/* 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 */