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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h" & `! w. I5 l. B o- Y
#include <vector>
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. s, ]2 `, @1 l0 G' o8 Y& b) R: m$ ]using namespace std;
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& m9 X4 ^% B( v3 `char intToHexChar(int x) { & J4 e- [+ z1 u8 i; I
static const char HEX[16] = { 4 S) w' T! W9 p% s
'0', '1', '2', '3',
9 H, Q/ K/ [, Q4 } '4', '5', '6', '7', / Q; h+ N- K0 h- t3 \5 L9 S% T
'8', '9', 'A', 'B', 3 o1 |- w4 n$ W3 A. w7 d
'C', 'D', 'E', 'F'
6 \8 P& q) A$ |! k! r }; . D8 z' c7 i3 r
return HEX[x]; 4 F* g) b2 u& w( v
} , @' g z4 A5 x+ C" Q& S
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int hexCharToInt(char hex) { % Y5 V3 m1 V- n) Z4 \ H. q
hex = toupper(hex); * M4 @3 P5 A9 C
if (isdigit(hex)) 6 m0 T8 `4 @8 t
return (hex - '0');
( E) q; b7 p6 D+ q4 k( ?9 F if (isalpha(hex)) * r: V( `/ `4 u( M- D8 @
return (hex - 'A' + 10); . `; @7 E" ?7 s. ?8 b
return 0; + s4 R+ A1 A- V2 Z
} I: b, {4 ?: D! X9 g6 Q' l& u/ f1 _3 K
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string bytesToHexString(const byte *in, size_t size) { , z6 c e0 }. q" {* R, |% X
string str;
5 F4 l# U! v. e; M for (size_t i = 0; i < size; ++i) { + _2 X4 Z: X! M: D$ L2 G t5 ?
int t = in[i]; , C0 o y& k, a4 w, y9 S
int a = t / 16; - Q. F+ C: y4 V# i9 Y
int b = t % 16; 9 q+ I1 v* [2 Q2 c k# \
str.append(1, intToHexChar(a));
7 a) N/ _% ]/ f" _* J str.append(1, intToHexChar(b));
- i4 {8 a. `/ A, H, ~ if (i != size - 1) 7 r5 c: X8 M; z! [0 {0 z
str.append(1, ' ');
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return str;
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+ v d5 M1 X) g! Psize_t hexStringToBytes(const string &str, byte *out) {
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vector<string> vec; + ~ u, s* ~& f$ |4 M+ e5 B/ _
string::size_type currPos = 0, prevPos = 0;
* N; e f2 R/ {7 ^ while ((currPos = str.find(' ', prevPos)) != string::npos) { % s6 X/ W+ V9 @8 T( u
string b(str.substr(prevPos, currPos - prevPos));
" P o6 H) z/ ?& r% f5 @, v vec.push_back(b); 5 J1 W9 {" q) O: D, T) z. q8 _
prevPos = currPos + 1;
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! x: F; f6 r) M2 L( T7 u, p if (prevPos < str.size()) {
' [. ~1 Y& e$ l! L! C string b(str.substr(prevPos)); 5 G; L3 x' ~6 l( g# K. @
vec.push_back(b);
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: K/ D. d( z, y. K& ]* v typedef vector<string>::size_type sz_type; : U8 J3 t) e' V6 J+ F" N" u
sz_type size = vec.size();
5 @% G2 ~) Z% t for (sz_type i = 0; i < size; ++i) {
% C- L' O; i1 d+ p3 W& q) q2 j int a = hexCharToInt(vec[i][0]);
; t5 B1 G8 t% I S7 C int b = hexCharToInt(vec[i][1]);
8 \- U" g W' I& ~8 I8 `8 O6 Y% u out[i] = a * 16 + b;
K" |4 C; `7 I: ~4 [0 { }
9 s! K( _ u a4 j) m return size; 4 e7 W" `& y3 R! p3 k$ J. }" u* l
} |
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