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发表于 2010-1-19 19:51:31
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util.cpp
#include "util.h"
" J* u3 ]% z2 e# z- D. q- j#include <vector> 3 q# f/ g" u6 k* `6 P- x: \1 K; f
1 d+ z* b; |8 L; ^% N+ b3 cusing namespace std; 5 } O5 C) } ?: v; }% N5 r+ A% w
$ _$ @ O8 p: ?' \char intToHexChar(int x) { / C5 [( s9 W; ~9 M( ~3 `
static const char HEX[16] = { 5 u5 l9 ^" U6 q( k
'0', '1', '2', '3', * G' g2 u q$ r
'4', '5', '6', '7',
) K& M0 l5 c: |" d* V, x$ A: s8 E '8', '9', 'A', 'B',
u8 ^1 N8 e9 \- I# Y& Z, K# g 'C', 'D', 'E', 'F'
3 w, E4 R# n% o7 e- `, D. q }; ; q3 _8 U9 B- \" @
return HEX[x]; ; N* B+ d9 P# f- ?: `) O# |
} - x, [7 p1 E! M3 K2 w6 v
, d$ D6 t6 Y0 p$ t
int hexCharToInt(char hex) {
4 @: C6 ~6 ^1 i v P hex = toupper(hex); ! w3 a, X+ T8 n2 c3 w0 M' J
if (isdigit(hex))
; w1 W- l4 Y8 ` return (hex - '0');
1 S9 L3 f3 ?. l) C, t5 U0 l if (isalpha(hex))
" F( Z$ H3 G8 |# Z! Q+ M z return (hex - 'A' + 10); : E) M# P' f) x0 r; \+ ^
return 0; * |6 w( G- S8 q& m2 C, V/ R
} ! Q# A/ L% ~% D1 v9 j) ]
. l) X. x. r/ A# W# w2 B
string bytesToHexString(const byte *in, size_t size) { " c* h% r5 A( m4 X# l$ k2 B
string str;
0 R# v* r2 O7 K1 L9 ~4 R" e for (size_t i = 0; i < size; ++i) { 0 G" [ K; E0 A) E' G! a( G+ u
int t = in[i];
' M2 {* q1 M- }' _' O& v int a = t / 16; 6 V5 ? I* f7 X( Y' z7 U& V, a
int b = t % 16;
" s: J2 d* |5 X0 L t, w. Y0 y+ X str.append(1, intToHexChar(a)); l7 V* B+ i8 h" ?5 z0 i' h' g1 I& U
str.append(1, intToHexChar(b));
+ I- I4 k- q. ]+ d5 x, _ if (i != size - 1) ' p1 J9 T" }9 r' K+ X6 i
str.append(1, ' '); / ]5 r1 v( h3 g/ S2 G
}
1 q5 y( D0 l$ ]5 U' ?6 T5 ~ return str; ' g ?) O5 n! g* t4 Z/ _) _, V% g
}
, j# V* z& c, ?& ~* L8 h3 I: Q
3 p! J' G9 m; m0 c1 C8 nsize_t hexStringToBytes(const string &str, byte *out) { f# r$ u1 q# x% p
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vector<string> vec; ; L5 o' U, q9 P/ \0 f+ j
string::size_type currPos = 0, prevPos = 0;
5 n- J2 X5 b# X while ((currPos = str.find(' ', prevPos)) != string::npos) {
$ O( `1 o" _; M% \ string b(str.substr(prevPos, currPos - prevPos));
3 Z* R+ a( r* a, U4 ~+ { vec.push_back(b);
* r. I) g- _. c; r+ P; ^ prevPos = currPos + 1;
- B6 L$ q. ^ I, b4 L }
. m+ q2 N; G8 a! \4 K if (prevPos < str.size()) {
0 k1 B' Q, b# Y string b(str.substr(prevPos));
4 w/ J- U- D2 w$ S+ {" s vec.push_back(b); 5 X8 X4 R7 ?$ x- G1 R
}
7 P1 J8 h. S( b typedef vector<string>::size_type sz_type; 2 e4 I* l8 x1 m2 P" d9 |: |2 D
sz_type size = vec.size();
9 R9 q7 g2 n- q+ l2 z W* `. m for (sz_type i = 0; i < size; ++i) {
9 p! e2 m5 S( H r4 n int a = hexCharToInt(vec[i][0]); . O" R9 k0 P- O* l' `
int b = hexCharToInt(vec[i][1]); ' N6 g3 {0 ^$ |6 S' `* R
out[i] = a * 16 + b;
) G- M5 z% w R4 _: J' K }
3 r( |% w5 y# }0 M& ~' h8 b# h$ p return size;
2 \9 [. F- V; B& Y9 _- _} |
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