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py/ringbuf: Implement put_bytes/get_bytes functions.

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glenn20 2023-04-28 00:19:31 +10:00 committed by Damien George
parent a39e2827b7
commit 9d735d1be7
2 changed files with 50 additions and 0 deletions
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47
py/ringbuf.c
View File

@ -23,6 +23,9 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "ringbuf.h"
int ringbuf_get16(ringbuf_t *r) {
@ -71,3 +74,47 @@ int ringbuf_put16(ringbuf_t *r, uint16_t v) {
r->iput = iput_b;
return 0;
}
// Returns:
// 0: Success
// -1: Not enough data available to complete read (try again later)
// -2: Requested read is larger than buffer - will never succeed
int ringbuf_get_bytes(ringbuf_t *r, uint8_t *data, size_t data_len) {
if (ringbuf_avail(r) < data_len) {
return (r->size <= data_len) ? -2 : -1;
}
uint32_t iget = r->iget;
uint32_t iget_a = (iget + data_len) % r->size;
uint8_t *datap = data;
if (iget_a < iget) {
// Copy part of the data from the space left at the end of the buffer
memcpy(datap, r->buf + iget, r->size - iget);
datap += (r->size - iget);
iget = 0;
}
memcpy(datap, r->buf + iget, iget_a - iget);
r->iget = iget_a;
return 0;
}
// Returns:
// 0: Success
// -1: Not enough free space available to complete write (try again later)
// -2: Requested write is larger than buffer - will never succeed
int ringbuf_put_bytes(ringbuf_t *r, const uint8_t *data, size_t data_len) {
if (ringbuf_free(r) < data_len) {
return (r->size <= data_len) ? -2 : -1;
}
uint32_t iput = r->iput;
uint32_t iput_a = (iput + data_len) % r->size;
const uint8_t *datap = data;
if (iput_a < iput) {
// Copy part of the data to the end of the buffer
memcpy(r->buf + iput, datap, r->size - iput);
datap += (r->size - iput);
iput = 0;
}
memcpy(r->buf + iput, datap, iput_a - iput);
r->iput = iput_a;
return 0;
}

3
py/ringbuf.h
View File

@ -96,4 +96,7 @@ int ringbuf_get16(ringbuf_t *r);
int ringbuf_peek16(ringbuf_t *r);
int ringbuf_put16(ringbuf_t *r, uint16_t v);
int ringbuf_get_bytes(ringbuf_t *r, uint8_t *data, size_t data_len);
int ringbuf_put_bytes(ringbuf_t *r, const uint8_t *data, size_t data_len);
#endif // MICROPY_INCLUDED_PY_RINGBUF_H