nucleo_f446re_playground/components/f4ll/src/ringbuffer.cpp
Attila Body 27af775a37
git subrepo pull components/f4ll
subrepo:
  subdir:   "components/f4ll"
  merged:   "3e904a2"
upstream:
  origin:   "ssh://git@codeberg.org/abody/f4ll.git"
  branch:   "master"
  commit:   "3e904a2"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"
2025-06-16 19:58:16 +02:00

150 lines
No EOL
2.8 KiB
C++

#include <f4ll/ringbuffer.h>
namespace f4ll {
ringbuffer_ext::ringbuffer_ext(uint8_t *bptr, size_type bsize)
: m_buffer(bptr),
m_bsize(bsize)
{
}
iringbuffer::size_type ringbuffer_ext::put(uint8_t const *data, size_type len)
{
size_type chunk1 = 0;
size_type chunk2 = 0;
if (!data || !len) {
return 0;
}
size_type max_len = unused();
len = len < max_len ? len : max_len;
chunk1 = m_bsize - m_head_shadow;
if (chunk1 >= len) {
chunk1 = len;
} else {
chunk2 = len - chunk1;
}
std::memcpy(m_buffer + m_head_shadow, data, chunk1);
m_head_shadow += chunk1;
if (m_head_shadow == m_bsize) {
m_head_shadow = 0;
}
if (chunk2) {
std::memcpy(m_buffer, data + chunk1, chunk2);
m_head_shadow += chunk2;
if (m_head_shadow == m_bsize) {
m_head_shadow = 0;
}
}
return len;
}
void ringbuffer_ext::commit()
{
m_head = m_head_shadow;
}
bool ringbuffer_ext::get_chunk(uint8_t const *&data, size_type &len) const
{
size_type head = m_head;
size_type tail = m_tail;
size_type chunk_size = head >= tail ? head - tail : m_bsize - tail;
if (!chunk_size) {
len = 0;
return tail != head;
}
data = m_buffer + tail;
len = chunk_size;
tail += chunk_size;
if (tail == m_bsize) {
tail = 0;
}
return tail != head;
}
void ringbuffer_ext::consumed(size_type len)
{
if (!len) {
return;
}
m_tail += len;
if (m_tail == m_bsize) {
m_tail = 0;
}
}
iringbuffer::size_type ringbuffer_ext::max_chunk_len() const
{
if (m_tail <= m_head_shadow) {
return m_bsize - m_head_shadow - (m_tail ? 0 : 1);
} else {
return m_tail - m_head_shadow - 1;
}
}
uint8_t *ringbuffer_ext::get_free_chunk(size_type &len)
{
len = max_chunk_len();
return m_buffer + m_head_shadow;
}
bool ringbuffer_ext::produced(size_type len)
{
size_type max_len = max_chunk_len();
if (len > max_len) {
return false;
}
m_head_shadow += len;
if (m_head_shadow == m_bsize) {
m_head_shadow = 0;
}
return true;
}
iringbuffer::size_type ringbuffer_ext::uncommited() const
{
return marker_diff(m_head_shadow, m_head);
}
iringbuffer::size_type ringbuffer_ext::commited() const
{
return marker_diff(m_head, m_tail);
}
void ringbuffer_ext::discard()
{
m_head_shadow = m_head;
}
iringbuffer::size_type ringbuffer_ext::size() const
{
return m_bsize;
}
iringbuffer::size_type ringbuffer_ext::used() const
{
return marker_diff(m_head_shadow, m_tail);
}
iringbuffer::size_type ringbuffer_ext::unused() const
{
return m_bsize - used() - 1;
}
iringbuffer::size_type ringbuffer_ext::marker_diff(size_type m1, size_type m2) const
{
return (m1 >= m2) ? (m1 - m2) : (m_bsize - m2 + m1);
}
//
}