annotate mercurial/thirdparty/xdiff/xtypes.h @ 42172:71d8b4d91616 stable

setup: properly package distutils in py2exe virtualenv builds

Our in-repo py2exe packaging code uses virtualenvs for managing
dependencies. An advantage of this is that packaging is more
deterministic and reproducible. Without virtualenvs, we need to
install packages in the system Python install. Packages installed
by other consumers of the system Python could leak into the Mercurial
package.

A regression from this change was that py2exe packages contained
the virtualenv's hacked distutils modules instead of the original
distutils modules. (virtualenv installs a hacked distutils module
because distutils uses relative path lookups that fail when running
from a virtualenv.)

This commit introduces a workaround so py2exe packaging uses the
original distutils modules when running from a virtualenv.

With this change, `import distutils` no longer fails from py2exe
builds produced from a virtualenv. This fixes the regression.
Furthermore, we now include all distutils modules. Before, py2exe's
module finding would only find modules there were explicitly
referenced in code. So, we now package a complete copy of distutils
instead of a partial one. This is even better than before.

# no-check-commit foo_bar function name

/*
 *  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(XTYPES_H)
#define XTYPES_H



typedef struct s_chanode {
	struct s_chanode *next;
	int64_t icurr;
} chanode_t;

typedef struct s_chastore {
	chanode_t *head, *tail;
	int64_t isize, nsize;
	chanode_t *ancur;
	chanode_t *sncur;
	int64_t scurr;
} chastore_t;

typedef struct s_xrecord {
	struct s_xrecord *next;
	char const *ptr;
	int64_t size;
	uint64_t ha;
} xrecord_t;

typedef struct s_xdfile {
	/* manual memory management */
	chastore_t rcha;

	/* number of records (lines) */
	int64_t nrec;

	/* hash table size
	 * the maximum hash value in the table is (1 << hbits) */
	unsigned int hbits;

	/* hash table, hash value => xrecord_t
	 * note: xrecord_t is a linked list. */
	xrecord_t **rhash;

	/* range excluding common prefix and suffix
	 * [recs[i] for i in range(0, dstart)] are common prefix.
	 * [recs[i] for i in range(dstart, dend + 1 - dstart)] are interesting
	 * lines */
	int64_t dstart, dend;

	/* pointer to records (lines) */
	xrecord_t **recs;

	/* record changed, use original "recs" index
	 * rchag[i] can be either 0 or 1. 1 means recs[i] (line i) is marked
	 * "changed". */
	char *rchg;

	/* cleaned-up record index => original "recs" index
	 * clean-up means:
	 *  rule 1. remove common prefix and suffix
	 *  rule 2. remove records that are only on one side, since they can
	 *          not match the other side
	 * rindex[0] is likely dstart, if not removed up by rule 2.
	 * rindex[nreff - 1] is likely dend, if not removed by rule 2.
	 */
	int64_t *rindex;

	/* rindex size */
	int64_t nreff;

	/* cleaned-up record index => hash value
	 * ha[i] = recs[rindex[i]]->ha */
	uint64_t *ha;
} xdfile_t;

typedef struct s_xdfenv {
	xdfile_t xdf1, xdf2;

	/* number of lines for common prefix and suffix that are removed
	 * from xdf1 and xdf2 as a preprocessing step */
	int64_t nprefix, nsuffix;
} xdfenv_t;



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