Enable graphics context by default

[wxWidgets.git] / src / common / textfile.cpp

diff --git a/src/common/textfile.cpp b/src/common/textfile.cpp
index 28593b36f56ccaf63747891ffea36435c7e12106..79d837f6319ccc8e87ee574410c795b78c29b8cc 100644 (file)
--- a/src/common/textfile.cpp
+++ b/src/common/textfile.cpp
@@ -13,10 +13,6 @@
 // headers
 // ============================================================================
 
 // headers
 // ============================================================================
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "textfile.h"
-#endif
-

 #include  "wx/wxprec.h"
 
 #ifdef    __BORLANDC__
 #include  "wx/wxprec.h"
 
 #ifdef    __BORLANDC__


@@ -39,6 +35,7 @@
 
 #include "wx/textfile.h"
 #include "wx/filename.h"
 
 #include "wx/textfile.h"
 #include "wx/filename.h"

+#include "wx/buffer.h"

 
 // ============================================================================
 // wxTextFile class implementation
 
 // ============================================================================
 // wxTextFile class implementation


@@ -89,98 +86,205 @@ bool wxTextFile::OnClose()
 }
 
 
 }
 
 

-bool wxTextFile::OnRead(wxMBConv& conv)
+bool wxTextFile::OnRead(const wxMBConv& conv)

 {
 {

-    // file should be opened and we must be in it's beginning
-    wxASSERT( m_file.IsOpened() && m_file.Tell() == 0 );
+    // file should be opened
+    wxASSERT_MSG( m_file.IsOpened(), _T("can't read closed file") );
+
+    // read the entire file in memory: this is not the most efficient thing to
+    // do it but there is no good way to avoid it in Unicode build because if
+    // we read the file block by block we can't convert each block to Unicode
+    // separately (the last multibyte char in the block might be only partially
+    // read and so the conversion would fail) and, as the file contents is kept
+    // in memory by wxTextFile anyhow, it shouldn't be a big problem to read
+    // the file entirely
+    size_t bufSize = 0;
+
+    // number of bytes to (try to) read from disk at once
+    static const size_t BLOCK_SIZE = 4096;
+
+    wxCharBuffer buf;
+
+    // first determine if the file is seekable or not and so whether we can
+    // determine its length in advance
+    wxFileOffset fileLength;
+    {
+        wxLogNull logNull;
+        fileLength = m_file.Length();
+    }

 
 

-    char *strBuf, *strPtr, *strEnd;
-    char ch, chLast = '\0';
-    char buf[1024];
-    int n, nRead;
+    // some non-seekable files under /proc under Linux pretend that they're
+    // seekable but always return 0; others do return an error
+    const bool seekable = fileLength != wxInvalidOffset && fileLength != 0;
+    if ( seekable )
+    {
+        // we know the required length, so set the buffer size in advance
+        bufSize = fileLength;
+        if ( !buf.extend(bufSize) )
+            return false;

 
 

-    strPtr = strBuf = new char[1024];
-    strEnd = strBuf + 1024;
+        // if the file is seekable, also check that we're at its beginning
+        wxASSERT_MSG( m_file.Tell() == 0, _T("should be at start of file") );

 
 

-    do 
-    {
-        nRead = m_file.Read(buf, WXSIZEOF(buf));
-        if ( nRead == wxInvalidOffset ) 
+        char *dst = buf.data();
+        for ( size_t nRemaining = bufSize; nRemaining > 0; )

         {
         {

-            // read error (error message already given in wxFile::Read)
-            delete[] strBuf;
-            return FALSE;
+            size_t nToRead = BLOCK_SIZE;
+
+            // the file size could have changed, avoid overflowing the buffer
+            // even if it did
+            if ( nToRead > nRemaining )
+                nToRead = nRemaining;
+
+            ssize_t nRead = m_file.Read(dst, nToRead);
+
+            if ( nRead == wxInvalidOffset )
+            {
+                // read error (error message already given in wxFile::Read)
+                return false;
+            }
+
+            if ( nRead == 0 )
+            {
+                // this file can't be empty because we checked for this above
+                // so this must be the end of file
+                break;
+            }
+
+            dst += nRead;
+            nRemaining -= nRead;

         }
 
         }
 

-        for (n = 0; n < nRead; n++)
+        wxASSERT_MSG( dst - buf.data() == (wxFileOffset)bufSize,
+                      _T("logic error") );
+    }
+    else // file is not seekable
+    {
+        char block[BLOCK_SIZE];
+        for ( ;; )

         {
         {

-            ch = buf[n];
-            switch ( ch ) 
+            ssize_t nRead = m_file.Read(block, WXSIZEOF(block));
+
+            if ( nRead == wxInvalidOffset )

