Tactical commit whilst converting to URL_FILE
This commit is contained in:
parent
f8c20ab3b1
commit
a355a28ffa
23 changed files with 700 additions and 88 deletions
543
src/io/fopen.c
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543
src/io/fopen.c
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/*
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* fopen.c
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*
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* adapted from https://curl.haxx.se/libcurl/c/fopen.html.
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*
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* Copyright (c) 2003, 2017 Simtec Electronics
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* Some portions (c) 2017 Simon Brooke <simon@journeyman.cc>
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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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#ifndef WIN32
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# include <sys/time.h>
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#endif
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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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/*
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* wide characters
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*/
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#include <wchar.h>
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#include <wctype.h>
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#include "fopen.h"
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/* we use a global one for convenience */
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static CURLM *multi_handle;
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/* curl calls this routine to get more data */
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static 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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{
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char *newbuff;
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size_t rembuff;
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URL_FILE *url = (URL_FILE *)userp;
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size *= nitems;
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rembuff = url->buffer_len - url->buffer_pos; /* remaining space in buffer */
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if(size > rembuff) {
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/* not enough 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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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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/* realloc succeeded increase buffer size*/
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url->buffer_len += size - rembuff;
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url->buffer = newbuff;
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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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return size;
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}
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/* use to attempt to fill the read buffer up to requested number of bytes */
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static int fill_buffer(URL_FILE *file, size_t want)
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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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struct timeval timeout;
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int rc;
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CURLMcode mc; /* curl_multi_fdset() return code */
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/* only attempt to fill buffer if transactions still running and buffer
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* doesn't 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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/* attempt to fill buffer */
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do {
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int maxfd = -1;
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long curl_timeo = -1;
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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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/* 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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curl_multi_timeout(multi_handle, &curl_timeo);
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if(curl_timeo >= 0) {
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timeout.tv_sec = curl_timeo / 1000;
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if(timeout.tv_sec > 1)
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timeout.tv_sec = 1;
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else
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timeout.tv_usec = (curl_timeo % 1000) * 1000;
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}
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/* get file descriptors from the transfers */
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mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
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break;
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}
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/* On success the value of maxfd is guaranteed to be >= -1. We call
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select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
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no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
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to sleep 100ms, which is the minimum suggested value in the
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curl_multi_fdset() doc. */
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if(maxfd == -1) {
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#ifdef _WIN32
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Sleep(100);
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rc = 0;
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#else
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/* Portable sleep for platforms other than Windows. */
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struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
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rc = select(0, NULL, NULL, NULL, &wait);
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#endif
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}
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else {
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/* Note that on some platforms 'timeout' may be modified by select().
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If you need access to the original value save a copy beforehand. */
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rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
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}
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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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case 0:
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default:
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/* timeout or readable/writable sockets */
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curl_multi_perform(multi_handle, &file->still_running);
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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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/* use to remove want bytes from the front of a files buffer */
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static int use_buffer(URL_FILE *file, size_t want)
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{
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/* sort out buffer */
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if((file->buffer_pos - want) <= 0) {
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/* ditch buffer - write will recreate */
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free(file->buffer);
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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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/* 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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URL_FILE *url_fopen(const char *url, const char *operation)
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{
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/* this code could check for URLs or types in the 'url' and
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basically use the real fopen() for standard files */
