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c++ 64 bit inpout

Posted on 2005-03-29
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Last Modified: 2010-04-01
how can I read from input file as 64 bit blocks?
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Question by:saif20
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5 Comments
 
LVL 8

Expert Comment

by:novitiate
ID: 13650651
what is the format of your input file?

simple fread can do it.

some thing like this...
typedef unsigned char byte;

byte data[8];
fread(fp, data, sizeof(data));

_novi_
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Author Comment

by:saif20
ID: 13650713

thank I 'll give i tray.
my data format is normal text (char) file.
I need to read it in blocks 64 bits split it into two parts and then run ECB encryption in it.
 
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Expert Comment

by:Jaime Olivares
ID: 13651671
if you are working with Windows environment, you can use __int64 data type or maybe ULARGE_INTEGER, so you can have all data in just one fundamental variable.
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Author Comment

by:saif20
ID: 13652279
I am using unix sun solray g++
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Accepted Solution

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jkr earned 1500 total points
ID: 13652453
Solaris should also have "ISO C99: 7.18 Integer types <stdint.h>". So, you could use

union 64bit_buf {

    char plain[8];
    int64_t i64;
};

Then, you can read the text as

FILE* p = fopen("infile","r");
64bit_buf buf;

while (!feof(p)) {

    fread(buf.plain,sizeof(int64_t),1,p);

    do_some_encryprion(&buf.64bit);

}
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