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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h" ' {4 ?; N& E; t
#include <vector> $ d% t( O+ l1 ]( e, P: y; Y2 }
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using namespace std; * S& n0 C* ]5 W( n5 c; f
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char intToHexChar(int x) {
; i h( w2 x" ? static const char HEX[16] = { ; N6 W" ^- B5 F' W! R
'0', '1', '2', '3',
, F1 q$ d" a6 h '4', '5', '6', '7', 9 t9 ?- v9 y, o7 m0 v- y
'8', '9', 'A', 'B', ! ?( g( s/ o& F: _
'C', 'D', 'E', 'F' ( x8 h% I5 f1 g. m, r$ t* j& t
}; . M7 d( o, x; h+ R' [. |2 e
return HEX[x]; , ~ z: }, [' d' c
}
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int hexCharToInt(char hex) {
) V5 s2 w1 B' i* w! m hex = toupper(hex); ) M8 g: C6 T$ P# J% E3 G. u
if (isdigit(hex))
4 }( m# \9 ]! T8 S7 J# S" U return (hex - '0');
y& g7 V. T: Z* r4 x if (isalpha(hex))
6 S+ n0 @5 E) j/ L return (hex - 'A' + 10);
2 l& L# q- v7 F. g return 0; " C' Q$ G+ j. j4 B
}
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; K% B' ~3 ?. \6 ?string bytesToHexString(const byte *in, size_t size) { j! L! m$ P5 y/ q* K
string str; $ |/ `- v2 \; X* {6 G6 y
for (size_t i = 0; i < size; ++i) { $ r* G% g% Y$ W' O9 @
int t = in[i];
' O V4 B. m6 d4 P% A+ n int a = t / 16;
/ u, G1 f* p# M7 t int b = t % 16; ! x6 N. A9 \; W
str.append(1, intToHexChar(a));
R* k% |4 |" _* T" Q- S str.append(1, intToHexChar(b));
; P4 H! {, G1 n) D4 J. D if (i != size - 1) $ n7 S9 `. w, l6 e- Q
str.append(1, ' '); . p' P$ a# v* e. {6 _
}
6 ?# t( l, Z) V+ V3 r' C i return str; # E( g' X2 e- d% Y
} , |0 c$ b; y* x6 l5 g3 k |, e
) Y/ Q Q& `* Ksize_t hexStringToBytes(const string &str, byte *out) {
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6 F/ g2 J* J5 c+ G) | vector<string> vec;
6 D. o+ B% @8 g. h8 D5 n8 e: k string::size_type currPos = 0, prevPos = 0; ) @6 f9 d! x* s9 I( c/ b
while ((currPos = str.find(' ', prevPos)) != string::npos) {
6 V/ C$ Z& L' e5 M5 d$ J0 s string b(str.substr(prevPos, currPos - prevPos)); 4 f/ _" L8 k/ _" P6 {
vec.push_back(b);
& b9 u, m9 o7 ]& C" J prevPos = currPos + 1; . E. T3 e0 \: u0 [; \0 @! w; R% R1 @
} ) s8 E( E) c2 _3 K6 v b. b: J
if (prevPos < str.size()) { 0 m, A0 D7 r. ?# w7 g
string b(str.substr(prevPos)); ; W% s: x: x' ?$ M, X3 s; Q
vec.push_back(b);
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typedef vector<string>::size_type sz_type;
8 f- k. }. N" v3 E- Q sz_type size = vec.size();
! z8 J6 T: h) ` for (sz_type i = 0; i < size; ++i) { 3 L& E" E7 }/ X9 f9 _
int a = hexCharToInt(vec[i][0]); $ c0 l. R1 f& C& G
int b = hexCharToInt(vec[i][1]); - T4 o& S# O! [+ E9 {' ^8 n
out[i] = a * 16 + b;
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$ ~3 l! D1 C/ K; B3 l return size; , u$ y8 ^ [1 e l. G/ s; A
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