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130 lines
4.2 KiB
130 lines
4.2 KiB
/*
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* Copyright 2014 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* Low-level source data cache backing store interface.
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*/
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#ifndef NETSURF_CONTENT_LLCACHE_PRIVATE_H_
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#define NETSURF_CONTENT_LLCACHE_PRIVATE_H_
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#include "content/llcache.h"
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/** storage control flags */
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enum backing_store_flags {
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/** no special processing */
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BACKING_STORE_NONE = 0,
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/** data is metadata */
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BACKING_STORE_META = 1,
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};
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/**
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* low level cache backing store operation table
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*
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* The low level cache (source objects) has the capability to make
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* objects and their metadata (headers etc) persistent by writing to a
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* backing store using these operations.
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*/
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struct gui_llcache_table {
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/**
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* Initialise the backing store.
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*
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* @param parameters to configure backing store.
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*initialise)(const struct llcache_store_parameters *parameters);
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/**
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* Finalise the backing store.
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*
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*finalise)(void);
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/**
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* Place an object in the backing store.
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*
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* The object is placed in the persistent store and may be
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* retrieved with the fetch method.
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*
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* The backing store will take a reference to the
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* passed data, subsequently the caller should explicitly
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* release the allocation using the release method and not
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* free the data itself.
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*
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* The caller may not assume that the persistent storage has
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* been completely written on return.
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*
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* @param[in] url The url is used as the unique primary key for the data.
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* @param[in] flags The flags to control how the object is stored.
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* @param[in] data The objects data.
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* @param[in] datalen The length of the \a data.
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*store)(struct nsurl *url, enum backing_store_flags flags,
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uint8_t *data, const size_t datalen);
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/**
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* Retrieve an object from the backing store.
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*
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* The backing store will manage its own memory and the
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* allocations returned in \a data *must* not be altered.
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*
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* The caller must assume nothing about the backing store
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* allocated buffers and the storage and *must* be freed by
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* calling the release method.
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*
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* @param[in] url The url is used as the unique primary key for the data.
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* @param[in] flags The flags to control how the object is retrieved.
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* @param[out] data The retrieved objects data.
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* @param[out] datalen The length of the \a data retrieved.
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*fetch)(struct nsurl *url, enum backing_store_flags flags,
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uint8_t **data, size_t *datalen);
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/**
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* release a previously fetched or stored memory object.
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*
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* @param url The url is used as the unique primary key to invalidate.
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* @param[in] flags The flags to control how the object data is released.
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*release)(struct nsurl *url, enum backing_store_flags flags);
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/**
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* Invalidate a source object from the backing store.
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*
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* The entry (if present in the backing store) must no longer
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* be returned as a result to the fetch or meta operations.
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*
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* If the entry had data allocated it will be released.
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*
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* @param url The url is used as the unique primary key to invalidate.
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* @return NSERROR_OK on success or error code on failure.
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*/
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nserror (*invalidate)(struct nsurl *url);
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};
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extern struct gui_llcache_table* null_llcache_table;
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extern struct gui_llcache_table* filesystem_llcache_table;
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#endif
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