subversion/libsvn_delta/delta.h

   1 /*
   2  * delta.h:  private delta library things
   3  *
   4  * ====================================================================
   5  * Copyright (c) 2000-2004 CollabNet.  All rights reserved.
   6  *
   7  * This software is licensed as described in the file COPYING, which
   8  * you should have received as part of this distribution.  The terms
   9  * are also available at http://subversion.tigris.org/license-1.html.
  10  * If newer versions of this license are posted there, you may use a
  11  * newer version instead, at your option.
  12  *
  13  * This software consists of voluntary contributions made by many
  14  * individuals.  For exact contribution history, see the revision
  15  * history and logs, available at http://subversion.tigris.org/.
  16  * ====================================================================
  17  */
  18
  19 /* ==================================================================== */
  20
  21
  22 #include <apr_pools.h>
  23 #include <apr_hash.h>
  24
  25 #include "svn_delta.h"
  26
  27 #ifndef SVN_LIBSVN_DELTA_H
  28 #define SVN_LIBSVN_DELTA_H
  29
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif /* __cplusplus */
  34
  35 \f
  36 /* Private interface for text deltas. */
  37
  38 /* The standard size of one svndiff window. */
  39
  40 #define SVN_DELTA_WINDOW_SIZE 102400
  41
  42
  43 /* Context/baton for building an operation sequence. */
  44
  45 typedef struct svn_txdelta__ops_baton_t {
  46   int num_ops;                  /* current number of ops */
  47   int src_ops;                  /* current number of source copy ops */
  48   int ops_size;                 /* number of ops allocated */
  49   svn_txdelta_op_t *ops;        /* the operations */
  50
  51   svn_stringbuf_t *new_data;    /* any new data used by the operations */
  52 } svn_txdelta__ops_baton_t;
  53
  54
  55 /* Insert a delta op into the delta window being built via BUILD_BATON. If
  56    OPCODE is svn_delta_new, bytes from NEW_DATA are copied into the window
  57    data and OFFSET is ignored.  Otherwise NEW_DATA is ignored. All
  58    allocations are performed in POOL. */
  59 void svn_txdelta__insert_op(svn_txdelta__ops_baton_t *build_baton,
  60                             enum svn_delta_action opcode,
  61                             apr_size_t offset,
  62                             apr_size_t length,
  63                             const char *new_data,
  64                             apr_pool_t *pool);
  65
  66
  67 /* Allocate a delta window from POOL. */
  68 svn_txdelta_window_t *
  69 svn_txdelta__make_window(const svn_txdelta__ops_baton_t *build_baton,
  70                          apr_pool_t *pool);
  71
  72 /* Create vdelta window data. Allocate temporary data from POOL. */
  73 void svn_txdelta__vdelta(svn_txdelta__ops_baton_t *build_baton,
  74                          const char *start,
  75                          apr_size_t source_len,
  76                          apr_size_t target_len,
  77                          apr_pool_t *pool);
  78
  79
  80 /* Create xdelta window data. Allocate temporary data from POOL. */
  81 void svn_txdelta__xdelta(svn_txdelta__ops_baton_t *build_baton,
  82                          const char *start,
  83                          apr_size_t source_len,
  84                          apr_size_t target_len,
  85                          apr_pool_t *pool);
  86
  87
  88 #ifdef __cplusplus
  89 }
  90 #endif /* __cplusplus */
  91
  92 #endif  /* SVN_LIBSVN_DELTA_H */