646c7e13ea
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44250 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
292 lines
8.4 KiB
C++
292 lines
8.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: src/common/textfile.cpp
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// Purpose: implementation of wxTextFile class
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 03.04.98
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// headers
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// ============================================================================
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif //__BORLANDC__
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#if !wxUSE_FILE || !wxUSE_TEXTBUFFER
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#undef wxUSE_TEXTFILE
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#define wxUSE_TEXTFILE 0
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#endif // wxUSE_FILE
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#if wxUSE_TEXTFILE
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#ifndef WX_PRECOMP
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#include "wx/string.h"
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#include "wx/intl.h"
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#include "wx/file.h"
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#include "wx/log.h"
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#endif
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#include "wx/textfile.h"
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#include "wx/filename.h"
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#include "wx/buffer.h"
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// ============================================================================
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// wxTextFile class implementation
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// ============================================================================
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wxTextFile::wxTextFile(const wxString& strFileName)
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: wxTextBuffer(strFileName)
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{
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}
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// ----------------------------------------------------------------------------
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// file operations
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// ----------------------------------------------------------------------------
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bool wxTextFile::OnExists() const
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{
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return wxFile::Exists(m_strBufferName);
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}
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bool wxTextFile::OnOpen(const wxString &strBufferName, wxTextBufferOpenMode OpenMode)
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{
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wxFile::OpenMode FileOpenMode;
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switch ( OpenMode )
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{
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default:
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wxFAIL_MSG( _T("unknown open mode in wxTextFile::Open") );
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// fall through
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case ReadAccess :
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FileOpenMode = wxFile::read;
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break;
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case WriteAccess :
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FileOpenMode = wxFile::write;
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break;
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}
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return m_file.Open(strBufferName.c_str(), FileOpenMode);
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}
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bool wxTextFile::OnClose()
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{
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return m_file.Close();
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}
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bool wxTextFile::OnRead(const wxMBConv& conv)
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{
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// file should be opened
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wxASSERT_MSG( m_file.IsOpened(), _T("can't read closed file") );
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// read the entire file in memory: this is not the most efficient thing to
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// do but there is no good way to avoid it in Unicode build because if we
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// read the file block by block we can't convert each block to Unicode
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// separately (the last multibyte char in the block might be only partially
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// read and so the conversion would fail) and, as the file contents is kept
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// in memory by wxTextFile anyhow, it shouldn't be a big problem to read
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// the file entirely
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size_t bufSize = 0,
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bufPos = 0;
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char block[1024];
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wxCharBuffer buf;
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// first determine if the file is seekable or not and so whether we can
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// determine its length in advance
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wxFileOffset fileLength;
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{
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wxLogNull logNull;
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fileLength = m_file.Length();
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}
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// some non-seekable files under /proc under Linux pretend that they're
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// seekable but always return 0; others do return an error
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const bool seekable = fileLength != wxInvalidOffset && fileLength != 0;
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if ( seekable )
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{
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// we know the required length, so set the buffer size in advance
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bufSize = fileLength;
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if ( !buf.extend(bufSize - 1 /* it adds 1 internally */) )
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return false;
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// if the file is seekable, also check that we're at its beginning
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wxASSERT_MSG( m_file.Tell() == 0, _T("should be at start of file") );
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}
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for ( ;; )
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{
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ssize_t nRead = m_file.Read(block, WXSIZEOF(block));
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if ( nRead == wxInvalidOffset )
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{
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// read error (error message already given in wxFile::Read)
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return false;
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}
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if ( nRead == 0 )
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{
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// if no bytes have been read, presumably this is a valid-but-empty file
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if ( bufPos == 0 )
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return true;
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// otherwise we've finished reading the file
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break;
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}
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if ( seekable )
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{
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// this shouldn't happen but don't overwrite the buffer if it does
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wxCHECK_MSG( bufPos + nRead <= bufSize, false,
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_T("read more than file length?") );
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}
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else // !seekable
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{
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// for non-seekable files we have to allocate more memory on the go
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if ( !buf.extend(bufPos + nRead - 1 /* it adds 1 internally */) )
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return false;
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}
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// append to the buffer
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memcpy(buf.data() + bufPos, block, nRead);
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bufPos += nRead;
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}
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if ( !seekable )
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{
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bufSize = bufPos;
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}
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const wxString str(buf, conv, bufPos);
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// there's no risk of this happening in ANSI build
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#if wxUSE_UNICODE
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if ( bufSize > 4 && str.empty() )
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{
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wxLogError(_("Failed to convert file \"%s\" to Unicode."), GetName());
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return false;
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}
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#endif // wxUSE_UNICODE
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free(buf.release()); // we don't need this memory any more
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// now break the buffer in lines
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// last processed character, we need to know if it was a CR or not
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wxChar chLast = '\0';
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// the beginning of the current line, changes inside the loop
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wxString::const_iterator lineStart = str.begin();
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const wxString::const_iterator end = str.end();
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for ( wxString::const_iterator p = lineStart; p != end; p++ )
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{
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const wxChar ch = *p;
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switch ( ch )
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{
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case '\n':
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// could be a DOS or Unix EOL
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if ( chLast == '\r' )
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{
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if ( p - 1 >= lineStart )
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{
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AddLine(wxString(lineStart, p - 1), wxTextFileType_Dos);
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}
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else
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{
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// there were two line endings, so add an empty line:
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AddLine(wxEmptyString, wxTextFileType_Dos);
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}
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}
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else // bare '\n', Unix style
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{
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AddLine(wxString(lineStart, p), wxTextFileType_Unix);
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}
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lineStart = p + 1;
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break;
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case '\r':
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if ( chLast == '\r' )
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{
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// Mac empty line
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AddLine(wxEmptyString, wxTextFileType_Mac);
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lineStart = p + 1;
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}
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//else: we don't know what this is yet -- could be a Mac EOL or
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// start of DOS EOL so wait for next char
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break;
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default:
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if ( chLast == '\r' )
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{
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// Mac line termination
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if ( p - 1 >= lineStart )
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{
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AddLine(wxString(lineStart, p - 1), wxTextFileType_Mac);
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}
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else
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{
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// there were two line endings, so add an empty line:
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AddLine(wxEmptyString, wxTextFileType_Mac);
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}
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lineStart = p;
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}
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}
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chLast = ch;
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}
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// anything in the last line?
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if ( lineStart != end )
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{
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// add unterminated last line
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AddLine(wxString(lineStart, end), wxTextFileType_None);
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}
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return true;
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}
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bool wxTextFile::OnWrite(wxTextFileType typeNew, const wxMBConv& conv)
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{
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wxFileName fn = m_strBufferName;
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// We do NOT want wxPATH_NORM_CASE here, or the case will not
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// be preserved.
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if ( !fn.IsAbsolute() )
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fn.Normalize(wxPATH_NORM_ENV_VARS | wxPATH_NORM_DOTS | wxPATH_NORM_TILDE |
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wxPATH_NORM_ABSOLUTE | wxPATH_NORM_LONG);
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wxTempFile fileTmp(fn.GetFullPath());
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if ( !fileTmp.IsOpened() ) {
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wxLogError(_("can't write buffer '%s' to disk."), m_strBufferName.c_str());
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return false;
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}
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size_t nCount = GetLineCount();
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for ( size_t n = 0; n < nCount; n++ ) {
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fileTmp.Write(GetLine(n) +
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GetEOL(typeNew == wxTextFileType_None ? GetLineType(n)
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: typeNew),
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conv);
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}
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// replace the old file with this one
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return fileTmp.Commit();
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}
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#endif // wxUSE_TEXTFILE
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