3 * Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
20 static void wpabuf_overflow(const struct wpabuf *buf, size_t len)
22 wpa_printf(MSG_ERROR, "wpabuf %p (size=%lu used=%lu) overflow len=%lu",
23 buf, (unsigned long) buf->size, (unsigned long) buf->used,
29 int wpabuf_resize(struct wpabuf **_buf, size_t add_len)
31 struct wpabuf *buf = *_buf;
32 if (buf->used + add_len > buf->size) {
35 nbuf = os_realloc(buf->ext_data, buf->used + add_len);
38 os_memset(nbuf + buf->used, 0, add_len);
41 nbuf = os_realloc(buf, sizeof(struct wpabuf) +
45 buf = (struct wpabuf *) nbuf;
46 os_memset(nbuf + sizeof(struct wpabuf) + buf->used, 0,
50 buf->size = buf->used + add_len;
58 * wpabuf_alloc - Allocate a wpabuf of the given size
59 * @len: Length for the allocated buffer
60 * Returns: Buffer to the allocated wpabuf or %NULL on failure
62 struct wpabuf * wpabuf_alloc(size_t len)
64 struct wpabuf *buf = os_zalloc(sizeof(struct wpabuf) + len);
72 struct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len)
74 struct wpabuf *buf = os_zalloc(sizeof(struct wpabuf));
86 struct wpabuf * wpabuf_alloc_copy(const void *data, size_t len)
88 struct wpabuf *buf = wpabuf_alloc(len);
90 wpabuf_put_data(buf, data, len);
95 struct wpabuf * wpabuf_dup(const struct wpabuf *src)
97 struct wpabuf *buf = wpabuf_alloc(wpabuf_len(src));
99 wpabuf_put_data(buf, wpabuf_head(src), wpabuf_len(src));
105 * wpabuf_free - Free a wpabuf
106 * @buf: wpabuf buffer
108 void wpabuf_free(struct wpabuf *buf)
112 os_free(buf->ext_data);
117 void * wpabuf_put(struct wpabuf *buf, size_t len)
119 void *tmp = wpabuf_mhead_u8(buf) + wpabuf_len(buf);
121 if (buf->used > buf->size) {
122 wpabuf_overflow(buf, len);
129 * wpabuf_concat - Concatenate two buffers into a newly allocated one
132 * Returns: wpabuf with concatenated a + b data or %NULL on failure
134 * Both buffers a and b will be freed regardless of the return value. Input
135 * buffers can be %NULL which is interpreted as an empty buffer.
137 struct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b)
139 struct wpabuf *n = NULL;
146 len += wpabuf_len(a);
148 len += wpabuf_len(b);
150 n = wpabuf_alloc(len);
153 wpabuf_put_buf(n, a);
155 wpabuf_put_buf(n, b);
166 * wpabuf_zeropad - Pad buffer with 0x00 octets (prefix) to specified length
167 * @buf: Buffer to be padded
168 * @len: Length for the padded buffer
169 * Returns: wpabuf padded to len octets or %NULL on failure
171 * If buf is longer than len octets or of same size, it will be returned as-is.
172 * Otherwise a new buffer is allocated and prefixed with 0x00 octets followed
173 * by the source data. The source buffer will be freed on error, i.e., caller
174 * will only be responsible on freeing the returned buffer. If buf is %NULL,
175 * %NULL will be returned.
177 struct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len)
185 blen = wpabuf_len(buf);
189 ret = wpabuf_alloc(len);
191 os_memset(wpabuf_put(ret, len - blen), 0, len - blen);
192 wpabuf_put_buf(ret, buf);
200 void wpabuf_printf(struct wpabuf *buf, char *fmt, ...)
203 void *tmp = wpabuf_mhead_u8(buf) + wpabuf_len(buf);
207 res = vsnprintf(tmp, buf->size - buf->used, fmt, ap);
209 if (res < 0 || (size_t) res >= buf->size - buf->used)
210 wpabuf_overflow(buf, res);