mirror of https://github.com/gnss-sdr/gnss-sdr
989 lines
35 KiB
C
989 lines
35 KiB
C
/*
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* Generic converter template for a selected ASN.1 type.
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* Copyright (c) 2005, 2006, 2007 Lev Walkin <vlm@lionet.info>.
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* All rights reserved.
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*
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* To compile with your own ASN.1 type, please redefine the PDU as shown:
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*
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* cc -DPDU=MyCustomType -o myDecoder.o -c converter-sample.c
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <asn_application.h>
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#include <asn_internal.h> /* for _ASN_DEFAULT_STACK_MAX */
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#include <errno.h> /* for errno */
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#include <stdio.h>
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#include <stdlib.h> /* for atoi(3) */
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#include <string.h> /* for strerror(3) */
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#include <sys/types.h>
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#include <sysexits.h> /* for EX_* exit codes */
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#include <unistd.h> /* for getopt(3) */
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/* Convert "Type" defined by -DPDU into "asn_DEF_Type" */
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#define ASN_DEF_PDU(t) asn_DEF_##t
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#define DEF_PDU_Type(t) ASN_DEF_PDU(t)
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#define PDU_Type DEF_PDU_Type(PDU)
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extern asn_TYPE_descriptor_t PDU_Type; /* ASN.1 type to be decoded */
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#ifdef ASN_PDU_COLLECTION /* Generated by asn1c: -pdu=... */
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extern asn_TYPE_descriptor_t *asn_pdu_collection[];
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#endif
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/*
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* Open file and parse its contents.
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*/
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static void *data_decode_from_file(asn_TYPE_descriptor_t *pduType, FILE *file,
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const char *name, ssize_t suggested_bufsize,
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int first_pdu);
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static int write_out(const void *buffer, size_t size, void *key);
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static FILE *argument_to_file(char *av[], int idx);
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static char *argument_to_name(char *av[], int idx);
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int opt_debug; /* -d (or -dd) */
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static int opt_check; /* -c (constraints checking) */
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static int opt_stack; /* -s (maximum stack size) */
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static int opt_nopad; /* -per-nopad (PER input is not padded) */
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static int opt_onepdu; /* -1 (decode single PDU) */
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/* Input data format selector */
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static enum input_format {
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INP_BER, /* -iber: BER input */
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INP_XER, /* -ixer: XER input */
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INP_PER /* -iper: Unaligned PER input */
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} iform; /* -i<format> */
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/* Output data format selector */
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static enum output_format {
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OUT_XER, /* -oxer: XER (XML) output */
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OUT_DER, /* -oder: DER (BER) output */
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OUT_PER, /* -oper: Unaligned PER output */
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OUT_TEXT, /* -otext: semi-structured text */
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OUT_NULL /* -onull: No pretty-printing */
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} oform; /* -o<format> */
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#ifdef JUNKTEST /* Enable -J <probability> */
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#define JUNKOPT "J:"
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static double opt_jprob; /* Junk bit probability */
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static int junk_failures;
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static void junk_bytes_with_probability(uint8_t *, size_t, double prob);
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#else
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#define JUNKOPT
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#endif
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/* Debug output function */
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static inline void DEBUG(const char *fmt, ...)
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{
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va_list ap;
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if (!opt_debug)
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{
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return;
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}
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fprintf(stderr, "AD: ");
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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}
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int main(int ac, char *av[])
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{
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static asn_TYPE_descriptor_t *pduType = &PDU_Type;
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ssize_t suggested_bufsize = 8192; /* close or equal to stdio buffer */
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int number_of_iterations = 1;
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int num;
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int ch;
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/* Figure out if Unaligned PER needs to be default */
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if (pduType->uper_decoder)
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{
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iform = INP_PER;
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}
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/*
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* Process the command-line arguments.
