Mercurial > hg
annotate mercurial/bdiff_module.c @ 31553:56acc4250900
scmutil: add a simple key-value file helper
The purpose of the added class is to serve purposes like save files of shelve
or state files of shelve, rebase and histedit. Keys of these files can be
alphanumeric and start with letters, while values must not contain newlines.
In light of Mercurial's reluctancy to use Python's json module, this tries
to provide a reasonable alternative for a non-nested named data.
Comparing to current approach of storing state in plain text files, where
semantic meaning of lines of text is only determined by their oreder,
simple key-value file allows for reordering lines and thus helps handle
optional values.
Initial use-case I see for this is obs-shelve's shelve files. Later we
can possibly migrate state files to this approach.
The test is in a new file beause I did not figure out where to put it
within existing test suite. If you give me a better idea, I will gladly
follow it.
author | Kostia Balytskyi <ikostia@fb.com> |
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date | Fri, 10 Mar 2017 14:33:42 -0800 |
parents | 08ecec297521 |
children | 4195b84940e9 |
rev | line source |
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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 #include "util.h" |
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21 |
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22 |
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23 static PyObject *blocks(PyObject *self, PyObject *args) |
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24 { |
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25 PyObject *sa, *sb, *rl = NULL, *m; |
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26 struct bdiff_line *a, *b; |
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27 struct bdiff_hunk l, *h; |
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28 int an, bn, count, pos = 0; |
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29 |
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30 l.next = NULL; |
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31 |
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32 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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33 return NULL; |
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34 |
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35 an = bdiff_splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
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36 bn = bdiff_splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
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37 |
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38 if (!a || !b) |
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39 goto nomem; |
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40 |
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41 count = bdiff_diff(a, an, b, bn, &l); |
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42 if (count < 0) |
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43 goto nomem; |
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44 |
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45 rl = PyList_New(count); |
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46 if (!rl) |
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47 goto nomem; |
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48 |
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49 for (h = l.next; h; h = h->next) { |
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50 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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51 PyList_SetItem(rl, pos, m); |
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52 pos++; |
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53 } |
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54 |
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55 nomem: |
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56 free(a); |
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57 free(b); |
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58 bdiff_freehunks(l.next); |
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59 return rl ? rl : PyErr_NoMemory(); |
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60 } |
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61 |
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62 static PyObject *bdiff(PyObject *self, PyObject *args) |
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63 { |
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64 char *sa, *sb, *rb, *ia, *ib; |
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65 PyObject *result = NULL; |
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66 struct bdiff_line *al, *bl; |
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67 struct bdiff_hunk l, *h; |
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68 int an, bn, count; |
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69 Py_ssize_t len = 0, la, lb, li = 0, lcommon = 0, lmax; |
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70 PyThreadState *_save; |
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71 |
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72 l.next = NULL; |
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73 |
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74 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
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75 return NULL; |
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76 |
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77 if (la > UINT_MAX || lb > UINT_MAX) { |
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78 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large"); |
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79 return NULL; |
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80 } |
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81 |
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82 _save = PyEval_SaveThread(); |
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83 |
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84 lmax = la > lb ? lb : la; |
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85 for (ia = sa, ib = sb; |
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86 li < lmax && *ia == *ib; |
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87 ++li, ++ia, ++ib) |
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88 if (*ia == '\n') |
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89 lcommon = li + 1; |
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90 /* we can almost add: if (li == lmax) lcommon = li; */ |
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91 |
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92 an = bdiff_splitlines(sa + lcommon, la - lcommon, &al); |
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93 bn = bdiff_splitlines(sb + lcommon, lb - lcommon, &bl); |
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94 if (!al || !bl) |
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95 goto nomem; |
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96 |
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97 count = bdiff_diff(al, an, bl, bn, &l); |
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98 if (count < 0) |
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99 goto nomem; |
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100 |
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101 /* calculate length of output */ |
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102 la = lb = 0; |
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103 for (h = l.next; h; h = h->next) { |
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104 if (h->a1 != la || h->b1 != lb) |
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105 len += 12 + bl[h->b1].l - bl[lb].l; |
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106 la = h->a2; |
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107 lb = h->b2; |
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108 } |
