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问题 I'm trying to write the following Java code in Swift: private static final byte[] ENCRYPTION_KEY = new byte[] { 'N', 'r', 'q', 'V', '2', 'h', 'V', 'j', 'z', 'D', 'N', 'p', 'V', 'T', '3', 'X' }; private static final byte[] VECTOR = new byte[] { 'f', 'e', 'l', 'c', 'd', 'a', '1', '8', '7', '2', '5', '4', '3', '2', '8', '0' }; How can this be done? 回答1: You can simply add those characters into a String and use that string utf8 property to initialize a new array of bytes from it. The result will

问题 I have this cmap table roughly: { name: 'cmap', fields: { version: { type: 'USHORT', value: 0 }, numTables: { type: 'USHORT', value: 1 }, platformID: { type: 'USHORT', value: 0 }, encodingID: { type: 'USHORT', value: 6 }, offset: { type: 'ULONG', value: 12 }, format: { type: 'USHORT', value: 4 }, cmap4Length: { type: 'USHORT', value: 16 }, language: { type: 'USHORT', value: 0 }, segCountX2: { type: 'USHORT', value: 126 }, searchRange: { type: 'USHORT', value: 64 }, entrySelector: { type:

问题 This is more for practice than anything, really. I am having the most frustrating time with this as it's a fairly new concept to me. I will post my code below. What I am attempting to do: Read a file into a byte array Split the byte into pars of a predefined size Put the parts back together, and write the file to HD byte[] sData = File.ReadAllBytes(@"C:\Project1.exe"); // 16,384 bytes // Split the data up here int range = 8; range *= 1024; int pos = 0; int remaining; int i = 0; byte[] test =

问题 I am trying to implement a steganography. I am reading an image "a.jpeg" and inserting a byte in it by changing its consecutive 7 bytes at the least significant bit starting from offset 50. This is done successfully as when I print the bytes the last bits are changed accordingly. Then I saved it as "ao.jpeg". But when I am reading the byte values from 50, they are not the same as the once i saved. here's my code public static void main(String[] args) throws IOException { BufferedImage

问题 I have implemented a class for Huffman coding. The class will parse an input file and build a huffman tree from it and creates a map which has each of the distinct characters appeared in the file as the key and the huffman code of the character as its value. For example, let the string "aravind_is_a_good_boy" be the only line in the file. When you build the huffman tree and generate the huffman code for each character, we can see that, for the character 'a', the huffman code is '101' and for

问题 I am making a calculator-type program, and I use this to get a number from the user and store it: mov ah, 01h int 21h mov offset num1, al and at the end of the code I have num1 set up as a byte with num1 db 0 giving it a default value of 0. The problem is, when I try to move the value from num1 back into a register to perform the actual operation: mov bl, offset num1 I get an error saying the second operand is over 8 bits, and I cannot figure this out through any searching of the internet

问题 I've a Public key converted to byte array. I want to convert it back to Public key. I followed this link but getting an error : Operation failed: javax.crypto.spec.SecretKeySpec incompatible with java.security.PublicKey Since I know that it is a public key, is there any to convert it to Publickey instead of SecretKey . EDIT I have created a public key using RSAPublicKeySPec . Now there is no error but the signature verification fails because when I see the key material of the newly created

问题 To retrieve the uncompressed size of a file that is compressed via gzip, you can read the last four bytes. I am doing this to see if there are any files that are not the size they are supposed to be. If a file is smaller than it should be, I use this code to append to the file: GZIPOutputStream gzipoutput = new GZIPOutputStream (new FileOutputStream(file, true)); while ((len=bs.read(buf)) >= 0) { gzipoutput.write(buf, 0, len); } gzipoutput.finish(); gzipoutput.close(); Of course, this appends

问题 I need to convert integer to a 4 byte (32 bit) hex for sending it as ACK to a device i am currently trying to integrate. For example 3 = 00000003 15 = 0000000F Check http://www.mathsisfun.com/binary-decimal-hexadecimal-converter.html 1. Select signed 32 bit from the dropdown 2. Enter the value in decomal text box 3. Check value in hex field. I am using php pack function with this parameter but based on the response from the device, it does not seem to be the correct approach. $reply = pack(L*

问题 How much memory do i need to load 100 million records in to memory. Suppose each record needs 7 bytes. Here is my calculation each record = <int> <short> <byte> 4 + 2 + 1 = 7 bytes needed memory in GB = 7 * 100 * 1,000,000 / 1000,000,000 = 0.7 GB Do you see any problem with this calculation? 回答1: With 100,000,000 records, you need to allow for overhead. Exactly what and how much overhead you'll have will depend on the language. In C/C++, for example, fields in a structure or class are aligned