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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h"
; E" Y( D* C6 U2 T( v/ o$ i#include <vector>
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+ W1 Q" X. o8 h5 L& b$ _using namespace std; , w9 C, t& h# T2 B2 L5 K3 y
" k1 {6 U5 A# f2 e- v, ?! S- ~0 gchar intToHexChar(int x) {
2 G/ F( M* B! M# P- W. [, f static const char HEX[16] = { , j, E0 `8 n8 ~2 `- ]
'0', '1', '2', '3', ' N( ]4 O2 }7 \+ c6 H8 l4 H
'4', '5', '6', '7', + V# @- G0 Y& X% u
'8', '9', 'A', 'B',
# F b/ B6 ]( C5 z+ q2 Y 'C', 'D', 'E', 'F' & c2 v+ J" E) m. g* F1 e( [9 Y
}; ! g5 q, T/ x; h5 `! a; \: M0 x- j
return HEX[x];
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int hexCharToInt(char hex) { - S- n3 P( d: u. _' a
hex = toupper(hex);
3 r6 @. N5 a; F. x* [* t if (isdigit(hex))
0 u; x! f8 [4 U, ^+ x return (hex - '0'); 5 k4 p, y6 `! V
if (isalpha(hex))
) k0 t; `$ p0 p) w( S* k% k return (hex - 'A' + 10); ; j4 n' H$ _% P5 A" T0 u
return 0;
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! {% ?; Y' Z3 q/ Q" Y2 K. pstring bytesToHexString(const byte *in, size_t size) { / w# j J' u" r+ ~$ C2 m% R
string str;
% u* P9 R; q- G& t) K for (size_t i = 0; i < size; ++i) { 4 j7 Z1 h$ @, p* _9 N1 a ]/ \! C- g
int t = in[i];
6 M/ n0 ?9 z$ ^7 O& ]7 \2 a2 L) `) A int a = t / 16; 0 W& P7 ]( e3 @
int b = t % 16;
4 i0 N2 n5 ^" Q- y1 j str.append(1, intToHexChar(a)); 4 w0 h& |, K# o! J- w- O% m& q: \+ m" {
str.append(1, intToHexChar(b)); * ?( Y1 N. s6 z
if (i != size - 1) 9 N4 ?, l: P7 V- U& K
str.append(1, ' ');
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4 s3 o% o$ F4 q/ t. s return str; 4 k: I7 H: Y! u% l
}
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size_t hexStringToBytes(const string &str, byte *out) { 0 R. w0 |( |- q/ f3 o
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vector<string> vec; & m9 M9 c* ~: D# R s, ~
string::size_type currPos = 0, prevPos = 0;
6 m3 q/ i- R# a! X( J+ T$ ~) b while ((currPos = str.find(' ', prevPos)) != string::npos) { 9 C4 B0 b4 s( k, U# \6 \
string b(str.substr(prevPos, currPos - prevPos));
% ^9 g9 C, v( h! t! r vec.push_back(b); 6 {( d& F5 f# c( }: r' H
prevPos = currPos + 1;
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if (prevPos < str.size()) {
& x+ {+ E6 G# | T- R string b(str.substr(prevPos)); 5 s& J( \% }8 u4 W
vec.push_back(b); 4 p4 P+ b+ h" t! p
}
. N0 N/ i; I7 t; J& d7 V J typedef vector<string>::size_type sz_type;
9 Z$ u1 C. C3 `2 b/ ^, A9 r sz_type size = vec.size();
7 @9 r, E) ]2 P: O0 T for (sz_type i = 0; i < size; ++i) { 2 A: h+ f I/ m& Y
int a = hexCharToInt(vec[i][0]);
, E8 G7 L, o6 c int b = hexCharToInt(vec[i][1]);
% d+ m8 J5 [5 r% e, ? out[i] = a * 16 + b;
# s& i9 D; {2 @9 x }
5 ] j- }" Q& Q' ?6 R return size;
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