asn1_compiler.c 35.5 KB
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/* Simplified ASN.1 notation parser
 *
 * 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.
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <linux/asn1_ber_bytecode.h>

enum token_type {
	DIRECTIVE_ABSENT,
	DIRECTIVE_ALL,
	DIRECTIVE_ANY,
	DIRECTIVE_APPLICATION,
	DIRECTIVE_AUTOMATIC,
	DIRECTIVE_BEGIN,
	DIRECTIVE_BIT,
	DIRECTIVE_BMPString,
	DIRECTIVE_BOOLEAN,
	DIRECTIVE_BY,
	DIRECTIVE_CHARACTER,
	DIRECTIVE_CHOICE,
	DIRECTIVE_CLASS,
	DIRECTIVE_COMPONENT,
	DIRECTIVE_COMPONENTS,
	DIRECTIVE_CONSTRAINED,
	DIRECTIVE_CONTAINING,
	DIRECTIVE_DEFAULT,
	DIRECTIVE_DEFINED,
	DIRECTIVE_DEFINITIONS,
	DIRECTIVE_EMBEDDED,
	DIRECTIVE_ENCODED,
	DIRECTIVE_ENCODING_CONTROL,
	DIRECTIVE_END,
	DIRECTIVE_ENUMERATED,
	DIRECTIVE_EXCEPT,
	DIRECTIVE_EXPLICIT,
	DIRECTIVE_EXPORTS,
	DIRECTIVE_EXTENSIBILITY,
	DIRECTIVE_EXTERNAL,
	DIRECTIVE_FALSE,
	DIRECTIVE_FROM,
	DIRECTIVE_GeneralString,
	DIRECTIVE_GeneralizedTime,
	DIRECTIVE_GraphicString,
	DIRECTIVE_IA5String,
	DIRECTIVE_IDENTIFIER,
	DIRECTIVE_IMPLICIT,
	DIRECTIVE_IMPLIED,
	DIRECTIVE_IMPORTS,
	DIRECTIVE_INCLUDES,
	DIRECTIVE_INSTANCE,
	DIRECTIVE_INSTRUCTIONS,
	DIRECTIVE_INTEGER,
	DIRECTIVE_INTERSECTION,
	DIRECTIVE_ISO646String,
	DIRECTIVE_MAX,
	DIRECTIVE_MIN,
	DIRECTIVE_MINUS_INFINITY,
	DIRECTIVE_NULL,
	DIRECTIVE_NumericString,
	DIRECTIVE_OBJECT,
	DIRECTIVE_OCTET,
	DIRECTIVE_OF,
	DIRECTIVE_OPTIONAL,
	DIRECTIVE_ObjectDescriptor,
	DIRECTIVE_PATTERN,
	DIRECTIVE_PDV,
	DIRECTIVE_PLUS_INFINITY,
	DIRECTIVE_PRESENT,
	DIRECTIVE_PRIVATE,
	DIRECTIVE_PrintableString,
	DIRECTIVE_REAL,
	DIRECTIVE_RELATIVE_OID,
	DIRECTIVE_SEQUENCE,
	DIRECTIVE_SET,
	DIRECTIVE_SIZE,
	DIRECTIVE_STRING,
	DIRECTIVE_SYNTAX,
	DIRECTIVE_T61String,
	DIRECTIVE_TAGS,
	DIRECTIVE_TRUE,
	DIRECTIVE_TeletexString,
	DIRECTIVE_UNION,
	DIRECTIVE_UNIQUE,
	DIRECTIVE_UNIVERSAL,
	DIRECTIVE_UTCTime,
	DIRECTIVE_UTF8String,
	DIRECTIVE_UniversalString,
	DIRECTIVE_VideotexString,
	DIRECTIVE_VisibleString,
	DIRECTIVE_WITH,
	NR__DIRECTIVES,
	TOKEN_ASSIGNMENT = NR__DIRECTIVES,
	TOKEN_OPEN_CURLY,
	TOKEN_CLOSE_CURLY,
	TOKEN_OPEN_SQUARE,
	TOKEN_CLOSE_SQUARE,
	TOKEN_OPEN_ACTION,
	TOKEN_CLOSE_ACTION,
	TOKEN_COMMA,
	TOKEN_NUMBER,
	TOKEN_TYPE_NAME,
	TOKEN_ELEMENT_NAME,
	NR__TOKENS
};

static const unsigned char token_to_tag[NR__TOKENS] = {
	/* EOC goes first */
	[DIRECTIVE_BOOLEAN]		= ASN1_BOOL,
	[DIRECTIVE_INTEGER]		= ASN1_INT,
	[DIRECTIVE_BIT]			= ASN1_BTS,
	[DIRECTIVE_OCTET]		= ASN1_OTS,
	[DIRECTIVE_NULL]		= ASN1_NULL,
	[DIRECTIVE_OBJECT]		= ASN1_OID,
	[DIRECTIVE_ObjectDescriptor]	= ASN1_ODE,
	[DIRECTIVE_EXTERNAL]		= ASN1_EXT,
	[DIRECTIVE_REAL]		= ASN1_REAL,
	[DIRECTIVE_ENUMERATED]		= ASN1_ENUM,
	[DIRECTIVE_EMBEDDED]		= 0,
	[DIRECTIVE_UTF8String]		= ASN1_UTF8STR,
	[DIRECTIVE_RELATIVE_OID]	= ASN1_RELOID,
	/* 14 */
	/* 15 */
	[DIRECTIVE_SEQUENCE]		= ASN1_SEQ,
	[DIRECTIVE_SET]			= ASN1_SET,
	[DIRECTIVE_NumericString]	= ASN1_NUMSTR,
	[DIRECTIVE_PrintableString]	= ASN1_PRNSTR,
	[DIRECTIVE_T61String]		= ASN1_TEXSTR,
	[DIRECTIVE_TeletexString]	= ASN1_TEXSTR,
	[DIRECTIVE_VideotexString]	= ASN1_VIDSTR,
	[DIRECTIVE_IA5String]		= ASN1_IA5STR,
	[DIRECTIVE_UTCTime]		= ASN1_UNITIM,
	[DIRECTIVE_GeneralizedTime]	= ASN1_GENTIM,
	[DIRECTIVE_GraphicString]	= ASN1_GRASTR,
	[DIRECTIVE_VisibleString]	= ASN1_VISSTR,
	[DIRECTIVE_GeneralString]	= ASN1_GENSTR,
	[DIRECTIVE_UniversalString]	= ASN1_UNITIM,
	[DIRECTIVE_CHARACTER]		= ASN1_CHRSTR,
	[DIRECTIVE_BMPString]		= ASN1_BMPSTR,
};

