/* radare - LGPL - Copyright 2009-2020 - pancake, nibble */

#include <r_anal.h>
#include <r_sign.h>
#include <r_search.h>
#include <r_core.h>

R_LIB_VERSION (r_sign);

#define SIGN_DIFF_MATCH_BYTES_THRESHOLD 1.0
#define SIGN_DIFF_MATCH_GRAPH_THRESHOLD 1.0

const char *getRealRef(RCore *core, ut64 off) {
	RFlagItem *item;
	RListIter *iter;

	const RList *list = r_flag_get_list (core->flags, off);
	if (!list) {
		return NULL;
	}

	r_list_foreach (list, iter, item) {
		if (!item->name) {
			continue;
		}
		if (strncmp (item->name, "sym.", 4)) {
			continue;
		}
		return item->name;
	}

	return NULL;
}

R_API RList *r_sign_fcn_vars(RAnal *a, RAnalFunction *fcn) {
	r_return_val_if_fail (a && fcn, NULL);

	RCore *core = a->coreb.core;

	if (!core) {
		return NULL;
	}

	RListIter *iter;
	RAnalVar *var;
	RList *ret = r_list_newf ((RListFree) free);
	if (!ret) {
		return NULL;
	}
	RList *reg_vars = r_anal_var_list (core->anal, fcn, R_ANAL_VAR_KIND_REG);
	RList *spv_vars = r_anal_var_list (core->anal, fcn, R_ANAL_VAR_KIND_SPV);
	RList *bpv_vars = r_anal_var_list (core->anal, fcn, R_ANAL_VAR_KIND_BPV);
	r_list_foreach (bpv_vars, iter, var) {
		r_list_append (ret, r_str_newf ("b%d", var->delta));
	}
	r_list_foreach (spv_vars, iter, var) {
		r_list_append (ret, r_str_newf ("s%d", var->delta));
	}
	r_list_foreach (reg_vars, iter, var) {
		r_list_append (ret, r_str_newf ("r%d", var->delta));
	}
	r_list_free (reg_vars);
	r_list_free (bpv_vars);
	r_list_free (spv_vars);
	return ret;
}

R_API RList *r_sign_fcn_types(RAnal *a, RAnalFunction *fcn) {

	// From anal/types/*:
	// Get key-value types from sdb matching "func.%s", fcn->name
	// Get func.%s.args (number of args)
	// Get type,name pairs
	// Put everything in RList following the next format:
	// types: main.ret=%type%, main.args=%num%, main.arg.0="int,argc", ...

	r_return_val_if_fail (a && fcn, NULL);

	RList *ret = r_list_newf ((RListFree) free);
	if (!ret) {
		return NULL;
	}

	char *scratch = r_str_newf ("func.%s.args", fcn->name);
	if (!scratch) {
		return NULL;
	}
	const char *fcntypes = sdb_const_get (a->sdb_types, scratch, 0);
	free (scratch);

	scratch = r_str_newf ("func.%s.ret", fcn->name);
	if (!scratch) {
		return NULL;
	}
	const char *ret_type = sdb_const_get (a->sdb_types, scratch, 0);
	free (scratch);

	if (fcntypes) {
		if (ret_type) {
			r_list_append (ret, r_str_newf ("func.%s.ret=%s", fcn->name, ret_type));
		}
		int argc = atoi (fcntypes);
		r_list_append (ret, r_str_newf ("func.%s.args=%d", fcn->name, argc));
		int i;
		for (i = 0; i < argc; i++) {
			const char *arg = sdb_const_get (a->sdb_types, r_str_newf ("func.%s.arg.%d", fcn->name, i), 0);
			r_list_append (ret, r_str_newf ("func.%s.arg.%d=\"%s\"", fcn->name, i, arg));
		}
	}

	return ret;
}

R_API RList *r_sign_fcn_xrefs(RAnal *a, RAnalFunction *fcn) {
	RListIter *iter = NULL;
	RAnalRef *refi = NULL;

	r_return_val_if_fail (a && fcn, NULL);

	RCore *core = a->coreb.core;

	if (!core) {
		return NULL;
	}

	RList *ret = r_list_newf ((RListFree) free);
	RList *xrefs = r_anal_function_get_xrefs (fcn);
	r_list_foreach (xrefs, iter, refi) {
		if (refi->type == R_ANAL_REF_TYPE_CODE || refi->type == R_ANAL_REF_TYPE_CALL) {
			const char *flag = getRealRef (core, refi->addr);
			if (flag) {
				r_list_append (ret, r_str_new (flag));
			}
		}
	}
	r_list_free (xrefs);
	return ret;
}

R_API RList *r_sign_fcn_refs(RAnal *a, RAnalFunction *fcn) {
	RListIter *iter = NULL;
	RAnalRef *refi = NULL;

	r_return_val_if_fail (a && fcn, NULL);

	RCore *core = a->coreb.core;

	if (!core) {
		return NULL;
	}

	RList *ret = r_list_newf ((RListFree) free);
	RList *refs = r_anal_function_get_refs (fcn);
	r_list_foreach (refs, iter, refi) {
		if (refi->type == R_ANAL_REF_TYPE_CODE || refi->type == R_ANAL_REF_TYPE_CALL) {
			const char *flag = getRealRef (core, refi->addr);
			if (flag) {
				r_list_append (ret, r_str_new (flag));
			}
		}
	}
	r_list_free (refs);
	return ret;
}

static RList *zign_types_to_list(RAnal *a, const char *types) {
	RList *ret = r_list_newf ((RListFree)free);
	if (!ret) {
		return NULL;
	}

	unsigned int i = 0, prev = 0, len = strlen (types);
	bool quoted = false;
	char *token = NULL;
	for (i = 0; i <= len; i++) {
		if (types[i] == '"') {
			quoted = !quoted;
		} else if ((types[i] == ',' && !quoted) || types[i] == '\0') {
			token = r_str_ndup (types + prev, i - prev);
			if (token) {
				prev = i + 1;
				r_list_append (ret, token);
				token = NULL;
			}
		}
	}

	return ret;
}

static RList *do_reflike_sig(const char *token) {
	RList *list = NULL;
	char *scratch = r_str_new (token);
	int cnt = r_str_split (scratch, ',');
	if (cnt > 0 && (list = r_list_newf ((RListFree)free))) {
		int i;
		for (i = 0; i < cnt; i++) {
			r_list_append (list, r_str_new (r_str_word_get0 (scratch, i)));
		}
	}
	free (scratch);
	return list;
}

#define DBL_VAL_FAIL(x,y) \
	if (x) { \
		eprintf ("Warning: Skipping signature with multiple %c signatures (%s)\n", y, k); \
		success = false; \
		goto out; \
	}
R_API bool r_sign_deserialize(RAnal *a, RSignItem *it, const char *k, const char *v) {
	r_return_val_if_fail (a && it && k && v, false);

	bool success = true;
	char *k2 = r_str_new (k);
	char *v2 = r_str_new (v);
	if (!k2 || !v2) {
		success = false;
		goto out;
	}

	// Deserialize key: zign|space|name
	int n = r_str_split (k2, '|');
	if (n != 3) {
		eprintf ("Warning: Skipping signature with invalid key (%s)\n", k);
		success = false;
		goto out;
	}
	if (strcmp (r_str_word_get0 (k2, 0), "zign")) {
		eprintf ("Warning: Skipping signature with invalid value (%s)\n", k);
		success = false;
		goto out;
	}

	it->space = r_spaces_add (&a->zign_spaces, r_str_word_get0 (k2, 1));
	it->name = r_str_new (r_str_word_get0 (k2, 2));

	// remove newline at end
	strtok (v2, "\n");
	// Deserialize value: |k:v|k:v|k:v|...
	n = r_str_split (v2, '|');
	const char *token = NULL;
	int w, size;
	for (w = 0; w < n; w++) {
		const char *word = r_str_word_get0 (v2, w);
		if (!word) {
			break;
		}
		if (!*word) {
			continue;
		}
		token = word + 2;
		if (!strcmp (word, "*")) {
			continue;
		}
		if (strlen (word) < 3 || word[1] != ':') {
			eprintf ("Warning: Skipping signature with corrupted serialization (%s:%s)\n", k, word);
			success = false;
			goto out;
		}
		RSignType st = (RSignType)*word;
		switch (st) {
		case R_SIGN_ANAL:
			eprintf ("Unsupported\n");
			break;
		case R_SIGN_NAME:
			DBL_VAL_FAIL (it->realname, R_SIGN_NAME);
			it->realname = strdup (token);
			break;
		case R_SIGN_COMMENT:
			DBL_VAL_FAIL (it->comment, R_SIGN_COMMENT);
			it->comment = strdup (token);
			break;
		case R_SIGN_GRAPH:
			DBL_VAL_FAIL (it->graph, R_SIGN_GRAPH);
			if (strlen (token) == 2 * sizeof (RSignGraph)) {
				it->graph = R_NEW0 (RSignGraph);
				if (it->graph) {
					r_hex_str2bin (token, (ut8 *)it->graph);
				}
			}
			break;
		case R_SIGN_OFFSET:
			DBL_VAL_FAIL ((it->addr != UT64_MAX), R_SIGN_OFFSET);
			it->addr = atoll (token);
			break;
		case R_SIGN_REFS:
			DBL_VAL_FAIL (it->refs, R_SIGN_REFS);
			if (!(it->refs = do_reflike_sig (token))) {
				success = false;
				goto out;
			}
			break;
		case R_SIGN_XREFS:
			DBL_VAL_FAIL (it->xrefs, R_SIGN_XREFS);
			if (!(it->xrefs = do_reflike_sig (token))) {
				success = false;
				goto out;
			}
			break;
		case R_SIGN_VARS:
			DBL_VAL_FAIL (it->vars, R_SIGN_VARS);
			if (!(it->vars = do_reflike_sig (token))) {
				success = false;
				goto out;
			}
			break;
		case R_SIGN_TYPES:
			DBL_VAL_FAIL (it->types, R_SIGN_TYPES);
			it->types = zign_types_to_list (a, token);
			break;
		case R_SIGN_BBHASH:
			DBL_VAL_FAIL (it->hash, R_SIGN_BBHASH);
			if (token[0] != 0) {
				it->hash = R_NEW0 (RSignHash);
				if (it->hash) {
					it->hash->bbhash = r_str_new (token);
				}
			}
			break;
		case R_SIGN_BYTES:
			// following two errors are not due to double entries
			if (!it->bytes) {
				eprintf ("Warning: Skipping signature with no bytes size (%s)\n", k);
				success = false;
				goto out;
			}
			if (strlen (token) != 2 * it->bytes->size) {
				eprintf ("Warning: Skipping signature with invalid size (%s)\n", k);
				success = false;
				goto out;
			}
			DBL_VAL_FAIL (it->bytes->bytes, R_SIGN_BYTES);
			it->bytes->bytes = malloc (it->bytes->size);
			if (it->bytes->bytes) {
				r_hex_str2bin (token, it->bytes->bytes);
			}
			break;
		case R_SIGN_BYTES_MASK:
			// following two errors are not due to double entries
			if (!it->bytes) {
				eprintf ("Warning: Skipping signature with no mask size (%s)\n", k);
				success = false;
				goto out;
			}
			if (strlen (token) != 2 * it->bytes->size) {
				eprintf ("Warning: Skipping signature invalid mask size (%s)\n", k);
				success = false;
				goto out;
			}
			DBL_VAL_FAIL (it->bytes->mask, R_SIGN_BYTES);
			it->bytes->mask = malloc (it->bytes->size);
			if (!it->bytes->mask) {
				goto out;
			}
			r_hex_str2bin (token, it->bytes->mask);
			break;
		case R_SIGN_BYTES_SIZE:
			// allocate
			size = atoi (token);
			if (size > 0) {
				DBL_VAL_FAIL (it->bytes, R_SIGN_BYTES_SIZE);
				it->bytes = R_NEW0 (RSignBytes);
				if (!it->bytes) {
					goto out;
				}
				it->bytes->size = size;
			}
			break;
		default:
			eprintf ("Unsupported (%s)\n", word);
			break;
		}
	}
out:
	free (k2);
	free (v2);
	return success;
}
#undef DBL_VAL_FAIL

