gen-code.c

一个很好的ASN1编解码软件包

    /* every class gets the no-arg constructor */
#if TCL
    if (printTclG && typeId == BASICTYPE_ENUMERATED)
    {
	fprintf (f, "#if TCL\n");
	fprintf (f, "			%s(): %s (_nmdescs[0].value) {}\n", derivedClassName, baseClassName);
	fprintf (f, "#else\n");
    }
#endif /* TCL */
    fprintf (f, "			%s(): %s() {}\n", derivedClassName, baseClassName);
#if TCL
    if (printTclG && typeId == BASICTYPE_ENUMERATED)
      fprintf (f, "#endif\n");
#endif /* TCL */

    switch (typeId)
    {
        case BASICTYPE_BOOLEAN:
            fprintf (f, "			%s (bool b): %s (b) {}\n", derivedClassName, baseClassName);
            break;

        case BASICTYPE_ENUMERATED:
        case BASICTYPE_INTEGER:
            fprintf (f, "			%s (int i): %s (i) {}\n", derivedClassName, baseClassName);
            break;

        case BASICTYPE_REAL:
            fprintf (f, "			%s (double d): %s (d) {}\n", derivedClassName, baseClassName);
            break;

	case BASICTYPE_OCTETSTRING:
            fprintf (f, "			%s (const char *str): %s (str) {}\n", derivedClassName, baseClassName);

            fprintf (f, "			%s (const char *str, const size_t len): %s (str, len) {}\n", derivedClassName, baseClassName);

            fprintf (f, "			%s (const %s &o): %s (o) {}\n", derivedClassName, baseClassName, baseClassName);

            /* include overloading of = op. MS 12/92 */
            fprintf (f, "  %s		&operator = (const %s &o)	{ ReSet (o); return *this; }\n", derivedClassName, derivedClassName);
            fprintf (f, "  %s		&operator = (const char *str)	{ ReSet (str); return *this; }\n", derivedClassName);
            break;

        case BASICTYPE_BITSTRING:
            fprintf (f, "			%s (const size_t bits): %s (bits) {}\n", derivedClassName, baseClassName);

            fprintf (f, "			%s (const char *str, const size_t bitLen): %s (str, bitLen) {}\n", derivedClassName, baseClassName);

            fprintf (f, "			%s (const %s &b): %s (b) {}\n",  derivedClassName, baseClassName, baseClassName);
            break;

            /* include overloading of = op. MS 12/92 */
            fprintf (f, "  %s		&operator = (const %s &b)	{ ReSet (b); return *this; }\n", derivedClassName, derivedClassName);

        case BASICTYPE_OID:
            fprintf (f, "			%s (const char *encOid, size_t len): %s (encOid, len) {}\n", derivedClassName, baseClassName);

            fprintf (f, "			%s (const %s &o): %s (o) {}\n", derivedClassName, baseClassName, baseClassName);

            fprintf (f, "			%s (unsigned long int a1, unsigned long int a2, long int a3=-1, long int a4=-1, long int a5=-1, long int a6=-1, long int a7=-1, long int a8=-1, long int a9=-1, long int a10=-1, long int a11=-1): %s (a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11) {}\n", baseClassName, derivedClassName, baseClassName);

            /* include overloading of = op. MS 12/92 */
            fprintf (f, "  %s		&operator = (const %s &o)	{ ReSet (o); return *this; }\n", derivedClassName, derivedClassName);

            break;


        default:
            /* do nothing */
            break;
    }

} /* PrintDerivedConstructors */


static void
PrintMakeTag PARAMS ((f, tag),
    FILE *f _AND_
    Tag *tag)
{
    char *classStr;
    char *formStr;

    classStr = Class2ClassStr (tag->tclass);

    if (tag->form == ANY_FORM)  /* default to PRIM for dual form tags */
        formStr = Form2FormStr (PRIM);
    else
        formStr = Form2FormStr (tag->form);

    fprintf (f, "MAKE_TAG_ID (%s, %s, ", classStr, formStr);
    if (tag->tclass == UNIV)
        fprintf (f, "%s)", Code2UnivCodeStr (tag->code));
    else
        fprintf (f, "%d)", tag->code);

