/* SPDX-License-Identifier: GPL-2.0-or-later */
/* ASN.1 BER/DER/CER parsing state machine internal definitions
 *
 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#ifndef _LINUX_ASN1_BER_BYTECODE_H
#define _LINUX_ASN1_BER_BYTECODE_H

#ifdef __KERNEL__
#include <linux/types.h>
#endif
#include <linux/asn1.h>

typedef int (*asn1_action_t)(void *context,
        size_t hdrlen, /* In case of ANY type */
        unsigned char tag, /* In case of ANY type */
        const void *value, size_t vlen);

struct asn1_decoder {
 const unsigned char *machine;
 size_t machlen;
 const asn1_action_t *actions;
};

enum asn1_opcode {
 /* The tag-matching ops come first and the odd-numbered slots
  * are for OR_SKIP ops.
 */
#define ASN1_OP_MATCH__SKIP    0x01
#define ASN1_OP_MATCH__ACT    0x02
#define ASN1_OP_MATCH__JUMP    0x04
#define ASN1_OP_MATCH__ANY    0x08
#define ASN1_OP_MATCH__COND    0x10

 ASN1_OP_MATCH   = 0x00,
 ASN1_OP_MATCH_OR_SKIP  = 0x01,
 ASN1_OP_MATCH_ACT  = 0x02,
 ASN1_OP_MATCH_ACT_OR_SKIP = 0x03,
 ASN1_OP_MATCH_JUMP  = 0x04,
 ASN1_OP_MATCH_JUMP_OR_SKIP = 0x05,
 ASN1_OP_MATCH_ANY  = 0x08,
 ASN1_OP_MATCH_ANY_OR_SKIP = 0x09,
 ASN1_OP_MATCH_ANY_ACT  = 0x0a,
 ASN1_OP_MATCH_ANY_ACT_OR_SKIP = 0x0b,
 /* Everything before here matches unconditionally */

 ASN1_OP_COND_MATCH_OR_SKIP = 0x11,
 ASN1_OP_COND_MATCH_ACT_OR_SKIP = 0x13,
 ASN1_OP_COND_MATCH_JUMP_OR_SKIP = 0x15,
 ASN1_OP_COND_MATCH_ANY  = 0x18,
 ASN1_OP_COND_MATCH_ANY_OR_SKIP = 0x19,
 ASN1_OP_COND_MATCH_ANY_ACT = 0x1a,
 ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP = 0x1b,

 /* Everything before here will want a tag from the data */
#define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP

 /* These are here to help fill up space */
 ASN1_OP_COND_FAIL  = 0x1c,
 ASN1_OP_COMPLETE  = 0x1d,
 ASN1_OP_ACT   = 0x1e,
 ASN1_OP_MAYBE_ACT  = 0x1f,

 /* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
 ASN1_OP_END_SEQ   = 0x20,
 ASN1_OP_END_SET   = 0x21,
 ASN1_OP_END_SEQ_OF  = 0x22,
 ASN1_OP_END_SET_OF  = 0x23,
 ASN1_OP_END_SEQ_ACT  = 0x24,
 ASN1_OP_END_SET_ACT  = 0x25,
 ASN1_OP_END_SEQ_OF_ACT  = 0x26,
 ASN1_OP_END_SET_OF_ACT  = 0x27,
#define ASN1_OP_END__SET    0x01
#define ASN1_OP_END__OF     0x02
#define ASN1_OP_END__ACT    0x04

 ASN1_OP_RETURN   = 0x28,

 ASN1_OP__NR
};

#define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
#define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
#define _jump_target(N) (N)
#define _action(N) (N)

#endif /* _LINUX_ASN1_BER_BYTECODE_H */