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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QDATABUFFER_P_H
#define QDATABUFFER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qtguiglobal_p.h>
#include "QtCore/qbytearray.h"
#include <stdlib.h>
QT_BEGIN_NAMESPACE
template <typename Type> class QDataBuffer
{
Q_DISABLE_COPY_MOVE(QDataBuffer)
public:
explicit QDataBuffer(qsizetype res)
{
capacity = res;
if (res) {
QT_WARNING_PUSH
QT_WARNING_DISABLE_GCC("-Walloc-size-larger-than=")
buffer = (Type*) malloc(capacity * sizeof(Type));
QT_WARNING_POP
Q_CHECK_PTR(buffer);
} else {
buffer = nullptr;
}
siz = 0;
}
~QDataBuffer()
{
if (buffer)
free(buffer);
}
inline void reset() { siz = 0; }
inline bool isEmpty() const { return siz==0; }
qsizetype size() const { return siz; }
inline Type *data() const { return buffer; }
Type &at(qsizetype i) { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
const Type &at(qsizetype i) const { Q_ASSERT(i >= 0 && i < siz); return buffer[i]; }
inline Type &last() { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
inline const Type &last() const { Q_ASSERT(!isEmpty()); return buffer[siz-1]; }
inline Type &first() { Q_ASSERT(!isEmpty()); return buffer[0]; }
inline const Type &first() const { Q_ASSERT(!isEmpty()); return buffer[0]; }
inline void add(const Type &t) {
reserve(siz + 1);
buffer[siz] = t;
++siz;
}
inline void pop_back() {
Q_ASSERT(siz > 0);
--siz;
}
void resize(qsizetype size) {
reserve(size);
siz = size;
}
void reserve(qsizetype size) {
if (size > capacity) {
if (capacity == 0)
capacity = 1;
while (capacity < size)
capacity *= 2;
buffer = (Type*) realloc(static_cast<void*>(buffer), capacity * sizeof(Type));
Q_CHECK_PTR(buffer);
}
}
void shrink(qsizetype size) {
Q_ASSERT(capacity >= size);
capacity = size;
if (size) {
buffer = (Type*) realloc(static_cast<void*>(buffer), capacity * sizeof(Type));
Q_CHECK_PTR(buffer);
siz = std::min(siz, size);
} else {
free(buffer);
buffer = nullptr;
siz = 0;
}
}
inline void swap(QDataBuffer<Type> &other) {
qSwap(capacity, other.capacity);
qSwap(siz, other.siz);
qSwap(buffer, other.buffer);
}
inline QDataBuffer &operator<<(const Type &t) { add(t); return *this; }
private:
qsizetype capacity;
qsizetype siz;
Type *buffer;
};
QT_END_NAMESPACE
#endif // QDATABUFFER_P_H
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