Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* Copyright (C) 2010-2012 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <inttypes.h>
#include "blobmsg.h"
#include "blobmsg_json.h"
#ifdef JSONC
#include <json.h>
#else
#include <json/json.h>
#endif
bool blobmsg_add_object(struct blob_buf *b, json_object *obj)
{
json_object_object_foreach(obj, key, val) {
if (!blobmsg_add_json_element(b, key, val))
return false;
}
return true;
}
static bool blobmsg_add_array(struct blob_buf *b, struct array_list *a)
{
int i, len;
for (i = 0, len = array_list_length(a); i < len; i++) {
if (!blobmsg_add_json_element(b, NULL, array_list_get_idx(a, i)))
return false;
}
return true;
}
bool blobmsg_add_json_element(struct blob_buf *b, const char *name, json_object *obj)
{
bool ret = true;
void *c;
switch (json_object_get_type(obj)) {
case json_type_object:
c = blobmsg_open_table(b, name);
ret = blobmsg_add_object(b, obj);
blobmsg_close_table(b, c);
break;
case json_type_array:
c = blobmsg_open_array(b, name);
ret = blobmsg_add_array(b, json_object_get_array(obj));
blobmsg_close_array(b, c);
break;
case json_type_string:
blobmsg_add_string(b, name, json_object_get_string(obj));
break;
case json_type_boolean:
blobmsg_add_u8(b, name, json_object_get_boolean(obj));
break;
case json_type_int: {
int64_t i64 = json_object_get_int64(obj);
if (i64 >= INT32_MIN && i64 <= INT32_MAX) {
blobmsg_add_u32(b, name, (uint32_t)i64);
} else {
blobmsg_add_u64(b, name, (uint64_t)i64);
}
break;
}
case json_type_double:
blobmsg_add_double(b, name, json_object_get_double(obj));
break;
case json_type_null:
blobmsg_add_field(b, BLOBMSG_TYPE_UNSPEC, name, NULL, 0);
break;
default:
return false;
}
return ret;
}
static bool __blobmsg_add_json(struct blob_buf *b, json_object *obj)
{
bool ret = false;
if (!obj)
return false;
if (json_object_get_type(obj) != json_type_object)
goto out;
ret = blobmsg_add_object(b, obj);
out:
json_object_put(obj);
return ret;
}
bool blobmsg_add_json_from_file(struct blob_buf *b, const char *file)
{
return __blobmsg_add_json(b, json_object_from_file(file));
}
bool blobmsg_add_json_from_string(struct blob_buf *b, const char *str)
{
return __blobmsg_add_json(b, json_tokener_parse(str));
}
struct strbuf {
int len;
int pos;
char *buf;
blobmsg_json_format_t custom_format;
void *priv;
bool indent;
int indent_level;
};
static bool blobmsg_puts(struct strbuf *s, const char *c, int len)
{
size_t new_len;
char *new_buf;
if (len <= 0)
return true;
if (s->pos + len >= s->len) {
new_len = s->len + 16 + len;
new_buf = realloc(s->buf, new_len);
if (!new_buf)
return false;
s->len = new_len;
s->buf = new_buf;
}
memcpy(s->buf + s->pos, c, len);
s->pos += len;
return true;
}
static void add_separator(struct strbuf *s)
{
const char *indent_chars = "\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t";
size_t len;
if (!s->indent)
return;
len = s->indent_level + 1;
if (len > strlen(indent_chars))
len = strlen(indent_chars);
blobmsg_puts(s, indent_chars, len);
}
static void blobmsg_format_string(struct strbuf *s, const char *str)
{
const unsigned char *p, *last, *end;
char buf[8] = "\\u00";
end = (unsigned char *) str + strlen(str);
blobmsg_puts(s, "\"", 1);
for (p = (unsigned char *) str, last = p; *p; p++) {
char escape = '\0';
int len;
switch(*p) {
case '\b':
escape = 'b';
break;
case '\n':
escape = 'n';
break;
case '\t':
escape = 't';
break;
case '\r':
escape = 'r';
break;
case '"':
case '\\':
escape = *p;
break;
default:
if (*p < ' ')
escape = 'u';
break;
}
if (!escape)
continue;
if (p > last)
blobmsg_puts(s, (char *) last, p - last);
