asn1tag.cpp

Mysql的处理

// ASN1Tag.cpp: implementation of the CASN1Tag class.
//
//////////////////////////////////////////////////////////////////////

#include "ASN1Tag.h"
#include "ASN1Exception.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
namespace ASN1
{
    static String TAG_NAMES[] = {
        "End of Content", 
			"BOOLEAN", 
			"INTEGER", 
			"BIT_STRING", 
			"OCTET_STRING", 
			"NULL", 
			"OBJECT_IDENTIFIER", 
			"OBJECT_DESCRIPTOR", 
			"EXTERNAL", 
			"REAL", 
        "ENUMERATED", 
		"EMBEDDED_PDV", 
		"UTF8STRING", 
		"Unknown", 
		"Unknown", 
		"Unknown", 
		"SEQUENCE", 
		"SET", "NUMERICSTRING", "PRINTABLESTRING", 
        "T61STRING", "VIDEOTEXSTRING", "IA5String", "UTCTime", "GENERALIZEDTIME", "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", "UNIVERSALSTRING", "UNKNOWN", 
        "BMPSTRING"
    };

    static String CLASS_NAMES[] = {
        "UNIVERSAL", "APPLICATION", "CONTEXT", "PRIVATE"
    };

	CASN1Tag::CASN1Tag(int iTagNumber, int iTagClass, int iTagMode)
	{
		m_iTagClass=iTagClass;
		m_iTagNumber=iTagNumber;
		m_iTagMode=iTagMode;
	}

	CASN1Tag::CASN1Tag(const char* szInputStream, int nLength)	
	{
		const char* p = szInputStream;
		m_iTagClass = *p >> 6;
		int tmp = *p & 0x1F;
		m_iTagNumber = tmp;	
	}

	int CASN1Tag::Create(int iTagClass, int iTagNumber)
	{
		if(iTagNumber < 0 || iTagNumber > 0x1fffffff)
			return 0xffffffff;
		else
			return iTagClass << 30 | iTagNumber;

	}

	CASN1Tag::~CASN1Tag()
	{
		
	}
	int CASN1Tag::TagClass(int i)
	{
		return (unsigned int)i >> 30;;
	}

	int CASN1Tag::TagNumber(int i)
	{
		return i & 0x1fffffff;
	}

	String CASN1Tag::toString(int i)
    {
		int j = TagClass(i);
        int k = TagNumber(i);
        if(j == 0)
        {
            if(k < sizeof(TAG_NAMES) / sizeof(TAG_NAMES[0]))
			{
				char r[40];
				_snprintf(r, 40, "UNIVERSAL[%s]", TAG_NAMES[k].c_str());
                return  r;
			}
            else
			{
				char r[40];
				_snprintf(r, 40, "UNIVERSAL[%d]", k);
                return  r;
			}
        } 
		else
		{
			char r[40];
			_snprintf(r, 40, "%s[%d]", CLASS_NAMES[j].c_str(), k);
            return r;
        }
	}
}