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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h"
0 ?0 J, l0 T6 Q5 W7 ]1 W4 z#include <vector>
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using namespace std; 1 e) ?# R% ?* g% [) R" U: a
5 G4 ]5 B% m5 c3 I( _3 Qchar intToHexChar(int x) { 6 g! c* g5 ^3 r" W+ e1 g. I* ^
static const char HEX[16] = {
, i1 k' s! I% s! ^ '0', '1', '2', '3',
2 n7 }8 v' ]0 ?& @4 V1 H* G9 R* q '4', '5', '6', '7', 8 e0 ^' V0 ]) ?
'8', '9', 'A', 'B',
" R! \3 T+ w" b. \+ z; d3 e1 c$ U 'C', 'D', 'E', 'F' 5 C- M: K' T5 @$ B+ C) b
}; % d V; V0 i9 v# ~9 j
return HEX[x]; 5 }& v0 W: L# o/ |+ L: F
} ) c3 G! t% ^( \7 D2 O0 D* K
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int hexCharToInt(char hex) {
: Q( v, Z' |& x8 m. G9 n: r I hex = toupper(hex); 9 Z5 i: Q8 {0 @
if (isdigit(hex)) / O6 o( F: G/ g% p9 Z8 l
return (hex - '0');
5 ]# X' C! H% m# |0 }1 A8 @1 y if (isalpha(hex))
' L6 `0 S% |( z3 `% w# s return (hex - 'A' + 10);
& U2 R+ v+ U3 b( p0 i) S2 y return 0;
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string bytesToHexString(const byte *in, size_t size) { ; R. c; P" I6 B( b5 P
string str;
9 t& f" m6 l& Y, ^7 u% V" T for (size_t i = 0; i < size; ++i) { 1 r. [ k, G3 |! ], F; [7 |5 K
int t = in[i];
. c$ A. s" g" W/ w. S$ |) ` T int a = t / 16; 5 ~, S$ `; K8 V- }, N5 r
int b = t % 16;
9 A; b& R# K: f8 _3 P4 e str.append(1, intToHexChar(a));
' c% u" G4 m2 v2 b0 L2 [# \ str.append(1, intToHexChar(b)); 1 c8 `+ W0 g, ^. ?9 j9 d
if (i != size - 1)
* A5 S2 Z& ?0 ?" b4 U$ C str.append(1, ' '); 3 v9 I1 B z) F: Q! c/ {
}
# k: L. c1 ]& |& [ return str;
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size_t hexStringToBytes(const string &str, byte *out) { 7 u+ {' u$ ?; k% m+ t9 w. ^
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vector<string> vec;
' w$ p2 |. s0 d string::size_type currPos = 0, prevPos = 0;
. Q9 _5 [% S# I# h while ((currPos = str.find(' ', prevPos)) != string::npos) {
% E' t2 g5 E9 Y) _5 \ string b(str.substr(prevPos, currPos - prevPos)); + A; U! k! E L7 P* m: J. h
vec.push_back(b);
/ \" M, O. Z8 Z, ?# S6 d prevPos = currPos + 1;
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3 L, m+ N! b9 P6 g/ z5 t if (prevPos < str.size()) { 5 g0 I) |7 q! T9 C: \' \& w% d: _
string b(str.substr(prevPos));
; Y( \( h: u2 ]7 q( P1 n8 a! p vec.push_back(b);
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typedef vector<string>::size_type sz_type; 2 q' A4 J& U' V; M- J8 V* h% b8 n
sz_type size = vec.size(); * W! u" i; _+ o* Y4 m. |, H2 w
for (sz_type i = 0; i < size; ++i) { 3 L# G& h- @* N7 l( u( H
int a = hexCharToInt(vec[i][0]);
0 s( [! f. H: H int b = hexCharToInt(vec[i][1]);
0 R( L/ ]: ^: a9 H8 ]& y8 s out[i] = a * 16 + b; ! X! N! H. M+ q" R' H1 e
}
5 l' e0 B" y7 c) `( ~ return size; 7 P* p, k' \- Y' M3 B' Q4 x
} |
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