Vincent Sanders's massive update of this example code. One could argue
weather this is still an "example" or a whole new API layer! ;-)
This commit is contained in:
Daniel Stenberg
parent
3660f67534
commit
d3b81ea3f7
@ -1,28 +1,53 @@
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/*****************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* $Id$
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* This example source code introduces a c library buffered I/O interface to
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* URL reads it supports fopen(), fread(), fgets(), feof(), fclose(),
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* rewind(). Supported functions have identical prototypes to their normal c
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* lib namesakes and are preceaded by url_ .
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*
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* This example source code introduces an fopen()/fread()/fclose() emulation
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* for URL reads. Using an approach similar to this, you could replace your
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* program's fopen() with this url_fopen() and fread() with url_fread() and
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* it should be possible to read remote streams instead of (only) local files.
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* Using this code you can replace your program's fopen() with url_fopen()
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* and fread() with url_fread() and it become possible to read remote streams
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* instead of (only) local files. Local files (ie those that can be directly
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* fopened) will drop back to using the underlying clib implementations
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*
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* See the main() function at the bottom that shows a tiny app in action.
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* See the main() function at the bottom that shows an app that retrives from a
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* specified url using fgets() and fread() and saves as two output files.
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*
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* This source code is a proof of concept. It will need further attention to
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* become production-use useful and solid.
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* Coyright (c)2003 Simtec Electronics
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*
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* Re-implemented by Vincent Sanders <vince@kyllikki.org> with extensive
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* reference to original curl example code
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This example requires libcurl 7.9.7 or later.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <curl/curl.h>
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@ -30,206 +55,511 @@
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#error "too old libcurl version, get the latest!"
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#endif
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struct data {
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int type;
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union {
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CURL *curl;
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FILE *file;
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} handle;
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/* This is the documented biggest possible buffer chunk we can get from
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libcurl in one single callback! */
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char buffer[CURL_MAX_WRITE_SIZE];
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enum fcurl_type_e { CFTYPE_NONE=0, CFTYPE_FILE=1, CFTYPE_CURL=2 };
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char *readptr; /* read from here */
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int bytes; /* bytes available from read pointer */
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struct fcurl_data
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{
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enum fcurl_type_e type; /* type of handle */
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union {
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CURL *curl;
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FILE *file;
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} handle; /* handle */
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CURLMcode m; /* stored from a previous url_fread() */
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char *buffer; /* buffer to store cached data*/
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int buffer_len; /* currently allocated buffers length */
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int buffer_pos; /* end of data in buffer*/
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int still_running; /* Is background url fetch still in progress */
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};
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typedef struct data URL_FILE;
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typedef struct fcurl_data URL_FILE;
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/* exported functions */
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URL_FILE *url_fopen(char *url,const char *operation);
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int url_fclose(URL_FILE *file);
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int url_feof(URL_FILE *file);
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size_t url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file);
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char * url_fgets(char *ptr, int size, URL_FILE *file);
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void url_rewind(URL_FILE *file);
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/* we use a global one for convenience */
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CURLM *multi_handle;
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static
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size_t write_callback(char *buffer,
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size_t size,
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size_t nitems,
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void *userp)
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/* curl calls this routine to get more data */
