Mercurial > hg
annotate mercurial/base85.c @ 28238:b57d45ec33b2
test: update test-bundle2-format.t comment
Now that bundle2 is used by default for all exchanges, this comment is obviously
out of date. Having deep testing of the API and expected behavior of the format
and its processing is still valuable, so the comment is updated.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Thu, 25 Feb 2016 10:34:31 +0100 |
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 |