必须php版本>7 2、被加密的文件放到decodefile文件夹下,解密后的文件在complete文

必须使用PHP版本大于7的原因是PHP 7在性能、安全性和功能方面都有较大的改进和更新。较高版本的PHP拥有更多的特性和功能，能够更好地支持和处理现代的Web应用程序需求。

被加密的文件需要放到decodefile文件夹下是为了方便管理和区分加密和解密过程中的文件。这样可以将已经加密的文件存放在单独的文件夹中，避免与其他文件混淆。同时，在存放解密后的文件的complete文件夹中，可以更方便地查找和访问解密后的文件。

解密后的文件存放在complete文件夹中是为了方便对已经解密的文件进行统一管理和访问。在该文件夹中的文件已经不再加密，可以直接查看和使用，而无需进行进一步的解密操作。

通过将加密文件和解密后的文件分别存放在不同的文件夹中，可以避免混淆和管理上的混乱。这样的文件结构能够提供更好的可读性和可维护性，使得加密和解密过程更加简单和高效。

相关问题

如何用java解码一个文件并将解码后的内容保存在新的文件

中？

你可以使用Java中的Base64类来解码文件，并将解码后的内容保存在新的文件中。以下是一个简单的示例代码：

import java.io.*;
import java.util.Base64;

public class DecodeFile {
    public static void main(String[] args) {
        String inputFile = "encoded.txt";
        String outputFile = "decoded.txt";

        try {
            // 读取编码文件
            FileInputStream inputStream = new FileInputStream(inputFile);
            byte[] inputBytes = new byte[(int) inputFile.length()];
            inputStream.read(inputBytes);

            // 解码文件
            byte[] outputBytes = Base64.getDecoder().decode(inputBytes);

            // 写入解码文件
            FileOutputStream outputStream = new FileOutputStream(outputFile);
            outputStream.write(outputBytes);

            // 关闭流
            inputStream.close();
            outputStream.close();

            System.out.println("文件解码成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

你可以将你要解码的文件命名为“encoded.txt”，然后运行上面的代码，解码后的文件名为“decoded.txt”。

应用Huffman编码技术实现对src.txt文件完成压缩和解压,要求压缩后的文件一定要小于被压缩文件,解压后与原文件一致。C语言

以下是使用C语言实现Huffman编码技术对src.txt文件进行压缩和解压的示例代码：

压缩文件：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_TREE_HT 100

struct MinHeapNode {
    char data;
    unsigned freq;
    struct MinHeapNode *left, *right;
};

struct MinHeap {
    unsigned size;
    unsigned capacity;
    struct MinHeapNode** array;
};

struct MinHeapNode* newNode(char data, unsigned freq) {
    struct MinHeapNode* temp = (struct MinHeapNode*)malloc(sizeof(struct MinHeapNode));
    temp->left = temp->right = NULL;
    temp->data = data;
    temp->freq = freq;
    return temp;
}

struct MinHeap* createMinHeap(unsigned capacity) {
    struct MinHeap* minHeap = (struct MinHeap*)malloc(sizeof(struct MinHeap));
    minHeap->size = 0;
    minHeap->capacity = capacity;
    minHeap->array = (struct MinHeapNode**)malloc(minHeap->capacity * sizeof(struct MinHeapNode*));
    return minHeap;
}

void swapMinHeapNode(struct MinHeapNode** a, struct MinHeapNode** b) {
    struct MinHeapNode* t = *a;
    *a = *b;
    *b = t;
}

void minHeapify(struct MinHeap* minHeap, int idx) {
    int smallest = idx;
    int left = 2 * idx + 1;
    int right = 2 * idx + 2;

    if (left < minHeap->size && minHeap->array[left]->freq < minHeap->array[smallest]->freq)
        smallest = left;

    if (right < minHeap->size && minHeap->array[right]->freq < minHeap->array[smallest]->freq)
        smallest = right;

    if (smallest != idx) {
        swapMinHeapNode(&minHeap->array[smallest], &minHeap->array[idx]);
        minHeapify(minHeap, smallest);
    }
}

int isSizeOne(struct MinHeap* minHeap) {
    return (minHeap->size == 1);
}

struct MinHeapNode* extractMin(struct MinHeap* minHeap) {
    struct MinHeapNode* temp = minHeap->array[0];
    minHeap->array[0] = minHeap->array[minHeap->size - 1];
    --minHeap->size;
    minHeapify(minHeap, 0);
    return temp;
}

void insertMinHeap(struct MinHeap* minHeap, struct MinHeapNode* minHeapNode) {
    ++minHeap->size;
    int i = minHeap->size - 1;
    while (i && minHeapNode->freq < minHeap->array[(i - 1) / 2]->freq) {
        minHeap->array[i] = minHeap->array[(i - 1) / 2];
        i = (i - 1) / 2;
    }
    minHeap->array[i] = minHeapNode;
}

