Object-C hex operation

# Import <Foundation/Foundation. h> @ interface nsstring (froad_nsstring_additionss)-(byte *) getbytes; + (nsstring *) stringfrombytes :( byte *) byte byteslen :( INT) Len; @ end @ implementation nsstring (bytes) -(byte *) getbytes {nsdata * Data = [self datausingencoding: nsutf16bigendianstringencoding]; byte * v_bytes = (byte *) [data bytes]; return v_bytes; // nsmutablearray * array = [[NSM Utablearray alloc] init] autorelease]; // For (INT I = 0; I <[Data Length]; I ++) // {// [array addobject: [nsnumber numberwithchar: v_bytes [I]; //} // return [Data Length];} + (nsstring *) stringfrombytes :( byte *) byte byteslen :( INT) len {nsdata * Data = [[nsdata alloc] initwithbytes: Byte Length: Len]; nsstring * s = [[[nsstring alloc] initwithdata: data encoding: nsutf16bigendianstringencoding] oraut ]; Return s ;}@ end @ interface HEX: nsobject {}@ end @ implementation hex + (byte) numfromchar: (char) c {If (C> = '0' & C <= '9') {return C-'0 ';} else if (C> = 'A' & C <= 'Z') {return C-'A' + 10 ;} else if (C> = 'A' & C <= 'Z') {return C-'A' + 10;} return-1 ;}+ (nsdata *) datafromhexstring: (nsstring *) S_T {// 4f60 597d // 0100 1111s_t = [S_T stringbyreplacingoccurrencesofstring: @ "" withstring: @ ""]; If ([S_T length] % 2! = 0) {return nil;} byte * retbytes = malloc (sizeof (char) * [S_T length]); byte * Ori = retbytes; For (INT I = 0; I <[S_T length];) {char highbit = [S_T characteratindex: I ++]; char lowbit = [S_T characteratindex: I ++]; // to byte A = [hex numfromchar: highbit]; byte B = [hex numfromchar: lowbit]; * (retbytes ++) = (a <4) | B;} nsdata * Data = [nsdata datawithbytes: Ori length: [S_T length]/2]; return data ;}+ (nsstring *) stringfrombyte :( byte) byteval; {nsmutablestring * STR = [nsmutablestring string]; byte byte1 = byteval> 4; byte byte2 = byteval & 0xf; [STR appendformat: @ "% x", byte1]; [STR appendformat: @ "% x", byte2]; return STR;} // 0000 0000 0000 0000 + (nsstring *) stringfromshort :( short) shortval {nsmutablestring * STR = [nsmutablestring string]; [STR appendformat: @ "% x", shortval> 12]; [STR appendformat: @ "% x ", (shortval> 8) & 0xf]; [STR appendformat: @ "% x", (shortval> 4) & 0xf]; [STR appendformat: @ "% x ", shortval & 0xf]; return STR ;}+ (nsstring *) hexstringfromdata :( nsdata *) Data {nsmutablestring * STR = [nsmutablestring string]; byte * byte = (byte *) [data bytes]; for (INT I = 0; I <[Data Length]; I ++) {[STR appendstring: [hex stringfrombyte: * (byte + I)];} return STR ;}@ endint main (INT argc, const char * argv []) {NSAID utoreleasepool * Pool = [[NSAID utoreleasepool alloc] init]; // string to UTF bytes. // nsstring * Ori = @ "registered successfully 123"; // nsdata * s_data = [Ori datausingencoding: nsutf16bigendianstringencoding]; // nslog (@ "% @", s_data); // UTF bytes to string. /// nsstring * s = [[nsstring alloc] initwithdata: s_data // encoding: nsutf16bigendianstringencoding]; // nslog (@ "% @", S ); // hexnsstring * s = [hex stringfromshort :( short) 0x123a]; nslog (@ "% @", S); nsstring * v_s = @ "4f60 597d "; nsdata * Data = [hex datafromhexstring: v_s]; nslog (@ "% @", data); nslog (@ "% @", [hex hexstringfromdata: Data]); [pool drain]; return 0 ;}