X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/6648a2d7bfaf981cb401403eb9b4b717abda6f9f..4035038a041a93a0d6e34d0a4af88479f84dc08d:/projects/stargazer/plugins/other/snmp/asn1/converter-sample.c

diff --git a/projects/stargazer/plugins/other/snmp/asn1/converter-sample.c b/projects/stargazer/plugins/other/snmp/asn1/converter-sample.c
new file mode 100644
index 00000000..6317d8a5
--- /dev/null
+++ b/projects/stargazer/plugins/other/snmp/asn1/converter-sample.c
@@ -0,0 +1,725 @@
+/*
+ * Generic converter template for a selected ASN.1 type.
+ * Copyright (c) 2005, 2006 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * 
+ * To compile with your own ASN.1 type, please redefine the PDU as shown:
+ * 
+ * cc -DPDU=MyCustomType -o myDecoder.o -c converter-sample.c
+ */
+#ifdef	HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <sys/types.h>
+#include <stdlib.h>	/* for atoi(3) */
+#include <unistd.h>	/* for getopt(3) */
+#include <string.h>	/* for strerror(3) */
+#include <sysexits.h>	/* for EX_* exit codes */
+#include <assert.h>	/* for assert(3) */
+#include <errno.h>	/* for errno */
+
+#include <asn_application.h>
+#include <asn_internal.h>	/* for _ASN_DEFAULT_STACK_MAX */
+
+/* Convert "Type" defined by -DPDU into "asn_DEF_Type" */
+#define	ASN_DEF_PDU(t)	asn_DEF_ ## t
+#define	DEF_PDU_Type(t)	ASN_DEF_PDU(t)
+#define	PDU_Type	DEF_PDU_Type(PDU)
+
+extern asn_TYPE_descriptor_t PDU_Type;	/* ASN.1 type to be decoded */
+#ifdef	ASN_PDU_COLLECTION		/* Generated by asn1c: -pdu=... */
+extern asn_TYPE_descriptor_t *asn_pdu_collection[];
+#endif
+
+/*
+ * Open file and parse its contens.
+ */
+static void *data_decode_from_file(asn_TYPE_descriptor_t *asnTypeOfPDU,
+	FILE *file, const char *name, ssize_t suggested_bufsize, int first_pdu);
+static int write_out(const void *buffer, size_t size, void *key);
+static FILE *argument_to_file(char *av[], int idx);
+static char *argument_to_name(char *av[], int idx);
+
+       int opt_debug;	/* -d (or -dd) */
+static int opt_check;	/* -c (constraints checking) */
+static int opt_stack;	/* -s (maximum stack size) */
+static int opt_ippad;	/* -per-padded (PER input is byte-padded) */
+static int opt_onepdu;	/* -1 (decode single PDU) */
+
+/* Input data format selector */
+static enum input_format {
+	INP_BER,	/* -iber: BER input */
+	INP_XER,	/* -ixer: XER input */
+	INP_PER		/* -iper: Unaligned PER input */
+} iform;	/* -i<format> */
+
+/* Output data format selector */
+static enum output_format {
+	OUT_XER,	/* -oxer: XER (XML) output */
+	OUT_DER,	/* -oder: DER (BER) output */
+	OUT_PER,	/* -oper: Unaligned PER output */
+	OUT_TEXT,	/* -otext: semi-structured text */
+	OUT_NULL	/* -onull: No pretty-printing */
+} oform;	/* -o<format> */
+
+/* Debug output function */
+static inline void
+DEBUG(const char *fmt, ...) {
+	va_list ap;
+	if(!opt_debug) return;
+	fprintf(stderr, "AD: ");
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+int
+main(int ac, char *av[]) {
+	static asn_TYPE_descriptor_t *pduType = &PDU_Type;
+	ssize_t suggested_bufsize = 8192;  /* close or equal to stdio buffer */
+	int number_of_iterations = 1;
+	int num;
+	int ch;
+
+	/* Figure out if Unaligned PER needs to be default */
+	if(pduType->uper_decoder)
+		iform = INP_PER;
+
+	/*
+	 * Pocess the command-line argments.
