scummvm/engines/wintermute/base/base_dynamic_buffer.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

/*
 * This file is based on WME Lite.
 * http://dead-code.org/redir.php?target=wmelite
 * Copyright (c) 2011 Jan Nedoma
 */

#include "engines/wintermute/base/base_engine.h"
#include "engines/wintermute/base/base_dynamic_buffer.h"

namespace Wintermute {

//////////////////////////////////////////////////////////////////////////
BaseDynamicBuffer::BaseDynamicBuffer(BaseGame *inGame, uint32 initSize, uint32 growBy) {
	_buffer = nullptr;
	_size = 0;
	_realSize = 0;

	_offset = 0;
	_initSize = initSize;
	_growBy = growBy;

	_initialized = false;
}


//////////////////////////////////////////////////////////////////////////
BaseDynamicBuffer::~BaseDynamicBuffer() {
	cleanup();
}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::cleanup() {
	if (_buffer) {
		free(_buffer);
	}
	_buffer = nullptr;
	_size = 0;
	_realSize = 0;
	_offset = 0;
	_initialized = false;
}


//////////////////////////////////////////////////////////////////////////
uint32 BaseDynamicBuffer::getSize() const {
	return _size;
}


//////////////////////////////////////////////////////////////////////////
bool BaseDynamicBuffer::init(uint32 initSize) {
	cleanup();

	if (initSize == 0) {
		initSize = _initSize;
	}

	_buffer = (byte *)malloc(initSize);
	if (!_buffer) {
		BaseEngine::LOG(0, "BaseDynamicBuffer::Init - Error allocating %d bytes", initSize);
		return STATUS_FAILED;
	}

	_realSize = initSize;
	_initialized = true;

	return STATUS_OK;
}


//////////////////////////////////////////////////////////////////////////
bool BaseDynamicBuffer::putBytes(const byte *buffer, uint32 size) {
	if (!_initialized) {
		init();
	}

	while (_offset + size > _realSize) {
		_realSize += _growBy;
		_buffer = (byte *)realloc(_buffer, _realSize);
		if (!_buffer) {
			BaseEngine::LOG(0, "BaseDynamicBuffer::PutBytes - Error reallocating buffer to %d bytes", _realSize);
			return STATUS_FAILED;
		}
	}

	memcpy(_buffer + _offset, buffer, size);
	_offset += size;
	_size += size;

	return STATUS_OK;
}


//////////////////////////////////////////////////////////////////////////
bool BaseDynamicBuffer::getBytes(byte *buffer, uint32 size) {
	if (!_initialized) {
		init();
	}

	if (_offset + size > _size) {
		BaseEngine::LOG(0, "BaseDynamicBuffer::GetBytes - Buffer underflow");
		return STATUS_FAILED;
	}

	memcpy(buffer, _buffer + _offset, size);
	_offset += size;

	return STATUS_OK;
}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::putDWORD(uint32 val) {
	putBytes((byte *)&val, sizeof(uint32));
}


//////////////////////////////////////////////////////////////////////////
uint32 BaseDynamicBuffer::getDWORD() {
	uint32 ret;
	getBytes((byte *)&ret, sizeof(uint32));
	return ret;
}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::putString(const char *val) {
	if (!val) {
		putString("(null)");
	} else {
		putDWORD(strlen(val) + 1);
		putBytes((const byte *)val, strlen(val) + 1);
	}
}


//////////////////////////////////////////////////////////////////////////
char *BaseDynamicBuffer::getString() {
	uint32 len = getDWORD();
	char *ret = (char *)(_buffer + _offset);
	_offset += len;

	if (!strcmp(ret, "(null)")) {
		return nullptr;
	} else {
		return ret;
	}
}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::putText(const char *fmt, ...) {
	va_list va;

	va_start(va, fmt);
	putTextForm(fmt, va);
	va_end(va);

}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::putTextIndent(int indent, const char *fmt, ...) {
	va_list va;

	putText("%*s", indent, "");

	va_start(va, fmt);
	putTextForm(fmt, va);
	va_end(va);
}


//////////////////////////////////////////////////////////////////////////
void BaseDynamicBuffer::putTextForm(const char *format, va_list argptr) {
	char buff[32768];
	vsprintf(buff, format, argptr);
	putBytes((byte *)buff, strlen(buff));
}

} // end of namespace Wintermute