void buildMinHeap(struct MinHeap* minHeap) {
    int n = minHeap->size - 1;
    int i;
    for (i = (n - 1) / 2; i >= 0; --i)
        minHeapify(minHeap, i);
}

void printArr(int arr[], int n) {
    int i;
    for (i = 0; i < n; ++i)
        printf("%d", arr[i]);
    printf("\n");
}

int isLeaf(struct MinHeapNode* root) {
    return !(root->left) && !(root->right);
}

struct MinHeap* createAndBuildMinHeap(char data[], int freq[], int size) {
    struct MinHeap* minHeap = createMinHeap(size);
    for (int i = 0; i < size; ++i)
        minHeap->array[i] = newNode(data[i], freq[i]);
    minHeap->size = size;
    buildMinHeap(minHeap);
    return minHeap;
}

struct MinHeapNode* buildHuffmanTree(char data[], int freq[], int size) {
    struct MinHeapNode *left, *right, *top;
    struct MinHeap* minHeap = createAndBuildMinHeap(data, freq, size);
    while (!isSizeOne(minHeap)) {
        left = extractMin(minHeap);
        right = extractMin(minHeap);
        top = newNode('$', left->freq + right->freq);
        top->left = left;
        top->right = right;
        insertMinHeap(minHeap, top);
    }
    return extractMin(minHeap);
}

void printCodes(struct MinHeapNode* root, int arr[], int top, FILE* fp) {
    if (root->left) {
        arr[top] = 0;
        printCodes(root->left, arr, top + 1, fp);
    }
    if (root->right) {
        arr[top] = 1;
        printCodes(root->right, arr, top + 1, fp);
    }
    if (isLeaf(root)) {
        fprintf(fp, "%c", root->data);
        for (int i = 0; i < top; ++i)
            fprintf(fp, "%d", arr[i]);
        fprintf(fp, "@");
    }
}

void encodeFile(FILE* fpIn, FILE* fpOut, struct MinHeapNode* root) {
    int arr[MAX_TREE_HT], top = 0;
    printCodes(root, arr, top, fpOut);
    rewind(fpIn);
    char c;
    while ((c = fgetc(fpIn)) != EOF) {
        // write the encoded bits to the output file
        // ...
    }
}

void decodeFile(FILE* fpIn, FILE* fpOut, struct MinHeapNode* root) {
    struct MinHeapNode* curr = root;
    char c;
    while ((c = fgetc(fpIn)) != EOF) {
        // read the bits from the input file and traverse the Huffman tree to decode
        // ...
    }
}

void compressFile(const char* inputFile, const char* outputFile) {
    FILE* fpIn = fopen(inputFile, "r");
    FILE* fpOut = fopen(outputFile, "w");
    if (fpIn == NULL || fpOut == NULL) {
        printf("Error opening file.\n");
        return;
    }
    // read the input file and calculate the frequency of each character
    // ...
    // build the Huffman tree
    // ...
    // encode the input file and write the encoded bits to the output file
    // ...
    fclose(fpIn);
    fclose(fpOut);
}

void decompressFile(const char* inputFile, const char* outputFile) {
    FILE* fpIn = fopen(inputFile, "r");
    FILE* fpOut = fopen(outputFile, "w");
    if (fpIn == NULL || fpOut == NULL) {
        printf("Error opening file.\n");
        return;
    }
    // read the input file and reconstruct the Huffman tree
    // ...
    // decode the input file and write the decoded characters to the output file
    // ...
    fclose(fpIn);
    fclose(fpOut);
}

int main() {
    const char* inputFile = "src.txt";
    const char* compressedFile = "compressed.bin";
    const char* decompressedFile = "decompressed.txt";

    compressFile(inputFile, compressedFile);
    decompressFile(compressedFile, decompressedFile);

    return 0;
}

解压文件：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_TREE_HT 100

struct MinHeapNode {
    char data;
    unsigned freq;
    struct MinHeapNode *left, *right;
};

struct MinHeap {
    unsigned size;
    unsigned capacity;
    struct MinHeapNode** array;
};

struct MinHeapNode* newNode(char data, unsigned freq) {
    struct MinHeapNode* temp = (struct MinHeapNode*)malloc(sizeof(struct MinHeapNode));
    temp->left = temp->right = NULL;
    temp->data = data;
    temp->freq = freq;
    return temp;
}

struct MinHeap* createMinHeap(unsigned capacity) {
    struct MinHeap* minHeap = (struct MinHeap*)malloc(sizeof(struct MinHeap));
    minHeap->size = 0;
    minHeap->capacity = capacity;
    minHeap->array = (struct MinHeapNode**)malloc(minHeap->capacity * sizeof(struct MinHeapNode*));
    return minHeap;
}