+	 */
+	while((ch = getopt(ac, av, "i:o:1b:cdn:p:hs:")) != -1)
+	switch(ch) {
+	case 'i':
+		if(optarg[0] == 'b') { iform = INP_BER; break; }
+		if(optarg[0] == 'x') { iform = INP_XER; break; }
+		if(pduType->uper_decoder
+		&& optarg[0] == 'p') { iform = INP_PER; break; }
+		fprintf(stderr, "-i<format>: '%s': improper format selector\n",
+			optarg);
+		exit(EX_UNAVAILABLE);
+	case 'o':
+		if(optarg[0] == 'd') { oform = OUT_DER; break; }
+		if(pduType->uper_encoder
+		&& optarg[0] == 'p') { oform = OUT_PER; break; }
+		if(optarg[0] == 'x') { oform = OUT_XER; break; }
+		if(optarg[0] == 't') { oform = OUT_TEXT; break; }
+		if(optarg[0] == 'n') { oform = OUT_NULL; break; }
+		fprintf(stderr, "-o<format>: '%s': improper format selector\n",
+			optarg);
+		exit(EX_UNAVAILABLE);
+	case '1':
+		opt_onepdu = 1;
+		break;
+	case 'b':
+		suggested_bufsize = atoi(optarg);
+		if(suggested_bufsize < 1
+			|| suggested_bufsize > 16 * 1024 * 1024) {
+			fprintf(stderr,
+				"-b %s: Improper buffer size (1..16M)\n",
+				optarg);
+			exit(EX_UNAVAILABLE);
+		}
+		break;
+	case 'c':
+		opt_check = 1;
+		break;
+	case 'd':
+		opt_debug++;	/* Double -dd means ASN.1 debug */
+		break;
+	case 'n':
+		number_of_iterations = atoi(optarg);
+		if(number_of_iterations < 1) {
+			fprintf(stderr,
+				"-n %s: Improper iterations count\n", optarg);
+			exit(EX_UNAVAILABLE);
+		}
+		break;
+	case 'p':
+		if(strcmp(optarg, "er-padded") == 0) {
+			opt_ippad = 1;
+			break;
+		}
+#ifdef	ASN_PDU_COLLECTION
+		if(strcmp(optarg, "list") == 0) {
+			asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
+			fprintf(stderr, "Available PDU types:\n");
+			for(; *pdu; pdu++) printf("%s\n", (*pdu)->name);
+			exit(0);
+		} else if(optarg[0] >= 'A' && optarg[0] <= 'Z') {
+			asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
+			while(*pdu && strcmp((*pdu)->name, optarg)) pdu++;
+			if(*pdu) { pduType = *pdu; break; }
+			fprintf(stderr, "-p %s: Unrecognized PDU\n", optarg);
+		}
+#endif	/* ASN_PDU_COLLECTION */
+		fprintf(stderr, "-p %s: Unrecognized option\n", optarg);
+		exit(EX_UNAVAILABLE);
+	case 's':
+		opt_stack = atoi(optarg);
+		if(opt_stack < 0) {
+			fprintf(stderr,
+				"-s %s: Non-negative value expected\n",
+				optarg);
+			exit(EX_UNAVAILABLE);
+		}
+		break;
+	case 'h':
+	default:
+		fprintf(stderr, "Usage: %s [options] <data.ber> ...\n", av[0]);
+		fprintf(stderr, "Where options are:\n");
+		if(pduType->uper_decoder)
+		fprintf(stderr,
+		"  -iper        Input is in Unaligned PER (Packed Encoding Rules) (DEFAULT)\n");
+		fprintf(stderr,
+		"  -iber        Input is in BER (Basic Encoding Rules)%s\n",
+			iform == INP_PER ? "" : " (DEFAULT)");
+		fprintf(stderr,
+		"  -ixer        Input is in XER (XML Encoding Rules)\n");
+		if(pduType->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");
+		if(pduType->uper_decoder)
+		fprintf(stderr,
+		"  -per-padded  Assume PER PDUs are byte-padded (-iper)\n");
+#ifdef	ASN_PDU_COLLECTION
+		fprintf(stderr,
+		"  -p <PDU>     Specify PDU type to decode\n"
+		"  -p list      List available PDUs\n");
+#endif	/* ASN_PDU_COLLECTION */
+		fprintf(stderr,
+		"  -1           Decode only the first PDU in file\n"
+		"  -b <size>    Set the i/o buffer size (default is %ld)\n"
+		"  -c           Check ASN.1 constraints after decoding\n"
+		"  -d           Enable debugging (-dd is even better)\n"
+		"  -n <num>     Process files <num> times\n"
+		"  -s <size>    Set the stack usage limit (default is %d)\n"
+		, (long)suggested_bufsize, _ASN_DEFAULT_STACK_MAX);
+		exit(EX_USAGE);
+	}
+
+	ac -= optind;
+	av += optind;
+
+	if(ac < 1) {
+		fprintf(stderr, "%s: No input files specified. "
+				"Try '-h' for more information\n",
+				av[-optind]);
+		exit(EX_USAGE);
+	}
+
+	setvbuf(stdout, 0, _IOLBF, 0);
+
+	for(num = 0; num < number_of_iterations; num++) {
+	  int ac_i;
+	  /*
+	   * Process all files in turn.
