可以使用AF_ALG进行压缩，以下是一个使用AF_ALG进行zlib压缩和解压缩的示例代码：

压缩：

#include 
#include 
#include 
#include 
#include 
#include 

#define BUFSIZE 4096

int zlib_compress(int algfd, const uint8_t *src, size_t srclen, uint8_t *dst, size_t *dstlen) {
    int ret = -1;
    unsigned char buffer[BUFSIZE];
    z_stream zs;
    memset(&zs, 0, sizeof(zs));
    zs.zalloc = Z_NULL;
    zs.zfree = Z_NULL;
    zs.opaque = Z_NULL;
    if (deflateInit(&zs, Z_DEFAULT_COMPRESSION) != Z_OK) {
        printf("deflateInit error.\n");
        goto exit;
    }
    zs.next_in = (Bytef *)src;
    zs.avail_in = srclen;
    while (zs.avail_in > 0) {
        zs.next_out = buffer;
        zs.avail_out = BUFSIZE;
        int ret = deflate(&zs, Z_NO_FLUSH);
        if (ret == Z_STREAM_ERROR || (ret == Z_BUF_ERROR && zs.avail_in != 0)) {
            printf("deflate error.\n");
            goto cleanup;
        }
        size_t have = BUFSIZE - zs.avail_out;
        if (write(algfd, buffer, have) != have) {
            printf("write error.\n");
            goto cleanup;
        }
    }
    for (;;) {
        zs.next_out = buffer;
        zs.avail_out = BUFSIZE;
        ret = deflate(&zs, Z_FINISH);
        if (ret == Z_STREAM_ERROR || (ret == Z_BUF_ERROR && zs.avail_in != 0)) {
            printf("deflate error.\n");
            goto cleanup;
        }
        size_t have = BUFSIZE - zs.avail_out;
        if (write(algfd, buffer, have) != have) {
            printf("write error.\n");
            goto cleanup;
        }
        if (ret == Z_STREAM_END) {