annotate mercurial/base85.c @ 25563:69e8384a436c

fancyopts: allow all callable as default parameter value The current fancyopts allows function as default parameter value but not other callables. By supporting other callables, we can have the benefits of e.g., custom __str__ method, which will be printed by 'hg help' as the default value.
author introom <i@introo.me>
date Thu, 11 Jun 2015 08:54:24 -0400
parents 19a915d43a68
children c1aefe57cf4e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 base85 codec
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3
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4 Copyright 2006 Brendan Cully <brendan@kublai.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 Largely based on git's implementation
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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
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15 #include "util.h"
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16
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17 static const char b85chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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18 "abcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~";
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19 static char b85dec[256];
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20
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21 static void
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22 b85prep(void)
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23 {
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24 int i;
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25
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26 memset(b85dec, 0, sizeof(b85dec));
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27 for (i = 0; i < sizeof(b85chars); i++)
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28 b85dec[(int)(b85chars[i])] = i + 1;
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29 }
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30
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31 static PyObject *
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32 b85encode(PyObject *self, PyObject *args)
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33 {
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34 const unsigned char *text;
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35 PyObject *out;
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36 char *dst;
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37 Py_ssize_t len, olen, i;
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38 unsigned int acc, val, ch;
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39 int pad = 0;
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40
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41 if (!PyArg_ParseTuple(args, "s#|i", &text, &len, &pad))
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42 return NULL;
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43
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44 if (pad)
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45 olen = ((len + 3) / 4 * 5) - 3;
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46 else {
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47 olen = len % 4;
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48 if (olen)
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49 olen++;
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50 olen += len / 4 * 5;
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51 }
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52 if (!(out = PyBytes_FromStringAndSize(NULL, olen + 3)))
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53 return NULL;
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54
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55 dst = PyBytes_AsString(out);
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56
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57 while (len) {
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58 acc = 0;
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59 for (i = 24; i >= 0; i -= 8) {
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60 ch = *text++;
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61 acc |= ch << i;
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62 if (--len == 0)
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63 break;
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64 }
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65 for (i = 4; i >= 0; i--) {
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66 val = acc % 85;
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67 acc /= 85;
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68 dst[i] = b85chars[val];
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69 }
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70 dst += 5;
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71 }
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72
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73 if (!pad)
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74 _PyBytes_Resize(&out, olen);
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75
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76 return out;
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77 }
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78
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79 static PyObject *
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80 b85decode(PyObject *self, PyObject *args)
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81 {
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82 PyObject *out;
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83 const char *text;
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84 char *dst;
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85 Py_ssize_t len, i, j, olen, cap;
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86 int c;
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87 unsigned int acc;
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88
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89 if (!PyArg_ParseTuple(args, "s#", &text, &len))
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90 return NULL;
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91
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92 olen = len / 5 * 4;
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93 i = len % 5;
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94 if (i)
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95 olen += i - 1;
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96 if (!(out = PyBytes_FromStringAndSize(NULL, olen)))
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97 return NULL;
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98
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99 dst = PyBytes_AsString(out);
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100
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101 i = 0;
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102 while (i < len)
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103 {
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104 acc = 0;
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105 cap = len - i - 1;
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106 if (cap > 4)
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107 cap = 4;
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108 for (j = 0; j < cap; i++, j++)
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109 {
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110 c = b85dec[(int)*text++] - 1;
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111 if (c < 0)
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112 return PyErr_Format(
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113 PyExc_ValueError,
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114 "bad base85 character at position %d",
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115 (int)i);
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116 acc = acc * 85 + c;
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117 }
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118 if (i++ < len)
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119 {
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120 c = b85dec[(int)*text++] - 1;
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121 if (c < 0)
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122 return PyErr_Format(
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123 PyExc_ValueError,
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124 "bad base85 character at position %d",
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125 (int)i);
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126 /* overflow detection: 0xffffffff == "|NsC0",
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127 * "|NsC" == 0x03030303 */
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128 if (acc > 0x03030303 || (acc *= 85) > 0xffffffff - c)
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129 return PyErr_Format(
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130 PyExc_ValueError,
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131 "bad base85 sequence at position %d",
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132 (int)i);
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133 acc += c;
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134 }
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135
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136 cap = olen < 4 ? olen : 4;
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137 olen -= cap;
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138 for (j = 0; j < 4 - cap; j++)
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139 acc *= 85;
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140 if (cap && cap < 4)
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141 acc += 0xffffff >> (cap - 1) * 8;
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142 for (j = 0; j < cap; j++)
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143 {
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144 acc = (acc << 8) | (acc >> 24);
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145 *dst++ = acc;
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146 }
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147 }
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148
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149 return out;
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150 }
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151
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152 static char base85_doc[] = "Base85 Data Encoding";
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153
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154 static PyMethodDef methods[] = {
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155 {"b85encode", b85encode, METH_VARARGS,
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156 "Encode text in base85.\n\n"
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157 "If the second parameter is true, pad the result to a multiple of "
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158 "five characters.\n"},
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159 {"b85decode", b85decode, METH_VARARGS, "Decode base85 text.\n"},
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160 {NULL, NULL}
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161 };
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162
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163 #ifdef IS_PY3K
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164 static struct PyModuleDef base85_module = {
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165 PyModuleDef_HEAD_INIT,
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166 "base85",
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167 base85_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_base85(void)
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173 {
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174 b85prep();
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175
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176 return PyModule_Create(&base85_module);
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177 }
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178 #else
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179 PyMODINIT_FUNC initbase85(void)
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180 {
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181 Py_InitModule3("base85", methods, base85_doc);
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182
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183 b85prep();
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184 }
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185 #endif