+	   */
+	  for(ac_i = 0; ac_i < ac; ac_i++) {
+	    asn_enc_rval_t erv;
+	    void *structure;	/* Decoded structure */
+	    FILE *file = argument_to_file(av, ac_i);
+	    char *name = argument_to_name(av, ac_i);
+	    int first_pdu;
+
+	    for(first_pdu = 1; first_pdu || !opt_onepdu; first_pdu = 0) {
+		/*
+		 * Decode the encoded structure from file.
+		 */
+		structure = data_decode_from_file(pduType,
+				file, name, suggested_bufsize, first_pdu);
+		if(!structure) {
+			if(errno) {
+				/* Error message is already printed */
+				exit(EX_DATAERR);
+			} else {
+				/* EOF */
+				break;
+			}
+		}
+
+		/* Check ASN.1 constraints */
+		if(opt_check) {
+			char errbuf[128];
+			size_t errlen = sizeof(errbuf);
+			if(asn_check_constraints(pduType, structure,
+				errbuf, &errlen)) {
+				fprintf(stderr, "%s: ASN.1 constraint "
+					"check failed: %s\n", name, errbuf);
+				exit(EX_DATAERR);
+			}
+		}
+
+		switch(oform) {
+		case OUT_NULL:
+			fprintf(stderr, "%s: decoded successfully\n", name);
+			break;
+		case OUT_TEXT:	/* -otext */
+			asn_fprint(stdout, pduType, structure);
+			break;
+		case OUT_XER:	/* -oxer */
+			if(xer_fprint(stdout, pduType, structure)) {
+				fprintf(stderr,
+					"%s: Cannot convert %s into XML\n",
+					name, pduType->name);
+				exit(EX_UNAVAILABLE);
+			}
+			break;
+		case OUT_DER:
+			erv = der_encode(pduType, structure, write_out, stdout);
+			if(erv.encoded < 0) {
+				fprintf(stderr,
+					"%s: Cannot convert %s into DER\n",
+					name, pduType->name);
+				exit(EX_UNAVAILABLE);
+			}
+			DEBUG("Encoded in %ld bytes of DER", (long)erv.encoded);
+			break;
+		case OUT_PER:
+			erv = uper_encode(pduType, structure, write_out, stdout);
+			if(erv.encoded < 0) {
+				fprintf(stderr,
+				"%s: Cannot convert %s into Unaligned PER\n",
+					name, pduType->name);
+				exit(EX_UNAVAILABLE);
+			}
+			DEBUG("Encoded in %ld bits of UPER", (long)erv.encoded);
+			break;
+		}
+
+		ASN_STRUCT_FREE(*pduType, structure);
+	    }
+
+	    if(file && file != stdin)
+		fclose(file);
+	  }
+	}
+
+	return 0;
+}
+
+static struct dynamic_buffer {
+	uint8_t *data;		/* Pointer to the data bytes */
+	size_t offset;		/* Offset from the start */
+	size_t length;		/* Length of meaningful contents */
+	size_t unbits;		/* Unused bits in the last byte */
+	size_t allocated;	/* Allocated memory for data */
+	int    nreallocs;	/* Number of data reallocations */
+	off_t  bytes_shifted;	/* Number of bytes ever shifted */
+} DynamicBuffer;
+
+static void
+buffer_dump() {
+	uint8_t *p = DynamicBuffer.data + DynamicBuffer.offset;
+	uint8_t *e = p + DynamicBuffer.length - (DynamicBuffer.unbits ? 1 : 0);
+	if(!opt_debug) return;
+	DEBUG("Buffer: { d=%p, o=%ld, l=%ld, u=%ld, a=%ld, s=%ld }",
+		DynamicBuffer.data,
+		(long)DynamicBuffer.offset,
+		(long)DynamicBuffer.length,
+		(long)DynamicBuffer.unbits,
