wavread problems update

[Doug Stewart]

While modifying wavread.m I came across an issue with strcmp
here is part of wavread:

fpi = fopen(infile,'r');
id = fread(fpi, 1,'int32');

if (strcmp(id,'RIFF')!=0)
 error(sprintf('%s not a WAV file',infile));
end
disp(sprintf('Input file \'%s\' is RIFF format:',infile));
nbytes = fread(fpi, 1,'int32');
disp(sprintf('\tTotal length = %d bytes',nbytes));

subfmt = fread(fpi, 1,'int32');

s(4)=round(subfmt/(256^3));
sb=subfmt-s(4)*256^3;
s(3)=round(sb/256^2);
sb=sb-s(3)*256^2;
s(2)=round(sb/256^1);
sb=sb-s(2)*256^1;
s(1)=round(sb);
ss=setstr(s);

 disp(sprintf('Subformat = \'%s\' ',ss));
if (strcmp(subfmt,'WAVE')!=0)
 error('*** Cannot handle subformat %s',subfmt);
end




In the section

id = fread(fpi, 1,'int32');
if (strcmp(id,'RIFF')!=0)

we are reading a 32 bit number from the file and in the "if strcmp" we 
are assuming it is a string.
But this does not work. Should strcmp  handle this? 

To make it work I took the 32 bit number apart into 8 bit numbers and 
made a string then it works.

this code is not elegant yet and is not a finished product.

I just wanted to know if I should make strcmp handle this?
also is there a function that will do what I have done in the following? 
( take a number and assume it is some ascii chars)


s(4)=round(subfmt/(256^3));
sb=subfmt-s(4)*256^3;
s(3)=round(sb/256^2);
sb=sb-s(3)*256^2;
s(2)=round(sb/256^1);
sb=sb-s(2)*256^1;
s(1)=round(sb);
ss=setstr(s);

Doug Stewart





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