// FPTMemoFile.cpp : implementation of the CFPTMemoFile class
//
/////////////////////////////////////////////////////////////////////////////
/*
�����: �������� �.�.
����������: alxsoft@gazinter.net
*/
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "FPTMemoFile.h"
#include <math.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//////////////////////////////////////////////////////////////////////////
// CFPTMemoFile
IMPLEMENT_DYNAMIC(CFPTMemoFile, CMemoFile)
/* ����������� */
CFPTMemoFile::CFPTMemoFile()
{
m_nBlockSize = 64;
}
/* ���������� */
CFPTMemoFile::~CFPTMemoFile()
{
Close();
}
/* ������� ���� ���� */
void CFPTMemoFile::Create(LPCTSTR lpszName)
{
ASSERT_VALID(this);
ASSERT(lpszName != NULL);
// Re-open is invalid
if (IsOpen())
{
ASSERT(FALSE);
return;
}
TRY
{
// ��������� ���� ����
DBF_CHECK_ERROR(
CFile::Open(lpszName, CFile::modeCreate | CFile::modeReadWrite | CFile::shareExclusive), ALX_DBF_ERROR_MEMO_CREATE);
DBF_UCHAR* pFirstBlock = new DBF_UCHAR[512];
memset(pFirstBlock, 0, 512);
Write(pFirstBlock, 512);
delete[] pFirstBlock;
memset(&m_FPTHead, 0, sizeof(FPT_HEAD));
m_FPTHead.block_size = (DBF_UINT)m_nBlockSize;
m_FPTHead.next_block = (DBF_ULONG) ceil((double)512/(double)m_FPTHead.block_size);
WriteHeader();
m_bOpen = TRUE;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
Close();
}
END_CATCH
}
/* ��������� ���� ���� */
void CFPTMemoFile::Open(LPCTSTR lpszName, UINT nOpenFlag)
{
ASSERT_VALID(this);
ASSERT(lpszName != NULL);
// ��������� ��� �������� ����
nOpenFlag = nOpenFlag | CFile::typeBinary;
// Re-open is invalid
if (IsOpen())
{
ASSERT(FALSE);
return;
}
TRY
{
// ��������� ���� ����
DBF_CHECK_ERROR(
CFile::Open(lpszName, nOpenFlag), ALX_DBF_ERROR_MEMO_OPEN);
// ������ ���������
DBF_CHECK_ERROR(
ReadHeader(),ALX_DBF_ERROR_MEMO_HEAD_READ);
// ��������� ������ �����
DBF_CHECK_ERROR(m_nBlockSize > 0,ALX_DBF_ERROR_MEMO_BLOCK_SIZE);
m_bOpen = TRUE;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
Close();
}
END_CATCH
}
/* ��������� ������� */
void CFPTMemoFile::Close()
{
if(m_bOpen)
CMemoFile::Close();
}
UINT CFPTMemoFile::GetMemoFileType()
{
return MEMO_TYPE_FOXPRO;
}
/* ������ ��������� memo ����� */
BOOL CFPTMemoFile::ReadHeader()
{
ASSERT_VALID(this);
ASSERT(m_hFile != NULL);
TRY
{
Seek(0, CFile::begin);
// ������ ��������� ���� �����
if(Read(&m_FPTHead, sizeof(FPT_HEAD)) != sizeof(FPT_HEAD))
return FALSE;
m_nNextBlock = SWAP_DWORD_BYTE(m_FPTHead.next_block);
m_nBlockSize = SWAP_WORD_BYTE(m_FPTHead.block_size);
return TRUE;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
} END_CATCH
return FALSE;
}
/* ���������� ��������� ������� */
BOOL CFPTMemoFile::WriteHeader()
{
ASSERT_VALID(this);
ASSERT(m_hFile != NULL);
TRY
{
Seek(0, CFile::begin);
// ���������� ��������� ���� �����
Write(&m_FPTHead, sizeof(FPT_HEAD));
return TRUE;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
} END_CATCH
return FALSE;
}
/* ������ ���� ���� */
void CFPTMemoFile::ReadMemoRecord(DBF_ULONG lOffsetRec, DBF_LONG& nLen, CString& strMemo)
{
ASSERT_VALID(this);
ASSERT(lOffsetRec > 0);
strMemo = "";
if(!IsOpen())
return;
TRY
{
DBF_LONG nLenMemo = 0;
Seek(lOffsetRec * m_nBlockSize + sizeof(DBF_LONG),CFile::begin);
// �������� ����� ����
DBF_CHECK_ERROR(
Read(&nLenMemo, sizeof(nLenMemo)) == sizeof(DBF_LONG),
ALX_DBF_ERROR_MEMO_FIELD_READ);
nLenMemo = SWAP_DWORD_BYTE(nLenMemo);
// ��������� ����� ����
DBF_CHECK_ERROR(nLenMemo > 0,ALX_DBF_ERROR_MEMO_FIELD_READ);
char* buffer = strMemo.GetBuffer(nLenMemo + 1);
// ������ ���� ����
DBF_CHECK_ERROR(
Read(buffer, nLenMemo) == (UINT)nLenMemo,
ALX_DBF_ERROR_MEMO_FIELD_READ);
buffer[nLenMemo] = '\0';
strMemo.ReleaseBuffer(nLenMemo + 1);
nLen = nLenMemo;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