static const char asn1_classes[4][5] = {
	[ASN1_UNIV]	= "UNIV",
	[ASN1_APPL]	= "APPL",
	[ASN1_CONT]	= "CONT",
	[ASN1_PRIV]	= "PRIV"
};

static const char asn1_methods[2][5] = {
	[ASN1_UNIV]	= "PRIM",
	[ASN1_APPL]	= "CONS"
};

static const char *const asn1_universal_tags[32] = {
	"EOC",
	"BOOL",
	"INT",
	"BTS",
	"OTS",
	"NULL",
	"OID",
	"ODE",
	"EXT",
	"REAL",
	"ENUM",
	"EPDV",
	"UTF8STR",
	"RELOID",
	NULL,		/* 14 */
	NULL,		/* 15 */
	"SEQ",
	"SET",
	"NUMSTR",
	"PRNSTR",
	"TEXSTR",
	"VIDSTR",
	"IA5STR",
	"UNITIM",
	"GENTIM",
	"GRASTR",
	"VISSTR",
	"GENSTR",
	"UNISTR",
	"CHRSTR",
	"BMPSTR",
	NULL		/* 31 */
};

static const char *filename;
static const char *grammar_name;
static const char *outputname;
static const char *headername;

static const char *const directives[NR__DIRECTIVES] = {
#define _(X) [DIRECTIVE_##X] = #X
	_(ABSENT),
	_(ALL),
	_(ANY),
	_(APPLICATION),
	_(AUTOMATIC),
	_(BEGIN),
	_(BIT),
	_(BMPString),
	_(BOOLEAN),
	_(BY),
	_(CHARACTER),
	_(CHOICE),
	_(CLASS),
	_(COMPONENT),
	_(COMPONENTS),
	_(CONSTRAINED),
	_(CONTAINING),
	_(DEFAULT),
	_(DEFINED),
	_(DEFINITIONS),
	_(EMBEDDED),
	_(ENCODED),
	[DIRECTIVE_ENCODING_CONTROL] = "ENCODING-CONTROL",
	_(END),
	_(ENUMERATED),
	_(EXCEPT),
	_(EXPLICIT),
	_(EXPORTS),
	_(EXTENSIBILITY),
	_(EXTERNAL),
	_(FALSE),
	_(FROM),
	_(GeneralString),
	_(GeneralizedTime),
	_(GraphicString),
	_(IA5String),
	_(IDENTIFIER),
	_(IMPLICIT),
	_(IMPLIED),
	_(IMPORTS),
	_(INCLUDES),
	_(INSTANCE),
	_(INSTRUCTIONS),
	_(INTEGER),
	_(INTERSECTION),
	_(ISO646String),
	_(MAX),
	_(MIN),
	[DIRECTIVE_MINUS_INFINITY] = "MINUS-INFINITY",
	[DIRECTIVE_NULL] = "NULL",
	_(NumericString),
	_(OBJECT),
	_(OCTET),
	_(OF),
	_(OPTIONAL),
	_(ObjectDescriptor),
	_(PATTERN),
	_(PDV),
	[DIRECTIVE_PLUS_INFINITY] = "PLUS-INFINITY",
	_(PRESENT),
	_(PRIVATE),
	_(PrintableString),
	_(REAL),
	[DIRECTIVE_RELATIVE_OID] = "RELATIVE-OID",
	_(SEQUENCE),
	_(SET),
	_(SIZE),
	_(STRING),
	_(SYNTAX),
	_(T61String),
	_(TAGS),
	_(TRUE),
	_(TeletexString),
	_(UNION),
	_(UNIQUE),
	_(UNIVERSAL),
	_(UTCTime),
	_(UTF8String),
	_(UniversalString),
	_(VideotexString),
	_(VisibleString),
	_(WITH)
};

struct action {
	struct action	*next;
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	char		*name;
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	unsigned char	index;
};

static struct action *action_list;
static unsigned nr_actions;

struct token {
	unsigned short	line;
	enum token_type	token_type : 8;
	unsigned char	size;
	struct action	*action;
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	char		*content;
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	struct type	*type;
};

static struct token *token_list;
static unsigned nr_tokens;
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static bool verbose_opt;
static bool debug_opt;
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#define verbose(fmt, ...) do { if (verbose_opt) printf(fmt, ## __VA_ARGS__); } while (0)
#define debug(fmt, ...) do { if (debug_opt) printf(fmt, ## __VA_ARGS__); } while (0)
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static int directive_compare(const void *_key, const void *_pdir)
{
	const struct token *token = _key;
	const char *const *pdir = _pdir, *dir = *pdir;
	size_t dlen, clen;
	int val;

	dlen = strlen(dir);
	clen = (dlen < token->size) ? dlen : token->size;

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	//debug("cmp(%s,%s) = ", token->content, dir);
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	val = memcmp(token->content, dir, clen);
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	if (val != 0) {
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		//debug("%d [cmp]\n", val);
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		return val;
	}

	if (dlen == token->size) {
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		//debug("0\n");
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		return 0;
	}
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	//debug("%d\n", (int)dlen - (int)token->size);
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	return dlen - token->size; /* shorter -> negative */
}

/*
 * Tokenise an ASN.1 grammar
 */
static void tokenise(char *buffer, char *end)
{
	struct token *tokens;
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	char *line, *nl, *start, *p, *q;
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	unsigned tix, lineno;

