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annotate mercurial/base85.c @ 16378:c463f46fe050
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author | Matt Mackall <mpm@selenic.com> |
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date | Sun, 08 Apr 2012 12:38:10 -0500 |
parents | a4e0908ce35b |
children | a8065323c003 |
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 | |
12 #include <Python.h> | |
13 | |
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14 #include "util.h" |
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15 |
3283 | 16 static const char b85chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
17 "abcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~"; | |
18 static char b85dec[256]; | |
19 | |
20 static void | |
21 b85prep(void) | |
22 { | |
23 int i; | |
24 | |
25 memset(b85dec, 0, sizeof(b85dec)); | |
26 for (i = 0; i < sizeof(b85chars); i++) | |
27 b85dec[(int)(b85chars[i])] = i + 1; | |
28 } | |
29 | |
30 static PyObject * | |
31 b85encode(PyObject *self, PyObject *args) | |
32 { | |
33 const unsigned char *text; | |
34 PyObject *out; | |
35 char *dst; | |
36 int len, olen, i; | |
37 unsigned int acc, val, ch; | |
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38 int pad = 0; |
3283 | 39 |
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40 if (!PyArg_ParseTuple(args, "s#|i", &text, &len, &pad)) |
3283 | 41 return NULL; |
42 | |
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43 if (pad) |
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44 olen = ((len + 3) / 4 * 5) - 3; |
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45 else { |
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46 olen = len % 4; |
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47 if (olen) |
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48 olen++; |
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49 olen += len / 4 * 5; |
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50 } |
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51 if (!(out = PyBytes_FromStringAndSize(NULL, olen + 3))) |
3283 | 52 return NULL; |
53 | |
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54 dst = PyBytes_AsString(out); |
3283 | 55 |
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56 while (len) { |
3283 | 57 acc = 0; |
58 for (i = 24; i >= 0; i -= 8) { | |
59 ch = *text++; | |
60 acc |= ch << i; | |
61 if (--len == 0) | |
62 break; | |
63 } | |
64 for (i = 4; i >= 0; i--) { | |
65 val = acc % 85; | |
66 acc /= 85; | |
67 dst[i] = b85chars[val]; | |
68 } | |
69 dst += 5; | |
70 } | |
71 | |
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72 if (!pad) |
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73 _PyBytes_Resize(&out, olen); |
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74 |
3283 | 75 return out; |
76 } | |
77 | |
78 static PyObject * | |
79 b85decode(PyObject *self, PyObject *args) | |
80 { | |
81 PyObject *out; | |
82 const char *text; | |
83 char *dst; | |
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84 int len, i, j, olen, c, cap; |
3283 | 85 unsigned int acc; |
86 | |
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87 if (!PyArg_ParseTuple(args, "s#", &text, &len)) |
3283 | 88 return NULL; |
89 | |
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90 olen = len / 5 * 4; |
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91 i = len % 5; |
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92 if (i) |
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93 olen += i - 1; |
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94 if (!(out = PyBytes_FromStringAndSize(NULL, olen))) |
3283 | 95 return NULL; |
96 | |
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97 dst = PyBytes_AsString(out); |
3283 | 98 |
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99 i = 0; |
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100 while (i < len) |
3283 | 101 { |
102 acc = 0; | |
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103 cap = len - i - 1; |
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104 if (cap > 4) |
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105 cap = 4; |
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106 for (j = 0; j < cap; i++, j++) |
3283 | 107 { |
108 c = b85dec[(int)*text++] - 1; | |
109 if (c < 0) | |
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110 return PyErr_Format( |
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111 PyExc_ValueError, |
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112 "Bad base85 character at position %d", 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", i); |
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122 /* overflow detection: 0xffffffff == "|NsC0", |
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123 * "|NsC" == 0x03030303 */ |
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124 if (acc > 0x03030303 || (acc *= 85) > 0xffffffff - c) |
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125 return PyErr_Format( |
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126 PyExc_ValueError, |
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127 "Bad base85 sequence at position %d", i); |
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128 acc += c; |
3283 | 129 } |
130 | |
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131 cap = olen < 4 ? olen : 4; |
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132 olen -= cap; |
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133 for (j = 0; j < 4 - cap; j++) |
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134 acc *= 85; |
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135 if (cap && cap < 4) |
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136 acc += 0xffffff >> (cap - 1) * 8; |
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137 for (j = 0; j < cap; j++) |
3283 | 138 { |
139 acc = (acc << 8) | (acc >> 24); | |
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140 *dst++ = acc; |
3283 | 141 } |
142 } | |
143 | |
144 return out; | |
145 } | |
146 | |
147 static char base85_doc[] = "Base85 Data Encoding"; | |
148 | |
149 static PyMethodDef methods[] = { | |
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150 {"b85encode", b85encode, METH_VARARGS, |
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151 "Encode text in base85.\n\n" |
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152 "If the second parameter is true, pad the result to a multiple of " |
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153 "five characters.\n"}, |
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154 {"b85decode", b85decode, METH_VARARGS, "Decode base85 text.\n"}, |
3283 | 155 {NULL, NULL} |
156 }; | |
157 | |
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158 #ifdef IS_PY3K |
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159 static struct PyModuleDef base85_module = { |
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160 PyModuleDef_HEAD_INIT, |
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161 "base85", |
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162 base85_doc, |
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163 -1, |
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164 methods |
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165 }; |
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166 |
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167 PyMODINIT_FUNC PyInit_base85(void) |
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168 { |
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169 b85prep(); |
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170 |
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171 return PyModule_Create(&base85_module); |
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172 } |
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173 #else |
3283 | 174 PyMODINIT_FUNC initbase85(void) |
175 { | |
176 Py_InitModule3("base85", methods, base85_doc); | |
177 | |
178 b85prep(); | |
179 } | |
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180 #endif |