asn_internal.h

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/*-
 * Copyright (c) 2003, 2004, 2005, 2007 Lev Walkin <vlm@lionet.info>.
 * All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
/*
 * Declarations internally useful for the ASN.1 support code.
 */
#ifndef _ASN_INTERNAL_H_
#define _ASN_INTERNAL_H_

#include "asn_application.h"    /* Application-visible API */

#ifndef __NO_ASSERT_H__     /* Include assert.h only for internal use. */
#include <assert.h>     /* for assert() macro */
#endif

#ifdef  __cplusplus
extern "C" {
#endif

/* Environment version might be used to avoid running with the old library */
#define ASN1C_ENVIRONMENT_VERSION   923 /* Compile-time version */
int get_asn1c_environment_version(void);    /* Run-time version */

#define CALLOC(nmemb, size) calloc(nmemb, size)
#define MALLOC(size)        malloc(size)
#define REALLOC(oldptr, size)   realloc(oldptr, size)
#define FREEMEM(ptr)        free(ptr)

#define asn_debug_indent    0
#define ASN_DEBUG_INDENT_ADD(i) do{}while(0)

/*
 * A macro for debugging the ASN.1 internals.
 * You may enable or override it.
 */
#ifndef ASN_DEBUG   /* If debugging code is not defined elsewhere... */
#if EMIT_ASN_DEBUG == 1 /* And it was asked to emit this code... */
#ifdef  __GNUC__
#ifdef  ASN_THREAD_SAFE
/* Thread safety requires sacrifice in output indentation:
 * Retain empty definition of ASN_DEBUG_INDENT_ADD. */
#else   /* !ASN_THREAD_SAFE */
#undef  ASN_DEBUG_INDENT_ADD
#undef  asn_debug_indent
int asn_debug_indent;
#define ASN_DEBUG_INDENT_ADD(i) do { asn_debug_indent += i; } while(0)
#endif  /* ASN_THREAD_SAFE */
#define ASN_DEBUG(fmt, args...) do {            \
        int adi = asn_debug_indent;     \
        while(adi--) fprintf(stderr, " ");  \
        fprintf(stderr, fmt, ##args);       \
        fprintf(stderr, " (%s:%d)\n",       \
            __FILE__, __LINE__);        \
    } while(0)
#else   /* !__GNUC__ */
void ASN_DEBUG_f(const char *fmt, ...);
#define ASN_DEBUG   ASN_DEBUG_f
#endif  /* __GNUC__ */
#else   /* EMIT_ASN_DEBUG != 1 */
static inline void ASN_DEBUG(const char *fmt, ...) { (void)fmt; }
#endif  /* EMIT_ASN_DEBUG */
#endif  /* ASN_DEBUG */

/*
 * Invoke the application-supplied callback and fail, if something is wrong.
 */
#define __ASN_E_cbc(buf, size)  (cb((buf), (size), app_key) < 0)
#define _ASN_E_CALLBACK(foo)    do {                    \
        if(foo) goto cb_failed;                 \
    } while(0)
#define _ASN_CALLBACK(buf, size)                    \
    _ASN_E_CALLBACK(__ASN_E_cbc(buf, size))
#define _ASN_CALLBACK2(buf1, size1, buf2, size2)            \
    _ASN_E_CALLBACK(__ASN_E_cbc(buf1, size1) || __ASN_E_cbc(buf2, size2))
#define _ASN_CALLBACK3(buf1, size1, buf2, size2, buf3, size3)       \
    _ASN_E_CALLBACK(__ASN_E_cbc(buf1, size1)            \
        || __ASN_E_cbc(buf2, size2)             \
        || __ASN_E_cbc(buf3, size3))

#define _i_ASN_TEXT_INDENT(nl, level) do {              \
    int __level = (level);                      \
    int __nl = ((nl) != 0);                     \
    int __i;                            \
    if(__nl) _ASN_CALLBACK("\n", 1);                \
    if(__level < 0) __level = 0;                    \
    for(__i = 0; __i < __level; __i++)              \
        _ASN_CALLBACK("    ", 4);               \
    er.encoded += __nl + 4 * __level;               \
} while(0)

#define _i_INDENT(nl)   do {                        \
    int __i;                            \
    if((nl) && cb("\n", 1, app_key) < 0) return -1;         \
    for(__i = 0; __i < ilevel; __i++)               \
        if(cb("    ", 4, app_key) < 0) return -1;       \
} while(0)

/*
 * Check stack against overflow, if limit is set.
 */
#define _ASN_DEFAULT_STACK_MAX  (30000)
static inline int
_ASN_STACK_OVERFLOW_CHECK(asn_codec_ctx_t *ctx) {
    if(ctx && ctx->max_stack_size) {

        /* ctx MUST be allocated on the stack */
        ptrdiff_t usedstack = ((char *)ctx - (char *)&ctx);
        if(usedstack > 0) usedstack = -usedstack; /* grows up! */

        /* double negative required to avoid int wrap-around */
        if(usedstack < -(ptrdiff_t)ctx->max_stack_size) {
            ASN_DEBUG("Stack limit %ld reached",
                (long)ctx->max_stack_size);
            return -1;
        }
    }
    return 0;
}

#ifdef  __cplusplus
}
#endif

#endif  /* _ASN_INTERNAL_H_ */