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*/
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while ((ch = getopt(ac, av, "i:o:1b:cdn:p:hs:" JUNKOPT)) != -1)
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{
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switch (ch)
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{
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case 'i':
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if (optarg[0] == 'b')
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{
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iform = INP_BER;
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break;
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}
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if (optarg[0] == 'x')
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{
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iform = INP_XER;
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break;
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}
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if (pduType->uper_decoder && optarg[0] == 'p')
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{
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iform = INP_PER;
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break;
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}
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fprintf(stderr,
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"-i<format>: '%s': improper format selector\n",
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optarg);
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exit(EX_UNAVAILABLE);
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case 'o':
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if (optarg[0] == 'd')
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{
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oform = OUT_DER;
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break;
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}
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if (pduType->uper_encoder && optarg[0] == 'p')
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{
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oform = OUT_PER;
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break;
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}
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if (optarg[0] == 'x')
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{
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oform = OUT_XER;
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break;
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}
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if (optarg[0] == 't')
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{
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oform = OUT_TEXT;
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break;
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}
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if (optarg[0] == 'n')
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{
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oform = OUT_NULL;
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break;
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}
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fprintf(stderr,
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"-o<format>: '%s': improper format selector\n",
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optarg);
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exit(EX_UNAVAILABLE);
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case '1':
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opt_onepdu = 1;
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break;
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case 'b':
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suggested_bufsize = atoi(optarg);
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if (suggested_bufsize < 1 ||
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suggested_bufsize > 16 * 1024 * 1024)
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{
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fprintf(stderr,
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"-b %s: Improper buffer size (1..16M)\n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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case 'c':
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opt_check = 1;
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break;
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case 'd':
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opt_debug++; /* Double -dd means ASN.1 debug */
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break;
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case 'n':
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number_of_iterations = atoi(optarg);
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if (number_of_iterations < 1)
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{
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fprintf(stderr,
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"-n %s: Improper iterations count\n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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case 'p':
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if (strcmp(optarg, "er-nopad") == 0)
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{
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opt_nopad = 1;
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break;
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}
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#ifdef ASN_PDU_COLLECTION
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if (strcmp(optarg, "list") == 0)
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{
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asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
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fprintf(stderr, "Available PDU types:\n");
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for (; *pdu; pdu++) printf("%s\n", (*pdu)->name);
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exit(0);
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}
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else if (optarg[0] >= 'A' && optarg[0] <= 'Z')
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{
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asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
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while (*pdu && strcmp((*pdu)->name, optarg)) pdu++;
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if (*pdu)
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{
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pduType = *pdu;
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break;
