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       1                 :            : /*
       2                 :            :  * This file is part of the MicroPython project, http://micropython.org/
       3                 :            :  *
       4                 :            :  * The MIT License (MIT)
       5                 :            :  *
       6                 :            :  * Copyright (c) 2019 Jim Mussared
       7                 :            :  *
       8                 :            :  * Permission is hereby granted, free of charge, to any person obtaining a copy
       9                 :            :  * of this software and associated documentation files (the "Software"), to deal
      10                 :            :  * in the Software without restriction, including without limitation the rights
      11                 :            :  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      12                 :            :  * copies of the Software, and to permit persons to whom the Software is
      13                 :            :  * furnished to do so, subject to the following conditions:
      14                 :            :  *
      15                 :            :  * The above copyright notice and this permission notice shall be included in
      16                 :            :  * all copies or substantial portions of the Software.
      17                 :            :  *
      18                 :            :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      19                 :            :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      20                 :            :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      21                 :            :  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      22                 :            :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
      23                 :            :  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
      24                 :            :  * THE SOFTWARE.
      25                 :            :  */
      26                 :            : #include "ringbuf.h"
      27                 :            : 
      28                 :         12 : int ringbuf_get16(ringbuf_t *r) {
      29                 :         12 :     int v = ringbuf_peek16(r);
      30         [ +  + ]:         12 :     if (v == -1) {
      31                 :            :         return v;
      32                 :            :     }
      33                 :          8 :     r->iget += 2;
      34         [ +  + ]:          8 :     if (r->iget >= r->size) {
      35                 :          4 :         r->iget -= r->size;
      36                 :            :     }
      37                 :            :     return v;
      38                 :            : }
      39                 :            : 
      40                 :         12 : int ringbuf_peek16(ringbuf_t *r) {
      41         [ +  + ]:         12 :     if (r->iget == r->iput) {
      42                 :            :         return -1;
      43                 :            :     }
      44                 :         10 :     uint32_t iget_a = r->iget + 1;
      45         [ +  + ]:         10 :     if (iget_a == r->size) {
      46                 :          2 :         iget_a = 0;
      47                 :            :     }
      48         [ +  + ]:         10 :     if (iget_a == r->iput) {
      49                 :            :         return -1;
      50                 :            :     }
      51                 :          8 :     return (r->buf[r->iget] << 8) | (r->buf[iget_a]);
      52                 :            : }
      53                 :            : 
      54                 :         12 : int ringbuf_put16(ringbuf_t *r, uint16_t v) {
      55                 :         12 :     uint32_t iput_a = r->iput + 1;
      56         [ +  + ]:         12 :     if (iput_a == r->size) {
      57                 :          2 :         iput_a = 0;
      58                 :            :     }
      59         [ +  + ]:         12 :     if (iput_a == r->iget) {
      60                 :            :         return -1;
      61                 :            :     }
      62                 :         10 :     uint32_t iput_b = iput_a + 1;
      63         [ +  + ]:         10 :     if (iput_b == r->size) {
      64                 :          2 :         iput_b = 0;
      65                 :            :     }
      66         [ +  + ]:         10 :     if (iput_b == r->iget) {
      67                 :            :         return -1;
      68                 :            :     }
      69                 :          8 :     r->buf[r->iput] = (v >> 8) & 0xff;
      70                 :          8 :     r->buf[iput_a] = v & 0xff;
      71                 :          8 :     r->iput = iput_b;
      72                 :          8 :     return 0;
      73                 :            : }