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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h"
9 A9 d. t. ?- [, R, g' l& [#include <vector>
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using namespace std;
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char intToHexChar(int x) {
1 j5 K# Z7 t9 ~. [) x e6 ~3 ] P0 h5 D static const char HEX[16] = { 7 t0 G, W4 h' ~( S& x8 X$ A
'0', '1', '2', '3',
[6 F4 u. N" I7 ]# D '4', '5', '6', '7',
8 j( F4 U$ Q6 [0 F0 D: ~1 T& l: d '8', '9', 'A', 'B', q l7 U+ v& X/ M! l4 A
'C', 'D', 'E', 'F'
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return HEX[x];
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int hexCharToInt(char hex) {
- T- m' C# `% ?* | hex = toupper(hex); 9 F# k2 h0 K& u; ^
if (isdigit(hex)) * [& _' x$ S3 o2 I5 B, X9 h
return (hex - '0'); / k3 S5 J& x+ r" g3 I- M5 q' \ k
if (isalpha(hex))
! R, n8 V3 [" L1 s4 o# K# U return (hex - 'A' + 10); , R: T# B% Q* I( b! S- B/ u1 m
return 0; 1 \$ H( g% t) j) }5 G/ K. @
}
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5 O! [' @, g) rstring bytesToHexString(const byte *in, size_t size) {
4 ?3 @. b$ ?1 x6 J6 l# G, | string str; & d9 i X$ Z. T0 M$ y7 W
for (size_t i = 0; i < size; ++i) { 7 k5 U" ]/ u% K" V; H; Z: q2 v7 L( Z
int t = in[i]; 3 _. q, ^4 Q4 D% ^8 I' o
int a = t / 16;
; N$ i2 h+ @1 r3 I$ I6 y) i int b = t % 16; ( K# x: }" Q6 A7 Y+ I- @& X$ F/ R. x
str.append(1, intToHexChar(a));
- v' R( d; V2 A+ N x) J str.append(1, intToHexChar(b));
; z) l0 b, G* \. T) E4 @ ~ if (i != size - 1) % i" ^4 x$ P4 h
str.append(1, ' ');
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return str; . p0 v% p7 D/ Q( J. H
}
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6 v# ?3 O( f( fsize_t hexStringToBytes(const string &str, byte *out) {
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vector<string> vec;
2 w5 F# d/ {/ H/ y$ w: I string::size_type currPos = 0, prevPos = 0;
: i& T; T0 a- o while ((currPos = str.find(' ', prevPos)) != string::npos) { " e T- {" E( r
string b(str.substr(prevPos, currPos - prevPos)); . @# y3 e4 I$ o" G
vec.push_back(b);
" v6 l8 m6 {$ E# S- g prevPos = currPos + 1; 7 u( l1 T3 ?3 t( \- T9 g- f
}
4 C* Z% w, j& j' ` if (prevPos < str.size()) { / t$ H6 m4 w" ~
string b(str.substr(prevPos)); 5 p. R/ w3 O4 w- ^
vec.push_back(b); 8 D( Q7 \( n: r5 r
}
: @: o$ N; Z n typedef vector<string>::size_type sz_type; 6 h# W( P; n( v0 e- D( b3 D& z# [
sz_type size = vec.size(); 8 \- Y2 [3 f! v& h: u7 p
for (sz_type i = 0; i < size; ++i) { 8 Y$ X& j( ~. r" w
int a = hexCharToInt(vec[i][0]); 6 m" W' M' L r2 w! v1 H, s+ g! k- ^
int b = hexCharToInt(vec[i][1]);
4 i, U% A- x4 l1 r+ }" w1 G% c out[i] = a * 16 + b;
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return size; 5 L' |/ D( L" P$ y8 y3 Z
} |
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