115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
// ############################################################################
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// INCLUDES
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#include "pch.hpp"
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#include "ccsv.h"
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#include "debug.h"
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// ############################################################################
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// DEFINES
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#define chComma ','
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#define chNewline '\n'
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#define chReturn '\r'
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// ############################################################################
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//
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// CCSVFile - simple file i/o for CSV files
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//
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CCSVFile::CCSVFile()
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{
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m_hFile = 0;
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m_iLastRead = 0;
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m_pchLast = m_pchBuf = NULL;
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}
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// ############################################################################
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CCSVFile::~CCSVFile()
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{
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AssertMsg(!m_hFile,"CCSV file is still open");
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}
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// ############################################################################
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BOOLEAN CCSVFile::Open(LPCTSTR pszFileName)
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{
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AssertMsg(!m_hFile, "a file is already open.");
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m_hFile = CreateFile((LPCTSTR)pszFileName,
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GENERIC_READ, FILE_SHARE_READ,
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0, OPEN_EXISTING, 0, 0);
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if (INVALID_HANDLE_VALUE == m_hFile)
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{
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return FALSE;
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}
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m_pchLast = m_pchBuf = NULL;
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return TRUE;
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}
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// ############################################################################
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BOOLEAN CCSVFile::ReadToken(LPTSTR psz, DWORD cbMax)
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{
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LPTSTR pszLast;
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int ch;
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ch = ChNext();
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if (-1 == ch)
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{
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return FALSE;
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}
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pszLast = psz + (cbMax - 1);
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while (psz < pszLast && chComma != ch && chNewline != ch && -1 != ch)
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{
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*psz++ = (TCHAR)ch;
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ch = ChNext(); //Read in the next character
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}
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*psz++ = '\0';
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return TRUE;
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}
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// ############################################################################
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void CCSVFile::Close(void)
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{
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if (m_hFile)
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CloseHandle(m_hFile);
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#ifdef DEBUG
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if (!m_hFile) TraceMsg(TF_GENERAL, "CCSVFile::Close was called, but m_hFile was already 0\n");
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#endif
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m_hFile = 0;
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}
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// ############################################################################
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BOOL CCSVFile::FReadInBuffer(void)
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{
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//Read another buffer
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#ifdef WIN16
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if ((m_cchAvail = _read(m_hFile, m_rgchBuf, CCSVFILE_BUFFER_SIZE)) <= 0)
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return FALSE;
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#else
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if (!ReadFile(m_hFile, m_rgchBuf, CCSVFILE_BUFFER_SIZE, &m_cchAvail, NULL) || !m_cchAvail)
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{
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return FALSE; //nothing more to read
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}
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#endif
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m_pchBuf = m_rgchBuf;
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m_pchLast = m_pchBuf + m_cchAvail;
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return TRUE; //success
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}
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// ############################################################################
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inline int CCSVFile::ChNext(void)
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{
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LNextChar:
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if (m_pchBuf >= m_pchLast && !FReadInBuffer()) //implies that we finished reading the buffer. Read in some more.
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return -1; //nothing more to read
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m_iLastRead = *m_pchBuf++;
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if (chReturn == m_iLastRead)
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goto LNextChar; //faster to NOT make extra function call
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return m_iLastRead;
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}
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