how do i split and join files?

[PeterH]

Here goes your script but some notes first:

1. SC readfile won't stop if numbytes value exceeds the remaining data to be read, thus generating files which are multiples of numbytes. This issue is fixed in my script.

2. bug warning SC writefile won't properly write unicode files as it completely loses formating when writing portions which contain unicode text.

Both nonsense. I stopped reading further.

Maybe this has something to do with a wrong calculated number for start-byte? (0-based instead of 1-based!)

If with start-byte = 0 XY ReadFile corrects this to 1, it will read (with values of above script) bytes 1-500.000. The next will request bytes 500.000-999.999, i.e. byte 500.000 is read (and then written) twice.

If I'm right the bug is in the script...

[neutrox]

I modified the code following PeterH's guidance and trying to fix the problem myself. Maybe it's a noob dumbness but the problem still remains ie a 1.132 bytes file wont split in 2 x 500 + 132 but in 3 x 500.

the splitting point is now fixed. please notice: the following code is meant for tests only to try to show the problem which really happens.

p.s. hey scripting is fun

Code: Select all

      end(compare("<xyver>", '10.90.0002', 'v') < 0, "Written for XYplorer v10.90.0002+.");
      end(getinfo("CountSelected") < 1), "Pick a file first!";

      $file = "<curitem>";
      $basenm = regexreplace($file, ".+\\(.+)\..*", "$1");
      $tdir = regexreplace($file,  "(.+\\).+", "$1");
      $ext = regexreplace($file, ".+\.(.*)", "$1");

      $max = filesize($file);
      $read = 500000; //amount which will be read; user def; default: 100.000 bytes (x 10 = 1 MB)

      $factor = $max \ $read;
      $factorF = $factor * $read;
      $mod = $max - $factorF;

      $incr = 1; //starting amount; FIXED

      WHILE ($incr < $max)                   {
      $data = readfile(, , $read, , $incr);
      $incr = $incr + $read;

      writefile ("$tdir" . "$basenm" . " - Splitted." . "$ext", $data, r);
                                                 }

      echo "file splitted!";

[PeterH]

Here goes your script but some notes first:

1. SC readfile won't stop if numbytes value exceeds the remaining data to be read, thus generating files which are multiples of numbytes. This issue is fixed in my script.

This point is verified

For a first test I happened to take a .txt-file of 20 lines, each 100 chars + CRLF, that is 2040 bytes.
Read 3 times 700 bytes and wrote each to separate file.
File 1 & 2 OK: each 700 byte.
File 3 strange: it is shown as "binary"
Check of this file shows: it's 700 byte long ( ) and the bytes missing in source are filled with hex 00! I think that's the reason why this file is shown as binary!

This means: trying to read more bytes than are left in the file leads to appended hex 00 to fill the requested size!

I hope this is not intended?

[admin]

Damn, yes! Shame on me, but Tiago was right. The combination of numbytes and start indeed allowed to apparently read characters beyond EOF. (In fact the read buffer was not redimensioned correctly.) Fix comes.