Mercurial > dropbear

annotate circbuffer.c @ 965:e9579816f20e DROPBEAR_2014.65

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
2014.64
author Matt Johnston <matt@ucc.asn.au>
date Fri, 08 Aug 2014 21:40:42 +0800
parents abd99ecd7ec2
children c71df09bc610
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /*
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 * Dropbear SSH
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 *
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 * Copyright (c) 2002-2004 Matt Johnston
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5 * All rights reserved.
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 *
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 * of this software and associated documentation files (the "Software"), to deal
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * in the Software without restriction, including without limitation the rights
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 * copies of the Software, and to permit persons to whom the Software is
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 * furnished to do so, subject to the following conditions:
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 *
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 * The above copyright notice and this permission notice shall be included in
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 * all copies or substantial portions of the Software.
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 *
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 * SOFTWARE. */
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 #include "includes.h"
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 #include "dbutil.h"
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 #include "circbuffer.h"
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 #define MAX_CBUF_SIZE 100000000
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 circbuffer * cbuf_new(unsigned int size) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 circbuffer *cbuf = NULL;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35 if (size > MAX_CBUF_SIZE) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
36 dropbear_exit("Bad cbuf size");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
39 cbuf = (circbuffer*)m_malloc(sizeof(circbuffer));
709
abd99ecd7ec2 use an empty writebuf rather than a NULL one
Matt Johnston <matt@ucc.asn.au>
parents: 648
diff changeset
40 if (size > 0) {
abd99ecd7ec2 use an empty writebuf rather than a NULL one
Matt Johnston <matt@ucc.asn.au>
parents: 648
diff changeset
41 cbuf->data = (unsigned char*)m_malloc(size);
abd99ecd7ec2 use an empty writebuf rather than a NULL one
Matt Johnston <matt@ucc.asn.au>
parents: 648
diff changeset
42 }
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
43 cbuf->used = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44 cbuf->readpos = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 cbuf->writepos = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46 cbuf->size = size;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48 return cbuf;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
49 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
50
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51 void cbuf_free(circbuffer * cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
52
648
4222a1039b06 Clear a few buffers when possible
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
53 m_burn(cbuf->data, cbuf->size);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
54 m_free(cbuf->data);
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 m_free(cbuf);
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
58 unsigned int cbuf_getused(circbuffer * cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 return cbuf->used;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
63
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
64 unsigned int cbuf_getavail(circbuffer * cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 return cbuf->size - cbuf->used;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 unsigned int cbuf_readlen(circbuffer *cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
72 dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size);
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
73 dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 if (cbuf->used == 0) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
76 TRACE(("cbuf_readlen: unused buffer"))
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 return 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 if (cbuf->readpos < cbuf->writepos) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 return cbuf->writepos - cbuf->readpos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 return cbuf->size - cbuf->readpos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 unsigned int cbuf_writelen(circbuffer *cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
89 dropbear_assert(cbuf->used <= cbuf->size);
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
90 dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size);
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
91 dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 if (cbuf->used == cbuf->size) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 108
diff changeset
94 TRACE(("cbuf_writelen: full buffer"))
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 return 0; /* full */
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 if (cbuf->writepos < cbuf->readpos) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return cbuf->readpos - cbuf->writepos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return cbuf->size - cbuf->writepos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 unsigned char* cbuf_readptr(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 if (len > cbuf_readlen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
107 dropbear_exit("Bad cbuf read");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 return &cbuf->data[cbuf->readpos];
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
113 unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
114
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 if (len > cbuf_writelen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
116 dropbear_exit("Bad cbuf write");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
117 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
118
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 return &cbuf->data[cbuf->writepos];
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 if (len > cbuf_writelen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
124 dropbear_exit("Bad cbuf write");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 cbuf->used += len;
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
128 dropbear_assert(cbuf->used <= cbuf->size);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 cbuf->writepos = (cbuf->writepos + len) % cbuf->size;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133 void cbuf_incrread(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
134 if (len > cbuf_readlen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
135 dropbear_exit("Bad cbuf read");
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
136 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
137
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
138 dropbear_assert(cbuf->used >= len);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
139 cbuf->used -= len;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 cbuf->readpos = (cbuf->readpos + len) % cbuf->size;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141 }