1189251Ssam/* 2189251Ssam * Dynamic data buffer 3252726Srpaulo * Copyright (c) 2007-2012, Jouni Malinen <j@w1.fi> 4189251Ssam * 5252726Srpaulo * This software may be distributed under the terms of the BSD license. 6252726Srpaulo * See README for more details. 7189251Ssam */ 8189251Ssam 9189251Ssam#ifndef WPABUF_H 10189251Ssam#define WPABUF_H 11189251Ssam 12252726Srpaulo/* wpabuf::buf is a pointer to external data */ 13252726Srpaulo#define WPABUF_FLAG_EXT_DATA BIT(0) 14252726Srpaulo 15189251Ssam/* 16189251Ssam * Internal data structure for wpabuf. Please do not touch this directly from 17189251Ssam * elsewhere. This is only defined in header file to allow inline functions 18189251Ssam * from this file to access data. 19189251Ssam */ 20189251Ssamstruct wpabuf { 21189251Ssam size_t size; /* total size of the allocated buffer */ 22189251Ssam size_t used; /* length of data in the buffer */ 23252726Srpaulo u8 *buf; /* pointer to the head of the buffer */ 24252726Srpaulo unsigned int flags; 25189251Ssam /* optionally followed by the allocated buffer */ 26189251Ssam}; 27189251Ssam 28189251Ssam 29189251Ssamint wpabuf_resize(struct wpabuf **buf, size_t add_len); 30189251Ssamstruct wpabuf * wpabuf_alloc(size_t len); 31189251Ssamstruct wpabuf * wpabuf_alloc_ext_data(u8 *data, size_t len); 32189251Ssamstruct wpabuf * wpabuf_alloc_copy(const void *data, size_t len); 33189251Ssamstruct wpabuf * wpabuf_dup(const struct wpabuf *src); 34189251Ssamvoid wpabuf_free(struct wpabuf *buf); 35189251Ssamvoid * wpabuf_put(struct wpabuf *buf, size_t len); 36189251Ssamstruct wpabuf * wpabuf_concat(struct wpabuf *a, struct wpabuf *b); 37189251Ssamstruct wpabuf * wpabuf_zeropad(struct wpabuf *buf, size_t len); 38189251Ssamvoid wpabuf_printf(struct wpabuf *buf, char *fmt, ...) PRINTF_FORMAT(2, 3); 39189251Ssam 40189251Ssam 41189251Ssam/** 42189251Ssam * wpabuf_size - Get the currently allocated size of a wpabuf buffer 43189251Ssam * @buf: wpabuf buffer 44189251Ssam * Returns: Currently allocated size of the buffer 45189251Ssam */ 46189251Ssamstatic inline size_t wpabuf_size(const struct wpabuf *buf) 47189251Ssam{ 48189251Ssam return buf->size; 49189251Ssam} 50189251Ssam 51189251Ssam/** 52189251Ssam * wpabuf_len - Get the current length of a wpabuf buffer data 53189251Ssam * @buf: wpabuf buffer 54189251Ssam * Returns: Currently used length of the buffer 55189251Ssam */ 56189251Ssamstatic inline size_t wpabuf_len(const struct wpabuf *buf) 57189251Ssam{ 58189251Ssam return buf->used; 59189251Ssam} 60189251Ssam 61189251Ssam/** 62189251Ssam * wpabuf_tailroom - Get size of available tail room in the end of the buffer 63189251Ssam * @buf: wpabuf buffer 64189251Ssam * Returns: Tail room (in bytes) of available space in the end of the buffer 65189251Ssam */ 66189251Ssamstatic inline size_t wpabuf_tailroom(const struct wpabuf *buf) 67189251Ssam{ 68189251Ssam return buf->size - buf->used; 69189251Ssam} 70189251Ssam 71189251Ssam/** 72189251Ssam * wpabuf_head - Get pointer to the head of the buffer data 73189251Ssam * @buf: wpabuf buffer 74189251Ssam * Returns: