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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "zcbuf.h"
#include <cstdlib>
#include <cstring>
namespace search::diskindex {
ZcBuf::ZcBuf()
: _valI(nullptr),
_valE(nullptr),
_mallocStart(nullptr),
_mallocSize(0)
{
}
ZcBuf::~ZcBuf()
{
free(_mallocStart);
}
void
ZcBuf::clearReserve(size_t reserveSize)
{
if (reserveSize + zcSlack() > _mallocSize) {
size_t newSize = _mallocSize * 2;
if (newSize < 16) {
newSize = 16;
}
while (newSize < reserveSize + zcSlack()) {
newSize *= 2;
}
uint8_t *newBuf = static_cast<uint8_t *>(malloc(newSize));
free(_mallocStart);
_mallocStart = newBuf;
_mallocSize = newSize;
}
_valE = _mallocStart + _mallocSize - zcSlack();
_valI = _mallocStart;
}
void
ZcBuf::expand()
{
size_t newSize = _mallocSize * 2;
size_t oldSize = size();
if (newSize < 16) {
newSize = 16;
}
uint8_t *newBuf = static_cast<uint8_t *>(malloc(newSize));
if (oldSize > 0) {
memcpy(newBuf, _mallocStart, oldSize);
}
free(_mallocStart);
_mallocStart = newBuf;
_mallocSize = newSize;
_valI = _mallocStart + oldSize;
_valE = _mallocStart + newSize - zcSlack();
}
}
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