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-rw-r--r--src/uint256.h262
1 files changed, 17 insertions, 245 deletions
diff --git a/src/uint256.h b/src/uint256.h
index 1acedd14bf..82db7758c9 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -9,18 +9,9 @@
#include <assert.h>
#include <stdexcept>
#include <stdint.h>
-#include <stdio.h>
#include <string>
-#include <string.h>
#include <vector>
-extern const signed char p_util_hexdigit[256]; // defined in util.cpp
-
-inline signed char HexDigit(char c)
-{
- return p_util_hexdigit[(unsigned char)c];
-}
-
class uint_error : public std::runtime_error {
public:
explicit uint_error(const std::string& str) : std::runtime_error(str) {}
@@ -62,17 +53,8 @@ public:
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));
- }
+ explicit base_uint(const std::string& str);
+ explicit base_uint(const std::vector<unsigned char>& vch);
bool operator!() const
{
@@ -99,16 +81,7 @@ public:
return ret;
}
- double getdouble() const
- {
- double ret = 0.0;
- double fact = 1.0;
- for (int i = 0; i < WIDTH; i++) {
- ret += fact * pn[i];
- fact *= 4294967296.0;
- }
- return ret;
- }
+ double getdouble() const;
base_uint& operator=(uint64_t b)
{
@@ -154,39 +127,8 @@ public:
return *this;
}
- base_uint& operator<<=(unsigned int shift)
- {
- base_uint a(*this);
- for (int i = 0; i < WIDTH; i++)
- pn[i] = 0;
- int k = shift / 32;
- shift = shift % 32;
- for (int i = 0; i < WIDTH; i++)
- {
- if (i+k+1 < WIDTH && shift != 0)
- pn[i+k+1] |= (a.pn[i] >> (32-shift));
- if (i+k < WIDTH)
- pn[i+k] |= (a.pn[i] << shift);
- }
- return *this;
- }
-
- base_uint& operator>>=(unsigned int shift)
- {
- base_uint a(*this);
- for (int i = 0; i < WIDTH; i++)
- pn[i] = 0;
- int k = shift / 32;
- shift = shift % 32;
- for (int i = 0; i < WIDTH; i++)
- {
- if (i-k-1 >= 0 && shift != 0)
- pn[i-k-1] |= (a.pn[i] << (32-shift));
- if (i-k >= 0)
- pn[i-k] |= (a.pn[i] >> shift);
- }
- return *this;
- }
+ base_uint& operator<<=(unsigned int shift);
+ base_uint& operator>>=(unsigned int shift);
base_uint& operator+=(const base_uint& b)
{
@@ -222,57 +164,9 @@ 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*=(uint32_t b32);
+ base_uint& operator*=(const base_uint& b);
+ base_uint& operator/=(const base_uint& b);
base_uint& operator++()
{
@@ -308,27 +202,8 @@ public:
return ret;
}
- 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 0;
- }
-
- bool EqualTo(uint64_t b) const {
- for (int i = base_uint::WIDTH-1; i >= 2; i--) {
- if (pn[i])
- return false;
- }
- if (pn[1] != (b >> 32))
- return false;
- if (pn[0] != (b & 0xfffffffful))
- return false;
- return true;
- }
+ int CompareTo(const base_uint& b) const;
+ bool EqualTo(uint64_t b) const;
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; }
@@ -349,53 +224,10 @@ public:
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
- {
- char psz[sizeof(pn)*2 + 1];
- for (unsigned int i = 0; i < sizeof(pn); i++)
- sprintf(psz + i*2, "%02x", ((unsigned char*)pn)[sizeof(pn) - i - 1]);
- return std::string(psz, psz + sizeof(pn)*2);
- }
-
- void SetHex(const char* psz)
- {
- memset(pn,0,sizeof(pn));
-
- // skip leading spaces
- while (isspace(*psz))
- psz++;
-
- // skip 0x
- if (psz[0] == '0' && tolower(psz[1]) == 'x')
- psz += 2;
-
- // hex string to uint
- const char* pbegin = psz;
- while (::HexDigit(*psz) != -1)
- psz++;
- psz--;
- unsigned char* p1 = (unsigned char*)pn;
- unsigned char* pend = p1 + WIDTH * 4;
- while (psz >= pbegin && p1 < pend)
- {
- *p1 = ::HexDigit(*psz--);
- if (psz >= pbegin)
- {
- *p1 |= ((unsigned char)::HexDigit(*psz--) << 4);
- p1++;
- }
- }
- }
-
- void SetHex(const std::string& str)
- {
- SetHex(str.c_str());
- }
-
- std::string ToString() const
- {
- return (GetHex());
- }
+ std::string GetHex() const;
+ void SetHex(const char* psz);
+ void SetHex(const std::string& str);
+ std::string ToString() const;
unsigned char* begin()
{
@@ -424,19 +256,7 @@ public:
// 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;
- }
+ unsigned int bits() const;
uint64_t GetLow64() const
{
@@ -500,56 +320,8 @@ public:
// 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;
- }
-
- uint32_t GetCompact(bool fNegative = false) const
- {
- int nSize = (bits() + 7) / 8;
- uint32_t nCompact = 0;
- if (nSize <= 3)
- nCompact = GetLow64() << 8*(3-nSize);
- else
- {
- 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;
- }
+ uint256& SetCompact(uint32_t nCompact, bool *pfNegative = NULL, bool *pfOverflow = NULL);
+ uint32_t GetCompact(bool fNegative = false) const;
};
#endif
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-01 09:54:05 +0000