root/include/linux/asn1_ber_bytecode.h

INCLUDED FROM

/* 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)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#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_ACT           = 0x0a,
        /* 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_ACT      = 0x1a,

        /* Everything before here will want a tag from the data */
#define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT

        /* These are here to help fill up space */
        ASN1_OP_COND_FAIL               = 0x1b,
        ASN1_OP_COMPLETE                = 0x1c,
        ASN1_OP_ACT                     = 0x1d,
        ASN1_OP_RETURN                  = 0x1e,

        /* 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__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 */