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/*
* This file is part of the libopencm3_cpp_extensions project.
* hosted at http://github.com/thirdpin/libopencm3_cpp_extensions
*
* Copyright (C) 2016 Third Pin LLC
* Written by Pavel Larionov <p.larionov@thirdpin.ru>
* Written by Anastasiia Lazareva <a.lazareva@thirdpin.ru>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
ROUND BUFFER implementation, public interface
*/
#include "round_buffer.h"
namespace cm3cpp {
namespace utils {
RoundBuffer::RoundBuffer()
{
init(ROUND_BUFFER_DEFAULT_SIZE);
}
RoundBuffer::RoundBuffer(uint32_t size)
{
init(size);
}
uint32_t RoundBuffer::get(void* buffer, uint32_t index, uint32_t count)
{
uint32_t cnt = get_count();
uint32_t cnt_out = ((count + index) <= cnt) ? (count + index) : cnt;
for (uint32_t i = index; i < cnt_out; i++)
((uint8_t*)buffer)[i - index] = (*this)[i];
return (cnt_out);
}
bool RoundBuffer::push(void* buffer, uint32_t count)
{
bool result = true;
for (uint32_t i = 0; i < count; i++)
result = push(((uint8_t*)buffer)[i]);
return result;
}
bool RoundBuffer::push(RoundBuffer* buffer, uint32_t count, bool withPop)
{
bool result = true;
uint32_t max_size = buffer->get_count();
max_size = ((max_size < count) ? max_size : count);
if (max_size > 0) {
if (withPop) {
for (uint32_t i = 0; i < max_size; i++)
result = push(buffer->pop());
}
else {
for (uint32_t i = 0; i < max_size; i++)
result = push(buffer->operator[](i));
}
}
return result;
}
uint32_t RoundBuffer::pop(void* buffer, uint32_t count)
{
uint32_t cnt = get_count();
uint32_t cnt_out = (count <= cnt) ? count : cnt;
for (uint32_t i = 0; i < cnt_out; i++)
((uint8_t*)buffer)[i] = pop();
return (cnt_out);
}
uint32_t RoundBuffer::pop(uint32_t count)
{
uint32_t cnt = get_count();
uint32_t cnt_out = (count <= cnt) ? count : cnt;
for (uint32_t i = 0; i < cnt_out; i++)
pop();
return (cnt_out);
}
int RoundBuffer::memcmp(void* buffer, uint32_t sizebuf)
{
uint8_t* buf = (uint8_t*)buffer;
unsigned int cnt = get_count();
if (!cnt || !sizebuf || (sizebuf > cnt))
return (-1);
uint32_t i = 0;
while (i < sizebuf && buf[i] == (*this)[i])
i++;
if (i == sizebuf)
return (0); //???????
return (i + 1);
}
int RoundBuffer::mem_search(void* buffer, uint32_t sizebuf)
{
uint32_t cnt = get_count();
if (cnt < sizebuf)
return (-1);
uint8_t* pbuf = (uint8_t*)buffer;
for (uint32_t i_begin = 0; i_begin <= (cnt - sizebuf); i_begin++) {
uint32_t i_word;
uint8_t byte;
for (i_word = 0; i_word < sizebuf; i_word++) {
byte = (*this)[i_begin + i_word];
if (byte != pbuf[i_word]) {
if (i_word != 0)
i_word = 0;
break;
}
}
if (i_word == sizebuf)
return (i_begin);
}
return (-2);
}
} // namespace utils
} // namespace cm3cpp
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