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ccnxFileRepo_ManifestFetcher.h
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ccnxFileRepo_ManifestFetcher.h
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/*
* Copyright (c) 2016, Xerox Corporation (Xerox) and Palo Alto Research Center, Inc (PARC)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 XEROX OR PARC 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.
*
* ################################################################################
* #
* # PATENT NOTICE
* #
* # This software is distributed under the BSD 2-clause License (see LICENSE
* # file). This BSD License does not make any patent claims and as such, does
* # not act as a patent grant. The purpose of this section is for each contributor
* # to define their intentions with respect to intellectual property.
* #
* # Each contributor to this source code is encouraged to state their patent
* # claims and licensing mechanisms for any contributions made. At the end of
* # this section contributors may each make their own statements. Contributor's
* # claims and grants only apply to the pieces (source code, programs, text,
* # media, etc) that they have contributed directly to this software.
* #
* # There is no guarantee that this section is complete, up to date or accurate. It
* # is up to the contributors to maintain their portion of this section and up to
* # the user of the software to verify any claims herein.
* #
* # Do not remove this header notification. The contents of this section must be
* # present in all distributions of the software. You may only modify your own
* # intellectual property statements. Please provide contact information.
*
* - Palo Alto Research Center, Inc
* This software distribution does not grant any rights to patents owned by Palo
* Alto Research Center, Inc (PARC). Rights to these patents are available via
* various mechanisms. As of January 2016 PARC has committed to FRAND licensing any
* intellectual property used by its contributions to this software. You may
* contact PARC at cipo@parc.com for more information or visit http://www.ccnx.org
*/
/**
* @author Christopher A. Wood, Palo Alto Research Center (Xerox PARC)
* @copyright (c) 2016, Xerox Corporation (Xerox) and Palo Alto Research Center, Inc (PARC). All rights reserved.
*/
#ifndef ccnxFileRepoManifestFetcher_h
#define ccnxFileRepoManifestFetcher_h
#include <ccnx/common/ccnx_Name.h>
#include <ccnx/api/ccnx_Portal/ccnx_Portal.h>
struct ccnx_manifest_fetcher;
typedef struct ccnx_manifest_fetcher CCNxFileRepoManifestFetcher;
/**
* Create a new `CCNxManifestFetcher` that uses the given portal to recover
* application data from the given Manifest.
*
* @param [in] port The `CCNxPortal` through which to resolve a Manifest.
* @param [in] root The root of a `CCNxManifest` to resolve.
*
* @return A new `CCNxFileRepoManifestFetcher` instance.
*
* Example:
* @code
* {
* CCNxPortal *portal = ...
* CCNxManifest *manifest = ...
* CCNxFileRepoManifestFetcher *cache = ccnxFileRepoManifestFetcher_Create(portal, manifest);
* }
* @endcode
*/
CCNxFileRepoManifestFetcher *ccnxFileRepoManifestFetcher_Create(CCNxPortal *portal, CCNxManifest *root);
/**
* Increase the number of references to a `CCNxFileRepoManifestFetcher` instance.
*
* Note that new `CCNxFileRepoManifestFetcher` is not created,
* only that the given `CCNxFileRepoManifestFetcher` reference count is incremented.
* Discard the reference by invoking `ccnxFileRepoManifestFetcher_Release`.
*
* @param [in] instance A pointer to a valid CCNxFileRepoManifestFetcher instance.
*
* @return The same value as @p instance.
*
* Example:
* @code
* {
* CCNxFileRepoManifestFetcher *a = ccnxFileRepoManifestFetcher_Create();
*
* CCNxFileRepoManifestFetcher *b = ccnxFileRepoManifestFetcher_Acquire(a);
*
* ccnxFileRepoManifestFetcher_Release(&a);
* ccnxFileRepoManifestFetcher_Release(&b);
* }
* @endcode
*/
CCNxFileRepoManifestFetcher *ccnxFileRepoManifestFetcher_Acquire(const CCNxFileRepoManifestFetcher *instance);
/**
* Release a previously acquired reference to the given `CCNxFileRepoManifestFetcher` instance,
* decrementing the reference count for the instance.
*
* The pointer to the instance is set to NULL as a side-effect of this function.
*
* If the invocation causes the last reference to the instance to be released,
* the instance is deallocated and the instance's implementation will perform
* additional cleanup and release other privately held references.
*
* @param [in,out] instancePtr A pointer to a pointer to the instance to release.
*
* Example:
* @code
* {
* CCNxFileRepoManifestFetcher *a = ccnxFileRepoManifestFetcher_Create(...);
*
* ccnxFileRepoManifestFetcher_Release(&a);
* }
* @endcode
*/
void ccnxFileRepoManifestFetcher_Release(CCNxFileRepoManifestFetcher **instancePtr);
/**
* Fill the provided `PARCBuffer` with application data. Return false if more data
* exists in the Manifest.
*
* @param [in] fetcher A `CCNxManifestFetcher` instance.
* @param [in, out] buffer A `PARCBuffer` to fill with application data bytes.
*
* Example:
* @code
* {
* CCNxFileRepoManifestFetcher *fetcher = ...
* PARCBuffer *buffer = parcBuffer_Allocate(8192);
*
* bool done = ccnxFileRepoManifestFetcher_FillBuffer(fetcher, buffer);
* while (!done) {
* // use the data and then fill more into the buffer
* }
* }
* @endcode
*/
bool ccnxFileRepoManifestFetcher_FillBuffer(CCNxFileRepoManifestFetcher *fetcher, PARCBuffer *buffer);
#endif // ccnxFileRepoManifestFetcher_h