1/* 2 * Dynamic data buffer 3 * Copyright (c) 2007-2009, Jouni Malinen <j@w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9#ifndef WPABUF_H 10#define WPABUF_H 11 12/* 13 * Internal data structure for wpabuf. Please do not touch this directly from 14 * elsewhere. This is only defined in header file to allow inline functions 15 * from this file to access data. 16 */ 17struct wpabuf { 18 size_t size; /* total size of the allocated buffer */ 19 size_t used; /* length of data in the buffer */ 20 u8 *ext_data; /* pointer to external data; NULL if data follows 21 * struct wpabuf */ 22 /* optionally followed by the allocated buffer */ 23}; 24 25 26int wpabuf_resize(struct wpabuf **buf, size_t add_len); 27struct wpabuf * wpabuf_alloc(size_t len); 28struct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len); 29struct wpabuf * wpabuf_alloc_copy(const void *data, size_t len); 30struct wpabuf * wpabuf_dup(const struct wpabuf *src); 31void wpabuf_free(struct wpabuf *buf); 32void * wpabuf_put(struct wpabuf *buf, size_t len); 33struct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b); 34struct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len); 35void wpabuf_printf(struct wpabuf *buf, char *fmt, ...) PRINTF_FORMAT(2, 3); 36 37 38/** 39 * wpabuf_size - Get the currently allocated size of a wpabuf buffer 40 * @buf: wpabuf buffer 41 * Returns: Currently allocated size of the buffer 42 */ 43static inline size_t wpabuf_size(const struct wpabuf *buf) 44{ 45 return buf->size; 46} 47 48/** 49 * wpabuf_len - Get the current length of a wpabuf buffer data 50 * @buf: wpabuf buffer 51 * Returns: Currently used length of the buffer 52 */ 53static inline size_t wpabuf_len(const struct wpabuf *buf) 54{ 55 return buf->used; 56} 57 58/** 59 * wpabuf_tailroom - Get size of available tail room in the end of the buffer 60 * @buf: wpabuf buffer 61 * Returns: Tail room (in bytes) of available space in the end of the buffer 62 */ 63static inline size_t wpabuf_tailroom(const struct wpabuf *buf) 64{ 65 return buf->size - buf->used; 66} 67 68/** 69 * wpabuf_head - Get pointer to the head of the buffer data 70 * @buf: wpabuf buffer 71 * Returns: Pointer to the head of the buffer data 72 */ 73static inline const void * wpabuf_head(const struct wpabuf *buf) 74{ 75 if (buf->ext_data) 76 return buf->ext_data; 77 return buf + 1; 78} 79 80static inline const u8 * wpabuf_head_u8(const struct wpabuf *buf) 81{ 82 return wpabuf_head(buf); 83} 84 85/** 86 * wpabuf_mhead - Get modifiable pointer to the head of the buffer data 87 * @buf: wpabuf buffer 88 * Returns: Pointer to the head of the buffer data 89 */ 90static inline void * wpabuf_mhead(struct wpabuf *buf) 91{ 92 if (buf->ext_data) 93 return buf->ext_data; 94 return buf + 1; 95} 96 97static inline u8 * wpabuf_mhead_u8(struct wpabuf *buf) 98{ 99 return wpabuf_mhead(buf); 100} 101 102static inline void wpabuf_put_u8(struct wpabuf *buf, u8 data) 103{ 104 u8 *pos = wpabuf_put(buf, 1); 105 *pos = data; 106} 107 108static inline void wpabuf_put_le16(struct wpabuf *buf, u16 data) 109{ 110 u8 *pos = wpabuf_put(buf, 2); 111 WPA_PUT_LE16(pos, data); 112} 113 114static inline void wpabuf_put_le32(struct wpabuf *buf, u32 data) 115{ 116 u8 *pos = wpabuf_put(buf, 4); 117 WPA_PUT_LE32(pos, data); 118} 119 120static inline void wpabuf_put_be16(struct wpabuf *buf, u16 data) 121{ 122 u8 *pos = wpabuf_put(buf, 2); 123 WPA_PUT_BE16(pos, data); 124} 125 126static inline void wpabuf_put_be24(struct wpabuf *buf, u32 data) 127{ 128 u8 *pos = wpabuf_put(buf, 3); 129 WPA_PUT_BE24(pos, data); 130} 131 132static inline void wpabuf_put_be32(struct wpabuf *buf, u32 data) 133{ 134 u8 *pos = wpabuf_put(buf, 4); 135 WPA_PUT_BE32(pos, data); 136} 137 138static inline void wpabuf_put_data(struct wpabuf *buf, const void *data, 139 size_t len) 140{ 141 if (data) 142 os_memcpy(wpabuf_put(buf, len), data, len); 143} 144 145static inline void wpabuf_put_buf(struct wpabuf *dst, 146 const struct wpabuf *src) 147{ 148 wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src)); 149} 150 151static inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len) 152{ 153 buf->ext_data = (u8 *) data; 154 buf->size = buf->used = len; 155} 156 157static inline void wpabuf_put_str(struct wpabuf *dst, const char *str) 158{ 159 wpabuf_put_data(dst, str, os_strlen(str)); 160} 161 162#endif /* WPABUF_H */ 163