static void serializeKey(RAnal *a, const RSpace *space, const char* name, char *k) {
	snprintf (k, R_SIGN_KEY_MAXSZ, "zign|%s|%s", space? space->name: "*", name);
}

static void serializeKeySpaceStr(RAnal *a, const char *space, const char* name, char *k) {
	snprintf (k, R_SIGN_KEY_MAXSZ, "zign|%s|%s", space, name);
}

static void serialize(RAnal *a, RSignItem *it, char *k, char *v) {
	RListIter *iter = NULL;
	char *hexbytes = NULL, *hexmask = NULL, *hexgraph = NULL;
	char *refs = NULL, *xrefs = NULL, *ref = NULL, *var, *vars = NULL;
	char *type, *types = NULL;
	int i = 0, len = 0;
	RSignBytes *bytes = it->bytes;
	RSignGraph *graph = it->graph;
	RSignHash *hash = it->hash;

	if (k) {
		serializeKey (a, it->space, it->name, k);
	}
	if (v) {
		if (bytes) {
			len = bytes->size * 2 + 1;
			hexbytes = calloc (1, len);
			hexmask = calloc (1, len);
			if (!hexbytes || !hexmask) {
				free (hexbytes);
				free (hexmask);
				return;
			}
			if (!bytes->bytes) {
				bytes->bytes = malloc ((bytes->size + 1) * 3);
			}
			r_hex_bin2str (bytes->bytes, bytes->size, hexbytes);
			if (!bytes->mask) {
				bytes->mask = malloc ((bytes->size + 1) * 3);
			}
			r_hex_bin2str (bytes->mask, bytes->size, hexmask);
		}
		if (graph) {
			hexgraph = calloc (1, sizeof (RSignGraph) * 2 + 1);
			if (hexgraph) {
				r_hex_bin2str ((ut8 *) graph, sizeof (RSignGraph), hexgraph);
			}
		}
		i = 0;
		r_list_foreach (it->refs, iter, ref) {
			if (i > 0) {
				refs = r_str_appendch (refs, ',');
			}
			refs = r_str_append (refs, ref);
			i++;
		}
		i = 0;
		r_list_foreach (it->xrefs, iter, ref) {
			if (i > 0) {
				xrefs = r_str_appendch (xrefs, ',');
			}
			xrefs = r_str_append (xrefs, ref);
			i++;
		}
		i = 0;
		r_list_foreach (it->vars, iter, var) {
			if (i > 0) {
				vars = r_str_appendch (vars, ',');
			}
			vars = r_str_append (vars, var);
			i++;
		}
		i = 0;
		r_list_foreach (it->types, iter, type) {
			if (i > 0) {
				types = r_str_appendch (types, ',');
			}
			types = r_str_append (types, type);
			i++;
		}
		RStrBuf *sb = r_strbuf_new ("");
		if (bytes) {
			// TODO: do not hardcoded s,b,m here, use RSignType enum
			r_strbuf_appendf (sb, "|s:%d|b:%s|m:%s", bytes->size, hexbytes, hexmask);
		}
		if (it->addr != UT64_MAX) {
			r_strbuf_appendf (sb, "|%c:%"PFMT64d, R_SIGN_OFFSET, it->addr);
		}
		if (graph) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_GRAPH, hexgraph);
		}
		if (refs) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_REFS, refs);
		}
		if (xrefs) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_XREFS, xrefs);
		}
		if (vars) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_VARS, vars);
		}
		if (types) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_TYPES, types);
		}
		if (it->comment) {
			// b64 encoded
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_COMMENT, it->comment);
		}
		if (it->realname) {
			// b64 encoded
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_NAME, it->realname);
		}
		if (hash && hash->bbhash) {
			r_strbuf_appendf (sb, "|%c:%s", R_SIGN_BBHASH, hash->bbhash);
		}
		if (r_strbuf_length (sb) >= R_SIGN_VAL_MAXSZ) {
			eprintf ("Signature limit reached for 0x%08"PFMT64x" (%s)\n", it->addr, it->name);
		}
		char *res = r_strbuf_drain (sb);
		if (res) {
			strncpy (v, res, R_SIGN_VAL_MAXSZ);
			free (res);
		}

		free (hexbytes);
		free (hexmask);
		free (hexgraph);
		free (refs);
		free (vars);
		free (xrefs);
		free (types);
	}
}

static RList *deserialize_sign_space(RAnal *a, RSpace *space) {
	r_return_val_if_fail (a && space, NULL);

	char k[R_SIGN_KEY_MAXSZ];
	serializeKey (a, space, "", k);
	SdbList *zigns = sdb_foreach_match (a->sdb_zigns, k, false);

	SdbListIter *iter;
	SdbKv *kv;
	RList *ret = r_list_newf ((RListFree)r_sign_item_free);
	if (!ret) {
		goto beach;
	}
	ls_foreach (zigns, iter, kv) {
		RSignItem *it = r_sign_item_new ();
		if (!it) {
			goto beach;
		}
		if (r_sign_deserialize (a, it, kv->base.key, kv->base.value)) {
			r_list_append (ret, it);
		} else {
			r_sign_item_free (it);
		}
	}

	ls_free (zigns);
	return ret;

beach:
	ls_free (zigns);
	r_list_free (ret);
	return NULL;
}

static void mergeItem(RSignItem *dst, RSignItem *src) {
	RListIter *iter = NULL;
	char *ref, *var, *type;

	if (src->bytes) {
		r_sign_bytes_free (dst->bytes);
		dst->bytes = R_NEW0 (RSignBytes);
		if (!dst->bytes) {
			return;
		}
		dst->space = src->space;
		dst->bytes->size = src->bytes->size;
		dst->bytes->bytes = malloc (src->bytes->size);
		if (!dst->bytes->bytes) {
			r_sign_bytes_free (dst->bytes);
			return;
		}
		memcpy (dst->bytes->bytes, src->bytes->bytes, src->bytes->size);
		dst->bytes->mask = malloc (src->bytes->size);
		if (!dst->bytes->mask) {
			r_sign_bytes_free (dst->bytes);
			return;
		}
		memcpy (dst->bytes->mask, src->bytes->mask, src->bytes->size);
	}

	if (src->graph) {
		free (dst->graph);
		dst->graph = R_NEW0 (RSignGraph);
		if (!dst->graph) {
			return;
		}
		*dst->graph = *src->graph;
	}

	if (src->comment) {
		dst->comment = strdup (src->comment);
	}

	if (src->realname) {
		dst->realname = strdup (src->realname);
	}

	if (src->addr != UT64_MAX) {
		dst->addr = src->addr;
	}

	if (src->refs) {
		r_list_free (dst->refs);

		dst->refs = r_list_newf ((RListFree)free);
		r_list_foreach (src->refs, iter, ref) {
			r_list_append (dst->refs, r_str_new (ref));
		}
	}

	if (src->vars) {
		r_list_free (dst->vars);

		dst->vars = r_list_newf ((RListFree)free);
		r_list_foreach (src->vars, iter, var) {
			r_list_append (dst->vars, r_str_new (var));
		}
	}

	if (src->types) {
		r_list_free (dst->types);

		dst->types = r_list_newf ((RListFree)free);
		r_list_foreach (src->types, iter, type) {
			r_list_append (dst->types, r_str_new (type));
		}
	}

	if (src->hash) {
		if (!dst->hash) {
			dst->hash = R_NEW0 (RSignHash);
			if (!dst->hash) {
				return;
			}
		}
		if (src->hash->bbhash) {
			dst->hash->bbhash = strdup (src->hash->bbhash);
		}
	}
}

R_API RSignItem *r_sign_get_item(RAnal *a, const char *name) {
	char k[R_SIGN_KEY_MAXSZ];
	serializeKey (a, r_spaces_current (&a->zign_spaces), name, k);

	const char *v = sdb_const_get (a->sdb_zigns, k, 0);
	if (!v) {
		return NULL;
	}
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return NULL;
	}
	if (!r_sign_deserialize (a, it, k, v)) {
		r_sign_item_free (it);
		return NULL;
	}
	return it;
}

