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/*
Miranda Database Tool
Copyright (C) 2001-2005 Richard Hughes
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "..\commonheaders.h"
int CDb3Base::SignatureValid(DWORD ofs, DWORD signature)
{
if (ofs + sizeof(DWORD) >= sourceFileSize) {
cb->pfnAddLogMessage(STATUS_ERROR, TranslateT("Invalid offset found (database truncated?)"));
return 0;
}
DWORD sig = *(DWORD*)(m_pDbCache + ofs);
return sig == signature;
}
int CDb3Base::PeekSegment(DWORD ofs, PVOID buf, int cbBytes)
{
if (ofs >= sourceFileSize) {
cb->pfnAddLogMessage(STATUS_ERROR, TranslateT("Invalid offset found"));
return ERROR_SEEK;
}
DWORD bytesRead;
if (ofs + cbBytes > sourceFileSize)
bytesRead = sourceFileSize - ofs;
else
bytesRead = cbBytes;
if (bytesRead == 0) {
cb->pfnAddLogMessage(STATUS_ERROR, TranslateT("Error reading, database truncated? (%u)"), GetLastError());
return ERROR_READ_FAULT;
}
CopyMemory(buf, m_pDbCache + ofs, bytesRead);
if ((int)bytesRead<cbBytes) return ERROR_HANDLE_EOF;
return ERROR_SUCCESS;
}
int CDb3Base::ReadSegment(DWORD ofs, PVOID buf, int cbBytes)
{
int ret = PeekSegment(ofs, buf, cbBytes);
if (ret != ERROR_SUCCESS && ret != ERROR_HANDLE_EOF) return ret;
if (cb->bAggressive) {
if (ofs + cbBytes > sourceFileSize) {
cb->pfnAddLogMessage(STATUS_WARNING, TranslateT("Can't write to working file, aggressive mode may be too aggressive now"));
ZeroMemory(m_pDbCache + ofs, sourceFileSize - ofs);
}
else ZeroMemory(m_pDbCache + ofs, cbBytes);
}
cb->spaceProcessed += cbBytes;
return ERROR_SUCCESS;
}
DWORD CDb3Base::WriteSegment(DWORD ofs, PVOID buf, int cbBytes)
{
DWORD bytesWritten;
if (cb->bCheckOnly) return 0xbfbfbfbf;
if (ofs == WSOFS_END) {
ofs = m_dbHeader.ofsFileEnd;
m_dbHeader.ofsFileEnd += cbBytes;
}
SetFilePointer(cb->hOutFile, ofs, NULL, FILE_BEGIN);
WriteFile(cb->hOutFile, buf, cbBytes, &bytesWritten, NULL);
if ((int)bytesWritten < cbBytes) {
cb->pfnAddLogMessage(STATUS_FATAL, TranslateT("Can't write to output file - disk full? (%u)"), GetLastError());
return WS_ERROR;
}
return ofs;
}
int CDb3Base::ReadWrittenSegment(DWORD ofs, PVOID buf, int cbBytes)
{
DWORD bytesRead;
if (cb->bCheckOnly) return 0xbfbfbfbf;
if (ofs + cbBytes > m_dbHeader.ofsFileEnd)
return ERROR_SEEK;
SetFilePointer(cb->hOutFile, ofs, NULL, FILE_BEGIN);
ReadFile(cb->hOutFile, buf, cbBytes, &bytesRead, NULL);
if ((int)bytesRead < cbBytes)
return ERROR_READ_FAULT;
return ERROR_SUCCESS;
}
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