last = p + 1;
buf[1] = escape;
if (escape == 'u') {
snprintf(buf + 4, sizeof(buf) - 4, "%02x", (unsigned char) *p);
len = 6;
} else {
len = 2;
}
blobmsg_puts(s, buf, len);
}
blobmsg_puts(s, (char *) last, end - last);
blobmsg_puts(s, "\"", 1);
}
static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array);
static void blobmsg_format_element(struct strbuf *s, struct blob_attr *attr, bool without_name, bool head)
{
const char *data_str;
char buf[317];
void *data;
int len;
if (!blobmsg_check_attr(attr, false))
return;
if (!without_name && blobmsg_name(attr)[0]) {
blobmsg_format_string(s, blobmsg_name(attr));
blobmsg_puts(s, ": ", s->indent ? 2 : 1);
}
data = blobmsg_data(attr);
len = blobmsg_data_len(attr);
if (!head && s->custom_format) {
data_str = s->custom_format(s->priv, attr);
if (data_str)
goto out;
}
data_str = buf;
switch(blob_id(attr)) {
case BLOBMSG_TYPE_UNSPEC:
snprintf(buf, sizeof(buf), "null");
break;
case BLOBMSG_TYPE_BOOL:
snprintf(buf, sizeof(buf), "%s", *(uint8_t *)data ? "true" : "false");
break;
case BLOBMSG_TYPE_INT16:
snprintf(buf, sizeof(buf), "%" PRId16, (int16_t) be16_to_cpu(*(uint16_t *)data));
break;
case BLOBMSG_TYPE_INT32:
snprintf(buf, sizeof(buf), "%" PRId32, (int32_t) be32_to_cpu(*(uint32_t *)data));
break;
case BLOBMSG_TYPE_INT64:
snprintf(buf, sizeof(buf), "%" PRId64, (int64_t) be64_to_cpu(*(uint64_t *)data));
break;
case BLOBMSG_TYPE_DOUBLE:
snprintf(buf, sizeof(buf), "%lf", blobmsg_get_double(attr));
break;
case BLOBMSG_TYPE_STRING:
blobmsg_format_string(s, data);
return;
case BLOBMSG_TYPE_ARRAY:
blobmsg_format_json_list(s, data, len, true);
return;
case BLOBMSG_TYPE_TABLE:
blobmsg_format_json_list(s, data, len, false);
return;
}
out:
blobmsg_puts(s, data_str, strlen(data_str));
}
static void blobmsg_format_json_list(struct strbuf *s, struct blob_attr *attr, int len, bool array)
{
struct blob_attr *pos;
bool first = true;
size_t rem = len;
blobmsg_puts(s, (array ? "[" : "{" ), 1);
s->indent_level++;
add_separator(s);
__blob_for_each_attr(pos, attr, rem) {
if (!first) {
blobmsg_puts(s, ",", 1);
add_separator(s);
}
blobmsg_format_element(s, pos, array, false);
first = false;
}
s->indent_level--;
add_separator(s);
blobmsg_puts(s, (array ? "]" : "}"), 1);
}
static void setup_strbuf(struct strbuf *s, struct blob_attr *attr, blobmsg_json_format_t cb, void *priv, int indent)
{
s->len = blob_len(attr);
s->buf = malloc(s->len);
s->pos = 0;
s->custom_format = cb;
s->priv = priv;
s->indent = false;
if (indent >= 0) {
s->indent = true;
s->indent_level = indent;
}
}
char *blobmsg_format_json_with_cb(struct blob_attr *attr, bool list, blobmsg_json_format_t cb, void *priv, int indent)
{
struct strbuf s = {0};
bool array;
char *ret;
setup_strbuf(&s, attr, cb, priv, indent);
if (!s.buf)
return NULL;
array = blob_is_extended(attr) &&
blobmsg_type(attr) == BLOBMSG_TYPE_ARRAY;
if (list)
blobmsg_format_json_list(&s, blobmsg_data(attr), blobmsg_data_len(attr), array);
else
blobmsg_format_element(&s, attr, false, false);
if (!s.len) {
free(s.buf);
return NULL;
}
ret = realloc(s.buf, s.pos + 1);
if (!ret) {
free(s.buf);
return NULL;
}
ret[s.pos] = 0;
return ret;
}
char *blobmsg_format_json_value_with_cb(struct blob_attr *attr, blobmsg_json_format_t cb, void *priv, int indent)
{
struct strbuf s = {0};
char *ret;
setup_strbuf(&s, attr, cb, priv, indent);
if (!s.buf)
return NULL;
blobmsg_format_element(&s, attr, true, false);
if (!s.len) {
free(s.buf);
return NULL;
}
ret = realloc(s.buf, s.pos + 1);
if (!ret) {
free(s.buf);
return NULL;
}
ret[s.pos] = 0;
return ret;
}