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static size_t
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write_callback(char *buffer,
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size_t size,
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size_t nitems,
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void *userp)
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{
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URL_FILE *url = (URL_FILE *)userp;
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size *= nitems;
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char *newbuff;
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int rembuff;
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memcpy(url->readptr, buffer, size);
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url->readptr += size;
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url->bytes += size;
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URL_FILE *url = (URL_FILE *)userp;
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size *= nitems;
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fprintf(stderr, "callback %d size bytes\n", size);
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rembuff=url->buffer_len - url->buffer_pos;//remaining space in buffer
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return size;
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if(size > rembuff)
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{
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//not enuf space in buffer
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newbuff=realloc(url->buffer,url->buffer_len + (size - rembuff));
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if(newbuff==NULL)
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{
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fprintf(stderr,"callback buffer grow failed\n");
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size=rembuff;
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}
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else
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{
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/* realloc suceeded increase buffer size*/
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url->buffer_len+=size - rembuff;
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url->buffer=newbuff;
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/*printf("Callback buffer grown to %d bytes\n",url->buffer_len);*/
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}
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}
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memcpy(&url->buffer[url->buffer_pos], buffer, size);
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url->buffer_pos += size;
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/*fprintf(stderr, "callback %d size bytes\n", size);*/
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return size;
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}
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URL_FILE *url_fopen(char *url, char *operation)
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/* use to attempt to fill the read buffer up to requested number of bytes */
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static int
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curl_fill_buffer(URL_FILE *file,int want,int waittime)
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{
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/* this code could check for URLs or types in the 'url' and
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basicly use the real fopen() for standard files */
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd;
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struct timeval timeout;
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int rc;
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URL_FILE *file;
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int still_running;
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(void)operation;
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/* only attempt to fill buffer if transactions still running and buffer
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* doesnt exceed required size already
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*/
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if((!file->still_running) || (file->buffer_pos > want))
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return 0;
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file = (URL_FILE *)malloc(sizeof(URL_FILE));
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if(!file)
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return NULL;
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/* attempt to fill buffer */
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do
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{
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FD_ZERO(&fdread);
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FD_ZERO(&fdwrite);
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FD_ZERO(&fdexcep);
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memset(file, 0, sizeof(URL_FILE));
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/* set a suitable timeout to fail on */
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timeout.tv_sec = 60; /* 1 minute */
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timeout.tv_usec = 0;
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file->type = 1; /* marked as URL, use 0 for plain file */
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file->handle.curl = curl_easy_init();
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/* get file descriptors from the transfers */
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curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
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curl_easy_setopt(file->handle.curl, CURLOPT_URL, url);
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curl_easy_setopt(file->handle.curl, CURLOPT_FILE, file);
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curl_easy_setopt(file->handle.curl, CURLOPT_VERBOSE, FALSE);
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curl_easy_setopt(file->handle.curl, CURLOPT_WRITEFUNCTION, write_callback);
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rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
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if(!multi_handle)
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multi_handle = curl_multi_init();
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switch(rc) {
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case -1:
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/* select error */
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break;