             {
             {

-                case '\n':
-                    // Dos/Unix line termination
-                    *strPtr = '\0';
-                    AddLine(wxString(strBuf, conv), 
-                            chLast == '\r' ? wxTextFileType_Dos
-                                           : wxTextFileType_Unix);
-                    strPtr = strBuf;
-                    chLast = '\n';
-                    break;
-
-                case '\r':
-                    if ( chLast == '\r' ) 
+                // read error (error message already given in wxFile::Read)
+                return false;
+            }
+
+            if ( nRead == 0 )
+            {
+                // if no bytes have been read, presumably this is a
+                // valid-but-empty file
+                if ( bufSize == 0 )
+                    return true;
+
+                // otherwise we've finished reading the file
+                break;
+            }
+
+            // extend the buffer for new data
+            if ( !buf.extend(bufSize + nRead) )
+                return false;
+
+            // and append it to the buffer
+            memcpy(buf.data() + bufSize, block, nRead);
+            bufSize += nRead;
+        }
+    }
+
+    const wxString str(buf, conv, bufSize);
+
+    // there's no risk of this happening in ANSI build
+#if wxUSE_UNICODE
+    if ( bufSize > 4 && str.empty() )
+    {
+        wxLogError(_("Failed to convert file \"%s\" to Unicode."), GetName());
+        return false;
+    }
+#endif // wxUSE_UNICODE
+
+    // we don't need this memory any more
+    buf.reset();
+
+
+    // now break the buffer in lines
+
+    // last processed character, we need to know if it was a CR or not
+    wxChar chLast = '\0';
+
+    // the beginning of the current line, changes inside the loop
+    wxString::const_iterator lineStart = str.begin();
+    const wxString::const_iterator end = str.end();
+    for ( wxString::const_iterator p = lineStart; p != end; p++ )
+    {
+        const wxChar ch = *p;
+        switch ( ch )
+        {
+            case '\n':
+                // could be a DOS or Unix EOL
+                if ( chLast == '\r' )
+                {
+                    if ( p - 1 >= lineStart )

                     {
                     {

-                        // Mac empty line
-                        AddLine(wxEmptyString, wxTextFileType_Mac);
+                        AddLine(wxString(lineStart, p - 1), wxTextFileType_Dos);

                     }
                     else
                     }
                     else

-                        chLast = '\r';
-                    break;
-
-                default:
-                    if ( chLast == '\r' )

                     {
                     {

-                        // Mac line termination
-                        *strPtr = '\0';
-                        AddLine(wxString(strBuf, conv), wxTextFileType_Mac);
-                        chLast = ch;
-                        strPtr = strBuf;
-                        *(strPtr++) = ch;
+                        // there were two line endings, so add an empty line:
+                        AddLine(wxEmptyString, wxTextFileType_Dos);

                     }
                     }

-                    else 
+                }
+                else // bare '\n', Unix style
+                {
+                    AddLine(wxString(lineStart, p), wxTextFileType_Unix);
+                }
+
+                lineStart = p + 1;
+                break;
+
+            case '\r':
+                if ( chLast == '\r' )
+                {
+                    // Mac empty line
+                    AddLine(wxEmptyString, wxTextFileType_Mac);
+                    lineStart = p + 1;
+                }
+                //else: we don't know what this is yet -- could be a Mac EOL or
+                //      start of DOS EOL so wait for next char
+                break;
+
+            default:
+                if ( chLast == '\r' )
+                {
+                    // Mac line termination
+                    if ( p - 1 >= lineStart )

                     {
                     {

-                        // add to the current line
-                        *(strPtr++) = ch;
-                        if ( strPtr == strEnd )
-                        {
-                            // we must allocate more memory
-                            size_t size = strEnd - strBuf;
-                            char *newBuf = new char[size + 1024];
-                            memcpy(newBuf, strBuf, size);
-                            delete[] strBuf;
-                            strBuf = newBuf;
-                            strEnd = strBuf + size + 1024;
-                            strPtr = strBuf + size;
-                        }
+                        AddLine(wxString(lineStart, p - 1), wxTextFileType_Mac);

                     }
                     }

-            }
+                    else
+                    {
+                        // there were two line endings, so add an empty line:
+                        AddLine(wxEmptyString, wxTextFileType_Mac);
+                    }
+                    lineStart = p;
+                }

         }
         }

-    } while ( nRead == WXSIZEOF(buf) );
+
+        chLast = ch;
+    }

 
     // anything in the last line?
 
     // anything in the last line?

-    if ( strPtr != strBuf ) 
+    if ( lineStart != end )

     {
     {

-        *strPtr = '\0';
-        AddLine(wxString(strBuf, conv), 
-                wxTextFileType_None); // no line terminator
+        // add unterminated last line
+        AddLine(wxString(lineStart, end), wxTextFileType_None);

     }
 
     }
 

-    delete[] strBuf;
-    return TRUE;
+    return true;

 }
 
 
 }
 
 

-bool wxTextFile::OnWrite(wxTextFileType typeNew, wxMBConv& conv)
+bool wxTextFile::OnWrite(wxTextFileType typeNew, const wxMBConv& conv)

 {
     wxFileName fn = m_strBufferName;
 
 {
     wxFileName fn = m_strBufferName;
 


@@ -194,7 +298,7 @@ bool wxTextFile::OnWrite(wxTextFileType typeNew, wxMBConv& conv)
 
     if ( !fileTmp.IsOpened() ) {
         wxLogError(_("can't write buffer '%s' to disk."), m_strBufferName.c_str());
 
     if ( !fileTmp.IsOpened() ) {
         wxLogError(_("can't write buffer '%s' to disk."), m_strBufferName.c_str());

-        return FALSE;
+        return false;

     }
 
     size_t nCount = GetLineCount();
     }
 
     size_t nCount = GetLineCount();


@@ -210,4 +314,3 @@ bool wxTextFile::OnWrite(wxTextFileType typeNew, wxMBConv& conv)
 }
 
 #endif // wxUSE_TEXTFILE
 }
 
 #endif // wxUSE_TEXTFILE

-