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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h"
$ c& I. \) n1 ]" M3 K#include <vector> " m J) x; i, ]& ]- E
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using namespace std; . B0 D/ t2 j* r* _
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char intToHexChar(int x) { + K, M1 {. M, |7 f* w) F1 w
static const char HEX[16] = {
. j* c1 L( \4 g: E% _# h$ { '0', '1', '2', '3', 4 p: ]% m9 |7 N8 F4 {& T
'4', '5', '6', '7',
) _5 X7 f" I/ @# x& T9 b8 U5 { '8', '9', 'A', 'B', 5 o6 a J0 s( ?, U) A I
'C', 'D', 'E', 'F'
0 _/ O# Y: [. e };
) v. H( c, Z/ ] return HEX[x];
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( L& Q/ f* k; A: O r$ Iint hexCharToInt(char hex) {
- `# A, Z" m# c# M! p2 h* [/ n) V hex = toupper(hex);
0 D/ i( L9 t3 a1 h) b( L6 ] if (isdigit(hex)) 3 ~" d0 x" \7 r4 U' Z" M q2 K
return (hex - '0');
$ f- X3 @! A% s; `4 F! t if (isalpha(hex)) 0 ~7 _# P/ Z- p
return (hex - 'A' + 10);
3 A4 w5 N& i* y' B6 e0 K! z return 0; 5 `8 {( G) ]9 j a' ?4 K2 D" R: Q
} ) ^4 B/ E0 A! e9 q/ G
3 J( N7 T* v. j3 z! `& |( @3 c
string bytesToHexString(const byte *in, size_t size) {
: p' B, Z9 s+ l, D, K7 F string str;
3 n+ y3 l. I2 J- p* J for (size_t i = 0; i < size; ++i) { 8 M: z/ }# q5 m3 N r( v' S
int t = in[i]; ) S4 N' o+ O4 P R
int a = t / 16; 4 \1 N8 u7 F/ _2 d( }: ^) z% v( R
int b = t % 16; * B# n, c3 Q7 l) {! l* I$ @( A
str.append(1, intToHexChar(a)); ( y' G, ?2 ~3 R1 r4 V, R8 d$ t' B
str.append(1, intToHexChar(b));
( F6 T% A& g- v* w4 }2 E if (i != size - 1)
" O/ P( _+ a+ X: x. x& T$ {# J str.append(1, ' ');
% F% T* R" o4 H1 ?; v# A# | s# L! _ }
' l9 F# Q( I) |; W$ G6 l0 A; S return str;
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& A/ ?3 i6 F* D/ \. s( }size_t hexStringToBytes(const string &str, byte *out) {
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9 U, U- \" d" S6 u5 o8 v/ s vector<string> vec; " E" [' h) O% ^3 H t
string::size_type currPos = 0, prevPos = 0;
( N g2 F# g: h9 O, R" x- b while ((currPos = str.find(' ', prevPos)) != string::npos) { ( A; n6 Q' g: \9 t7 Z! S7 a6 ~
string b(str.substr(prevPos, currPos - prevPos));
4 ^! w9 g7 C' Y( K1 u) B vec.push_back(b);
& p7 P" O @! \; s' z! C prevPos = currPos + 1;
$ M1 V0 g6 E9 U, ~4 d } . K, O, E1 u" x# }
if (prevPos < str.size()) {
0 q6 v6 m% X0 R. d1 C q+ _# p string b(str.substr(prevPos));
6 M. ^3 T5 e2 |5 O' R vec.push_back(b);
# A# D5 v) r8 a }
; E, }% d V4 ~% t: X typedef vector<string>::size_type sz_type;
5 f- E' o; P ^3 e& {6 ?' X) I6 D sz_type size = vec.size(); ' ~: _9 t8 G) B/ d/ ?
for (sz_type i = 0; i < size; ++i) { ( @! U+ \4 b- r& S/ R
int a = hexCharToInt(vec[i][0]);
m8 d; H) F$ O; X) \; G int b = hexCharToInt(vec[i][1]); ) O; N q+ r2 a
out[i] = a * 16 + b; + z3 E& N' Q1 R \
}
$ g l2 [6 k+ H- P- h return size;
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