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annotate mercurial/mpatch_module.c @ 29740:21ac534d7d30

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mpatch: remove superfluous whitespaces
author Yuya Nishihara <yuya@tcha.org>
date Sun, 07 Aug 2016 09:49:07 +0900
parents 55dd12204b8e
children b410e26692a4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 mpatch.c - efficient binary patching for Mercurial
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3
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4 This implements a patch algorithm that's O(m + nlog n) where m is the
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5 size of the output and n is the number of patches.
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6
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7 Given a list of binary patches, it unpacks each into a hunk list,
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8 then combines the hunk lists with a treewise recursion to form a
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9 single hunk list. This hunk list is then applied to the original
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10 text.
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11
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12 The text (or binary) fragments are copied directly from their source
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13 Python objects into a preallocated output string to avoid the
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14 allocation of intermediate Python objects. Working memory is about 2x
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15 the total number of hunks.
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16
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345bac2bc4ec update copyrights.
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17 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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18
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19 This software may be used and distributed according to the terms
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20 of the GNU General Public License, incorporated herein by reference.
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21 */
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22
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23 #define PY_SSIZE_T_CLEAN
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24 #include <Python.h>
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25 #include <stdlib.h>
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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
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33 static char mpatch_doc[] = "Efficient binary patching.";
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34 static PyObject *mpatch_Error;
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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
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56 static PyObject *
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57 patches(PyObject *self, PyObject *args)
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58 {
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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;
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65
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66 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins))
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67 return NULL;
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68
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69 len = PyList_Size(bins);
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70 if (!len) {
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71 /* nothing to do */
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72 Py_INCREF(text);
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73 return text;
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74 }
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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 }
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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;
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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]);
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106 return result;
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107 }
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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
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142 static PyMethodDef methods[] = {
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143 {"patches", patches, METH_VARARGS, "apply a series of patches\n"},
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144 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"},
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145 {NULL, NULL}
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146 };
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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
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173 PyMODINIT_FUNC
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174 initmpatch(void)
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175 {
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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);
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179 }
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180 #endif