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}
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fprintf(stderr, "-p %s: Unrecognized PDU\n",
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optarg);
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}
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#endif /* ASN_PDU_COLLECTION */
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fprintf(stderr, "-p %s: Unrecognized option\n", optarg);
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exit(EX_UNAVAILABLE);
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case 's':
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opt_stack = atoi(optarg);
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if (opt_stack < 0)
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{
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fprintf(stderr,
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"-s %s: Non-negative value expected\n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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#ifdef JUNKTEST
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case 'J':
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opt_jprob = strtod(optarg, 0);
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if (opt_jprob <= 0.0 || opt_jprob > 1.0)
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{
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fprintf(stderr,
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"-J %s: Probability range 0..1 expected \n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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#endif /* JUNKTEST */
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case 'h':
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default:
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#ifdef ASN_CONVERTER_TITLE
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#define _AXS(x) #x
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#define _ASX(x) _AXS(x)
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fprintf(stderr, "%s\n", _ASX(ASN_CONVERTER_TITLE));
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#endif
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fprintf(stderr, "Usage: %s [options] <data.ber> ...\n",
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av[0]);
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fprintf(stderr, "Where options are:\n");
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if (pduType->uper_decoder)
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{
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fprintf(
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stderr,
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" -iper Input is in Unaligned PER (Packed "
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"Encoding Rules) (DEFAULT)\n");
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}
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fprintf(stderr,
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" -iber Input is in BER (Basic Encoding "
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"Rules)%s\n",
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iform == INP_PER ? "" : " (DEFAULT)");
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fprintf(stderr,
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" -ixer Input is in XER (XML Encoding "
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"Rules)\n");
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if (pduType->uper_encoder)
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{
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fprintf(
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stderr,
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" -oper Output in Unaligned PER (Packed "
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"Encoding "
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"Rules)\n");
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}
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fprintf(
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stderr,
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" -oder Output in DER (Distinguished Encoding "
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"Rules)\n"
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" -oxer Output in XER (XML Encoding Rules) "
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"(DEFAULT)\n"
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" -otext Output in plain semi-structured text "
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"(dump)\n"
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" -onull Verify (decode) input, but do not "
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"output\n");
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if (pduType->uper_decoder)
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{
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fprintf(stderr,
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" -per-nopad Assume PER PDUs are not padded "
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"(-iper)\n");
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}
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#ifdef ASN_PDU_COLLECTION
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fprintf(stderr,
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" -p <PDU> Specify PDU type to decode\n"
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" -p list List available PDUs\n");
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#endif /* ASN_PDU_COLLECTION */
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fprintf(
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stderr,
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" -1 Decode only the first PDU in file\n"
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" -b <size> Set the i/o buffer size (default is "
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"%ld)\n"
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" -c Check ASN.1 constraints after "
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"decoding\n"
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" -d Enable debugging (-dd is even better)\n"
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" -n <num> Process files <num> times\n"
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" -s <size> Set the stack usage limit (default is "
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"%d)\n"
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#ifdef JUNKTEST
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" -J <prob> Set random junk test bit garbaging "
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"probability\n"
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#endif
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,
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(long)suggested_bufsize, _ASN_DEFAULT_STACK_MAX);
