blob: add uci<->blob conversion library code

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

3 files changed, 255 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a72012..e846ceb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,9 +13,10 @@ CONFIGURE_FILE( ${CMAKE_SOURCE_DIR}/uci_config.h.in ${CMAKE_SOURCE_DIR}/uci_conf
 
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 
-SET(LIB_SOURCES libuci.c file.c util.c delta.c parse.c)
+SET(LIB_SOURCES libuci.c file.c util.c delta.c parse.c blob.c)
 
 ADD_LIBRARY(uci SHARED ${LIB_SOURCES})
+TARGET_LINK_LIBRARIES(uci ubox)
 SET_TARGET_PROPERTIES(uci PROPERTIES OUTPUT_NAME uci)
 
 ADD_EXECUTABLE(cli cli.c)
@@ -29,7 +30,7 @@ TARGET_LINK_LIBRARIES(ucimap-example uci ucimap)
 
 ADD_SUBDIRECTORY(lua)
 
-INSTALL(FILES uci.h uci_config.h ucimap.h
+INSTALL(FILES uci.h uci_config.h uci_blob.h ucimap.h
 	DESTINATION include
 )
 
diff --git a/blob.c b/blob.c
new file mode 100644
index 0000000..6fdaa47
--- /dev/null
+++ b/blob.c
@@ -0,0 +1,211 @@
+/*
+ * blob.c - uci <-> blobmsg conversion layer
+ * Copyright (C) 2012-2013 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <libubox/blobmsg.h>
+#include "uci.h"
+#include "uci_blob.h"
+
+static bool
+uci_attr_to_blob(struct blob_buf *b, const char *str,
+		 const char *name, enum blobmsg_type type)
+{
+	char *err;
+	int intval;
+
+	switch (type) {
+	case BLOBMSG_TYPE_STRING:
+		blobmsg_add_string(b, name, str);
+		break;
+	case BLOBMSG_TYPE_BOOL:
+		if (!strcmp(str, "true") || !strcmp(str, "1"))
+			intval = 1;
+		else if (!strcmp(str, "false") || !strcmp(str, "0"))
+			intval = 0;
+		else
+			return false;
+
+		blobmsg_add_u8(b, name, intval);
+		break;
+	case BLOBMSG_TYPE_INT32:
+		intval = strtol(str, &err, 0);
+		if (*err)
+			return false;
+
+		blobmsg_add_u32(b, name, intval);
+		break;
+	default:
+		return false;
+	}
+	return true;
+}
+
+static void
+uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
+		  enum blobmsg_type type)
+{
+	struct uci_element *e;
+	char *str, *next, *word;
+
+	if (o->type == UCI_TYPE_LIST) {
+		uci_foreach_element(&o->v.list, e) {
+			uci_attr_to_blob(b, e->name, NULL, type);
+		}
+		return;
+	}
+
+	str = strdup(o->v.string);
+	next = str;
+
+	while ((word = strsep(&next, " \t")) != NULL) {
+		if (!*word)
+			continue;
+
+		uci_attr_to_blob(b, word, NULL, type);
+	}
+
+	free(str);
+}
+
+static int
+__uci_to_blob(struct blob_buf *b, struct uci_section *s,
+	      const struct uci_blob_param_list *p)
+{
+	const struct blobmsg_policy *attr = NULL;
+	struct uci_element *e;
+	struct uci_option *o;
+	void *array;
+	int i, ret = 0;
+
+	uci_foreach_element(&s->options, e) {
+		for (i = 0; i < p->n_params; i++) {
+			attr = &p->params[i];
+			if (!strcmp(attr->name, e->name))
+				break;
+		}
+
+		if (i == p->n_params)
+			continue;
+
+		o = uci_to_option(e);
+
+		if (attr->type == BLOBMSG_TYPE_ARRAY) {
+			if (!p->info)
+				continue;
+
+			array = blobmsg_open_array(b, attr->name);
+			uci_array_to_blob(b, o, p->info[i].type);
+			blobmsg_close_array(b, array);
+			ret++;
+			continue;
+		}
+
+		if (o->type == UCI_TYPE_LIST)
+			continue;
+
+		ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
+	}
+
+	return ret;
+}
+
+int
+uci_to_blob(struct blob_buf *b, struct uci_section *s,
+	    const struct uci_blob_param_list *p)
+{
+	int ret = 0;
+	int i;
+
+	ret += __uci_to_blob(b, s, p);
+	for (i = 0; i < p->n_next; i++)
+		ret += uci_to_blob(b, s, p->next[i]);
+
+	return ret;
+}
+
+bool
+uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
+	      const struct uci_blob_param_list *config, unsigned long *diff)
+{
+	bool ret = false;
+	int i;
+
+	for (i = 0; i < config->n_params; i++) {
+		if (!tb1[i] && !tb2[i])
+			continue;
+
+		if (!!tb1[i] != !!tb2[i])
+			goto mark;
+
+		if (blob_len(tb1[i]) != blob_len(tb2[i]))
+			goto mark;
+
+		if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
+			goto mark;
+
+		continue;
+
+mark:
+		ret = true;
+		if (diff)
+			bitfield_set(diff, i);
+		else
+			return ret;
+	}
+
+	return ret;
+}
+
+
+static bool
+__uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
+		       const struct uci_blob_param_list *config)
+{
+	struct blob_attr **tb1, **tb2;
+
+	if (!!c1 ^ !!c2)
+		return false;
+
+	if (!c1 && !c2)
+		return true;
+
+	tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
+	blobmsg_parse(config->params, config->n_params, tb1,
+		blob_data(c1), blob_len(c1));
+
+	tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
+	blobmsg_parse(config->params, config->n_params, tb2,
+		blob_data(c2), blob_len(c2));
+
+	return !uci_blob_diff(tb1, tb2, config, NULL);
+}
+
+bool
+uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
+		     const struct uci_blob_param_list *config)
+{
+	int i;
+
+	if (!__uci_blob_check_equal(c1, c2, config))
+		return false;
+
+	for (i = 0; i < config->n_next; i++) {
+		if (!__uci_blob_check_equal(c1, c2, config->next[i]))
+			return false;
+	}
+
+	return true;
+}
diff --git a/uci_blob.h b/uci_blob.h
new file mode 100644
index 0000000..d2294d8
--- /dev/null
+++ b/uci_blob.h
@@ -0,0 +1,41 @@
+/*
+ * blob.c - uci <-> blobmsg conversion layer
+ * Copyright (C) 2012-2013 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+#ifndef __UCI_BLOB_H
+#define __UCI_BLOB_H
+
+#include <libubox/blobmsg.h>
+#include "uci.h"
+
+struct uci_blob_param_info {
+	enum blobmsg_type type;
+};
+
+struct uci_blob_param_list {
+	int n_params;
+	const struct blobmsg_policy *params;
+	const struct uci_blob_param_info *info;
+
+	int n_next;
+	const struct uci_blob_param_list *next[];
+};
+
+int uci_to_blob(struct blob_buf *b, struct uci_section *s,
+		const struct uci_blob_param_list *p);
+bool uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
+			  const struct uci_blob_param_list *config);
+bool uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
+		   const struct uci_blob_param_list *config,
+		   unsigned long *diff_bits);
+
+#endif