gen-enc.c

一个很好的ASN1编解码软件包

    switch (ctri->cTypeId)
    {
        case C_ANYDEFINEDBY:

            /* get type of 'defining' field (int/enum/oid)*/
            idNamedType = e->type->basicType->a.anyDefinedBy->link;
            tmpTypeId = GetBuiltinType (idNamedType->type);

            if (tmpTypeId == BASICTYPE_OID)
            {
                MakeVarPtrRef (genEncCRulesG, td, parent, idNamedType->type, varName, idVarRef);
                fprintf (src, "    SetAnyTypeByOid (%s, %s);\n", elmtVarRef, idVarRef);
            }
            else
            {
                /* want to ref int by value not ptr */
                MakeVarValueRef (genEncCRulesG, td, parent, idNamedType->type, varName, idVarRef);
                fprintf (src, "    SetAnyTypeByInt (%s, %s);\n", elmtVarRef, idVarRef);
            }

            /* ANY's enc's do tag and len so zap the Content suffix */
            fprintf (src, "    %s = B%s (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
            break;

        case C_TYPEREF:
            tmpType = GetType (e->type);

             /* NOTE: ANY DEFINED BY must be directly in the parent (not ref)*/
            if (tmpType->cTypeRefInfo->cTypeId != C_ANY)
            {
                fprintf (src, "    %s = B%sContent (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
                break;
            }
            else  /* fall through */

        case C_ANY:
            /* ANY's enc's do tag and len so zap the Content suffix */
            fprintf (src,"     /* ANY - Fix Me! */\n");
            fprintf (src, "    SetAnyTypeBy???(%s, ???);\n", elmtVarRef);
            fprintf (src, "    %s = B%s (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
            break;


        case C_LIB:
            fprintf (src, "    %s = B%sContent (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
            break;

        case C_CHOICE:
            PrintCBerChoiceEncodeCode (src, td, e->type, level+1, elmtVarRef);
            break;

        case C_STRUCT:
            PrintCBerElmtsEncodeCode (src, td, e->type, e->type->basicType->a.set, level+1, elmtVarRef);
            break;

        case C_LIST:
            PrintCBerListEncoderCode (src, td, e->type, level+1, elmtVarRef);
            fprintf (src, "    %s = %s;\n", itemLenNameG, listLenNameG);
            fprintf (src,"\n\n");
            break;

        case C_NO_TYPE:
            break;

        default:
            fprintf (stderr,"PrintCBerElmtEncodeCode: ERROR - unknown c type id\n");
            break;
    }

    if (ctri->cTypeId != C_ANY) /* ANY's do their own tag/lens */
    {
        PrintCTagAndLenEncodingCode (src, td, e->type);
        fprintf (src,"\n    %s += %s;\n", encodedLenVarNameG, itemLenNameG);
    }

    if (e->type->optional || (e->type->defaultVal != NULL))
        fprintf (src, "    }\n");

    fprintf (src,"\n");

}  /*  PrintCBerElmtEncodeCode */




/*
 * Generates code for internally defined lists
 * eg:
 * TypeX = SET { foo INTEGER, bar SEQUENCE OF INTEGER } -->
 * BerEncodeTypeX (b, v)
 * {
 *    ...
 *         listLen = 0;
 *         FOR_EACH_LIST_ELMT (component, v->bar)
 *         {
 *              itemLen = BerEncodeInteger (b, (int*) component);
 *              itemLen+= EncodeLen (b, itemLen)
 *              itemLen += ENCODE_TAG (b, INTEGER_TAG);
 *              listLen += itemLen;
 *         }
 *    ...
 * }
 */
static void
PrintCBerListEncoderCode PARAMS ((src, td, t, level, varName),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t _AND_
    int level _AND_
    char *varName)
{
    CTRI *ctri;
    char *elmtVarRef = "component";
    Type *tmpType;
    enum BasicTypeChoiceId tmpTypeId;
    TypeDef *idNamedType;


    ctri =  t->basicType->a.setOf->cTypeRefInfo;

    if (ctri == NULL)
        return;

    fprintf (src, "        listLen = 0;\n");
    fprintf (src, "    FOR_EACH_LIST_ELMT_RVS (component, %s)\n", varName);
    fprintf (src, "    {\n");

    PrintEocEncoders (src, td, t->basicType->a.setOf);

    /*
     * need extra case here for SET OF typedef not just SET OF typeref
     */
    switch (ctri->cTypeId)
    {

        case C_TYPEREF:
            tmpType = GetType (t->basicType->a.setOf);

             /* NOTE: ANY DEFINED BY must be directly in the parent (not ref)*/
            if (tmpType->cTypeRefInfo->cTypeId != C_ANY)
            {
                fprintf (src, "    %s = B%sContent (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
                break;
            }
            else  /* fall through */

        case C_ANY:
            /* ANY's enc's do tag and len so zap the Content suffix */
            fprintf (src,"     /* ANY - Fix Me! */\n");
            fprintf (src, "    SetAnyTypeBy???(%s, ???);\n", elmtVarRef);
            fprintf (src, "    %s = B%s (b, %s);\n", itemLenNameG, ctri->encodeRoutineName, elmtVarRef);
            break;



        default:
            fprintf (src, "    %s = B%sContent (b, (%s*) %s);\n", itemLenNameG, ctri->encodeRoutineName, ctri->cTypeName, elmtVarRef);
            break;