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curl_multi_add_handle(multi_handle, file->handle.curl);
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case 0:
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break;
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while(CURLM_CALL_MULTI_PERFORM ==
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curl_multi_perform(multi_handle, &still_running));
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default:
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/* timeout or readable/writable sockets */
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/* note we *could* be more efficient and not wait for
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* CURLM_CALL_MULTI_PERFORM to clear here and check it on re-entry
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* but that gets messy */
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while(curl_multi_perform(multi_handle, &file->still_running) ==
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CURLM_CALL_MULTI_PERFORM);
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/* if still_running would be 0 now, we should return NULL */
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return file;
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break;
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}
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} while(file->still_running && (file->buffer_pos < want));
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return 1;
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}
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void url_fclose(URL_FILE *file)
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/* use to remove want bytes from the front of a files buffer */
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static int
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curl_use_buffer(URL_FILE *file,int want)
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{
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/* make sure the easy handle is not in the multi handle anymore */
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curl_multi_remove_handle(multi_handle, file->handle.curl);
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/* sort out buffer */
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if((file->buffer_pos - want) <=0)
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{
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/* ditch buffer - write will recreate */
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if(file->buffer)
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free(file->buffer);
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/* cleanup */
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curl_easy_cleanup(file->handle.curl);
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file->buffer=NULL;
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file->buffer_pos=0;
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file->buffer_len=0;
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}
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else
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{
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/* move rest down make it available for later */
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memmove(file->buffer,
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&file->buffer[want],
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(file->buffer_pos - want));
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file->buffer_pos -= want;
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}
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return 0;
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}
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size_t url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file)
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URL_FILE *
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url_fopen(char *url,const char *operation)
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{
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd;
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struct timeval timeout;
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int rc;
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int still_running = 0;
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/* this code could check for URLs or types in the 'url' and
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basicly use the real fopen() for standard files */
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if(!file->bytes) { /* no data available at this point */
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URL_FILE *file;
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(void)operation;
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file->readptr = file->buffer; /* reset read pointer */
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file = (URL_FILE *)malloc(sizeof(URL_FILE));
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if(!file)
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return NULL;
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if(CURLM_CALL_MULTI_PERFORM == file->m) {
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while(CURLM_CALL_MULTI_PERFORM ==
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curl_multi_perform(multi_handle, &still_running)) {
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if(file->bytes) {
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printf("(fread) WOAH! THis happened!\n");
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break;
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}
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}
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if(!still_running) {
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printf("DONE RUNNING AROUND!\n");
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return 0;
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}
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memset(file, 0, sizeof(URL_FILE));
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if((file->handle.file=fopen(url,operation)))
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{
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file->type = CFTYPE_FILE; /* marked as URL */
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}
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else
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{
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file->type = CFTYPE_CURL; /* marked as URL */
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file->handle.curl = curl_easy_init();
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curl_easy_setopt(file->handle.curl, CURLOPT_URL, url);
