winstream.h

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/*
 * Copyright (c) 2021 Intel Corporation
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef ZEPHYR_INCLUDE_SYS_WINSTREAM_H_
#define ZEPHYR_INCLUDE_SYS_WINSTREAM_H_
 
#include <stdint.h>
 
struct sys_winstream {
        uint32_t len;   /* Length of data[] in bytes */
        uint32_t start; /* Index of first valid byte in data[] */
        uint32_t end;   /* Index of next byte in data[] to write */
        uint32_t seq;   /* Mod-2^32 index of 'end' since stream init */
        uint8_t data[];
};
 
static inline struct sys_winstream *sys_winstream_init(void *buf, int buflen)
{
        struct sys_winstream *ws = buf, tmp = { .len = buflen - sizeof(*ws) };
 
        *ws = tmp;
        return ws;
}
 
void sys_winstream_write(struct sys_winstream *ws,
                         const char *data, uint32_t len);
 
uint32_t sys_winstream_read(struct sys_winstream *ws,
                            uint32_t *seq, char *buf, uint32_t buflen);
 
#endif /* ZEPHYR_INCLUDE_SYS_WINSTREAM_H_ */