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#ifndef TC_HEADER_Common_TLVPARSER
#define TC_HEADER_Common_TLVPARSER
#include "Platform/PlatformBase.h"
#include "Tcdefs.h"
namespace VeraCrypt
{
struct TLVNode
{
uint16 Tag; /* T */
uint16 Length; /* L */
shared_ptr<vector<byte>> Value; /* V */
byte TagSize;
byte LengthSize;
uint16 MoreFlag; /* Used In Sub */
uint16 SubFlag; /* Does it have sub-nodes? */
shared_ptr<vector<shared_ptr<TLVNode>>> Subs;
TLVNode() : Tag(0), Length(0), TagSize(0), LengthSize(0), MoreFlag(0), SubFlag(0)
{
Value = make_shared<vector<byte>>();
Subs = make_shared<vector<shared_ptr<TLVNode>>>();
}
~TLVNode()
{
burn(Value->data(), Value->size());
}
};
class TLVParser
{
private :
/* TLV node structure creation */
static shared_ptr<TLVNode> TLV_CreateNode();
/* Check if the bit is correct */
static uint16 CheckBit(byte value, int bit);
/* Parsing one TLV node */
static shared_ptr<TLVNode> TLV_Parse_One(byte* buf, size_t size);
/* Parsing all TLV nodes */
static int TLV_Parse_SubNodes(shared_ptr<TLVNode> parent);
/* Parsing all sub-nodes (in width not in depth) of a given parent node */
static int TLV_Parse_All(shared_ptr<TLVNode> parent);
/* Recursive function to parse all nodes starting from a root parent node */
static void TLV_Parse_Sub(shared_ptr<TLVNode> parent);
public:
/* Parsing TLV from a buffer and constructing TLV structure */
static shared_ptr<TLVNode> TLV_Parse(byte* buf, size_t size);
/* Finding a TLV node with a particular tag */
static shared_ptr<TLVNode> TLV_Find(shared_ptr<TLVNode> node, uint16 tag);
};
/* The definition of the exception class related to the TLV parsing */
class TLVException
{
public:
TLVException(std::string errormessage): m_errormessage(errormessage){}
/* Get the error message */
inline std::string ErrorMessage() const
{
return m_errormessage;
}
protected:
std::string m_errormessage;
};
}
#endif //TC_HEADER_Common_TLVPARSER
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