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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "setup.h"
#include <curl/curl.h>
#define ENABLE_CURLX_PRINTF
/* use our own printf() functions */
#include "curlx.h"
#include "tool_cfgable.h"
#include "tool_msgs.h"
#include "tool_cb_wrt.h"
#include "memdebug.h" /* keep this as LAST include */
/*
** callback for CURLOPT_WRITEFUNCTION
*/
size_t tool_write_cb(void *buffer, size_t sz, size_t nmemb, void *userdata)
{
size_t rc;
struct OutStruct *out = userdata;
struct Configurable *config = out->config;
/*
* Once that libcurl has called back tool_write_cb() the returned value
* is checked against the amount that was intended to be written, if
* it does not match then it fails with CURLE_WRITE_ERROR. So at this
* point returning a value different from sz*nmemb indicates failure.
*/
const size_t err_rc = (sz * nmemb) ? 0 : 1;
#ifdef DEBUGBUILD
if(sz * nmemb > (size_t)CURL_MAX_WRITE_SIZE) {
warnf(config, "Data size exceeds single call write limit!\n");
return err_rc; /* Failure */
}
#endif
if(!out->stream) {
out->bytes = 0; /* nothing written yet */
if(!out->filename) {
warnf(config, "Remote filename has no length!\n");
return err_rc; /* Failure */
}
if(config->content_disposition) {
/* don't overwrite existing files */
FILE* f = fopen(out->filename, "r");
if(f) {
fclose(f);
warnf(config, "Refusing to overwrite %s: %s\n", out->filename,
strerror(EEXIST));
return err_rc; /* Failure */
}
}
/* open file for writing */
out->stream = fopen(out->filename, "wb");
if(!out->stream) {
warnf(config, "Failed to create the file %s: %s\n", out->filename,
strerror(errno));
return err_rc; /* failure */
}
}
rc = fwrite(buffer, sz, nmemb, out->stream);
if((sz * nmemb) == rc)
/* we added this amount of data to the output */
out->bytes += (sz * nmemb);
if(config->readbusy) {
config->readbusy = FALSE;
curl_easy_pause(config->easy, CURLPAUSE_CONT);
}
if(config->nobuffer) {
/* disable output buffering */
int res = fflush(out->stream);
if(res) {
/* return a value that isn't the same as sz * nmemb */
return err_rc; /* failure */
}
}
return rc;
}
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