R_API bool r_sign_add_item(RAnal *a, RSignItem *it) {
	char key[R_SIGN_KEY_MAXSZ], val[R_SIGN_VAL_MAXSZ];
	const char *curval = NULL;
	bool retval = true;
	RSignItem *curit = r_sign_item_new ();
	if (!curit) {
		return false;
	}

	serialize (a, it, key, val);
	curval = sdb_const_get (a->sdb_zigns, key, 0);
	if (curval) {
		if (!r_sign_deserialize (a, curit, key, curval)) {
			eprintf ("error: cannot deserialize zign\n");
			retval = false;
			goto out;
		}
		mergeItem (curit, it);
		serialize (a, curit, key, val);
	}
	sdb_set (a->sdb_zigns, key, val, 0);

out:
	r_sign_item_free (curit);

	return retval;
}

static bool addHash(RAnal *a, const char *name, int type, const char *val) {
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		r_sign_item_free (it);
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		r_sign_item_free (it);
		return false;
	}
	it->hash = R_NEW0 (RSignHash);
	if (!it->hash) {
		r_sign_item_free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);

	bool retval = false;
	switch (type) {
	case R_SIGN_BBHASH:
		it->hash->bbhash = strdup (val);
		retval = r_sign_add_item (a, it);
		r_sign_item_free (it);
		break;
	}

	return retval;
}

static bool addBBHash(RAnal *a, RAnalFunction *fcn, const char *name) {
	bool retval = false;
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		goto beach;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		goto beach;
	}
	it->space = r_spaces_current (&a->zign_spaces);

	if (r_sign_addto_item (a, it, fcn, R_SIGN_BBHASH)) {
		retval = r_sign_add_item (a, it);
	}
beach:
	r_sign_item_free (it);
	return retval;
}

static bool addBytes(RAnal *a, const char *name, ut64 size, const ut8 *bytes, const ut8 *mask) {
	bool retval = true;

	if (r_mem_is_zero (mask, size)) {
		eprintf ("error: zero mask\n");
		return false;
	}

	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}

	it->name = r_str_new (name);
	if (!it->name) {
		free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->bytes = R_NEW0 (RSignBytes);
	if (!it->bytes) {
		goto fail;
	}
	it->bytes->size = size;
	it->bytes->bytes = malloc (size);
	if (!it->bytes->bytes) {
		goto fail;
	}
	memcpy (it->bytes->bytes, bytes, size);
	it->bytes->mask = malloc (size);
	if (!it->bytes->mask) {
		goto fail;
	}
	memcpy (it->bytes->mask, mask, size);
	retval = r_sign_add_item (a, it);
	r_sign_item_free (it);
	return retval;
fail:
	if (it) {
		free (it->name);
		r_sign_bytes_free (it->bytes);
	}
	free (it);
	return false;
}

R_API bool r_sign_add_hash(RAnal *a, const char *name, int type, const char *val, int len) {
	r_return_val_if_fail (a && name && type && val && len > 0, false);
	if (type != R_SIGN_BBHASH) {
		eprintf ("error: hash type unknown");
		return false;
	}
	int digestsize = r_hash_size (R_ZIGN_HASH) * 2;
	if (len != digestsize) {
		eprintf ("error: invalid hash size: %d (%s digest size is %d)\n", len, ZIGN_HASH, digestsize);
		return false;
	}
	return addHash (a, name, type, val);
}

R_API bool r_sign_add_bb_hash(RAnal *a, RAnalFunction *fcn, const char *name) {
	r_return_val_if_fail (a && fcn && name, false);
	return addBBHash (a, fcn, name);
}

R_API bool r_sign_add_bytes(RAnal *a, const char *name, ut64 size, const ut8 *bytes, const ut8 *mask) {
	r_return_val_if_fail (a && name && size > 0 && bytes && mask, false);
	return addBytes (a, name, size, bytes, mask);
}

R_API bool r_sign_add_anal(RAnal *a, const char *name, ut64 size, const ut8 *bytes, ut64 at) {
	bool retval = false;
	r_return_val_if_fail (a && name && size > 0 && bytes, false);
	ut8 *mask = r_anal_mask (a, size, bytes, at);
	if (mask) {
		retval = addBytes (a, name, size, bytes, mask);
		free (mask);
	}
	return retval;
}

static RSignGraph *r_sign_fcn_graph(RAnalFunction *fcn) {
	r_return_val_if_fail (fcn, false);
	RSignGraph *graph = R_NEW0 (RSignGraph);
	if (graph) {
		graph->cc = r_anal_function_complexity (fcn),
		graph->nbbs = r_list_length (fcn->bbs);
		graph->edges = r_anal_function_count_edges (fcn, &graph->ebbs);
		graph->bbsum = r_anal_function_realsize (fcn);
	}
	return graph;
}

static int bb_sort_by_addr(const void *x, const void *y) {
	RAnalBlock *a = (RAnalBlock *)x;
	RAnalBlock *b = (RAnalBlock *)y;
	if (a->addr > b->addr) {
		return 1;
	}
	if (a->addr < b->addr) {
		return -1;
	}
	return 0;
}

static RSignBytes *r_sign_fcn_bytes(RAnal *a, RAnalFunction *fcn) {
	r_return_val_if_fail (a && fcn && fcn->bbs && fcn->bbs->head, false);

	// get size
	RCore *core = a->coreb.core;
	int maxsz = a->coreb.cfggeti (core, "zign.maxsz");
	r_list_sort (fcn->bbs, &bb_sort_by_addr);
	ut64 ea = fcn->addr;
	RAnalBlock *bb = (RAnalBlock *)fcn->bbs->tail->data;
	int size = R_MIN (bb->addr + bb->size - ea, maxsz);

	// alloc space for signature
	RSignBytes *sig = R_NEW0 (RSignBytes);
	if (!sig) {
		goto bytes_failed;
	}
	if (!(sig->bytes = malloc (size))) {
		goto bytes_failed;
	}
	if (!(sig->mask = malloc (size))) {
		goto bytes_failed;
	}
	memset (sig->mask, 0, size);
	sig->size = size;

	// fill in bytes
	if (!a->iob.read_at (a->iob.io, ea, sig->bytes, size)) {
		eprintf ("error: failed to read at 0x%08" PFMT64x "\n", ea);
		goto bytes_failed;
	}

	ut8 *tmpmask = NULL;
	RListIter *iter;
	r_list_foreach (fcn->bbs, iter, bb) {
		if (bb->addr >= ea) {
			size_t delta = bb->addr - ea;
			size_t rsize = bb->size;

			// bounds check
			if (delta > size) {
				break;
			}
			if (size - delta < rsize) {
				rsize = size - delta;
			}

			// get mask for block
			if (!(tmpmask = r_anal_mask (a, rsize, sig->bytes + delta, ea))) {
				goto bytes_failed;
			}
			if (rsize > 0) {
				memcpy (sig->mask + delta, tmpmask, rsize);
			}
			free (tmpmask);
		}
	}

	return sig;
bytes_failed:
	r_sign_bytes_free (sig);
	return NULL;
}

static RSignHash *r_sign_fcn_bbhash(RAnal *a, RAnalFunction *fcn) {
	r_return_val_if_fail (a && fcn, NULL);
	RSignHash *hash = R_NEW0 (RSignHash);
	if (!hash) {
		return NULL;
	}

	char *digest_hex = r_sign_calc_bbhash (a, fcn);
	if (!digest_hex) {
		free (hash);
		return NULL;
	}
	hash->bbhash = digest_hex;
	return hash;
}

R_API bool r_sign_addto_item(RAnal *a, RSignItem *it, RAnalFunction *fcn, RSignType type) {
	r_return_val_if_fail (a && it && fcn, false);
	switch (type) {
	case R_SIGN_GRAPH:
		return !it->graph && (it->graph = r_sign_fcn_graph (fcn));
	case R_SIGN_BYTES:
		return !it->bytes && (it->bytes = r_sign_fcn_bytes (a, fcn));
	case R_SIGN_XREFS:
		return !it->xrefs && (it->xrefs = r_sign_fcn_xrefs (a, fcn));
	case R_SIGN_REFS:
		return !it->refs && (it->refs = r_sign_fcn_refs (a, fcn));
	case R_SIGN_VARS:
		return !it->vars && (it->vars = r_sign_fcn_vars (a, fcn));
	case R_SIGN_TYPES:
		return !it->types && (it->types = r_sign_fcn_types (a, fcn));
	case R_SIGN_BBHASH:
		return !it->hash && (it->hash = r_sign_fcn_bbhash (a, fcn));
	case R_SIGN_OFFSET:
		it->addr = fcn->addr;
		return true;
	case R_SIGN_NAME:
		if (!it->realname && it->name) {
			if (strcmp (it->name, fcn->name)) {
				it->realname = strdup (fcn->name);
			}
			return true;
		}
		break;
	default:
		eprintf ("Error: %s Can not handle type %c\n", __FUNCTION__, type);
	}

	return false;
}

R_API bool r_sign_add_graph(RAnal *a, const char *name, RSignGraph graph) {
	r_return_val_if_fail (a && !R_STR_ISEMPTY (name), false);
	bool retval = true;
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->graph = R_NEW0 (RSignGraph);
	if (!it->graph) {
		free (it->name);
		free (it);
		return false;
	}
	*it->graph = graph;
	retval = r_sign_add_item (a, it);
	r_sign_item_free (it);

	return retval;
}

R_API bool r_sign_add_comment(RAnal *a, const char *name, const char *comment) {
	r_return_val_if_fail (a && name && comment, false);

	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	it->space = r_spaces_current (&a->zign_spaces);
	it->comment = strdup (comment);
	bool retval = r_sign_add_item (a, it);
	r_sign_item_free (it);
	return retval;
}

R_API bool r_sign_add_name(RAnal *a, const char *name, const char *realname) {
	r_return_val_if_fail (a && name && realname, false);
	RSignItem *it = r_sign_item_new ();
	if (it) {
		it->name = r_str_new (name);
		it->realname = strdup (realname);
		it->space = r_spaces_current (&a->zign_spaces);
		bool retval = r_sign_add_item (a, it);
		r_sign_item_free (it);
		return retval;
	}
	return false;
}

