECK((R1S * OneS) == R1S);
BOOST_CHECK((R1S * MaxS) == -R1S);
BOOST_CHECK((R2S * R1S) == (R1S * R2S));
BOOST_CHECK((R2S * R2S).ToString() == "c28bb2b45a1d85ab7996ccd3e102a650f74ff100");
BOOST_CHECK((R2S * ZeroS) == ZeroS);
BOOST_CHECK((R2S * OneS) == R2S);
BOOST_CHECK((R2S * MaxS) == -R2S);
BOOST_CHECK(MaxL * MaxL == OneL);
BOOST_CHECK(MaxS * MaxS == OneS);
BOOST_CHECK((R1L * 0) == 0);
BOOST_CHECK((R1L * 1) == R1L);
BOOST_CHECK((R1L * 3).ToString() == "7759b1c0ed14047f961ad09b20ff83687876a0181a367b813634046f91def7d4");
BOOST_CHECK((R2L * 0x87654321UL).ToString() == "23f7816e30c4ae2017257b7a0fa64d60402f5234d46e746b61c960d09a26d070");
BOOST_CHECK((R1S * 0) == 0);
BOOST_CHECK((R1S * 1) == R1S);
BOOST_CHECK((R1S * 7).ToString() == "f7a987f3c3bf758d927f202d7e795faeff084244");
BOOST_CHECK((R2S * 0xFFFFFFFFUL).ToString() == "1c6f6c930353e17f7d6127213bb18d2883e2cd90");
}
BOOST_AUTO_TEST_CASE( divide )
{
uint256 D1L("AD7133AC1977FA2B7");
uint256 D2L("ECD751716");
BOOST_CHECK((R1L / D1L).ToString() == "00000000000000000b8ac01106981635d9ed112290f8895545a7654dde28fb3a");
BOOST_CHECK((R1L / D2L).ToString() == "000000000873ce8efec5b67150bad3aa8c5fcb70e947586153bf2cec7c37c57a");
BOOST_CHECK(R1L / OneL == R1L);
BOOST_CHECK(R1L / MaxL == ZeroL);
BOOST_CHECK(MaxL / R1L == 2);
BOOST_CHECK_THROW(R1L / ZeroL, uint_error);
BOOST_CHECK((R2L / D1L).ToString() == "000000000000000013e1665895a1cc981de6d93670105a6b3ec3b73141b3a3c5");
BOOST_CHECK((R2L / D2L).ToString() == "000000000e8f0abe753bb0afe2e9437ee85d280be60882cf0bd1aaf7fa3cc2c4");
BOOST_CHECK(R2L / OneL == R2L);
BOOST_CHECK(R2L / MaxL == ZeroL);
BOOST_CHECK(MaxL / R2L == 1);
BOOST_CHECK_THROW(R2L / ZeroL, uint_error);
uint160 D1S("D3C5EDCDEA54EB92679F0A4B4");
uint160 D2S("13037");
BOOST_CHECK((R1S / D1S).ToString() == "0000000000000000000000000db9af3beade6c02");
BOOST_CHECK((R1S / D2S).ToString() == "000098dfb6cc40ca592bf74366794f298ada205c");
BOOST_CHECK(R1S / OneS == R1S);
BOOST_CHECK(R1S / MaxS == ZeroS);
BOOST_CHECK(MaxS / R1S == 1);
BOOST_CHECK_THROW(R1S / ZeroS, uint_error);
BOOST_CHECK((R2S / D1S).ToString() == "0000000000000000000000000c5608e781182047");
BOOST_CHECK((R2S / D2S).ToString() == "00008966751b7187c3c67c1fda5cea7db2c1c069");
BOOST_CHECK(R2S / OneS == R2S);
BOOST_CHECK(R2S / MaxS == ZeroS);
BOOST_CHECK(MaxS / R2S == 1);
BOOST_CHECK_THROW(R2S / ZeroS, uint_error);
}
bool almostEqual(double d1, double d2)
{
return fabs(d1-d2) <= 4*fabs(d1)*std::numeric_limits<double>::epsilon();
@ -604,6 +675,135 @@ BOOST_AUTO_TEST_CASE( methods ) // GetHex SetHex begin() end() size() GetLow64 G @@ -604,6 +675,135 @@ BOOST_AUTO_TEST_CASE( methods ) // GetHex SetHex begin() end() size() GetLow64 G
}
}
BOOST_AUTO_TEST_CASE(bignum_SetCompact)
{
uint256 num;
bool fNegative;
bool fOverflow;
num.SetCompact(0, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x00123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x01003456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x02000056, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x03000000, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x04000000, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x00923456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x01803456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x02800056, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x03800000, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x04800000, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x01123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000000012");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x01120000U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
