buf_writer.h

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/*
 * This file is part of Ninjaflight.
 *
 * Ninjaflight is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Ninjaflight is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Ninjaflight.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

// Called to flush the buffer.
typedef void (*bufWrite_t)(void *arg, void *data, int count);

typedef struct bufWriter_s {
    bufWrite_t writer;
    void *arg;
    uint8_t capacity;
    uint8_t at;
    uint8_t data[];
} bufWriter_t;

// Initialise a block of memory as a buffered writer.
//
// b should be sizeof(bufWriter_t) + the number of bytes to buffer.
// total_size should be the total size of b.
//
bufWriter_t *bufWriterInit(uint8_t *b, int total_size, bufWrite_t writer, void *p);
void bufWriterAppend(bufWriter_t *b, uint8_t ch);
void bufWriterFlush(bufWriter_t *b);