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annotate mercurial/base85.c @ 16837:1b9d54c00d50

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base85: use Py_ssize_t for string lengths
author Adrian Buehlmann <adrian@cadifra.com>
date Thu, 24 May 2012 01:30:12 +0200
parents a8065323c003
children 19a915d43a68
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rev   line source
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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", i);
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115 acc = acc * 85 + c;
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116 }
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117 if (i++ < len)
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118 {
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119 c = b85dec[(int)*text++] - 1;
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120 if (c < 0)
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121 return PyErr_Format(
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122 PyExc_ValueError,
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123 "bad base85 character at position %d", i);
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124 /* overflow detection: 0xffffffff == "|NsC0",
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125 * "|NsC" == 0x03030303 */
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126 if (acc > 0x03030303 || (acc *= 85) > 0xffffffff - c)
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127 return PyErr_Format(
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128 PyExc_ValueError,
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129 "bad base85 sequence at position %d", i);
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130 acc += c;
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131 }
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132
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133 cap = olen < 4 ? olen : 4;
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134 olen -= cap;
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135 for (j = 0; j < 4 - cap; j++)
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136 acc *= 85;
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137 if (cap && cap < 4)
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138 acc += 0xffffff >> (cap - 1) * 8;
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139 for (j = 0; j < cap; j++)
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140 {
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141 acc = (acc << 8) | (acc >> 24);
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142 *dst++ = acc;
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143 }
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144 }
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145
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146 return out;
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147 }
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148
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149 static char base85_doc[] = "Base85 Data Encoding";
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150
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151 static PyMethodDef methods[] = {
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152 {"b85encode", b85encode, METH_VARARGS,
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153 "Encode text in base85.\n\n"
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154 "If the second parameter is true, pad the result to a multiple of "
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155 "five characters.\n"},
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156 {"b85decode", b85decode, METH_VARARGS, "Decode base85 text.\n"},
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157 {NULL, NULL}
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158 };
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159
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160 #ifdef IS_PY3K
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161 static struct PyModuleDef base85_module = {
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162 PyModuleDef_HEAD_INIT,
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163 "base85",
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164 base85_doc,
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165 -1,
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166 methods
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167 };
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168
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169 PyMODINIT_FUNC PyInit_base85(void)
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170 {
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171 b85prep();
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172
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173 return PyModule_Create(&base85_module);
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174 }
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175 #else
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176 PyMODINIT_FUNC initbase85(void)
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177 {
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178 Py_InitModule3("base85", methods, base85_doc);
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179
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180 b85prep();
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181 }
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182 #endif