Mercurial > hg
annotate mercurial/mpatch_module.c @ 30801:67ee7874e53b
revset: factor out getinteger() helper
We have 4 revset functions that take integer arguments, and they handle
their arguments in slightly different ways. This patch unifies them:
- getstring() in place of getsymbol(), which is more consistent with the
handling of integer revisions (both 1 and '1' are valid)
- say "expects" instead of "requires" for type errors
We don't need to catch TypeError since getstring() must return a string.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Mon, 09 Jan 2017 17:39:44 +0900 |
parents | 155f0cc3f813 |
children | 5fc3459d0493 |
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 static void setpyerr(int r) |
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37 { |
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38 switch (r) { |
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39 case MPATCH_ERR_NO_MEM: |
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40 PyErr_NoMemory(); |
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41 break; |
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42 case MPATCH_ERR_CANNOT_BE_DECODED: |
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43 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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44 break; |
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45 case MPATCH_ERR_INVALID_PATCH: |
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46 PyErr_SetString(mpatch_Error, "invalid patch"); |
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47 break; |
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48 } |
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49 } |
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50 |
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51 struct mpatch_flist *cpygetitem(void *bins, ssize_t pos) |
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52 { |
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53 const char *buffer; |
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54 struct mpatch_flist *res; |
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55 ssize_t blen; |
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56 int r; |
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57 |
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58 PyObject *tmp = PyList_GetItem((PyObject*)bins, pos); |
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59 if (!tmp) |
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60 return NULL; |
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61 if (PyObject_AsCharBuffer(tmp, &buffer, (Py_ssize_t*)&blen)) |
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62 return NULL; |
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63 if ((r = mpatch_decode(buffer, blen, &res)) < 0) { |
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64 if (!PyErr_Occurred()) |
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65 setpyerr(r); |
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66 return NULL; |
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67 } |
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68 return res; |
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69 } |
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70 |
72 | 71 static PyObject * |
72 patches(PyObject *self, PyObject *args) | |
73 { | |
74 PyObject *text, *bins, *result; | |
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75 struct mpatch_flist *patch; |
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76 const char *in; |
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77 int r = 0; |
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78 char *out; |
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79 Py_ssize_t len, outlen, inlen; |
72 | 80 |
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81 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 82 return NULL; |
83 | |
84 len = PyList_Size(bins); | |
85 if (!len) { | |
86 /* nothing to do */ | |
87 Py_INCREF(text); | |
88 return text; | |
89 } | |
90 | |
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91 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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92 return NULL; |
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93 |
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94 patch = mpatch_fold(bins, cpygetitem, 0, len); |
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95 if (!patch) { /* error already set or memory error */ |
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96 if (!PyErr_Occurred()) |
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97 PyErr_NoMemory(); |
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98 return NULL; |
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99 } |
128 | 100 |
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101 outlen = mpatch_calcsize(inlen, patch); |
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102 if (outlen < 0) { |
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103 r = (int)outlen; |
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104 result = NULL; |
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105 goto cleanup; |
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106 } |
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107 result = PyBytes_FromStringAndSize(NULL, outlen); |
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108 if (!result) { |
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109 result = NULL; |
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110 goto cleanup; |
128 | 111 } |
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112 out = PyBytes_AsString(result); |
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113 if ((r = mpatch_apply(out, in, inlen, patch)) < 0) { |
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114 Py_DECREF(result); |
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115 result = NULL; |
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116 } |
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117 cleanup: |
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118 mpatch_lfree(patch); |
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119 if (!result && !PyErr_Occurred()) |
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120 setpyerr(r); |
72 | 121 return result; |
122 } | |
123 | |
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124 /* calculate size of a patched file directly */ |
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125 static PyObject * |
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126 patchedsize(PyObject *self, PyObject *args) |
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127 { |
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128 long orig, start, end, len, outlen = 0, last = 0, pos = 0; |
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129 Py_ssize_t patchlen; |
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130 char *bin; |
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131 |
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132 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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133 return NULL; |
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134 |
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135 while (pos >= 0 && pos < patchlen) { |
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136 start = getbe32(bin + pos); |
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137 end = getbe32(bin + pos + 4); |
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138 len = getbe32(bin + pos + 8); |
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139 if (start > end) |
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140 break; /* sanity check */ |
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141 pos += 12 + len; |
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142 outlen += start - last; |
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143 last = end; |
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144 outlen += len; |
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145 } |
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146 |
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147 if (pos != patchlen) { |
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148 if (!PyErr_Occurred()) |
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149 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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150 return NULL; |
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151 } |
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152 |
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153 outlen += orig - last; |
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154 return Py_BuildValue("l", outlen); |
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155 } |
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156 |
72 | 157 static PyMethodDef methods[] = { |
158 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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159 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 160 {NULL, NULL} |
161 }; | |
162 | |
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163 #ifdef IS_PY3K |
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164 static struct PyModuleDef mpatch_module = { |
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165 PyModuleDef_HEAD_INIT, |
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166 "mpatch", |
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167 mpatch_doc, |
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168 -1, |
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169 methods |
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170 }; |
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171 |
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172 PyMODINIT_FUNC PyInit_mpatch(void) |
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173 { |
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174 PyObject *m; |
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175 |
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176 m = PyModule_Create(&mpatch_module); |
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177 if (m == NULL) |
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178 return NULL; |
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179 |
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180 mpatch_Error = PyErr_NewException("mercurial.mpatch.mpatchError", |
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181 NULL, NULL); |
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182 Py_INCREF(mpatch_Error); |
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183 PyModule_AddObject(m, "mpatchError", mpatch_Error); |
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184 |
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185 return m; |
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186 } |
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187 #else |
72 | 188 PyMODINIT_FUNC |
189 initmpatch(void) | |
190 { | |
191 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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192 mpatch_Error = PyErr_NewException("mercurial.mpatch.mpatchError", |
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193 NULL, NULL); |
72 | 194 } |
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195 #endif |