# The &khexedit; Handbook

Jonathan
Singer

    jsinger@leeta.net

Espen
Sand

    espensa@online.no

Developer
Lauri
Watts

    lauri@kde.org

Reviewer
1999-2000
Jonathan Singer
&FDLNotice;
2001-07-06
0.08.05

&khexedit; is a hexadecimal editor for the &kde; environment.

KDE
Kapp
edit
binary
hexadecimal

## Introduction

&khexedit; is an editor for the raw data of binary files. It includes find/replace functions, bookmarks, many configuration options, drag and drop support and other powerful features.

## Starting &khexedit;

Type ``khexedit`` at a command prompt or select Binary Editor from the Utilities group in the KDE start menu.

The standard &Qt; and &kde; command line options are available, and can be listed by entering ``khexedit` `--help``.

Other command line options are:

`<file>` - open the specfied file

`--offset` <offset> jump to position <offset> in the opened file.

## &khexedit; In A Nutshell

The main &khexedit; window has the following components: menubar, toolbar, offset column, data editor window, text field, searchbar, conversion field and status bar.

&khexedit; Screen
&khexedit; Screen

When a document is opened, the bytes are displayed in hexadecimal format in the data editor window. The data can be edited, cut, copied, pasted, dragged and dropped much as text is in an text editor or word processor. A cursor marks the current position. Pressing the Insert key toggles between overwrite and insert text entry modes. The data can also be displayed as octal, binary or decimal values, by choosing the desired format in the View menu.

The offset column on the left indicates the position of a particular byte in the file. The text field on the right displays the ASCII encoding of the file. The cursor position and edits in the data editor window are reflected in the text field. The text field can also be edited, and those changes are reflected in the data editor window.

The searchbar allows the user to search for a specific value -- hexadecimal, octal, binary, decimal or text.

The conversion field displays the value of the byte at the cursor position in a variety of bases. It also displays the value of all standard data types starting at the cursor.

Multiple documents can be open at the same time but only one can be active. Use the Documents menu to select which document will be active.

## Menu Commands

Note that most menu commands also have a keyboard shortcut.

### File Menu

&Ctrl;N File New

  Open a new file.

&Ctrl;O File Open...

  Open an existing file.

&Ctrl;I File Insert...

  Insert an exiting file in the current document.

File Open Recent

  Choose from a list of the last opened files.

File Revert

  Return edited document to the last saved state.

&Ctrl;S File Save

  Save document.

File Save As...

  Save document with a new name.

&Ctrl;W File Close

  Close the current document.

&Ctrl;P File Print...

  Print the current document.

File Export...

  Export the selected document or a portion of it.

  Opens a dialog box with these options:

  Format

    Plain text, HTML table, rich text format, C array. Use the Options tab to select details for a C array or an HTML table.

  Destination

    The file to which the data will be exported

  Export Range

    Selects which data will be exported -- the entire document, the selected portion or the range between two specified offsets.

File Cancel Operation

  Stop the current operation

File Permissions

  Set write privileges:

  Read only

    When set, changes may not be made to the displayed file.

  Allow Resize

    When off, individual bytes may be edited but the total number of bytes may not be changed.

File New Window

  Open an additional &khexedit; window

File Close Window

  Close the current &khexedit; window

&Ctrl;Q File Quit

  Close all &khexedit; windows

### Edit Menu

&Ctrl;Z Edit Undo

  Undo the last action.

&Ctrl;&Shift;Z Edit Redo

  Redo the last undone action.

&Ctrl;X Edit Cut

  Delete the selected bytes and copy them to the clipboard.

&Ctrl;C Edit Copy

  Copy the selected bytes to the clipboard.

&Ctrl;V Edit Paste

  Insert the cut or copied bytes in the clipboard.

Edit Special

  Variations on Copy and Paste:

  - Copy as Text: Copies the selected bytes as ASCII characters.

  - Paste into New File.

  - Paste into new window.

&Ctrl;A Edit Select All

  Select entire document.

Edit Unselect

  Unselect entire document.

&Ctrl;F Edit Find...

  Find a specified pattern in the document. Hexadecimal,decimal, octal, binary or text patterns can be searched for.

