[Octave-bug-tracker] [bug #63931] Binary fwrite writes incorrect data to file

[Dmitri A. Sergatskov]

Follow-up Comment #8, bug #63931 (project octave):

Here is modified test script:


$ cat t1.m 
for ii = 1:3
  val = uint8(126+ii)   
  n = 1; 
  a = ones(n,1)*val;
  f = fopen('a.a','wb');
  cw = fwrite(f,a,'uint8')
  fclose(f);

  f = fopen('a.a','rb');
  [b, cr] = fread(f,n,'uint8');
  fclose(f);

  cr1 = cr
  x = a(1)
  y = b(1)
endfor



Running it:


>> clear
>> whos
>> t1
val = 127
cw = 1
cr1 = 1
x = 127
y = 127
val = 128
cw = 1
cr1 = 1
x = 128
y = 63
val = 129
cw = 1
cr1 = 1
x = 129
y = 63
>>



od -d a.a 
0000000    63
0000001


So some kind of unsigned/signed int mixed up?

Dmitri.
-- 





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