// Make sure that we don't generate compacts with the 0x00800000 bit set
num = 0x80;
BOOST_CHECK_EQUAL(num.GetCompact(), 0x02008000U);
num.SetCompact(0x01fedcba, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "000000000000000000000000000000000000000000000000000000000000007e");
BOOST_CHECK_EQUAL(num.GetCompact(true), 0x01fe0000U);
BOOST_CHECK_EQUAL(fNegative, true);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x02123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000001234");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x02123400U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x03123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000000123456");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x03123456U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x04123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000012345600");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x04123456U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x04923456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000012345600");
BOOST_CHECK_EQUAL(num.GetCompact(true), 0x04923456U);
BOOST_CHECK_EQUAL(fNegative, true);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x05009234, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "0000000000000000000000000000000000000000000000000000000092340000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x05009234U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0x20123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(num.GetHex(), "1234560000000000000000000000000000000000000000000000000000000000");
BOOST_CHECK_EQUAL(num.GetCompact(), 0x20123456U);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, false);
num.SetCompact(0xff123456, &fNegative, &fOverflow);
BOOST_CHECK_EQUAL(fNegative, false);
BOOST_CHECK_EQUAL(fOverflow, true);
}
BOOST_AUTO_TEST_CASE( getmaxcoverage ) // some more tests just to get 100% coverage
{
// ~R1L give a base_uint<256>

6
src/txdb.cpp

@ -73,12 +73,6 @@ bool CBlockTreeDB::WriteBlockIndex(const CDiskBlockIndex& blockindex) @@ -73,12 +73,6 @@ bool CBlockTreeDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
return Write(make_pair('b', blockindex.GetBlockHash()), blockindex);
}
bool CBlockTreeDB::WriteBestInvalidWork(const CBigNum& bnBestInvalidWork)
{
// Obsolete; only written for backward compatibility.
return Write('I', bnBestInvalidWork);
}
bool CBlockTreeDB::WriteBlockFileInfo(int nFile, const CBlockFileInfo &info) {
return Write(make_pair('f', nFile), info);
}

2
src/txdb.h

@ -14,7 +14,6 @@ @@ -14,7 +14,6 @@
#include <utility>
#include <vector>
class CBigNum;
class CCoins;
class uint256;
@ -52,7 +51,6 @@ private: @@ -52,7 +51,6 @@ private:
void operator=(const CBlockTreeDB&);
public:
bool WriteBlockIndex(const CDiskBlockIndex& blockindex);
bool WriteBestInvalidWork(const CBigNum& bnBestInvalidWork);
bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
bool WriteBlockFileInfo(int nFile, const CBlockFileInfo &fileinfo);
bool ReadLastBlockFile(int &nFile);

528
src/uint256.h

@ -1,11 +1,13 @@ @@ -1,11 +1,13 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2013 The Bitcoin developers
// Copyright (c) 2009-2014 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 BITCOIN_UINT256_H
#define BITCOIN_UINT256_H
#include <assert.h>
#include <stdexcept>
#include <stdint.h>
#include <stdio.h>
#include <string>
@ -19,17 +21,59 @@ inline signed char HexDigit(char c) @@ -19,17 +21,59 @@ inline signed char HexDigit(char c)
return p_util_hexdigit[(unsigned char)c];
}
/** Base class without constructors for uint256 and uint160.
