Mercurial > hg
annotate mercurial/mpatch_module.c @ 29733:bb04f96df51c
wireproto: consolidate code for obtaining "cmds" argument value
Both wireproto.py and sshpeer.py had code for producing the value to
the "cmds" argument used by the "batch" command. This patch extracts
that code to a standalone function and uses it.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 06 Aug 2016 13:46:28 -0700 |
parents | 55dd12204b8e |
children | 21ac534d7d30 |
rev | line source |
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72 | 1 /* |
2 mpatch.c - efficient binary patching for Mercurial | |
3 | |
4 This implements a patch algorithm that's O(m + nlog n) where m is the | |
5 size of the output and n is the number of patches. | |
6 | |
7 Given a list of binary patches, it unpacks each into a hunk list, | |
8 then combines the hunk lists with a treewise recursion to form a | |
9 single hunk list. This hunk list is then applied to the original | |
10 text. | |
11 | |
12 The text (or binary) fragments are copied directly from their source | |
13 Python objects into a preallocated output string to avoid the | |
14 allocation of intermediate Python objects. Working memory is about 2x | |
15 the total number of hunks. | |
16 | |
2859 | 17 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
72 | 18 |
19 This software may be used and distributed according to the terms | |
20 of the GNU General Public License, incorporated herein by reference. | |
21 */ | |
22 | |
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23 #define PY_SSIZE_T_CLEAN |
72 | 24 #include <Python.h> |
25 #include <stdlib.h> | |
26 #include <string.h> | |
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27 |
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28 #include "util.h" |
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29 #include "bitmanipulation.h" |
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30 #include "compat.h" |
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31 #include "mpatch.h" |
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32 |
72 | 33 static char mpatch_doc[] = "Efficient binary patching."; |
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34 static PyObject *mpatch_Error; |
72 | 35 |
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36 struct mpatch_flist *cpygetitem(void *bins, ssize_t pos) |
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37 { |
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38 const char *buffer; |
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39 struct mpatch_flist *res; |
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40 ssize_t blen; |
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41 int r; |
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42 |
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43 PyObject *tmp = PyList_GetItem((PyObject*)bins, pos); |
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44 if (!tmp) |
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45 return NULL; |
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46 if (PyObject_AsCharBuffer(tmp, &buffer, (Py_ssize_t*)&blen)) |
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47 return NULL; |
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48 if ((r = mpatch_decode(buffer, blen, &res)) < 0) { |
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49 if (!PyErr_Occurred()) |
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50 PyErr_SetString(mpatch_Error, mpatch_errors[-r]); |
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51 return NULL; |
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52 } |
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53 return res; |
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54 } |
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55 |
72 | 56 static PyObject * |
57 patches(PyObject *self, PyObject *args) | |
58 { | |
59 PyObject *text, *bins, *result; | |
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60 struct mpatch_flist *patch; |
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61 const char *in; |
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62 int r; |
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63 char *out; |
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64 Py_ssize_t len, outlen, inlen; |
72 | 65 |
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66 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 67 return NULL; |
68 | |
69 len = PyList_Size(bins); | |
70 if (!len) { | |
71 /* nothing to do */ | |
72 Py_INCREF(text); | |
73 return text; | |
74 } | |
75 | |
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76 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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77 return NULL; |
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78 |
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79 patch = mpatch_fold(bins, cpygetitem, 0, len); |
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80 if (!patch) { /* error already set or memory error */ |
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81 if (!PyErr_Occurred()) |
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82 PyErr_NoMemory(); |
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83 return NULL; |
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84 } |
128 | 85 |
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86 outlen = mpatch_calcsize(inlen, patch); |
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87 if (outlen < 0) { |
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88 r = (int)outlen; |
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89 result = NULL; |
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90 goto cleanup; |
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91 } |
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92 result = PyBytes_FromStringAndSize(NULL, outlen); |
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93 if (!result) { |
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94 result = NULL; |
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95 goto cleanup; |
128 | 96 } |
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97 out = PyBytes_AsString(result); |
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98 if ((r = mpatch_apply(out, in, inlen, patch)) < 0) { |
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99 Py_DECREF(result); |
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100 result = NULL; |
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101 } |
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102 cleanup: |
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103 mpatch_lfree(patch); |
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104 if (!result && !PyErr_Occurred()) |
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105 PyErr_SetString(mpatch_Error, mpatch_errors[-r]); |
72 | 106 return result; |
107 } | |
108 | |
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109 /* calculate size of a patched file directly */ |
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110 static PyObject * |
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111 patchedsize(PyObject *self, PyObject *args) |
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112 { |
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113 long orig, start, end, len, outlen = 0, last = 0, pos = 0; |
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114 Py_ssize_t patchlen; |
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115 char *bin; |
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116 |
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117 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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118 return NULL; |
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119 |
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120 while (pos >= 0 && pos < patchlen) { |
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121 start = getbe32(bin + pos); |
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122 end = getbe32(bin + pos + 4); |
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123 len = getbe32(bin + pos + 8); |
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124 if (start > end) |
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125 break; /* sanity check */ |
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126 pos += 12 + len; |
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127 outlen += start - last; |
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128 last = end; |
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129 outlen += len; |
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130 } |
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131 |
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132 if (pos != patchlen) { |
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133 if (!PyErr_Occurred()) |
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134 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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135 return NULL; |
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136 } |
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137 |
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138 outlen += orig - last; |
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139 return Py_BuildValue("l", outlen); |
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140 } |
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141 |
72 | 142 static PyMethodDef methods[] = { |
143 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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144 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 145 {NULL, NULL} |
146 }; | |
147 | |
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148 #ifdef IS_PY3K |
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149 static struct PyModuleDef mpatch_module = { |
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150 PyModuleDef_HEAD_INIT, |
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151 "mpatch", |
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152 mpatch_doc, |
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153 -1, |
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154 methods |
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155 }; |
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156 |
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157 PyMODINIT_FUNC PyInit_mpatch(void) |
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158 { |
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159 PyObject *m; |
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160 |
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161 m = PyModule_Create(&mpatch_module); |
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162 if (m == NULL) |
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163 return NULL; |
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164 |
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165 mpatch_Error = PyErr_NewException("mercurial.mpatch.mpatchError", |
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166 NULL, NULL); |
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167 Py_INCREF(mpatch_Error); |
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168 PyModule_AddObject(m, "mpatchError", mpatch_Error); |
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169 |
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170 return m; |
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171 } |
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172 #else |
72 | 173 PyMODINIT_FUNC |
174 initmpatch(void) | |
175 { | |
176 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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177 mpatch_Error = PyErr_NewException("mercurial.mpatch.mpatchError", |
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178 NULL, NULL); |
72 | 179 } |
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180 #endif |