R_API bool r_sign_add_addr(RAnal *a, const char *name, ut64 addr) {
	r_return_val_if_fail (a && name && addr != UT64_MAX, false);

	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return NULL;
	}
	it->name = r_str_new (name);
	it->space = r_spaces_current (&a->zign_spaces);
	it->addr = addr;

	bool retval = r_sign_add_item (a, it);

	r_sign_item_free (it);

	return retval;
}

R_API bool r_sign_add_vars(RAnal *a, const char *name, RList *vars) {
	r_return_val_if_fail (a && name && vars, false);

	RListIter *iter;
	char *var;

	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		r_sign_item_free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->vars = r_list_newf ((RListFree)free);
	r_list_foreach (vars, iter, var) {
		r_list_append (it->vars, strdup (var));
	}
	bool retval = r_sign_add_item (a, it);
	r_sign_item_free (it);

	return retval;
}

R_API bool r_sign_add_types(RAnal *a, const char *name, RList *types) {
	r_return_val_if_fail (a && name && types, false);

	RListIter *iter;
	char *type;

	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		r_sign_item_free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->types = r_list_newf ((RListFree) free);
	r_list_foreach (types, iter, type) {
		r_list_append (it->types, strdup (type));
	}
	bool retval = r_sign_add_item (a, it);
	r_sign_item_free (it);

	return retval;
}

R_API bool r_sign_add_refs(RAnal *a, const char *name, RList *refs) {
	r_return_val_if_fail (a && name && refs, false);

	char *ref;
	RListIter *iter;
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->refs = r_list_newf ((RListFree) free);
	r_list_foreach (refs, iter, ref) {
		r_list_append (it->refs, strdup (ref));
	}
	bool retval = r_sign_add_item (a, it);
	r_sign_item_free (it);

	return retval;
}

R_API bool r_sign_add_xrefs(RAnal *a, const char *name, RList *xrefs) {
	r_return_val_if_fail (a && name && xrefs, false);

	RListIter *iter = NULL;
	char *ref = NULL;
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	it->name = r_str_new (name);
	if (!it->name) {
		free (it);
		return false;
	}
	it->space = r_spaces_current (&a->zign_spaces);
	it->xrefs = r_list_newf ((RListFree) free);
	r_list_foreach (xrefs, iter, ref) {
		r_list_append (it->xrefs, strdup (ref));
	}
	bool retval = r_sign_add_item (a, it);
	r_sign_item_free (it);

	return retval;
}

struct ctxDeleteCB {
	RAnal *anal;
	char buf[R_SIGN_KEY_MAXSZ];
};

static bool deleteBySpaceCB(void *user, const char *k, const char *v) {
	struct ctxDeleteCB *ctx = (struct ctxDeleteCB *) user;
	if (!strncmp (k, ctx->buf, strlen (ctx->buf))) {
		sdb_remove (ctx->anal->sdb_zigns, k, 0);
	}
	return true;
}

R_API bool r_sign_delete(RAnal *a, const char *name) {
	struct ctxDeleteCB ctx = {0};
	char k[R_SIGN_KEY_MAXSZ];

	if (!a || !name) {
		return false;
	}
	// Remove all zigns
	if (*name == '*') {
		if (!r_spaces_current (&a->zign_spaces)) {
			sdb_reset (a->sdb_zigns);
			return true;
		}
		ctx.anal = a;
		serializeKey (a, r_spaces_current (&a->zign_spaces), "", ctx.buf);
		sdb_foreach (a->sdb_zigns, deleteBySpaceCB, &ctx);
		return true;
	}
	// Remove specific zign
	serializeKey (a, r_spaces_current (&a->zign_spaces), name, k);
	return sdb_remove (a->sdb_zigns, k, 0);
}

static ut8 * build_combined_bytes(RSignBytes *bsig) {
	r_return_val_if_fail (bsig && bsig->bytes && bsig->mask, NULL);
	ut8 *buf = (ut8 *)malloc (bsig->size);
	if (buf) {
		size_t i;
		for (i = 0; i < bsig->size; i++) {
			buf[i] = bsig->bytes[i] & bsig->mask[i];
		}
	}
	return buf;
}

static double cmp_bytesig_to_buff(RSignBytes *sig, ut8 *buf, int len) {
	r_return_val_if_fail (sig && buf && len >= 0, (double)-1.0);
	ut8 *sigbuf = build_combined_bytes (sig);
	double sim = -1.0;
	if (sigbuf) {
		r_diff_buffers_distance (NULL, sigbuf, sig->size, buf, len, NULL, &sim);
		free (sigbuf);
	}
	return sim;
}

static double matchBytes(RSignItem *a, RSignItem *b) {
	double result = 0.0;

	if (!a->bytes || !b->bytes) {
		return result;
	}

	size_t min_size = R_MIN ((size_t)a->bytes->size, (size_t)b->bytes->size);
	if (!min_size) {
		return result;
	}

	ut8 *combined_mask = NULL;
	if (a->bytes->mask || b->bytes->mask) {
		combined_mask = (ut8*)malloc (min_size);
		if (!combined_mask) {
			return result;
		}
		memcpy (combined_mask, a->bytes->mask, min_size);
		if (b->bytes->mask) {
			int i;
			for (i = 0; i != min_size; i++) {
				combined_mask[i] &= b->bytes->mask[i];
			}
		}
	}

	if ((combined_mask && !r_mem_cmp_mask (a->bytes->bytes, b->bytes->bytes, combined_mask, min_size)) ||
		(!combined_mask && !memcmp (a->bytes->bytes, b->bytes->bytes, min_size))) {
		result = (double)min_size / (double)R_MAX (a->bytes->size, b->bytes->size);
	}

	free (combined_mask);

	return result;
}

#define SIMILARITY(a, b) \
	((a) == (b)? 1.0: (R_MAX ((a), (b)) == 0.0? 0.0: (double)R_MIN ((a), (b)) / (double)R_MAX ((a), (b))))

static double matchGraph(RSignItem *a, RSignItem *b) {
	if (!a->graph || !b->graph) {
		return 0.0;
	}

	double total = 0.0;

	total += SIMILARITY (a->graph->cc, b->graph->cc);
	total += SIMILARITY (a->graph->nbbs, b->graph->nbbs);
	total += SIMILARITY (a->graph->ebbs, b->graph->ebbs);
	total += SIMILARITY (a->graph->edges, b->graph->edges);
	total += SIMILARITY (a->graph->bbsum, b->graph->bbsum);

	return total / 5.0;
}

static int score_cmpr(const void *a, const void *b) {
	double sa = ((RSignCloseMatch *)a)->score;
	double sb = ((RSignCloseMatch *)b)->score;

	if (sa < sb) {
		return 1;
	}
	if (sa > sb) {
		return -1;
	}
	return 0;
}

typedef struct {
	RSignItem *test;
	RList *output;
	size_t count;
	double score_threshold;
	ut8 *bytes_combined;

	// greatest lower bound. Thanks lattice theory for helping name variables
	double infimum;
} ClosestMatchData;

static bool closest_match_update(ClosestMatchData *data, RSignItem *it) {
	// quantify how close the signature matches
	int div = 0;
	double score = 0.0;
	double gscore = -1.0;
	if (it->graph && data->test->graph) {
		gscore = matchGraph (it, data->test);
		score += gscore;
		div++;
	}
	double bscore = -1.0;
	bool list_full = (r_list_length (data->output) == data->count);

	// value to beat to enter the list
	double pivot = data->score_threshold;
	if (list_full) {
		pivot = R_MAX (pivot, data->infimum);
	}

	if (it->bytes && data->bytes_combined) {
		int sizea = it->bytes->size;
		int sizeb = data->test->bytes->size;
		if (pivot > 0.0) {
			// bytes distance is slow. To avoid it, we can do quick maths to
			// see if the highest possible score would be good enough to change
			// results
			double maxscore = R_MIN (sizea, sizeb) / R_MAX (sizea, sizeb);
			if (div > 0) {
				maxscore = (maxscore + score) / div;
			}
			if (maxscore < pivot) {
				r_sign_item_free (it);
				return true;
			}
		}

		// get true byte score
		bscore = cmp_bytesig_to_buff (it->bytes, data->bytes_combined, sizeb);
		score += bscore;
		div++;
	}
	if (div == 0) {
		r_sign_item_free (it);
		return true;
	}
	score /= div;

	// score is too low, don't bother doing any more work
	if (score < pivot) {
		r_sign_item_free (it);
		return true;
	}

	// add new element
	RSignCloseMatch *row = R_NEW (RSignCloseMatch);
	if (!row) {
		r_sign_item_free (it);
		return false;
	}
	row->score = score;
	row->gscore = gscore;
	row->bscore = bscore;
	row->item = it;
	r_list_add_sorted (data->output, (void *)row, &score_cmpr);

	if (list_full) {
		// remove smallest element
		r_sign_close_match_free (r_list_pop (data->output));

		// get new infimum
		row = r_list_get_top (data->output);
		data->infimum = row->score;
	}
	return true;
}

static bool closest_match_callback(void *a, const char *name, const char *value) {
	ClosestMatchData *data = (ClosestMatchData *)a;

	// get signature in usable format
	RSignItem *it = r_sign_item_new ();
	if (!it) {
		return false;
	}
	if (!r_sign_deserialize (a, it, name, value)) {
		r_sign_item_free (it);
		return false;
	}

	return closest_match_update (data, it);
}

R_API void r_sign_close_match_free(RSignCloseMatch *match) {
	if (match) {
		r_sign_item_free (match->item);
		free (match);
	}
}

R_API RList *r_sign_find_closest_sig(RAnal *a, RSignItem *it, int count, double score_threshold) {
	r_return_val_if_fail (a && it && count > 0 && score_threshold >= 0 && score_threshold <= 1, NULL);

	// need at least one acceptable signature type
	r_return_val_if_fail (it->bytes || it->graph, NULL);

	ClosestMatchData data;
	RList *output = r_list_newf ((RListFree)r_sign_close_match_free);
	if (!output) {
		return NULL;
	}

	data.output = output;
	data.count = count;
	data.score_threshold = score_threshold;
	data.infimum = 0.0;
	data.test = it;
	if (it->bytes) {
		data.bytes_combined = build_combined_bytes (it->bytes);
	} else {
		data.bytes_combined = NULL;
	}

