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DNSClient/dnsname.h@0:e11e8793c3ce, 2014-08-20 (annotated)

Committer:
Bongjun
Date:
Wed Aug 20 00:28:37 2014 +0000
Revision:
0:e11e8793c3ce
first release.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bongjun 0:e11e8793c3ce 1 // dnsname.h 2013/8/27
Bongjun 0:e11e8793c3ce 2 #pragma once
Bongjun 0:e11e8793c3ce 3 //#include <string>
Bongjun 0:e11e8793c3ce 4 #include "pico_string.h"
Bongjun 0:e11e8793c3ce 5 class dnsname {
Bongjun 0:e11e8793c3ce 6 public:
Bongjun 0:e11e8793c3ce 7 uint8_t *buf;
Bongjun 0:e11e8793c3ce 8 pico_string str;
Bongjun 0:e11e8793c3ce 9 dnsname(uint8_t *s) {
Bongjun 0:e11e8793c3ce 10 buf = s;
Bongjun 0:e11e8793c3ce 11 }
Bongjun 0:e11e8793c3ce 12 int decode(int pos) {
Bongjun 0:e11e8793c3ce 13 while(1) {
Bongjun 0:e11e8793c3ce 14 int len = buf[pos++];
Bongjun 0:e11e8793c3ce 15 if (len == 0x00) {
Bongjun 0:e11e8793c3ce 16 break;
Bongjun 0:e11e8793c3ce 17 }
Bongjun 0:e11e8793c3ce 18 if ((len&0xc0) == 0xc0) { //compress
Bongjun 0:e11e8793c3ce 19 int offset = (len&0x3f)<<8|buf[pos];
Bongjun 0:e11e8793c3ce 20 decode(offset);
Bongjun 0:e11e8793c3ce 21 return pos+1;
Bongjun 0:e11e8793c3ce 22 }
Bongjun 0:e11e8793c3ce 23 if (!str.empty()) {
Bongjun 0:e11e8793c3ce 24 str.append(".");
Bongjun 0:e11e8793c3ce 25 }
Bongjun 0:e11e8793c3ce 26 str.append((const char*)(buf+pos), len);
Bongjun 0:e11e8793c3ce 27 pos += len;
Bongjun 0:e11e8793c3ce 28 }
Bongjun 0:e11e8793c3ce 29 return pos;
Bongjun 0:e11e8793c3ce 30 }
Bongjun 0:e11e8793c3ce 31
Bongjun 0:e11e8793c3ce 32 int encode(int pos, char* s) {
Bongjun 0:e11e8793c3ce 33 while(*s) {
Bongjun 0:e11e8793c3ce 34 char *f = strchr(s, '.');
Bongjun 0:e11e8793c3ce 35 if (f == NULL) {
Bongjun 0:e11e8793c3ce 36 int len = strlen(s);
Bongjun 0:e11e8793c3ce 37 buf[pos++] = len;
Bongjun 0:e11e8793c3ce 38 memcpy(buf+pos, s, len);
Bongjun 0:e11e8793c3ce 39 pos += len;
Bongjun 0:e11e8793c3ce 40 break;
Bongjun 0:e11e8793c3ce 41 }
Bongjun 0:e11e8793c3ce 42 int len = f - s;
Bongjun 0:e11e8793c3ce 43 buf[pos++] = len;
Bongjun 0:e11e8793c3ce 44 memcpy(buf+pos, s, len);
Bongjun 0:e11e8793c3ce 45 s = f+1;
Bongjun 0:e11e8793c3ce 46 pos += len;
Bongjun 0:e11e8793c3ce 47 }
Bongjun 0:e11e8793c3ce 48 buf[pos++] = 0x00;
Bongjun 0:e11e8793c3ce 49 return pos;
Bongjun 0:e11e8793c3ce 50 }
Bongjun 0:e11e8793c3ce 51 };