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#include "TLVParser.h"
#include <string.h>
using namespace std;
/* TLV node structure creation */
shared_ptr<TLVNode> TLVParser::TLV_CreateNode()
{
shared_ptr<TLVNode> node= shared_ptr<TLVNode>(new TLVNode);
memset(node.get(),0,sizeof(*node));
return node;
}
/* Check if the bit is correct */
uint16_t TLVParser::CheckBit(unsigned char value, int bit){
unsigned char bitvalue[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
if((bit >= 1)&&(bit <= 8)){
if(value & bitvalue[bit-1]) {
return (1);
}
else {
return (0);
}
}
else{
throw TLVException("FILE:"+string(__FILE__)+"LINE: "+to_string(static_cast<long long>((__LINE__)))+" fonction parameter incorrect! bit=["+to_string(static_cast<long long>(bit)));
return(2);
}
}
/* Parsing one TLV node */
shared_ptr<TLVNode> TLVParser::TLV_Parse_One(unsigned char* buf,int size){
int index = 0;
int i;
unsigned char tag1,tag2,tagsize;
unsigned char len,lensize;
unsigned char* value;
shared_ptr<TLVNode> node = TLV_CreateNode();
tag1 = tag2 = 0;
tagsize = 1;
tag1 = buf[index++];
if((tag1 & 0x1f) == 0x1f){
tagsize++;
tag2 = buf[index++];
//tag2 b8 must be 0!
}
if(tagsize == 1) {
node->Tag = tag1;
}
else {
node->Tag = (tag1 << 8) + tag2;
}
node->TagSize = tagsize;
//SubFlag
node->SubFlag = CheckBit(tag1,6);
//L zone
len = 0;
lensize = 1;
len = buf[index++];
if(CheckBit(len,8) == 0){
node->Length = len;
}
else{
lensize = len & 0x7f;
len = 0;
for(i=0;i<lensize;i++){
len += (uint16_t)buf[index++] << (i*8);
}
lensize++;
}
node->Length = len;
node->LengthSize = lensize;
//V zone
value = new unsigned char[len];
std::copy(buf+index,buf+index+len,value);
node->Value = value;
index += len;
if(index < size){
node->MoreFlag = 1;
}
else if(index == size){
node->MoreFlag = 0;
}
else{
throw TLVException("Parse Error! index="+to_string(static_cast<long long>(index))+"size="+to_string(static_cast<long long>(size)));
}
return node;
}
/* Parsing all sub-nodes (in width not in depth) of a given parent node */
int TLVParser::TLV_Parse_SubNodes(shared_ptr<TLVNode> parent){
int sublen = 0;
int i;
//No sub-nodes
if(parent->SubFlag == 0)
return 0;
for(i=0;i<parent->SubCount;i++)
{
sublen += (parent->Sub[i]->TagSize + parent->Sub[i]->Length + parent->Sub[i]->LengthSize);
}
if(sublen < parent->Length)
{
shared_ptr<TLVNode> subnode = TLV_Parse_One(parent->Value+sublen,parent->Length-sublen);
parent->Sub[parent->SubCount++] = subnode;
return subnode->MoreFlag;
}
else
{
return 0;
}
}
/* Recursive function to parse all nodes starting from a root parent node */
void TLVParser::TLV_Parse_Sub(shared_ptr<TLVNode> parent)
{
int i;
if(parent->SubFlag != 0)
{
//Parse all sub nodes.
while(TLV_Parse_SubNodes(parent) != 0);
for(i=0;i<parent->SubCount;i++)
{
if(parent->Sub[i]->SubFlag != 0)
{
TLV_Parse_Sub(parent->Sub[i]);
}
}
}
return;
}
/* Parsing TLV from a buffer and constructing TLV structure */
shared_ptr<TLVNode> TLVParser::TLV_Parse(unsigned char* buf,int size)
{
shared_ptr<TLVNode> node = TLV_Parse_One(buf,size);
TLV_Parse_Sub(node);
return node;
}
/* Finding a TLV node with a particular tag */
shared_ptr<TLVNode> TLVParser::TLV_Find(shared_ptr<TLVNode> node,uint16_t tag){
int i;
shared_ptr<TLVNode> tmpnode;
if(node->Tag == tag)
{
return node;
}
for(i=0;i<node->SubCount;i++)
{
tmpnode = NULL;
tmpnode = TLV_Find(node->Sub[i],tag);
if(tmpnode != NULL){
return tmpnode;
}
}
if(node->Next)
{
tmpnode = NULL;
tmpnode = TLV_Find(node->Next,tag);
if(tmpnode != NULL){
return tmpnode;
}
}
return nullptr;
}
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