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curl_easy_setopt(file->handle.curl, CURLOPT_FILE, file);
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curl_easy_setopt(file->handle.curl, CURLOPT_VERBOSE, FALSE);
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curl_easy_setopt(file->handle.curl, CURLOPT_WRITEFUNCTION, write_callback);
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if(!multi_handle)
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multi_handle = curl_multi_init();
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curl_multi_add_handle(multi_handle, file->handle.curl);
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/* lets start the fetch */
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while(curl_multi_perform(multi_handle, &file->still_running) ==
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CURLM_CALL_MULTI_PERFORM );
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if((file->buffer_pos == 0) && (!file->still_running))
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{
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/* if still_running is 0 now, we should return NULL */
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/* make sure the easy handle is not in the multi handle anymore */
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curl_multi_remove_handle(multi_handle, file->handle.curl);
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/* cleanup */
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curl_easy_cleanup(file->handle.curl);
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free(file);
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file = NULL;
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}
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}
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return file;
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}
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int
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url_fclose(URL_FILE *file)
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{
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int ret=0;/* default is good return */
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switch(file->type)
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{
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case CFTYPE_FILE:
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ret=fclose(file->handle.file); /* passthrough */
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break;
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case CFTYPE_CURL:
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/* make sure the easy handle is not in the multi handle anymore */
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curl_multi_remove_handle(multi_handle, file->handle.curl);
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/* cleanup */
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curl_easy_cleanup(file->handle.curl);
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break;
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default: /* unknown or supported type - oh dear */
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ret=EOF;
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errno=EBADF;
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break;
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|
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}
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if(file->buffer)
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free(file->buffer);/* free any allocated buffer space */
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free(file);
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return ret;
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}
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int
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url_feof(URL_FILE *file)
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{
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int ret=0;
|
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|
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switch(file->type)
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{
|
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case CFTYPE_FILE:
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ret=feof(file->handle.file);
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break;
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case CFTYPE_CURL:
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if((file->buffer_pos == 0) && (!file->still_running))
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ret = 1;
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break;
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default: /* unknown or supported type - oh dear */
|
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ret=-1;
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errno=EBADF;
|
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break;
|
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}
|
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return ret;
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}
|
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|
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size_t
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url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file)
|
||||
{
|
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size_t want;
|
||||
|
||||
switch(file->type)
|
||||
{
|
||||
case CFTYPE_FILE:
|
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want=fread(ptr,size,nmemb,file->handle.file);
|
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break;
|
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|
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case CFTYPE_CURL:
|
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want = nmemb * size;
|
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|
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curl_fill_buffer(file,want,1);
|
||||
|
||||
/* check if theres data in the buffer - if not curl_fill_buffer()
|
||||
* either errored or EOF */
|
||||
if(!file->buffer_pos)
|
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return 0;
|
||||
|
||||
/* ensure only available data is considered */
|
||||
if(file->buffer_pos < want)
|
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want = file->buffer_pos;
|
||||
|
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/* xfer data to caller */
|
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memcpy(ptr, file->buffer, want);
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|
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curl_use_buffer(file,want);
|
||||
|
||||
want = want / size; /* number of items - nb correct op - checked
|
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* with glibc code*/
|
||||
