AppleWin/source/Util_MemoryTextFile.cpp

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#include "StdAfx.h"
#pragma hdrstop
// MemoryTextFile _________________________________________________________________________________
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const int EOL_NULL = 0;
//===========================================================================
bool MemoryTextFile_t::Read( char *pFileName )
{
bool bStatus = false;
FILE *hFile = fopen( pFileName, "rt" );
if (hFile)
{
fseek( hFile, 0, SEEK_END );
long nSize = ftell( hFile );
fseek( hFile, 0, SEEK_SET );
m_vBuffer.reserve( nSize + 1 );
m_vBuffer.insert( m_vBuffer.begin(), nSize+1, 0 );
char *pBuffer = & m_vBuffer.at(0);
fread( (void*)pBuffer, nSize, 1, hFile );
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m_vBuffer.push_back( EOL_NULL );
fclose(hFile);
m_bDirty = true;
GetLinePointers();
bStatus = true;
}
return bStatus;
}
//===========================================================================
void MemoryTextFile_t::GetLine( const int iLine, char *pLine, const int nMaxLineChars )
{
if (m_bDirty)
{
GetLinePointers();
}
ZeroMemory( pLine, nMaxLineChars );
strncpy( pLine, m_vLines[ iLine ], nMaxLineChars-1 );
}
// cr/new lines are converted into null, string terminators
//===========================================================================
void MemoryTextFile_t::GetLinePointers()
{
if (! m_bDirty)
return;
m_vLines.erase( m_vLines.begin(), m_vLines.end() );
char *pBegin = & m_vBuffer.at( 0 );
char *pLast = & m_vBuffer[ m_vBuffer.size() ];
char *pEnd = NULL;
char *pStartNextLine;
while (pBegin < pLast)
{
m_vLines.push_back( pBegin );
pEnd = const_cast<char*>( SkipUntilEOL( pBegin ));
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if (*pEnd == EOL_NULL)
{
// Found EOL via null
pStartNextLine = pEnd + 1;
}
else
{
pStartNextLine = const_cast<char*>( EatEOL( pEnd ));
// DOS/Win "Text" mode converts LF CR (0D 0A) to CR (0D)
// but just in case, the file is read in binary.
int nEOL = pStartNextLine - pEnd;
while (nEOL-- > 1)
{
*pEnd++ = ' ';
}
// assert( pEnd != NULL );
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*pEnd = EOL_NULL;
}
pBegin = pStartNextLine;
}
m_bDirty = false;
}
//===========================================================================
void MemoryTextFile_t::PushLine( char *pLine )
{
char *pSrc = pLine;
while (pSrc && *pSrc)
{
if (*pSrc == CHAR_CR)
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m_vBuffer.push_back( EOL_NULL );
else
if (*pSrc == CHAR_LF)
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m_vBuffer.push_back( EOL_NULL );
else
m_vBuffer.push_back( *pSrc );
pSrc++;
}
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m_vBuffer.push_back( EOL_NULL );
m_bDirty = true;
}