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130 lines
2.7 KiB
C++
130 lines
2.7 KiB
C++
#include "Utilities/simple_ringbuf.h"
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simple_ringbuf::simple_ringbuf(u32 size)
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{
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set_buf_size(size);
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}
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simple_ringbuf::simple_ringbuf(simple_ringbuf&& other)
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{
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rw_ptr = other.rw_ptr.load();
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buf_size = other.buf_size;
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buf = std::move(other.buf);
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initialized = other.initialized.observe();
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other.buf_size = 0;
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other.rw_ptr = 0;
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other.initialized = false;
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}
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simple_ringbuf& simple_ringbuf::operator=(simple_ringbuf&& other)
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{
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if (this == &other) return *this;
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rw_ptr = other.rw_ptr.load();
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buf_size = other.buf_size;
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buf = std::move(other.buf);
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initialized = other.initialized.observe();
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other.buf_size = 0;
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other.rw_ptr = 0;
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other.initialized = false;
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return *this;
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}
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u32 simple_ringbuf::get_free_size() const
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{
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const u64 _rw_ptr = rw_ptr;
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const u32 rd = static_cast<u32>(_rw_ptr);
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const u32 wr = static_cast<u32>(_rw_ptr >> 32);
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return wr >= rd ? buf_size - 1 - (wr - rd) : rd - wr - 1U;
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}
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u32 simple_ringbuf::get_used_size() const
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{
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return buf_size - 1 - get_free_size();
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}
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u32 simple_ringbuf::get_total_size() const
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{
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return buf_size;
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}
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void simple_ringbuf::set_buf_size(u32 size)
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{
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ensure(size);
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this->buf_size = size + 1;
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buf = std::make_unique<u8[]>(this->buf_size);
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flush();
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initialized = true;
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}
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void simple_ringbuf::flush()
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{
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rw_ptr.atomic_op([&](u64 &val)
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{
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val = static_cast<u32>(val >> 32) | (val & 0xFFFFFFFF'00000000);
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});
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}
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u32 simple_ringbuf::push(const void *data, u32 size)
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{
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ensure(data != nullptr && initialized.observe());
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const u32 old = static_cast<u32>(rw_ptr.load() >> 32);
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const u32 to_push = std::min(size, get_free_size());
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auto b_data = static_cast<const u8*>(data);
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if (!to_push) return 0;
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if (old + to_push > buf_size)
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{
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const auto first_write_sz = buf_size - old;
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memcpy(&buf[old], b_data, first_write_sz);
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memcpy(&buf[0], b_data + first_write_sz, to_push - first_write_sz);
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}
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else
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{
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memcpy(&buf[old], b_data, to_push);
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}
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rw_ptr.atomic_op([&](u64 &val)
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{
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val = static_cast<u64>((old + to_push) % buf_size) << 32 | static_cast<u32>(val);
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});
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return to_push;
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}
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u32 simple_ringbuf::pop(void *data, u32 size)
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{
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ensure(data != nullptr && initialized.observe());
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const u32 old = static_cast<u32>(rw_ptr.load());
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const u32 to_pop = std::min(size, get_used_size());
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u8 *b_data = static_cast<u8*>(data);
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if (!to_pop) return 0;
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if (old + to_pop > buf_size)
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{
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const auto first_read_sz = buf_size - old;
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memcpy(b_data, &buf[old], first_read_sz);
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memcpy(b_data + first_read_sz, &buf[0], to_pop - first_read_sz);
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}
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else
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{
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memcpy(b_data, &buf[old], to_pop);
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}
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rw_ptr.atomic_op([&](u64 &val)
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{
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val = (old + to_pop) % buf_size | (val & 0xFFFFFFFF'00000000);
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});
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return to_pop;
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}
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