On Debian and other Linux distros is installed by default (along with vim) the xxd tool, which, given the -i option, can do what you want: matteo@teodeb:~/Desktop$ echo Hello World\! > temp matteo@teodeb:~/Desktop$ xxd -i temp unsigned char temp[] = { 0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x0a }; … Read more
You can do that with the struct package: import struct def binary(num): return ”.join(‘{:0>8b}’.format(c) for c in struct.pack(‘!f’, num)) That packs it as a network byte-ordered float, and then converts each of the resulting bytes into an 8-bit binary representation and concatenates them out: >>> binary(1) ‘00111111100000000000000000000000’ Edit: There was a request to expand the … Read more
Create a response object with the data and then set the content type header. Set the content disposition header to attachment if you want the browser to save the file instead of displaying it. @app.route(‘/images/<int:pid>.jpg’) def get_image(pid): image_binary = read_image(pid) response = make_response(image_binary) response.headers.set(‘Content-Type’, ‘image/jpeg’) response.headers.set( ‘Content-Disposition’, ‘attachment’, filename=”%s.jpg” % pid) return response Relevant: werkzeug.Headers … Read more
For ASCII characters in the range [ -~] on Python 2: >>> import binascii >>> bin(int(binascii.hexlify(‘hello’), 16)) ‘0b110100001100101011011000110110001101111’ In reverse: >>> n = int(‘0b110100001100101011011000110110001101111’, 2) >>> binascii.unhexlify(‘%x’ % n) ‘hello’ In Python 3.2+: >>> bin(int.from_bytes(‘hello’.encode(), ‘big’)) ‘0b110100001100101011011000110110001101111’ In reverse: >>> n = int(‘0b110100001100101011011000110110001101111’, 2) >>> n.to_bytes((n.bit_length() + 7) // 8, ‘big’).decode() ‘hello’ To support all … Read more
The read method returns a sequence of bytes as a string. To convert from a string byte-sequence to binary data, use the built-in struct module: http://docs.python.org/library/struct.html. import struct print(struct.unpack(‘i’, fin.read(4))) Note that unpack always returns a tuple, so struct.unpack(‘i’, fin.read(4))[0] gives the integer value that you are after. You should probably use the format string … Read more
Updated Answer for Node.js ~>0.8 Node is able to concatenate buffers on its own now. var newBuffer = Buffer.concat([buffer1, buffer2]); Old Answer for Node.js ~0.6 I use a module to add a .concat function, among others: https://github.com/coolaj86/node-bufferjs I know it isn’t a “pure” solution, but it works very well for my purposes.
The strconv package has FormatInt, which accepts an int64 and lets you specify the base. n := int64(123) fmt.Println(strconv.FormatInt(n, 2)) // 1111011 DEMO: http://play.golang.org/p/leGVAELMhv http://golang.org/pkg/strconv/#FormatInt func FormatInt(i int64, base int) string FormatInt returns the string representation of i in the given base, for 2 <= base <= 36. The result uses the lower-case letters ‘a’ … Read more
That’s the Hamming weight problem, a.k.a. population count. The link mentions efficient implementations. Quoting: With unlimited memory, we could simply create a large lookup table of the Hamming weight of every 64 bit integer
std::bitset has a .to_string() method that returns a std::string holding a text representation in binary, with leading-zero padding. Choose the width of the bitset as needed for your data, e.g. std::bitset<32> to get 32-character strings from 32-bit integers. #include <iostream> #include <bitset> int main() { std::string binary = std::bitset<8>(128).to_string(); //to binary std::cout<<binary<<“\n”; unsigned long decimal … Read more
I answered this elsewhere, and will copy here since I’m proud of it! … and without further ado, may I present to you this useful script, git-gc-all, guaranteed to remove all your git garbage until they might come up with extra config variables: git -c gc.reflogExpire=0 -c gc.reflogExpireUnreachable=0 \ -c gc.rerereresolved=0 -c gc.rerereunresolved=0 \ -c … Read more