--- a/mercurial/bdiff_module.c	Wed Jul 05 11:24:22 2017 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,213 +0,0 @@
-/*
- bdiff.c - efficient binary diff extension for Mercurial
-
- Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
-
- This software may be used and distributed according to the terms of
- the GNU General Public License, incorporated herein by reference.
-
- Based roughly on Python difflib
-*/
-
-#define PY_SSIZE_T_CLEAN
-#include <Python.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-
-#include "bdiff.h"
-#include "bitmanipulation.h"
-#include "util.h"
-
-
-static PyObject *blocks(PyObject *self, PyObject *args)
-{
-	PyObject *sa, *sb, *rl = NULL, *m;
-	struct bdiff_line *a, *b;
-	struct bdiff_hunk l, *h;
-	int an, bn, count, pos = 0;
-
-	l.next = NULL;
-
-	if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
-		return NULL;
-
-	an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a);
-	bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b);
-
-	if (!a || !b)
-		goto nomem;
-
-	count = bdiff_diff(a, an, b, bn, &l);
-	if (count < 0)
-		goto nomem;
-
-	rl = PyList_New(count);
-	if (!rl)
-		goto nomem;
-
-	for (h = l.next; h; h = h->next) {
-		m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2);
-		PyList_SetItem(rl, pos, m);
-		pos++;
-	}
-
-nomem:
-	free(a);
-	free(b);
-	bdiff_freehunks(l.next);
-	return rl ? rl : PyErr_NoMemory();
-}
-
-static PyObject *bdiff(PyObject *self, PyObject *args)
-{
-	char *sa, *sb, *rb, *ia, *ib;
-	PyObject *result = NULL;
-	struct bdiff_line *al, *bl;
-	struct bdiff_hunk l, *h;
-	int an, bn, count;
-	Py_ssize_t len = 0, la, lb, li = 0, lcommon = 0, lmax;
-	PyThreadState *_save;
-
-	l.next = NULL;
-
-	if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb))
-		return NULL;
-
-	if (la > UINT_MAX || lb > UINT_MAX) {
-		PyErr_SetString(PyExc_ValueError, "bdiff inputs too large");
-		return NULL;
-	}
-
-	_save = PyEval_SaveThread();
-
-	lmax = la > lb ? lb : la;
-	for (ia = sa, ib = sb;
-	     li < lmax && *ia == *ib;
-	     ++li, ++ia, ++ib)
-		if (*ia == '\n')
-			lcommon = li + 1;
-	/* we can almost add: if (li == lmax) lcommon = li; */
-
-	an = bdiff_splitlines(sa + lcommon, la - lcommon, &al);
-	bn = bdiff_splitlines(sb + lcommon, lb - lcommon, &bl);
-	if (!al || !bl)
-		goto nomem;
-
-	count = bdiff_diff(al, an, bl, bn, &l);
-	if (count < 0)
-		goto nomem;
-
-	/* calculate length of output */
-	la = lb = 0;
-	for (h = l.next; h; h = h->next) {
-		if (h->a1 != la || h->b1 != lb)
-			len += 12 + bl[h->b1].l - bl[lb].l;
-		la = h->a2;
-		lb = h->b2;
-	}
-	PyEval_RestoreThread(_save);
-	_save = NULL;
-
-	result = PyBytes_FromStringAndSize(NULL, len);
-
-	if (!result)
-		goto nomem;
-
-	/* build binary patch */
-	rb = PyBytes_AsString(result);
-	la = lb = 0;
-
-	for (h = l.next; h; h = h->next) {
-		if (h->a1 != la || h->b1 != lb) {
-			len = bl[h->b1].l - bl[lb].l;
-			putbe32((uint32_t)(al[la].l + lcommon - al->l), rb);
-			putbe32((uint32_t)(al[h->a1].l + lcommon - al->l), rb + 4);
-			putbe32((uint32_t)len, rb + 8);
-			memcpy(rb + 12, bl[lb].l, len);
-			rb += 12 + len;
-		}
-		la = h->a2;
-		lb = h->b2;
-	}
-
-nomem:
-	if (_save)
-		PyEval_RestoreThread(_save);
-	free(al);
-	free(bl);
-	bdiff_freehunks(l.next);
-	return result ? result : PyErr_NoMemory();
-}
-
-/*
- * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise,
- * reduce whitespace sequences to a single space and trim remaining whitespace
- * from end of lines.
- */
-static PyObject *fixws(PyObject *self, PyObject *args)
-{
-	PyObject *s, *result = NULL;
-	char allws, c;
-	const char *r;
-	Py_ssize_t i, rlen, wlen = 0;
-	char *w;
-
-	if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws))
-		return NULL;
-	r = PyBytes_AsString(s);
-	rlen = PyBytes_Size(s);
-
-	w = (char *)PyMem_Malloc(rlen ? rlen : 1);
-	if (!w)
-		goto nomem;
-
-	for (i = 0; i != rlen; i++) {
-		c = r[i];
-		if (c == ' ' || c == '\t' || c == '\r') {
-			if (!allws && (wlen == 0 || w[wlen - 1] != ' '))
-				w[wlen++] = ' ';
-		} else if (c == '\n' && !allws
-			  && wlen > 0 && w[wlen - 1] == ' ') {
-			w[wlen - 1] = '\n';
-		} else {
-			w[wlen++] = c;
-		}
-	}
-
-	result = PyBytes_FromStringAndSize(w, wlen);
-
-nomem:
-	PyMem_Free(w);
-	return result ? result : PyErr_NoMemory();
-}
-
-
-static char mdiff_doc[] = "Efficient binary diff.";
-
-static PyMethodDef methods[] = {
-	{"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"},
-	{"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"},
-	{"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"},
-	{NULL, NULL}
-};
-
-#ifdef IS_PY3K
-static struct PyModuleDef bdiff_module = {
-	PyModuleDef_HEAD_INIT,
-	"bdiff",
-	mdiff_doc,
-	-1,
-	methods
-};
-
-PyMODINIT_FUNC PyInit_bdiff(void)
-{
-	return PyModule_Create(&bdiff_module);
-}
-#else
-PyMODINIT_FUNC initbdiff(void)
-{
-	Py_InitModule3("bdiff", methods, mdiff_doc);
-}
-#endif