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5b1830f3 MW |
1 | ### -*-pyrex-*- |
2 | ### | |
3 | ### Selecting packet-buffer | |
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 SelPacketBuffer: | |
addc0c37 MW |
27 | """ |
28 | SelPacketBuffer(FILE, [packetproc = None], [eofproc = None]) | |
29 | ||
30 | Split an incoming stream into packets. | |
31 | """ | |
579d0169 | 32 | cdef selpk p |
33 | cdef _packet | |
34 | cdef _eof | |
376ad06d | 35 | def __cinit__(me, fd, packetproc = None, eofproc = None, *hunoz, **hukairz): |
579d0169 | 36 | selpk_init(&me.p, &_sel, _getfd(fd), _selpkfunc, <void *>me) |
37 | selpk_disable(&me.p) | |
38 | me._packet = _checkcallable(packetproc, 'packet proc') | |
39 | me._eof = _checkcallable(eofproc, 'eof proc') | |
40 | def __dealloc__(me): | |
41 | selpk_destroy(&me.p) | |
42 | property activep: | |
addc0c37 | 43 | """SPK.activep -> BOOL: is the buffer still active?""" |
579d0169 | 44 | def __get__(me): |
45 | return _to_bool(me.p.pk.f & PKBUF_ENABLE) | |
46 | property fd: | |
addc0c37 | 47 | """SPK.fd -> INT: the file descriptor""" |
579d0169 | 48 | def __get__(me): |
49 | return me.p.reader.fd | |
50 | property want: | |
addc0c37 | 51 | """SPK.want -> INT: size of next packet to return""" |
579d0169 | 52 | def __get__(me): |
53 | return me.p.pk.want | |
54 | def __set__(me, n): | |
55 | if n <= 0: | |
56 | raise TypeError, 'size must be positive' | |
57 | selpk_want(&me.p, n) | |
bc57ab58 | 58 | property packetproc: |
addc0c37 | 59 | """SPK.packetproc -> FUNC: call FUNC(PACKET) on each packet""" |
579d0169 | 60 | def __get__(me): |
bc57ab58 | 61 | return me._packet |
579d0169 | 62 | def __set__(me, proc): |
bc57ab58 | 63 | me._packet = _checkcallable(proc, 'packet proc') |
579d0169 | 64 | def __del__(me): |
bc57ab58 | 65 | me._packet = None |
579d0169 | 66 | property eofproc: |
addc0c37 | 67 | """SPK.eofproc -> FUNC: call FUNC() at end-of-file""" |
579d0169 | 68 | def __get__(me): |
69 | return me._eof | |
70 | def __set__(me, proc): | |
71 | me._eof = _checkcallable(proc, 'eof proc') | |
72 | def __del__(me): | |
73 | me._eof = None | |
74 | def enable(me): | |
addc0c37 | 75 | """SPK.enable(): enable the buffer, allowing packets to be emitted""" |
579d0169 | 76 | if me.p.pk.f & PKBUF_ENABLE: |
77 | raise ValueError, 'already enabled' | |
78 | selpk_enable(&me.p) | |
79 | me.enabled() | |
80 | return me | |
81 | def disable(me): | |
addc0c37 | 82 | """SPK.disable(): disable the buffer, suspending packet emission""" |
579d0169 | 83 | if not (me.p.pk.f & PKBUF_ENABLE): |
84 | raise ValueError, 'already disabled' | |
85 | selpk_disable(&me.p) | |
86 | me.disabled() | |
87 | return me | |
88 | def enabled(me): | |
addc0c37 | 89 | """SPK.enabled(): called when buffer is enabled""" |
579d0169 | 90 | pass |
91 | def disabled(me): | |
addc0c37 | 92 | """SPK.disabled(): called when buffer is disabled""" |
579d0169 | 93 | pass |
94 | def packet(me, pk): | |
addc0c37 | 95 | """SPK.packet(PACKET): called for each completed packet""" |
579d0169 | 96 | return _maybecall(me._packet, (pk,)) |
97 | def eof(me): | |
addc0c37 | 98 | """SPK.eof(): called at end-of-file""" |
579d0169 | 99 | return _maybecall(me._eof, ()) |
100 | ||
b51b6cf0 MW |
101 | cdef void _selpkfunc(unsigned char *p, size_t n, pkbuf *pk, |
102 | size_t *keep, void *arg): | |
579d0169 | 103 | cdef SelPacketBuffer pb |
104 | cdef void *rp | |
78911cdb | 105 | cdef Py_ssize_t rn |
579d0169 | 106 | pb = <SelPacketBuffer>arg |
107 | if p is NULL: | |
108 | pb.eof() | |
109 | else: | |
110 | r = pb.packet(PyString_FromStringAndSize(<char *>p, n)) | |
111 | if r is not None: | |
704500e1 | 112 | PyObject_AsReadBuffer(r, <cvp *>&rp, &rn) |
579d0169 | 113 | if rn > n: |
114 | raise ValueError, 'remaining buffer too large' | |
115 | if rn: | |
116 | memcpy(p + n - rn, rp, rn) | |
117 | keep[0] = rn | |
118 | ||
5b1830f3 | 119 | ###----- That's all, folks -------------------------------------------------- |