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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h" 0 Z9 L/ Z3 N% @3 p
#include <vector> & F* S9 b, x( g" j0 l( U* z2 ~
2 {, b) P. H8 b2 Wusing namespace std;
# a/ q( j8 Y$ V# p
1 C! R" a0 V! `9 p! m7 j( t9 U" Z' }char intToHexChar(int x) {
' _/ k3 `! e9 m( R static const char HEX[16] = {
( ]8 @ R1 ]- B '0', '1', '2', '3', n% ^& a5 Q: Y7 V, x2 w
'4', '5', '6', '7',
$ f4 I2 a6 a8 k4 f& ` '8', '9', 'A', 'B',
1 t% G0 t9 I2 ]$ u2 A* X 'C', 'D', 'E', 'F' ( a7 p+ x1 X3 Z, z' w5 a
};
( g5 P9 [ x/ _( n U( u. a/ b& O return HEX[x];
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int hexCharToInt(char hex) { " ^6 {. j; U5 e+ s
hex = toupper(hex); % j( z- l! \4 I# X7 n$ |( s
if (isdigit(hex))
2 K( ~' X$ b9 q/ m2 ~9 G9 j return (hex - '0');
, r& ^: c! y; E4 T. e5 T, M if (isalpha(hex))
3 o2 k5 B# {% ~7 D0 l- h) O; j5 H return (hex - 'A' + 10);
& E' m2 M# k8 Z- Z return 0; 2 v" d. S3 o7 ~8 U
} + ]! G8 `3 a; W h
! R- g R( z7 ], u( J( u; Hstring bytesToHexString(const byte *in, size_t size) {
1 u, `3 B! _" _5 x& N; y1 a string str; 6 W2 A( {* w8 t
for (size_t i = 0; i < size; ++i) {
( X. T+ F/ G; ^. y/ H& }- k( p int t = in[i]; m2 d) j# e: g& P
int a = t / 16;
. B0 r9 A0 J1 _1 \ int b = t % 16;
8 C3 E9 U* G. V str.append(1, intToHexChar(a));
# E$ q. c* w$ Q0 K& D& `( F str.append(1, intToHexChar(b)); 7 X" k5 i0 Q- u0 f
if (i != size - 1)
, b9 y2 a# }$ e str.append(1, ' ');
" `9 T4 k% G! g' S3 U+ L }
# Y: ^5 L) n4 g7 v) S- D return str;
0 _& Z( R" ^% P2 v5 t, W" c}
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, u' y7 S# j; H3 U [% msize_t hexStringToBytes(const string &str, byte *out) { 9 G2 h! R+ J5 a( L
+ W0 s) W* H4 F3 h1 Q0 m vector<string> vec; 1 H. r* s! z0 _$ @8 ^ \
string::size_type currPos = 0, prevPos = 0; 7 t* g& E; p* S$ {* c# F+ d4 u
while ((currPos = str.find(' ', prevPos)) != string::npos) {
" ]+ K. B2 i: H7 h& [# \ string b(str.substr(prevPos, currPos - prevPos));
( w# W/ `. Z, J. O0 h$ T1 m vec.push_back(b);
& q6 C8 V* ?7 b$ S+ k9 c+ M prevPos = currPos + 1; 2 E* j0 \. N7 ]5 |/ A F! K
} - Q/ B8 p- w6 m0 w5 r: G0 d& O
if (prevPos < str.size()) { ( @/ r, w8 U! P
string b(str.substr(prevPos)); / E4 [1 ^3 [/ v# h" H( Z
vec.push_back(b);
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typedef vector<string>::size_type sz_type;
, f3 }" Z$ [7 A, ]; K sz_type size = vec.size();
' S3 g) v; Z- z; x# j, | for (sz_type i = 0; i < size; ++i) { 7 y3 M( N! @ f& x' O) {; q
int a = hexCharToInt(vec[i][0]); # K# w' M% c6 w6 Y2 U. a4 `* h! P* C
int b = hexCharToInt(vec[i][1]);
" [1 K( w+ p! Z( _ out[i] = a * 16 + b; ( W3 Z3 ?: s' N- F' \1 h
} ' ^; c' k( V A. q; O7 V
return size; " b) g" f% u5 N2 i1 b; J2 K
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