* This makes the compiler let you use it in a union.
*/
class uint_error : public std::runtime_error {
public:
explicit uint_error(const std::string& str) : std::runtime_error(str) {}
};
/** Template base class for unsigned big integers. */
template<unsigned int BITS>
class base_uint
{
protected:
private:
enum { WIDTH=BITS/32 };
uint32_t pn[WIDTH];
public:
base_uint()
{
for (int i = 0; i < WIDTH; i++)
pn[i] = 0;
}
base_uint(const base_uint& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
}
base_uint& operator=(const base_uint& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
return *this;
}
base_uint(uint64_t b)
{
pn[0] = (unsigned int)b;
pn[1] = (unsigned int)(b >> 32);
for (int i = 2; i < WIDTH; i++)
pn[i] = 0;
}
explicit base_uint(const std::string& str)
{
SetHex(str);
}
explicit base_uint(const std::vector<unsigned char>& vch)
{
if (vch.size() != sizeof(pn))
throw uint_error("Converting vector of wrong size to base_uint");
memcpy(pn, &vch[0], sizeof(pn));
}
bool operator!() const
{
for (int i = 0; i < WIDTH; i++)
@ -178,6 +222,57 @@ public: @@ -178,6 +222,57 @@ public:
return *this;
}
base_uint& operator*=(uint32_t b32)
{
uint64_t carry = 0;
for (int i = 0; i < WIDTH; i++)
{
uint64_t n = carry + (uint64_t)b32 * pn[i];
pn[i] = n & 0xffffffff;
carry = n >> 32;
}
return *this;
}
base_uint& operator*=(const base_uint& b)
{
base_uint a = *this;
*this = 0;
for (int j = 0; j < WIDTH; j++) {
uint64_t carry = 0;
for (int i = 0; i + j < WIDTH; i++) {
uint64_t n = carry + pn[i + j] + (uint64_t)a.pn[j] * b.pn[i];
pn[i + j] = n & 0xffffffff;
carry = n >> 32;
}
}
return *this;
}
base_uint& operator/=(const base_uint& b)
{
base_uint div = b; // make a copy, so we can shift.
base_uint num = *this; // make a copy, so we can subtract.
*this = 0; // the quotient.
int num_bits = num.bits();
int div_bits = div.bits();
if (div_bits == 0)
throw uint_error("Division by zero");
if (div_bits > num_bits) // the result is certainly 0.
return *this;
int shift = num_bits - div_bits;
div <<= shift; // shift so that div and nun align.
while (shift >= 0) {
if (num >= div) {
num -= div;
pn[shift / 32] |= (1 << (shift & 31)); // set a bit of the result.
}
div >>= 1; // shift back.
shift--;
}
// num now contains the remainder of the division.
return *this;
}
base_uint& operator++()
{
@ -213,86 +308,46 @@ public: @@ -213,86 +308,46 @@ public:
return ret;
}
friend inline bool operator<(const base_uint& a, const base_uint& b)
{
for (int i = base_uint::WIDTH-1; i >= 0; i--)
{
if (a.pn[i] < b.pn[i])
return true;
else if (a.pn[i] > b.pn[i])
return false;
}
return false;
}
friend inline bool operator<=(const base_uint& a, const base_uint& b)
{
for (int i = base_uint::WIDTH-1; i >= 0; i--)
{
if (a.pn[i] < b.pn[i])
return true;
else if (a.pn[i] > b.pn[i])
return false;
int CompareTo(const base_uint& b) const {
for (int i = base_uint::WIDTH-1; i >= 0; i--) {
if (pn[i] < b.pn[i])
return -1;
if (pn[i] > b.pn[i])
return 1;
}
return true;
return 0;
}
friend inline bool operator>(const base_uint& a, const base_uint& b)
{
for (int i = base_uint::WIDTH-1; i >= 0; i--)
{
if (a.pn[i] > b.pn[i])