	// TODO: handle sign spaces
	if (!sdb_foreach (a->sdb_zigns, &closest_match_callback, (void *)&data)) {
		r_list_free (output);
		output = NULL;
	}

	free (data.bytes_combined);
	return output;
}

R_API RList *r_sign_find_closest_fcn(RAnal *a, RSignItem *it, int count, double score_threshold) {
	r_return_val_if_fail (a && it && count > 0 && score_threshold >= 0 && score_threshold <= 1, NULL);
	r_return_val_if_fail (it->bytes || it->graph, NULL);

	RList *output = r_list_newf ((RListFree)r_sign_close_match_free);
	if (!output) {
		return NULL;
	}

	ClosestMatchData data;
	data.output = output;
	data.count = count;
	data.score_threshold = score_threshold;
	data.infimum = 0.0;
	data.test = it;
	if (it->bytes) {
		data.bytes_combined = build_combined_bytes (it->bytes);
	} else {
		data.bytes_combined = NULL;
	}

	RAnalFunction *fcn;
	RListIter *iter;
	r_list_foreach (a->fcns, iter, fcn) {
		// turn function into signature item
		RSignItem *fsig = r_sign_item_new ();
		if (!fsig) {
			r_list_free (output);
			return NULL;
		}
		if (data.bytes_combined) {
			r_sign_addto_item (a, fsig, fcn, R_SIGN_BYTES);
		}
		if (it->graph) {
			r_sign_addto_item (a, fsig, fcn, R_SIGN_GRAPH);
		}
		r_sign_addto_item (a, fsig, fcn, R_SIGN_OFFSET);
		fsig->name = r_str_new (fcn->name);

		// maybe add signature item to output list
		closest_match_update (&data, fsig);
	}
	free (data.bytes_combined);
	return output;
}

R_API bool r_sign_diff(RAnal *a, RSignOptions *options, const char *other_space_name) {
	r_return_val_if_fail (a && other_space_name, false);

	RSpace *current_space = r_spaces_current (&a->zign_spaces);
	if (!current_space) {
		return false;
	}
	RSpace *other_space = r_spaces_get (&a->zign_spaces, other_space_name);
	if (!other_space) {
		return false;
	}

	RList *la = deserialize_sign_space (a, current_space);
	if (!la) {
		return false;
	}
	RList *lb = deserialize_sign_space (a, other_space);
	if (!lb) {
		r_list_free (la);
		return false;
	}

	eprintf ("Diff %d %d\n", (int)ls_length (la), (int)ls_length (lb));

	RListIter *itr;
	RListIter *itr2;
	RSignItem *si;
	RSignItem *si2;

	// do the sign diff here
	r_list_foreach (la, itr, si) {
		if (strstr (si->name, "imp.")) {
			continue;
		}
		r_list_foreach (lb, itr2, si2) {
			if (strstr (si2->name, "imp.")) {
				continue;
			}
			double bytesScore = matchBytes (si, si2);
			double graphScore = matchGraph (si, si2);
			bool bytesMatch = bytesScore >= (options ? options->bytes_diff_threshold : SIGN_DIFF_MATCH_BYTES_THRESHOLD);
			bool graphMatch = graphScore >= (options ? options->graph_diff_threshold : SIGN_DIFF_MATCH_GRAPH_THRESHOLD);

			if (bytesMatch) {
				a->cb_printf ("0x%08" PFMT64x " 0x%08"PFMT64x " %02.5lf B %s\n", si->addr, si2->addr, bytesScore, si->name);
			}

			if (graphMatch) {
				a->cb_printf ("0x%08" PFMT64x " 0x%08"PFMT64x" %02.5lf G %s\n", si->addr, si2->addr, graphScore, si->name);
			}
		}
	}

	r_list_free (la);
	r_list_free (lb);
	return true;
}

R_API bool r_sign_diff_by_name(RAnal *a, RSignOptions *options, const char *other_space_name, bool not_matching) {
	r_return_val_if_fail (a && other_space_name, false);

	RSpace *current_space = r_spaces_current (&a->zign_spaces);
	if (!current_space) {
		return false;
	}
	RSpace *other_space = r_spaces_get (&a->zign_spaces, other_space_name);
	if (!other_space) {
		return false;
	}

	RList *la = deserialize_sign_space (a, current_space);
	if (!la) {
		return false;
	}
	RList *lb = deserialize_sign_space (a, other_space);
	if (!lb) {
		return false;
	}

	eprintf ("Diff by name %d %d (%s)\n", (int)ls_length (la), (int)ls_length (lb), not_matching? "not matching" : "matching");

	RListIter *itr;
	RListIter *itr2;
	RSignItem *si;
	RSignItem *si2;
	size_t current_space_name_len = strlen (current_space->name);
	size_t other_space_name_len = strlen (other_space->name);

	r_list_foreach (la, itr, si) {
		if (strstr (si->name, "imp.")) {
			continue;
		}
		r_list_foreach (lb, itr2, si2) {
			if (strcmp (si->name + current_space_name_len + 1, si2->name + other_space_name_len + 1)) {
				continue;
			}
			// TODO: add config variable for threshold
			double bytesScore = matchBytes (si, si2);
			double graphScore = matchGraph (si, si2);
			bool bytesMatch = bytesScore >= (options ? options->bytes_diff_threshold : SIGN_DIFF_MATCH_BYTES_THRESHOLD);
			bool graphMatch = graphScore >= (options ? options->graph_diff_threshold : SIGN_DIFF_MATCH_GRAPH_THRESHOLD);
			if ((bytesMatch && !not_matching) || (!bytesMatch && not_matching)) {
				a->cb_printf ("0x%08"PFMT64x" 0x%08"PFMT64x" %02.5f B %s\n", si->addr, si2->addr, bytesScore, si->name);
			}
			if ((graphMatch && !not_matching) || (!graphMatch && not_matching)) {
				a->cb_printf ("0x%08"PFMT64x" 0x%08"PFMT64x" %02.5f G %s\n", si->addr, si2->addr, graphScore, si->name);
			}
		}
	}

	r_list_free (la);
	r_list_free (lb);

	return true;
}

struct ctxListCB {
	RAnal *anal;
	int idx;
	int format;
	PJ *pj;
};

struct ctxGetListCB {
	RAnal *anal;
	RList *list;
};

static void listBytes(RAnal *a, RSignItem *it, PJ *pj, int format) {
	RSignBytes *bytes = it->bytes;

	if (!bytes->bytes) {
		return;
	}

	int masked = 0, i = 0;
	for (i = 0; i < bytes->size; i++) {
		masked += bytes->mask[i] == 0xff;
	}

	char * strbytes = r_hex_bin2strdup (bytes->bytes, bytes->size);
	if (!strbytes) {
		return;
	}
	char * strmask = r_hex_bin2strdup (bytes->mask, bytes->size);
	if (!strmask) {
		free (strbytes);
		return;
	}

	if (format == '*') {
		if (masked == bytes->size) {
			a->cb_printf ("za %s b %s\n", it->name, strbytes);
		} else {
			a->cb_printf ("za %s b %s:%s\n", it->name, strbytes, strmask);
		}
	} else if (format == 'q') {
		a->cb_printf (" b(%d/%d)", masked, bytes->size);
	} else if (format == 'j') {
		pj_ks (pj, "bytes", strbytes);
		pj_ks (pj, "mask", strmask);
	} else {
		a->cb_printf ("  bytes: %s\n", strbytes);
		a->cb_printf ("  mask: %s\n", strmask);
	}

	free (strbytes);
	free (strmask);
}

static void listGraph(RAnal *a, RSignItem *it, PJ *pj, int format) {
	RSignGraph *graph = it->graph;

	if (format == 'q') {
		a->cb_printf (" g(cc=%d,nb=%d,e=%d,eb=%d,h=%d)",
			graph->cc, graph->nbbs, graph->edges, graph->ebbs, graph->bbsum);
	} else if (format == '*') {
		a->cb_printf ("za %s g cc=%d nbbs=%d edges=%d ebbs=%d bbsum=%d\n",
			it->name, graph->cc, graph->nbbs, graph->edges, graph->ebbs, graph->bbsum);
	} else if (format == 'j') {
		pj_ko (pj, "graph");
		pj_kN (pj, "cc", graph->cc);
		pj_kN (pj, "nbbs", graph->nbbs);
		pj_kN (pj, "edges", graph->edges);
		pj_kN (pj, "ebbs", graph->ebbs);
		pj_kN (pj, "bbsum", graph->bbsum);
		pj_end (pj);
	} else {
		a->cb_printf ("  graph: cc=%d nbbs=%d edges=%d ebbs=%d bbsum=%d\n",
			graph->cc, graph->nbbs, graph->edges, graph->ebbs, graph->bbsum);
	}
}

static void listComment(RAnal *a, RSignItem *it, PJ *pj, int format) {
	if (it->comment) {
		if (format == 'q') {
			//	a->cb_printf (" addr(0x%08"PFMT64x")", it->addr);
			a->cb_printf ("\n ; %s\n", it->comment);
		} else if (format == '*') {
			a->cb_printf ("%s\n", it->comment); // comment injection via CCu..
		} else if (format == 'j') {
			pj_ks (pj, "comments", it->comment);
		} else {
			a->cb_printf ("  comment: 0x%08" PFMT64x "\n", it->addr);
		}
	}
}

static void listRealname(RAnal *a, RSignItem *it, PJ *pj, int format) {
	if (it->realname) {
		if (format == 'q') {
			//	a->cb_printf (" addr(0x%08"PFMT64x")", it->addr);
		} else if (format == '*') {
			a->cb_printf ("za %s n %s\n", it->name, it->realname);
			a->cb_printf ("afn %s @ 0x%08"PFMT64x"\n", it->realname, it->addr);
		} else if (format == 'j') {
			pj_ks (pj, "realname", it->realname);
		} else {
			a->cb_printf ("  realname: %s\n", it->realname);
		}
	}
}

