ASN1C编译

Question

我有一个小的asn1代码：

--------------------- ASN1 FILE ------------------------ ------

RectangleModule1 DEFINITIONS ::= 
BEGIN
Rectangle ::= SEQUENCE (SIZE(1..10)) OF SEQUENCE {

 item CHOICE    {

  height INTEGER,

  width  IA5String

 } --# UNTAGGED
}

END

当我用asn1c编译它时，它给了我Rectangle.c和Rectangle.h文件。 Rectangle的输出如下所示：

----------------------- Rectangle.h --------------------- ---------

/* Dependencies */

typedef enum item_PR {
  item_PR_NOTHING,    /* No components present */
item_PR_height,
item_PR_width
  } item_PR;

/* Rectangle */
typedef struct Rectangle {
  A_SEQUENCE_OF(struct Member {
    struct item {
        item_PR present;
        union item_u {
            long     height;
            IA5String_t  width;
        } choice;

        /* Context for parsing across buffer boundaries */
        asn_struct_ctx_t _asn_ctx;
    } item;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
  } ) list;

  /* Context for parsing across buffer boundaries */
  asn_struct_ctx_t _asn_ctx;
 } Rectangle_t;

但我希望我的输出看起来像这样：

  /* Dependencies */
  typedef enum item_PR_sl {
  item_PR_NOTHING_sl,    /* No components present */
  item_PR_height_sl,
  item_PR_width_sl
  } item_PR_sl;

  /* Rectangle */
  typedef struct Rectangle {
  A_SEQUENCE_OF(struct Member {
        struct item_sl {
        item_PR_sl present;
        union item_u_sl {
            long     height;
            IA5String_t  width;
        } choice;

        /* Context for parsing across buffer boundaries */
        asn_struct_ctx_t _asn_ctx;
    } item;

    /* Context for parsing across buffer boundaries */
    asn_struct_ctx_t _asn_ctx;
} ) list;

/* Context for parsing across buffer boundaries */
asn_struct_ctx_t _asn_ctx;
  } Rectangle_t;

---

即，要将_sl连接到项目字段。我无法通过更改asn文件来执行此操作。我不知道constr_CHOICE和constr_SEQUENCE是如何运作的。任何帮助将不胜感激。

Answer 1

花了几个小时后，我认为无法通过修改 asn 文件来完成。只能通过编辑通过编译asn文件生成的 .h 和 .c 文件来完成。