+Documentation
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adamdunkels
parent
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1 changed files with 223 additions and 27 deletions
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@ -28,7 +28,7 @@
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*
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*
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* This file is part of the Contiki operating system.
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* This file is part of the Contiki operating system.
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*
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*
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* $Id: rimebuf.h,v 1.1 2007/02/28 16:38:52 adamdunkels Exp $
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* $Id: rimebuf.h,v 1.2 2007/03/13 10:27:36 adamdunkels Exp $
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*/
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*/
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/**
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/**
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@ -38,37 +38,233 @@
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* Adam Dunkels <adam@sics.se>
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* Adam Dunkels <adam@sics.se>
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*/
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*/
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#ifndef __NETBUF_H__
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#ifndef __RIMEBUF_H__
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#define __NETBUF_H__
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#define __RIMEBUF_H__
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#include "contiki-net.h"
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#include "contiki-net.h"
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#define NETBUF_SIZE 128
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/**
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#define NETBUF_HDR_SIZE 16
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* \brief The size of the rimebuf, in bytes
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*/
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#define RIMEBUF_SIZE 128
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void *rimebuf_dataptr(void);
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/**
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void *rimebuf_hdrptr(void);
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* \brief The size of the rimebuf header, in bytes
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*/
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u8_t rimebuf_hdrlen(void);
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#define RIMEBUF_HDR_SIZE 16
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u16_t rimebuf_len(void);
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void rimebuf_set_len(u16_t len);
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void rimebuf_reference(void *ptr, u16_t len);
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int rimebuf_is_reference(void);
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void *rimebuf_reference_ptr(void);
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int rimebuf_copyfrom(u8_t *from, u16_t len);
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int rimebuf_copyto(u8_t *to);
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int rimebuf_copyto_hdr(u8_t *to);
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int rimebuf_hdrextend(int size);
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int rimebuf_hdrreduce(int size);
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/**
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* \brief Clear and reset the rimebuf
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*
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* This function clears the rimebuf and resets all
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* internal state pointers (header size, header pointer,
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* external data pointer). It is used before preparing a
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* packet in the rimebuf.
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*
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*/
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void rimebuf_clear(void);
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void rimebuf_clear(void);
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/**
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* \brief Get a pointer to the data in the rimebuf
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* \return Pointer to the rimebuf data
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*
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* This function is used to get a pointer to the data in
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* the rimebuf. The data is either stored in the rimebuf,
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* or referenced to an external location.
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. The header is accessed with the
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* rimebuf_hdrptr() function.
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*
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* For incoming packets, both the packet header and the
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* packet data is stored in the data portion of the
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* rimebuf. Thus this function is used to get a pointer to
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* the header for incoming packets.
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*
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*/
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void *rimebuf_dataptr(void);
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#endif /* __NETBUF_H__ */
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/**
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* \brief Get a pointer to the header in the rimebuf, for outbound packets
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* \return Pointer to the rimebuf header
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to get a
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* pointer to the header in the rimebuf. The header is
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* stored in the rimebuf.
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*
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*/
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void *rimebuf_hdrptr(void);
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/**
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* \brief Get the length of the header in the rimebuf, for outbound packets
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* \return Pointer to the rimebuf header
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to get
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* the length of the header in the rimebuf. The header is
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* stored in the rimebuf and accessed via the
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* rimebuf_hdrptr() function.
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*
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*/
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u8_t rimebuf_hdrlen(void);
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/**
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* \brief Get the length of the data in the rimebuf
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* \return Pointer to the rimebuf header
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to get
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* the length of the data in the rimebuf. The data is
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* stored in the rimebuf and accessed via the
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* rimebuf_dataptr() function.
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*
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* For incoming packets, both the packet header and the
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* packet data is stored in the data portion of the
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* rimebuf. This function is then used to get the total
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* length of the packet - both header and data.
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*
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*/
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u16_t rimebuf_datalen(void);
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/**
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* \brief Set the length of the data in the rimebuf
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* \param len The length of the data
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to set
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* the length of the data in the rimebuf.