return true;
else if (a.pn[i] < b.pn[i])
bool EqualTo(uint64_t b) const {
for (int i = base_uint::WIDTH-1; i >= 2; i--) {
if (pn[i])
return false;
}
return false;
}
friend inline bool operator>=(const base_uint& a, const base_uint& b)
{
for (int i = base_uint::WIDTH-1; i >= 0; i--)
{
if (a.pn[i] > b.pn[i])
return true;
else if (a.pn[i] < b.pn[i])
return false;
}
return true;
}
friend inline bool operator==(const base_uint& a, const base_uint& b)
{
for (int i = 0; i < base_uint::WIDTH; i++)
if (a.pn[i] != b.pn[i])
return false;
return true;
}
friend inline bool operator==(const base_uint& a, uint64_t b)
{
if (a.pn[0] != (unsigned int)b)
if (pn[1] != (b >> 32))
return false;
if (a.pn[1] != (unsigned int)(b >> 32))
if (pn[0] != (b & 0xfffffffful))
return false;
for (int i = 2; i < base_uint::WIDTH; i++)
if (a.pn[i] != 0)
return false;
return true;
}
friend inline bool operator!=(const base_uint& a, const base_uint& b)
{
return (!(a == b));
}
friend inline bool operator!=(const base_uint& a, uint64_t b)
{
return (!(a == b));
}
friend inline const base_uint operator+(const base_uint& a, const base_uint& b) { return base_uint(a) += b; }
friend inline const base_uint operator-(const base_uint& a, const base_uint& b) { return base_uint(a) -= b; }
friend inline const base_uint operator*(const base_uint& a, const base_uint& b) { return base_uint(a) *= b; }
friend inline const base_uint operator/(const base_uint& a, const base_uint& b) { return base_uint(a) /= b; }
friend inline const base_uint operator|(const base_uint& a, const base_uint& b) { return base_uint(a) |= b; }
friend inline const base_uint operator&(const base_uint& a, const base_uint& b) { return base_uint(a) &= b; }
friend inline const base_uint operator^(const base_uint& a, const base_uint& b) { return base_uint(a) ^= b; }
friend inline const base_uint operator>>(const base_uint& a, int shift) { return base_uint(a) >>= shift; }
friend inline const base_uint operator<<(const base_uint& a, int shift) { return base_uint(a) <<= shift; }
friend inline const base_uint operator*(const base_uint& a, uint32_t b) { return base_uint(a) *= b; }
friend inline bool operator==(const base_uint& a, const base_uint& b) { return a.CompareTo(b) == 0; }
friend inline bool operator!=(const base_uint& a, const base_uint& b) { return a.CompareTo(b) != 0; }
friend inline bool operator>(const base_uint& a, const base_uint& b) { return a.CompareTo(b) > 0; }
friend inline bool operator<(const base_uint& a, const base_uint& b) { return a.CompareTo(b) < 0; }
friend inline bool operator>=(const base_uint& a, const base_uint& b) { return a.CompareTo(b) >= 0; }
friend inline bool operator<=(const base_uint& a, const base_uint& b) { return a.CompareTo(b) <= 0; }
friend inline bool operator==(const base_uint& a, uint64_t b) { return a.EqualTo(b); }
friend inline bool operator!=(const base_uint& a, uint64_t b) { return !a.EqualTo(b); }
std::string GetHex() const
{
@ -367,269 +422,134 @@ public: @@ -367,269 +422,134 @@ public:
return sizeof(pn);
}
// Returns the position of the highest bit set plus one, or zero if the
// value is zero.