} /* PrintMakeTag */


static void
PrintPduMemberFcns PARAMS ((src, hdr, r, cln),
    FILE *src _AND_
    FILE *hdr _AND_
    CxxRules *r _AND_
    char *cln)
{
    if (printEncodersG)
    {
        fprintf (hdr, "  int			B%s (%s b, %s &bytesEncoded);\n", r->encodePduBaseName, bufTypeNameG, lenTypeNameG);

        fprintf (src, "int %s::B%s (%s b, %s &bytesEncoded)\n", cln, r->encodePduBaseName, bufTypeNameG, lenTypeNameG);
        fprintf (src, "{\n");
        fprintf (src, "    bytesEncoded = B%s (b);\n", r->encodeBaseName);
        fprintf (src, "    return !b.WriteError();\n");
        fprintf (src, "}\n\n");
    }

    if (printDecodersG)
    {
        fprintf (hdr, "  int			B%s (%s b, %s &bytesDecoded);\n", r->decodePduBaseName, bufTypeNameG, lenTypeNameG);

        fprintf (src, "int %s::B%s (%s b, %s &bytesDecoded)\n", cln, r->decodePduBaseName, bufTypeNameG, lenTypeNameG);
	fprintf (src, "{\n");
        fprintf (src, "    %s env;\n", envTypeNameG);
        fprintf (src, "    int val;\n\n");
        fprintf (src, "    bytesDecoded = 0;\n");
        fprintf (src, "    if ((val = setjmp (env)) == 0)\n");
        fprintf (src, "    {\n");
        fprintf (src, "         BDec (b, bytesDecoded, env);\n");
        fprintf (src, "         return !b.ReadError();\n");
        fprintf (src, "    }\n");
        fprintf (src, "    else\n");
        fprintf (src, "        return false;\n");
/*
        fprintf (src, "    { cerr << \"longjmp return value is \" << val << endl;\n");
        fprintf (src, "        return false; }\n");
*/
        fprintf (src, "}\n\n");
    }

    fprintf (hdr, "\n");

} /* PrintPduMemberFcns */


static void
PrintCxxEocEncoders PARAMS ((src, td, t, bufVarName),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t _AND_
    char *bufVarName)
{
    TagList *tl;
    Tag *tag;
    int stoleChoiceTags;

    /*
     * get all the tags on this type
     */
    tl = (TagList*) GetTags (t, &stoleChoiceTags);

    /*
     * leave choice elmt tag enc to encoding routine
     */
    if (!stoleChoiceTags)
    {
        FOR_EACH_LIST_ELMT (tag, tl)
            if (tag->form == CONS)
                fprintf (src, "      BEncEocIfNec (b);\n");
    }

    FreeTags (tl);

} /* PrintCxxEocEncoders */


static int
HasShortLen PARAMS ((t),
    Type *t)
{
    enum BasicTypeChoiceId typesType;
    /*
     * efficiency hack - use simple length (1 byte)
     * encoded for type (almost) guaranteed to have
     * encoded lengths of 0 <= len <= 127
     */
    typesType = GetBuiltinType (t);
    return typesType == BASICTYPE_BOOLEAN || typesType == BASICTYPE_INTEGER || typesType == BASICTYPE_NULL || typesType == BASICTYPE_REAL || typesType == BASICTYPE_ENUMERATED;
} /* HasShortLen */


/*
 * prints length encoding code.  Primitives always use
 * definite length and constructors get "ConsLen"
 * which can be configured at compile to to be indefinite
 * or definite.  Primitives can also be "short" (isShort is true)
 * in which case a fast macro is used to write the length.
 * Types for which isShort apply are: boolean, null and
 * (almost always) integer and reals
 */
static void
PrintCxxLenEncodingCode PARAMS ((f, isCons, isShort, lenVarName, bufVarName),
    FILE *f _AND_
    int isCons _AND_
    int isShort _AND_
    char *lenVarName _AND_
    char *bufVarName)
{
    if (isCons)
        fprintf (f, "    %s += BEncConsLen (%s, %s);\n", lenVarName, bufVarName, lenVarName);
    else
    {
        if (isShort)
        {
            fprintf (f, "    BEncDefLenTo127 (%s, %s);\n", bufVarName, lenVarName);
            fprintf (f, "    %s++;\n", lenVarName);
        }
        else
            fprintf (f, "    %s += BEncDefLen (%s, %s);\n", lenVarName, bufVarName, lenVarName);
    }
} /* PrintCxxLenEncodingCode */


