/*
 * Copyright (c) 2003-2017 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
#ifndef __EXTENSIONS__
#define __EXTENSIONS__          /* for Sun */
#endif

#include "asn_application.h"	/* Application-visible API */
#include <osmocom/sbcap/sbcap_internal.h>

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

#ifdef	__cplusplus
extern "C" {
#endif

#if !defined(ASN_DISABLE_UPER_SUPPORT)
#include <uper_decoder.h>
#include <uper_encoder.h>
#endif  /* !defined(ASN_DISABLE_UPER_SUPPORT) */
#if !defined(ASN_DISABLE_APER_SUPPORT)
#include <aper_decoder.h>
#include <aper_encoder.h>
#endif  /* !defined(ASN_DISABLE_APER_SUPPORT) */

/* 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)

#ifdef  EMIT_ASN_DEBUG
#warning "Use ASN_EMIT_DEBUG instead of EMIT_ASN_DEBUG"
#define ASN_EMIT_DEBUG  EMIT_ASN_DEBUG
#endif

/*
 * 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	ASN_EMIT_DEBUG == 1	/* And it was asked to emit this code... */
#if __STDC_VERSION__ >= 199901L
#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	/* !C99 */
void CC_PRINTFLIKE(1, 2) ASN_DEBUG_f(const char *fmt, ...);
#define	ASN_DEBUG	ASN_DEBUG_f
#endif	/* C99 */
#else	/* ASN_EMIT_DEBUG != 1 */
#if __STDC_VERSION__ >= 199901L
#define ASN_DEBUG(...) do{}while(0)
#else   /* not C99 */
static void CC_PRINTFLIKE(1, 2) ASN_DEBUG(const char *fmt, ...) { (void)fmt; }
#endif  /* C99 or better */
#endif	/* ASN_EMIT_DEBUG */
#endif	/* ASN_DEBUG */

/*
 * Print to a callback.
 * The callback is expected to return negative values on error.
 * 0 and positive values are treated as success.
 * RETURN VALUES:
 *  -1: Failed to format or invoke the callback.
 *  >0: Size of the data that got delivered to the callback.
 */
ssize_t CC_PRINTFLIKE(3, 4)
asn__format_to_callback(
    int (*callback)(const void *, size_t, void *key), void *key,
    const char *fmt, ...);

/*
 * 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(size, foo) \
    do {                           \
        if(foo) goto cb_failed;    \
        er.encoded += (size);      \
    } while(0)
#define ASN__CALLBACK(buf, size) ASN__E_CALLBACK(size, ASN__E_cbc(buf, size))
#define ASN__CALLBACK2(buf1, size1, buf2, size2) \
    ASN__E_CALLBACK((size1) + (size2),           \
                    ASN__E_cbc(buf1, size1) || ASN__E_cbc(buf2, size2))
#define ASN__CALLBACK3(buf1, size1, buf2, size2, buf3, size3)          \
    ASN__E_CALLBACK((size1) + (size2) + (size3),                       \
                    ASN__E_cbc(buf1, size1) || ASN__E_cbc(buf2, size2) \
                        || ASN__E_cbc(buf3, size3))

#define ASN__TEXT_INDENT(nl, level)                                          \
    do {                                                                     \
        int tmp_level = (level);                                             \
        int tmp_nl = ((nl) != 0);                                            \
        int tmp_i;                                                           \
        if(tmp_nl) ASN__CALLBACK("\n", 1);                                   \
        if(tmp_level < 0) tmp_level = 0;                                     \
        for(tmp_i = 0; tmp_i < tmp_level; tmp_i++) ASN__CALLBACK("    ", 4); \
    } while(0)

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

/*
 * Check stack against overflow, if limit is set.
 */

/* Since GCC 13, AddressSanitizer started defaulting to
* ASAN_OPTIONS="detect_stack_use_after_return=1", which makes this check
* fail due to apparently jumping stack pointers.
* Hence, disable this check if building with ASan, as documented in:
* GCC: https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
* Clang: https://clang.llvm.org/docs/AddressSanitizer.html#conditional-compilation-with-has-feature-address-sanitizer
*/
#if defined(__SANITIZE_ADDRESS__)
	#define ASN__SANITIZE_ENABLED 1
#elif defined(__has_feature)
#if __has_feature(address_sanitizer)
	#define ASN__SANITIZE_ENABLED 1
#endif
#endif

#define	ASN__DEFAULT_STACK_MAX	(30000)

#if defined(ASN__SANITIZE_ENABLED) || defined(ASN_DISABLE_STACK_OVERFLOW_CHECK)
static int CC_NOTUSED
ASN__STACK_OVERFLOW_CHECK(const asn_codec_ctx_t *ctx) {
   (void)ctx;
   return 0;
}
#else
static int CC_NOTUSED
ASN__STACK_OVERFLOW_CHECK(const asn_codec_ctx_t *ctx) {
	if(ctx && ctx->max_stack_size) {

		/* ctx MUST be allocated on the stack */
		ptrdiff_t usedstack = ((const char *)ctx - (const 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;
}
#endif

#ifdef	__cplusplus
}
#endif

#endif	/* ASN_INTERNAL_H */
