FlexHEX Installation File. FlexHEXEditor is a full-featured hex editor for software professionals. Can edit huge files, NTFS alternate streams, sparse files, OLE compound files, logical disks, and physical drives.
This article provides an extensive descriptionof the FlexHEX file comparison feature.
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How To Compare
First, open the file you wish to compare. We call this objectthe primary file.
NOTE: Although we often say file comparison, it is notonly files that can be compared. You can also compare physical and logical drives,alternate streams, compound file streams, in fact, you can compare any objectthat can be opened for hex editing
Second, open the comparison window using the Search / Comparecommand and select the object to compare the primary file with. We call this objectthe secondary file, although it may also be a logical or a physical drive.
Block comparison
You can compare only a part of the file by specifying the starting address and the block size.
NOTE: If the primary file has an active selection, FlexHEX assumes you arerequesting block comparison and pre-fills the appropriate fields.
The block comparison mode is fairly obvious; the only thing worth mentioningis how the program interprets empty fields. An empty offset field meansthe lowest address, which is usually, but not always, zero. An empty sizefield means the rest of the file.
Comparison Result
There are three block types that can be found as the result of a comparison operation:
- Green identical (matching) blocks,
- Red replaced (differing) blocks,
- Blue inserted (unique) blocks.
Basically, differing and unique blocks are similar - both contain data notpresent in the other file, and both reside between two green blocks. The onlydifference is whether the other file also contains some non-matching data betweenthe corresponding green blocks. If yes, we call the block differing, otherwiseit is unique.
Click the picture to open a larger view.
The screenshot above includes three screen parts related to the comparison.They are the main edit window (in the two-file view mode), the comparison map,and the Comparison pane.
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Edit Window
The edit window shows both the file being compared - the primary file inthe top pane, and the secondary file in the lower pane (if you select theside-by-side arrangement, the primary file will be shown in the left pane).
The primary and the secondary file are treated slightly differently:the secondary file is always read-only. There is a reason for such alimitation - the secondary file is not being edited, it is just beingcompared with. It may be in use by the system or another application,and an attempt to open it for read/write access may cause an error. Thisis the only limitation though - you can browse the secondary file, definebookmarks and data fields, copy, drag, export data, and so on.
Comparison Map
The map in the left of the edit area shows the file layout andthe correspondence between blocks in a graphical form. It is extremelyuseful, especially if the files being compared don't contain too largeor too small blocks.
If you don't need the map, use the Show Comparison Mapcommand in the View menu to turn it off.
Comparison Pane
The Comparison pane provides the complete information about the filelayout. Note however that there are in fact two panes because each filehas its own layout. If you switch between the primary and the secondary file,you will notice that the block list in the Comparison pane changes accordingly.
As with other navigation panes, clicking the Start field moves the caretto the start of the appropriate block, and clicking the Size field selectsthe block. There is one more field though: Corresponds To.It displays the address of the another file's block corresponding to this one;clicking this field moves the caret to the start of that block (switching thecurrently active file).
A Few Tips
Switching to the Standard View
In order to switch to the standard single-file view without discardingthe comparison result, select the Stream pane in the lower left Navigation panel.Selecting the Comparison pane again will switch the edit window back tothe two-file view. Selecting any other pane will not affect the edit window.
Recomparing
If you modify the primary file, the comparison result becomes invalid.Unfortunately, it is not possible to update the comparison result onthe fly - you will have to repeat the compare operation.The Search / Compare Again menu command repeatsthe previous compare using the same arguments.
As a rule of thumb, if the text in the header of the active file panechanged its color from black to red, this means that the primary file has beenchanged and that the current comparison result is no more actual. Re-comparingor undoing the changes will make the result actual again.
Will it find all matching blocks?
Sometimes it won't. Don't expect the algorithm to find a 100-byte long matchimmediately after 50 megabytes of non-matching data. The only way to ensure thatall matching blocks are found is to try every byte against every other byte.FlexHEX does this when comparing small files, but for larger files this approachwould take ages. A more practical method is to try only selected patterns,resynchronizing when a match is found. Unfortunately this means that smallmatching blocks sometimes may be overlooked.
This applies to matching blocks only. All differing blocks, no matter how small,are guaranteed to be found.
Comparison Order
Sometimes you may get different results comparing A to B and B to A,specifically when A and B are large files with many small matching anddiffering areas. As explained before, the comparison algorithm is notwholly deterministic, and so resynchronizing might occur in differentpositions depending on what is compared to what.
Comparing with an alternate stream
Although the comparison dialog allows selecting files and drives only,it is also possible to specify an alternate stream as the secondary file.Enter the file path either by typing it, or by using the Browse button,and then add the colon character and the name of the alternate stream.
If the stream name contains a special non-printable character, enter itby holding the Alt key and typing a three-digit decimal character code(you can't use the character escape sequences in the comparison dialog).
Comments (3)
You could also have results printed out in different file format like pdf.
results could be statistically represented.
Great tool again but you will need to have a view to print report of comparison like a graph or pie chart-like! Then the tool freezes a bit don't know why that is can't confirm whether its my system or not but doubt a bit!!!
Thanks! We will certainly improve the comparison tool in the next major release.
This is a great tool!!!!!!!!!!!!! BRAVO!!!!!!
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HexCmp is a program, which combines together the features of a hex file comparison application and a convenient hex editor. The program will help you to compare files in binary format, at the same time serving as a hex editor that will edit and modify your files. Hex comparison is made on-the-fly, while scrolling down the files. Enhanced with features like color highlighting; synchronous scrolling; an Info panel, which shows the file information in different formats and more, this program will most definitely become an asset for both home users and companies.
Instead of the full files comparison, upon loading you can compare just the current parts of the files, displayed on the screen, which saves you your working time. HexCmp supports files up to 4 GB. You can navigate among different blocks or files, choose the required parts of files to compare (just scroll down the file), set your own color scheme, use the Undo, Redo and Search functions. Besides the hex format, the program can also compare files in text format. String searching can be done in both formats as well. All commands are conveniently assigned to hotkeys. You can work with HexCmp, using your keyboard only.