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Refactor ring buffer (add external buffer version)

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This commit is contained in:
Attila Body 2025-06-11 13:13:12 +02:00
parent a4c1baa410
commit b2eee97903
Signed by: abody
GPG key ID: BD0C6214E68FB5CF
3 changed files with 143 additions and 112 deletions
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126
inc/f4ll/ringbuffer.h
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@ -72,10 +72,11 @@ public:
virtual size_type unused() const = 0;
};
template <iringbuffer::size_type SZ> class ringbuffer : public iringbuffer
//
class ringbuffer_ext : public iringbuffer
{
public:
ringbuffer() = default;
ringbuffer_ext(uint8_t *bptr, size_type bsize);
size_type put(uint8_t const *data, size_type len) override;
void commit() override;
@ -89,7 +90,8 @@ public:
size_type unused() const override;
private:
uint8_t m_buffer[SZ]; //!< Data bufer
uint8_t *m_buffer; //!< Data bufer
size_type const m_bsize; //!< Data buffer size
size_type m_head = 0; //!< Write position
size_type m_head_shadow = 0; //!< Shadowed write position for collecting data
//!< before committing it
@ -99,120 +101,20 @@ private:
};
//
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::put(uint8_t const *data, size_type len)
template <iringbuffer::size_type SZ> class ringbuffer : public ringbuffer_ext
{
size_type chunk1 = 0;
size_type chunk2 = 0;
public:
ringbuffer();
if (!data || !len) {
return 0;
}
size_type max_len = unused();
len = len < max_len ? len : max_len;
chunk1 = sizeof(m_buffer) - 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 == sizeof(m_buffer)) {
m_head_shadow = 0;
}
if (chunk2) {
std::memcpy(m_buffer, data + chunk1, chunk2);
m_head_shadow += chunk2;
if (m_head_shadow == sizeof(m_buffer)) {
m_head_shadow = 0;
}
}
return len;
}
template <iringbuffer::size_type SZ> void ringbuffer<SZ>::commit()
{
m_head = m_head_shadow;
private:
uint8_t m_buffer[SZ];
};
template <iringbuffer::size_type SZ> bool ringbuffer<SZ>::get_chunk(size_type len_requested, uint8_t const *&data, size_type &len) const
//
template <iringbuffer::size_type SZ>
ringbuffer<SZ>::ringbuffer()
: ringbuffer_ext(m_buffer, SZ)
{
if (!len_requested) {
return false;
}
size_type head = m_head;
size_type tail = m_tail;
size_type chunk_size = head >= tail ? head - tail : sizeof(m_buffer) - tail;
if (!chunk_size) {
len = 0;
return false;
}
if (chunk_size > len_requested) {
chunk_size = len_requested;
}
data = m_buffer + tail;
len = chunk_size;
tail += chunk_size;
if (tail == sizeof(m_buffer)) {
tail = 0;
}
return tail != head;
}
template <iringbuffer::size_type SZ> void ringbuffer<SZ>::consumed(size_type len)
{
if (!len) {
return;
}
m_tail += len;
if (m_tail == sizeof(m_buffer)) {
m_tail = 0;
}
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::uncommited() const
{
return marker_diff(m_head_shadow, m_head);
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::commited() const
{
return marker_diff(m_head, m_tail);
}
template <iringbuffer::size_type SZ> void ringbuffer<SZ>::discard()
{
m_head_shadow = m_head;
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::size() const
{
return SZ;
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::used() const
{
return marker_diff(m_head_shadow, m_tail);
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::unused() const
{
return SZ - used() - 1;
}
template <iringbuffer::size_type SZ> iringbuffer::size_type ringbuffer<SZ>::marker_diff(size_type m1, size_type m2) const
{
return (m1 >= m2) ? (m1 - m2) : (SZ - m2 + m1);
}
} // namespace f1ll