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exit(EX_USAGE);
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}
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}
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ac -= optind;
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av += optind;
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if (ac < 1)
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{
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fprintf(stderr,
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"%s: No input files specified. "
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"Try '-h' for more information\n",
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av[-optind]);
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exit(EX_USAGE);
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}
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setvbuf(stdout, 0, _IOLBF, 0);
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for (num = 0; num < number_of_iterations; num++)
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{
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int ac_i;
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/*
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* Process all files in turn.
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*/
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for (ac_i = 0; ac_i < ac; ac_i++)
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{
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asn_enc_rval_t erv;
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void *structure; /* Decoded structure */
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FILE *file = argument_to_file(av, ac_i);
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char *name = argument_to_name(av, ac_i);
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int first_pdu;
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for (first_pdu = 1; first_pdu || !opt_onepdu; first_pdu = 0)
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{
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/*
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* Decode the encoded structure from file.
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*/
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structure = data_decode_from_file(
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pduType, file, name, suggested_bufsize,
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first_pdu);
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if (!structure)
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{
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if (errno)
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{
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/* Error message is already printed
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*/
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exit(EX_DATAERR);
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}
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else
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{
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/* EOF */
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break;
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}
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}
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/* Check ASN.1 constraints */
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if (opt_check)
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{
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char errbuf[128];
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size_t errlen = sizeof(errbuf);
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if (asn_check_constraints(pduType,
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structure, errbuf,
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&errlen))
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{
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fprintf(stderr,
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"%s: ASN.1 constraint "
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"check failed: %s\n",
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name, errbuf);
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exit(EX_DATAERR);
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}
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}
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switch (oform)
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{
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case OUT_NULL:
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#ifdef JUNKTEST
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if (opt_jprob == 0.0)
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#endif
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fprintf(
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stderr,
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"%s: decoded successfully\n",
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name);
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break;
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case OUT_TEXT: /* -otext */
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asn_fprint(stdout, pduType, structure);
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break;
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case OUT_XER: /* -oxer */
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if (xer_fprint(stdout, pduType,
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structure))
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{
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fprintf(stderr,
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"%s: Cannot convert %s "
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"into XML\n",
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name, pduType->name);
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exit(EX_UNAVAILABLE);
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}
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break;
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case OUT_DER:
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erv = der_encode(pduType, structure,
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write_out, stdout);
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if (erv.encoded < 0)
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{
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fprintf(stderr,
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"%s: Cannot convert %s "
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"into DER\n",
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name, pduType->name);
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exit(EX_UNAVAILABLE);
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}
