Mercurial > hg
annotate mercurial/base85.c @ 32129:f0ea0f642627
py3: make posix.getuser return a bytes
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Fri, 21 Apr 2017 00:53:38 +0530 |
parents | 4613a89bea42 |
children | 7948adb53e28 |
rev | line source |
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3283 | 1 /* |
2 base85 codec | |
3 | |
4 Copyright 2006 Brendan Cully <brendan@kublai.com> | |
5 | |
6 This software may be used and distributed according to the terms of | |
7 the GNU General Public License, incorporated herein by reference. | |
8 | |
9 Largely based on git's implementation | |
10 */ | |
11 | |
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12 #define PY_SSIZE_T_CLEAN |
3283 | 13 #include <Python.h> |
14 | |
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15 #include "util.h" |
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16 |
3283 | 17 static const char b85chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
18 "abcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~"; | |
19 static char b85dec[256]; | |
20 | |
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21 static void b85prep(void) |
3283 | 22 { |
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23 unsigned i; |
3283 | 24 |
25 memset(b85dec, 0, sizeof(b85dec)); | |
26 for (i = 0; i < sizeof(b85chars); i++) | |
27 b85dec[(int)(b85chars[i])] = i + 1; | |
28 } | |
29 | |
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30 static PyObject *b85encode(PyObject *self, PyObject *args) |
3283 | 31 { |
32 const unsigned char *text; | |
33 PyObject *out; | |
34 char *dst; | |
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35 Py_ssize_t len, olen, i; |
3283 | 36 unsigned int acc, val, ch; |
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37 int pad = 0; |
3283 | 38 |
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39 if (!PyArg_ParseTuple(args, "s#|i", &text, &len, &pad)) |
3283 | 40 return NULL; |
41 | |
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42 if (pad) |
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43 olen = ((len + 3) / 4 * 5) - 3; |
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44 else { |
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45 olen = len % 4; |
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46 if (olen) |
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47 olen++; |
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48 olen += len / 4 * 5; |
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49 } |
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50 if (!(out = PyBytes_FromStringAndSize(NULL, olen + 3))) |
3283 | 51 return NULL; |
52 | |
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53 dst = PyBytes_AsString(out); |
3283 | 54 |
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55 while (len) { |
3283 | 56 acc = 0; |
57 for (i = 24; i >= 0; i -= 8) { | |
58 ch = *text++; | |
59 acc |= ch << i; | |
60 if (--len == 0) | |
61 break; | |
62 } | |
63 for (i = 4; i >= 0; i--) { | |
64 val = acc % 85; | |
65 acc /= 85; | |
66 dst[i] = b85chars[val]; | |
67 } | |
68 dst += 5; | |
69 } | |
70 | |
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71 if (!pad) |
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72 _PyBytes_Resize(&out, olen); |
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73 |
3283 | 74 return out; |
75 } | |
76 | |
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77 static PyObject *b85decode(PyObject *self, PyObject *args) |
3283 | 78 { |
79 PyObject *out; | |
80 const char *text; | |
81 char *dst; | |
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82 Py_ssize_t len, i, j, olen, cap; |
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83 int c; |
3283 | 84 unsigned int acc; |
85 | |
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86 if (!PyArg_ParseTuple(args, "s#", &text, &len)) |
3283 | 87 return NULL; |
88 | |
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89 olen = len / 5 * 4; |
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90 i = len % 5; |
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91 if (i) |
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92 olen += i - 1; |
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93 if (!(out = PyBytes_FromStringAndSize(NULL, olen))) |
3283 | 94 return NULL; |
95 | |
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96 dst = PyBytes_AsString(out); |
3283 | 97 |
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98 i = 0; |
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99 while (i < len) |
3283 | 100 { |
101 acc = 0; | |
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102 cap = len - i - 1; |
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103 if (cap > 4) |
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104 cap = 4; |
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105 for (j = 0; j < cap; i++, j++) |
3283 | 106 { |
107 c = b85dec[(int)*text++] - 1; | |
108 if (c < 0) | |
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109 return PyErr_Format( |
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110 PyExc_ValueError, |
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111 "bad base85 character at position %d", |
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112 (int)i); |
3283 | 113 acc = acc * 85 + c; |
114 } | |
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115 if (i++ < len) |
3283 | 116 { |
117 c = b85dec[(int)*text++] - 1; | |
118 if (c < 0) | |
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119 return PyErr_Format( |
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120 PyExc_ValueError, |
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121 "bad base85 character at position %d", |
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122 (int)i); |
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123 /* overflow detection: 0xffffffff == "|NsC0", |
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124 * "|NsC" == 0x03030303 */ |
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125 if (acc > 0x03030303 || (acc *= 85) > 0xffffffff - c) |
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126 return PyErr_Format( |
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127 PyExc_ValueError, |
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128 "bad base85 sequence at position %d", |
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129 (int)i); |
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130 acc += c; |
3283 | 131 } |
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++) |
3283 | 140 { |
141 acc = (acc << 8) | (acc >> 24); | |
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142 *dst++ = acc; |
3283 | 143 } |
144 } | |
145 | |
146 return out; | |
147 } | |
148 | |
149 static char base85_doc[] = "Base85 Data Encoding"; | |
150 | |
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"}, |
3283 | 157 {NULL, NULL} |
158 }; | |
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 |
3283 | 176 PyMODINIT_FUNC initbase85(void) |
177 { | |
178 Py_InitModule3("base85", methods, base85_doc); | |
179 | |
180 b85prep(); | |
181 } | |
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182 #endif |