基于libcurl+libopenssl开源库编译出curl下载工具及代码集成curl功能

准备素材：

1. openssl的版本： openssl-1.1.1w.tar.gz

2.curl的版本：curl-8.4.0.tar.gz

目标：

1.编译出openssl库；

2.编译出curl可执行文件及库；

步骤一：先解压压缩包

tar -zxvf openssl-1.1.1w.tar.gz

tar -zxvf curl-8.4.0.tar.gz

步骤二：编译openssl

首先需要配置config：

CC=/home/desheng/asj/ts-sdk/prebuilts/host/gcc/gcc-ts-10.3-2023.2-x86_64-arm-none-linux-uclibcgnueabihf/bin/arm-ts-linux-uclibcgnueabihf-gcc ./config no-asm no-shared no-async --prefix=/home/desheng/asj/libopenssl-out

CC就是编译器的路径， --prefix就是编译出的库文件及可执行文件存放的位置；no-shared表示编译出静态库

no-asm
                   Do not use assembler code. This should be viewed as
                   debugging/trouble-shooting option rather than production.
                   On some platforms a small amount of assembler code may
                   still be used even with this option.

  no-async
                   Do not build support for async operations.

再执行make;由于使用的是32bit的编译器，因此makefile里面产生的-m64需要去掉一下，等待编译完成后再安装，执行make install;

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步骤三：编译curl库

首先还是需要配置：

CPPFLAGS="-I/home/desheng/asj/libopenssl-out/lib/ -I/home/desheng/asj/libopenssl-out/include" LDFLAGS="-L/home/desheng/asj/libopenssl-out/lib" LIBS="-ldl -lssl -lcrypto" ./configure --host=arm-linux CC=/home/desheng/asj/ts-sdk/prebuilts/host/gcc/gcc-ts-10.3-2023.2-x86_64-arm-none-linux-uclibcgnueabihf/bin/arm-ts-linux-uclibcgnueabihf-gcc CXX=/home/desheng/asj/ts-sdk/prebuilts/host/gcc/gcc-ts-10.3-2023.2-x86_64-arm-none-linux-uclibcgnueabihf/bin/arm-ts-linux-uclibcgnueabihf-g++ --with-ssl --enable-static --disable-dict --disable-ftp --disable-imap --disable-ldap --disable-ldaps --disable-pop3 --disable-proxy --disable-rtsp --disable-smtp --disable-telnet --disable-tftp --disable-zlib --without-ca-bundle --without-gnutls --without-libidn --without-librtmp --without-libssh2 --without-nss --without-zlib --prefix=/home/desheng/asj/libcurl-out/

指定好openssl的头文件，库路径，编译器CC的全路径，CXX也配置上，其他就是一些小配置，--prefix是库文件和可执行文件输出的地方；

配置好，执行make，再执行make install，等待完成即可；

步骤四：放到板子上去跑一下curl

笔者把curl产生的文件都拷贝到SD卡里去，然后去执行，

这样curl工具我们就制作好，可以直接使用了。

如果需要编程的来写下载程序的，可以调用curl的接口

int httpsApiDownloadFile(char *strURL, char *strFileName, https_download_progress_cb progress_cb, https_download_writedata_cb writedata_cb)
{
    int ret = -1;
    if(NULL == strURL) {
        return ret;
    }
    log_d("download %s > %s", strURL, strFileName);
    CURL *download_handle;
    CURLcode imgresult;
    FILE *fp = NULL;
    download_handle = curl_easy_init();
    if(download_handle) {
        fp = fopen(strFileName, "w+");
        if( fp == NULL ) {
            log_e(" File cannot be opened ! \n");
            curl_easy_cleanup(download_handle);
            return ret;
        }
        log_d(" File %s be opened ! \n", strFileName);
        curl_easy_setopt(download_handle, CURLOPT_URL, strURL);
        curl_easy_setopt(download_handle, CURLOPT_TIMEOUT, 100);
        curl_easy_setopt(download_handle, CURLOPT_USE_SSL, CURLUSESSL_ALL);
        curl_easy_setopt(download_handle, CURLOPT_SSL_VERIFYHOST, 0);
        curl_easy_setopt(download_handle, CURLOPT_SSL_VERIFYPEER, 0);
//      curl_easy_setopt(download_handle, CURLOPT_POST, 0);
        curl_easy_setopt(download_handle, CURLOPT_WRITEDATA, fp);
        curl_easy_setopt(download_handle, CURLOPT_NOSIGNAL, 1);
        curl_easy_setopt(download_handle, CURLOPT_FOLLOWLOCATION, 1);
        if(writedata_cb != NULL) {
            curl_easy_setopt(download_handle, CURLOPT_WRITEFUNCTION, writedata_cb);
        } else {
            curl_easy_setopt(download_handle, CURLOPT_WRITEFUNCTION, httpsDownloadWriteCb);
        }
        if(progress_cb != NULL) {
            curl_easy_setopt(download_handle, CURLOPT_NOPROGRESS, 0);
            curl_easy_setopt(download_handle, CURLOPT_PROGRESSFUNCTION, progress_cb);//设置进度回调函数
        } else {
            curl_easy_setopt(download_handle, CURLOPT_NOPROGRESS, 1);
        }
        imgresult = curl_easy_perform(download_handle);
        if(CURLE_OK != imgresult) {
            log_w("Cannot grab the File! \n");
            log_w("curl_easy_perform() failed:(%d) %s\n", imgresult, curl_easy_strerror(imgresult));
            ret = -1;
        } else {
            ret = 0;
        }
        fflush(fp);
        fclose(fp);
    }
    curl_easy_cleanup(download_handle);
    return ret;
}

用代码调用curl接口来下载，可以实时获取进度，更好掌控一点。当然根据自己项目需要来完成吧！怎么方便怎么来。