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這是Linux內核源代碼樹中的文件linux/crypto/asymmetric_keys/x509-asn1.c。它使用分配盒裝指標像[ 0]，[ 1]，[ 2] .....這個數組是如何用C中的索引初始化的？
/*
* Automatically generated by asn1_compiler. Do not edit
*
* ASN.1 parser for x509
*/
#include <linux/asn1_ber_bytecode.h>
#include "x509-asn1.h"
enum x509_actions {
ACT_x509_extract_key_data = 0,
ACT_x509_extract_name_segment = 1,
ACT_x509_note_OID = 2,
ACT_x509_note_issuer = 3,
ACT_x509_note_not_after = 4,
ACT_x509_note_not_before = 5,
ACT_x509_note_pkey_algo = 6,
ACT_x509_note_signature = 7,
ACT_x509_note_subject = 8,
ACT_x509_note_tbs_certificate = 9,
ACT_x509_process_extension = 10,
NR__x509_actions = 11
};
static const asn1_action_t x509_action_table[NR__x509_actions] = {
[ 0] = x509_extract_key_data,
[ 1] = x509_extract_name_segment,
[ 2] = x509_note_OID,
[ 3] = x509_note_issuer,
[ 4] = x509_note_not_after,
[ 5] = x509_note_not_before,
[ 6] = x509_note_pkey_algo,
[ 7] = x509_note_signature,
[ 8] = x509_note_subject,
[ 9] = x509_note_tbs_certificate,
[ 10] = x509_process_extension,
};
static const unsigned char x509_machine[] = {
// Certificate
[ 0] = ASN1_OP_MATCH,
[ 1] = _tag(UNIV, CONS, SEQ),
// TBSCertificate
[ 2] = ASN1_OP_MATCH,
[ 3] = _tag(UNIV, CONS, SEQ),
[ 4] = ASN1_OP_MATCH_JUMP_OR_SKIP, // version
[ 5] = _tagn(CONT, CONS, 0),
[ 6] = _jump_target(68),
// CertificateSerialNumber
[ 7] = ASN1_OP_MATCH,
[ 8] = _tag(UNIV, PRIM, INT),
// AlgorithmIdentifier
[ 9] = ASN1_OP_MATCH_JUMP,
[ 10] = _tag(UNIV, CONS, SEQ),
[ 11] = _jump_target(72), // --> AlgorithmIdentifier
[ 12] = ASN1_OP_ACT,
[ 13] = _action(ACT_x509_note_pkey_algo),
// Name
[ 14] = ASN1_OP_MATCH_JUMP,
[ 15] = _tag(UNIV, CONS, SEQ),
[ 16] = _jump_target(78), // --> Name
[ 17] = ASN1_OP_ACT,
[ 18] = _action(ACT_x509_note_issuer),
// Validity
[ 19] = ASN1_OP_MATCH,
[ 20] = _tag(UNIV, CONS, SEQ),
// Time
[ 21] = ASN1_OP_MATCH_OR_SKIP, // utcTime
[ 22] = _tag(UNIV, PRIM, UNITIM),
[ 23] = ASN1_OP_COND_MATCH_OR_SKIP, // generalTime
[ 24] = _tag(UNIV, PRIM, GENTIM),
[ 25] = ASN1_OP_COND_FAIL,
[ 26] = ASN1_OP_ACT,
[ 27] = _action(ACT_x509_note_not_before),
// Time
[ 28] = ASN1_OP_MATCH_OR_SKIP, // utcTime
[ 29] = _tag(UNIV, PRIM, UNITIM),
[ 30] = ASN1_OP_COND_MATCH_OR_SKIP, // generalTime
[ 31] = _tag(UNIV, PRIM, GENTIM),
[ 32] = ASN1_OP_COND_FAIL,
[ 33] = ASN1_OP_ACT,
[ 34] = _action(ACT_x509_note_not_after),
[ 35] = ASN1_OP_END_SEQ,
// Name
[ 36] = ASN1_OP_MATCH_JUMP,
[ 37] = _tag(UNIV, CONS, SEQ),
[ 38] = _jump_target(78), // --> Name
[ 39] = ASN1_OP_ACT,
[ 40] = _action(ACT_x509_note_subject),
