579d0169 |
1 | # -*-pyrex-*- |
2 | # |
3 | # $Id$ |
4 | # |
5 | # Packet buffering |
6 | # |
7 | # (c) 2005 Straylight/Edgeware |
8 | # |
9 | |
10 | #----- Licensing notice ----------------------------------------------------- |
11 | # |
12 | # This file is part of the Python interface to mLib. |
13 | # |
14 | # mLib/Python is free software; you can redistribute it and/or modify |
15 | # it under the terms of the GNU General Public License as published by |
16 | # the Free Software Foundation; either version 2 of the License, or |
17 | # (at your option) any later version. |
18 | # |
19 | # mLib/Python is distributed in the hope that it will be useful, |
20 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | # GNU General Public License for more details. |
23 | # |
24 | # You should have received a copy of the GNU General Public License |
25 | # along with mLib/Python; if not, write to the Free Software Foundation, |
26 | # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | |
28 | cdef class PacketBuffer: |
29 | cdef pkbuf pk |
30 | cdef _packet |
31 | cdef _eof |
32 | def __new__(me, packetproc = None, eofproc = None, *hunoz, **hukairz): |
33 | pkbuf_init(&me.pk, _pkfunc, <void *>me) |
34 | me._packet = _checkcallable(packetproc, 'packet proc') |
35 | me._eof = _checkcallable(eofproc, 'eof proc') |
36 | def __dealloc__(me): |
37 | pkbuf_destroy(&me.pk) |
38 | property activep: |
39 | def __get__(me): |
40 | return _tobool(me.pk.f & PKBUF_ENABLE) |
41 | property want: |
42 | def __get__(me): |
43 | return me.pk.want |
44 | def __set__(me, want): |
45 | if want <= 0: |
46 | raise TypeError, 'want must be positive' |
47 | pkbuf_want(&me.pk, pk) |
48 | property packetproc: |
49 | def __get__(me): |
50 | return me._packet |
51 | def __set__(me, proc): |
52 | me._line = _checkcallable(proc, 'packet proc') |
53 | def __del__(me): |
54 | me._line = None |
55 | property eofproc: |
56 | def __get__(me): |
57 | return me._eof |
58 | def __set__(me, proc): |
59 | me._eof = _checkcallable(proc, 'eof proc') |
60 | def __del__(me): |
61 | me._eof = None |
62 | def enable(me): |
63 | if me.pk.f & PKBUF_ENABLE: |
64 | raise ValueError, 'already enabled' |
65 | me.pk.f = me.pk.f | PKBUF_ENABLE |
66 | me.enabled() |
67 | return me |
68 | def disable(me): |
69 | if not (me.pk.f & PKBUF_ENABLE): |
70 | raise ValueError, 'already disabled' |
71 | me.pk.f = me.pk.f & ~PKBUF_ENABLE |
72 | me.disabled() |
73 | return me |
74 | def close(me): |
75 | if not (me.pk.f & PKBUF_ENABLE): |
76 | raise ValueError, 'buffer disabled' |
77 | pkbuf_close(&me.pk) |
78 | return me |
79 | property free: |
80 | def __get__(me): |
81 | cdef unsigned char *p |
82 | return pkbuf_free(&me.pk, &p) |
83 | def flush(me, str): |
84 | cdef int len |
85 | cdef unsigned char *p |
86 | cdef unsigned char *q |
87 | cdef size_t n |
88 | PyObject_AsReadBuffer(str, <void **>&p, &len) |
89 | while len > 0: |
90 | n = pkbuf_free(&me.pk, &q) |
91 | if n > len: |
92 | n = len |
93 | memcpy(q, p, n) |
94 | p = p + n |
95 | len = len - n |
96 | if not (me.pk.f & PKBUF_ENABLE): |
97 | break |
98 | pkbuf_flush(&me.pk, q, n) |
99 | return PyString_FromStringAndSize(<char *>p, len) |
100 | def enabled(me): |
101 | pass |
102 | def disabled(me): |
103 | pass |
104 | def packet(me, pk): |
105 | return _maybecall(me._packet, (pk,)) |
106 | def eof(me): |
107 | return _maybecall(me._eof, ()) |
108 | |
109 | cdef void _pkfunc(unsigned char *p, size_t n, pkbuf *pk, |
110 | size_t *keep, void *arg): |
111 | cdef PacketBuffer pb |
112 | cdef void *rp |
113 | cdef int rn |
114 | pb = <PacketBuffer>arg |
115 | if p is NULL: |
116 | pb.eof() |
117 | else: |
118 | r = pb.packet(PyString_FromStringAndSize(<char *>p, n)) |
119 | if r is not None: |
120 | PyObject_AsReadBuffer(r, &rp, &rn) |
121 | if rn > n: |
122 | raise ValueError, 'remaining buffer too large' |
123 | if rn: |
124 | memcpy(p + n - rn, rp, rn) |
125 | keep[0] = rn |
126 | |
127 | #----- That's all, folks ---------------------------------------------------- |