annotate mercurial/bdiff_module.c @ 29587:536eec443b4a

commandserver: rename _serveworker() to _runworker() "run" sounds more natural as the function does never listen for new connection.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 16 Jul 2016 14:46:31 +0900
parents 9631ff5ebbeb
children 15635d8b17e0
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29541
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1 /*
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2 bdiff.c - efficient binary diff extension for Mercurial
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3
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4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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5
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6 This software may be used and distributed according to the terms of
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7 the GNU General Public License, incorporated herein by reference.
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8
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9 Based roughly on Python difflib
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10 */
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11
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12 #define PY_SSIZE_T_CLEAN
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13 #include <Python.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include <limits.h>
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17
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18 #include "bdiff.h"
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19 #include "bitmanipulation.h"
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20
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21
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22 static PyObject *blocks(PyObject *self, PyObject *args)
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23 {
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24 PyObject *sa, *sb, *rl = NULL, *m;
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25 struct bdiff_line *a, *b;
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26 struct bdiff_hunk l, *h;
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27 int an, bn, count, pos = 0;
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28
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29 l.next = NULL;
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30
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31 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
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32 return NULL;
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33
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34 an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a);
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35 bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b);
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36
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37 if (!a || !b)
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38 goto nomem;
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39
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40 count = bdiff_diff(a, an, b, bn, &l);
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41 if (count < 0)
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42 goto nomem;
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43
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44 rl = PyList_New(count);
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45 if (!rl)
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46 goto nomem;
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47
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48 for (h = l.next; h; h = h->next) {
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49 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2);
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50 PyList_SetItem(rl, pos, m);
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51 pos++;
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52 }
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53
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54 nomem:
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55 free(a);
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56 free(b);
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57 bdiff_freehunks(l.next);
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58 return rl ? rl : PyErr_NoMemory();
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59 }
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60
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61 static PyObject *bdiff(PyObject *self, PyObject *args)
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62 {
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63 char *sa, *sb, *rb;
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64 PyObject *result = NULL;
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65 struct bdiff_line *al, *bl;
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66 struct bdiff_hunk l, *h;
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67 int an, bn, count;
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68 Py_ssize_t len = 0, la, lb;
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69 PyThreadState *_save;
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70
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71 l.next = NULL;
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72
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73 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb))
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74 return NULL;
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75
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76 if (la > UINT_MAX || lb > UINT_MAX) {
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77 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large");
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78 return NULL;
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79 }
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80
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81 _save = PyEval_SaveThread();
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82 an = bdiff_splitlines(sa, la, &al);
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83 bn = bdiff_splitlines(sb, lb, &bl);
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84 if (!al || !bl)
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85 goto nomem;
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86
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87 count = bdiff_diff(al, an, bl, bn, &l);
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88 if (count < 0)
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89 goto nomem;
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90
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91 /* calculate length of output */
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92 la = lb = 0;
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93 for (h = l.next; h; h = h->next) {
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94 if (h->a1 != la || h->b1 != lb)
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95 len += 12 + bl[h->b1].l - bl[lb].l;
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96 la = h->a2;
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97 lb = h->b2;
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98 }
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99 PyEval_RestoreThread(_save);
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100 _save = NULL;
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101
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102 result = PyBytes_FromStringAndSize(NULL, len);
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103
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104 if (!result)
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105 goto nomem;
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106
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107 /* build binary patch */
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108 rb = PyBytes_AsString(result);
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109 la = lb = 0;
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110
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111 for (h = l.next; h; h = h->next) {
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112 if (h->a1 != la || h->b1 != lb) {
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113 len = bl[h->b1].l - bl[lb].l;
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114 putbe32((uint32_t)(al[la].l - al->l), rb);
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115 putbe32((uint32_t)(al[h->a1].l - al->l), rb + 4);
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116 putbe32((uint32_t)len, rb + 8);
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117 memcpy(rb + 12, bl[lb].l, len);
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118 rb += 12 + len;
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119 }
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120 la = h->a2;
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121 lb = h->b2;
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122 }
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123
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124 nomem:
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125 if (_save)
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126 PyEval_RestoreThread(_save);
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127 free(al);
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128 free(bl);
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129 bdiff_freehunks(l.next);
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130 return result ? result : PyErr_NoMemory();
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131 }
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132
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133 /*
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134 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise,
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135 * reduce whitespace sequences to a single space and trim remaining whitespace
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136 * from end of lines.
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137 */
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138 static PyObject *fixws(PyObject *self, PyObject *args)
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139 {
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140 PyObject *s, *result = NULL;
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141 char allws, c;
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142 const char *r;
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143 Py_ssize_t i, rlen, wlen = 0;
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144 char *w;
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145
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146 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws))
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147 return NULL;
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148 r = PyBytes_AsString(s);
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149 rlen = PyBytes_Size(s);
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150
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151 w = (char *)malloc(rlen ? rlen : 1);
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152 if (!w)
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153 goto nomem;
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154
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155 for (i = 0; i != rlen; i++) {
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156 c = r[i];
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157 if (c == ' ' || c == '\t' || c == '\r') {
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158 if (!allws && (wlen == 0 || w[wlen - 1] != ' '))
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159 w[wlen++] = ' ';
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160 } else if (c == '\n' && !allws
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161 && wlen > 0 && w[wlen - 1] == ' ') {
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162 w[wlen - 1] = '\n';
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163 } else {
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164 w[wlen++] = c;
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165 }
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166 }
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167
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168 result = PyBytes_FromStringAndSize(w, wlen);
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169
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170 nomem:
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171 free(w);
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172 return result ? result : PyErr_NoMemory();
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173 }
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174
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175
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176 static char mdiff_doc[] = "Efficient binary diff.";
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177
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178 static PyMethodDef methods[] = {
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179 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"},
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180 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"},
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181 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"},
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182 {NULL, NULL}
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183 };
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184
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185 #ifdef IS_PY3K
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186 static struct PyModuleDef bdiff_module = {
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187 PyModuleDef_HEAD_INIT,
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188 "bdiff",
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189 mdiff_doc,
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190 -1,
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191 methods
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192 };
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193
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194 PyMODINIT_FUNC PyInit_bdiff(void)
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195 {
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196 return PyModule_Create(&bdiff_module);
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197 }
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198 #else
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199 PyMODINIT_FUNC initbdiff(void)
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200 {
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201 Py_InitModule3("bdiff", methods, mdiff_doc);
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202 }
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203 #endif