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@@ -1,248 +1,415 b'' | |||
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1 | 1 | /* |
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2 | 2 | parsers.c - efficient content parsing |
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3 | 3 | |
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4 | 4 | Copyright 2008 Matt Mackall <mpm@selenic.com> and others |
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5 | 5 | |
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6 | 6 | This software may be used and distributed according to the terms of |
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7 | 7 | the GNU General Public License, incorporated herein by reference. |
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8 | 8 | */ |
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9 | 9 | |
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10 | 10 | #include <Python.h> |
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11 | 11 | #include <ctype.h> |
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12 | 12 | #include <string.h> |
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13 | 13 | |
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14 | 14 | static int hexdigit(char c) |
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15 | 15 | { |
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16 | 16 | if (c >= '0' && c <= '9') |
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17 | 17 | return c - '0'; |
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18 | 18 | if (c >= 'a' && c <= 'f') |
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19 | 19 | return c - 'a' + 10; |
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20 | 20 | if (c >= 'A' && c <= 'F') |
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21 | 21 | return c - 'A' + 10; |
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22 | 22 | |
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23 | 23 | PyErr_SetString(PyExc_ValueError, "input contains non-hex character"); |
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24 | 24 | return 0; |
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25 | 25 | } |
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26 | 26 | |
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27 | 27 | /* |
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28 | 28 | * Turn a hex-encoded string into binary. |
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29 | 29 | */ |
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30 | 30 | static PyObject *unhexlify(const char *str, int len) |
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31 | 31 | { |
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32 | 32 | PyObject *ret; |
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33 | 33 | const char *c; |
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34 | 34 | char *d; |
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35 | 35 | |
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36 | 36 | ret = PyString_FromStringAndSize(NULL, len / 2); |
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37 | 37 | if (!ret) |
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38 | 38 | return NULL; |
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39 | 39 | |
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40 | 40 | d = PyString_AS_STRING(ret); |
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41 | 41 | for (c = str; c < str + len;) { |
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42 | 42 | int hi = hexdigit(*c++); |
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43 | 43 | int lo = hexdigit(*c++); |
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44 | 44 | *d++ = (hi << 4) | lo; |
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45 | 45 | } |
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46 | 46 | |
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47 | 47 | return ret; |
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48 | 48 | } |
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49 | 49 | |
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50 | 50 | /* |
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51 | 51 | * This code assumes that a manifest is stitched together with newline |
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52 | 52 | * ('\n') characters. |
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53 | 53 | */ |
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54 | 54 | static PyObject *parse_manifest(PyObject *self, PyObject *args) |
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55 | 55 | { |
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56 | 56 | PyObject *mfdict, *fdict; |
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57 | 57 | char *str, *cur, *start, *zero; |
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58 | 58 | int len; |
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59 | 59 | |
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60 | 60 | if (!PyArg_ParseTuple(args, "O!O!s#:parse_manifest", |
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61 | 61 | &PyDict_Type, &mfdict, |
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62 | 62 | &PyDict_Type, &fdict, |
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63 | 63 | &str, &len)) |
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64 | 64 | goto quit; |
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65 | 65 | |
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66 | 66 | for (start = cur = str, zero = NULL; cur < str + len; cur++) { |
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67 | 67 | PyObject *file = NULL, *node = NULL; |
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68 | 68 | PyObject *flags = NULL; |
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69 | 69 | int nlen; |
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70 | 70 | |
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71 | 71 | if (!*cur) { |
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72 | 72 | zero = cur; |
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73 | 73 | continue; |
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74 | 74 | } |
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75 | 75 | else if (*cur != '\n') |
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76 | 76 | continue; |
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77 | 77 | |
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78 | 78 | if (!zero) { |
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79 | 79 | PyErr_SetString(PyExc_ValueError, |
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80 | 80 | "manifest entry has no separator"); |
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81 | 81 | goto quit; |
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82 | 82 | } |
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83 | 83 | |
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84 | 84 | file = PyString_FromStringAndSize(start, zero - start); |
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85 | 85 | if (!file) |