	/* Assume we're going to have half as many tokens as we have
	 * characters
	 */
	token_list = tokens = calloc((end - buffer) / 2, sizeof(struct token));
	if (!tokens) {
		perror(NULL);
		exit(1);
	}
	tix = 0;

	lineno = 0;
	while (buffer < end) {
		/* First of all, break out a line */
		lineno++;
		line = buffer;
		nl = memchr(line, '\n', end - buffer);
		if (!nl) {
			buffer = nl = end;
		} else {
			buffer = nl + 1;
			*nl = '\0';
		}

		/* Remove "--" comments */
		p = line;
	next_comment:
		while ((p = memchr(p, '-', nl - p))) {
			if (p[1] == '-') {
				/* Found a comment; see if there's a terminator */
				q = p + 2;
				while ((q = memchr(q, '-', nl - q))) {
					if (q[1] == '-') {
						/* There is - excise the comment */
						q += 2;
						memmove(p, q, nl - q);
						goto next_comment;
					}
					q++;
				}
				*p = '\0';
				nl = p;
				break;
			} else {
				p++;
			}
		}

		p = line;
		while (p < nl) {
			/* Skip white space */
			while (p < nl && isspace(*p))
				*(p++) = 0;
			if (p >= nl)
				break;

			tokens[tix].line = lineno;
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			start = p;
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			/* Handle string tokens */
			if (isalpha(*p)) {
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				const char **dir, *start = p;
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				/* Can be a directive, type name or element
				 * name.  Find the end of the name.
				 */
				q = p + 1;
				while (q < nl && (isalnum(*q) || *q == '-' || *q == '_'))
					q++;
				tokens[tix].size = q - p;
				p = q;

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				tokens[tix].content = malloc(tokens[tix].size + 1);
				if (!tokens[tix].content) {
					perror(NULL);
					exit(1);
				}
				memcpy(tokens[tix].content, start, tokens[tix].size);
				tokens[tix].content[tokens[tix].size] = 0;
				
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				/* If it begins with a lowercase letter then
				 * it's an element name
				 */
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				if (islower(tokens[tix].content[0])) {
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					tokens[tix++].token_type = TOKEN_ELEMENT_NAME;
					continue;
				}

				/* Otherwise we need to search the directive
				 * table
				 */
				dir = bsearch(&tokens[tix], directives,
					      sizeof(directives) / sizeof(directives[1]),
					      sizeof(directives[1]),
					      directive_compare);
				if (dir) {
					tokens[tix++].token_type = dir - directives;
					continue;
				}

				tokens[tix++].token_type = TOKEN_TYPE_NAME;
				continue;
			}

			/* Handle numbers */
			if (isdigit(*p)) {
				/* Find the end of the number */
				q = p + 1;
				while (q < nl && (isdigit(*q)))
					q++;
				tokens[tix].size = q - p;
				p = q;
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				tokens[tix].content = malloc(tokens[tix].size + 1);
				if (!tokens[tix].content) {
					perror(NULL);
					exit(1);
				}
				memcpy(tokens[tix].content, start, tokens[tix].size);
				tokens[tix].content[tokens[tix].size] = 0;
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				tokens[tix++].token_type = TOKEN_NUMBER;
				continue;
			}

			if (nl - p >= 3) {
				if (memcmp(p, "::=", 3) == 0) {
					p += 3;
					tokens[tix].size = 3;
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					tokens[tix].content = "::=";
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					tokens[tix++].token_type = TOKEN_ASSIGNMENT;
					continue;
				}
			}

			if (nl - p >= 2) {
				if (memcmp(p, "({", 2) == 0) {
					p += 2;
					tokens[tix].size = 2;
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					tokens[tix].content = "({";
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					tokens[tix++].token_type = TOKEN_OPEN_ACTION;
					continue;
				}
				if (memcmp(p, "})", 2) == 0) {
					p += 2;
					tokens[tix].size = 2;
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					tokens[tix].content = "})";
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					tokens[tix++].token_type = TOKEN_CLOSE_ACTION;
					continue;
				}
			}

			if (nl - p >= 1) {
				tokens[tix].size = 1;
				switch (*p) {
				case '{':
					p += 1;
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					tokens[tix].content = "{";
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					tokens[tix++].token_type = TOKEN_OPEN_CURLY;
					continue;
				case '}':
					p += 1;
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					tokens[tix].content = "}";
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					tokens[tix++].token_type = TOKEN_CLOSE_CURLY;
					continue;
				case '[':
					p += 1;
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					tokens[tix].content = "[";
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					tokens[tix++].token_type = TOKEN_OPEN_SQUARE;
					continue;
				case ']':
					p += 1;
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					tokens[tix].content = "]";
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					tokens[tix++].token_type = TOKEN_CLOSE_SQUARE;
					continue;
				case ',':
					p += 1;
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					tokens[tix].content = ",";
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					tokens[tix++].token_type = TOKEN_COMMA;
					continue;
				default:
					break;
				}
			}

			fprintf(stderr, "%s:%u: Unknown character in grammar: '%c'\n",
				filename, lineno, *p);
			exit(1);
		}
	}

	nr_tokens = tix;
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	verbose("Extracted %u tokens\n", nr_tokens);
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#if 0
	{
		int n;
		for (n = 0; n < nr_tokens; n++)
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			debug("Token %3u: '%s'\n", n, token_list[n].content);
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	}
#endif
}

static void build_type_list(void);
static void parse(void);
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static void dump_elements(void);
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static void render(FILE *out, FILE *hdr);

/*
 *
 */
int main(int argc, char **argv)
{
	struct stat st;
	ssize_t readlen;
	FILE *out, *hdr;
	char *buffer, *p;
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	char *kbuild_verbose;
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	int fd;

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	kbuild_verbose = getenv("KBUILD_VERBOSE");
	if (kbuild_verbose)
		verbose_opt = atoi(kbuild_verbose);

	while (argc > 4) {
		if (strcmp(argv[1], "-v") == 0)
			verbose_opt = true;
		else if (strcmp(argv[1], "-d") == 0)
			debug_opt = true;
		else
			break;
		memmove(&argv[1], &argv[2], (argc - 2) * sizeof(char *));
		argc--;
	}