unsigned int bits() const
{
for (int pos = WIDTH-1; pos >= 0; pos--) {
if (pn[pos]) {
for (int bits = 31; bits > 0; bits--) {
if (pn[pos] & 1<<bits)
return 32*pos + bits + 1;
}
return 32*pos + 1;
}
}
return 0;
}
uint64_t GetLow64() const
{
assert(WIDTH >= 2);
return pn[0] | (uint64_t)pn[1] << 32;
}
// unsigned int GetSerializeSize(int nType=0, int nVersion=PROTOCOL_VERSION) const
unsigned int GetSerializeSize(int nType, int nVersion) const
{
return sizeof(pn);
}
template<typename Stream>
// void Serialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION) const
void Serialize(Stream& s, int nType, int nVersion) const
{
s.write((char*)pn, sizeof(pn));
}
template<typename Stream>
// void Unserialize(Stream& s, int nType=0, int nVersion=PROTOCOL_VERSION)
void Unserialize(Stream& s, int nType, int nVersion)
{
s.read((char*)pn, sizeof(pn));
}
friend class uint160;
friend class uint256;
};
typedef base_uint<160> base_uint160;
typedef base_uint<256> base_uint256;
//
// uint160 and uint256 could be implemented as templates, but to keep
// compile errors and debugging cleaner, they're copy and pasted.
//
//////////////////////////////////////////////////////////////////////////////
//
// uint160
//
/** 160-bit unsigned integer */
class uint160 : public base_uint160
{
/** 160-bit unsigned big integer. */
class uint160 : public base_uint<160> {
public:
typedef base_uint160 basetype;
uint160()
{
for (int i = 0; i < WIDTH; i++)
pn[i] = 0;
}
uint160(const basetype& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
}
uint160& operator=(const basetype& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
return *this;
}
uint160(uint64_t b)
{
pn[0] = (unsigned int)b;
pn[1] = (unsigned int)(b >> 32);
for (int i = 2; i < WIDTH; i++)
pn[i] = 0;
}
uint160& operator=(uint64_t b)
{
pn[0] = (unsigned int)b;
pn[1] = (unsigned int)(b >> 32);
for (int i = 2; i < WIDTH; i++)
pn[i] = 0;
return *this;
}
explicit uint160(const std::string& str)
{
SetHex(str);
}
explicit uint160(const std::vector<unsigned char>& vch)
{
if (vch.size() == sizeof(pn))
memcpy(pn, &vch[0], sizeof(pn));
else
*this = 0;
}
uint160() {}
uint160(const base_uint<160>& b) : base_uint<160>(b) {}
uint160(uint64_t b) : base_uint<160>(b) {}
explicit uint160(const std::string& str) : base_uint<160>(str) {}
explicit uint160(const std::vector<unsigned char>& vch) : base_uint<160>(vch) {}
};
inline bool operator==(const uint160& a, uint64_t b) { return (base_uint160)a == b; }
inline bool operator!=(const uint160& a, uint64_t b) { return (base_uint160)a != b; }
inline const uint160 operator<<(const base_uint160& a, unsigned int shift) { return uint160(a) <<= shift; }
inline const uint160 operator>>(const base_uint160& a, unsigned int shift) { return uint160(a) >>= shift; }
inline const uint160 operator<<(const uint160& a, unsigned int shift) { return uint160(a) <<= shift; }
inline const uint160 operator>>(const uint160& a, unsigned int shift) { return uint160(a) >>= shift; }
inline const uint160 operator^(const base_uint160& a, const base_uint160& b) { return uint160(a) ^= b; }
inline const uint160 operator&(const base_uint160& a, const base_uint160& b) { return uint160(a) &= b; }
inline const uint160 operator|(const base_uint160& a, const base_uint160& b) { return uint160(a) |= b; }
inline const uint160 operator+(const base_uint160& a, const base_uint160& b) { return uint160(a) += b; }
inline const uint160 operator-(const base_uint160& a, const base_uint160& b) { return uint160(a) -= b; }
inline bool operator<(const base_uint160& a, const uint160& b) { return (base_uint160)a < (base_uint160)b; }
inline bool operator<=(const base_uint160& a, const uint160& b) { return (base_uint160)a <= (base_uint160)b; }
inline bool operator>(const base_uint160& a, const uint160& b) { return (base_uint160)a > (base_uint160)b; }
inline bool operator>=(const base_uint160& a, const uint160& b) { return (base_uint160)a >= (base_uint160)b; }
inline bool operator==(const base_uint160& a, const uint160& b) { return (base_uint160)a == (base_uint160)b; }
inline bool operator!=(const base_uint160& a, const uint160& b) { return (base_uint160)a != (base_uint160)b; }
