Change internals of RZX

Bedazzle

Is there any tool that can replace game snapshot inside of RZX?
I'm trying to compile new binary, and for testing purposes need to "play" game from start to end.

P.S.
original and compiled binaries are compared byte by byte, I need to check if it is working when relocated.

Fred

rzxtool from the fuse-utils package can do that:

NAME
       rzxtool - Modify Sinclair ZX Spectrum input recording files

SYNOPSIS
       rzxtool   [-dblock  number]  [-eblock  number,filename]  [-iblock  num-
       ber,filename] [-u] rzxfile [outfile]

DESCRIPTION
       rzxtool allows some simple modifications to  be  made  to  Sinclair  ZX
       Spectrum  input  recording  files: blocks can be removed, snapshot data
       can be extracted or snapshots can be inserted into the file.  The  file
       can also be uncompressed.

Bedazzle

Cool, thanks! Will try. :)