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5b1830f3 MW |
1 | ### -*-pyrex-*- |
2 | ### | |
3 | ### Packet buffering | |
4 | ### | |
5 | ### (c) 2005 Straylight/Edgeware | |
6 | ### | |
579d0169 | 7 | |
5b1830f3 MW |
8 | ###----- Licensing notice --------------------------------------------------- |
9 | ### | |
10 | ### This file is part of the Python interface to mLib. | |
11 | ### | |
12 | ### mLib/Python is free software; you can redistribute it and/or modify | |
13 | ### it under the terms of the GNU General Public License as published by | |
14 | ### the Free Software Foundation; either version 2 of the License, or | |
15 | ### (at your option) any later version. | |
16 | ### | |
17 | ### mLib/Python is distributed in the hope that it will be useful, | |
18 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ### GNU General Public License for more details. | |
21 | ### | |
22 | ### You should have received a copy of the GNU General Public License | |
23 | ### along with mLib/Python; if not, write to the Free Software Foundation, | |
24 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
579d0169 | 25 | |
26 | cdef class PacketBuffer: | |
27 | cdef pkbuf pk | |
28 | cdef _packet | |
29 | cdef _eof | |
376ad06d | 30 | def __cinit__(me, packetproc = None, eofproc = None, *hunoz, **hukairz): |
579d0169 | 31 | pkbuf_init(&me.pk, _pkfunc, <void *>me) |
32 | me._packet = _checkcallable(packetproc, 'packet proc') | |
33 | me._eof = _checkcallable(eofproc, 'eof proc') | |
34 | def __dealloc__(me): | |
35 | pkbuf_destroy(&me.pk) | |
36 | property activep: | |
37 | def __get__(me): | |
38 | return _tobool(me.pk.f & PKBUF_ENABLE) | |
39 | property want: | |
40 | def __get__(me): | |
41 | return me.pk.want | |
42 | def __set__(me, want): | |
43 | if want <= 0: | |
44 | raise TypeError, 'want must be positive' | |
45 | pkbuf_want(&me.pk, pk) | |
46 | property packetproc: | |
47 | def __get__(me): | |
48 | return me._packet | |
49 | def __set__(me, proc): | |
50 | me._line = _checkcallable(proc, 'packet proc') | |
51 | def __del__(me): | |
52 | me._line = None | |
53 | property eofproc: | |
54 | def __get__(me): | |
55 | return me._eof | |
56 | def __set__(me, proc): | |
57 | me._eof = _checkcallable(proc, 'eof proc') | |
58 | def __del__(me): | |
59 | me._eof = None | |
60 | def enable(me): | |
61 | if me.pk.f & PKBUF_ENABLE: | |
62 | raise ValueError, 'already enabled' | |
63 | me.pk.f = me.pk.f | PKBUF_ENABLE | |
64 | me.enabled() | |
65 | return me | |
66 | def disable(me): | |
67 | if not (me.pk.f & PKBUF_ENABLE): | |
68 | raise ValueError, 'already disabled' | |
69 | me.pk.f = me.pk.f & ~PKBUF_ENABLE | |
70 | me.disabled() | |
71 | return me | |
72 | def close(me): | |
73 | if not (me.pk.f & PKBUF_ENABLE): | |
74 | raise ValueError, 'buffer disabled' | |
75 | pkbuf_close(&me.pk) | |
76 | return me | |
77 | property free: | |
78 | def __get__(me): | |
79 | cdef unsigned char *p | |
80 | return pkbuf_free(&me.pk, &p) | |
81 | def flush(me, str): | |
78911cdb | 82 | cdef Py_ssize_t len |
579d0169 | 83 | cdef unsigned char *p |
84 | cdef unsigned char *q | |
85 | cdef size_t n | |
704500e1 | 86 | PyObject_AsReadBuffer(str, <cvp *>&p, &len) |
579d0169 | 87 | while len > 0: |
88 | n = pkbuf_free(&me.pk, &q) | |
89 | if n > len: | |
90 | n = len | |
91 | memcpy(q, p, n) | |
92 | p = p + n | |
93 | len = len - n | |
94 | if not (me.pk.f & PKBUF_ENABLE): | |
95 | break | |
96 | pkbuf_flush(&me.pk, q, n) | |
97 | return PyString_FromStringAndSize(<char *>p, len) | |
98 | def enabled(me): | |
99 | pass | |
100 | def disabled(me): | |
101 | pass | |
102 | def packet(me, pk): | |
103 | return _maybecall(me._packet, (pk,)) | |
104 | def eof(me): | |
105 | return _maybecall(me._eof, ()) | |
106 | ||
107 | cdef void _pkfunc(unsigned char *p, size_t n, pkbuf *pk, | |
108 | size_t *keep, void *arg): | |
109 | cdef PacketBuffer pb | |
110 | cdef void *rp | |
78911cdb | 111 | cdef Py_ssize_t rn |
579d0169 | 112 | pb = <PacketBuffer>arg |
113 | if p is NULL: | |
114 | pb.eof() | |
115 | else: | |
116 | r = pb.packet(PyString_FromStringAndSize(<char *>p, n)) | |
117 | if r is not None: | |
704500e1 | 118 | PyObject_AsReadBuffer(r, <cvp *>&rp, &rn) |
579d0169 | 119 | if rn > n: |
120 | raise ValueError, 'remaining buffer too large' | |
121 | if rn: | |
122 | memcpy(p + n - rn, rp, rn) | |
123 | keep[0] = rn | |
124 | ||
5b1830f3 | 125 | ###----- That's all, folks -------------------------------------------------- |