04-14-2009
Yes, your solution works well for the simplified dataset i provided. Thanks.
However, after I tried it on one of my real datasets (10s of MBs of numbers) it turned out I actually need a more complicated transformation of the numbers. (I hadn't realised this before I saw the result of the reversing done by this code.)
So my real case is as follows: The numbers in the datafile are a matrix of 1253 rows times 1977 columns. They are stored in a file with 6 numbers per row (a header provides the real number of columns and rows), which makes a matrix of 412864 rows times 6 columns. What I need to do is reversing the matrix the numbers represent (1253x1977), not the matrix of the datafile (412864x6).
If anyone understood my problem, I'm very happy to see a code which solves this problem!
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LEARN ABOUT DEBIAN
load_datafile
load_datafile(3alleg4) Allegro manual load_datafile(3alleg4)
NAME
load_datafile - Loads a datafile into memory. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
DATAFILE *load_datafile(const char *filename);
DESCRIPTION
Loads a datafile into memory in one go. If the datafile has been encrypted, you must first call packfile_password() to set the appropriate
key. If the datafile contains truecolor graphics, you must set the video mode or call set_color_conversion() before loading it. Example:
/* Load the resources for our game. */
DATAFILE *dat = load_datafile("game.dat");
if (!dat)
abort_on_error("Couldn't load sound resources!");
/* Use resources. */
...
/* Destroy them when we don't need them any more. */
unload_datafile(dat);
RETURN VALUE
Returns a pointer to the DATAFILE, or NULL on error. Remember to free this DATAFILE later to avoid memory leaks.
SEE ALSO
load_datafile_callback(3alleg4), unload_datafile(3alleg4), load_datafile_object(3alleg4), set_color_conversion(3alleg4),
fixup_datafile(3alleg4), packfile_password(3alleg4), find_datafile_object(3alleg4), register_datafile_object(3alleg4), excustom(3alleg4),
exdata(3alleg4), exexedat(3alleg4), exgui(3alleg4), exsprite(3alleg4), exunicod(3alleg4)
Allegro version 4.4.2 load_datafile(3alleg4)