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annotate mercurial/base85.c @ 26390:0f0cda81e9b0
gitweb: provide links to branches, tags and bookmarks by name
This is adapted from cd842821db2c, that was added to paper for 3.5 release.
It adds another way to refer to branches, tags and bookmarks in urls: by name.
It's still possible to navigate to a specific changeset hash, but now you can
get more descriptive urls straight from /summary page, for example.
branchentry template (and so the whole branches table on /summary and
/branches) lost the column that had a plain changeset hash, because tags and
bookmarks don't have this column and also because there is already a way to
address branch by its changeset hash (changeset link just next to it). Maybe we
can instead bring this column with a plain changeset hash to tags and
bookmarks, but this, more terse, new look feels fine.
author | Anton Shestakov <av6@dwimlabs.net> |
---|---|
date | Sat, 26 Sep 2015 17:15:58 +0800 |
parents | c1aefe57cf4e |
children | 4613a89bea42 |
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 | |
21 static void | |
22 b85prep(void) | |
23 { | |
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24 unsigned i; |
3283 | 25 |
26 memset(b85dec, 0, sizeof(b85dec)); | |
27 for (i = 0; i < sizeof(b85chars); i++) | |
28 b85dec[(int)(b85chars[i])] = i + 1; | |
29 } | |
30 | |
31 static PyObject * | |
32 b85encode(PyObject *self, PyObject *args) | |
33 { | |
34 const unsigned char *text; | |
35 PyObject *out; | |
36 char *dst; | |
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37 Py_ssize_t len, olen, i; |
3283 | 38 unsigned int acc, val, ch; |
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39 int pad = 0; |
3283 | 40 |
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41 if (!PyArg_ParseTuple(args, "s#|i", &text, &len, &pad)) |
3283 | 42 return NULL; |
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))) |
3283 | 53 return NULL; |
54 | |
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55 dst = PyBytes_AsString(out); |
3283 | 56 |
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57 while (len) { |
3283 | 58 acc = 0; |
59 for (i = 24; i >= 0; i -= 8) { | |
60 ch = *text++; | |
61 acc |= ch << i; | |
62 if (--len == 0) | |
63 break; | |
64 } | |
65 for (i = 4; i >= 0; i--) { | |
66 val = acc % 85; | |
67 acc /= 85; | |
68 dst[i] = b85chars[val]; | |
69 } | |
70 dst += 5; | |
71 } | |
72 | |
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73 if (!pad) |
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74 _PyBytes_Resize(&out, olen); |
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75 |
3283 | 76 return out; |
77 } | |
78 | |
79 static PyObject * | |
80 b85decode(PyObject *self, PyObject *args) | |
81 { | |
82 PyObject *out; | |
83 const char *text; | |
84 char *dst; | |
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85 Py_ssize_t len, i, j, olen, cap; |
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86 int c; |
3283 | 87 unsigned int acc; |
88 | |
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89 if (!PyArg_ParseTuple(args, "s#", &text, &len)) |
3283 | 90 return NULL; |
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))) |
3283 | 97 return NULL; |
98 | |
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99 dst = PyBytes_AsString(out); |
3283 | 100 |
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101 i = 0; |
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102 while (i < len) |
3283 | 103 { |
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++) |
3283 | 109 { |
110 c = b85dec[(int)*text++] - 1; | |
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); |
3283 | 116 acc = acc * 85 + c; |
117 } | |
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118 if (i++ < len) |
3283 | 119 { |
120 c = b85dec[(int)*text++] - 1; | |
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; |
3283 | 134 } |
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++) |
3283 | 143 { |
144 acc = (acc << 8) | (acc >> 24); | |
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145 *dst++ = acc; |
3283 | 146 } |
147 } | |
148 | |
149 return out; | |
150 } | |
151 | |
152 static char base85_doc[] = "Base85 Data Encoding"; | |
153 | |
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"}, |
3283 | 160 {NULL, NULL} |
161 }; | |
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 |
3283 | 179 PyMODINIT_FUNC initbase85(void) |
180 { | |
181 Py_InitModule3("base85", methods, base85_doc); | |
182 | |
183 b85prep(); | |
184 } | |
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185 #endif |