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86 | 86 | goto bail; |
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87 | 87 | |
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88 | 88 | nlen = cur - zero - 1; |
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89 | 89 | |
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90 | 90 | node = unhexlify(zero + 1, nlen > 40 ? 40 : nlen); |
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91 | 91 | if (!node) |
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92 | 92 | goto bail; |
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93 | 93 | |
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94 | 94 | if (nlen > 40) { |
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95 | 95 | PyObject *flags; |
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96 | 96 | |
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97 | 97 | flags = PyString_FromStringAndSize(zero + 41, |
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98 | 98 | nlen - 40); |
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99 | 99 | if (!flags) |
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100 | 100 | goto bail; |
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101 | 101 | |
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102 | 102 | if (PyDict_SetItem(fdict, file, flags) == -1) |
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103 | 103 | goto bail; |
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104 | 104 | } |
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105 | 105 | |
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106 | 106 | if (PyDict_SetItem(mfdict, file, node) == -1) |
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107 | 107 | goto bail; |
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108 | 108 | |
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109 | 109 | start = cur + 1; |
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110 | 110 | zero = NULL; |
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111 | 111 | |
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112 | 112 | Py_XDECREF(flags); |
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113 | 113 | Py_XDECREF(node); |
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114 | 114 | Py_XDECREF(file); |
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115 | 115 | continue; |
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116 | 116 | bail: |
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117 | 117 | Py_XDECREF(flags); |
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118 | 118 | Py_XDECREF(node); |
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119 | 119 | Py_XDECREF(file); |
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120 | 120 | goto quit; |
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121 | 121 | } |
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122 | 122 | |
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123 | 123 | if (len > 0 && *(cur - 1) != '\n') { |
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124 | 124 | PyErr_SetString(PyExc_ValueError, |
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125 | 125 | "manifest contains trailing garbage"); |
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126 | 126 | goto quit; |
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127 | 127 | } |
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128 | 128 | |
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129 | 129 | Py_INCREF(Py_None); |
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130 | 130 | return Py_None; |
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131 | 131 | quit: |
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132 | 132 | return NULL; |
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133 | 133 | } |
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134 | 134 | |
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135 | 135 | #ifdef _WIN32 |
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136 | 136 | # ifdef _MSC_VER |
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137 | 137 | /* msvc 6.0 has problems */ |
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138 | 138 | # define inline __inline |
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139 | 139 | typedef unsigned long uint32_t; |
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140 | 140 | # else |
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141 | 141 | # include <stdint.h> |
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142 | 142 | # endif |
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143 | 143 | static uint32_t ntohl(uint32_t x) |
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144 | 144 | { |
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145 | 145 | return ((x & 0x000000ffUL) << 24) | |
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146 | 146 | ((x & 0x0000ff00UL) << 8) | |
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147 | 147 | ((x & 0x00ff0000UL) >> 8) | |
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148 | 148 | ((x & 0xff000000UL) >> 24); |
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149 | 149 | } |
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150 | 150 | #else |
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151 | 151 | /* not windows */ |
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152 | 152 | # include <sys/types.h> |
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153 | 153 | # if defined __BEOS__ && !defined __HAIKU__ |
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154 | 154 | # include <ByteOrder.h> |
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155 | 155 | # else |
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156 | 156 | # include <arpa/inet.h> |
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157 | 157 | # endif |
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158 | 158 | # include <inttypes.h> |
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159 | 159 | #endif |
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160 | 160 | |
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161 | 161 | static PyObject *parse_dirstate(PyObject *self, PyObject *args) |
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162 | 162 | { |
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163 | 163 | PyObject *dmap, *cmap, *parents = NULL, *ret = NULL; |
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164 | 164 | PyObject *fname = NULL, *cname = NULL, *entry = NULL; |
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165 | 165 | char *str, *cur, *end, *cpos; |
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166 | 166 | int state, mode, size, mtime, flen; |
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167 | 167 | int len; |
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168 | 168 | char decode[16]; /* for alignment */ |
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169 | 169 | |
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170 | 170 | if (!PyArg_ParseTuple(args, "O!O!s#:parse_dirstate", |
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171 | 171 | &PyDict_Type, &dmap, |