Pointer to the head of the buffer data 75189251Ssam */ 76189251Ssamstatic inline const void * wpabuf_head(const struct wpabuf *buf) 77189251Ssam{ 78252726Srpaulo return buf->buf; 79189251Ssam} 80189251Ssam 81189251Ssamstatic inline const u8 * wpabuf_head_u8(const struct wpabuf *buf) 82189251Ssam{ 83189251Ssam return wpabuf_head(buf); 84189251Ssam} 85189251Ssam 86189251Ssam/** 87189251Ssam * wpabuf_mhead - Get modifiable pointer to the head of the buffer data 88189251Ssam * @buf: wpabuf buffer 89189251Ssam * Returns: Pointer to the head of the buffer data 90189251Ssam */ 91189251Ssamstatic inline void * wpabuf_mhead(struct wpabuf *buf) 92189251Ssam{ 93252726Srpaulo return buf->buf; 94189251Ssam} 95189251Ssam 96189251Ssamstatic inline u8 * wpabuf_mhead_u8(struct wpabuf *buf) 97189251Ssam{ 98189251Ssam return wpabuf_mhead(buf); 99189251Ssam} 100189251Ssam 101189251Ssamstatic inline void wpabuf_put_u8(struct wpabuf *buf, u8 data) 102189251Ssam{ 103189251Ssam u8 *pos = wpabuf_put(buf, 1); 104189251Ssam *pos = data; 105189251Ssam} 106189251Ssam 107214734Srpaulostatic inline void wpabuf_put_le16(struct wpabuf *buf, u16 data) 108214734Srpaulo{ 109214734Srpaulo u8 *pos = wpabuf_put(buf, 2); 110214734Srpaulo WPA_PUT_LE16(pos, data); 111214734Srpaulo} 112214734Srpaulo 113252726Srpaulostatic inline void wpabuf_put_le32(struct wpabuf *buf, u32 data) 114252726Srpaulo{ 115252726Srpaulo u8 *pos = wpabuf_put(buf, 4); 116252726Srpaulo WPA_PUT_LE32(pos, data); 117252726Srpaulo} 118252726Srpaulo 119189251Ssamstatic inline void wpabuf_put_be16(struct wpabuf *buf, u16 data) 120189251Ssam{ 121189251Ssam u8 *pos = wpabuf_put(buf, 2); 122189251Ssam WPA_PUT_BE16(pos, data); 123189251Ssam} 124189251Ssam 125189251Ssamstatic inline void wpabuf_put_be24(struct wpabuf *buf, u32 data) 126189251Ssam{ 127189251Ssam u8 *pos = wpabuf_put(buf, 3); 128189251Ssam WPA_PUT_BE24(pos, data); 129189251Ssam} 130189251Ssam 131189251Ssamstatic inline void wpabuf_put_be32(struct wpabuf *buf, u32 data) 132189251Ssam{ 133189251Ssam u8 *pos = wpabuf_put(buf, 4); 134189251Ssam WPA_PUT_BE32(pos, data); 135189251Ssam} 136189251Ssam 137189251Ssamstatic inline void wpabuf_put_data(struct wpabuf *buf, const void *data, 138189251Ssam size_t len) 139189251Ssam{ 140189251Ssam if (data) 141189251Ssam os_memcpy(wpabuf_put(buf, len), data, len); 142189251Ssam} 143189251Ssam 144189251Ssamstatic inline void wpabuf_put_buf(struct wpabuf *dst, 145189251Ssam const struct wpabuf *src) 146189251Ssam{ 147189251Ssam wpabuf_put_data(dst, wpabuf_head(src), wpabuf_len(src)); 148189251Ssam} 149189251Ssam 150189251Ssamstatic inline void wpabuf_set(struct wpabuf *buf, const void *data, size_t len) 151189251Ssam{ 152252726Srpaulo buf->buf = (u8 *) data; 153252726Srpaulo buf->flags = WPABUF_FLAG_EXT_DATA; 154189251Ssam buf->size = buf->used = len; 155189251Ssam} 156189251Ssam 157189251Ssamstatic inline void wpabuf_put_str(struct wpabuf *dst, const char *str) 158189251Ssam{ 159189251Ssam wpabuf_put_data(dst, str, os_strlen(str)); 160189251Ssam} 161189251Ssam 162189251Ssam#endif /* WPABUF_H */ 163