tions.
 *
 * @deprecated Provided for backwards compatibility with the 1.3 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_diff3(svn_diff_t **diff,
                    const char *original,
                    const char *modified,
                    const char *latest,
                    apr_pool_t *pool);

/** A convenience function to produce a diff between four files.
 *
 * @since New in 1.4.
 *
 * Return a diff object in @a *diff (allocated from @a pool) that represents
 * the difference between an @a original file, @a modified file, @a latest
 * and @a ancestor file. (The file arguments must be full paths to the files.)
 *
 * Compare lines according to the relevant fields of @a options.
 */
svn_error_t *
svn_diff_file_diff4_2(svn_diff_t **diff,
                      const char *original,
                      const char *modified,
                      const char *latest,
                      const char *ancestor,
                      const svn_diff_file_options_t *options,
                      apr_pool_t *pool);

/** Similar to svn_file_diff4_2(), but with @a options set to a struct with
 * default options.
 *
 * @deprecated Provided for backwards compatibility with the 1.3 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_diff4(svn_diff_t **diff,
                    const char *original,
                    const char *modified,
                    const char *latest,
                    const char *ancestor,
                    apr_pool_t *pool);

/** A convenience function to produce unified diff output from the
 * diff generated by svn_diff_file_diff().
 *
 * Output a @a diff between @a original_path and @a modified_path in unified
 * context diff format to @a output_stream.  Optionally supply
 * @a original_header and/or @a modified_header to be displayed in the header
 * of the output.  If @a original_header or @a modified_header is @c NULL, a
 * default header will be displayed, consisting of path and last modified time.
 * Output all headers and markers in @a header_encoding.  If @a relative_to_dir
 * is not @c NULL, the @a original_path and @a modified_path will have the
 * @a relative_to_dir stripped from the front of the respective paths.  If
 * @a relative_to_dir is @c NULL, paths will be not be modified.  If
 * @a relative_to_dir is not @c NULL but @a relative_to_dir is not a parent
 * path of the target, an error is returned. Finally, if @a relative_to_dir
 * is a URL, an error will be returned.
 *
 * If @a context_size is not negative, then this number of context lines
 * will be used in the generated diff output. Otherwise the legacy compile
 * time default will be used.
 *
 * If not @c NULL, call @a cancel_func with @a cancel_baton once or multiple
 * times while processing larger diffs.
 *
 * @since New in 1.9.
 */
svn_error_t *
svn_diff_file_output_unified4(svn_stream_t *output_stream,
                              svn_diff_t *diff,
                              const char *original_path,
                              const char *modified_path,
                              const char *original_header,
                              const char *modified_header,
                              const char *header_encoding,
                              const char *relative_to_dir,
                              svn_boolean_t show_c_function,
                              int context_size,
                              svn_cancel_func_t cancel_func,
                              void *cancel_baton,
                              apr_pool_t *scratch_pool);

/** Similar to svn_diff_file_output_unified4(), but without cancel
 * support and with @a context_size set to -1.
 *
 * @since New in 1.5.
 * @deprecated Provided for backwards compatibility with the 1.8 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_output_unified3(svn_stream_t *output_stream,
                              svn_diff_t *diff,
                              const char *original_path,
                              const char *modified_path,
                              const char *original_header,
                              const char *modified_header,
                              const char *header_encoding,
                              const char *relative_to_dir,
                              svn_boolean_t show_c_function,
                              apr_pool_t *pool);

/** Similar to svn_diff_file_output_unified3(), but with @a relative_to_dir
 * set to NULL and @a show_c_function to false.
 *
 * @deprecated Provided for backwards compatibility with the 1.4 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_output_unified2(svn_stream_t *output_stream,
                              svn_diff_t *diff,
                              const char *original_path,
                              const char *modified_path,
                              const char *original_header,
                              const char *modified_header,
                              const char *header_encoding,
                              apr_pool_t *pool);

