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Move obfuscator tests into obfusc.c.

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I just found these self-tests lying around in mines.c under an #ifdef
that nobody ever enables. Let's put them somewhere more sensible! We
already have a separate tool for working with the obfuscation system
in a puzzle-independent way, and it seems reasonable to put them in
there.
This commit is contained in:
Simon Tatham
2023-04-16 08:44:33 +01:00
parent 6fb890e0ea
commit 0d86fe4b74
2 changed files with 79 additions and 67 deletions
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67
mines.c
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@ -1902,72 +1902,7 @@ static char *describe_layout(bool *grid, int area, int x, int y,
static bool *new_mine_layout(int w, int h, int n, int x, int y, bool unique,
random_state *rs, char **game_desc)
{
bool *grid;
#ifdef TEST_OBFUSCATION
static int tested_obfuscation = false;
if (!tested_obfuscation) {
/*
* A few simple test vectors for the obfuscator.
*
* First test: the 28-bit stream 1234567. This divides up
* into 1234 and 567[0]. The SHA of 56 70 30 (appending
* "0") is 15ce8ab946640340bbb99f3f48fd2c45d1a31d30. Thus,
* we XOR the 16-bit string 15CE into the input 1234 to get
* 07FA. Next, we SHA that with "0": the SHA of 07 FA 30 is
* 3370135c5e3da4fed937adc004a79533962b6391. So we XOR the
* 12-bit string 337 into the input 567 to get 650. Thus
* our output is 07FA650.
*/
{
unsigned char bmp1[] = "\x12\x34\x56\x70";
obfuscate_bitmap(bmp1, 28, false);
printf("test 1 encode: %s\n",
memcmp(bmp1, "\x07\xfa\x65\x00", 4) ? "failed" : "passed");
obfuscate_bitmap(bmp1, 28, true);
printf("test 1 decode: %s\n",
memcmp(bmp1, "\x12\x34\x56\x70", 4) ? "failed" : "passed");
}
/*
* Second test: a long string to make sure we switch from
* one SHA to the next correctly. My input string this time
* is simply fifty bytes of zeroes.
*/
{
unsigned char bmp2[50];
unsigned char bmp2a[50];
memset(bmp2, 0, 50);
memset(bmp2a, 0, 50);
obfuscate_bitmap(bmp2, 50 * 8, false);
/*
* SHA of twenty-five zero bytes plus "0" is
* b202c07b990c01f6ff2d544707f60e506019b671. SHA of
* twenty-five zero bytes plus "1" is
* fcb1d8b5a2f6b592fe6780b36aa9d65dd7aa6db9. Thus our
* first half becomes
* b202c07b990c01f6ff2d544707f60e506019b671fcb1d8b5a2.
*
* SHA of that lot plus "0" is
* 10b0af913db85d37ca27f52a9f78bba3a80030db. SHA of the
* same string plus "1" is
* 3d01d8df78e76d382b8106f480135a1bc751d725. So the
* second half becomes
* 10b0af913db85d37ca27f52a9f78bba3a80030db3d01d8df78.
*/
printf("test 2 encode: %s\n",
memcmp(bmp2, "\xb2\x02\xc0\x7b\x99\x0c\x01\xf6\xff\x2d\x54"
"\x47\x07\xf6\x0e\x50\x60\x19\xb6\x71\xfc\xb1\xd8"
"\xb5\xa2\x10\xb0\xaf\x91\x3d\xb8\x5d\x37\xca\x27"
"\xf5\x2a\x9f\x78\xbb\xa3\xa8\x00\x30\xdb\x3d\x01"
"\xd8\xdf\x78", 50) ? "failed" : "passed");
obfuscate_bitmap(bmp2, 50 * 8, true);
printf("test 2 decode: %s\n",
memcmp(bmp2, bmp2a, 50) ? "failed" : "passed");
}
}
#endif
grid = minegen(w, h, n, x, y, unique, rs);
bool *grid = minegen(w, h, n, x, y, unique, rs);
if (game_desc)
*game_desc = describe_layout(grid, w * h, x, y, true);