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Kyan

hex replace in autoit

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Kyan

Hi everyone

I have 2 basic question about hex editing

- I have several texts with a common problem, in stead of having CRLF (carriage return+line feed) only had 0x0A (LF), how do I add 0D behind every 0x0A?

- Its possible to edit only the beginning of a file (speaking in large files that should't be loaded in memory) and save the changes?


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One day I'll discover what IE.au3 has of special for so many users using it.
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Nessie

Hi everyone

I have 2 basic question about hex editing

- I have several texts with a common problem, in stead of having CRLF (carriage return+line feed) only had 0x0A (LF), how do I add 0D behind every 0x0A?

- Its possible to edit only the beginning of a file (speaking in large files that should't be loaded in memory) and save the changes?

For the first question maybe? :

$string = "First Line 0x0A Another Line"
$replace_string = StringReplace($string, "0x0A", "0Dx0A")
MsgBox(0,"", "After: " & $string & @CRLF & "Before: " & $replace_string)

For second question give a look _FileWriteToLine function in the help file:

#include <File.au3>
;Example: Write to line 3 of c:\test.txt REPLACING line 3
_FileWriteToLine("c:\test.txt", 3, "my replacement for line 3", 1)
;Example: Write to line 3 of c:\test.txt NOT REPLACING line 3
_FileWriteToLine("c:\test.txt", 3, "my insertion", 0)

Hi!


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Kyan

For the first question maybe? :

$string = "First Line 0x0A Another Line"
$replace_string = StringReplace($string, "0x0A", "0Dx0A")
MsgBox(0,"", "After: " & $string & @CRLF & "Before: " & $replace_string)

For second question give a look _FileWriteToLine function in the help file:

#include <File.au3>
;Example: Write to line 3 of c:\test.txt REPLACING line 3
_FileWriteToLine("c:\test.txt", 3, "my replacement for line 3", 1)
;Example: Write to line 3 of c:\test.txt NOT REPLACING line 3
_FileWriteToLine("c:\test.txt", 3, "my insertion", 0)

Hi!

thanks for te effort :)

in your first example it replaces all the data without check if a CR (0x0D) exists before a LF (0x0A), it only needs to and a CR behind a LF which doesn't has a CR already

for the second, in case of bynary file, it would work correctly :s


Heroes, there is no such thing

One day I'll discover what IE.au3 has of special for so many users using it.
C'mon there's InetRead and WinHTTP, way better
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Nessie

thanks for te effort :)

in your first example it replaces all the data without check if a CR (0x0D) exists before a LF (0x0A), it only needs to and a CR behind a LF which doesn't has a CR already

for the second, in case of bynary file, it would work correctly :s

For the first example maybe is this?:

$string = "First Line 0x0D0x0A Another Line"
$replace_string = StringReplace($string, "0x0D0x0A", "0Dx0A")
MsgBox(0,"", "After: " & $string & @CRLF & "Before: " & $replace_string)

Hi!

Edited by Nessie

My UDF: NetInfo UDF Play with your network, check your download/upload speed and much more! YTAPI Easy to use YouTube API, now you can easy retrive all needed info from a video. NavInfo Check if a specific browser is installed and retrive other usefull information. YWeather Easy to use Yahoo Weather API, now you can easily retrive details about the weather in a specific region. No-IP UDF Easily update your no-ip hostname(s).

My Script: Wallpaper Changer Change you wallpaper dinamically, you can also download your wallpaper from your website and share it with all!   My Snippet: _ImageSaveToBMPConvert an image to bmp format. _SciteGOTO Open a file in SciTE at specific fileline. _FileToHex Show the hex code of a specified file

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Melba23

DiOgO,

I use this Regex to set every EOL possibility to @CRLF: ;)

#include <Array.au3>

$sText = "Line 1" & @CR & "Line 2" & @LF & "Line 3" & @CRLF & "Line 4" & @LF & "Line 5" & @CR & "Line 6" & @CRLF & "Line 8"

