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Merge pull request #3076 from lano1106/uint256_util

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Make util phexdigit array reusable
This commit is contained in:
Wladimir J. van der Laan
2013-11-04 05:55:37 -08:00
parent 97f844dd95 f171ec0c7d
commit bac72640ee
5 changed files with 34 additions and 14 deletions
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15
src/uint256.h
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@@ -14,7 +14,12 @@
typedef long long int64;
typedef unsigned long long uint64;
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];
}
inline int Testuint256AdHoc(std::vector<std::string> vArg);
@@ -305,8 +310,7 @@ public:
void SetHex(const char* psz)
{
for (int i = 0; i < WIDTH; i++)
pn[i] = 0;
memset(pn,0,sizeof(pn));
// skip leading spaces
while (isspace(*psz))
@@ -317,19 +321,18 @@ public:
psz += 2;
// hex string to uint
static const unsigned char phexdigit[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0xa,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0,0,0,0,0 };
const char* pbegin = psz;
while (phexdigit[(unsigned char)*psz] || *psz == '0')
while (::HexDigit(*psz) != -1)
psz++;
psz--;
unsigned char* p1 = (unsigned char*)pn;
unsigned char* pend = p1 + WIDTH * 4;
while (psz >= pbegin && p1 < pend)
{
*p1 = phexdigit[(unsigned char)*psz--];
*p1 = ::HexDigit(*psz--);
if (psz >= pbegin)
{
*p1 |= (phexdigit[(unsigned char)*psz--] << 4);
*p1 |= ((unsigned char)::HexDigit(*psz--) << 4);
p1++;
}
}