// SubjectPublicKeyInfo
[ 41] = ASN1_OP_MATCH,
[ 42] = _tag(UNIV, CONS, SEQ),
// AlgorithmIdentifier
[ 43] = ASN1_OP_MATCH_JUMP,
[ 44] = _tag(UNIV, CONS, SEQ),
[ 45] = _jump_target(72), // --> AlgorithmIdentifier
[ 46] = ASN1_OP_MATCH_ACT, // subjectPublicKey
[ 47] = _tag(UNIV, PRIM, BTS),
[ 48] = _action(ACT_x509_extract_key_data),
[ 49] = ASN1_OP_END_SEQ,
// UniqueIdentifier
[ 50] = ASN1_OP_MATCH_OR_SKIP,
[ 51] = _tagn(CONT, PRIM, 1),
// UniqueIdentifier
[ 52] = ASN1_OP_MATCH_OR_SKIP,
[ 53] = _tagn(CONT, PRIM, 2),
[ 54] = ASN1_OP_MATCH_JUMP_OR_SKIP, // extensions
[ 55] = _tagn(CONT, CONS, 3),
[ 56] = _jump_target(93),
[ 57] = ASN1_OP_END_SEQ,
[ 58] = ASN1_OP_ACT,
[ 59] = _action(ACT_x509_note_tbs_certificate),
// AlgorithmIdentifier
[ 60] = ASN1_OP_MATCH_JUMP,
[ 61] = _tag(UNIV, CONS, SEQ),
[ 62] = _jump_target(72), // --> AlgorithmIdentifier
[ 63] = ASN1_OP_MATCH_ACT, // signature
[ 64] = _tag(UNIV, PRIM, BTS),
[ 65] = _action(ACT_x509_note_signature),
[ 66] = ASN1_OP_END_SEQ,
[ 67] = ASN1_OP_COMPLETE,
// Version
[ 68] = ASN1_OP_MATCH,
[ 69] = _tag(UNIV, PRIM, INT),
[ 70] = ASN1_OP_END_SEQ,
[ 71] = ASN1_OP_RETURN,
[ 72] = ASN1_OP_MATCH_ACT, // algorithm
[ 73] = _tag(UNIV, PRIM, OID),
[ 74] = _action(ACT_x509_note_OID),
[ 75] = ASN1_OP_MATCH_ANY, // parameters
[ 76] = ASN1_OP_END_SEQ,
[ 77] = ASN1_OP_RETURN,
// RelativeDistinguishedName
[ 78] = ASN1_OP_MATCH,
[ 79] = _tag(UNIV, CONS, SET),
// AttributeValueAssertion
[ 80] = ASN1_OP_MATCH,
[ 81] = _tag(UNIV, CONS, SEQ),
[ 82] = ASN1_OP_MATCH_ACT, // attributeType
[ 83] = _tag(UNIV, PRIM, OID),
[ 84] = _action(ACT_x509_note_OID),
[ 85] = ASN1_OP_MATCH_ANY_ACT, // attributeValue
[ 86] = _action(ACT_x509_extract_name_segment),
[ 87] = ASN1_OP_END_SEQ,
[ 88] = ASN1_OP_END_SET_OF,
[ 89] = _jump_target(80),
[ 90] = ASN1_OP_END_SEQ_OF,
[ 91] = _jump_target(78),
[ 92] = ASN1_OP_RETURN,
// Extensions
[ 93] = ASN1_OP_MATCH,
[ 94] = _tag(UNIV, CONS, SEQ),
// Extension
[ 95] = ASN1_OP_MATCH,
[ 96] = _tag(UNIV, CONS, SEQ),
[ 97] = ASN1_OP_MATCH_ACT, // extnid
[ 98] = _tag(UNIV, PRIM, OID),
[ 99] = _action(ACT_x509_note_OID),
[ 100] = ASN1_OP_MATCH_OR_SKIP, // critical
[ 101] = _tag(UNIV, PRIM, BOOL),
[ 102] = ASN1_OP_MATCH_ACT, // extnValue
[ 103] = _tag(UNIV, PRIM, OTS),
[ 104] = _action(ACT_x509_process_extension),
[ 105] = ASN1_OP_END_SEQ,
[ 106] = ASN1_OP_END_SEQ_OF,
[ 107] = _jump_target(95),
[ 108] = ASN1_OP_END_SEQ,
[ 109] = ASN1_OP_RETURN,
};
const struct asn1_decoder x509_decoder = {
.machine = x509_machine,
.machlen = sizeof(x509_machine),
.actions = x509_action_table,
};