#include "hyp_ringbuffer.h"

void RingBuffer_Init(HYP_RINGBUFFER_Handle ringBuffer)
{
    if (ringBuffer == 0)
    {
        return;
    }

    ringBuffer->head = 0U;
    ringBuffer->tail = 0U;
}

uint16_t RingBuffer_Write(HYP_RINGBUFFER_Handle ringBuffer, const uint8_t *data, uint16_t len)
{
    uint16_t i;

    if ((ringBuffer == 0) || (data == 0))
    {
        return 0U;
    }

    for (i = 0U; i < len; i++)
    {
        uint16_t next = (uint16_t)((ringBuffer->head + 1U) % HYP_RINGBUFFER_SIZE);
        if (next == ringBuffer->tail)
        {
            break;
        }

        ringBuffer->buffer[ringBuffer->head] = data[i];
        ringBuffer->head = next;
    }

    return i;
}

uint16_t RingBuffer_Read(HYP_RINGBUFFER_Handle ringBuffer, uint8_t *data, uint16_t len)
{
    uint16_t i;

    if ((ringBuffer == 0) || (data == 0))
    {
        return 0U;
    }

    for (i = 0U; i < len; i++)
    {
        if (ringBuffer->tail == ringBuffer->head)
        {
            break;
        }

        data[i] = ringBuffer->buffer[ringBuffer->tail];
        ringBuffer->tail = (uint16_t)((ringBuffer->tail + 1U) % HYP_RINGBUFFER_SIZE);
    }

    return i;
}

uint16_t RingBuffer_Available(HYP_RINGBUFFER_Handle ringBuffer)
{
    if (ringBuffer == 0)
    {
        return 0U;
    }

    return (uint16_t)((ringBuffer->head + HYP_RINGBUFFER_SIZE - ringBuffer->tail) % HYP_RINGBUFFER_SIZE);
}