ALXThrowDBFException(ALX_DBF_ERROR_MEMO_FIELD_READ);
} END_CATCH
}
/* ������ ���� ���� */
void CFPTMemoFile::ReadMemoRecord(DBF_ULONG lOffsetRec, DBF_LONG& nLen, unsigned char** pMemoData)
{
ASSERT_VALID(this);
ASSERT(lOffsetRec > 0);
*pMemoData = NULL;
if(!IsOpen())
return;
TRY
{
DBF_LONG nLenMemo = 0;
Seek(lOffsetRec * m_nBlockSize + sizeof(DBF_LONG),CFile::begin);
// �������� ����� ����
DBF_CHECK_ERROR(
Read(&nLenMemo, sizeof(nLenMemo)) == sizeof(DBF_LONG),
ALX_DBF_ERROR_MEMO_FIELD_READ);
nLenMemo = SWAP_DWORD_BYTE(nLenMemo);
// ��������� ����� ����
DBF_CHECK_ERROR(nLenMemo > 0,ALX_DBF_ERROR_MEMO_FIELD_READ);
*pMemoData = new unsigned char[nLenMemo];
// ������ ���� ����
DBF_CHECK_ERROR(
Read(*pMemoData, nLenMemo) == (UINT)nLenMemo,
ALX_DBF_ERROR_MEMO_FIELD_READ);
nLen = nLenMemo;
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
ALXThrowDBFException(ALX_DBF_ERROR_MEMO_FIELD_READ);
} END_CATCH
}
/* ���������� � ���� ���� */
void CFPTMemoFile::WriteMemoRecord(DBF_ULONG& lOffsetRec, DBF_LONG& nLen, CString& strMemo)
{
ASSERT_VALID(this);
if(!IsOpen())
return;
TRY
{
DBF_LONG nLenMemo = 0;
// ��������� ����� ����
if(strMemo.IsEmpty())
lOffsetRec = 0;
// ���� ������ ����������
else if(lOffsetRec > 0)
{
Seek(lOffsetRec * m_nBlockSize + sizeof(DBF_LONG),CFile::begin);
// �������� ����� ����
DBF_CHECK_ERROR(
Read(&nLenMemo, sizeof(nLenMemo)) == sizeof(DBF_LONG),
ALX_DBF_ERROR_MEMO_FIELD_READ);
// �������� ������� ����� ����
nLenMemo = SWAP_DWORD_BYTE(nLenMemo);
// �������� ����������� ��������� ����� (� ������ ������������ �� ������� �����)
nLenMemo = (DBF_LONG) ceil(((double)(nLenMemo + sizeof(DBF_LONG)))/((double)m_nBlockSize)) * m_nBlockSize - sizeof(DBF_LONG);
// ���� ������ �� �������� �� �������
if(nLenMemo < strMemo.GetLength())
// ��������� ������
lOffsetRec = AddMemoRecord(strMemo);
else
// ��������� ������
UpdateMemoRecord(lOffsetRec, strMemo);
}
else
// ��������� ������
lOffsetRec = AddMemoRecord(strMemo);
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
ALXThrowDBFException(ALX_DBF_ERROR_MEMO_FIELD_WRITE);
} END_CATCH
}
/* ��������� memo ���� */
DBF_LONG CFPTMemoFile::AddMemoRecord(CString& strMemo)
{
// ����� ������
DBF_ULONG lOffsetRec = 0;
TRY
{
DBF_LONG nSign = MF_TEXTREC;
DBF_LONG nLenMemo = strMemo.GetLength();
ReadHeader();
lOffsetRec = m_nNextBlock;
m_nNextBlock += (DBF_LONG) ceil((double)(nLenMemo + sizeof(nSign)) / (double)m_nBlockSize);
m_FPTHead.next_block = SWAP_DWORD_BYTE(m_nNextBlock);
Seek(lOffsetRec * m_nBlockSize,CFile::begin);
// ���������� ��������� �����
nSign = SWAP_DWORD_BYTE(nSign); // ������ � ������������ ����
Write(&nSign, sizeof(nSign));
// ���������� ����� ������
nLenMemo = SWAP_DWORD_BYTE(nLenMemo); // ������ � ������������ ����
Write(&nLenMemo, sizeof(nLenMemo));
// ���������� ������
Write((LPCSTR)strMemo, strMemo.GetLength());
WriteHeader();
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
} END_CATCH
return lOffsetRec;
}
/* �������������� memo ���� */
void CFPTMemoFile::UpdateMemoRecord(DBF_ULONG lOffsetRec, CString& strMemo)
{
TRY
{
DBF_LONG nLenMemo = strMemo.GetLength();
Seek(lOffsetRec * m_nBlockSize + sizeof(DBF_LONG),CFile::begin);
// ���������� ����� ������
nLenMemo = SWAP_DWORD_BYTE(nLenMemo); // ������ � ������������ ����
Write(&nLenMemo, sizeof(nLenMemo));
// ���������� ������
Write((LPCSTR)strMemo, strMemo.GetLength());
}
CATCH(CFileException, e)
{
e->ReportError();
e->Delete();
} END_CATCH
}
#ifdef _DEBUG
void CFPTMemoFile::AssertValid() const
{
CMemoFile::AssertValid();
}
void CFPTMemoFile::Dump(CDumpContext& dc) const
{
ASSERT_VALID(this);
CMemoFile::Dump(dc);
dc << "m_nNextBlock = " << m_nNextBlock;
dc << "m_nBlockSize = " << m_nBlockSize;
dc << "\n";
}
#endif //_DEBUG