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How can I calculate an md5 checksum of a directory?
...md5sums are sorted.
The md5sum of this sorted list is then returned.
I've tested this by copying a test directory:
rsync -a ~/pybin/ ~/pybin2/
I renamed some of the files in ~/pybin2.
The find...md5sum command returns the same output for both directories.
2bcf49a4d19ef9abd284311108d626f1 -
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What is the Difference Between read() and recv() , and Between send() and write()?
...reverse problem if 13-10 are consecutive in the binary data, but I haven't tested it. But that appears to be another possible difference between send() and write().
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'App not Installed' Error on Android
...in I have been creating a signed .apk and exporting it to my HTC Desire to test. It has all been fine.
61 Answers
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java.util.regex - importance of Pattern.compile()?
...ormance benefit can be quite significant.
I did a quick benchmark:
@Test
public void recompile() {
var before = Instant.now();
for (int i = 0; i < 1_000_000; i++) {
Pattern.compile("ab").matcher("abcde").matches();
}
System.out.println("recom...
How can I convert an RGB image into grayscale in Python?
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Three of the suggested methods were tested for speed with 1000 RGBA PNG images (224 x 256 pixels) running with Python 3.5 on Ubuntu 16.04 LTS (Xeon E5 2670 with SSD).
Average run times
pil : 1.037 seconds
scipy: 1.040 seconds
sk : 2.120 seconds
PIL and ...
How to read the content of a file to a string in C?
...e more tricky, and unfortunately I don't have a compiler in front of me to test, but the functionality is provided by CreateFileMapping() and MapViewOfFile().
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String concatenation in Ruby
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The + operator is the normal concatenation choice, and is probably the fastest way to concatenate strings.
The difference between + and << is that << changes the object on its left hand side, and + doesn't.
irb(main):001:0> s = 'a'
=> "a"
irb(main):002:0> s + 'b'
=> "ab"
i...
Join/Where with LINQ and Lambda
...IN condition; you don't need to use WHERE clause!": the WHERE clause isn't testing equality between ID fields, it's testing equality between the post ID column and the id parameter declared outside the query.
– Daniel Schaffer
May 27 '13 at 15:45
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How do I base64 encode (decode) in C?
...mplementation performs well in C++, it can easily be backported to C. Also tests were conducted using Visual Studio 2015. If somebody wants to update this answer with results from clang/gcc, be my guest.
FASTEST ENCODERS:
The two fastest encoder implementations I found were Jouni Malinen's at http...
How to create Android Facebook Key Hash?
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Sounds correct. Just tested it on my machine, was 28 chars long for me, just to give you an idea. Now just copy it over and you're fine. :)
– user658042
Sep 21 '11 at 21:10
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