+		(long)DynamicBuffer.allocated,
+		(long)DynamicBuffer.bytes_shifted);
+	for(; p < e; p++) {
+		fprintf(stderr, " %c%c%c%c%c%c%c%c",
+			((*p >> 7) & 1) ? '1' : '0',
+			((*p >> 6) & 1) ? '1' : '0',
+			((*p >> 5) & 1) ? '1' : '0',
+			((*p >> 4) & 1) ? '1' : '0',
+			((*p >> 3) & 1) ? '1' : '0',
+			((*p >> 2) & 1) ? '1' : '0',
+			((*p >> 1) & 1) ? '1' : '0',
+			((*p >> 0) & 1) ? '1' : '0');
+	}
+	if(DynamicBuffer.unbits) {
+		int shift;
+		fprintf(stderr, " ");
+		for(shift = 7; shift >= DynamicBuffer.unbits; shift--)
+			fprintf(stderr, "%c", ((*p >> shift) & 1) ? '1' : '0');
+		fprintf(stderr, " %d:%d\n",
+			DynamicBuffer.length - 1, 8 - DynamicBuffer.unbits);
+	} else {
+		fprintf(stderr, " %d\n", DynamicBuffer.length);
+	}
+}
+
+/*
+ * Move the buffer content left N bits, possibly joining it with
+ * preceeding content.
+ */
+static void
+buffer_shift_left(size_t offset, int bits) {
+	uint8_t *ptr = DynamicBuffer.data + DynamicBuffer.offset + offset;
+	uint8_t *end = DynamicBuffer.data + DynamicBuffer.offset
+			+ DynamicBuffer.length - 1;
+	
+	if(!bits) return;
+
+	DEBUG("Shifting left %d bits off %ld (o=%ld, u=%ld, l=%ld)",
+		bits, (long)offset,
+		(long)DynamicBuffer.offset,
+		(long)DynamicBuffer.unbits,
+		(long)DynamicBuffer.length);
+
+	if(offset) {
+		int right;
+		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 = (char *)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 = (char *)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 */
+		char  *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);
+
+		switch(iform) {
+		case INP_BER:
+			rval = ber_decode(opt_codec_ctx, pduType,
+				(void **)&structure, i_bptr, i_size);
+			break;
+		case INP_XER:
+			rval = xer_decode(opt_codec_ctx, pduType,
+				(void **)&structure, i_bptr, i_size);
+			break;
+		case INP_PER:
+			rval = uper_decode(opt_codec_ctx, pduType,
+				(void **)&structure, i_bptr, i_size, 0,
+				DynamicBuffer.unbits);
+			ecbits = rval.consumed % 8;	/* Extra bits */
+			rval.consumed /= 8; /* Convert to value in bytes! */
+			/* Check if input is byte-padded at the end */
+			if(opt_ippad && ecbits && rval.code == RC_OK) {
+				rval.consumed++;
+				ecbits = 0;
+			}
+			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;
+	}
+
+	/* 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)
+	) {
+		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], "-")) {
+		return 0;	/* Certainly not <stdin> */
+	} else {
+		/* This might be <stdin>, unless `./program -- -` */
+		if(strcmp(av[-1], "--"))
+			return 1;
+		else
+			return 0;
+	}
+}
+
+static FILE *argument_to_file(char *av[], int idx) {
+	return argument_is_stdin(av, idx)
+		? stdin
+		: fopen(av[idx], "r");
+}
+
+static char *argument_to_name(char *av[], int idx) {
+	return argument_is_stdin(av, idx)
+		? "standard input"
+		: av[idx];
+}