大约有 620 项符合查询结果（耗时：0.0319秒） [XML]
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...iminates the multiplication by emitting code that instead increments i by 1e9 each iteration (and changing the loop condition accordingly). This is a perfectly valid optimization under the "as if" rule as this program could not observe the difference were it well-behaving. Alas, it's not, and the op...
Cross-browser testing: All major browsers on ONE machine
...should be included?
Preparation
Windows XP
Windows 7+ (for IE9+)
Browser downloads
Internet Explorer
Firefox
Opera
Chrome
Safari
Adobe Flash Player
Download summary
Sandboxie
Part 2: Installation and configuration
Internet Explorer
Firefox
Opera
...
Is either GET or POST more secure than the other?
...RO8w?FoaObi)
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_o_2yoBP)orw7H...
Floating point vs integer calculations on modern hardware
...e @Peter Cordes
https://gist.github.com/Lewiscowles1986/90191c59c9aedf3d08bf0b129065cccc
i7 4700MQ Linux Ubuntu Xenial 64-bit (all patches to 2018-03-13 applied)
short add: 0.773049
short sub: 0.789793
short mul: 0.960152
short div: 3.273668
int add: 0.837695
int sub: ...
Why does struct alignment depend on whether a field type is primitive or user-defined?
...witch to 4-byte integers and put &test in the Address field:
0x000000E928B5DE98 0ed750e0 000000e9 11111111 00000000 22222222 00000000
0xe90ed750e0 is the string pointer on my machine (not yours). You can easily see the Int32Wrappers, with the extra 4 bytes of padding that turned the size ...
demystify Flask app.secret_key
...ha1(cookie_bytes+SECRET_KEY).hexdigest()
>>> print(signature)
7ae0e9e033b5fa53aa....
( 4 ) Now affix the signature at one end of the content field of the original cookie.
# include signature as part of the cookie
>>> cookie.content = cookie.content + '|' + signature
>>>...
u'\ufeff' in Python string
... BOM decoded with utf-16le %r' % e16.decode('utf-16le')
Note that EF BB BF is a UTF-8-encoded BOM. It is not required for UTF-8, but serves only as a signature (usually on Windows).
Output:
utf-8 'ABC'
utf-8-sig '\xef\xbb\xbfABC'
utf-16 '\xff\xfeA\x00B\x00C\x00' # Adds BOM and encode...
SQL injection that gets around mysql_real_escape_string()
...attack...
mysql_query('SET NAMES gbk');
$var = mysql_real_escape_string("\xbf\x27 OR 1=1 /*");
mysql_query("SELECT * FROM test WHERE name = '$var' LIMIT 1");
In certain circumstances, that will return more than 1 row. Let's dissect what's going on here:
Selecting a Character Set
mysql_query('SET N...
Unicode equivalents for \w and \b in Java regular expressions?
...C (NFD followed by canonical composition). An example is that code point U+E9 ("é") is a \pL in NFC form, but its NFD form becomes U+65.301, so matches \pL\pM. You can kinda get around this with \X: (?:(?=\pL)\X), but you’ll need my version of that for Java. :(
– tchrist
...
Fastest way to list all primes below N
...st with pypy. This is what I found for the non-numpy ones gist.github.com/5bf466bb1ee9e5726a52
– Ehsan Kia
Apr 28 '14 at 1:53
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