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diff --git a/src/compareDlg.cpp b/src/compareDlg.cpp
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+/* $Id: compareDlg.cpp,v 1.9 2008-09-11 01:49:00 salem Exp $
+ * This file is part of lfhex.
+ * Copyright (C) 2006 Salem Ganzhorn <eyekode@yahoo.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <QLabel>
+#include <QLineEdit>
+#include <QCheckBox>
+#include <qlayout.h>
+#include <qpushbutton.h>
+#include <QToolBar>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QApplication>
+#include <qcombobox.h>
+#include <qtabwidget.h>
+#include <QBitmap>
+#include <QVBoxLayout>
+#include <QMenuBar>
+
+#include "compareDlg.hpp"
+#include "offsetConstraint.hpp"
+#include "hexGui.hpp"
+#include "reader.hpp"
+#include "box.hpp"
+
+// icon images:
+#include "img/prev.xbm"
+#include "img/next.xbm"
+#include "img/last.xbm"
+#include "img/first.xbm"
+#include "img/exit.xbm"
+
+//extern QApplication * qApp;
+
+CompareDlg::CompareDlg(const char *file0,
+ const char *file1,
+ QWidget*parent)
+ : QMainWindow(parent)
+{
+ tabLayout = new QTabWidget(this);
+ setCentralWidget(tabLayout);
+
+ QWidget *options = new QWidget(tabLayout);
+ QVBoxLayout *optionLayout = new QVBoxLayout(options);
+
+ optionLayout->setMargin(3);
+ optionLayout->setSpacing(2);
+
+ // setup alignment entries:
+ offsetConstraint = new OffsetConstraint(options);
+ offsetConstraint->setTitle( "Constrain offset to X*n+Y" );
+ optionLayout->addWidget(offsetConstraint);
+ // setup cursor offsets
+ diffOffsets = new QCheckBox("Allow different file offsets",options);
+ optionLayout->addWidget(diffOffsets);
+ // add a dummy strechable widget for alignment.
+ optionLayout->addStretch(1);
+ connect(diffOffsets,SIGNAL(stateChanged(int)),
+ this,SLOT(setAllowDiffOffsets(int)));
+ diffOffsets->setChecked(false);
+ setAllowDiffOffsets(false);
+
+ // setup menu
+ QMenu* fileMenu = menuBar()->addMenu("File");
+ fileMenu->addAction( QBitmap::fromData(QSize(exit_width,exit_height),
+ exit_bits),"Exit",qApp,SLOT(quit()));
+
+
+ // setup toolbar
+ QToolBar *tools = new QToolBar(this);
+
+ tools->addAction(QBitmap::fromData(QSize(first_width,first_height),first_bits),
+ "First Difference",this,SLOT(first()));
+ tools->addAction(QBitmap::fromData(QSize(prev_width,prev_height),prev_bits),
+ "Previous Difference", this,SLOT(prev()));
+ tools->addAction(QBitmap::fromData(QSize(next_width,next_height),next_bits),
+ "Next Difference", this,SLOT(next()));
+ tools->addAction(QBitmap::fromData(QSize(last_width,last_height),last_bits),
+ "Last Difference", this,SLOT(last()));
+
+ // setup compare section
+ QWidget *view = new QWidget(tabLayout);
+ QVBoxLayout *layout = new QVBoxLayout(view);
+
+ hexGui[0] = new HexGui(view);
+ hexGui[1] = new HexGui(view);
+ reader[0] = hexGui[0]->reader();
+ reader[1] = hexGui[1]->reader();
+
+ if( file0 )
+ hexGui[0]->open(file0);
+ if( file1 )
+ hexGui[1]->open(file1);
+
+ layout->addWidget(hexGui[0]);
+ layout->addWidget(hexGui[1]);
+ hexGui[0]->setWindowFlags(Qt::SubWindow);
+ hexGui[1]->setWindowFlags(Qt::SubWindow);
+
+
+ tabLayout->addTab(view,"&Compare");
+ tabLayout->addTab(options,"&Options");
+ addToolBar(tools);
+ // request a size large enough for both hexEditors
+ resize(500,500);
+ setWindowTitle("Compare dialog");
+}
+
+bool CompareDlg::enabled()
+{
+ if( reader[0]->is_open() && reader[1]->is_open() ) {
+ // check to see if modified!!!
