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/* changes.h --- FSX changed paths lists container
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*/
#ifndef SVN_LIBSVN_FS__CHANGES_H
#define SVN_LIBSVN_FS__CHANGES_H
#include "svn_io.h"
#include "fs.h"
/* Entries in a revision's change list tend to be widely redundant (similar
* changes to similar paths). Even more so, change lists from a larger
* revision range also tend to overlap.
*
* In its serialized form, the svn_fs_x__changes_t container extracts most
* of that redundancy and the run-time representation is also much smaller
* than sum of the respective svn_fs_x__change_t* arrays.
*
* As with other containers, this one has two modes: 'construction', in
* which you may add data to it, and 'getter' in which there is only r/o
* access to the data.
*/
/* An opaque collection of change lists (apr_array_header_t * of
* svn_fs_x__change_t *).
*/
typedef struct svn_fs_x__changes_t svn_fs_x__changes_t;
/* Create and populate changes containers. */
/* Create and return a new changes container with an initial capacity of
* INITIAL_COUNT svn_fs_x__change_t objects.
* Allocate the result in RESULT_POOL.
*/
svn_fs_x__changes_t *
svn_fs_x__changes_create(apr_size_t initial_count,
apr_pool_t *result_pool);
/* Start a new change list CHANGES (implicitly terminating the previous one)
* and return its index in *LIST_INDEX. Append all changes from LIST to
* that new change list.
*/
svn_error_t *
svn_fs_x__changes_append_list(apr_size_t *list_index,
svn_fs_x__changes_t *changes,
apr_array_header_t *list);
/* Return a rough estimate in bytes for the serialized representation
* of CHANGES.
*/
apr_size_t
svn_fs_x__changes_estimate_size(const svn_fs_x__changes_t *changes);
/* Read changes containers. */
/* From CHANGES, extract the change list with the given IDX. Allocate
* the result in POOL and return it in *LIST.
*/
svn_error_t *
svn_fs_x__changes_get_list(apr_array_header_t **list,
const svn_fs_x__changes_t *changes,
apr_size_t idx,
apr_pool_t *pool);
/* I/O interface. */
/* Write a serialized representation of CHANGES to STREAM.
* Use SCRATCH_POOL for temporary allocations.
*/
svn_error_t *
svn_fs_x__write_changes_container(svn_stream_t *stream,
const svn_fs_x__changes_t *changes,
apr_pool_t *scratch_pool);
/* Read a changes container from its serialized representation in STREAM.
* Allocate the result in RESULT_POOL and return it in *CHANGES_P. Use
* SCRATCH_POOL for temporary allocations.
*/
svn_error_t *
svn_fs_x__read_changes_container(svn_fs_x__changes_t **changes_p,
svn_stream_t *stream,
apr_pool_t *result_pool,
apr_pool_t *scratch_pool);
/* Implements #svn_cache__serialize_func_t for svn_fs_x__changes_t objects.
*/
svn_error_t *
svn_fs_x__serialize_changes_container(void **data,
apr_size_t *data_len,
void *in,
apr_pool_t *pool);
/* Implements #svn_cache__deserialize_func_t for svn_fs_x__changes_t objects.
*/
svn_error_t *
svn_fs_x__deserialize_changes_container(void **out,
void *data,
apr_size_t data_len,
apr_pool_t *pool);
/* Implements svn_cache__partial_getter_func_t for svn_fs_x__changes_t,
* setting *OUT to the change list (apr_array_header_t *) selected by
* the apr_uint32_t index passed in as *BATON. This function is similar
* to svn_fs_x__changes_get_list but operates on the cache serialized
* representation of the container.
*/
svn_error_t *
svn_fs_x__changes_get_list_func(void **out,
const void *data,
apr_size_t data_len,
void *baton,
apr_pool_t *pool);
#endif
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