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DEBUG("Encoded in %ld bytes of DER",
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(long)erv.encoded);
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break;
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case OUT_PER:
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erv = uper_encode(pduType, structure,
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write_out, stdout);
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if (erv.encoded < 0)
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{
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fprintf(stderr,
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"%s: Cannot convert %s "
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"into Unaligned PER\n",
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name, pduType->name);
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exit(EX_UNAVAILABLE);
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}
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DEBUG("Encoded in %ld bits of UPER",
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(long)erv.encoded);
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break;
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}
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ASN_STRUCT_FREE(*pduType, structure);
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}
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if (file && file != stdin)
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{
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fclose(file);
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}
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}
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}
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#ifdef JUNKTEST
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if (opt_jprob > 0.0)
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{
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fprintf(stderr, "Junked %f OK (%d/%d)\n", opt_jprob, junk_failures,
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number_of_iterations);
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}
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#endif /* JUNKTEST */
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return 0;
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}
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static struct dynamic_buffer
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{
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uint8_t *data; /* Pointer to the data bytes */
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size_t offset; /* Offset from the start */
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size_t length; /* Length of meaningful contents */
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size_t unbits; /* Unused bits in the last byte */
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size_t allocated; /* Allocated memory for data */
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int nreallocs; /* Number of data reallocations */
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off_t bytes_shifted; /* Number of bytes ever shifted */
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} DynamicBuffer;
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static void buffer_dump()
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{
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uint8_t *p = DynamicBuffer.data + DynamicBuffer.offset;
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uint8_t *e = p + DynamicBuffer.length - (DynamicBuffer.unbits ? 1 : 0);
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if (!opt_debug)
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{
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return;
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}
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DEBUG("Buffer: { d=%p, o=%ld, l=%ld, u=%ld, a=%ld, s=%ld }",
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DynamicBuffer.data, (long)DynamicBuffer.offset,
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(long)DynamicBuffer.length, (long)DynamicBuffer.unbits,
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(long)DynamicBuffer.allocated, (long)DynamicBuffer.bytes_shifted);
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for (; p < e; p++)
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{
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fprintf(stderr, " %c%c%c%c%c%c%c%c", ((*p >> 7) & 1) ? '1' : '0',
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((*p >> 6) & 1) ? '1' : '0', ((*p >> 5) & 1) ? '1' : '0',
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((*p >> 4) & 1) ? '1' : '0', ((*p >> 3) & 1) ? '1' : '0',
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((*p >> 2) & 1) ? '1' : '0', ((*p >> 1) & 1) ? '1' : '0',
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((*p >> 0) & 1) ? '1' : '0');
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}
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if (DynamicBuffer.unbits)
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{
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unsigned int shift;
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fprintf(stderr, " ");
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for (shift = 7; shift >= DynamicBuffer.unbits; shift--)
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{
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fprintf(stderr, "%c", ((*p >> shift) & 1) ? '1' : '0');
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}
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fprintf(stderr, " %ld:%ld\n", (long)DynamicBuffer.length - 1,
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(long)8 - DynamicBuffer.unbits);
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}
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else
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{
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fprintf(stderr, " %ld\n", DynamicBuffer.length);
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}
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}
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/*
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* Move the buffer content left N bits, possibly joining it with
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* preceding content.
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*/
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static void buffer_shift_left(size_t offset, int bits)
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{
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uint8_t *ptr = DynamicBuffer.data + DynamicBuffer.offset + offset;
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uint8_t *end =