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172 | 172 | &PyDict_Type, &cmap, |
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173 | 173 | &str, &len)) |
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174 | 174 | goto quit; |
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175 | 175 | |
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176 | 176 | /* read parents */ |
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177 | 177 | if (len < 40) |
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178 | 178 | goto quit; |
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179 | 179 | |
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180 | 180 | parents = Py_BuildValue("s#s#", str, 20, str + 20, 20); |
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181 | 181 | if (!parents) |
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182 | 182 | goto quit; |
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183 | 183 | |
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184 | 184 | /* read filenames */ |
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185 | 185 | cur = str + 40; |
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186 | 186 | end = str + len; |
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187 | 187 | |
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188 | 188 | while (cur < end - 17) { |
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189 | 189 | /* unpack header */ |
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190 | 190 | state = *cur; |
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191 | 191 | memcpy(decode, cur + 1, 16); |
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192 | 192 | mode = ntohl(*(uint32_t *)(decode)); |
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193 | 193 | size = ntohl(*(uint32_t *)(decode + 4)); |
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194 | 194 | mtime = ntohl(*(uint32_t *)(decode + 8)); |
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195 | 195 | flen = ntohl(*(uint32_t *)(decode + 12)); |
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196 | 196 | cur += 17; |
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197 | 197 | if (cur + flen > end) |
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198 | 198 | goto quit; |
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199 | 199 | |
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200 | 200 | entry = Py_BuildValue("ciii", state, mode, size, mtime); |
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201 | 201 | PyObject_GC_UnTrack(entry); /* don't waste time with this */ |
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202 | 202 | if (!entry) |
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203 | 203 | goto quit; |
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204 | 204 | |
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205 | 205 | cpos = memchr(cur, 0, flen); |
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206 | 206 | if (cpos) { |
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207 | 207 | fname = PyString_FromStringAndSize(cur, cpos - cur); |
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208 | 208 | cname = PyString_FromStringAndSize(cpos + 1, |
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209 | 209 | flen - (cpos - cur) - 1); |
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210 | 210 | if (!fname || !cname || |
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211 | 211 | PyDict_SetItem(cmap, fname, cname) == -1 || |
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212 | 212 | PyDict_SetItem(dmap, fname, entry) == -1) |
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213 | 213 | goto quit; |
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214 | 214 | Py_DECREF(cname); |
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215 | 215 | } else { |
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216 | 216 | fname = PyString_FromStringAndSize(cur, flen); |
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217 | 217 | if (!fname || |
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218 | 218 | PyDict_SetItem(dmap, fname, entry) == -1) |
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219 | 219 | goto quit; |
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220 | 220 | } |
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221 | 221 | cur += flen; |
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222 | 222 | Py_DECREF(fname); |
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223 | 223 | Py_DECREF(entry); |
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224 | 224 | fname = cname = entry = NULL; |
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225 | 225 | } |
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226 | 226 | |
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227 | 227 | ret = parents; |
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228 | 228 | Py_INCREF(ret); |
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229 | 229 | quit: |
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230 | 230 | Py_XDECREF(fname); |
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231 | 231 | Py_XDECREF(cname); |
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232 | 232 | Py_XDECREF(entry); |
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233 | 233 | Py_XDECREF(parents); |
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234 | 234 | return ret; |
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235 | 235 | } |
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236 | 236 | |
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237 | ||
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238 | static inline uint64_t ntohll(uint64_t x) | |
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239 | { | |
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240 | return (((uint64_t)ntohl((uint32_t)x)) << 32) | | |
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241 | (uint64_t)ntohl((uint32_t)(x >> 32)); | |
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242 | } | |
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243 | ||
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244 | const char nullid[20]; | |
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245 | const int nullrev = -1; | |
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246 | ||
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247 | /* RevlogNG format (all in big endian, data may be inlined): | |
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248 | * 6 bytes: offset | |
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249 | * 2 bytes: flags | |
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250 | * 4 bytes: compressed length | |
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251 | * 4 bytes: uncompressed length | |
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252 | * 4 bytes: base revision | |
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253 | * 4 bytes: link revision | |
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254 | * 4 bytes: parent 1 revision | |
