skeletons/oer_decoder.c

/*
 * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>

/*
 * The OER decoder of any type.
 */
asn_dec_rval_t
oer_decode(asn_codec_ctx_t *opt_codec_ctx,
	asn_TYPE_descriptor_t *type_descriptor,
	void **struct_ptr, const void *ptr, size_t size) {
	asn_codec_ctx_t s_codec_ctx;

	/*
	 * Stack checker requires that the codec context
	 * must be allocated on the stack.
	 */
	if(opt_codec_ctx) {
		if(opt_codec_ctx->max_stack_size) {
			s_codec_ctx = *opt_codec_ctx;
			opt_codec_ctx = &s_codec_ctx;
		}
	} else {
		/* If context is not given, be security-conscious anyway */
		memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
		s_codec_ctx.max_stack_size = ASN__DEFAULT_STACK_MAX;
		opt_codec_ctx = &s_codec_ctx;
	}

	/*
	 * Invoke type-specific decoder.
	 */
	return type_descriptor->oer_decoder(opt_codec_ctx, type_descriptor, 0,
		struct_ptr,	/* Pointer to the destination structure */
		ptr, size	/* Buffer and its size */
		);
}