|
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/*printf("(fread) return %d bytes %d left\n", want,file->buffer_pos);*/
|
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break;
|
||||
|
||||
default: /* unknown or supported type - oh dear */
|
||||
want=0;
|
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errno=EBADF;
|
||||
break;
|
||||
|
||||
}
|
||||
return want;
|
||||
}
|
||||
|
||||
char *
|
||||
url_fgets(char *ptr, int size, URL_FILE *file)
|
||||
{
|
||||
int want = size - 1;/* always need to leave room for zero termination */
|
||||
int loop;
|
||||
|
||||
switch(file->type)
|
||||
{
|
||||
case CFTYPE_FILE:
|
||||
ptr = fgets(ptr,size,file->handle.file);
|
||||
break;
|
||||
|
||||
case CFTYPE_CURL:
|
||||
curl_fill_buffer(file,want,1);
|
||||
|
||||
/* check if theres data in the buffer - if not fill either errored or
|
||||
* EOF */
|
||||
if(!file->buffer_pos)
|
||||
return NULL;
|
||||
|
||||
/* ensure only available data is considered */
|
||||
if(file->buffer_pos < want)
|
||||
want = file->buffer_pos;
|
||||
|
||||
/*buffer contains data */
|
||||
/* look for newline or eof */
|
||||
for(loop=0;loop < want;loop++)
|
||||
{
|
||||
if(file->buffer[loop] == '\n')
|
||||
{
|
||||
want=loop+1;/* include newline */
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* xfer data to caller */
|
||||
memcpy(ptr, file->buffer, want);
|
||||
ptr[want]=0;/* allways null terminate */
|
||||
|
||||
curl_use_buffer(file,want);
|
||||
|
||||
/*printf("(fgets) return %d bytes %d left\n", want,file->buffer_pos);*/
|
||||
break;
|
||||
|
||||
default: /* unknown or supported type - oh dear */
|
||||
ptr=NULL;
|
||||
errno=EBADF;
|
||||
break;
|
||||
}
|
||||
|
||||
return ptr;/*success */
|
||||
}
|
||||
|
||||
void
|
||||
url_rewind(URL_FILE *file)
|
||||
{
|
||||
switch(file->type)
|
||||
{
|
||||
case CFTYPE_FILE:
|
||||
rewind(file->handle.file); /* passthrough */
|
||||
break;
|
||||
|
||||
case CFTYPE_CURL:
|
||||
/* halt transaction */
|
||||
curl_multi_remove_handle(multi_handle, file->handle.curl);
|
||||
|
||||
/* restart */
|
||||
curl_multi_add_handle(multi_handle, file->handle.curl);
|
||||
|
||||
/* ditch buffer - write will recreate - resets stream pos*/
|
||||
if(file->buffer)
|
||||
free(file->buffer);
|
||||
|
||||
file->buffer=NULL;
|
||||
file->buffer_pos=0;
|
||||
file->buffer_len=0;
|
||||
|
||||
break;
|
||||
|
||||
default: /* unknown or supported type - oh dear */
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
/* Small main program to retrive from a url using fgets and fread saving the
|
||||
* output to two test files (note the fgets method will corrupt binary files if
|
||||
* they contain 0 chars */
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
URL_FILE *handle;
|
||||
FILE *outf;
|
||||
|
||||
int nread;
|
||||
char buffer[256];
|
||||
char *url;
|
||||
|
||||
if(argc < 2)
|
||||
{
|
||||
url="http://192.168.7.3/testfile";/* default to testurl */
|
||||
}
|
||||
else
|
||||
{
|
||||
url=argv[1];/* use passed url */
|
||||
}
|
||||
|
||||
/* copy from url line by line with fgets */
|
||||
outf=fopen("fgets.test","w+");
|
||||
if(!outf)
|
||||
{
|
||||
perror("couldnt open fgets output file\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
handle = url_fopen(url, "r");
|
||||
if(!handle)
|
||||
{
|
||||
printf("couldn't url_fopen()\n");
|
||||
fclose(outf);
|
||||
return 2;
|
||||
}
|
||||
|
||||
while(!url_feof(handle))
|
||||
{
|
||||
url_fgets(buffer,sizeof(buffer),handle);
|
||||
fwrite(buffer,1,strlen(buffer),outf);
|
||||
}
|
||||
|
||||
url_fclose(handle);
|
||||
|
||||
fclose(outf);
|
||||
|
||||
|
||||
/* Copy from url with fread */
|
||||
outf=fopen("fread.test","w+");
|
||||
if(!outf)
|
||||
{
|
||||
perror("couldnt open fread output file\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
handle = url_fopen("testfile", "r");
|
||||
if(!handle) {
|
||||
printf("couldn't url_fopen()\n");
|
||||
fclose(outf);
|
||||
return 2;
|
||||
}
|
||||
|
||||
do {
|
||||
nread = url_fread(buffer, 1,sizeof(buffer), handle);
|
||||
fwrite(buffer,1,nread,outf);
|
||||
} while(nread);
|
||||
|
||||
FD_ZERO(&fdread);
|
||||
FD_ZERO(&fdwrite);
|
||||
FD_ZERO(&fdexcep);
|
||||
|
||||
/* set a suitable timeout to fail on */
|
||||
timeout.tv_sec = 500; /* 5 minutes */
|
||||
timeout.tv_usec = 0;
|
||||
url_fclose(handle);
|
||||
|
||||
/* get file descriptors from the transfers */
|
||||
curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
|
||||
fclose(outf);
|
||||
|
||||
rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
|
||||
|
||||
switch(rc) {
|
||||
case -1:
|
||||
/* select error */
|
||||
break;
|
||||
case 0:
|
||||
break;
|
||||
default:
|
||||
/* timeout or readable/writable sockets */
|
||||
printf("select() returned %d!\n", rc);
|
||||
do {
|
||||
file->m = curl_multi_perform(multi_handle, &still_running);
|
||||
|
||||
if(file->bytes)
|
||||
/* we have received data, return that now */
|
||||
break;
|
||||
|
||||
} while(CURLM_CALL_MULTI_PERFORM == file->m);
|
||||
/* Test rewind */
|
||||
outf=fopen("rewind.test","w+");
|
||||
if(!outf)
|
||||
{
|
||||
perror("couldnt open fread output file\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
if(!still_running)
|
||||
printf("DONE RUNNING AROUND!\n");
|
||||
|
||||
break;
|
||||
}
|
||||
} while(still_running && (file->bytes <= 0));
|
||||
}
|
||||
else
|
||||
printf("(fread) Skip network read\n");
|
||||
handle = url_fopen("testfile", "r");
|
||||
if(!handle) {
|
||||
printf("couldn't url_fopen()\n");
|
||||
fclose(outf);
|
||||
return 2;
|
||||
}
|
||||
|
||||
if(file->bytes) {
|
||||
/* data already available, return that */
|
||||
int want = size * nmemb;
|
||||
nread = url_fread(buffer, 1,sizeof(buffer), handle);
|
||||
fwrite(buffer,1,nread,outf);
|
||||
url_rewind(handle);
|
||||
|
||||
if(file->bytes < want)
|
||||
want = file->bytes;
|
||||
buffer[0]='\n';
|
||||
fwrite(buffer,1,1,outf);
|
||||
|
||||
memcpy(ptr, file->readptr, want);
|
||||
file->readptr += want;
|
||||
file->bytes -= want;
|
||||
nread = url_fread(buffer, 1,sizeof(buffer), handle);
|
||||
fwrite(buffer,1,nread,outf);
|
||||
|
||||
printf("(fread) return %d bytes\n", want);
|
||||
|
||||
return want;
|
||||
}
|
||||
return 0; /* no data available to return */
|
||||
}
|
||||
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
URL_FILE *handle;
|
||||
int nread;
|
||||
char buffer[256];
|
||||
|
||||
(void)argc;
|
||||
(void)argv;
|
||||
|
||||
handle = url_fopen("http://curl.haxx.se/", "r");
|
||||
|
||||
if(!handle) {
|
||||
printf("couldn't url_fopen()\n");
|
||||
}
|
||||
|
||||
do {
|
||||
nread = url_fread(buffer, sizeof(buffer), 1, handle);
|
||||
|
||||
printf("We got: %d bytes\n", nread);
|
||||
} while(nread);
|
||||
|
||||
url_fclose(handle);
|
||||
|
||||
return 0;
|
||||
url_fclose(handle);
|
||||
|
||||
fclose(outf);
|
||||
|
||||
|
||||
return 0;/* all done */
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user