mirror of
https://github.com/FirebirdSQL/firebird.git
synced 2025-01-24 21:23:04 +01:00
92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/*
|
|
* The contents of this file are subject to the Initial
|
|
* Developer's Public License Version 1.0 (the "License");
|
|
* you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
|
|
*
|
|
* Software distributed under the License is distributed AS IS,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing rights
|
|
* and limitations under the License.
|
|
*
|
|
* The Original Code was created by Claudio Valderrama on 25-Feb-2007
|
|
* for the Firebird Open Source RDBMS project.
|
|
*
|
|
* Copyright (c) 2007 Claudio Valderrama
|
|
* and all contributors signed below.
|
|
*
|
|
* All Rights Reserved.
|
|
* Contributor(s): ______________________________________.
|
|
*
|
|
*/
|
|
|
|
#ifndef FB_EXTENDER_H
|
|
#define FB_EXTENDER_H
|
|
|
|
// Helper class for the bulk insertion tricks.
|
|
// It does automatic resource management
|
|
// and appends starting with newline when there's anything already in the buffer.
|
|
// Calling alloc() again with a bigger buffer size simply forgets the old data.
|
|
// Calling alloc() always resets the usage counter to zero, hence the first
|
|
// call to append() after alloc() always work as a simple copy.
|
|
// Using the object is only valid after the first append() call.
|
|
// This class can be used with binary data that includes the null terminator,
|
|
// although it was designed for text (see the newline inserted by append()).
|
|
// It only puts the null terminator on allocation; no warranties getBuffer()
|
|
// will return a null terminated string unless append() received it.
|
|
|
|
#include <memory.h>
|
|
|
|
class Extender
|
|
{
|
|
public:
|
|
Extender();
|
|
~Extender();
|
|
void alloc(size_t n);
|
|
void allocFill(size_t n, char c);
|
|
size_t append(const char* s, size_t s_size, bool newline = true);
|
|
char* getBuffer();
|
|
const char* getBuffer() const;
|
|
size_t getUsed() const;
|
|
protected:
|
|
void grow(size_t n);
|
|
private:
|
|
char* m_buf;
|
|
size_t m_size;
|
|
char* m_pos;
|
|
};
|
|
|
|
|
|
inline Extender::Extender()
|
|
: m_buf(0), m_size(0), m_pos(0)
|
|
{
|
|
}
|
|
|
|
inline Extender::~Extender()
|
|
{
|
|
delete[] m_buf;
|
|
}
|
|
|
|
inline char* Extender::getBuffer()
|
|
{
|
|
return m_buf;
|
|
}
|
|
|
|
// Probably won't be used as I can't imagine a const Extender object except
|
|
// when passed to another function as const param with content already stored.
|
|
inline const char* Extender::getBuffer() const
|
|
{
|
|
return m_buf;
|
|
}
|
|
|
|
// It uses the current insertion point to calculate an offset from the base address.
|
|
// This is in turn the number of effective bytes in use from the whole allocation.
|
|
inline size_t Extender::getUsed() const
|
|
{
|
|
return m_pos - m_buf;
|
|
}
|
|
|
|
#endif // FB_EXTENDER_H
|
|
|