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	if (argc != 4) {
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		fprintf(stderr, "Format: %s [-v] [-d] <grammar-file> <c-file> <hdr-file>\n",
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			argv[0]);
		exit(2);
	}

	filename = argv[1];
	outputname = argv[2];
	headername = argv[3];

	fd = open(filename, O_RDONLY);
	if (fd < 0) {
		perror(filename);
		exit(1);
	}

	if (fstat(fd, &st) < 0) {
		perror(filename);
		exit(1);
	}

	if (!(buffer = malloc(st.st_size + 1))) {
		perror(NULL);
		exit(1);
	}

	if ((readlen = read(fd, buffer, st.st_size)) < 0) {
		perror(filename);
		exit(1);
	}

	if (close(fd) < 0) {
		perror(filename);
		exit(1);
	}

	if (readlen != st.st_size) {
		fprintf(stderr, "%s: Short read\n", filename);
		exit(1);
	}

	p = strrchr(argv[1], '/');
	p = p ? p + 1 : argv[1];
	grammar_name = strdup(p);
	if (!p) {
		perror(NULL);
		exit(1);
	}
	p = strchr(grammar_name, '.');
	if (p)
		*p = '\0';

	buffer[readlen] = 0;
	tokenise(buffer, buffer + readlen);
	build_type_list();
	parse();
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	dump_elements();
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	out = fopen(outputname, "w");
	if (!out) {
		perror(outputname);
		exit(1);
	}

	hdr = fopen(headername, "w");
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	if (!hdr) {
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		perror(headername);
		exit(1);
	}

	render(out, hdr);

	if (fclose(out) < 0) {
		perror(outputname);
		exit(1);
	}

	if (fclose(hdr) < 0) {
		perror(headername);
		exit(1);
	}

	return 0;
}

enum compound {
	NOT_COMPOUND,
	SET,
	SET_OF,
	SEQUENCE,
	SEQUENCE_OF,
	CHOICE,
	ANY,
	TYPE_REF,
	TAG_OVERRIDE
};

struct element {
	struct type	*type_def;
	struct token	*name;
	struct token	*type;
	struct action	*action;
	struct element	*children;
	struct element	*next;
	struct element	*render_next;
	struct element	*list_next;
	uint8_t		n_elements;
	enum compound	compound : 8;
	enum asn1_class	class : 8;
	enum asn1_method method : 8;
	uint8_t		tag;
	unsigned	entry_index;
	unsigned	flags;
#define ELEMENT_IMPLICIT	0x0001
#define ELEMENT_EXPLICIT	0x0002
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#define ELEMENT_TAG_SPECIFIED	0x0004
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#define ELEMENT_RENDERED	0x0008
#define ELEMENT_SKIPPABLE	0x0010
#define ELEMENT_CONDITIONAL	0x0020
};

struct type {
	struct token	*name;
	struct token	*def;
	struct element	*element;
	unsigned	ref_count;
	unsigned	flags;
#define TYPE_STOP_MARKER	0x0001
#define TYPE_BEGIN		0x0002
};

static struct type *type_list;
static struct type **type_index;
static unsigned nr_types;

static int type_index_compare(const void *_a, const void *_b)
{
	const struct type *const *a = _a, *const *b = _b;

	if ((*a)->name->size != (*b)->name->size)
		return (*a)->name->size - (*b)->name->size;
	else
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		return memcmp((*a)->name->content, (*b)->name->content,
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			      (*a)->name->size);
}

static int type_finder(const void *_key, const void *_ti)
{
	const struct token *token = _key;
	const struct type *const *ti = _ti;
	const struct type *type = *ti;

	if (token->size != type->name->size)
		return token->size - type->name->size;
	else
743
		return memcmp(token->content, type->name->content,
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792
			      token->size);
}

/*
 * Build up a list of types and a sorted index to that list.
 */
static void build_type_list(void)
{
	struct type *types;
	unsigned nr, t, n;

	nr = 0;
	for (n = 0; n < nr_tokens - 1; n++)
		if (token_list[n + 0].token_type == TOKEN_TYPE_NAME &&
		    token_list[n + 1].token_type == TOKEN_ASSIGNMENT)
			nr++;

	if (nr == 0) {
		fprintf(stderr, "%s: No defined types\n", filename);
		exit(1);
	}

	nr_types = nr;
	types = type_list = calloc(nr + 1, sizeof(type_list[0]));
	if (!type_list) {
		perror(NULL);
		exit(1);
	}
	type_index = calloc(nr, sizeof(type_index[0]));
	if (!type_index) {
		perror(NULL);
		exit(1);
	}

	t = 0;
	types[t].flags |= TYPE_BEGIN;
	for (n = 0; n < nr_tokens - 1; n++) {
		if (token_list[n + 0].token_type == TOKEN_TYPE_NAME &&
		    token_list[n + 1].token_type == TOKEN_ASSIGNMENT) {
			types[t].name = &token_list[n];
			type_index[t] = &types[t];
			t++;
		}
	}
	types[t].name = &token_list[n + 1];
	types[t].flags |= TYPE_STOP_MARKER;

	qsort(type_index, nr, sizeof(type_index[0]), type_index_compare);

793
	verbose("Extracted %u types\n", nr_types);
794 795 796
#if 0
	for (n = 0; n < nr_types; n++) {
		struct type *type = type_index[n];
797
		debug("- %*.*s\n", type->name->content);
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
	}
#endif
}

static struct element *parse_type(struct token **_cursor, struct token *stop,
				  struct token *name);

/*
 * Parse the token stream
 */
static void parse(void)
{
	struct token *cursor;
	struct type *type;

	/* Parse one type definition statement at a time */
	type = type_list;
	do {
		cursor = type->name;

		if (cursor[0].token_type != TOKEN_TYPE_NAME ||
		    cursor[1].token_type != TOKEN_ASSIGNMENT)
			abort();
		cursor += 2;

		type->element = parse_type(&cursor, type[1].name, NULL);
		type->element->type_def = type;

		if (cursor != type[1].name) {
827 828
			fprintf(stderr, "%s:%d: Parse error at token '%s'\n",
				filename, cursor->line, cursor->content);
829 830 831 832 833
			exit(1);
		}