  Options in the dialog box allow you to specify the starting point, direction and range of the search.

F3 Edit Find Next

  Find the next instance of the Find pattern.

&Shift;F3 Edit Find Previous

  Find the previous instance of the Find pattern.

&Ctrl;R Edit Replace...

  Replace the find pattern with a different pattern.

&Ctrl;G Edit Goto Offset...

  Move the cursor to a specified offset.

&Ctrl;Ins Edit Insert Pattern...

  Insert a specified string of bytes.

  Options in the dialog box allow you to specify the length of the pattern, its format (hexadecimal, decimal, octal, binary or text) and the insertion point.

  If Repeat pattern is checked, the specified pattern will be inserted repeatedly to reach the length set in Size.

### View Menu

View Hexadecimal View Decimal View Octal View Binary View Text

  The first five choices select the format displayed in the data editor window: hexadecimal, decimal, octal, binary or text. When text display is selected, the extra text field is not displayed.

View Show Offset Column

  Toggles display of offset column on and off.

View Show Text Field

  Toggles display of text field on and off.

View Offset as Decimal

  When set, all offsets are displayed and interpreted as decimal numbers rather than as hexadecimals.

View Upper Case (Data)

  When set, hexadecimal digits in the data are displayed in upper case.

View Upper Case (Offset)

  When set, hexadecimal digits in the offset value are displayed in upper case.

View Document Encoding

  Select the encoding used for display in the text field. Alternative encodings like EBCDIC and 7-bit ASCII can be used. Additional encodings can be added by the user (not implemented yet.)

### Bookmarks Menu

&Ctrl;B Bookmarks Add Bookmark

  Bookmark a location within the document.

  Multiple bookmarks can be set for a single document. Each document has its own set of bookmarks and the appropriate set is displayed at the bottom of the Bookmarks menu when a document is selected. Choose a bookmark from the menu to go to it.

&Ctrl;E Bookmarks Replace Bookmark

  Reset an existing bookmark to the current cursor location. A dialog will be opened with the list of available bookmarks; select the one you wish to change.

&Ctrl;U Bookmarks Remove Bookmark

  Remove an existing bookmark. A dialog will be opened with a list of available bookmarks; select the one you wish to remove.

Bookmarks Remove All

  Clear the bookmark list.

&Alt;Down Bookmarks Goto Next Bookmark

  Move the cursor to the next bookmark.

&Alt;Up Bookmarks Goto Previous Bookmark

  Move the cursor to the previous bookmark.

### Tools Menu

Tools Extract Strings...

  Locate ASCII strings in the data. Minimum string length, case sensitivity and a pattern to match can be specified.

Tools Binary Filter...

  Perform a binary operation on the data. The operation (AND, OR, ROTATE..) and an operand can be specified in the dialog box. Checkboxes in the dialog allow the operation to be limited to selected bytes or the region before or after the cursor.

Tools Character Table

  Open a list of values and their ASCII equivalents and insert the selected value at the cursor.

Tools Converter

  Enter a value in any of the fields and see its equivalent in hexadecimal, decimal, octal, binary or text. A check box allows viewing of the value at the cursor instead.

Tools Statistics

  Display the frequency of occurrence of values in the document.

### Documents Menu

Provides a list of the open documents. Selecting one makes it active.

### Settings Menu

Settings Show Toolbar

  Toggle display of the toolbar below the menubar.

Settings Show Statusbar

  Toggle display of the statusbar

Settings Show Full Path

  Toggle display of the full file path in the titlebar

Settings Document Tabs

  Change display of tabs for all current documents. The tab can be displayed above or below the editor window, or hidden. You may find the tabs more convenient than the document menu for switching documents.

Settings Conversion Field

  Change display of the value conversion field. It can be embedded in the main window, made a floating window or hidden.

Settings Searchbar

  Change display of the value searchbar. It can be displayed above or below the editor window, or hidden.

Settings Save Options

  Save the current state of the options.

Settings Preferences...

  Change these settings:

  Layout

    Line and column size (in bytes). These can be set separately for different modes. Fixed number of bytes per line. Lock column at end of line. Gridlines between rows and columns. Width of field separators, spacing and margins.