inline const uint160 operator^(const base_uint160& a, const uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
inline const uint160 operator&(const base_uint160& a, const uint160& b) { return (base_uint160)a & (base_uint160)b; }
inline const uint160 operator|(const base_uint160& a, const uint160& b) { return (base_uint160)a | (base_uint160)b; }
inline const uint160 operator+(const base_uint160& a, const uint160& b) { return (base_uint160)a + (base_uint160)b; }
inline const uint160 operator-(const base_uint160& a, const uint160& b) { return (base_uint160)a - (base_uint160)b; }
inline bool operator<(const uint160& a, const base_uint160& b) { return (base_uint160)a < (base_uint160)b; }
inline bool operator<=(const uint160& a, const base_uint160& b) { return (base_uint160)a <= (base_uint160)b; }
inline bool operator>(const uint160& a, const base_uint160& b) { return (base_uint160)a > (base_uint160)b; }
inline bool operator>=(const uint160& a, const base_uint160& b) { return (base_uint160)a >= (base_uint160)b; }
inline bool operator==(const uint160& a, const base_uint160& b) { return (base_uint160)a == (base_uint160)b; }
inline bool operator!=(const uint160& a, const base_uint160& b) { return (base_uint160)a != (base_uint160)b; }
inline const uint160 operator^(const uint160& a, const base_uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
inline const uint160 operator&(const uint160& a, const base_uint160& b) { return (base_uint160)a & (base_uint160)b; }
inline const uint160 operator|(const uint160& a, const base_uint160& b) { return (base_uint160)a | (base_uint160)b; }
inline const uint160 operator+(const uint160& a, const base_uint160& b) { return (base_uint160)a + (base_uint160)b; }
inline const uint160 operator-(const uint160& a, const base_uint160& b) { return (base_uint160)a - (base_uint160)b; }
inline bool operator<(const uint160& a, const uint160& b) { return (base_uint160)a < (base_uint160)b; }
inline bool operator<=(const uint160& a, const uint160& b) { return (base_uint160)a <= (base_uint160)b; }
inline bool operator>(const uint160& a, const uint160& b) { return (base_uint160)a > (base_uint160)b; }
inline bool operator>=(const uint160& a, const uint160& b) { return (base_uint160)a >= (base_uint160)b; }
inline bool operator==(const uint160& a, const uint160& b) { return (base_uint160)a == (base_uint160)b; }
inline bool operator!=(const uint160& a, const uint160& b) { return (base_uint160)a != (base_uint160)b; }
inline const uint160 operator^(const uint160& a, const uint160& b) { return (base_uint160)a ^ (base_uint160)b; }
inline const uint160 operator&(const uint160& a, const uint160& b) { return (base_uint160)a & (base_uint160)b; }
inline const uint160 operator|(const uint160& a, const uint160& b) { return (base_uint160)a | (base_uint160)b; }
inline const uint160 operator+(const uint160& a, const uint160& b) { return (base_uint160)a + (base_uint160)b; }
inline const uint160 operator-(const uint160& a, const uint160& b) { return (base_uint160)a - (base_uint160)b; }
//////////////////////////////////////////////////////////////////////////////
//
// uint256
//
/** 256-bit unsigned integer */
class uint256 : public base_uint256
{
/** 256-bit unsigned big integer. */
class uint256 : public base_uint<256> {
public:
typedef base_uint256 basetype;
uint256()
{
for (int i = 0; i < WIDTH; i++)
pn[i] = 0;
}
uint256(const basetype& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
}
uint256& operator=(const basetype& b)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = b.pn[i];
return *this;
}
uint256(uint64_t b)
{
pn[0] = (unsigned int)b;
pn[1] = (unsigned int)(b >> 32);
for (int i = 2; i < WIDTH; i++)
pn[i] = 0;
}
uint256& operator=(uint64_t b)
{
pn[0] = (unsigned int)b;
pn[1] = (unsigned int)(b >> 32);
for (int i = 2; i < WIDTH; i++)
pn[i] = 0;
uint256() {}
uint256(const base_uint<256>& b) : base_uint<256>(b) {}
uint256(uint64_t b) : base_uint<256>(b) {}
explicit uint256(const std::string& str) : base_uint<256>(str) {}
explicit uint256(const std::vector<unsigned char>& vch) : base_uint<256>(vch) {}
// The "compact" format is a representation of a whole
// number N using an unsigned 32bit number similar to a
// floating point format.
