[SOLVED] Extract .png inside a .bin file

[rootx]

how can I extract all the png images contained in a file? 

I would like to save each range in a .png file, as I do with the hex editor manually.

start = 89 50 4E 47 0D 0A 1A 0A

End = 49 45 4E 44 AE 42 60 82

 

Thx

 

 

Edited August 6, 2020 by rootx

[TheXman]

It depends on where and how the images are stored in the executable.  If the images are store in the executable's resource area, then you could use functions in the WinAPIRes UDF file to access them.  If they are stored somewhere else in the executable, then you would need some other method(s).  If they are stored compressed or encoded, then you need to take that into consideration also.  In other words, who knows because you haven't provided enough information.

Edit:

I just recognized that you specifically said a .bin file, not an executable.  Not sure what your .bin file is and how it was created, other than it's a binary file.  Assuming that the images are not stored compressed or encoded in the .bin file, you could open file the file as binary and extract file the binary image data using the starting and ending tags, with a regular expression.  You could then save that extracted binary data as a binary file.

Edit:

Actually a StringRegexp function probably wouldn't work because it would stop when a null byte (0x00) was encountered.  Since you are familiar with extracting the .png files with your hex editor, maybe you can automate using it to extract the files.  Or, you could open and read through the binary file byte by byte looking for your starting and ending tags.

Edited August 3, 2020 by TheXman

[TheDcoder]

@rootx You have to go through each byte and compare the values with known values. Remember that a byte is just nothing but an 8 digit binary number

My apologies for the lack of an example, I am a bit busy at the moment. Hopefully someone will take out the time to show you

[jchd]

Yo can use the code provided in this thread to perform regex search in binary:

 

Edited August 3, 2020 by jchd

[TheXman]

1 minute ago, jchd said:

Yo can use the code provided in this thread to perform regex search in binary:

Since StringRegexp is a function that returns strings, would the result, if it had embedded null bytes (0x00), be the whole result or would it be truncated at the first null byte?

[jchd]

It will work. The binary is converted to a string of UCS2 encoding units with exact same data: only the encoding is changed. PCRE (the underlying regex processing code is imune to embedded NULLs.

In AutoIt 0x00 is only a string termination on I/O (AFAICT).

Edited August 3, 2020 by jchd

[rootx]

On 8/3/2020 at 10:01 PM, TheDcoder said:

@rootx You have to go through each byte and compare the values with known values. Remember that a byte is just nothing but an 8 digit binary number

My apologies for the lack of an example, I am a bit busy at the moment. Hopefully someone will take out the time to show you

Thanks for the tip, I found my solution, FileSetPos and then loop the entire file.

[TheDcoder]

@rootx Glad to be of assistance

[Nine]

@rootx Could you provide your code, someone else could find it helpful. Thanks.

Edited August 5, 2020 by Nine

[rootx]

13 hours ago, Nine said:

@rootx Could you provide your code, someone else could find it helpful. Thanks.

I read this discussion as jchd advised me.

Edited August 6, 2020 by rootx