/*
 * prints last tag's encoding code first
 */
static void
PrintCxxTagAndLenList PARAMS ((src, t, tagList, lenVarName, bufVarName),
    FILE *src _AND_
    Type *t _AND_
    TagList *tagList _AND_
    char *lenVarName _AND_
    char *bufVarName)
{
    char *classStr;
    char *formStr;
    char *codeStr;
    Tag *tg;
    Tag *last;
    int tagLen;
    enum BasicTypeChoiceId typesType;
    int isShort;

    if ((tagList == NULL) || LIST_EMPTY (tagList))
        return;

    /*
     * efficiency hack - use simple length (1 byte)
     * encoded for type (almost) guaranteed to have
     * encoded lengths of 0 <= len <= 127
     */
    isShort = HasShortLen (t);

    /*
     * since encoding backward encode tags backwards
     */
    last = (Tag*)LAST_LIST_ELMT (tagList);
    FOR_EACH_LIST_ELMT_RVS (tg, tagList)
    {
        classStr = Class2ClassStr (tg->tclass);

        if (tg->form == CONS)
        {
            formStr = Form2FormStr (CONS);
            PrintCxxLenEncodingCode (src, TRUE, isShort, lenVarName, bufVarName);
        }
        else /* PRIM or ANY_FORM */
        {
            formStr = Form2FormStr (PRIM);
            PrintCxxLenEncodingCode (src, FALSE, isShort, lenVarName, bufVarName);
        }

/*      GetTags sets the form properly now
        if (IsPrimitiveByDefOrRef (t) && (tg == last))
        {
            formStr = Form2FormStr (PRIM);
            PrintCxxLenEncodingCode (src, FALSE, isShort, lenVarName, bufVarName);
        }
        else
        {
            formStr = Form2FormStr (CONS);
            PrintCxxLenEncodingCode (src, TRUE, isShort, lenVarName, bufVarName);
        }
*/

        fprintf (src, "\n");

        tagLen = TagByteLen (tg->code);

        if (tg->tclass == UNIV)
	{
            fprintf (src, "    %s += BEncTag%d (%s, %s, %s, %s);\n", lenVarName, tagLen, bufVarName, classStr, formStr, Code2UnivCodeStr (tg->code));
	}
        else
	{
            fprintf (src, "    %s += BEncTag%d (%s, %s, %s, %d);\n", lenVarName, tagLen, bufVarName, classStr, formStr, tg->code);
	}
    }

} /* PrintCxxTagAndLenList */


/*
 *  Recursively walks through tags, printing lower lvl tags
 *  first (since encoding is done backwards).
 *
 */
static void
PrintCxxTagAndLenEncodingCode PARAMS ((src, td, t, lenVarName, bufVarName),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t _AND_
    char *lenVarName _AND_
    char *bufVarName)
{
    TagList *tl;
    int stoleChoiceTags;

    /*
     * get all the tags on this type
     */
    tl = (TagList*) GetTags (t, &stoleChoiceTags);

    /*
     * leave choice elmt tag enc to encoding routine
     */
    if (!stoleChoiceTags)
    {
	/*printf("\n Type: %s", td->definedName);*/
	PrintCxxTagAndLenList (src, t, tl, lenVarName, bufVarName);
    }

    FreeTags (tl);

} /* PrintCxxTagAndLenEncodingCode */


/*
 * used to figure out local variables to declare
 * for decoding tags/len pairs on type t
 */
static int
CxxCountVariableLevels PARAMS ((t),
    Type *t)
{
    if (GetBuiltinType (t) == BASICTYPE_CHOICE)
        return CountTags (t) +1; /* since must decode 1 internal tag type */
    else
        return CountTags (t);
} /* CxxCountVariableLevels */


/*
 * returns true if elmts curr following
 *  onward are all optional ow. false
 */
static int
RestAreTailOptional PARAMS ((e),
    NamedTypeList *e)
{
    NamedType *elmt;
    void *tmp;