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PO128-bit type error
 

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    <p>Thanks to pbos help and its program (published <a href="https://stackoverflow.com/questions/1656961/xor-on-a-very-big-file">here</a>, for xoring a big file), I performed some tests and I see that I have another problem: having changed the mask by another one of 128-bit, there is no default type as big as needed.</p> <p>I think a solution can be to include a library to increase available integer types... but rather that I prefer to interpret each 128 bits values such as strings. Is this possible without loosing performance?</p> <p>Here is the current program (with the bug "integer constant is too large for its type"):</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #define BLOCKSIZE 128 #define MASK 0xA37c54f173f02889a64be02f2bc44112 /* a 128 bits constant */ void usage(const char *cmd) { fprintf(stderr, "Usage: %s &lt;in-file&gt; [&lt;out-file&gt;]\n", cmd); exit (EXIT_FAILURE); } int main(int argc, char *argv[]) { if (argc &lt; 3) usage(argv[0]); FILE *in = fopen(argv[1], "rb"); if (in == NULL) { printf("Cannot open: %s", argv[2]); return EXIT_FAILURE; } FILE *out = fopen(argv[2], "wb"); if (out == NULL) { fclose(in); printf("Unable to open '%s' for writing.", argv[2]); } char buffer[BLOCKSIZE]; int count; while (count = fread(buffer, 1, BLOCKSIZE, in)) { int i; for (i = 0; i &lt; count; i++) { ((unsigned long *)buffer)[i] ^= MASK; /* this line is bugged */ } if (fwrite(buffer, 1, count, out) != count) { fclose(in); fclose(out); printf("Cannot write, disk full?\n"); return EXIT_FAILURE; } } fclose(in); fclose(out); return EXIT_SUCCESS; } </code></pre> <p>Thank for any suggestions.</p> <p>Doug</p>
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