Botan 2.19.2
Crypto and TLS for C&
filter.cpp
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1/*
2* Filter
3* (C) 1999-2007 Jack Lloyd
4*
5* Botan is released under the Simplified BSD License (see license.txt)
6*/
7
8#include <botan/filter.h>
9#include <botan/exceptn.h>
10
11namespace Botan {
12
13/*
14* Filter Constructor
15*/
17 {
18 m_next.resize(1);
19 m_port_num = 0;
20 m_filter_owns = 0;
21 m_owned = false;
22 }
23
24/*
25* Send data to all ports
26*/
27void Filter::send(const uint8_t input[], size_t length)
28 {
29 if(!length)
30 return;
31
32 bool nothing_attached = true;
33 for(size_t j = 0; j != total_ports(); ++j)
34 if(m_next[j])
35 {
36 if(m_write_queue.size())
37 m_next[j]->write(m_write_queue.data(), m_write_queue.size());
38 m_next[j]->write(input, length);
39 nothing_attached = false;
40 }
41
42 if(nothing_attached)
43 m_write_queue += std::make_pair(input, length);
44 else
45 m_write_queue.clear();
46 }
47
48/*
49* Start a new message
50*/
51void Filter::new_msg()
52 {
53 start_msg();
54 for(size_t j = 0; j != total_ports(); ++j)
55 if(m_next[j])
56 m_next[j]->new_msg();
57 }
58
59/*
60* End the current message
61*/
62void Filter::finish_msg()
63 {
64 end_msg();
65 for(size_t j = 0; j != total_ports(); ++j)
66 if(m_next[j])
67 m_next[j]->finish_msg();
68 }
69
70/*
71* Attach a filter to the current port
72*/
73void Filter::attach(Filter* new_filter)
74 {
75 if(new_filter)
76 {
77 Filter* last = this;
78 while(last->get_next())
79 last = last->get_next();
80 last->m_next[last->current_port()] = new_filter;
81 }
82 }
83
84/*
85* Set the active port on a filter
86*/
87void Filter::set_port(size_t new_port)
88 {
89 if(new_port >= total_ports())
90 throw Invalid_Argument("Filter: Invalid port number");
91 m_port_num = new_port;
92 }
93
94/*
95* Return the next Filter in the logical chain
96*/
97Filter* Filter::get_next() const
98 {
99 if(m_port_num < m_next.size())
100 return m_next[m_port_num];
101 return nullptr;
102 }
103
104/*
105* Set the next Filters
106*/
107void Filter::set_next(Filter* filters[], size_t size)
108 {
109 m_next.clear();
110
111 m_port_num = 0;
112 m_filter_owns = 0;
113
114 while(size && filters && (filters[size-1] == nullptr))
115 --size;
116
117 if(filters && size)
118 m_next.assign(filters, filters + size);
119 }
120
121/*
122* Return the total number of ports
123*/
124size_t Filter::total_ports() const
125 {
126 return m_next.size();
127 }
128
129}
virtual void send(const uint8_t in[], size_t length)
Definition: filter.cpp:27
virtual void end_msg()
Definition: filter.h:46
virtual void write(const uint8_t input[], size_t length)=0
virtual void start_msg()
Definition: filter.h:40
Definition: alg_id.cpp:13