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URL_FILE *file;
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(void)operation;
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file = calloc(1, sizeof(URL_FILE));
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if(!file)
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return NULL;
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file->handle.file = fopen(url, operation);
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if(file->handle.file)
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file->type = CFTYPE_FILE; /* marked as URL */
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else {
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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_WRITEDATA, file);
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curl_easy_setopt(file->handle.curl, CURLOPT_VERBOSE, 0L);
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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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curl_multi_perform(multi_handle, &file->still_running);
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if((file->buffer_pos == 0) && (!file->still_running)) {
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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 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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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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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 url_feof(URL_FILE *file)
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{
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int ret = 0;
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switch(file->type) {
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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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size_t url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file)
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{
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size_t want;
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switch(file->type) {
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case CFTYPE_FILE:
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want = fread(ptr, size, nmemb, file->handle.file);
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break;
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case CFTYPE_CURL:
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want = nmemb * size;
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fill_buffer(file, want);
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/* check if there's data in the buffer - if not fill_buffer()
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* either errored or EOF */
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if(!file->buffer_pos)
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return 0;
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/* ensure only available data is considered */
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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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use_buffer(file, want);
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want = want / size; /* number of items */
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break;
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default: /* unknown or supported type - oh dear */
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want = 0;
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errno = EBADF;
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break;
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}
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return want;
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}
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char *url_fgets(char *ptr, size_t size, URL_FILE *file)
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{
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size_t want = size - 1;/* always need to leave room for zero termination */
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size_t loop;
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switch(file->type) {
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case CFTYPE_FILE:
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ptr = fgets(ptr, (int)size, file->handle.file);
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break;
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case CFTYPE_CURL:
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fill_buffer(file, want);
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/* check if there's data in the buffer - if not fill either errored or
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* EOF */
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if(!file->buffer_pos)
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return NULL;
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/* ensure only available data is considered */
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if(file->buffer_pos < want)
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want = file->buffer_pos;
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/*buffer contains data */
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/* look for newline or eof */
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for(loop = 0; loop < want; loop++) {
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if(file->buffer[loop] == '\n') {
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want = loop + 1;/* include newline */
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break;
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}
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}
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/* xfer data to caller */
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memcpy(ptr, file->buffer, want);
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ptr[want] = 0;/* always null terminate */
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use_buffer(file, want);
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break;
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default: /* unknown or supported type - oh dear */
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ptr = NULL;
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errno = EBADF;
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break;
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}
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return ptr;/*success */
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}
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void url_rewind(URL_FILE *file)
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{
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switch(file->type) {
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case CFTYPE_FILE:
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rewind(file->handle.file); /* passthrough */
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break;
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case CFTYPE_CURL:
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/* halt transaction */
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curl_multi_remove_handle(multi_handle, file->handle.curl);
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/* restart */
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curl_multi_add_handle(multi_handle, file->handle.curl);
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/* ditch buffer - write will recreate - resets stream pos*/
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free(file->buffer);
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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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break;
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default: /* unknown or supported type - oh dear */
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break;
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}
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}
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/**
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* given this file handle f, return a new url_file handle wrapping it.
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*
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* @param f the file to be wrapped;
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* @return the new handle, or null if no such handle could be allocated.
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*/
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URL_FILE * file_to_url_file( FILE* f) {
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URL_FILE * result = (URL_FILE *)malloc(sizeof(URL_FILE));
