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Unexpected results when working with very big integers on interpreted languages
... supports arbitrary precision. It will produce the correct answer on 32 or 64 bit platforms.
This can be seen by raising 2 to a power far greater than the bit width of the platform:
>>> 2**99
633825300114114700748351602688L
You can demonstrate (with Python) that the erroneous values yo...
How to check if running in Cygwin, Mac or Linux?
...
If I run a script under cygwin by executing "\cygwin64\bin\bash -c scriptname", this doesn't necessarily work. In this situation, the cygwin path doesn't get set up and uname -s ends up calling whatever uname is first in your current path, which on my system turns out to be t...
How to measure time in milliseconds using ANSI C?
...lude <stdio.h>
#include <stdint.h>
#include <time.h>
int64_t timespecDiff(struct timespec *timeA_p, struct timespec *timeB_p)
{
return ((timeA_p->tv_sec * 1000000000) + timeA_p->tv_nsec) -
((timeB_p->tv_sec * 1000000000) + timeB_p->tv_nsec);
}
int main(in...
Find which commit is currently checked out in Git
...ell before version 1.8.3, I'm just not sure in which version it was introduced:
git bisect visualize
git bisect view # shorter, means same thing
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How does this print “hello world”?
...
The number 4946144450195624 fits 64 bits, its binary representation is:
10001100100100111110111111110111101100011000010101000
The program decodes a character for every 5-bits group, from right to left
00100|01100|10010|01111|10111|11111|01111|01100|011...
Transfer-Encoding: gzip vs. Content-Encoding: gzip
...P as the proper way to do on-the-fly encoding without changing
the resource.
Source: https://issues.apache.org/bugzilla/show_bug.cgi?id=39727#c31
In other words: Don't do on-the-fly Content-Encoding, use Transfer-Encoding instead!
Edit: That is, unless you want to serve gzipped content to clie...
Encrypt & Decrypt using PyCrypto AES 256
...of the key and secret phrase with 32 bytes and iv to 16 bytes:
import base64
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
class AESCipher(object):
def __init__(self, key):
self.bs = AES.block_size
self.key = hashlib.sha256(key.encode()).digest()
...
Hiding a password in a python script (insecure obfuscation only)
...
Base64 encoding is in the standard library and will do to stop shoulder surfers:
>>> import base64
>>> print(base64.b64encode("password".encode("utf-8")))
cGFzc3dvcmQ=
>>> print(base64.b64decode("cGFz...
80后夫妻创业，如今身价68亿，怎么做到？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...生会实践部部长一职，经常到校外拉赞助搞活动。他有一位叫孙凡的朋友，其工作的公司销售一种名叫光纤收发器的终端接入设备。在宽带业务刚刚兴起时，这是电信公司必需的一种设备。
他们发现了中间的商机，连同吴艳（...
Connecting to remote URL which requires authentication using Java
... = username + ":" + password;
String basicAuth = "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes()));
uc.setRequestProperty ("Authorization", basicAuth);
InputStream in = uc.getInputStream();
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