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Show/hide line numbers dnsname.h Source File

dnsname.h

00001 // dnsname.h 2013/8/27
00002 #pragma once
00003 //#include <string>
00004 #include "pico_string.h"
00005 class dnsname {
00006 public:
00007     uint8_t *buf;
00008     pico_string str;
00009     dnsname(uint8_t *s) {
00010         buf = s;
00011     }
00012     int decode(int pos) {
00013         while(1) {
00014             int len = buf[pos++];
00015             if (len == 0x00) {
00016                 break;
00017             }
00018             if ((len&0xc0) == 0xc0) { //compress
00019                 int offset = (len&0x3f)<<8|buf[pos];
00020                 decode(offset);
00021                 return pos+1;
00022             }
00023             if (!str.empty()) {
00024                 str.append(".");
00025             }
00026             str.append((const char*)(buf+pos), len);
00027             pos += len;
00028         }
00029         return pos;
00030     }
00031 
00032     int encode(int pos, char* s) {
00033         while(*s) {  
00034             char *f = strchr(s, '.');
00035             if (f == NULL) {
00036                 int len = strlen(s);
00037                 buf[pos++] = len;
00038                 memcpy(buf+pos, s, len);
00039                 pos += len;
00040                 break;
00041             }
00042             int len = f - s;
00043             buf[pos++] = len;
00044             memcpy(buf+pos, s, len);
00045             s = f+1;
00046             pos += len;
00047         }
00048         buf[pos++] = 0x00;
00049         return pos;
00050     }
00051 };
00052