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DynamicBuffer.data + DynamicBuffer.offset + DynamicBuffer.length - 1;
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if (!bits)
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{
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return;
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}
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DEBUG("Shifting left %d bits off %ld (o=%ld, u=%ld, l=%ld)", bits,
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(long)offset, (long)DynamicBuffer.offset, (long)DynamicBuffer.unbits,
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(long)DynamicBuffer.length);
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if (offset)
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{
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int right;
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|
right = ptr[0] >> (8 - bits);
|
|
|
|
DEBUG("oleft: %c%c%c%c%c%c%c%c", ((ptr[-1] >> 7) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 6) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 5) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 4) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 3) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 2) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 1) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 0) & 1) ? '1' : '0');
|
|
|
|
DEBUG("oriht: %c%c%c%c%c%c%c%c", ((ptr[0] >> 7) & 1) ? '1' : '0',
|
|
((ptr[0] >> 6) & 1) ? '1' : '0',
|
|
((ptr[0] >> 5) & 1) ? '1' : '0',
|
|
((ptr[0] >> 4) & 1) ? '1' : '0',
|
|
((ptr[0] >> 3) & 1) ? '1' : '0',
|
|
((ptr[0] >> 2) & 1) ? '1' : '0',
|
|
((ptr[0] >> 1) & 1) ? '1' : '0',
|
|
((ptr[0] >> 0) & 1) ? '1' : '0');
|
|
|
|
DEBUG(
|
|
"mriht: %c%c%c%c%c%c%c%c", ((right >> 7) & 1) ? '1' : '0',
|
|
((right >> 6) & 1) ? '1' : '0', ((right >> 5) & 1) ? '1' : '0',
|
|
((right >> 4) & 1) ? '1' : '0', ((right >> 3) & 1) ? '1' : '0',
|
|
((right >> 2) & 1) ? '1' : '0', ((right >> 1) & 1) ? '1' : '0',
|
|
((right >> 0) & 1) ? '1' : '0');
|
|
|
|
ptr[-1] = (ptr[-1] & (0xff << bits)) | right;
|
|
|
|
DEBUG("after: %c%c%c%c%c%c%c%c", ((ptr[-1] >> 7) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 6) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 5) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 4) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 3) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 2) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 1) & 1) ? '1' : '0',
|
|
((ptr[-1] >> 0) & 1) ? '1' : '0');
|
|
}
|
|
|
|
buffer_dump();
|
|
|
|
for (; ptr < end; ptr++)
|
|
{
|
|
int right = ptr[1] >> (8 - bits);
|
|
*ptr = (*ptr << bits) | right;
|
|
}
|
|
*ptr <<= bits;
|
|
|
|
DEBUG("Unbits [%d=>", (int)DynamicBuffer.unbits);
|
|
if (DynamicBuffer.unbits == 0)
|
|
{
|
|
DynamicBuffer.unbits += bits;
|
|
}
|
|
else
|
|
{
|
|
DynamicBuffer.unbits += bits;
|
|
if (DynamicBuffer.unbits > 7)
|
|
{
|
|
DynamicBuffer.unbits -= 8;
|
|
DynamicBuffer.length--;
|
|
DynamicBuffer.bytes_shifted++;
|
|
}
|
|
}
|
|
DEBUG("Unbits =>%d]", (int)DynamicBuffer.unbits);
|
|
|
|
buffer_dump();
|
|
|
|
DEBUG("Shifted. Now (o=%ld, u=%ld l=%ld)", (long)DynamicBuffer.offset,
|
|
(long)DynamicBuffer.unbits, (long)DynamicBuffer.length);
|
|
}
|
|
|
|
/*
|
|
* Ensure that the buffer contains at least this amount of free space.
|
|
*/
|
|
static void add_bytes_to_buffer(const void *data2add, size_t bytes)
|
|
{
|
|
if (bytes == 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
DEBUG("=> add_bytes(%ld) { o=%ld l=%ld u=%ld, s=%ld }", (long)bytes,
|
|
(long)DynamicBuffer.offset, (long)DynamicBuffer.length,
|
|
(long)DynamicBuffer.unbits, (long)DynamicBuffer.allocated);
|
|
|
|
if (DynamicBuffer.allocated >=
|
|
(DynamicBuffer.offset + DynamicBuffer.length + bytes))
|
|
{
|
|
DEBUG("\tNo buffer reallocation is necessary");
|
|
}
|
|
else if (bytes <= DynamicBuffer.offset)
|
|
{
|
|
DEBUG("\tContents shifted by %ld", DynamicBuffer.offset);
|
|
|
|
/* Shift the buffer contents */
|
|
memmove(DynamicBuffer.data,
|
|
DynamicBuffer.data + DynamicBuffer.offset,
|
|
DynamicBuffer.length);
|
|
DynamicBuffer.bytes_shifted += DynamicBuffer.offset;
|
|
DynamicBuffer.offset = 0;
|
|
}
|
|
else
|
|
{
|
|
size_t newsize = (DynamicBuffer.allocated << 2) + bytes;
|
|
void *p = MALLOC(newsize);
|
|
if (!p)
|
|
{
|
|
perror("malloc()");
|
|
exit(EX_OSERR);
|
|
}
|
|
memcpy(p, DynamicBuffer.data + DynamicBuffer.offset,
|
|
DynamicBuffer.length);
|
|
FREEMEM(DynamicBuffer.data);
|
|
DynamicBuffer.data = (uint8_t *)p;
|
|
DynamicBuffer.offset = 0;
|
|
DynamicBuffer.allocated = newsize;
|
|
DynamicBuffer.nreallocs++;
|
|
DEBUG("\tBuffer reallocated to %ld (%d time)", newsize,
|
|
DynamicBuffer.nreallocs);
|
|
}
|
|
|
|
memcpy(DynamicBuffer.data + DynamicBuffer.offset + DynamicBuffer.length,
|
|
data2add, bytes);
|
|
DynamicBuffer.length += bytes;
|
|
if (DynamicBuffer.unbits)
|
|
{
|
|
int bits = DynamicBuffer.unbits;
|
|
DynamicBuffer.unbits = 0;
|
|
buffer_shift_left(DynamicBuffer.length - bytes, bits);
|
|
}
|
|
|
|
DEBUG("<= add_bytes(%ld) { o=%ld l=%ld u=%ld, s=%ld }", (long)bytes,
|
|
(long)DynamicBuffer.offset, (long)DynamicBuffer.length,
|
|
(long)DynamicBuffer.unbits, (long)DynamicBuffer.allocated);
|
|
}
|
|
|
|
static void *data_decode_from_file(asn_TYPE_descriptor_t *pduType, FILE *file,
|
|
const char *name, ssize_t suggested_bufsize,
|
|
int on_first_pdu)
|
|
{
|
|
static uint8_t *fbuf;
|
|
static ssize_t fbuf_size;
|
|
static asn_codec_ctx_t s_codec_ctx;
|
|
asn_codec_ctx_t *opt_codec_ctx = 0;
|
|
void *structure = 0;
|
|
asn_dec_rval_t rval;
|
|
size_t old_offset;
|
|
size_t new_offset;
|
|
int tolerate_eof;
|
|
size_t rd;
|
|
|
|
if (!file)
|
|
{
|
|
fprintf(stderr, "%s: %s\n", name, strerror(errno));
|
|
errno = EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
if (opt_stack)
|
|
{
|
|
s_codec_ctx.max_stack_size = opt_stack;
|
|
opt_codec_ctx = &s_codec_ctx;
|
|
}
|
|
|
|
DEBUG("Processing %s", name);
|
|
|
|
/* prepare the file buffer */
|
|
if (fbuf_size != suggested_bufsize)
|
|
{
|
|
fbuf = (uint8_t *)REALLOC(fbuf, suggested_bufsize);
|
|
if (!fbuf)
|
|
{
|
|
perror("realloc()");
|
|
exit(EX_OSERR);
|
|
}
|
|
fbuf_size = suggested_bufsize;
|
|
}
|
|
|
|
if (on_first_pdu)
|
|
{
|
|
DynamicBuffer.offset = 0;
|
|
DynamicBuffer.length = 0;
|
|
DynamicBuffer.unbits = 0;
|
|
DynamicBuffer.allocated = 0;
|
|
DynamicBuffer.bytes_shifted = 0;
|
|
DynamicBuffer.nreallocs = 0;
|
|
}
|
|
|
|
old_offset = DynamicBuffer.bytes_shifted + DynamicBuffer.offset;
|
|
|
|
/* Pretend immediate EOF */
|
|
rval.code = RC_WMORE;
|
|
rval.consumed = 0;
|
|
|
|
for (tolerate_eof = 1; /* Allow EOF first time buffer is non-empty */
|
|
(rd = fread(fbuf, 1, fbuf_size, file)) || feof(file) == 0 ||
|
|
(tolerate_eof && DynamicBuffer.length);)
|
|
{
|
|
int ecbits = 0; /* Extra consumed bits in case of PER */
|
|
uint8_t *i_bptr;
|
|
size_t i_size;
|
|
|
|
/*
|
|
* Copy the data over, or use the original buffer.