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255 | * 4 bytes: parent 2 revision | |
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256 | * 32 bytes: nodeid (only 20 bytes used) | |
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257 | */ | |
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258 | static int _parse_index_ng (const char *data, int size, int inlined, | |
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259 | PyObject *index, PyObject *nodemap) | |
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260 | { | |
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261 | PyObject *entry = NULL, *node_id = NULL, *n_obj = NULL; | |
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262 | PyObject *nullrev_obj = NULL, *nullid_obj = NULL; | |
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263 | int comp_len, uncomp_len, base_rev, link_rev, parent_1, parent_2; | |
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264 | uint64_t offset_flags; | |
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265 | int n = 0; | |
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266 | const char *end = data + size; | |
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267 | ||
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268 | while (data < end) { | |
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269 | offset_flags = ntohll(*((uint64_t *) data)); | |
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270 | if (n == 0) /* mask out version number for the first entry */ | |
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271 | offset_flags &= 0xFFFF; | |
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272 | ||
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273 | comp_len = ntohl(*((uint32_t *) (data + 8))); | |
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274 | uncomp_len = ntohl(*((uint32_t *) (data + 12))); | |
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275 | base_rev = ntohl(*((uint32_t *) (data + 16))); | |
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276 | link_rev = ntohl(*((uint32_t *) (data + 20))); | |
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277 | parent_1 = ntohl(*((uint32_t *) (data + 24))); | |
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278 | parent_2 = ntohl(*((uint32_t *) (data + 28))); | |
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279 | node_id = PyString_FromStringAndSize(data + 32, 20); | |
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280 | n_obj = PyInt_FromLong(n); | |
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281 | if (!node_id || !n_obj || | |
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282 | PyDict_SetItem(nodemap, node_id, n_obj) != 0) | |
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283 | goto quit; | |
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284 | Py_DECREF(n_obj); | |
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285 | ||
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286 | entry = Py_BuildValue("LiiiiiiN", offset_flags, comp_len, | |
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287 | uncomp_len, base_rev, link_rev, | |
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288 | parent_1, parent_2, node_id); | |
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289 | PyObject_GC_UnTrack(entry); /* don't waste time with this */ | |
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290 | if (!entry) | |
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291 | goto quit; | |
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292 | ||
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293 | /* append to or set value in the index list */ | |
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294 | if (inlined) { | |
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295 | if (PyList_Append(index, entry) != 0) | |
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296 | goto quit; | |
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297 | Py_DECREF(entry); | |
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298 | } else { | |
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299 | PyList_SET_ITEM(index, n, entry); /* steals reference */ | |
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300 | } | |
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301 | ||
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302 | data += 64 + (inlined ? comp_len : 0); | |
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303 | n++; | |
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304 | } | |
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305 | if (data > end) { | |
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306 | if (!PyErr_Occurred()) | |
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307 | PyErr_SetString(PyExc_ValueError, "corrupt index file"); | |
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308 | goto quit; | |
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309 | } | |
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310 | ||
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311 | /* create the nullid/nullrev entry in the nodemap and the | |
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312 | * magic nullid entry in the index at [-1] */ | |
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313 | nullid_obj = PyString_FromStringAndSize(nullid, 20); | |
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314 | nullrev_obj = PyInt_FromLong(nullrev); | |
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315 | if (!nodemap || !nullid_obj || !nullrev_obj || | |
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316 | PyDict_SetItem(nodemap, nullid_obj, nullrev_obj) != 0) | |
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317 | goto quit; | |
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318 | Py_DECREF(nullrev_obj); | |
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319 | ||
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320 | entry = Py_BuildValue("iiiiiiiN", 0, 0, 0, -1, -1, -1, -1, nullid_obj); | |
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321 | PyObject_GC_UnTrack(entry); /* don't waste time with this */ | |
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322 | if (!entry) | |
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323 | goto quit; | |
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324 | if (inlined) { | |
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325 | if (PyList_Append(index, entry) != 0) | |
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326 | goto quit; | |
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327 | Py_DECREF(entry); | |
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328 | } else { | |
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329 | PyList_SET_ITEM(index, n, entry); /* steals reference */ | |
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330 | } | |
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331 | ||
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332 | return 1; | |
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333 | ||
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334 | quit: | |
