So I came up with this simple encrypt/decrypt algorythm:
void code(char *in, int size)
{
while(x < size)
in[x++] += in[x] < 64? 64: -64;
}
...and it works about 95%-99% correctly!!! Why?
When I fread into a buffer, "code()", fwrite, then repeat the process, opening the file to view it I notice some characters have changed into sort of wing-dings. Not what I intended...and it absolutely corrupts image files because of this...
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
encrypting image files, eh? heh heh...
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
//edit: I'm stupid, I missed a plus sign.
Hmm....
It would be worth you seeing if the char it started to choke on was '@'......
Just a theory......
ASCI 64 = '@'........
so
in[x++] += in[x] < 64? 64: -64;
is
64 += 65 <64?:-64; == 64 - 64....
Therefore the char is now 0....which in ASCII is NULL......so when you do something with that byte maybe its causing problems ???
May be wrong, but have a look at what char is causing trouble
>and it absolutely corrupts image files because of this...
Your algorithm is only going to work for text files (characters in the 0-127 range). For image files, you need to change your algorithm a bit.
then there isn't a type of alg that would work with ALL files?
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
You might try this.
For a char, there is 256 possible values, so you kind of need to be able to divide this into two halfs, a top half and a bottom half. That way the algorithm knows whether to add or subtract.Code:void code(char *in, int size) { int x = 0; while(x < size) { if (in[x] < 0) in[x++] -= -128; else in[x++] += -128; } }
