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asn1c
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using higher abstraction

This commit is contained in:
Lev Walkin 2017-09-12 22:39:47 -07:00
parent 0b59763768
commit b48bc2f309
1 changed files with 102 additions and 50 deletions
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152
skeletons/converter-sample.c
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@ -105,6 +105,61 @@ ats_simple_name(enum asn_transfer_syntax syntax) {
}
}
#define OP_OFFSET(fname) (unsigned)(&(((asn_TYPE_operation_t *)0)->fname))
typedef struct {
const char *name;
enum asn_transfer_syntax syntax;
unsigned codec_offset;
const char *full_name;
} syntax_selector;
static syntax_selector input_encodings[] = {
{"ber", ATS_BER, OP_OFFSET(ber_decoder),
"Input is in BER (Basic Encoding Rules) or DER"},
{"oer", ATS_BASIC_OER, OP_OFFSET(oer_decoder),
"Input is in OER (Octet Encoding Rules)"},
{"per", ATS_UNALIGNED_BASIC_PER, OP_OFFSET(uper_decoder),
"Input is in Unaligned PER (Packed Encoding Rules)"},
{"xer", ATS_BASIC_XER, OP_OFFSET(xer_decoder),
"Input is in XER (XML Encoding Rules)"},
{0, ATS_INVALID, 0, 0}};
static syntax_selector output_encodings[] = {
{"der", ATS_DER, OP_OFFSET(der_encoder),
"Output as DER (Distinguished Encoding Rules)"},
{"oer", ATS_CANONICAL_OER, OP_OFFSET(oer_encoder),
"Output as Canonical OER (Octet Encoding Rules)"},
{"per", ATS_UNALIGNED_CANONICAL_PER, OP_OFFSET(uper_encoder),
"Output as Unaligned PER (Packed Encoding Rules)"},
{"xer", ATS_BASIC_XER, OP_OFFSET(xer_encoder),
"Output as XER (XML Encoding Rules)"},
{"text", ATS_NONSTANDARD_PLAINTEXT, OP_OFFSET(print_struct),
"Output as plain semi-structured text"},
{"null", ATS_INVALID, OP_OFFSET(print_struct),
"Verify (decode) input, but do not output"},
{0, ATS_INVALID, 0, 0}};
/*
* Select ASN.1 Transfer Enocoding Syntax by command line name.
*/
static const syntax_selector *
ats_by_name(const char *name, const asn_TYPE_descriptor_t *td,
const syntax_selector *first_element) {
const syntax_selector *element;
for(element = first_element; element->name; element++) {
if(strcmp(element->name, name) == 0) {
if(td && td->op
&& *(const void *const *)(const void *)((const char *)td->op
+ element
->codec_offset)) {
return element;
}
}
}
return NULL;
}
int
main(int ac, char *av[]) {
FILE *binary_out;
@ -113,8 +168,9 @@ main(int ac, char *av[]) {
int number_of_iterations = 1;
int num;
int ch;
const syntax_selector *sel;
enum asn_transfer_syntax isyntax = ATS_INVALID;
enum asn_transfer_syntax osyntax = ATS_INVALID;
enum asn_transfer_syntax osyntax = ATS_BASIC_XER;
#ifndef PDU
if(!pduType) {
@ -128,9 +184,9 @@ main(int ac, char *av[]) {
#endif
/* Figure out if specialty decoder needs to be default */
if(pduType->op->oer_decoder)
if(ats_by_name("oer", pduType, input_encodings))
isyntax = ATS_BASIC_OER;
else if(pduType->op->uper_decoder)
if(ats_by_name("per", pduType, input_encodings))
isyntax = ATS_UNALIGNED_BASIC_PER;
/*
@ -139,27 +195,25 @@ main(int ac, char *av[]) {
while((ch = getopt(ac, av, "i:o:1b:cdn:p:hs:" JUNKOPT)) != -1)
switch(ch) {
case 'i':
if(optarg[0] == 'b') { isyntax = ATS_BER; break; }
if(optarg[0] == 'x') { isyntax = ATS_BASIC_XER; break; }
if(pduType->op->oer_decoder
&& optarg[0] == 'o') { isyntax = ATS_BASIC_OER; break; }
if(pduType->op->uper_decoder
&& optarg[0] == 'p') { isyntax = ATS_UNALIGNED_BASIC_PER; break; }
fprintf(stderr, "-i<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
sel = ats_by_name(optarg, pduType, input_encodings);
if(sel) {
isyntax = sel->syntax;
} else {
fprintf(stderr, "-i<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
}
break;
case 'o':
if(optarg[0] == 'd') { osyntax = ATS_DER; break; }
if(pduType->op->oer_encoder
&& optarg[0] == 'o') { osyntax = ATS_CANONICAL_OER; break; }
if(pduType->op->uper_encoder
&& optarg[0] == 'p') { osyntax = ATS_UNALIGNED_CANONICAL_PER; break; }