	} while (type++, !(type->flags & TYPE_STOP_MARKER));

834
	verbose("Extracted %u actions\n", nr_actions);
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
}

static struct element *element_list;

static struct element *alloc_elem(struct token *type)
{
	struct element *e = calloc(1, sizeof(*e));
	if (!e) {
		perror(NULL);
		exit(1);
	}
	e->list_next = element_list;
	element_list = e;
	return e;
}

static struct element *parse_compound(struct token **_cursor, struct token *end,
				      int alternates);

/*
 * Parse one type definition statement
 */
static struct element *parse_type(struct token **_cursor, struct token *end,
				  struct token *name)
{
	struct element *top, *element;
	struct action *action, **ppaction;
	struct token *cursor = *_cursor;
	struct type **ref;
	char *p;
	int labelled = 0, implicit = 0;

	top = element = alloc_elem(cursor);
	element->class = ASN1_UNIV;
	element->method = ASN1_PRIM;
	element->tag = token_to_tag[cursor->token_type];
	element->name = name;

	/* Extract the tag value if one given */
	if (cursor->token_type == TOKEN_OPEN_SQUARE) {
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		switch (cursor->token_type) {
		case DIRECTIVE_UNIVERSAL:
			element->class = ASN1_UNIV;
			cursor++;
			break;
		case DIRECTIVE_APPLICATION:
			element->class = ASN1_APPL;
			cursor++;
			break;
		case TOKEN_NUMBER:
			element->class = ASN1_CONT;
			break;
		case DIRECTIVE_PRIVATE:
			element->class = ASN1_PRIV;
			cursor++;
			break;
		default:
895 896
			fprintf(stderr, "%s:%d: Unrecognised tag class token '%s'\n",
				filename, cursor->line, cursor->content);
897 898 899 900 901 902
			exit(1);
		}

		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != TOKEN_NUMBER) {
903 904
			fprintf(stderr, "%s:%d: Missing tag number '%s'\n",
				filename, cursor->line, cursor->content);
905 906 907 908
			exit(1);
		}

		element->tag &= ~0x1f;
909
		element->tag |= strtoul(cursor->content, &p, 10);
910
		element->flags |= ELEMENT_TAG_SPECIFIED;
911
		if (p - cursor->content != cursor->size)
912 913 914 915 916 917
			abort();
		cursor++;

		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != TOKEN_CLOSE_SQUARE) {
918 919
			fprintf(stderr, "%s:%d: Missing closing square bracket '%s'\n",
				filename, cursor->line, cursor->content);
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
			exit(1);
		}
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		labelled = 1;
	}

	/* Handle implicit and explicit markers */
	if (cursor->token_type == DIRECTIVE_IMPLICIT) {
		element->flags |= ELEMENT_IMPLICIT;
		implicit = 1;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
	} else if (cursor->token_type == DIRECTIVE_EXPLICIT) {
		element->flags |= ELEMENT_EXPLICIT;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
	}

	if (labelled) {
		if (!implicit)
			element->method |= ASN1_CONS;
		element->compound = implicit ? TAG_OVERRIDE : SEQUENCE;
		element->children = alloc_elem(cursor);
		element = element->children;
		element->class = ASN1_UNIV;
		element->method = ASN1_PRIM;
		element->tag = token_to_tag[cursor->token_type];
		element->name = name;
	}

	/* Extract the type we're expecting here */
	element->type = cursor;
	switch (cursor->token_type) {
	case DIRECTIVE_ANY:
		element->compound = ANY;
		cursor++;
		break;

	case DIRECTIVE_NULL:
	case DIRECTIVE_BOOLEAN:
	case DIRECTIVE_ENUMERATED:
	case DIRECTIVE_INTEGER:
		element->compound = NOT_COMPOUND;
		cursor++;
		break;

	case DIRECTIVE_EXTERNAL:
		element->method = ASN1_CONS;

	case DIRECTIVE_BMPString:
	case DIRECTIVE_GeneralString:
	case DIRECTIVE_GraphicString:
	case DIRECTIVE_IA5String:
	case DIRECTIVE_ISO646String:
	case DIRECTIVE_NumericString:
	case DIRECTIVE_PrintableString:
	case DIRECTIVE_T61String:
	case DIRECTIVE_TeletexString:
	case DIRECTIVE_UniversalString:
	case DIRECTIVE_UTF8String:
	case DIRECTIVE_VideotexString:
	case DIRECTIVE_VisibleString:
	case DIRECTIVE_ObjectDescriptor:
	case DIRECTIVE_GeneralizedTime:
	case DIRECTIVE_UTCTime:
		element->compound = NOT_COMPOUND;
		cursor++;
		break;

	case DIRECTIVE_BIT:
	case DIRECTIVE_OCTET:
		element->compound = NOT_COMPOUND;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != DIRECTIVE_STRING)
			goto parse_error;
		cursor++;
		break;

	case DIRECTIVE_OBJECT:
		element->compound = NOT_COMPOUND;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != DIRECTIVE_IDENTIFIER)
			goto parse_error;
		cursor++;
		break;

	case TOKEN_TYPE_NAME:
		element->compound = TYPE_REF;
		ref = bsearch(cursor, type_index, nr_types, sizeof(type_index[0]),
			      type_finder);
		if (!ref) {
1019 1020
			fprintf(stderr, "%s:%d: Type '%s' undefined\n",
				filename, cursor->line, cursor->content);
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
			exit(1);
		}
		cursor->type = *ref;
		(*ref)->ref_count++;
		cursor++;
		break;

	case DIRECTIVE_CHOICE:
		element->compound = CHOICE;
		cursor++;
		element->children = parse_compound(&cursor, end, 1);
		break;

	case DIRECTIVE_SEQUENCE:
		element->compound = SEQUENCE;
		element->method = ASN1_CONS;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type == DIRECTIVE_OF) {
			element->compound = SEQUENCE_OF;
			cursor++;
			if (cursor >= end)
				goto overrun_error;
			element->children = parse_type(&cursor, end, NULL);
		} else {
			element->children = parse_compound(&cursor, end, 0);
		}
		break;

	case DIRECTIVE_SET:
		element->compound = SET;
		element->method = ASN1_CONS;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type == DIRECTIVE_OF) {
			element->compound = SET_OF;
			cursor++;
			if (cursor >= end)
				goto parse_error;
			element->children = parse_type(&cursor, end, NULL);
		} else {
			element->children = parse_compound(&cursor, end, 1);
		}
		break;

	default:
1069 1070
		fprintf(stderr, "%s:%d: Token '%s' does not introduce a type\n",
			filename, cursor->line, cursor->content);
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
		exit(1);
	}

