#include "test_io.h"

#include <string.h>

static ssize_t test_reader_read(void *ctx, uint8_t *buf, size_t len)
{
    struct test_reader_config *config = (struct test_reader_config *)ctx;
    const unsigned available = config->len - config->pos;
    const unsigned to_read = len <= available ? len : available;
    memcpy(buf, &config->buf[config->pos], to_read);
    config->pos += to_read;
    return to_read;
}

void test_reader(struct test_reader_config *config, struct io_reader *reader_out)
{
    reader_out->ctx = config;
    reader_out->read = test_reader_read;
}

static ssize_t test_writer_write(void *ctx, const uint8_t *buf, size_t len)
{
    struct test_writer_config *config = (struct test_writer_config *)ctx;
    const unsigned max = config->len - config->pos;
    const unsigned to_write = len <= max ? len : max;
    memcpy(&config->buf[config->pos], buf, to_write);
    config->pos += to_write;
    return to_write;
}

void test_writer(struct test_writer_config *config, struct io_writer *writer_out)
{
    writer_out->ctx = config;
    writer_out->write = test_writer_write;
}