+ if( hexGui[0]->isModified() || hexGui[1]->isModified() ) {
+ QMessageBox::critical(this,PROGRAM_STRING,
+ "Error, cannot use comparison"
+ " functions on modified buffers.");
+ return false;
+ }
+ return true;
+ }
+
+ return false;
+}
+// public slots
+void CompareDlg::setAllowDiffOffsets(int state)
+{
+ diffOffsets->setChecked(state);
+}
+
+bool CompareDlg::first()
+{
+ if( !enabled() )
+ return false;
+
+ // see Compare::last() for description of concept
+ off_t offset = offsetConstraint->next(0);
+ hexGui[0]->gotoOffset(offset);
+ hexGui[1]->gotoOffset(offset);
+ if( prev() )
+ return true;
+ hexGui[0]->gotoOffset(0);
+ hexGui[1]->gotoOffset(0);
+ return next();
+}
+
+bool CompareDlg::last()
+{
+ if( !enabled() )
+ return false;
+
+ // look at lastidx 's previous's next range
+ // prev(x) is garranteed to not contain x, and next(prev(x)) will contain x
+ off_t min_size_decr = min( reader[0]->size()-1,
+ reader[1]->size()-1 );
+ off_t offset = offsetConstraint->prev( min_size_decr );
+ hexGui[0]->gotoOffset(offset);
+ hexGui[1]->gotoOffset(offset);
+ if( next() )
+ return true;
+ hexGui[0]->gotoOffset( min_size_decr );
+ hexGui[1]->gotoOffset( min_size_decr );
+ return prev();
+}
+
+bool CompareDlg::prev()
+{
+ if( !enabled() )
+ return false;;
+ // find previous diff
+ off_t offset[2];
+ offset[0] = hexGui[0]->offset();
+ offset[1] = (diffOffsets->isChecked()) ? hexGui[1]->offset() : offset[0];
+
+ if( offsetConstraint->getStride() > 1 ) {
+ off_t stop[2];
+ off_t pos[2];
+ for( pos[0] = offset[0] = offsetConstraint->prev(offset[0]),
+ pos[1] = offset[1] = offsetConstraint->prev(offset[1]);
+ offset[0] >= 0 && offset[1] >= 0;
+ pos[0] = offset[0] = offsetConstraint->prev(offset[0]),
+ pos[1] = offset[1] = offsetConstraint->prev(offset[1])) {
+
+ // calculate stop
+ stop[0] = offset[0]+offsetConstraint->getStride();
+ stop[1] = offset[1]+offsetConstraint->getStride();
+
+ // ignore lookups on less than a full stride length
+ // this would only happen if the file size is less than the stride
+ if( stop[0] > reader[0]->size() || stop[1] > reader[1]->size() )
+ return false;
+
+ while( pos[0] < stop[0] ) {
+ if( (*reader[0])[pos[0]++] != (*reader[1])[pos[1]++] ) {
+ // we have a difference
+ hexGui[0]->setSelection(offset[0],stop[0]);
+ hexGui[1]->setSelection(offset[1],stop[1]);
+ hexGui[0]->gotoOffset(offset[0]);
+ hexGui[1]->gotoOffset(offset[1]);
+ return true;
+ }
+ }
+ }
+ } else {
+ // just go one char at a time
+
+ // make sure we are not past the eof of the second buffer
+ if( offset[1] >= reader[1]->size() )
+ return false;
+ if( offset[0] <= 0 || offset[1] <= 0 )
+ return false;
+ do {
+ offset[0]--;
+ offset[1]--;
+
+ if( (*reader[0])[offset[0]] != (*reader[1])[offset[1]] ) {
+ hexGui[0]->gotoOffset(offset[0]);
+ hexGui[1]->gotoOffset(offset[1]);
+ hexGui[0]->setSelection(offset[0],offset[0]+1);
+ hexGui[1]->setSelection(offset[1],offset[1]+1);
+ return true;
+ }
+ } while( offset[0] > 0 && offset[1] > 0 );
+ }
+ return false;
+}
+
+bool CompareDlg::next()
+{
+ // find next diff
+ if( !enabled() )
+ return false;
+
+ off_t offset[2];
+ offset[0] = hexGui[0]->offset();
+ offset[1] = (diffOffsets->isChecked()) ? hexGui[1]->offset() : offset[0];
+
+ off_t size[2];
+ size[0] = reader[0]->size();
+ size[1] = reader[1]->size();
+
+ if( offsetConstraint->getStride() > 1 ) {
+ off_t stop[2];
+ off_t pos[2];
+ for( pos[0] = offset[0] = offsetConstraint->next(offset[0]),
+ pos[1] = offset[1] = offsetConstraint->next(offset[1]);
+ offset[0] < size[0] && offset[1] < size[1];
+ pos[0] = offset[0] = offsetConstraint->next( offset[0] ),
+ pos[1] = offset[1] = offsetConstraint->next( offset[1] )) {
+ // compare from offset to offset+stride()
+ stop[0] = offset[0]+offsetConstraint->getStride();
+ stop[1] = offset[1]+offsetConstraint->getStride();
+ // if this will go past the bounds of the files, then the difference
+ // does not matter, ignore it.
+ if( stop[0] > size[0] || stop[1] > size[1] ) {
+ return false;
+ }
+
+ while( pos[0] < stop[0] ) {
+ if( (*reader[0])[pos[0]++] != (*reader[1])[pos[1]++] ) {
+ // we have a difference
+ hexGui[0]->setSelection(offset[0],stop[0]);
+ hexGui[1]->setSelection(offset[1],stop[1]);
+ hexGui[0]->gotoOffset(offset[0]);
+ hexGui[1]->gotoOffset(offset[1]);
+ return true; // bail out of fn
+ }
+ }
+ }
+ } else {
+ // just go one at a time
+ if( offset[0] >= size[0] || offset[1] >= size[1] )
+ return false;
+ if( offset[0] < 0 || offset[1] < 0 )
+ return false;
+ offset[0]++;
+ offset[1]++;
+ while( offset[0] < size[0] && offset[1] < size[1] ) {
+ // don't compare the one we are on
+ if( (*reader[0])[offset[0]] != (*reader[1])[offset[1]] ) {
+ hexGui[0]->gotoOffset(offset[0]);
+ hexGui[1]->gotoOffset(offset[1]);
+ hexGui[0]->setSelection(offset[0],offset[0]+1);
+ hexGui[1]->setSelection(offset[1],offset[1]+1);
+ return true;
+ }
+ offset[0]++;
+ offset[1]++;
+ }
+ }
+ return false;
+}
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