	/* Handle elements that are optional */
	if (cursor < end && (cursor->token_type == DIRECTIVE_OPTIONAL ||
			     cursor->token_type == DIRECTIVE_DEFAULT)
	    ) {
		cursor++;
		top->flags |= ELEMENT_SKIPPABLE;
	}

	if (cursor < end && cursor->token_type == TOKEN_OPEN_ACTION) {
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != TOKEN_ELEMENT_NAME) {
1087 1088
			fprintf(stderr, "%s:%d: Token '%s' is not an action function name\n",
				filename, cursor->line, cursor->content);
1089 1090 1091
			exit(1);
		}

1092
		action = malloc(sizeof(struct action));
1093 1094 1095 1096 1097
		if (!action) {
			perror(NULL);
			exit(1);
		}
		action->index = 0;
1098
		action->name = cursor->content;
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127

		for (ppaction = &action_list;
		     *ppaction;
		     ppaction = &(*ppaction)->next
		     ) {
			int cmp = strcmp(action->name, (*ppaction)->name);
			if (cmp == 0) {
				free(action);
				action = *ppaction;
				goto found;
			}
			if (cmp < 0) {
				action->next = *ppaction;
				*ppaction = action;
				nr_actions++;
				goto found;
			}
		}
		action->next = NULL;
		*ppaction = action;
		nr_actions++;
	found:

		element->action = action;
		cursor->action = action;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != TOKEN_CLOSE_ACTION) {
1128 1129
			fprintf(stderr, "%s:%d: Missing close action, got '%s'\n",
				filename, cursor->line, cursor->content);
1130 1131 1132 1133 1134 1135 1136 1137 1138
			exit(1);
		}
		cursor++;
	}

	*_cursor = cursor;
	return top;

parse_error:
1139 1140
	fprintf(stderr, "%s:%d: Unexpected token '%s'\n",
		filename, cursor->line, cursor->content);
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
	exit(1);

overrun_error:
	fprintf(stderr, "%s: Unexpectedly hit EOF\n", filename);
	exit(1);
}

/*
 * Parse a compound type list
 */
static struct element *parse_compound(struct token **_cursor, struct token *end,
				      int alternates)
{
	struct element *children, **child_p = &children, *element;
	struct token *cursor = *_cursor, *name;

	if (cursor->token_type != TOKEN_OPEN_CURLY) {
1158 1159
		fprintf(stderr, "%s:%d: Expected compound to start with brace not '%s'\n",
			filename, cursor->line, cursor->content);
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
		exit(1);
	}
	cursor++;
	if (cursor >= end)
		goto overrun_error;

	if (cursor->token_type == TOKEN_OPEN_CURLY) {
		fprintf(stderr, "%s:%d: Empty compound\n",
			filename, cursor->line);
		exit(1);
	}

	for (;;) {
		name = NULL;
		if (cursor->token_type == TOKEN_ELEMENT_NAME) {
			name = cursor;
			cursor++;
			if (cursor >= end)
				goto overrun_error;
		}

		element = parse_type(&cursor, end, name);
		if (alternates)
			element->flags |= ELEMENT_SKIPPABLE | ELEMENT_CONDITIONAL;

		*child_p = element;
		child_p = &element->next;

		if (cursor >= end)
			goto overrun_error;
		if (cursor->token_type != TOKEN_COMMA)
			break;
		cursor++;
		if (cursor >= end)
			goto overrun_error;
	}

	children->flags &= ~ELEMENT_CONDITIONAL;

	if (cursor->token_type != TOKEN_CLOSE_CURLY) {
1200 1201
		fprintf(stderr, "%s:%d: Expected compound closure, got '%s'\n",
			filename, cursor->line, cursor->content);
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
		exit(1);
	}
	cursor++;

	*_cursor = cursor;
	return children;

overrun_error:
	fprintf(stderr, "%s: Unexpectedly hit EOF\n", filename);
	exit(1);
}

1214 1215 1216 1217
static void dump_element(const struct element *e, int level)
{
	const struct element *c;
	const struct type *t = e->type_def;
1218 1219
	const char *name = e->name ? e->name->content : ".";
	const char *tname = t && t->name ? t->name->content : ".";
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
	char tag[32];

	if (e->class == 0 && e->method == 0 && e->tag == 0)
		strcpy(tag, "<...>");
	else if (e->class == ASN1_UNIV)
		sprintf(tag, "%s %s %s",
			asn1_classes[e->class],
			asn1_methods[e->method],
			asn1_universal_tags[e->tag]);
	else
		sprintf(tag, "%s %s %u",
			asn1_classes[e->class],
			asn1_methods[e->method],
			e->tag);

1235
	printf("%c%c%c%c%c %c %*s[*] \e[33m%s\e[m %s %s \e[35m%s\e[m\n",
1236 1237 1238 1239 1240 1241 1242 1243
	       e->flags & ELEMENT_IMPLICIT ? 'I' : '-',
	       e->flags & ELEMENT_EXPLICIT ? 'E' : '-',
	       e->flags & ELEMENT_TAG_SPECIFIED ? 'T' : '-',
	       e->flags & ELEMENT_SKIPPABLE ? 'S' : '-',
	       e->flags & ELEMENT_CONDITIONAL ? 'C' : '-',
	       "-tTqQcaro"[e->compound],
	       level, "",
	       tag,
1244 1245
	       tname,
	       name,
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	       e->action ? e->action->name : "");
	if (e->compound == TYPE_REF)
		dump_element(e->type->type->element, level + 3);
	else
		for (c = e->children; c; c = c->next)
			dump_element(c, level + 3);
}

static void dump_elements(void)
{
	if (debug_opt)
		dump_element(type_list[0].element, 0);
}

