Thread: File troubles

I am working on a program to manipulate files. Data is read
from input file and is to be transposed into the output file.


Here is the description :

Input File

^A^@^U^G^L^G^Q^G^F^h
^H^P^a^j^i^k^l^m^f^x

and multiple lines like this. Specs. indicate each line can
be upto 32MB!!!.

I am printing the decimal equivalent of these characters in the
output file. Output has to be like :

/* I have copied input chars. to illustrate. In reality output file
has decimal equivalents of input chars. */

^A^H
^@^P
^U^a
^G^j
^L^i
^G^k
^Q^l
^G^m
^F^f
^h^x

and so on.

What I have done is to read each line into a 'unsigned char buffer'. Find the length of the buffer, print each character
of the buffer, add a newline and advance file pointer.

fp1 = Output file pointer
length = Length of input buffer(line)
buf = unsigned char buffer

/** Snippet of code **/
for(index = 0 ; index < length ; index++)
{
pos = ftell(fp1) ;
fprintf(fp1,"%d",buf[index]);
fprintf(fp1,"\n");
pos = ftell(fp1) ;
fseek(fp1,pos+(length/2)-1,SEEK_SET);
}
iteration+= 1 ; /* Moves the fp1 to beginnig of 2nd col. */
fseek(fp1,iteration,SEEK_SET);
/********************/

This does print the data as I want it. But it also adds extra
characters to the output file(I believe newline). I do not want
that. Is there is a way it can be accomplished without adding
'extra/new' characters in the output file.


PS : The input files can be very huge, as they are generated by
a automatic chip tester. Each line can be upto 32MB !!!.So far
I have worked on only simple file stuff.

Any inputs are really appreciated.


Thanks in advance.

fopen("myfile.xyz", "rb")
fopen("myfile.abc","wb")

Binary is your friend.

Quzah.

Salem,
The code snippet is the actual code I have used to print the
buffer contents. Buffer contains the data from the input file.

I am opening files and reading the input file contents using
the following statements.

/* Opening input and output file */
fp = fopen("input_file", "rb");
fp1 = fopen("output_file,"wb");

/* Reading from input file */
fread(buf,sizeof(char), MAX_SIZE,fp) ;
length = strlen(buf) ;


Quzah ,

I am using binary mode to open files.

Thanks.