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109 PyEval_RestoreThread(_save); |
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110 _save = NULL; |
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111 |
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112 result = PyBytes_FromStringAndSize(NULL, len); |
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113 |
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114 if (!result) |
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115 goto nomem; |
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116 |
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117 /* build binary patch */ |
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118 rb = PyBytes_AsString(result); |
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119 la = lb = 0; |
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120 |
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121 for (h = l.next; h; h = h->next) { |
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122 if (h->a1 != la || h->b1 != lb) { |
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123 len = bl[h->b1].l - bl[lb].l; |
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124 putbe32((uint32_t)(al[la].l + lcommon - al->l), rb); |
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125 putbe32((uint32_t)(al[h->a1].l + lcommon - al->l), rb + 4); |
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126 putbe32((uint32_t)len, rb + 8); |
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127 memcpy(rb + 12, bl[lb].l, len); |
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128 rb += 12 + len; |
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129 } |
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130 la = h->a2; |
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131 lb = h->b2; |
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132 } |
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133 |
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134 nomem: |
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135 if (_save) |
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136 PyEval_RestoreThread(_save); |
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137 free(al); |
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138 free(bl); |
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139 bdiff_freehunks(l.next); |
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140 return result ? result : PyErr_NoMemory(); |
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141 } |
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142 |
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143 /* |
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144 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise, |
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145 * reduce whitespace sequences to a single space and trim remaining whitespace |
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146 * from end of lines. |
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147 */ |
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148 static PyObject *fixws(PyObject *self, PyObject *args) |
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149 { |
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150 PyObject *s, *result = NULL; |
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151 char allws, c; |
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152 const char *r; |
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153 Py_ssize_t i, rlen, wlen = 0; |
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154 char *w; |
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155 |
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156 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws)) |
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157 return NULL; |
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158 r = PyBytes_AsString(s); |
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159 rlen = PyBytes_Size(s); |
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160 |
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161 w = (char *)PyMem_Malloc(rlen ? rlen : 1); |
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162 if (!w) |
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163 goto nomem; |
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164 |
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165 for (i = 0; i != rlen; i++) { |
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166 c = r[i]; |
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167 if (c == ' ' || c == '\t' || c == '\r') { |
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168 if (!allws && (wlen == 0 || w[wlen - 1] != ' ')) |
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169 w[wlen++] = ' '; |
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170 } else if (c == '\n' && !allws |
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171 && wlen > 0 && w[wlen - 1] == ' ') { |
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172 w[wlen - 1] = '\n'; |
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173 } else { |
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174 w[wlen++] = c; |
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175 } |
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176 } |
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177 |
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178 result = PyBytes_FromStringAndSize(w, wlen); |
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179 |
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180 nomem: |
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181 PyMem_Free(w); |
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182 return result ? result : PyErr_NoMemory(); |
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183 } |
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184 |
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185 |
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186 static char mdiff_doc[] = "Efficient binary diff."; |
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187 |
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188 static PyMethodDef methods[] = { |
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189 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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190 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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191 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"}, |
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192 {NULL, NULL} |
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193 }; |
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194 |
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195 #ifdef IS_PY3K |
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196 static struct PyModuleDef bdiff_module = { |
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197 PyModuleDef_HEAD_INIT, |
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198 "bdiff", |
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199 mdiff_doc, |
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200 -1, |
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201 methods |
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202 }; |
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203 |
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204 PyMODINIT_FUNC PyInit_bdiff(void) |
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205 { |
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206 return PyModule_Create(&bdiff_module); |
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207 } |
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208 #else |
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209 PyMODINIT_FUNC initbdiff(void) |
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210 { |
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211 Py_InitModule3("bdiff", methods, mdiff_doc); |
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212 } |
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213 #endif |