pack

Trying to reproduce PHP's pack(“H*”) function in C#

由 陌路散爱 提交于 2021-02-08 05:49:14
问题 this is my code in C# : public static String MD5Encrypt(String str, Boolean raw_output=false) { // Use input string to calculate MD5 hash String output; MD5 md5 = System.Security.Cryptography.MD5.Create(); byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(str); byte[] hashBytes = md5.ComputeHash(inputBytes); // Convert the byte array to hexadecimal string StringBuilder sb = new StringBuilder(); for (int i = 0; i < hashBytes.Length; i++) { sb.Append(hashBytes[i].ToString("x2")); } output

Going faster than struct.pack with cython

由 时光总嘲笑我的痴心妄想 提交于 2021-02-08 05:15:17
问题 I'm trying to do better than struct.pack . Taking a specific case of packing integeres, via the answer to this question, I have the following to pack a list of ints in pack_ints.pyx : # cython: language_level=3, boundscheck=False import cython @cython.boundscheck(False) @cython.wraparound(False) def pack_ints(int_col): int_buf = bytearray(4*len(int_col)) cdef int[::1] buf_view = memoryview(int_buf).cast('i') idx: int = 0 for idx in range(len(int_col)): buf_view[idx] = int_col[idx] return int

AVX2 byte gather with uint16 indices, into a __m256i

由 冷暖自知 提交于 2021-02-07 13:30:20
问题 I am trying to pack a __m256i variable with 32 chars from an array and specified by indices. here is my code: char array[]; // different array every time. uint16_t offset[32]; // same offset reused many times _mm256_set_epi8(array[offset[0]], array[offset[1]], array[offset[2]], array[offset[3]], array[offset[4]], array[offset[5]], array[offset[6]], array[offset[7]], array[offset[8]],array[offset[9]],array[offset[10]],array[offset[11]], array[offset[12]], array[offset[13]], array[offset[14]],

AVX2 byte gather with uint16 indices, into a __m256i

由 走远了吗. 提交于 2021-02-07 13:28:26
问题 I am trying to pack a __m256i variable with 32 chars from an array and specified by indices. here is my code: char array[]; // different array every time. uint16_t offset[32]; // same offset reused many times _mm256_set_epi8(array[offset[0]], array[offset[1]], array[offset[2]], array[offset[3]], array[offset[4]], array[offset[5]], array[offset[6]], array[offset[7]], array[offset[8]],array[offset[9]],array[offset[10]],array[offset[11]], array[offset[12]], array[offset[13]], array[offset[14]],

python3 tkinter grid and pack, inline packing syntax & elegance

由 本小妞迷上赌 提交于 2021-02-05 08:07:03
问题 What's the difference between packing a frame "in line" versus ='ing it to a variable and .pack'ing it on the next line? So I saw how to do grid and pack at the same time (see here), but after playing around with it, I ran into something weird. If you change line 16/17 from: f5 = Frame(mainF, bg = "yellow", height=100, width = 60) f5.pack(side=BOTTOM,fill=NONE) to: f5 = Frame(mainF, bg = "yellow", height=100, width = 60).pack(side=BOTTOM,fill=NONE) At the end of the code where the buttons get

python3 tkinter grid and pack, inline packing syntax & elegance

由 ∥☆過路亽．° 提交于 2021-02-05 08:06:51
问题 What's the difference between packing a frame "in line" versus ='ing it to a variable and .pack'ing it on the next line? So I saw how to do grid and pack at the same time (see here), but after playing around with it, I ran into something weird. If you change line 16/17 from: f5 = Frame(mainF, bg = "yellow", height=100, width = 60) f5.pack(side=BOTTOM,fill=NONE) to: f5 = Frame(mainF, bg = "yellow", height=100, width = 60).pack(side=BOTTOM,fill=NONE) At the end of the code where the buttons get

php 的pack方法 归纳总结

由 落花浮王杯 提交于 2021-01-20 22:52:27
今天在弄这个pack方法，但是真不知道如何写下来，感觉很纷乱 pack--压缩资料到位字符串之中。 语法：string pack(string format, mixed [args]...); 参数一：format参数表示资料用什么方式读取到 参数二：将要压缩的资料。 参数一 的种类 a 将字符串空白以 NULL 字符填满 A 将字符串空白以 SPACE 字符 (空格) 填满 h 十六进位字符串，低位在前 H 十六进位字符串，高位在前 c 有号字符 C 无号字符 s 有号短整数 (十六位，依计算机的位顺序) S 无号短整数 (十六位，依计算机的位顺序) n 无号短整数 (十六位, 高位在后的顺序) v 无号短整数 (十六位, 低位在后的顺序) i 有号整数 (依计算机的顺序及范围) I 无号整数 (依计算机的顺序及范围) l 有号长整数 (卅二位，依计算机的位顺序) L 无号长整数 (卅二位，依计算机的位顺序) N 无号短整数 (卅二位, 高位在后的顺序) V 无号短整数 (卅二位, 低位在后的顺序) f 单精确浮点数 (依计算机的范围) d 倍精确浮点数 (依计算机的范围) x 空位 X 倒回一位 @ 填入 NULL 字符到绝对位置 上面参数一得总结来自于网络，不知道是哪个翻译翻得，总之我个人不推荐看。下面是php手册上面的内容（全英文的，虽然我也看不懂

Ruby's pack and unpack explained

由 北城余情 提交于 2021-01-20 19:31:17
问题 Even after reading the standard documentation, I still can't understand how Ruby's Array#pack and String#unpack exactly work. Here is the example that's causing me the most trouble: irb(main):001:0> chars = ["61","62","63"] => ["61", "62", "63"] irb(main):002:0> chars.pack("H*") => "a" irb(main):003:0> chars.pack("HHH") => "```" I expected both these operations to return the same output: "abc". Each of them "fails" in a different manner (not really a fail since I probably expect the wrong

c++ Unpacking parameter pack from template arguments

由 限于喜欢 提交于 2020-05-13 05:44:06
问题 How to achieve want I want below? The paramater pack I want to unpack is not in a function argument list but template argument list. #include <iostream> #include <array> const std::size_t SIZE = 10; template <int...ARGS> std::array<bool, SIZE> func() { std::array<bool, SIZE> b; // I want to set b[n] = true, where n takes on all values from ARGS... // what to put in here??? return b; } // Example of what I want to achieve: int main() { const std::array<bool, SIZE> b = func<1,3,7>(); // I want
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