// The most significant 8 bits are the unsigned exponent of base 256.
// This exponent can be thought of as "number of bytes of N".
// The lower 23 bits are the mantissa.
// Bit number 24 (0x800000) represents the sign of N.
// N = (-1^sign) * mantissa * 256^(exponent-3)
//
// Satoshi's original implementation used BN_bn2mpi() and BN_mpi2bn().
// MPI uses the most significant bit of the first byte as sign.
// Thus 0x1234560000 is compact (0x05123456)
// and 0xc0de000000 is compact (0x0600c0de)
// (0x05c0de00) would be -0x40de000000
//
// Bitcoin only uses this "compact" format for encoding difficulty
// targets, which are unsigned 256bit quantities. Thus, all the
// complexities of the sign bit and using base 256 are probably an
// implementation accident.
//
// This implementation directly uses shifts instead of going
// through an intermediate MPI representation.
uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL)
{
int nSize = nCompact >> 24;
uint32_t nWord = nCompact & 0x007fffff;
if (nSize <= 3)
{
nWord >>= 8*(3-nSize);
*this = nWord;
}
else
{
*this = nWord;
*this <<= 8*(nSize-3);
}
if (pfNegative)
*pfNegative = nWord != 0 && (nCompact & 0x00800000) != 0;
if (pfOverflow)
*pfOverflow = nWord != 0 && ((nSize > 34) ||
(nWord > 0xff && nSize > 33) ||
(nWord > 0xffff && nSize > 32));
return *this;
}
explicit uint256(const std::string& str)
{
SetHex(str);
}
explicit uint256(const std::vector<unsigned char>& vch)
uint32_t GetCompact(bool fNegative = false) const
{
if (vch.size() == sizeof(pn))
memcpy(pn, &vch[0], sizeof(pn));
int nSize = (bits() + 7) / 8;
uint32_t nCompact = 0;
if (nSize <= 3)
nCompact = GetLow64() << 8*(3-nSize);
else
*this = 0;
{
uint256 bn = *this >> 8*(nSize-3);
nCompact = bn.GetLow64();
}
// The 0x00800000 bit denotes the sign.
// Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
if (nCompact & 0x00800000)
{
nCompact >>= 8;
nSize++;
}
assert((nCompact & ~0x007fffff) == 0);
assert(nSize < 256);
nCompact |= nSize << 24;
nCompact |= (fNegative && (nCompact & 0x007fffff) ? 0x00800000 : 0);
return nCompact;
}
};
inline bool operator==(const uint256& a, uint64_t b) { return (base_uint256)a == b; }
inline bool operator!=(const uint256& a, uint64_t b) { return (base_uint256)a != b; }
inline const uint256 operator<<(const base_uint256& a, unsigned int shift) { return uint256(a) <<= shift; }
inline const uint256 operator>>(const base_uint256& a, unsigned int shift) { return uint256(a) >>= shift; }
inline const uint256 operator<<(const uint256& a, unsigned int shift) { return uint256(a) <<= shift; }
inline const uint256 operator>>(const uint256& a, unsigned int shift) { return uint256(a) >>= shift; }
inline const uint256 operator^(const base_uint256& a, const base_uint256& b) { return uint256(a) ^= b; }
inline const uint256 operator&(const base_uint256& a, const base_uint256& b) { return uint256(a) &= b; }
inline const uint256 operator|(const base_uint256& a, const base_uint256& b) { return uint256(a) |= b; }
inline const uint256 operator+(const base_uint256& a, const base_uint256& b) { return uint256(a) += b; }
inline const uint256 operator-(const base_uint256& a, const base_uint256& b) { return uint256(a) -= b; }
inline bool operator<(const base_uint256& a, const uint256& b) { return (base_uint256)a < (base_uint256)b; }
inline bool operator<=(const base_uint256& a, const uint256& b) { return (base_uint256)a <= (base_uint256)b; }
