121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Jim Mussared
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "ringbuf.h"
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int ringbuf_get16(ringbuf_t *r) {
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int v = ringbuf_peek16(r);
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if (v == -1) {
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return v;
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}
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r->iget += 2;
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if (r->iget >= r->size) {
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r->iget -= r->size;
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}
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return v;
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}
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int ringbuf_peek16(ringbuf_t *r) {
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if (r->iget == r->iput) {
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return -1;
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}
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uint32_t iget_a = r->iget + 1;
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if (iget_a == r->size) {
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iget_a = 0;
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}
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if (iget_a == r->iput) {
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return -1;
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}
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return (r->buf[r->iget] << 8) | (r->buf[iget_a]);
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}
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int ringbuf_put16(ringbuf_t *r, uint16_t v) {
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uint32_t iput_a = r->iput + 1;
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if (iput_a == r->size) {
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iput_a = 0;
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}
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if (iput_a == r->iget) {
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return -1;
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}
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uint32_t iput_b = iput_a + 1;
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if (iput_b == r->size) {
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iput_b = 0;
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}
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if (iput_b == r->iget) {
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return -1;
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}
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r->buf[r->iput] = (v >> 8) & 0xff;
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r->buf[iput_a] = v & 0xff;
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r->iput = iput_b;
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return 0;
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}
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// Returns:
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// 0: Success
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// -1: Not enough data available to complete read (try again later)
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// -2: Requested read is larger than buffer - will never succeed
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int ringbuf_get_bytes(ringbuf_t *r, uint8_t *data, size_t data_len) {
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if (ringbuf_avail(r) < data_len) {
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return (r->size <= data_len) ? -2 : -1;
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}
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uint32_t iget = r->iget;
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uint32_t iget_a = (iget + data_len) % r->size;
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uint8_t *datap = data;
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if (iget_a < iget) {
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// Copy part of the data from the space left at the end of the buffer
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memcpy(datap, r->buf + iget, r->size - iget);
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datap += (r->size - iget);
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iget = 0;
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}
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memcpy(datap, r->buf + iget, iget_a - iget);
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r->iget = iget_a;
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return 0;
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}
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// Returns:
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// 0: Success
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// -1: Not enough free space available to complete write (try again later)
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// -2: Requested write is larger than buffer - will never succeed
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int ringbuf_put_bytes(ringbuf_t *r, const uint8_t *data, size_t data_len) {
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if (ringbuf_free(r) < data_len) {
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return (r->size <= data_len) ? -2 : -1;
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}
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uint32_t iput = r->iput;
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uint32_t iput_a = (iput + data_len) % r->size;
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const uint8_t *datap = data;
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if (iput_a < iput) {
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// Copy part of the data to the end of the buffer
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memcpy(r->buf + iput, datap, r->size - iput);
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datap += (r->size - iput);
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iput = 0;
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}
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memcpy(r->buf + iput, datap, iput_a - iput);
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r->iput = iput_a;
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return 0;
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}
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