jshn: shorten JSON_VAR to J_V

[project/libubox.git] / blob.c

diff --git a/blob.c b/blob.c
index edf55d4..ec8617b 100644 (file)
--- a/blob.c
+++ b/blob.c
@@ -3,14 +3,17 @@
  *
  * Copyright (C) 2010 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
+ * 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.
  *
- * 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 General Public License for more details.
+ * 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 "blob.h"
@@ -18,9 +21,15 @@
 static bool
 blob_buffer_grow(struct blob_buf *buf, int minlen)
 {
-       buf->buflen += ((minlen / 256) + 1) * 256;
-       buf->buf = realloc(buf->buf, buf->buflen);
-       return !!buf->buf;
+       struct blob_buf *new;
+       int delta = ((minlen / 256) + 1) * 256;
+       new = realloc(buf->buf, buf->buflen + delta);
+       if (new) {
+               buf->buf = new;
+               memset(buf->buf + buf->buflen, 0, delta);
+               buf->buflen += delta;
+       }
+       return !!new;
 }
 
 static void
@@ -34,36 +43,45 @@ blob_init(struct blob_attr *attr, int id, unsigned int len)
 static inline struct blob_attr *
 offset_to_attr(struct blob_buf *buf, int offset)
 {
-       void *ptr = (char *)buf->buf + offset;
+       void *ptr = (char *)buf->buf + offset - BLOB_COOKIE;
        return ptr;
 }
 
 static inline int
 attr_to_offset(struct blob_buf *buf, struct blob_attr *attr)
 {
-       return (char *)attr - (char *) buf->buf;
+       return (char *)attr - (char *) buf->buf + BLOB_COOKIE;
+}
+
+bool
+blob_buf_grow(struct blob_buf *buf, int required)
+{
+       int offset_head = attr_to_offset(buf, buf->head);
+
+       if (!buf->grow || !buf->grow(buf, required))
+               return false;
+
+       buf->head = offset_to_attr(buf, offset_head);
+       return true;
 }
 
 static struct blob_attr *
 blob_add(struct blob_buf *buf, struct blob_attr *pos, int id, int payload)
 {
        int offset = attr_to_offset(buf, pos);
-       int required = (offset + sizeof(struct blob_attr) + payload) - buf->buflen;
+       int required = (offset - BLOB_COOKIE + sizeof(struct blob_attr) + payload) - buf->buflen;
        struct blob_attr *attr;
 
        if (required > 0) {
-               int offset_head = attr_to_offset(buf, buf->head);
-
-               if (!buf->grow || !buf->grow(buf, required))
+               if (!blob_buf_grow(buf, required))
                        return NULL;
-
-               buf->head = offset_to_attr(buf, offset_head);
                attr = offset_to_attr(buf, offset);
        } else {
                attr = pos;
        }
 
        blob_init(attr, id, payload + sizeof(struct blob_attr));
+       blob_fill_pad(attr);
        return attr;
 }
 
@@ -88,6 +106,25 @@ blob_buf_free(struct blob_buf *buf)
        buf->buflen = 0;
 }
 
+void
+blob_fill_pad(struct blob_attr *attr)
+{
+       char *buf = (char *) attr;
+       int len = blob_pad_len(attr);
+       int delta = len - blob_raw_len(attr);
+
+       if (delta > 0)
+               memset(buf + len - delta, 0, delta);
+}
+
+void
+blob_set_raw_len(struct blob_attr *attr, unsigned int len)
+{
+       len &= BLOB_ATTR_LEN_MASK;
+       attr->id_len &= ~cpu_to_be32(BLOB_ATTR_LEN_MASK);
+       attr->id_len |= cpu_to_be32(len);
+}
+
 struct blob_attr *
 blob_new(struct blob_buf *buf, int id, int payload)
 {
@@ -102,7 +139,23 @@ blob_new(struct blob_buf *buf, int id, int payload)
 }
 
 struct blob_attr *
-blob_put(struct blob_buf *buf, int id, const void *ptr, int len)
+blob_put_raw(struct blob_buf *buf, const void *ptr, unsigned int len)
+{
+       struct blob_attr *attr;
+
+       if (len < sizeof(struct blob_attr) || !ptr)
+               return NULL;
+
+       attr = blob_add(buf, blob_next(buf->head), 0, len - sizeof(struct blob_attr));
+       if (!attr)
+               return NULL;
+       blob_set_raw_len(buf->head, blob_pad_len(buf->head) + len);
+       memcpy(attr, ptr, len);
+       return attr;
+}
+
+struct blob_attr *
+blob_put(struct blob_buf *buf, int id, const void *ptr, unsigned int len)
 {
        struct blob_attr *attr;
 
@@ -120,6 +173,8 @@ blob_nest_start(struct blob_buf *buf, int id)
 {
        unsigned long offset = attr_to_offset(buf, buf->head);
        buf->head = blob_new(buf, id, 0);
+       if (!buf->head)
+               return NULL;
        return (void *) offset;
 }
 
@@ -140,7 +195,7 @@ static const int blob_type_minlen[BLOB_ATTR_LAST] = {
 };
 
 bool
-blob_check_type(const void *ptr, int len, int type)
+blob_check_type(const void *ptr, unsigned int len, int type)
 {
        const char *data = ptr;
 
@@ -190,7 +245,7 @@ blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_at
                        if (info[id].maxlen && len > info[id].maxlen)
                                continue;
 
-                       if (info[id].validate && !info[id].validate(&info[id], attr))
+                       if (info[id].validate && !info[id].validate(&info[id], pos))
                                continue;
                }
 
@@ -216,3 +271,17 @@ blob_attr_equal(const struct blob_attr *a1, const struct blob_attr *a2)
 
        return !memcmp(a1, a2, blob_pad_len(a1));
 }
+
+struct blob_attr *
+blob_memdup(struct blob_attr *attr)
+{
+       struct blob_attr *ret;
+       int size = blob_pad_len(attr);
+
+       ret = malloc(size);
+       if (!ret)
+               return NULL;
+
+       memcpy(ret, attr, size);
+       return ret;
+}