/** Similar to svn_diff_file_output_unified2(), but with @a header_encoding
 * set to @c APR_LOCALE_CHARSET.
 *
 * @deprecated Provided for backward compatibility with the 1.2 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_output_unified(svn_stream_t *output_stream,
                             svn_diff_t *diff,
                             const char *original_path,
                             const char *modified_path,
                             const char *original_header,
                             const char *modified_header,
                             apr_pool_t *pool);


/** A convenience function to produce diff3 output from the
 * diff generated by svn_diff_file_diff3().
 *
 * Output a @a diff between @a original_path, @a modified_path and
 * @a latest_path in merged format to @a output_stream.  Optionally supply
 * @a conflict_modified, @a conflict_original, @a conflict_separator and/or
 * @a conflict_latest to be displayed as conflict markers in the output.
 * If @a conflict_original, @a conflict_modified, @a conflict_latest and/or
 * @a conflict_separator is @c NULL, a default marker will be displayed.
 * @a conflict_style dictates how conflicts are displayed.
 * Uses @a scratch_pool for temporary allocations.
 *
 * If not @c NULL, call @a cancel_func with @a cancel_baton once or multiple
 * times while processing larger diffs.
 *
 * @since New in 1.9.
 */
svn_error_t *
svn_diff_file_output_merge3(svn_stream_t *output_stream,
                            svn_diff_t *diff,
                            const char *original_path,
                            const char *modified_path,
                            const char *latest_path,
                            const char *conflict_original,
                            const char *conflict_modified,
                            const char *conflict_latest,
                            const char *conflict_separator,
                            svn_diff_conflict_display_style_t conflict_style,
                            svn_cancel_func_t cancel_func,
                            void *cancel_baton,
                            apr_pool_t *scratch_pool);

/** Similar to svn_diff_file_output_merge3, but without cancel support.
 *
 * @since New in 1.6.
 *
 * @deprecated Provided for backward compatibility with the 1.8 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_output_merge2(svn_stream_t *output_stream,
                            svn_diff_t *diff,
                            const char *original_path,
                            const char *modified_path,
                            const char *latest_path,
                            const char *conflict_original,
                            const char *conflict_modified,
                            const char *conflict_latest,
                            const char *conflict_separator,
                            svn_diff_conflict_display_style_t conflict_style,
                            apr_pool_t *pool);


/** Similar to svn_diff_file_output_merge2, but with @a
 * display_original_in_conflict and @a display_resolved_conflicts
 * booleans instead of the @a conflict_style enum.
 *
 * If both booleans are false, acts like
 * svn_diff_conflict_display_modified_latest; if @a
 * display_original_in_conflict is true, acts like
 * svn_diff_conflict_display_modified_original_latest; if @a
 * display_resolved_conflicts is true, acts like
 * svn_diff_conflict_display_resolved_modified_latest.  The booleans
 * may not both be true.
 *
 * @deprecated Provided for backward compatibility with the 1.5 API.
 */
SVN_DEPRECATED
svn_error_t *
svn_diff_file_output_merge(svn_stream_t *output_stream,
                           svn_diff_t *diff,
                           const char *original_path,
                           const char *modified_path,
                           const char *latest_path,
                           const char *conflict_original,
                           const char *conflict_modified,
                           const char *conflict_latest,
                           const char *conflict_separator,
                           svn_boolean_t display_original_in_conflict,
                           svn_boolean_t display_resolved_conflicts,
                           apr_pool_t *pool);

/** Creates a git-like binary diff hunk describing the differences between
 * @a original and @a latest. It does this by either producing either the
 * literal content of both versions in a compressed format, or by describing
 * one way transforms.
 *
 * Either @a original or @a latest may be NULL to describe that the version
 * didn't exist.
 *
 * Writes the output to @a output_stream.
 *
 * If not @c NULL, call @a cancel_func with @a cancel_baton once or multiple
 * times while processing larger diffs.
 *
 * @since New in 1.9.
 */
svn_error_t *
svn_diff_output_binary(svn_stream_t *output_stream,
                       svn_stream_t *original,
                       svn_stream_t *latest,
                       svn_cancel_func_t cancel_func,
                       void *cancel_baton,
                       apr_pool_t *scratch_pool);