static void listOffset(RAnal *a, RSignItem *it, PJ *pj, int format) {
	if (format == 'q') {
		//	a->cb_printf (" addr(0x%08"PFMT64x")", it->addr);
	} else if (format == '*') {
		a->cb_printf ("za %s o 0x%08"PFMT64x"\n", it->name, it->addr);
	} else if (format == 'j') {
		pj_kN (pj, "addr", it->addr);
	} else {
		a->cb_printf ("  addr: 0x%08"PFMT64x"\n", it->addr);
	}
}

static void listVars(RAnal *a, RSignItem *it, PJ *pj, int format) {
	RListIter *iter = NULL;
	char *var = NULL;
	int i = 0;

	if (format == '*') {
		a->cb_printf ("za %s v ", it->name);
	} else if (format == 'q') {
		a->cb_printf (" vars(%d)", r_list_length (it->vars));
		return;
	} else if (format == 'j') {
		pj_ka (pj, "vars");
	} else {
		a->cb_printf ("  vars: ");
	}

	r_list_foreach (it->vars, iter, var) {
		if (i > 0) {
			if (format == '*') {
				a->cb_printf (" ");
			} else if (format != 'j') {
				a->cb_printf (", ");
			}
		}
		if (format == 'j') {
			pj_s (pj, var);
		} else {
			a->cb_printf ("%s", var);
		}
		i++;
	}

	if (format == 'j') {
		pj_end (pj);
	} else {
		a->cb_printf ("\n");
	}
}

static void print_list_type_header(RAnal *a, RSignItem *it, PJ *pj, int format) {
	if (format == '*') {
		a->cb_printf ("za %s t ", it->name);
	} else if (format == 'q') {
		a->cb_printf (" types(%d)", r_list_length (it->types));
		return;
	} else if (format == 'j') {
		pj_ka (pj, "types");
	} else {
		a->cb_printf ("  types: ");
	}
}

static void print_function_args_json(RAnal *a, PJ *pj, char *arg_type) {
	char *arg_name = strchr (arg_type, ',');

	if (arg_name == NULL) {
		return;
	}

	*arg_name = '\0';
	++arg_name;

	size_t len_arg_name = strlen (arg_name);
	arg_name[len_arg_name - 1] = '\0';

	pj_o (pj);
	pj_ks (pj, "name", arg_name);
	pj_ks (pj, "type", arg_type + 1);
	pj_end (pj);
}

static void print_type_json(RAnal *a, char *type, PJ *pj, size_t pos) {
	if (pos == 0) {
		return;
	}

	char *str_type = strchr (type, '=');

	if (str_type == NULL) {
		return;
	}

	*str_type = '\0';
	++str_type;

	print_function_args_json (a, pj, str_type);
}

static void print_list_separator(RAnal *a, RSignItem *it, PJ *pj, int format, int pos) {
	if (pos == 0 || format == 'j') {
		return;
	}
	if (format == '*') {
		a->cb_printf (" ");
	} else {
		a->cb_printf (", ");
	}
}

static void print_list_type_body(RAnal *a, RSignItem *it, PJ *pj, int format) {
	int i = 0;
	char *type = NULL;
	RListIter *iter = NULL;

	r_list_foreach (it->types, iter, type) {
		print_list_separator (a, it, pj, format, i);

		if (format == 'j') {
			char *t = strdup (type);
			print_type_json (a, t, pj, i);
			free (t);
		} else {
			a->cb_printf ("%s", type);
		}
		i++;
	}
}

static void listTypes(RAnal *a, RSignItem *it, PJ *pj, int format) {
	print_list_type_header (a, it, pj, format);
	print_list_type_body (a, it, pj, format);

	if (format == 'j') {
		pj_end (pj);
	} else {
		a->cb_printf ("\n");
	}
}

static void listXRefs(RAnal *a, RSignItem *it, PJ *pj, int format) {
	RListIter *iter = NULL;
	char *ref = NULL;
	int i = 0;

	if (format == '*') {
		a->cb_printf ("za %s x ", it->name);
	} else if (format == 'q') {
		a->cb_printf (" xrefs(%d)", r_list_length (it->xrefs));
		return;
	} else if (format == 'j') {
		pj_ka (pj, "xrefs");
	} else {
		if (it->xrefs && !r_list_empty (it->xrefs)) {
			a->cb_printf ("  xrefs: ");
		}
	}

	r_list_foreach (it->xrefs, iter, ref) {
		if (i > 0) {
			if (format == '*') {
				a->cb_printf (" ");
			} else if (format != 'j') {
				a->cb_printf (", ");
			}
		}
		if (format == 'j') {
			pj_s (pj, ref);
		} else {
			a->cb_printf ("%s", ref);
		}
		i++;
	}

	if (format == 'j') {
		pj_end (pj);
	} else {
		a->cb_printf ("\n");
	}
}

static void listRefs(RAnal *a, RSignItem *it, PJ *pj, int format) {
	RListIter *iter = NULL;
	char *ref = NULL;
	int i = 0;

	if (format == '*') {
		a->cb_printf ("za %s r ", it->name);
	} else if (format == 'q') {
		a->cb_printf (" refs(%d)", r_list_length (it->refs));
		return;
	} else if (format == 'j') {
		pj_ka (pj, "refs");
	} else {
		if (it->refs && !r_list_empty (it->refs)) {
			a->cb_printf ("  refs: ");
		}
	}

	r_list_foreach (it->refs, iter, ref) {
		if (i > 0) {
			if (format == '*') {
				a->cb_printf (" ");
			} else if (format != 'j') {
				a->cb_printf (", ");
			}
		}
		if (format == 'j') {
			pj_s (pj, ref);
		} else {
			a->cb_printf ("%s", ref);
		}
		i++;
	}

	if (format == 'j') {
		pj_end (pj);
	} else {
		a->cb_printf ("\n");
	}
}

static void listHash(RAnal *a, RSignItem *it, PJ *pj, int format) {
	if (!it->hash) {
		return;
	}
	switch (format) {
	case 'q':
		if (it->hash->bbhash) {
			a->cb_printf (" h(%08x)", r_str_hash (it->hash->bbhash));
		}
		break;
	case '*':
		if (it->hash->bbhash) {
			a->cb_printf ("za %s h %s\n", it->name, it->hash->bbhash);
		}
		break;
	case 'j':
		pj_ko (pj, "hash");
		if (it->hash->bbhash) {
			pj_ks (pj, "bbhash", it->hash->bbhash);
		}
		pj_end (pj);
		break;
	default:
		if (it->hash->bbhash) {
			a->cb_printf ("  bbhash: %s\n", it->hash->bbhash);
		}
		break;
	}
}

static bool listCB(void *user, const char *k, const char *v) {
	struct ctxListCB *ctx = (struct ctxListCB *)user;
	RSignItem *it = r_sign_item_new ();
	RAnal *a = ctx->anal;

	if (!r_sign_deserialize (a, it, k, v)) {
		eprintf ("error: cannot deserialize zign\n");
		goto out;
	}

	RSpace *cur = r_spaces_current (&a->zign_spaces);
	if (cur != it->space && cur) {
		goto out;
	}

	// Start item
	if (ctx->format == 'j') {
		pj_o (ctx->pj);
	}

	// Zignspace and name (except for radare format)
	if (ctx->format == '*') {
		if (it->space) {
			a->cb_printf ("zs %s\n", it->space->name);
		} else {
			a->cb_printf ("zs *\n");
		}
	} else if (ctx->format == 'q') {
		a->cb_printf ("0x%08" PFMT64x " ", it->addr);
		const char *pad = r_str_pad (' ', 30 - strlen (it->name));
		a->cb_printf ("%s:%s", it->name, pad);
	} else if (ctx->format == 'j') {
		if (it->space) {
			pj_ks (ctx->pj, "zignspace", it->space->name);
		}
		pj_ks (ctx->pj, "name", it->name);
	} else {
		if (!r_spaces_current (&a->zign_spaces) && it->space) {
			a->cb_printf ("(%s) ", it->space->name);
		}
		a->cb_printf ("%s:\n", it->name);
	}

	// Bytes pattern
	if (it->bytes) {
		listBytes (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ks (ctx->pj, "bytes", "");
	}

	// Graph metrics
	if (it->graph) {
		listGraph (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ko (ctx->pj, "graph");
		pj_end (ctx->pj);
	}

	// Offset
	if (it->addr != UT64_MAX) {
		listOffset (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_kN (ctx->pj, "addr", -1);
	}
	// Name
	if (it->realname) {
		listRealname (a, it, ctx->pj, ctx->format);
	}
	if (it->comment) {
		listComment (a, it, ctx->pj, ctx->format);
	}
	// References
	if (it->refs) {
		listRefs (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ka (ctx->pj, "refs");
		pj_end (ctx->pj);
	}
	// XReferences
	if (it->xrefs) {
		listXRefs (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ka (ctx->pj, "xrefs");
		pj_end (ctx->pj);
	}
	// Vars
	if (it->vars) {
		listVars (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ka (ctx->pj, "vars");
		pj_end (ctx->pj);
	}
	if (it->types) {
		listTypes (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ka (ctx->pj, "types");
		pj_end (ctx->pj);
	}
	// Hash
	if (it->hash) {
		listHash (a, it, ctx->pj, ctx->format);
	} else if (ctx->format == 'j') {
		pj_ko (ctx->pj, "hash");
		pj_end (ctx->pj);
	}

	// End item
	if (ctx->format == 'j') {
		pj_end (ctx->pj);
	}
	if (ctx->format == 'q') {
		a->cb_printf ("\n");
	}

	ctx->idx++;

out:
	r_sign_item_free (it);

	return true;
}

R_API void r_sign_list(RAnal *a, int format) {
	r_return_if_fail (a);
	PJ *pj = NULL;

	if (format == 'j') {
		pj = a->coreb.pjWithEncoding (a->coreb.core);
		pj_a (pj);
	}

	struct ctxListCB ctx = { a, 0, format, pj };
	sdb_foreach (a->sdb_zigns, listCB, &ctx);

	if (format == 'j') {
		pj_end (pj);
		a->cb_printf ("%s\n", pj_string (pj));
		pj_free (pj);
	}
}

static bool listGetCB(void *user, const char *key, const char *val) {
	struct ctxGetListCB *ctx = user;
	RSignItem *item = r_sign_item_new ();
	if (!item) {
		return false;
	}
	if (!r_sign_deserialize (ctx->anal, item, key, val)) {
		r_sign_item_free (item);
		return false;
	}
	r_list_append (ctx->list, item);
	return true;
}