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
static void render_element(FILE *out, struct element *e, struct element *tag);
static void render_out_of_line_list(FILE *out);

static int nr_entries;
static int render_depth = 1;
static struct element *render_list, **render_list_p = &render_list;

__attribute__((format(printf, 2, 3)))
static void render_opcode(FILE *out, const char *fmt, ...)
{
	va_list va;

	if (out) {
		fprintf(out, "\t[%4d] =%*s", nr_entries, render_depth, "");
		va_start(va, fmt);
		vfprintf(out, fmt, va);
		va_end(va);
	}
	nr_entries++;
}

__attribute__((format(printf, 2, 3)))
static void render_more(FILE *out, const char *fmt, ...)
{
	va_list va;

	if (out) {
		va_start(va, fmt);
		vfprintf(out, fmt, va);
		va_end(va);
	}
}

/*
 * Render the grammar into a state machine definition.
 */
static void render(FILE *out, FILE *hdr)
{
	struct element *e;
	struct action *action;
	struct type *root;
	int index;

	fprintf(hdr, "/*\n");
	fprintf(hdr, " * Automatically generated by asn1_compiler.  Do not edit\n");
	fprintf(hdr, " *\n");
	fprintf(hdr, " * ASN.1 parser for %s\n", grammar_name);
	fprintf(hdr, " */\n");
	fprintf(hdr, "#include <linux/asn1_decoder.h>\n");
	fprintf(hdr, "\n");
	fprintf(hdr, "extern const struct asn1_decoder %s_decoder;\n", grammar_name);
	if (ferror(hdr)) {
		perror(headername);
		exit(1);
	}

	fprintf(out, "/*\n");
	fprintf(out, " * Automatically generated by asn1_compiler.  Do not edit\n");
	fprintf(out, " *\n");
	fprintf(out, " * ASN.1 parser for %s\n", grammar_name);
	fprintf(out, " */\n");
	fprintf(out, "#include <linux/asn1_ber_bytecode.h>\n");
	fprintf(out, "#include \"%s-asn1.h\"\n", grammar_name);
	fprintf(out, "\n");
	if (ferror(out)) {
		perror(outputname);
		exit(1);
	}

	/* Tabulate the action functions we might have to call */
	fprintf(hdr, "\n");
	index = 0;
	for (action = action_list; action; action = action->next) {
		action->index = index++;
		fprintf(hdr,
			"extern int %s(void *, size_t, unsigned char,"
			" const void *, size_t);\n",
			action->name);
	}
	fprintf(hdr, "\n");

	fprintf(out, "enum %s_actions {\n", grammar_name);
	for (action = action_list; action; action = action->next)
		fprintf(out, "\tACT_%s = %u,\n",
			action->name, action->index);
	fprintf(out, "\tNR__%s_actions = %u\n", grammar_name, nr_actions);
	fprintf(out, "};\n");

	fprintf(out, "\n");
	fprintf(out, "static const asn1_action_t %s_action_table[NR__%s_actions] = {\n",
		grammar_name, grammar_name);
	for (action = action_list; action; action = action->next)
		fprintf(out, "\t[%4u] = %s,\n", action->index, action->name);
	fprintf(out, "};\n");

	if (ferror(out)) {
		perror(outputname);
		exit(1);
	}

	/* We do two passes - the first one calculates all the offsets */
1361
	verbose("Pass 1\n");
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
	nr_entries = 0;
	root = &type_list[0];
	render_element(NULL, root->element, NULL);
	render_opcode(NULL, "ASN1_OP_COMPLETE,\n");
	render_out_of_line_list(NULL);

	for (e = element_list; e; e = e->list_next)
		e->flags &= ~ELEMENT_RENDERED;

	/* And then we actually render */
1372
	verbose("Pass 2\n");
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
	fprintf(out, "\n");
	fprintf(out, "static const unsigned char %s_machine[] = {\n",
		grammar_name);

	nr_entries = 0;
	root = &type_list[0];
	render_element(out, root->element, NULL);
	render_opcode(out, "ASN1_OP_COMPLETE,\n");
	render_out_of_line_list(out);

	fprintf(out, "};\n");

	fprintf(out, "\n");
	fprintf(out, "const struct asn1_decoder %s_decoder = {\n", grammar_name);
	fprintf(out, "\t.machine = %s_machine,\n", grammar_name);
	fprintf(out, "\t.machlen = sizeof(%s_machine),\n", grammar_name);
	fprintf(out, "\t.actions = %s_action_table,\n", grammar_name);
	fprintf(out, "};\n");
}

/*
 * Render the out-of-line elements
 */
static void render_out_of_line_list(FILE *out)
{
	struct element *e, *ce;
	const char *act;
	int entry;

	while ((e = render_list)) {
		render_list = e->render_next;
		if (!render_list)
			render_list_p = &render_list;

		render_more(out, "\n");
		e->entry_index = entry = nr_entries;
		render_depth++;
		for (ce = e->children; ce; ce = ce->next)
			render_element(out, ce, NULL);
		render_depth--;

		act = e->action ? "_ACT" : "";
		switch (e->compound) {
		case SEQUENCE:
			render_opcode(out, "ASN1_OP_END_SEQ%s,\n", act);
			break;
		case SEQUENCE_OF:
			render_opcode(out, "ASN1_OP_END_SEQ_OF%s,\n", act);
			render_opcode(out, "_jump_target(%u),\n", entry);
			break;
		case SET:
			render_opcode(out, "ASN1_OP_END_SET%s,\n", act);
			break;
		case SET_OF:
			render_opcode(out, "ASN1_OP_END_SET_OF%s,\n", act);
			render_opcode(out, "_jump_target(%u),\n", entry);
			break;
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		default:
			break;
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		}
		if (e->action)
			render_opcode(out, "_action(ACT_%s),\n",
				      e->action->name);
		render_opcode(out, "ASN1_OP_RETURN,\n");
	}
}