    }

    PrintCTagAndLenEncodingCode (src, td, t->basicType->a.setOf);
    fprintf (src,"\n");
    fprintf (src, "        %s += %s;\n", listLenNameG, itemLenNameG);
    fprintf (src, "    }\n");

}  /*  PrintCBerListEncoderCode */



static void
PrintCBerChoiceEncodeCode PARAMS ((src, td, t, level, varName),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t _AND_
    int level _AND_
    char *varName)
{
    NamedType *e;
    CTRI *ctri;
    void *tmp;

    ctri =  t->cTypeRefInfo;

    fprintf (src,"    switch (%s->%s)\n    {\n", varName, ctri->choiceIdEnumFieldName);

    FOR_EACH_LIST_ELMT (e, t->basicType->a.choice)
    {
        tmp = (void*)CURR_LIST_NODE (t->basicType->a.choice);

        if (e->type == NULL)
            continue;

        ctri =  e->type->cTypeRefInfo;

        if (ctri != NULL)
            fprintf (src, "       case %s:\n", ctri->choiceIdSymbol);
        else
            fprintf (src, "       case ????:\n");



        PrintCBerElmtEncodeCode (src, td, t, e, level+1, varName);
        fprintf (src,"    break;\n\n");

        SET_CURR_LIST_NODE (t->basicType->a.choice, tmp);
    }

    fprintf (src, "    }\n");
}  /* PrintCBerChoiceEncodeCode */



/*
 *  prints DecodeBerEocIfNec (b) for each constructed len
 *  assoc with given type
 */
static void
PrintEocEncoders PARAMS ((src, td, t),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t)
{
    TagList *tl;
    Tag *tag;
    int consTagCount;
    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");
        }
    }
/*
    consTagCount = 0;
    if (!stoleChoiceTags)
    {
        FOR_EACH_LIST_ELMT (tag, tl)
            consTagCount++;
    }

    if (IsPrimitiveByDefOrRef (t))
        consTagCount--;

    for (; consTagCount > 0; consTagCount--)
        fprintf (src,"    BEncEocIfNec (b);\n");

*/

    FreeTags (tl);

}  /* PrintEocEncoders */


/*
 *  Recursively walks throught type refs printing lower lvl tags
 *  first (since encoding is done backwards).
 *
 */
static void
PrintCTagAndLenEncodingCode PARAMS ((src, td, t),
    FILE *src _AND_
    TypeDef *td _AND_
    Type *t)
{
    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)
        PrintCTagAndLenList (src, t, tl);

    FreeTags (tl);

}  /* PrintCTagAndLenEncodingCode */



/*
 * prints last tag's encoding code first
 */
static void
PrintCTagAndLenList PARAMS ((src, t, tagList),
    FILE *src _AND_
    Type *t _AND_
    TagList *tagList)
{
    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
     */
    typesType = GetBuiltinType (t);
    if ((typesType == BASICTYPE_BOOLEAN) ||
        (typesType == BASICTYPE_INTEGER) ||
        (typesType == BASICTYPE_NULL) ||
        (typesType == BASICTYPE_REAL) ||
        (typesType == BASICTYPE_ENUMERATED))
        isShort = 1;
    else
        isShort = 0;

    /*
     * 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);
            PrintCLenEncodingCode (src, TRUE, isShort);
        }
        else /* PRIM or ANY_FORM */
        {
            formStr = Form2FormStr (PRIM);
            PrintCLenEncodingCode (src, FALSE, isShort);
        }

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

        fprintf (src,"\n");

        if (tg->code < 31)
            tagLen = 1;
        else if (tg->code < 128)
            tagLen = 2;
        else if (tg->code < 16384)
            tagLen = 3;
        else if (tg->code < 2097152)
            tagLen = 4;
        else
            tagLen = 5;

        fprintf (src,"    %s += BEncTag%d (b, %s, %s, %d);\n", itemLenNameG, tagLen, classStr, formStr, tg->code);
    }

}  /* PrintCTagAndLenList */

/*
 * 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
PrintCLenEncodingCode PARAMS ((f, isCons, isShort),
    FILE *f _AND_
    int isCons _AND_
    int isShort)
{
   /* fprintf (f, "    BER_ENCODE_DEF_LEN (b, itemLen, itemLen);"); */
    if (isCons)
        fprintf (f, "    itemLen += BEncConsLen (b, itemLen);");
    else
    {
        if (isShort)
        {
            fprintf (f, "    BEncDefLenTo127 (b, itemLen);\n");
            fprintf (f, "    itemLen++;");
        }
        else
            fprintf (f, "    itemLen += BEncDefLen (b, itemLen);");
    }
}  /* PrintCLenEncodingCode */