view mercurial/thirdparty/xdiff/xdiff.h @ 51580:b70628a9aa7e

phases: use revision number in new_heads

All graph operations will be done using revision numbers, so passing nodes only
means they will eventually get converted to revision numbers internally.

As part of an effort to align the code on using revision number we make the
`phases.newheads` function operated on revision number, taking them as input
and using them in returns, instead of the node-id it used to consume and
produce.

This is part of multiple changesets effort to translate more part of the logic,
but is done step by step to facilitate the identification of issue that might
arise in mercurial core and extensions.

To make the change simpler to handle for third party extensions, we also rename
the function, using a more modern form. This will help detecting the different
between the node-id version and the rev-num version.

I also take this as an opportunity to add some comment about possible
performance improvement for the future. They don't matter too much now, but they
are worse exploring in a while.

/*
 *  LibXDiff by Davide Libenzi ( File Differential Library )
 *  Copyright (C) 2003  Davide Libenzi
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, see
 *  <http://www.gnu.org/licenses/>.
 *
 *  Davide Libenzi <[e-mail]>
 *
 */

#if !defined(XDIFF_H)
#define XDIFF_H

#ifdef __cplusplus
extern "C" {
#endif /* #ifdef __cplusplus */

#include <stddef.h> /* size_t */

#if !defined(_MSC_VER) || _MSC_VER >= 1600
#include <stdint.h>
#else
/* prior to Visual Studio 2010 */
typedef long long int64_t;
typedef unsigned long long uint64_t;
#endif

/* xpparm_t.flags */
#define XDF_NEED_MINIMAL (1 << 0)

#define XDF_INDENT_HEURISTIC (1 << 23)

/* emit bdiff-style "matched" (a1, a2, b1, b2) hunks instead of "different"
 * (a1, a2 - a1, b1, b2 - b1) hunks */
#define XDL_EMIT_BDIFFHUNK (1 << 4)

typedef struct s_mmfile {
	char *ptr;
	int64_t size;
} mmfile_t;

typedef struct s_mmbuffer {
	char *ptr;
	int64_t size;
} mmbuffer_t;

typedef struct s_xpparam {
	uint64_t flags;
} xpparam_t;

typedef struct s_xdemitcb {
	void *priv;
} xdemitcb_t;

typedef int (*xdl_emit_hunk_consume_func_t)(int64_t start_a, int64_t count_a,
					    int64_t start_b, int64_t count_b,
					    void *cb_data);

typedef struct s_xdemitconf {
	uint64_t flags;
	xdl_emit_hunk_consume_func_t hunk_func;
} xdemitconf_t;


#define xdl_malloc(x) malloc(x)
#define xdl_free(ptr) free(ptr)
#define xdl_realloc(ptr,x) realloc(ptr,x)

void *xdl_mmfile_first(mmfile_t *mmf, int64_t *size);
int64_t xdl_mmfile_size(mmfile_t *mmf);

int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
	     xdemitconf_t const *xecfg, xdemitcb_t *ecb);

#ifdef __cplusplus
}
#endif /* #ifdef __cplusplus */

#endif /* #if !defined(XDIFF_H) */