|
|
*/
|
|
if (DynamicBuffer.allocated)
|
|
{
|
|
/* Append new data into the existing dynamic buffer */
|
|
add_bytes_to_buffer(fbuf, rd);
|
|
i_bptr = DynamicBuffer.data + DynamicBuffer.offset;
|
|
i_size = DynamicBuffer.length;
|
|
}
|
|
else
|
|
{
|
|
i_bptr = fbuf;
|
|
i_size = rd;
|
|
}
|
|
|
|
DEBUG("Decoding %ld bytes", (long)i_size);
|
|
|
|
#ifdef JUNKTEST
|
|
junk_bytes_with_probability(i_bptr, i_size, opt_jprob);
|
|
#endif
|
|
|
|
switch (iform)
|
|
{
|
|
case INP_BER:
|
|
rval = ber_decode(opt_codec_ctx, pduType, &structure,
|
|
i_bptr, i_size);
|
|
break;
|
|
case INP_XER:
|
|
rval = xer_decode(opt_codec_ctx, pduType, &structure,
|
|
i_bptr, i_size);
|
|
break;
|
|
case INP_PER:
|
|
if (opt_nopad)
|
|
{
|
|
rval = uper_decode(opt_codec_ctx, pduType,
|
|
&structure, i_bptr, i_size, 0,
|
|
DynamicBuffer.unbits);
|
|
}
|
|
else
|
|
{
|
|
rval = uper_decode_complete(opt_codec_ctx, pduType,
|
|
&structure, i_bptr,
|
|
i_size);
|
|
}
|
|
switch (rval.code)
|
|
{
|
|
case RC_OK:
|
|
/* Fall through */
|
|
case RC_FAIL:
|
|
if (opt_nopad)
|
|
{
|
|
/* uper_decode() returns bits! */
|
|
/* Extra bits */
|
|
ecbits = rval.consumed % 8;
|
|
/* Convert into bytes! */
|
|
rval.consumed /= 8;
|
|
}
|
|
break;
|
|
case RC_WMORE:
|
|
/* PER does not support restartability */
|
|
ASN_STRUCT_FREE(*pduType, structure);
|
|
structure = 0;
|
|
rval.consumed = 0;
|
|
/* Continue accumulating data */
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
DEBUG("decode(%ld) consumed %ld+%db (%ld), code %d",
|
|
(long)DynamicBuffer.length, (long)rval.consumed, ecbits,
|
|
(long)i_size, rval.code);
|
|
|
|
if (DynamicBuffer.allocated == 0)
|
|
{
|
|
/*
|
|
* Flush remainder into the intermediate buffer.
|
|
*/
|
|
if (rval.code != RC_FAIL && rval.consumed < rd)
|
|
{
|
|
add_bytes_to_buffer(fbuf + rval.consumed,
|
|
rd - rval.consumed);
|
|
buffer_shift_left(0, ecbits);
|
|
DynamicBuffer.bytes_shifted = rval.consumed;
|
|
rval.consumed = 0;
|
|
ecbits = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Adjust position inside the source buffer.
|
|
*/
|
|
if (DynamicBuffer.allocated)
|
|
{
|
|
DynamicBuffer.offset += rval.consumed;
|
|
DynamicBuffer.length -= rval.consumed;
|
|
}
|
|
else
|
|
{
|
|
DynamicBuffer.bytes_shifted += rval.consumed;
|
|
}
|
|
|
|
switch (rval.code)
|
|
{
|
|
case RC_OK:
|
|
if (ecbits)
|
|
{
|
|
buffer_shift_left(0, ecbits);
|
|
}
|
|
DEBUG("RC_OK, finishing up with %ld+%d",
|
|
(long)rval.consumed, ecbits);
|
|
return structure;
|
|
case RC_WMORE:
|
|
DEBUG(
|
|
"RC_WMORE, continuing read=%ld, cons=%ld "
|
|
" with %ld..%ld-%ld..%ld",
|
|
(long)rd, (long)rval.consumed,
|
|
(long)DynamicBuffer.offset,
|
|
(long)DynamicBuffer.length,
|
|
(long)DynamicBuffer.unbits,
|
|
(long)DynamicBuffer.allocated);
|
|
if (!rd)
|
|
{
|
|
tolerate_eof--;
|
|
}
|
|
continue;
|
|
case RC_FAIL:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
DEBUG("Clean up partially decoded structure");
|
|
ASN_STRUCT_FREE(*pduType, structure);
|
|
|
|
new_offset = DynamicBuffer.bytes_shifted + DynamicBuffer.offset;
|
|
|
|
/*
|
|
* Print a message and return failure only if not EOF,
|
|
* unless this is our first PDU (empty file).
