1/* 2 * delta.h: private delta library things 3 * 4 * ==================================================================== 5 * Licensed to the Apache Software Foundation (ASF) under one 6 * or more contributor license agreements. See the NOTICE file 7 * distributed with this work for additional information 8 * regarding copyright ownership. The ASF licenses this file 9 * to you under the Apache License, Version 2.0 (the 10 * "License"); you may not use this file except in compliance 11 * with the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, 16 * software distributed under the License is distributed on an 17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 18 * KIND, either express or implied. See the License for the 19 * specific language governing permissions and limitations 20 * under the License. 21 * ==================================================================== 22 */ 23 24/* ==================================================================== */ 25 26 27#include <apr_pools.h> 28#include <apr_hash.h> 29 30#include "svn_delta.h" 31 32#ifndef SVN_LIBSVN_DELTA_H 33#define SVN_LIBSVN_DELTA_H 34 35 36#ifdef __cplusplus 37extern "C" { 38#endif /* __cplusplus */ 39 40 41/* Private interface for text deltas. */ 42 43/* The standard size of one svndiff window. */ 44 45#define SVN_DELTA_WINDOW_SIZE 102400 46 47 48/* Context/baton for building an operation sequence. */ 49 50typedef struct svn_txdelta__ops_baton_t { 51 int num_ops; /* current number of ops */ 52 int src_ops; /* current number of source copy ops */ 53 int ops_size; /* number of ops allocated */ 54 svn_txdelta_op_t *ops; /* the operations */ 55 56 svn_stringbuf_t *new_data; /* any new data used by the operations */ 57} svn_txdelta__ops_baton_t; 58 59 60/* Insert a delta op into the delta window being built via BUILD_BATON. If 61 OPCODE is svn_delta_new, bytes from NEW_DATA are copied into the window 62 data and OFFSET is ignored. Otherwise NEW_DATA is ignored. All 63 allocations are performed in POOL. */ 64void svn_txdelta__insert_op(svn_txdelta__ops_baton_t *build_baton, 65 enum svn_delta_action opcode, 66 apr_size_t offset, 67 apr_size_t length, 68 const char *new_data, 69 apr_pool_t *pool); 70 71/* Remove / truncate the last delta ops spanning the last MAX_LEN bytes 72 from the delta window being built via BUILD_BATON starting. Return the 73 number of bytes that were actually removed. */ 74apr_size_t 75svn_txdelta__remove_copy(svn_txdelta__ops_baton_t *build_baton, 76 apr_size_t max_len); 77 78/* Allocate a delta window from POOL. */ 79svn_txdelta_window_t * 80svn_txdelta__make_window(const svn_txdelta__ops_baton_t *build_baton, 81 apr_pool_t *pool); 82 83 84/* Create xdelta window data. Allocate temporary data from POOL. */ 85void svn_txdelta__xdelta(svn_txdelta__ops_baton_t *build_baton, 86 const char *start, 87 apr_size_t source_len, 88 apr_size_t target_len, 89 apr_pool_t *pool); 90 91 92#ifdef __cplusplus 93} 94#endif /* __cplusplus */ 95 96#endif /* SVN_LIBSVN_DELTA_H */ 97