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335 | Py_XDECREF(n_obj); | |
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336 | Py_XDECREF(node_id); | |
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337 | Py_XDECREF(entry); | |
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338 | Py_XDECREF(nullrev_obj); | |
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339 | Py_XDECREF(nullid_obj); | |
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340 | return 0; | |
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341 | } | |
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342 | ||
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343 | ||
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344 | ||
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345 | /* This function parses a index file and returns a Python tuple of the | |
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346 | * following format: (index, nodemap, cache) | |
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347 | * | |
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348 | * index: a list of tuples containing the RevlogNG records | |
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349 | * nodemap: a dict mapping node ids to indices in the index list | |
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350 | * cache: if data is inlined, a tuple (index_file_content, 0) else None | |
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351 | */ | |
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352 | static PyObject *parse_index(PyObject *self, PyObject *args) | |
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353 | { | |
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354 | const char *data; | |
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355 | int size, inlined; | |
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356 | PyObject *rval = NULL, *index = NULL, *nodemap = NULL, *cache = NULL; | |
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357 | PyObject *data_obj = NULL, *inlined_obj; | |
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358 | ||
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359 | if (!PyArg_ParseTuple(args, "s#O", &data, &size, &inlined_obj)) | |
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360 | return NULL; | |
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361 | inlined = inlined_obj && PyObject_IsTrue(inlined_obj); | |
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362 | ||
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363 | /* If no data is inlined, we know the size of the index list in | |
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364 | * advance: size divided by size of one one revlog record (64 bytes) | |
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365 | * plus one for the nullid */ | |
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366 | index = inlined ? PyList_New(0) : PyList_New(size / 64 + 1); | |
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367 | if (!index) | |
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368 | goto quit; | |
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369 | ||
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370 | nodemap = PyDict_New(); | |
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371 | ||
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372 | /* set up the cache return value */ | |
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373 | if (inlined) { | |
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374 | /* Note that the reference to data_obj is only borrowed */ | |
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375 | data_obj = PyTuple_GET_ITEM(args, 0); | |
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376 | cache = Py_BuildValue("iO", 0, data_obj); | |
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377 | if (!cache) | |
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378 | goto quit; | |
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379 | } else { | |
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380 | cache = Py_None; | |
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381 | Py_INCREF(Py_None); | |
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382 | } | |
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383 | ||
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384 | /* actually populate the index and the nodemap with data */ | |
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385 | if (!_parse_index_ng (data, size, inlined, index, nodemap)) | |
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386 | goto quit; | |
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387 | ||
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388 | rval = Py_BuildValue("NNN", index, nodemap, cache); | |
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389 | if (!rval) | |
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390 | goto quit; | |
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391 | return rval; | |
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392 | ||
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393 | quit: | |
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394 | Py_XDECREF(index); | |
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395 | Py_XDECREF(nodemap); | |
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396 | Py_XDECREF(cache); | |
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397 | Py_XDECREF(rval); | |
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398 | Py_XDECREF(data_obj); | |
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399 | return NULL; | |
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400 | } | |
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401 | ||
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402 | ||
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237 | 403 | static char parsers_doc[] = "Efficient content parsing."; |
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238 | 404 | |
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239 | 405 | static PyMethodDef methods[] = { |
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240 | 406 | {"parse_manifest", parse_manifest, METH_VARARGS, "parse a manifest\n"}, |
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241 | 407 | {"parse_dirstate", parse_dirstate, METH_VARARGS, "parse a dirstate\n"}, |
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408 | {"parse_index", parse_index, METH_VARARGS, "parse a revlog index\n"}, | |
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242 | 409 | {NULL, NULL} |
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243 | 410 | }; |
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244 | 411 | |
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245 | 412 | PyMODINIT_FUNC initparsers(void) |
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246 | 413 | { |
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247 | 414 | Py_InitModule3("parsers", methods, parsers_doc); |
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248 | 415 | } |
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