|
|
*/
|
|
if (on_first_pdu || DynamicBuffer.length ||
|
|
new_offset - old_offset > ((iform == INP_XER) ? sizeof("\r\n") - 1 : 0))
|
|
{
|
|
#ifdef JUNKTEST
|
|
/*
|
|
* Nothing's wrong with being unable to decode junk.
|
|
* Simulate EOF.
|
|
*/
|
|
if (opt_jprob != 0.0)
|
|
{
|
|
junk_failures++;
|
|
errno = 0;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
DEBUG("ofp %d, no=%ld, oo=%ld, dbl=%ld", on_first_pdu,
|
|
(long)new_offset, (long)old_offset,
|
|
(long)DynamicBuffer.length);
|
|
fprintf(stderr,
|
|
"%s: "
|
|
"Decode failed past byte %ld: %s\n",
|
|
name, (long)new_offset,
|
|
(rval.code == RC_WMORE) ? "Unexpected end of input"
|
|
: "Input processing error");
|
|
#ifndef ENOMSG
|
|
#define ENOMSG EINVAL
|
|
#endif
|
|
#ifndef EBADMSG
|
|
#define EBADMSG EINVAL
|
|
#endif
|
|
errno = (rval.code == RC_WMORE) ? ENOMSG : EBADMSG;
|
|
}
|
|
else
|
|
{
|
|
/* Got EOF after a few successful PDUs */
|
|
errno = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Dump the buffer out to the specified FILE */
|
|
static int write_out(const void *buffer, size_t size, void *key)
|
|
{
|
|
FILE *fp = (FILE *)key;
|
|
return (fwrite(buffer, 1, size, fp) == size) ? 0 : -1;
|
|
}
|
|
|
|
static int argument_is_stdin(char *av[], int idx)
|
|
{
|
|
if (strcmp(av[idx], "-") != 0)
|
|
{
|
|
return 0; /* Certainly not <stdin> */
|
|
}
|
|
else
|
|
{
|
|
/* This might be <stdin>, unless `./program -- -` */
|
|
if (strcmp(av[-1], "--") != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static FILE *argument_to_file(char *av[], int idx)
|
|
{
|
|
return argument_is_stdin(av, idx) ? stdin : fopen(av[idx], "re");
|
|
}
|
|
|
|
static char *argument_to_name(char *av[], int idx)
|
|
{
|
|
return argument_is_stdin(av, idx) ? "standard input" : av[idx];
|
|
}
|
|
|
|
#ifdef JUNKTEST
|
|
/*
|
|
* Fill bytes with some garbage with specified probability (more or less).
|
|
*/
|
|
static void junk_bytes_with_probability(uint8_t *buf, size_t size, double prob)
|
|
{
|
|
static int junkmode;
|
|
uint8_t *ptr;
|
|
uint8_t *end;
|
|
if (opt_jprob <= 0.0) return;
|
|
for (ptr = buf, end = ptr + size; ptr < end; ptr++)
|
|
{
|
|
int byte = *ptr;
|
|
if (junkmode++ & 1)
|
|
{
|
|
if ((((double)random() / RAND_MAX) < prob))
|
|
byte = random() & 0xff;
|
|
}
|
|
else
|
|
{
|
|
#define BPROB(b) ((((double)random() / RAND_MAX) < prob) ? b : 0)
|
|
byte ^= BPROB(0x80);
|
|
byte ^= BPROB(0x40);
|
|
byte ^= BPROB(0x20);
|
|
byte ^= BPROB(0x10);
|
|
byte ^= BPROB(0x08);
|
|
byte ^= BPROB(0x04);
|
|
byte ^= BPROB(0x02);
|
|
byte ^= BPROB(0x01);
|
|
}
|
|
if (byte != *ptr)
|
|
{
|
|
DEBUG("Junk buf[%d] %02x -> %02x", ptr - buf, *ptr, byte);
|
|
*ptr = byte;
|
|
}
|
|
}
|
|
}
|
|
#endif /* JUNKTEST */
|