$aLines = StringSplit($sText, @CRLF, 1)
_ArrayDisplay($aLines, "Before")

$sText = StringRegExpReplace($sText, "((?<!\x0d)\x0a|\x0d(?!\x0a))", @CRLF)

$aLines = StringSplit($sText, @CRLF, 1)
_ArrayDisplay($aLines, "After")

It looks for @CR without a following @LF - and @LF without a leading @CR. I hope it helps. :)

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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Kyan

For the first example maybe is this?:

$string = "First Line 0x0D0x0A Another Line"
$replace_string = StringReplace($string, "0x0D0x0A", "0Dx0A")
MsgBox(0,"", "After: " & $string & @CRLF & "Before: " & $replace_string)

Hi!

not exactly, it is in hex code :)

DiOgO,

I use this Regex to set every EOL possibility to @CRLF: ;)

#include <Array.au3>

$sText = "Line 1" & @CR & "Line 2" & @LF & "Line 3" & @CRLF & "Line 4" & @LF & "Line 5" & @CR & "Line 6" & @CRLF & "Line 8"

$aLines = StringSplit($sText, @CRLF, 1)
_ArrayDisplay($aLines, "Before")

$sText = StringRegExpReplace($sText, "((?<!\x0d)\x0a|\x0d(?!\x0a))", @CRLF)

$aLines = StringSplit($sText, @CRLF, 1)
_ArrayDisplay($aLines, "After")

It looks for @CR without a following @LF - and @LF without a leading @CR. I hope it helps. :)

M23

yeah, but what means ?<! and ?! and why is a capture group inside a capture group? (like capturing it 2times xD

btw, you don't know how can a file be edited in a address (0x000024 and lenght 0x2A for i.e.,) and saved without having to copy to another location/file?


Heroes, there is no such thing

One day I'll discover what IE.au3 has of special for so many users using it.
C'mon there's InetRead and WinHTTP, way better
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Melba23

DiOgO,

yeah, but what means ?<! and ?! and why is a capture group inside a capture group? (like capturing it 2times

As I explained, the Regex looks ahead and behind to see if there is the other part of a @CRLF - in which case it does nothing. Let me try and explain:

Follow the numbers in order

(?<!\x0d)     - 2 - Look behind (the ?>! part) and make sure it is NOT preceded by @CR (0x0D)
\x0a        - 1 - Look for @LF (which is 0x0A) then 
|         - 3 - Or
\x0d        - 4 - We look for @CR and then
(?!\x0a)    - 5 - Look ahead (?!) and make sure it is NOT followed by @LF

The parts in () are non-capturing negative lookbehind/lookahead - and are well explained in my favourite Regex tutorial at http://www.regular-expressions.info/tutorial.html.

The whole thing needs to be in () so that it is a capturing group for the SRER to replace.

Any clearer? :D

M23

Edited by Melba23
Fixed url

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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Kyan

DiOgO,

As I explained, the Regex looks ahead and behind to see if there is the other part of a @CRLF - in which case it does nothing. Let me try and explain:

Follow the numbers in order

(?<!\x0d) - 2 - Look behind (the ?>! part) and make sure it is NOT preceded by @CR (0x0D)
\x0a - 1 - Look for @LF (which is 0x0A) then
| - 3 - Or
\x0d - 4 - We look for @CR and then
(?!\x0a) - 5 - Look ahead (?!) and make sure it is NOT followed by @LF

The parts in () are non-capturing negative lookbehind/lookahead - and are well explained in my favourite Regex tutorial at http://www.regular-expressions.info/tutorial.html.

The whole thing needs to be in () so that it is a capturing group for the SRER to replace.

Any clearer? :D

M23

got it, anyone with doubts check this link http://www.regular-expressions.info/quickstart.html (at the bottom page..."Lookaround")

thanks Melba23:D, to ask something about sql/timestamps, should I create another thread?


Heroes, there is no such thing

One day I'll discover what IE.au3 has of special for so many users using it.
C'mon there's InetRead and WinHTTP, way better
happy.png

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jchd

Yes please new topic = new thread


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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