How to extract information from .png?

Question

Programming

Hey guys. Situation: there is a .png file, at the beginning there is an xml code that I need. How to change it, and then save these changes in a file? Or at least take it out. An example of such a file:

Answer 1

For example, HIEW can definitely handle such a task.

Answer 2

Well, you take this file, split it into parts, then change the part you want, and save everything to a new file. If it is saved, then you replace the original file with it.
How to divide into parts? By length in bytes or by marker (attribute).

Answer 3

There is a useful utility TweakPNG , with its help you can pull / add any chunk from png.