admin 管理员组

文章数量: 1086019


2024年3月13日发(作者:linux系统安装教程全版学习)

c++压缩实例

在 C++ 中,常见的压缩和解压缩库有 zlib、gzip、zstd 等。下面是一个使用 zlib 进行压缩

和解压缩的简单示例。请注意,为了运行这个示例,你需要安装 zlib 库,并在编译时链接 zlib

库。

```cpp

#include

#include

#include

// 压缩函数

std::string compress(const std::string& data) {

z_stream zs; // zlib 的数据结构

memset(&zs, 0, sizeof(zs));

if (deflateInit(&zs, Z_BEST_COMPRESSION) != Z_OK) {

throw std::runtime_error("deflateInit failed while compressing.");

}

_in = (Bytef*)();

_in = ();

int ret;

char outbuffer[32768];

std::string outstring;

do {

_out = reinterpret_cast(outbuffer);

_out = sizeof(outbuffer);

ret = deflate(&zs, Z_FINISH);

if (() < _out) {

(outbuffer, _out - ());

}

} while (ret == Z_OK);

deflateEnd(&zs);

if (ret != Z_STREAM_END) {

throw std::runtime_error("Exception during zlib compression: (" + std::to_string(ret) +

")");

}

return outstring;

}

// 解压函数

std::string decompress(const std::string& compressed) {

z_stream zs;

memset(&zs, 0, sizeof(zs));

if (inflateInit(&zs) != Z_OK) {

throw std::runtime_error("inflateInit failed while decompressing.");

}

_in = (Bytef*)();

_in = ();

int ret;

char outbuffer[32768];

std::string outstring;

do {

_out = reinterpret_cast(outbuffer);

_out = sizeof(outbuffer);

ret = inflate(&zs, 0);

if (() < _out) {

(outbuffer, _out - ());

}

} while (ret == Z_OK);

inflateEnd(&zs);

if (ret != Z_STREAM_END) {

throw std::runtime_error("Exception during zlib decompression: (" + std::to_string(ret)

+ ")");

}

return outstring;

}

int main() {

std::string originalData = "Hello, this is a sample string for compression and

decompression.";

std::string compressedData = compress(originalData);

std::cout << "Compressed data: " << compressedData << std::endl;

std::string decompressedData = decompress(compressedData);

std::cout << "Decompressed data: " << decompressedData << std::endl;

return 0;

}

```

这个例子中使用了 zlib 库进行压缩和解压缩。请确保在你的环境中安装了 zlib 库,并在编

译时链接该库。这只是一个简单的示例,实际使用中可能需要更多的错误处理和边界检查。


本文标签: 安装 使用 示例 压缩 需要