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/*
* Copyright (C) 2008-2011 Martin Willi
* Hochschule fuer Technik Rapperswil
* Copyright (C) 2011 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup fetcheri fetcher
* @{ @ingroup fetcher
*/
#ifndef FETCHER_H_
#define FETCHER_H_
typedef struct fetcher_t fetcher_t;
typedef enum fetcher_option_t fetcher_option_t;
#include <stdarg.h>
#include <chunk.h>
/**
* Constructor function which creates fetcher instances.
*
* @return fetcher instance
*/
typedef fetcher_t* (*fetcher_constructor_t)();
/**
* Callback function used with FETCH_CALLBACK.
*
* @param userdata userdata passed to fetcher_t.fetch()
* @param chunk chunk with next chunk of data
* @return TRUE to continue with transfer, FALSE to abort
*/
typedef bool (*fetcher_callback_t)(void *userdata, chunk_t chunk);
#include <library.h>
/**
* Fetching options to use for fetcher_t.fetch() call.
*/
enum fetcher_option_t {
/**
* Data to include in fetch request, e.g. on a HTTP post.
* Additional argument is a chunk_t
*/
FETCH_REQUEST_DATA,
/**
* Mime-Type of data included in FETCH_REQUEST_DATA.
* Additional argument is a char*.
*/
FETCH_REQUEST_TYPE,
/**
* HTTP header to be sent with with the fetch request.
* Additional argument is a char*.
*/
FETCH_REQUEST_HEADER,
/**
* Use HTTP Version 1.0 instead of 1.1.
* No additional argument is needed.
*/
FETCH_HTTP_VERSION_1_0,
/**
* Timeout to use for fetch, in seconds.
* Additional argument is u_int
*/
FETCH_TIMEOUT,
/**
* Callback to invoke with each chunk of data.
* Additional argument fetch_callback_t.
* If this option is not given, the fetcher_default_callback is used,
* which accumulates the data into an allocated chunk.
*/
FETCH_CALLBACK,
/**
* end of fetching options
*/
FETCH_END,
};
/**
* Fetcher interface, an implementation fetches data from an URL.
*/
struct fetcher_t {
/**
* Fetch data from URI into chunk.
*
* The fetcher returns NOT_SUPPORTED to indicate that it is uncappable
* to handle such URLs. Other return values indicate a failure, and
* fetching of that URL gets cancelled.
* If no FETCH_CALLBACK function is set as option, userdata must be
* a chunk_t*. This chunk gets allocated, accumulated data using the
* fetcher_default_callback() function.
*
* @param uri URI to fetch from
* @param userdata userdata to pass to callback function.
* @return
* - SUCCESS if fetch was successful
* - NOT_SUPPORTED if fetcher does not support such URLs
* - FAILED, NOT_FOUND, PARSE_ERROR on failure
*/
status_t (*fetch)(fetcher_t *this, char *uri, void *userdata);
/**
* Set a fetcher option, as defined in fetcher_option_t.
*
* Arguments passed to options must stay in memory until fetch() returns.
*
* @param option option to set
* @param ... variable argument(s) to option
* @return TRUE if option supported, FALSE otherwise
*/
bool (*set_option)(fetcher_t *this, fetcher_option_t option, ...);
/**
* Destroy the fetcher instance.
*/
void (*destroy)(fetcher_t *this);
};
/**
* Default fetcher callback function, accumulates data to a chunk.
*
* @param userdata chunk for allocated data, empty on first invocation
* @param chunk current chunk of data
* @return FALSE if chunk too large to allocate
*/
bool fetcher_default_callback(void *userdata, chunk_t chunk);
#endif /** FETCHER_H_ @}*/
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