R_API RList *r_sign_get_list(RAnal *a) {
	r_return_val_if_fail (a, NULL);
	struct ctxGetListCB ctx = { a, r_list_newf ((RListFree)r_sign_item_free) };
	sdb_foreach (a->sdb_zigns, listGetCB, &ctx);
	return ctx.list;
}

static int cmpaddr(const void *_a, const void *_b) {
	const RAnalBlock *a = _a, *b = _b;
	return (a->addr - b->addr);
}

R_API char *r_sign_calc_bbhash(RAnal *a, RAnalFunction *fcn) {
	RListIter *iter = NULL;
	RAnalBlock *bbi = NULL;
	char *digest_hex = NULL;
	RHash *ctx = r_hash_new (true, R_ZIGN_HASH);
	if (!ctx) {
		goto beach;
	}
	r_list_sort (fcn->bbs, &cmpaddr);
	r_hash_do_begin (ctx, R_ZIGN_HASH);
	r_list_foreach (fcn->bbs, iter, bbi) {
		ut8 *buf = malloc (bbi->size);
		if (!buf) {
			goto beach;
		}
		if (!a->iob.read_at (a->iob.io, bbi->addr, buf, bbi->size)) {
			goto beach;
		}
		if (!r_hash_do_sha256 (ctx, buf, bbi->size)) {
			goto beach;
		}
		free (buf);
	}
	r_hash_do_end (ctx, R_ZIGN_HASH);

	digest_hex = r_hex_bin2strdup (ctx->digest, r_hash_size (R_ZIGN_HASH));
beach:
	free (ctx);
	return digest_hex;
}

struct ctxCountForCB {
	RAnal *anal;
	const RSpace *space;
	int count;
};

static bool countForCB(void *user, const char *k, const char *v) {
	struct ctxCountForCB *ctx = (struct ctxCountForCB *) user;
	RSignItem *it = r_sign_item_new ();

	if (r_sign_deserialize (ctx->anal, it, k, v)) {
		if (it->space == ctx->space) {
			ctx->count++;
		}
	} else {
		eprintf ("error: cannot deserialize zign\n");
	}
	r_sign_item_free (it);

	return true;
}

R_API int r_sign_space_count_for(RAnal *a, const RSpace *space) {
	struct ctxCountForCB ctx = { a, space, 0 };
	r_return_val_if_fail (a, 0);
	sdb_foreach (a->sdb_zigns, countForCB, &ctx);
	return ctx.count;
}

struct ctxUnsetForCB {
	RAnal *anal;
	const RSpace *space;
};

static bool unsetForCB(void *user, const char *k, const char *v) {
	struct ctxUnsetForCB *ctx = (struct ctxUnsetForCB *) user;
	char nk[R_SIGN_KEY_MAXSZ], nv[R_SIGN_VAL_MAXSZ];
	RSignItem *it = r_sign_item_new ();
	Sdb *db = ctx->anal->sdb_zigns;
	if (r_sign_deserialize (ctx->anal, it, k, v)) {
		if (it->space && it->space == ctx->space) {
			it->space = NULL;
			serialize (ctx->anal, it, nk, nv);
			sdb_remove (db, k, 0);
			sdb_set (db, nk, nv, 0);
		}
	} else {
		eprintf ("error: cannot deserialize zign\n");
	}
	r_sign_item_free (it);
	return true;
}

R_API void r_sign_space_unset_for(RAnal *a, const RSpace *space) {
	r_return_if_fail (a);
	struct ctxUnsetForCB ctx = { a, space };
	sdb_foreach (a->sdb_zigns, unsetForCB, &ctx);
}

struct ctxRenameForCB {
	RAnal *anal;
	char oprefix[R_SIGN_KEY_MAXSZ];
	char nprefix[R_SIGN_KEY_MAXSZ];
};

static bool renameForCB(void *user, const char *k, const char *v) {
	struct ctxRenameForCB *ctx = (struct ctxRenameForCB *) user;
	char nk[R_SIGN_KEY_MAXSZ], nv[R_SIGN_VAL_MAXSZ];
	const char *zigname = NULL;
	Sdb *db = ctx->anal->sdb_zigns;

	if (!strncmp (k, ctx->oprefix, strlen (ctx->oprefix))) {
		zigname = k + strlen (ctx->oprefix);
		snprintf (nk, R_SIGN_KEY_MAXSZ, "%s%s", ctx->nprefix, zigname);
		snprintf (nv, R_SIGN_VAL_MAXSZ, "%s", v);
		sdb_remove (db, k, 0);
		sdb_set (db, nk, nv, 0);
	}
	return true;
}

R_API void r_sign_space_rename_for(RAnal *a, const RSpace *space, const char *oname, const char *nname) {
	r_return_if_fail (a && space && oname && nname);
	struct ctxRenameForCB ctx = {.anal = a};
	serializeKeySpaceStr (a, oname, "", ctx.oprefix);
	serializeKeySpaceStr (a, nname, "", ctx.nprefix);
	sdb_foreach (a->sdb_zigns, renameForCB, &ctx);
}

struct ctxForeachCB {
	RAnal *anal;
	RSignForeachCallback cb;
	bool freeit;
	void *user;
};

static bool foreachCB(void *user, const char *k, const char *v) {
	struct ctxForeachCB *ctx = (struct ctxForeachCB *) user;
	RSignItem *it = r_sign_item_new ();
	RAnal *a = ctx->anal;

	if (r_sign_deserialize (a, it, k, v)) {
		RSpace *cur = r_spaces_current (&a->zign_spaces);
		if (ctx->cb && cur == it->space) {
			ctx->cb (it, ctx->user);
		}
	} else {
		eprintf ("error: cannot deserialize zign\n");
	}
	if (ctx->freeit) {
		r_sign_item_free (it);
	}
	return true;
}

static bool r_sign_foreach_nofree(RAnal *a, RSignForeachCallback cb, void *user) {
	r_return_val_if_fail (a && cb, false);
	struct ctxForeachCB ctx = { a, cb, false, user };
	return sdb_foreach (a->sdb_zigns, foreachCB, &ctx);
}

R_API bool r_sign_foreach(RAnal *a, RSignForeachCallback cb, void *user) {
	r_return_val_if_fail (a && cb, false);
	struct ctxForeachCB ctx = { a, cb, true, user };
	return sdb_foreach (a->sdb_zigns, foreachCB, &ctx);
}

R_API RSignSearch *r_sign_search_new(void) {
	RSignSearch *ret = R_NEW0 (RSignSearch);
	if (ret) {
		ret->search = r_search_new (R_SEARCH_KEYWORD);
		ret->items = r_list_newf ((RListFree) r_sign_item_free);
	}
	return ret;
}

R_API void r_sign_search_free(RSignSearch *ss) {
	if (!ss) {
		return;
	}
	r_search_free (ss->search);
	r_list_free (ss->items);
	free (ss);
}

static int searchHitCB(RSearchKeyword *kw, void *user, ut64 addr) {
	RSignSearch *ss = (RSignSearch *) user;
	return ss->cb? ss->cb ((RSignItem *) kw->data, kw, addr, ss->user): 1;
}

struct ctxAddSearchKwCB {
	RSignSearch *ss;
	int minsz;
};

static int addSearchKwCB(RSignItem *it, void *user) {
	struct ctxAddSearchKwCB *ctx = (struct ctxAddSearchKwCB *) user;
	RSignSearch *ss = ctx->ss;
	RSignBytes *bytes = it->bytes;

	if (!bytes) {
		eprintf ("Cannot find bytes for this signature: %s\n", it->name);
		return 1;
	}

	if (ctx->minsz && bytes->size < ctx->minsz) {
		return 1;
	}
	r_list_append (ss->items, it);
	// TODO(nibble): change arg data in r_search_keyword_new to void*
	RSearchKeyword *kw = r_search_keyword_new (bytes->bytes, bytes->size, bytes->mask, bytes->size, (const char *)it);
	r_search_kw_add (ss->search, kw);
	return 1;
}

R_API void r_sign_search_init(RAnal *a, RSignSearch *ss, int minsz, RSignSearchCallback cb, void *user) {
	struct ctxAddSearchKwCB ctx = { ss, minsz };
	r_return_if_fail (a && ss && cb);
	ss->cb = cb;
	ss->user = user;
	r_list_purge (ss->items);
	r_search_reset (ss->search, R_SEARCH_KEYWORD);
	r_sign_foreach_nofree (a, addSearchKwCB, &ctx);
	r_search_begin (ss->search);
	r_search_set_callback (ss->search, searchHitCB, ss);
}

R_API int r_sign_search_update(RAnal *a, RSignSearch *ss, ut64 *at, const ut8 *buf, int len) {
	r_return_val_if_fail (a && ss && buf && len > 0, 0);
	return r_search_update (ss->search, *at, buf, len);
}

