##// END OF EJS Templates
selectors2: backport minimal fix of timeout handling from 2.0.1...
selectors2: backport minimal fix of timeout handling from 2.0.1 The original code would raise TypeError since OSError() doesn't support keyword arguments. We can't simply import the selectors 2.0.1, which still spawns "uname -p" through platform.system(). We could switch to the unreleased version, but I decided to not right now to minimize the change.

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base85.c
191 lines | 3.7 KiB | text/x-c | CLexer
/*
base85 codec
Copyright 2006 Brendan Cully <brendan@kublai.com>
This software may be used and distributed according to the terms of
the GNU General Public License, incorporated herein by reference.
Largely based on git's implementation
*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "util.h"
static const char b85chars[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz!#$%&()*+-;<=>?@^_`{|}~";
static char b85dec[256];
static void b85prep(void)
{
unsigned i;
memset(b85dec, 0, sizeof(b85dec));
for (i = 0; i < sizeof(b85chars); i++)
b85dec[(int)(b85chars[i])] = i + 1;
}
static PyObject *b85encode(PyObject *self, PyObject *args)
{
const unsigned char *text;
PyObject *out;
char *dst;
Py_ssize_t len, olen, i;
unsigned int acc, val, ch;
int pad = 0;
if (!PyArg_ParseTuple(args, PY23("s#|i", "y#|i"), &text, &len, &pad))
return NULL;
if (pad)
olen = ((len + 3) / 4 * 5) - 3;
else {
olen = len % 4;
if (olen)
olen++;
olen += len / 4 * 5;
}
if (!(out = PyBytes_FromStringAndSize(NULL, olen + 3)))
return NULL;
dst = PyBytes_AsString(out);
while (len) {
acc = 0;
for (i = 24; i >= 0; i -= 8) {
ch = *text++;
acc |= ch << i;
if (--len == 0)
break;
}
for (i = 4; i >= 0; i--) {
val = acc % 85;
acc /= 85;
dst[i] = b85chars[val];
}
dst += 5;
}
if (!pad)
_PyBytes_Resize(&out, olen);
return out;
}
static PyObject *b85decode(PyObject *self, PyObject *args)
{
PyObject *out = NULL;
const char *text;
char *dst;
Py_ssize_t len, i, j, olen, cap;
int c;
unsigned int acc;
if (!PyArg_ParseTuple(args, PY23("s#", "y#"), &text, &len))
return NULL;
olen = len / 5 * 4;
i = len % 5;
if (i)
olen += i - 1;
if (!(out = PyBytes_FromStringAndSize(NULL, olen)))
return NULL;
dst = PyBytes_AsString(out);
i = 0;
while (i < len) {
acc = 0;
cap = len - i - 1;
if (cap > 4)
cap = 4;
for (j = 0; j < cap; i++, j++) {
c = b85dec[(int)*text++] - 1;
if (c < 0) {
PyErr_Format(
PyExc_ValueError,
"bad base85 character at position %d",
(int)i);
goto bail;
}
acc = acc * 85 + c;
}
if (i++ < len) {
c = b85dec[(int)*text++] - 1;
if (c < 0) {
PyErr_Format(
PyExc_ValueError,
"bad base85 character at position %d",
(int)i);
goto bail;
}
/* overflow detection: 0xffffffff == "|NsC0",
* "|NsC" == 0x03030303 */
if (acc > 0x03030303 || (acc *= 85) > 0xffffffff - c) {
PyErr_Format(
PyExc_ValueError,
"bad base85 sequence at position %d",
(int)i);
goto bail;
}
acc += c;
}
cap = olen < 4 ? olen : 4;
olen -= cap;
for (j = 0; j < 4 - cap; j++)
acc *= 85;
if (cap && cap < 4)
acc += 0xffffff >> (cap - 1) * 8;
for (j = 0; j < cap; j++) {
acc = (acc << 8) | (acc >> 24);
*dst++ = acc;
}
}
return out;
bail:
Py_XDECREF(out);
return NULL;
}
static char base85_doc[] = "Base85 Data Encoding";
static PyMethodDef methods[] = {
{"b85encode", b85encode, METH_VARARGS,
"Encode text in base85.\n\n"
"If the second parameter is true, pad the result to a multiple of "
"five characters.\n"},
{"b85decode", b85decode, METH_VARARGS, "Decode base85 text.\n"},
{NULL, NULL},
};
static const int version = 1;
#ifdef IS_PY3K
static struct PyModuleDef base85_module = {
PyModuleDef_HEAD_INIT, "base85", base85_doc, -1, methods,
};
PyMODINIT_FUNC PyInit_base85(void)
{
PyObject *m;
b85prep();
m = PyModule_Create(&base85_module);
PyModule_AddIntConstant(m, "version", version);
return m;
}
#else
PyMODINIT_FUNC initbase85(void)
{
PyObject *m;
m = Py_InitModule3("base85", methods, base85_doc);
b85prep();
PyModule_AddIntConstant(m, "version", version);
}
#endif