/*
 * Render an element.
 */
static void render_element(FILE *out, struct element *e, struct element *tag)
{
1445
	struct element *ec, *x;
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
	const char *cond, *act;
	int entry, skippable = 0, outofline = 0;

	if (e->flags & ELEMENT_SKIPPABLE ||
	    (tag && tag->flags & ELEMENT_SKIPPABLE))
		skippable = 1;

	if ((e->type_def && e->type_def->ref_count > 1) ||
	    skippable)
		outofline = 1;

	if (e->type_def && out) {
1458
		render_more(out, "\t// %s\n", e->type_def->name->content);
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	}

	/* Render the operation */
	cond = (e->flags & ELEMENT_CONDITIONAL ||
		(tag && tag->flags & ELEMENT_CONDITIONAL)) ? "COND_" : "";
	act = e->action ? "_ACT" : "";
	switch (e->compound) {
	case ANY:
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		render_opcode(out, "ASN1_OP_%sMATCH_ANY%s%s,",
			      cond, act, skippable ? "_OR_SKIP" : "");
1469
		if (e->name)
1470
			render_more(out, "\t\t// %s", e->name->content);
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		render_more(out, "\n");
		goto dont_render_tag;

	case TAG_OVERRIDE:
		render_element(out, e->children, e);
		return;

	case SEQUENCE:
	case SEQUENCE_OF:
	case SET:
	case SET_OF:
		render_opcode(out, "ASN1_OP_%sMATCH%s%s,",
			      cond,
			      outofline ? "_JUMP" : "",
			      skippable ? "_OR_SKIP" : "");
		break;

	case CHOICE:
		goto dont_render_tag;

	case TYPE_REF:
		if (e->class == ASN1_UNIV && e->method == ASN1_PRIM && e->tag == 0)
			goto dont_render_tag;
	default:
		render_opcode(out, "ASN1_OP_%sMATCH%s%s,",
			      cond, act,
			      skippable ? "_OR_SKIP" : "");
		break;
	}

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	x = tag ?: e;
	if (x->name)
1503
		render_more(out, "\t\t// %s", x->name->content);
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	render_more(out, "\n");

	/* Render the tag */
1507
	if (!tag || !(tag->flags & ELEMENT_TAG_SPECIFIED))
1508
		tag = e;
1509

1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
	if (tag->class == ASN1_UNIV &&
	    tag->tag != 14 &&
	    tag->tag != 15 &&
	    tag->tag != 31)
		render_opcode(out, "_tag(%s, %s, %s),\n",
			      asn1_classes[tag->class],
			      asn1_methods[tag->method | e->method],
			      asn1_universal_tags[tag->tag]);
	else
		render_opcode(out, "_tagn(%s, %s, %2u),\n",
			      asn1_classes[tag->class],
			      asn1_methods[tag->method | e->method],
			      tag->tag);
	tag = NULL;
dont_render_tag:

	/* Deal with compound types */
	switch (e->compound) {
	case TYPE_REF:
		render_element(out, e->type->type->element, tag);
		if (e->action)
1531 1532
			render_opcode(out, "ASN1_OP_%sACT,\n",
				      skippable ? "MAYBE_" : "");
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		break;

	case SEQUENCE:
		if (outofline) {
			/* Render out-of-line for multiple use or
			 * skipability */
			render_opcode(out, "_jump_target(%u),", e->entry_index);
			if (e->type_def && e->type_def->name)
1541 1542
				render_more(out, "\t\t// --> %s",
					    e->type_def->name->content);
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			render_more(out, "\n");
			if (!(e->flags & ELEMENT_RENDERED)) {
				e->flags |= ELEMENT_RENDERED;
				*render_list_p = e;
				render_list_p = &e->render_next;
			}
			return;
		} else {
			/* Render inline for single use */
			render_depth++;
			for (ec = e->children; ec; ec = ec->next)
				render_element(out, ec, NULL);
			render_depth--;
			render_opcode(out, "ASN1_OP_END_SEQ%s,\n", act);
		}
		break;

	case SEQUENCE_OF:
	case SET_OF:
		if (outofline) {
			/* Render out-of-line for multiple use or
			 * skipability */
			render_opcode(out, "_jump_target(%u),", e->entry_index);
			if (e->type_def && e->type_def->name)
1567 1568
				render_more(out, "\t\t// --> %s",
					    e->type_def->name->content);
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			render_more(out, "\n");
			if (!(e->flags & ELEMENT_RENDERED)) {
				e->flags |= ELEMENT_RENDERED;
				*render_list_p = e;
				render_list_p = &e->render_next;
			}
			return;
		} else {
			/* Render inline for single use */
			entry = nr_entries;
			render_depth++;
			render_element(out, e->children, NULL);
			render_depth--;
			if (e->compound == SEQUENCE_OF)
				render_opcode(out, "ASN1_OP_END_SEQ_OF%s,\n", act);
			else
				render_opcode(out, "ASN1_OP_END_SET_OF%s,\n", act);
			render_opcode(out, "_jump_target(%u),\n", entry);
		}
		break;

	case SET:
		/* I can't think of a nice way to do SET support without having
		 * a stack of bitmasks to make sure no element is repeated.
		 * The bitmask has also to be checked that no non-optional
		 * elements are left out whilst not preventing optional
		 * elements from being left out.
		 */
		fprintf(stderr, "The ASN.1 SET type is not currently supported.\n");
		exit(1);

	case CHOICE:
		for (ec = e->children; ec; ec = ec->next)
1602
			render_element(out, ec, ec);
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		if (!skippable)
			render_opcode(out, "ASN1_OP_COND_FAIL,\n");
		if (e->action)
			render_opcode(out, "ASN1_OP_ACT,\n");
		break;

	default:
		break;
	}

	if (e->action)
		render_opcode(out, "_action(ACT_%s),\n", e->action->name);
}