Mercurial > dropbear
annotate circbuffer.c @ 855:04ede40a529a
- Some fixes for old compilers like tru64 v4 from Daniel Richard G.
- Don't warn about blocking random device for prngd
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 14 Nov 2013 21:36:45 +0800 |
parents | abd99ecd7ec2 |
children | c71df09bc610 |
rev | line source |
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002-2004 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 #include "includes.h" |
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26 #include "dbutil.h" |
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27 #include "circbuffer.h" |
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28 |
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29 #define MAX_CBUF_SIZE 100000000 |
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30 |
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31 circbuffer * cbuf_new(unsigned int size) { |
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32 |
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33 circbuffer *cbuf = NULL; |
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34 |
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35 if (size > MAX_CBUF_SIZE) { |
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36 dropbear_exit("Bad cbuf size"); |
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37 } |
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38 |
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39 cbuf = (circbuffer*)m_malloc(sizeof(circbuffer)); |
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40 if (size > 0) { |
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41 cbuf->data = (unsigned char*)m_malloc(size); |
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42 } |
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43 cbuf->used = 0; |
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44 cbuf->readpos = 0; |
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45 cbuf->writepos = 0; |
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46 cbuf->size = size; |
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47 |
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48 return cbuf; |
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49 } |
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50 |
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51 void cbuf_free(circbuffer * cbuf) { |
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52 |
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53 m_burn(cbuf->data, cbuf->size); |
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54 m_free(cbuf->data); |
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55 m_free(cbuf); |
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56 } |
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57 |
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58 unsigned int cbuf_getused(circbuffer * cbuf) { |
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59 |
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60 return cbuf->used; |
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61 |
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62 } |
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63 |
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64 unsigned int cbuf_getavail(circbuffer * cbuf) { |
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65 |
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66 return cbuf->size - cbuf->used; |
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67 |
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68 } |
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69 |
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70 unsigned int cbuf_readlen(circbuffer *cbuf) { |
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71 |
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72 dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size); |
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73 dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size); |
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74 |
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75 if (cbuf->used == 0) { |
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76 TRACE(("cbuf_readlen: unused buffer")) |
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77 return 0; |
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78 } |
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79 |
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80 if (cbuf->readpos < cbuf->writepos) { |
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81 return cbuf->writepos - cbuf->readpos; |
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82 } |
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83 |
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84 return cbuf->size - cbuf->readpos; |
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85 } |
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86 |
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87 unsigned int cbuf_writelen(circbuffer *cbuf) { |
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88 |
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89 dropbear_assert(cbuf->used <= cbuf->size); |
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90 dropbear_assert(((2*cbuf->size)+cbuf->writepos-cbuf->readpos)%cbuf->size == cbuf->used%cbuf->size); |
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91 dropbear_assert(((2*cbuf->size)+cbuf->readpos-cbuf->writepos)%cbuf->size == (cbuf->size-cbuf->used)%cbuf->size); |
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92 |
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93 if (cbuf->used == cbuf->size) { |
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94 TRACE(("cbuf_writelen: full buffer")) |
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95 return 0; /* full */ |
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96 } |
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97 |
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98 if (cbuf->writepos < cbuf->readpos) { |
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99 return cbuf->readpos - cbuf->writepos; |
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100 } |
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101 |
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102 return cbuf->size - cbuf->writepos; |
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103 } |
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104 |
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105 unsigned char* cbuf_readptr(circbuffer *cbuf, unsigned int len) { |
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106 if (len > cbuf_readlen(cbuf)) { |
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107 dropbear_exit("Bad cbuf read"); |
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108 } |
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109 |
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110 return &cbuf->data[cbuf->readpos]; |
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111 } |
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112 |
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113 unsigned char* cbuf_writeptr(circbuffer *cbuf, unsigned int len) { |
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114 |
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115 if (len > cbuf_writelen(cbuf)) { |
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116 dropbear_exit("Bad cbuf write"); |
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117 } |
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118 |
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119 return &cbuf->data[cbuf->writepos]; |
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120 } |
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121 |
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122 void cbuf_incrwrite(circbuffer *cbuf, unsigned int len) { |
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123 if (len > cbuf_writelen(cbuf)) { |
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124 dropbear_exit("Bad cbuf write"); |
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125 } |
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126 |
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127 cbuf->used += len; |
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128 dropbear_assert(cbuf->used <= cbuf->size); |
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129 cbuf->writepos = (cbuf->writepos + len) % cbuf->size; |
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130 } |
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131 |
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132 |
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133 void cbuf_incrread(circbuffer *cbuf, unsigned int len) { |
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134 if (len > cbuf_readlen(cbuf)) { |
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135 dropbear_exit("Bad cbuf read"); |
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136 } |
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137 |
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138 dropbear_assert(cbuf->used >= len); |
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139 cbuf->used -= len; |
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140 cbuf->readpos = (cbuf->readpos + len) % cbuf->size; |
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141 } |