  Cursor

    Blink rate and shape of the cursor. Behavior of the cursor when the window loses focus.

  Font

    Font name, style and size. Character used to display nonprinting characters in the text field.

  Colors

    All colors in &khexedit; can be customized, including odd and even lines and columns, bookmarks, separators and grid lines. The one exception is the selection color, which uses the setting chosen in the KDE Control Center.

  Files

    Opening of the last, or all recent documents on startup. Restoration of cursor position. Write protection enabled by default. Make a backup upon saving files. Saving of Recent Documents list on exit. The Recent Documents list can also be cleared in this dialog.

  Miscellaneous

    Automatic copy to clipboard upon selection. Startup in insert mode, rather than overwrite. Confirmation required for wrapping to the beginning or end during searches. Cursor jumps to nearest byte when moved in binary mode. Sound on typing input or fatal failure. Display of bookmarks in the offset column and editor fields. Warning when number of printable pages exceeds a settable limit. Maximum number of undos.

### Help Menu

&help.menu.documentation;

### Toolbar

The toolbar contains icons for the following commands:

(Except for Drag document and Toggle write protection, all behave identically to the menu command.)

- Drag document -- Click this button and drag to a text editor or a new &khexedit; window.

- New

- Open

- Revert

- Save

- Print

- Find

- Find Next

- Find Previous

- Cut

- Copy

- Paste

- Undo

- Redo

- Cancel Operation

- Help

..and at the right of the toolbar..

Toggle write protection - switch between read-only and read/write modes.

#### Searchbar

The searchbar is used to locate a specific value in the document. Enter a value in the box, select the desired representation (hexadecimal, octal, binary, decimal or text) and hit the Find button. Check the Backwards box to search backwards from the cursor point or check Ignore case for a case-insensitive text search. Click the button on the right of the bar (X) to hide the searchbar; go to Searchbar in the Settings menu to restore it.

#### Conversion field

The conversion field displays the values of various datatypes at the selected byte. For 8 bit types, it displays the value of the byte under the cursor; for larger types, it displays the value starting at that byte. The rightmost column displays various encodings of the current byte. Options in the conversion field are:

Show little endian decoding

  When checked, causes multibyte types to be calculated using the little-endian method used by x86 and Alpha processors. In this scheme, the first byte represents the least significant part of the value. (0a 4e = 0x4e0a = 19978) When unchecked, causes multibyte types to be calculated using the big-endian method used by PowerPC and Sparc processors. (0a 4e = 0x0a4e = 2638)

Show unsigned as hexadecimal

  When checked, causes unsigned types to be displayed in hexadecimal, rather than decimal format.

Stream length

  Determines the number of bits used to calculate the values in the fields above it.

#### Status Bar

The status bar displays the following information:

Encoding/Selection

  When there is no selection, this field shows the encoding option used. (See View Document Encoding for more information on encoding.) The start point and the length of the selection are shown.

File Modified

  A `!` in this box indicates the current file was modified.

Insert/Overwrite

  Indicates whether values entered at the keyboard are inserted at the cursor point (INS) or overwrite the existing data starting at the cursor(OVR). Use the Insert key to toggle betwen the two modes.

Size

  Displays the total size of the current document.

Offset

  Indicates the position of the cursor within the document.

Display mode

  Indicates whether data editor window is diplaying values in hexadecimal, octal, binary, decimal or text mode. Switch between modes with the View menu.

Write Protection

  Indicates whether the document can be edited (RW) or is being viewed read-only (R). Switch between modes with the button on the far-right of the toolbar or the Permissions command in the File menu.

## Credits and License

&khexedit;

Program copyright 1999-2000 Espen Sand espensa@online.no

Contributors:

- Leon Lessing leon@irlabs.com

- Craig Graham c_graham@hinge.mistral.co.uk

- Dima Rogozin dima@mercury.co.il

- Edward Livingstone-Blade sbcs@bigfoot.com

Documentation copyright 2000 Jonathan Singer jsinger@leeta.net

&underFDL; &underGPL;

## Compilation and Installation

&install.intro.documentation; &install.compile.documentation;

&documentation.index;