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*/
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void rimebuf_set_datalen(u16_t len);
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/**
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* \brief Point the rimebuf to external data
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* \param ptr A pointer to the external data
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* \param len The length of the external data
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to make
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* the rimebuf point to external data. The function also
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* specifies the length of the external data that the
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* rimebuf references.
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*/
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void rimebuf_reference(void *ptr, u16_t len);
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/**
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* \brief Check if the rimebuf references external data
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* \retval Non-zero if the rimebuf references external data, zero otherwise.
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. This function is used to check
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* if the rimebuf points to external data that has
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* previously been referenced with rimebuf_reference().
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*
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*/
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int rimebuf_is_reference(void);
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/**
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* \brief Get a pointer to external data referenced by the rimebuf
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* \retval A pointer to the external data
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*
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* For outbound packets, the rimebuf consists of two
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* parts: header and data. The data may point to external
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* data that has previously been referenced with
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* rimebuf_reference(). This function is used to get a
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* pointer to the external data.
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*
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*/
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void *rimebuf_reference_ptr(void);
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/**
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* \brief Copy referenced data from the external location into the rimebuf
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*
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* This function copies external data that has previously
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* been referenced with rimebuf_reference() into the
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* rimebuf.
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*
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*/
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void rimebuf_copy_reference(void);
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/**
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* \brief Copy from external data into the rimebuf
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* \param from A pointer to the data from which to copy
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* \param len The size of the data to copy
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* \retval The number of bytes that was copied into the rimebuf
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*
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* This function copies data from a pointer into the
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* rimebuf. If the data that is to be copied is larger
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* than the rimebuf, only the data that fits in the
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* rimebuf is copied. The number of bytes that could be
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* copied into the rimbuf is returned.
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*
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*/
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int rimebuf_copyfrom(u8_t *from, u16_t len);
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/**
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* \brief Copy the entire rimebuf to an external buffer
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* \param to A pointer to the buffer to which the data is to be copied
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* \retval The number of bytes that was copied to the external buffer
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*
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* This function copies the rimebuf to an external
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* buffer. Both the data portion and the header portion of
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* the rimebuf is copied. If the rimebuf referenced
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* external data (referenced with rimebuf_reference()) the
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* external data is copied.
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*
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* The external buffer to which the rimebuf is to be
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* copied must be able to accomodate at least
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* (RIMEBUF_SIZE + RIMEBUF_HDR_SIZE) bytes. The number of
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* bytes that was copied to the external buffer is
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* returned.
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*
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*/
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int rimebuf_copyto(u8_t *to);
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/**
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* \brief Copy the header portion of the rimebuf to an external buffer
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* \param to A pointer to the buffer to which the data is to be copied
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* \retval The number of bytes that was copied to the external buffer
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*
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* This function copies the header portion of the rimebuf
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* to an external buffer.
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*
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* The external buffer to which the rimebuf is to be
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* copied must be able to accomodate at least
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* RIMEBUF_HDR_SIZE bytes. The number of bytes that was
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* copied to the external buffer is returned.
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*
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*/
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int rimebuf_copyto_hdr(u8_t *to);
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/**
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* \brief Extend the header of the rimebuf, for outbound packets
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* \param size The number of bytes the header should be extended
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* \retval Non-zero if the header could be extended, zero otherwise
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*
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* This function is used to allocate extra space in the
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* header portion in the rimebuf, when preparing outbound
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* packets for transmission. If the function is unable to
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* allocate sufficient header space, the function returns
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* zero and does not allocate anything.
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*
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*/
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int rimebuf_hdrextend(int size);
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/**
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* \brief Reduce the header in the rimebuf, for incoming packets
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* \param size The number of bytes the header should be reduced
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* \retval Non-zero if the header could be reduced, zero otherwise
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*
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* This function is used to remove the first part of the
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* header in the rimebuf, when processing incoming
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* packets. If the function is unable to remove the
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* requested amount of header space, the function returns
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* zero and does not allocate anything.
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*
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*/
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int rimebuf_hdrreduce(int size);
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#endif /* __RIMEBUF_H__ */
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