uip_arch.h

STC51系列的源码

#ifndef __UIP_ARCH_H__
#define __UIP_ARCH_H__

#include "uip.h"

/**
 * Carry out a 32-bit addition.
 *
 * Because not all architectures for which uIP is intended has native
 * 32-bit arithmetic, uIP uses an external C function for doing the
 * required 32-bit additions in the TCP protocol processing. This
 * function should add the two arguments and place the result in the
 * global variable uip_acc32.
 *
 * \note The 32-bit integer pointed to by the op32 parameter and the
 * result in the uip_acc32 variable are in network byte order (big
 * endian).
 *
 * \param op32 A pointer to a 4-byte array representing a 32-bit
 * integer in network byte order (big endian).
 *
 * \param op16 A 16-bit integer in host byte order.
 */
void uip_add32(u8_t *op32, u16_t op16);

/**
 * Calculate the Internet checksum over a buffer.
 *
 * The Internet checksum is the one's complement of the one's
 * complement sum of all 16-bit words in the buffer.
 *
 * See RFC1071.
 *
 * \note This function is not called in the current version of uIP,
 * but future versions might make use of it.
 *
 * \param buf A pointer to the buffer over which the checksum is to be
 * computed.
 *
 * \param len The length of the buffer over which the checksum is to
 * be computed.
 *
 * \return The Internet checksum of the buffer.
 */
u16_t uip_chksum(u16_t sum, u16_t * buffer, u16_t size);

/**
 * Calculate the IP header checksum of the packet header in uip_buf.
 *
 * The IP header checksum is the Internet checksum of the 20 bytes of
 * the IP header.
 *
 * \return The IP header checksum of the IP header in the uip_buf
 * buffer.
 */
u16_t uip_ipchksum(void);

/**
 * Calculate the TCP checksum of the packet in uip_buf and uip_appdata.
 *
 * The TCP checksum is the Internet checksum of data contents of the
 * TCP segment, and a pseudo-header as defined in RFC793.
 *
 * \note The uip_appdata pointer that points to the packet data may
 * point anywhere in memory, so it is not possible to simply calculate
 * the Internet checksum of the contents of the uip_buf buffer.
 *
 * \return The TCP checksum of the TCP segment in uip_buf and pointed
 * to by uip_appdata.
 */
u16_t uip_tcpchksum(void);

/** @} */

#endif /* __UIP_ARCH_H__ */