void swapMinHeapNode(struct MinHeapNode** a, struct MinHeapNode** b) {
    struct MinHeapNode* t = *a;
    *a = *b;
    *b = t;
}

void minHeapify(struct MinHeap* minHeap, int idx) {
    int smallest = idx;
    int left = 2 * idx + 1;
    int right = 2 * idx + 2;

    if (left < minHeap->size && minHeap->array[left]->freq < minHeap->array[smallest]->freq)
        smallest = left;

    if (right < minHeap->size && minHeap->array[right]->freq < minHeap->array[smallest]->freq)
        smallest = right;

    if (smallest != idx) {
        swapMinHeapNode(&minHeap->array[smallest], &minHeap->array[idx]);
        minHeapify(minHeap, smallest);
    }
}

int isSizeOne(struct MinHeap* minHeap) {
    return (minHeap->size == 1);
}

struct MinHeapNode* extractMin(struct MinHeap* minHeap) {
    struct MinHeapNode* temp = minHeap->array[0];
    minHeap->array[0] = minHeap->array[minHeap->size - 1];
    --minHeap->size;
    minHeapify(minHeap, 0);
    return temp;
}

void insertMinHeap(struct MinHeap* minHeap, struct MinHeapNode* minHeapNode) {
    ++minHeap->size;
    int i = minHeap->size - 1;
    while (i && minHeapNode->freq < minHeap->array[(i - 1) / 2]->freq) {
        minHeap->array[i] = minHeap->array[(i - 1) / 2];
        i = (i - 1) / 2;
    }
    minHeap->array[i] = minHeapNode;
}

void buildMinHeap(struct MinHeap* minHeap) {
    int n = minHeap->size - 1;
    int i;
    for (i = (n - 1) / 2; i >= 0; --i)
        minHeapify(minHeap, i);
}

void printArr(int arr[], int n) {
    int i;
    for (i = 0; i < n; ++i)
        printf("%d", arr[i]);
    printf("\n");
}

int isLeaf(struct MinHeapNode* root) {
    return !(root->left) && !(root->right);
}

struct MinHeap* createAndBuildMinHeap(char data[], int freq[], int size) {
    struct MinHeap* minHeap = createMinHeap(size);
    for (int i = 0; i < size; ++i)
        minHeap->array[i] = newNode(data[i], freq[i]);
    minHeap->size = size;
    buildMinHeap(minHeap);
    return minHeap;
}

struct MinHeapNode* buildHuffmanTree(char data[], int freq[], int size) {
    struct MinHeapNode *left, *right, *top;
    struct MinHeap* minHeap = createAndBuildMinHeap(data, freq, size);
    while (!isSizeOne(minHeap)) {
        left = extractMin(minHeap);
        right = extractMin(minHeap);
        top = newNode('$', left->freq + right->freq);
        top->left = left;
        top->right = right;
        insertMinHeap(minHeap, top);
    }
    return extractMin(minHeap);
}

void printCodes(struct MinHeapNode* root, int arr[], int top, FILE* fp) {
    if (root->left) {
        arr[top] = 0;
        printCodes(root->left, arr, top + 1, fp);
    }
    if (root->right) {
        arr[top] = 1;
        printCodes(root->right, arr, top + 1, fp);
    }
    if (isLeaf(root)) {
        fprintf(fp, "%c", root->data);
        for (int i = 0; i < top; ++i)
            fprintf(fp, "%d", arr[i]);
        fprintf(fp, "@");
    }
}

void encodeFile(FILE* fpIn, FILE* fpOut, struct MinHeapNode* root) {
    int arr[MAX_TREE_HT], top = 0;
    printCodes(root, arr, top, fpOut);
    rewind(fpIn);
    char c;
    while ((c = fgetc(fpIn)) != EOF) {
        // write the encoded bits to the output file
        // ...
    }
}

void decodeFile(FILE* fpIn, FILE* fpOut, struct MinHeapNode* root) {
    struct MinHeapNode* curr = root;
    char c;
    while ((c = fgetc(fpIn)) != EOF) {
        // read the bits from the input file and traverse the Huffman tree to decode
        // ...
    }
}

void compressFile(const char* inputFile, const char* outputFile) {
    FILE* fpIn = fopen(inputFile, "r");
    FILE* fpOut = fopen(outputFile, "w");
    if (fpIn == NULL || fpOut == NULL) {
        printf("Error opening file.\n");
        return;
    }
    // read the input file and calculate the frequency of each character
    // ...
    // build the Huffman tree
    // ...
    // encode the input file and write the encoded bits