linux 安装 zlib

sudo apt update
sudo apt install zlib1g-dev

sudo yum install zlib-devel

sudo dnf install zlib-devel

sudo pacman -S zlib

zlib-flate -version

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

void compress_data(const char *input, size_t input_len, unsigned char **output, size_t *output_len) {
    *output_len = compressBound(input_len);
    *output = (unsigned char *)malloc(*output_len);
    compress2(*output, output_len, (const Bytef *)input, input_len, Z_DEFAULT_COMPRESSION);
}

int main() {
    const char *input = "Hello, World!";
    size_t input_len = strlen(input);
    unsigned char *compressed_data;
    size_t compressed_len;

    compress_data(input, input_len, &compressed_data, &compressed_len);

    printf("Compressed data length: %zu\n", compressed_len);
    free(compressed_data);
    return 0;
}

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

void decompress_data(const unsigned char *input, size_t input_len, unsigned char **output, size_t *output_len) {
    *output_len = 100; // 假设解压后的数据长度不超过100
    *output = (unsigned char *)malloc(*output_len);
    uncompress(*output, output_len, input, input_len);
}

int main() {
    const unsigned char compressed_data[] = { /* 压缩后的数据 */ };
    size_t compressed_len = sizeof(compressed_data);
    unsigned char *decompressed_data;
    size_t decompressed_len;

    decompress_data(compressed_data, compressed_len, &decompressed_data, &decompressed_len);

    printf("Decompressed data: %.*s\n", (int)decompressed_len, decompressed_data);
    free(decompressed_data);
    return 0;
}