// allow ~10% of margin error
static int matchCount(int a, int b) {
	int c = a - b;
	int m = a / 10;
	return R_ABS (c) < m;
}

static bool fcnMetricsCmp(RSignItem *it, RAnalFunction *fcn) {
	RSignGraph *graph = it->graph;
	int ebbs = -1;

	if (graph->cc != -1 && graph->cc != r_anal_function_complexity (fcn)) {
		return false;
	}
	if (graph->nbbs != -1 && graph->nbbs != r_list_length (fcn->bbs)) {
		return false;
	}
	if (graph->edges != -1 && graph->edges != r_anal_function_count_edges (fcn, &ebbs)) {
		return false;
	}
	if (graph->ebbs != -1 && graph->ebbs != ebbs) {
		return false;
	}
	if (graph->bbsum > 0 && matchCount (graph->bbsum, r_anal_function_linear_size (fcn))) {
		return false;
	}
	return true;
}

static bool graph_match(RSignItem *it, RSignSearchMetrics *sm) {
	RSignGraph *graph = it->graph;

	if (!graph) {
		return false;
	}

	if (graph->cc < sm->mincc) {
		return false;
	}

	if (!fcnMetricsCmp (it, sm->fcn)) {
		return false;
	}

	return true;
}

static bool addr_match(RSignItem *it, RSignSearchMetrics *sm) {
	if (it->addr != sm->fcn->addr || it->addr == UT64_MAX) {
		return false;
	}
	return true;
}

static bool hash_match(RSignItem *it, char **digest_hex, RSignSearchMetrics *sm) {
	RSignHash *hash = it->hash;
	if (!hash || !hash->bbhash || hash->bbhash[0] == 0) {
		return false;
	}

	if (!*digest_hex) {
		*digest_hex = r_sign_calc_bbhash (sm->anal, sm->fcn);
	}
	if (strcmp (hash->bbhash, *digest_hex)) {
		return false;
	}
	return true;
}

static bool str_list_equals(RList *la, RList *lb) {
	r_return_val_if_fail (la && lb, false);
	size_t len = r_list_length (la);
	if (len != r_list_length (lb)) {
		return false;
	}
	size_t i;
	for (i = 0; i < len; i++) {
		const char *a = r_list_get_n (la, i);
		const char *b = r_list_get_n (lb, i);
		if (strcmp (a, b)) {
			return false;
		}
	}
	return true;
}

static bool vars_match(RSignItem *it, RList **vars, RSignSearchMetrics *sm) {
	r_return_val_if_fail (vars && sm, false);
	if (!it->vars) {
		return false;
	}

	if (!*vars) {
		*vars = r_sign_fcn_vars (sm->anal, sm->fcn);
		if (!*vars) {
			return false;
		}
	}

	if (str_list_equals (*vars, it->vars)) {
		return true;
	}
	return false;
}

static bool refs_match(RSignItem *it, RList **refs, RSignSearchMetrics *sm) {
	r_return_val_if_fail (refs && sm, false);
	if (!it->refs) {
		return false;
	}

	if (!*refs) {
		*refs = r_sign_fcn_refs (sm->anal, sm->fcn);
		if (!*refs) {
			return false;
		}
	}

	if (str_list_equals (*refs, it->refs)) {
		return true;
	}
	return false;
}

static bool types_match(RSignItem *it, RList **types, RSignSearchMetrics *sm) {
	r_return_val_if_fail (types && sm, false);
	if (!it->types) {
		return false;
	}

	if (!*types) {
		*types = r_sign_fcn_types (sm->anal, sm->fcn);
		if (!*types) {
			return false;
		}
	}

	if (str_list_equals (*types, it->types)) {
		return true;
	}
	return false;
}

struct metric_ctx {
	int matched;
	RSignSearchMetrics *sm;
	RList *refs;
	RList *types;
	RList *vars;
	char *digest_hex;
};

static int match_metrics(RSignItem *it, void *user) {
	struct metric_ctx *ctx = (struct metric_ctx *)user;
	RSignSearchMetrics *sm = ctx->sm;
	RSignType type;
	int count = 0;
	int i = 0;
	while ((type = sm->types[i++])) {
		bool found = false;
		switch (type) {
		case R_SIGN_GRAPH:
			found = graph_match (it, sm);
			break;
		case R_SIGN_OFFSET:
			found = addr_match (it, sm);
			break;
		case R_SIGN_BBHASH:
			found = hash_match (it, &ctx->digest_hex, sm);
			break;
		case R_SIGN_REFS:
			found = refs_match (it, &ctx->refs, sm);
			break;
		case R_SIGN_TYPES:
			found = vars_match (it, &ctx->vars, sm);
			break;
		case R_SIGN_VARS:
			found = types_match (it, &ctx->types, sm);
			break;
		default:
			eprintf ("Invalid type: %c\n", type);
		}
		if (found) {
			sm->cb (it, sm->fcn, type, (count > 1), sm->user);
			count++;
		}
	}
	ctx->matched += count;
	return count? 0: 1;
}

R_API int r_sign_fcn_match_metrics(RSignSearchMetrics *sm) {
	r_return_val_if_fail (sm && sm->mincc >= 0 && sm->anal && sm->fcn, false);
	struct metric_ctx ctx = { 0, sm, NULL, NULL, NULL, NULL };
	r_sign_foreach (sm->anal, match_metrics, (void *)&ctx);
	r_list_free (ctx.refs);
	r_list_free (ctx.types);
	r_list_free (ctx.vars);
	free (ctx.digest_hex);
	return ctx.matched;
}

R_API RSignItem *r_sign_item_new(void) {
	RSignItem *ret = R_NEW0 (RSignItem);
	if (ret) {
		ret->addr = UT64_MAX;
		ret->space = NULL;
	}
	return ret;
}

R_API void r_sign_item_free(RSignItem *item) {
	if (!item) {
		return;
	}
	free (item->name);
	r_sign_bytes_free (item->bytes);
	if (item->hash) {
		free (item->hash->bbhash);
		free (item->hash);
	}
	r_sign_graph_free (item->graph);
	free (item->comment);
	free (item->realname);
	r_list_free (item->refs);
	r_list_free (item->vars);
	r_list_free (item->xrefs);
	r_list_free (item->types);
	free (item);
}

R_API void r_sign_graph_free(RSignGraph *graph) {
	free (graph);
}

R_API void r_sign_bytes_free(RSignBytes *bytes) {
	if (bytes) {
		free (bytes->bytes);
		free (bytes->mask);
		free (bytes);
	}
}

static bool loadCB(void *user, const char *k, const char *v) {
	RAnal *a = (RAnal *) user;
	char nk[R_SIGN_KEY_MAXSZ], nv[R_SIGN_VAL_MAXSZ];
	RSignItem *it = r_sign_item_new ();
	if (it && r_sign_deserialize (a, it, k, v)) {
		serialize (a, it, nk, nv);
		sdb_set (a->sdb_zigns, nk, nv, 0);
	} else {
		eprintf ("error: cannot deserialize zign\n");
	}
	r_sign_item_free (it);
	return true;
}

R_API char *r_sign_path(RAnal *a, const char *file) {
	char *abs = r_file_abspath (file);
	if (abs) {
		if (r_file_is_regular (abs)) {
			return abs;
		}
		free (abs);
	}

	if (a->zign_path) {
		char *path = r_str_newf ("%s%s%s", a->zign_path, R_SYS_DIR, file);
		abs = r_file_abspath (path);
		free (path);
		if (r_file_is_regular (abs)) {
			return abs;
		}
		free (abs);
	} else {
		char *home = r_str_home (R2_HOME_ZIGNS);
		abs = r_str_newf ("%s%s%s", home, R_SYS_DIR, file);
		free (home);
		if (r_file_is_regular (abs)) {
			return abs;
		}
		free (abs);
	}

	abs = r_str_newf (R_JOIN_3_PATHS ("%s", R2_ZIGNS, "%s"), r_sys_prefix (NULL), file);
	if (r_file_is_regular (abs)) {
		return abs;
	}
	free (abs);

	return NULL;
}

R_API bool r_sign_load(RAnal *a, const char *file) {
	if (!a || !file) {
		return false;
	}
	char *path = r_sign_path (a, file);
	if (!r_file_exists (path)) {
		eprintf ("error: file %s does not exist\n", file);
		free (path);
		return false;
	}
	Sdb *db = sdb_new (NULL, path, 0);
	if (!db) {
		free (path);
		return false;
	}
	sdb_foreach (db, loadCB, a);
	sdb_close (db);
	sdb_free (db);
	free (path);
	return true;
}

R_API bool r_sign_load_gz(RAnal *a, const char *filename) {
	ut8 *buf = NULL;
	int size = 0;
	char *tmpfile = NULL;
	bool retval = true;

	char *path = r_sign_path (a, filename);
	if (!r_file_exists (path)) {
		eprintf ("error: file %s does not exist\n", filename);
		retval = false;
		goto out;
	}

	if (!(buf = r_file_gzslurp (path, &size, 0))) {
		eprintf ("error: cannot decompress file\n");
		retval = false;
		goto out;
	}

	if (!(tmpfile = r_file_temp ("r2zign"))) {
		eprintf ("error: cannot create temp file\n");
		retval = false;
		goto out;
	}

	if (!r_file_dump (tmpfile, buf, size, 0)) {
		eprintf ("error: cannot dump file\n");
		retval = false;
		goto out;
	}

	if (!r_sign_load (a, tmpfile)) {
		eprintf ("error: cannot load file\n");
		retval = false;
		goto out;
	}

	if (!r_file_rm (tmpfile)) {
		eprintf ("error: cannot delete temp file\n");
		retval = false;
		goto out;
	}

out:
	free (buf);
	free (tmpfile);
	free (path);

	return retval;
}

R_API bool r_sign_save(RAnal *a, const char *file) {
	r_return_val_if_fail (a && file, false);

	if (sdb_isempty (a->sdb_zigns)) {
		eprintf ("WARNING: no zignatures to save\n");
		return false;
	}

	Sdb *db = sdb_new (NULL, file, 0);
	if (!db) {
		return false;
	}
	sdb_merge (db, a->sdb_zigns);
	bool retval = sdb_sync (db);
	sdb_close (db);
	sdb_free (db);

	return retval;
}

R_API RSignOptions *r_sign_options_new(const char *bytes_thresh, const char *graph_thresh) {
	RSignOptions *options = R_NEW0 (RSignOptions);
	if (!options) {
		return NULL;
	}

	options->bytes_diff_threshold = r_num_get_float (NULL, bytes_thresh);
	options->graph_diff_threshold = r_num_get_float (NULL, graph_thresh);

	if (options->bytes_diff_threshold > 1.0) {
		options->bytes_diff_threshold = 1.0;
	}
	if (options->bytes_diff_threshold < 0) {
		options->bytes_diff_threshold = 0.0;
	}
	if (options->graph_diff_threshold > 1.0) {
		options->graph_diff_threshold = 1.0;
	}
	if (options->graph_diff_threshold < 0) {
		options->graph_diff_threshold = 0.0;
	}

	return options;
}

R_API void r_sign_options_free(RSignOptions *options) {
	R_FREE (options);
}