www.ghoon.net :: curl URL redirection example

/*
 * curl_redirection example
 *
 * @date 2008.11.10
 * @author Kang, Ji-Hoon (kang@ghoon.net)
 */
#include <stdio.h>
#include <memory.h>
#include <curl/curl.h>

typedef struct FtpFile {
    char filename[FILENAME_MAX];
    FILE* stream;
} FtpFile;

static size_t
header_callback(void* ptr, size_t size, size_t nmemb, void* stream)
{
    char* buff = (char*) ptr;
    const char* content_disposition = "Content-Disposition: attachment;"
        "filename=";

if (strstr(buff, content_disposition)) {
        FtpFile* pFileInfo = (FtpFile*) stream;
        memset(pFileInfo->filename, 0, sizeof(pFileInfo->filename));
        memcpy(pFileInfo->filename, buff+strlen(content_disposition),
                strlen(buff) - strlen(content_disposition) - 2);

printf("catched filename : %s length : %d\n", pFileInfo->filename,
                strlen(pFileInfo->filename));
    }
    return size * nmemb;
}

static size_t
write_callback(void* buffer, size_t size, size_t nmemb, void* stream)
{
    FtpFile* out = (FtpFile*) stream;
    if ((out && !out->stream) && out->filename) {
        out->stream = fopen(out->filename, "wb");
        if (!out->stream) {
            return -1;
        }
    }
    return fwrite(buffer, size, nmemb, out->stream);
}

/**
 * @param [in] hCurl - curl handle
 * @param [in] sURL -
 * @param [in] sLocalDir -
 * @return 'CURLE_OK' ok, otherwise failure.
 */
static CURLcode
download(CURL* hCurl, const char* sURL, const char* sLocalDir)
{
    FtpFile localfile;
    memset(&localfile, 0, sizeof(FtpFile));

curl_easy_setopt(hCurl, CURLOPT_HEADERFUNCTION, header_callback);
    curl_easy_setopt(hCurl, CURLOPT_HEADERDATA, &localfile);
    curl_easy_setopt(hCurl, CURLOPT_URL, sURL);
    curl_easy_setopt(hCurl, CURLOPT_WRITEFUNCTION, write_callback);
    curl_easy_setopt(hCurl, CURLOPT_WRITEDATA, &localfile);
    curl_easy_setopt(hCurl, CURLOPT_VERBOSE, 1);

CURLcode res =  curl_easy_perform(hCurl);

if (localfile.stream) {
        fclose(localfile.stream);
    }

return res;
}

int main(int argc, char** argv)
{
    const char* sURL = "http://fmov.pann.com/mmediaDownload.jsp?"
        "FileID=12992569";
    const char* sLocalDir = "/home/david/Download";
    CURL* hCurl = NULL;

curl_global_init(CURL_GLOBAL_ALL);
    hCurl = curl_easy_init();

download(hCurl, sURL, sLocalDir);

curl_easy_cleanup(hCurl);
    curl_global_cleanup();

return 0;
}

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curl URL redirection example

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