linux下zlib api

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

int compress_data(const char *src, int src_len, char *dst, int dst_len) {
    z_stream stream;
    memset(&stream, 0, sizeof(stream));
    stream.next_in = (Bytef *)src;
    stream.avail_in = src_len;
    stream.next_out = (Bytef *)dst;
    stream.avail_out = dst_len;

    int ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
    if (ret != Z_OK) {
        return ret;
    }

    ret = deflate(&stream, Z_FINISH);
    if (ret != Z_STREAM_END) {
        deflateEnd(&stream);
        return ret == Z_OK ? Z_BUF_ERROR : ret;
    }

    deflateEnd(&stream);
    return stream.total_out;
}

int main() {
    const char *src = "Hello, world!";
    int src_len = strlen(src);
    char dst[src_len];
    int dst_len = compress_data(src, src_len, dst, sizeof(dst));
    printf("Compressed data length: %d\n", dst_len);
    return 0;
}

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

int decompress_data(const char *src, int src_len, char *dst, int dst_len) {
    z_stream stream;
    memset(&stream, 0, sizeof(stream));
    stream.next_in = (Bytef *)src;
    stream.avail_in = src_len;
    stream.next_out = (Bytef *)dst;
    stream.avail_out = dst_len;

    int ret = inflateInit(&stream);
    if (ret != Z_OK) {
        return ret;
    }

    ret = inflate(&stream, Z_FINISH);
    if (ret != Z_STREAM_END) {
        inflateEnd(&stream);
        return ret == Z_OK ? Z_BUF_ERROR : ret;
    }

    inflateEnd(&stream);
    return stream.total_out;
}

int main() {
    const char *src = "Hello, world!"; // 假设这是压缩后的数据
    int src_len = strlen(src);
    char dst[100];
    int dst_len = decompress_data(src, src_len, dst, sizeof(dst));
    printf("Decompressed data length: %d\n", dst_len);
    return 0;
}