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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "databuffer.h"
#include <cstdio>
FNET_DataBuffer::FNET_DataBuffer(uint32_t len)
: _bufstart(nullptr),
_bufend(nullptr),
_datapt(nullptr),
_freept(nullptr)
{
if (len > 0 && len < 256)
len = 256;
if (len > 0) {
Alloc::alloc(len).swap(_ownedBuf);
_bufstart = static_cast<char *>(_ownedBuf.get());
assert(_bufstart != nullptr);
} else { // len == 0
_bufstart = nullptr;
}
_bufend = _bufstart + len;
_datapt = _freept = _bufstart;
}
FNET_DataBuffer::FNET_DataBuffer(char *buf, uint32_t len)
: _bufstart(buf),
_bufend(buf + len),
_datapt(_bufstart),
_freept(_bufstart)
{
}
FNET_DataBuffer::~FNET_DataBuffer()
{
}
void
FNET_DataBuffer::FreeToData(uint32_t len)
{
assert(GetFreeLen() >= len);
_freept += len;
}
void
FNET_DataBuffer::DeadToData(uint32_t len)
{
assert(GetDeadLen() >= len);
_datapt -= len;
}
void
FNET_DataBuffer::DataToFree(uint32_t len)
{
assert(GetDataLen() >= len);
_freept -= len;
}
bool
FNET_DataBuffer::Shrink(uint32_t newsize)
{
const auto data_len = GetDataLen();
if (GetBufSize() <= newsize || data_len > newsize) {
return false;
}
Alloc newBuf(Alloc::alloc(newsize));
if (data_len > 0) [[likely]] {
memcpy(newBuf.get(), _datapt, data_len);
}
_ownedBuf.swap(newBuf);
_bufstart = static_cast<char *>(_ownedBuf.get());
_freept = _bufstart + data_len;
_datapt = _bufstart;
_bufend = _bufstart + newsize;
return true;
}
void
FNET_DataBuffer::Pack(uint32_t needbytes)
{
if ((GetDeadLen() + GetFreeLen()) < needbytes ||
(GetDeadLen() + GetFreeLen()) * 4 < GetDataLen())
{
uint32_t bufsize = GetBufSize() * 2;
if (bufsize < 256) {
bufsize = 256;
}
while (bufsize - GetDataLen() < needbytes)
bufsize *= 2;
Alloc newBuf(Alloc::alloc(bufsize));
if (_datapt != nullptr) [[likely]] {
memcpy(newBuf.get(), _datapt, GetDataLen());
}
_ownedBuf.swap(newBuf);
_bufstart = static_cast<char *>(_ownedBuf.get());
_freept = _bufstart + GetDataLen();
_datapt = _bufstart;
_bufend = _bufstart + bufsize;
} else {
memmove(_bufstart, _datapt, GetDataLen());
_freept = _bufstart + GetDataLen();
_datapt = _bufstart;
}
}
bool
FNET_DataBuffer::Equals(FNET_DataBuffer *other)
{
if (GetDataLen() != other->GetDataLen())
return false;
return memcmp(GetData(), other->GetData(), GetDataLen()) == 0;
}
void
FNET_DataBuffer::HexDump()
{
char *pt = _datapt;
printf("*** FNET_DataBuffer HexDump BEGIN ***\n");
uint32_t i = 0;
while (pt < _freept) {
printf("%x ", (unsigned char) *pt++);
if ((++i % 16) == 0)
printf("\n");
}
if ((i % 16) != 0)
printf("\n");
printf("*** FNET_DataBuffer HexDump END ***\n");
}
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