if(optarg[0] == 'x') { osyntax = ATS_BASIC_XER; break; }
if(optarg[0] == 't') { osyntax = ATS_NONSTANDARD_PLAINTEXT; break; }
if(optarg[0] == 'n') { osyntax = ATS_INVALID; break; }
fprintf(stderr, "-o<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
sel = ats_by_name(optarg, pduType, output_encodings);
if(sel) {
osyntax = sel->syntax;
} else {
fprintf(stderr, "-o<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
}
break;
case '1':
opt_onepdu = 1;
break;
@ -249,30 +303,21 @@ main(int ac, char *av[]) {
#endif
fprintf(stderr, "Usage: %s [options] <datafile> ...\n", av[0]);
fprintf(stderr, "Where options are:\n");
if(pduType->op->oer_decoder)
fprintf(stderr,
" -ioer Input is in OER (Octet Encoding Rules)%s\n",
isyntax == ATS_BASIC_OER ? " (DEFAULT)" : "");
if(pduType->op->uper_decoder)
fprintf(stderr,
" -iper Input is in Unaligned PER (Packed Encoding Rules)%s\n",
isyntax == ATS_UNALIGNED_BASIC_PER ? " (DEFAULT)" : "");
fprintf(stderr,
" -iber Input is in BER (Basic Encoding Rules)%s\n",
isyntax == ATS_BER ? " (DEFAULT)" : "");
fprintf(stderr,
" -ixer Input is in XER (XML Encoding Rules)\n");
if(pduType->op->oer_encoder)
fprintf(stderr,
" -ooer Output in Canonical OER (Octet Encoding Rules)\n");
if(pduType->op->uper_encoder)
fprintf(stderr,
" -oper Output in Unaligned PER (Packed Encoding Rules)\n");
fprintf(stderr,
" -oder Output in DER (Distinguished Encoding Rules)\n"
" -oxer Output in XER (XML Encoding Rules) (DEFAULT)\n"
" -otext Output in plain semi-structured text (dump)\n"
" -onull Verify (decode) input, but do not output\n");
for(sel = input_encodings; sel->name; sel++) {
if(ats_by_name(sel->name, pduType, sel)) {
fprintf(stderr, " -i%s %s%s\n", sel->name,
sel->full_name,
(sel->syntax == isyntax) ? " (DEFAULT)" : "");
}
}
for(sel = output_encodings; sel->name; sel++) {
if(ats_by_name(sel->name, pduType, sel)) {
fprintf(stderr, " -o%s%s %s%s\n", sel->name,
strlen(sel->name) > 3 ? "" : " ",
sel->full_name,
(sel->syntax == osyntax) ? " (DEFAULT)" : "");
}
}
if(pduType->op->uper_decoder)
fprintf(stderr,
" -per-nopad Assume PER PDUs are not padded (-iper)\n");
@ -306,7 +351,9 @@ main(int ac, char *av[]) {
}
if(isatty(1)) {
const int is_text_output = osyntax == ATS_NONSTANDARD_PLAINTEXT || osyntax == ATS_CANONICAL_XER || osyntax == ATS_BASIC_XER;
const int is_text_output = osyntax == ATS_NONSTANDARD_PLAINTEXT
|| osyntax == ATS_BASIC_XER
|| osyntax == ATS_CANONICAL_XER;
if(is_text_output) {
binary_out = stdout;
} else {
@ -372,7 +419,8 @@ main(int ac, char *av[]) {
fprintf(stderr, "%s: decoded successfully\n", name);
#endif
} else {
erv = asn_encode(NULL, osyntax, pduType, structure, write_out, binary_out);
erv = asn_encode(NULL, osyntax, pduType, structure, write_out,
binary_out);
if(erv.encoded == -1) {
fprintf(stderr, "%s: Cannot convert %s into %s\n", name,
@ -688,10 +736,12 @@ data_decode_from_file(enum asn_transfer_syntax isyntax, asn_TYPE_descriptor_t *p
switch(isyntax) {
case ATS_BER:
case ATS_DER:
rval = ber_decode(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size);
break;
case ATS_BASIC_OER:
case ATS_CANONICAL_OER:
#ifdef ASN_DISABLE_OER_SUPPORT
rval.code = RC_FAIL;
rval.consumed = 0;
@ -701,10 +751,12 @@ data_decode_from_file(enum asn_transfer_syntax isyntax, asn_TYPE_descriptor_t *p
#endif
break;
case ATS_BASIC_XER:
case ATS_CANONICAL_XER:
rval = xer_decode(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size);
break;
case ATS_UNALIGNED_BASIC_PER:
case ATS_UNALIGNED_CANONICAL_PER:
#ifdef ASN_DISABLE_PER_SUPPORT
rval.code = RC_FAIL;
rval.consumed = 0;
@ -794,7 +846,7 @@ data_decode_from_file(enum asn_transfer_syntax isyntax, asn_TYPE_descriptor_t *p
break;
}
DEBUG("Clean up partially decoded structure");
DEBUG("Clean up partially decoded %s", pduType->name);
ASN_STRUCT_FREE(*pduType, structure);
new_offset = DynamicBuffer.bytes_shifted + DynamicBuffer.offset;