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if ( result != NULL) {
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result->type = CFTYPE_FILE,
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result->handle.file = f;
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}
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return result;
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}
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wint_t url_fgetwc(URL_FILE *file) {
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wint_t result = 0;
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switch(file->type) {
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case CFTYPE_FILE:
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fwide( file->handle.file, 1 ); /* wide characters */
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result = fgetc(file->handle.file); /* passthrough */
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break;
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case CFTYPE_CURL:
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url_fread(&result, sizeof(wint_t), 1, file);
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break;
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}
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return result;
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}
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/* #define FGETSFILE "fgets.test" */
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/* #define FREADFILE "fread.test" */
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/* #define REWINDFILE "rewind.test" */
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/* /\* Small main program to retrieve from a url using fgets and fread saving the */
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/* * output to two test files (note the fgets method will corrupt binary files if */
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/* * they contain 0 chars *\/ */
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/* int main(int argc, char *argv[]) */
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/* { */
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/* URL_FILE *handle; */
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/* FILE *outf; */
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/* size_t nread; */
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/* char buffer[256]; */
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/* const char *url; */
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/* if(argc < 2) */
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/* url = "http://192.168.7.3/testfile";/\* default to testurl *\/ */
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/* else */
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/* url = argv[1];/\* use passed url *\/ */
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/* /\* copy from url line by line with fgets *\/ */
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/* outf = fopen(FGETSFILE, "wb+"); */
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/* if(!outf) { */
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/* perror("couldn't open fgets output file\n"); */
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/* return 1; */
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/* } */
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/* handle = url_fopen(url, "r"); */
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/* if(!handle) { */
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/* printf("couldn't url_fopen() %s\n", url); */
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/* fclose(outf); */
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/* return 2; */
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/* } */
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/* while(!url_feof(handle)) { */
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/* url_fgets(buffer, sizeof(buffer), handle); */
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/* fwrite(buffer, 1, strlen(buffer), outf); */
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/* } */
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/* url_fclose(handle); */
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/* fclose(outf); */
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/* /\* Copy from url with fread *\/ */
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/* outf = fopen(FREADFILE, "wb+"); */
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/* if(!outf) { */
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/* perror("couldn't open fread output file\n"); */
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/* return 1; */
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/* } */
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/* handle = url_fopen("testfile", "r"); */
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/* if(!handle) { */
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/* printf("couldn't url_fopen() testfile\n"); */
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/* fclose(outf); */
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/* return 2; */
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/* } */
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/* do { */
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/* nread = url_fread(buffer, 1, sizeof(buffer), handle); */
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/* fwrite(buffer, 1, nread, outf); */
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/* } while(nread); */
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/* url_fclose(handle); */
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/* fclose(outf); */
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/* /\* Test rewind *\/ */
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/* outf = fopen(REWINDFILE, "wb+"); */
|
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/* if(!outf) { */
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/* perror("couldn't open fread output file\n"); */
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/* return 1; */
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/* } */
|
||||
|
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/* handle = url_fopen("testfile", "r"); */
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||||
/* if(!handle) { */
|
||||
/* printf("couldn't url_fopen() testfile\n"); */
|
||||
/* fclose(outf); */
|
||||
/* return 2; */
|
||||
/* } */
|
||||
|
||||
/* nread = url_fread(buffer, 1, sizeof(buffer), handle); */
|
||||
/* fwrite(buffer, 1, nread, outf); */
|
||||
/* url_rewind(handle); */
|
||||
|
||||
/* buffer[0]='\n'; */
|
||||
/* fwrite(buffer, 1, 1, outf); */
|
||||
|
||||
/* nread = url_fread(buffer, 1, sizeof(buffer), handle); */
|
||||
/* fwrite(buffer, 1, nread, outf); */
|
||||
|
||||
/* url_fclose(handle); */
|
||||
|
||||
/* fclose(outf); */
|
||||
|
||||
/* return 0;/\* all done *\/ */
|
||||
/* } */
|
||||
72
src/io/fopen.h
Normal file
72
src/io/fopen.h
Normal file
|
|
@ -0,0 +1,72 @@
|
|||
/*
|
||||
* fopen.h
|
||||
*
|
||||
* adapted from https://curl.haxx.se/libcurl/c/fopen.html.
|
||||
*
|
||||
* Copyright (c) 2003, 2017 Simtec Electronics
|
||||
* Some portions (c) 2017 Simon Brooke <simon@journeyman.cc>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. The name of the author may not be used to endorse or promote products
|
||||
* derived from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||||
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||||
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
* This example requires libcurl 7.9.7 or later.
|
||||
*/
|
||||
|
||||
#ifndef __fopen_h
|
||||
#define __fopen_h
|
||||
|
||||
enum fcurl_type_e {
|
||||
CFTYPE_NONE = 0,
|
||||
CFTYPE_FILE = 1,
|
||||
CFTYPE_CURL = 2
|
||||
};
|
||||
|
||||
struct fcurl_data
|
||||
{
|
||||
enum fcurl_type_e type; /* type of handle */
|
||||
union {
|
||||
CURL *curl;
|
||||
FILE *file;
|
||||
} handle; /* handle */
|
||||
|
||||
char *buffer; /* buffer to store cached data*/
|
||||
size_t buffer_len; /* currently allocated buffers length */
|
||||
size_t buffer_pos; /* end of data in buffer*/
|
||||
int still_running; /* Is background url fetch still in progress */
|
||||
};
|
||||
|
||||
typedef struct fcurl_data URL_FILE;
|
||||
|
||||
/* exported functions */
|
||||
URL_FILE *url_fopen(const char *url, const char *operation);
|
||||
int url_fclose(URL_FILE *file);
|
||||
int url_feof(URL_FILE *file);
|
||||
size_t url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file);
|
||||
char *url_fgets(char *ptr, size_t size, URL_FILE *file);
|
||||
void url_rewind(URL_FILE *file);
|
||||
|
||||
wint_t url_fgetwc(URL_FILE *file);
|
||||
URL_FILE * file_to_url_file( FILE* f);
|
||||
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Add table
Add a link
Reference in a new issue