inline bool operator>(const base_uint256& a, const uint256& b) { return (base_uint256)a > (base_uint256)b; }
inline bool operator>=(const base_uint256& a, const uint256& b) { return (base_uint256)a >= (base_uint256)b; }
inline bool operator==(const base_uint256& a, const uint256& b) { return (base_uint256)a == (base_uint256)b; }
inline bool operator!=(const base_uint256& a, const uint256& b) { return (base_uint256)a != (base_uint256)b; }
inline const uint256 operator^(const base_uint256& a, const uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
inline const uint256 operator&(const base_uint256& a, const uint256& b) { return (base_uint256)a & (base_uint256)b; }
inline const uint256 operator|(const base_uint256& a, const uint256& b) { return (base_uint256)a | (base_uint256)b; }
inline const uint256 operator+(const base_uint256& a, const uint256& b) { return (base_uint256)a + (base_uint256)b; }
inline const uint256 operator-(const base_uint256& a, const uint256& b) { return (base_uint256)a - (base_uint256)b; }
inline bool operator<(const uint256& a, const base_uint256& b) { return (base_uint256)a < (base_uint256)b; }
inline bool operator<=(const uint256& a, const base_uint256& b) { return (base_uint256)a <= (base_uint256)b; }
inline bool operator>(const uint256& a, const base_uint256& b) { return (base_uint256)a > (base_uint256)b; }
inline bool operator>=(const uint256& a, const base_uint256& b) { return (base_uint256)a >= (base_uint256)b; }
inline bool operator==(const uint256& a, const base_uint256& b) { return (base_uint256)a == (base_uint256)b; }
inline bool operator!=(const uint256& a, const base_uint256& b) { return (base_uint256)a != (base_uint256)b; }
inline const uint256 operator^(const uint256& a, const base_uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
inline const uint256 operator&(const uint256& a, const base_uint256& b) { return (base_uint256)a & (base_uint256)b; }
inline const uint256 operator|(const uint256& a, const base_uint256& b) { return (base_uint256)a | (base_uint256)b; }
inline const uint256 operator+(const uint256& a, const base_uint256& b) { return (base_uint256)a + (base_uint256)b; }
inline const uint256 operator-(const uint256& a, const base_uint256& b) { return (base_uint256)a - (base_uint256)b; }
inline bool operator<(const uint256& a, const uint256& b) { return (base_uint256)a < (base_uint256)b; }
inline bool operator<=(const uint256& a, const uint256& b) { return (base_uint256)a <= (base_uint256)b; }
inline bool operator>(const uint256& a, const uint256& b) { return (base_uint256)a > (base_uint256)b; }
inline bool operator>=(const uint256& a, const uint256& b) { return (base_uint256)a >= (base_uint256)b; }
inline bool operator==(const uint256& a, const uint256& b) { return (base_uint256)a == (base_uint256)b; }
inline bool operator!=(const uint256& a, const uint256& b) { return (base_uint256)a != (base_uint256)b; }
inline const uint256 operator^(const uint256& a, const uint256& b) { return (base_uint256)a ^ (base_uint256)b; }
inline const uint256 operator&(const uint256& a, const uint256& b) { return (base_uint256)a & (base_uint256)b; }
inline const uint256 operator|(const uint256& a, const uint256& b) { return (base_uint256)a | (base_uint256)b; }
inline const uint256 operator+(const uint256& a, const uint256& b) { return (base_uint256)a + (base_uint256)b; }
inline const uint256 operator-(const uint256& a, const uint256& b) { return (base_uint256)a - (base_uint256)b; }
#endif

Loading…
Cancel
Save