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// Embedded bencode support, header definitions.
// 2012-09-29 <jc@wippler.nl> http://opensource.org/licenses/mit-license.php
#include "EmBencode.h"
enum { EMB_ANY, EMB_LEN, EMB_INT, EMB_STR };
uint8_t EmBdecode::reset () {
count = next;
level = next = 0;
state = EMB_ANY;
return count;
}
uint8_t EmBdecode::process (char ch) {
switch (state) {
case EMB_ANY:
if (ch < '0' || ch > '9') {
if (ch == 'i') {
AddToBuf(T_NUMBER);
state = EMB_INT;
} else if (ch == 'd' || ch == 'l') {
AddToBuf(ch == 'd' ? T_DICT : T_LIST);
++level;
} else if (ch == 'e') {
AddToBuf(T_POP);
--level;
break; // end of dict or list
}
return 0;
}
state = EMB_LEN;
count = 0;
// fall through
case EMB_LEN:
if (ch == ':') {
AddToBuf(T_STRING + count);
if (count == 0) {
AddToBuf(0);
break; // empty string
}
state = EMB_STR;
} else
count = 10 * count + (ch - '0');
return 0;
case EMB_STR:
AddToBuf(ch);
if (--count == 0) {
AddToBuf(0);
break; // end of string
}
return 0;
case EMB_INT:
if (ch == 'e') {
AddToBuf(0);
break; // end of int
}
AddToBuf(ch);
return 0;
}
// end of an item reached
if (level > 0) {
state = EMB_ANY;
return 0;
}
AddToBuf(T_END);
return reset(); // not in dict or list, data is complete
}
void EmBdecode::AddToBuf (char ch) {
if (next >= bufLen)
bufPtr[0] = T_END; // mark entire buffer as empty
else
bufPtr[next++] = ch;
}
uint8_t EmBdecode::nextToken () {
uint8_t ch = bufPtr[next++];
last = next;
switch (ch) {
default: // string
next += ch + 1;
return T_STRING;
case T_NUMBER:
while (bufPtr[next++] != 0)
;
break;
case T_END:
--next; // don't advance past end token
// fall through
case T_DICT:
case T_LIST:
case T_POP:
break;
}
return ch;
}
const char* EmBdecode::asString (uint8_t* plen) {
if (plen != 0)
*plen = next - last - 1;
return bufPtr + last;
}
long EmBdecode::asNumber () {
return atol(bufPtr + last);
}
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