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188 | //
// This file is part of the aMule Project.
//
// Copyright (c) 2003-2011 aMule Team ( admin@amule.org / http://www.amule.org )
// Copyright (c) 2002-2011 Merkur ( devs@emule-project.net / http://www.emule-project.net )
//
// Any parts of this program derived from the xMule, lMule or eMule project,
// or contributed by third-party developers are copyrighted by their
// respective authors.
//
// 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 St, Fifth Floor, Boston, MA 02110-1301, USA
//
#include "MemFile.h" // Interface declarations
CMemFile::CMemFile(unsigned int growthRate)
{
m_buffer = NULL;
m_BufferSize = 0;
m_fileSize = 0;
m_growthRate = growthRate;
m_position = 0;
m_delete = true;
m_readonly = false;
}
CMemFile::CMemFile(uint8* buffer, size_t bufferSize)
{
MULE_VALIDATE_PARAMS(buffer, wxT("CMemFile: Attempted to attach invalid buffer."));
m_buffer = buffer;
m_BufferSize = bufferSize;
m_fileSize = bufferSize;
m_growthRate = 0;
m_position = 0;
m_delete = false;
m_readonly = false;
}
CMemFile::CMemFile(const uint8* buffer, size_t bufferSize)
{
MULE_VALIDATE_PARAMS(buffer, wxT("CMemFile: Attempted to attach invalid buffer."));
m_buffer = const_cast<uint8*>(buffer);
m_BufferSize = bufferSize;
m_fileSize = bufferSize;
m_growthRate = 0;
m_position = 0;
m_delete = false;
m_readonly = true;
}
CMemFile::~CMemFile()
{
if (m_delete) {
free(m_buffer);
}
}
uint64 CMemFile::GetPosition() const
{
return m_position;
}
void CMemFile::SetLength(size_t newLen)
{
MULE_VALIDATE_STATE(!m_readonly, wxT("CMemFile: Attempted to change length on a read-only buffer."));
if (newLen > m_BufferSize) {
enlargeBuffer(newLen);
}
if (newLen < m_position) {
m_position = newLen;
}
m_fileSize = newLen;
}
uint64 CMemFile::GetLength() const
{
return m_fileSize;
}
void CMemFile::enlargeBuffer(size_t size)
{
MULE_VALIDATE_PARAMS(size >= m_BufferSize, wxT("CMemFile: Attempted to shrink buffer."));
MULE_VALIDATE_STATE(m_delete, wxT("CMemFile: Attempted to grow an attached buffer."));
MULE_VALIDATE_STATE(!m_readonly, wxT("CMemFile: Attempted to grow a read-only buffer."));
size_t newsize;
if (m_growthRate) {
newsize = ((size + m_growthRate - 1) / m_growthRate) * m_growthRate;
} else {
// No growth-rate specified. Change to exactly the size specified.
newsize = size;
}
uint8 *tmp = (uint8*)realloc(m_buffer, newsize);<--- C-style pointer casting [+]C-style pointer casting detected. C++ offers four different kinds of casts as replacements: static_cast, const_cast, dynamic_cast and reinterpret_cast. A C-style cast could evaluate to any of those automatically, thus it is considered safer if the programmer explicitly states which kind of cast is expected.
if (tmp) {
m_buffer = tmp;
m_BufferSize = newsize;
}
MULE_VALIDATE_STATE(tmp, wxT("CMemFile: Failed to (re)allocate buffer"));
}
sint64 CMemFile::doRead(void* buffer, size_t count) const
{
MULE_VALIDATE_PARAMS(buffer, wxT("CMemFile: Attempting to read to invalid buffer"));
// Handle reads past EOF
if (m_position > m_fileSize) {
return 0;
} else if (m_position + count > m_fileSize) {
count = m_fileSize - m_position;
}
if (count) {
memcpy(buffer, m_buffer + m_position, count);
m_position += count;
}
return count;
}
sint64 CMemFile::doWrite(const void* buffer, size_t count)
{
MULE_VALIDATE_PARAMS(buffer, wxT("CMemFile: Attempting to write to invalid buffer"));
MULE_VALIDATE_STATE(!m_readonly, wxT("CMemFile: Attempted to write to a read-only buffer."));
// Needs more space?
if (m_position + count > m_BufferSize) {
enlargeBuffer(m_position + count);
}
MULE_VALIDATE_STATE(m_position + count <= m_BufferSize, wxT("CMemFile: Buffer not resized to needed size."));
memcpy(m_buffer + m_position, buffer, count);
m_position += count;
if (m_position > m_fileSize) {
m_fileSize = m_position;
}
return count;
}
sint64 CMemFile::doSeek(sint64 offset) const
{
MULE_VALIDATE_PARAMS(offset >= 0, wxT("CMemFile: Invalid seek, position, must be positive."));
return m_position = offset;
}
void CMemFile::ResetData()
{
wxCHECK_RET(!m_readonly, wxT("Trying to reset read-only buffer"));
memset(m_buffer, 0, m_BufferSize);
m_fileSize = 0;
m_position = 0;
}
// File_checked_for_headers
|