Mercurial > dropbear

annotate circbuffer.c @ 1672:3a97f14c0235

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents 06d52bcb8094
children
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));
1167
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
40 /* data is malloced on first write */
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
41 cbuf->data = NULL;
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
42 cbuf->used = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
43 cbuf->readpos = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44 cbuf->writepos = 0;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 cbuf->size = size;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47 return cbuf;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48 }
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 void cbuf_free(circbuffer * cbuf) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51
1167
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
52 if (cbuf->data) {
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
53 m_burn(cbuf->data, cbuf->size);
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
54 m_free(cbuf->data);
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
55 }
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 m_free(cbuf);
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
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1167
diff changeset
59 unsigned int cbuf_getused(const circbuffer * cbuf) {
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61 return cbuf->used;
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
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1167
diff changeset
65 unsigned int cbuf_getavail(const circbuffer * cbuf) {
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 return cbuf->size - cbuf->used;
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
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1167
diff changeset
71 unsigned int cbuf_writelen(const circbuffer *cbuf) {
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
73 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
74 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
75 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
76
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 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
78 TRACE(("cbuf_writelen: full buffer"))
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 return 0; /* full */
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 if (cbuf->writepos < cbuf->readpos) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83 return cbuf->readpos - cbuf->writepos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 }
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 return cbuf->size - cbuf->writepos;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
1459
06d52bcb8094 Pointer parameter could be declared as pointing to const
Francois Perrad <francois.perrad@gadz.org>
parents: 1167
diff changeset
89 void cbuf_readptrs(const circbuffer *cbuf,
1054
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
90 unsigned char **p1, unsigned int *len1,
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
91 unsigned char **p2, unsigned int *len2) {
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
92 *p1 = &cbuf->data[cbuf->readpos];
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
93 *len1 = MIN(cbuf->used, cbuf->size - cbuf->readpos);
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
94
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
95 if (*len1 < cbuf->used) {
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
96 *p2 = cbuf->data;
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
97 *len2 = cbuf->used - *len1;
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
98 } else {
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
99 *p2 = NULL;
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
100 *len2 = 0;
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
101 }
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
102 }
c71df09bc610 Avoid copying data into circular buffer
Matt Johnston <matt@ucc.asn.au>
parents: 709
diff changeset
103
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 if (len > cbuf_writelen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
107 dropbear_exit("Bad cbuf write");
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
1167
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
110 if (!cbuf->data) {
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
111 /* lazy allocation */
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
112 cbuf->data = (unsigned char*)m_malloc(cbuf->size);
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
113 }
1397a677cb5c lazy allocation of circbuffer
Matt Johnston <matt@ucc.asn.au>
parents: 1079
diff changeset
114
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 return &cbuf->data[cbuf->writepos];
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
116 }
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 void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) {
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 if (len > cbuf_writelen(cbuf)) {
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 241
diff changeset
120 dropbear_exit("Bad cbuf write");
108
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
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 cbuf->used += len;
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
124 dropbear_assert(cbuf->used <= cbuf->size);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 cbuf->writepos = (cbuf->writepos + len) % cbuf->size;
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
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
128
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 void cbuf_incrread(circbuffer *cbuf, unsigned int len) {
241
c5d3ef11155f * use own assertions which should get logged properly
Matt Johnston <matt@ucc.asn.au>
parents: 165
diff changeset
130 dropbear_assert(cbuf->used >= len);
108
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131 cbuf->used -= len;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
132 cbuf->readpos = (cbuf->readpos + len) % cbuf->size;
10f4d3319780 - added circular buffering for channels
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
133 }