1 | //buffer.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2010 |
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5 | * |
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6 | * This file is part of libroar a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroar is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | * NOTE for everyone want's to change something and send patches: |
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25 | * read README and HACKING! There a addition information on |
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26 | * the license of this document you need to read before you send |
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27 | * any patches. |
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28 | * |
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29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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30 | * or libpulse*: |
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31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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32 | * and are therefore GPL. Because of this it may be illigal to use |
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33 | * them with any software that uses libesd, libartsc or libpulse*. |
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34 | */ |
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35 | |
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36 | #include "libroar.h" |
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37 | |
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38 | struct roar_buffer_ring { |
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39 | size_t read_pos; |
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40 | size_t write_pos; |
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41 | }; |
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42 | |
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43 | struct roar_buffer { |
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44 | size_t refc; |
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45 | size_t len; |
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46 | size_t user_len; |
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47 | int flags; |
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48 | void * data; |
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49 | void * user_data; |
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50 | union { |
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51 | void * vp; |
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52 | int32_t i32; |
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53 | struct roar_buffer_ring ring; |
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54 | } meta; |
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55 | struct roar_buffer * next; |
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56 | }; |
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57 | |
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58 | int roar_buffer_new_data (struct roar_buffer ** buf, size_t len, void ** data) { |
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59 | void * bufdata; |
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60 | |
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61 | if ((bufdata = roar_mm_malloc(len)) == NULL) { |
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62 | return -1; |
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63 | } |
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64 | |
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65 | if ( roar_buffer_new_no_ma(buf, len, bufdata) == -1 ) { |
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66 | roar_mm_free(bufdata); |
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67 | return -1; |
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68 | } |
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69 | |
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70 | if ( roar_buffer_set_flag(*buf, ROAR_BUFFER_FLAG_NOFREE, ROAR_BUFFER_RESET) == -1 ) { |
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71 | roar_buffer_free(*buf); |
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72 | roar_mm_free(bufdata); |
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73 | return -1; |
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74 | } |
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75 | |
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76 | if ( data != NULL ) |
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77 | *data = bufdata; |
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78 | |
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79 | return 0; |
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80 | } |
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81 | |
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82 | int roar_buffer_new_no_ma(struct roar_buffer ** buf, size_t len, void * data) { // no internal malloc |
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83 | struct roar_buffer * new; |
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84 | |
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85 | ROAR_DBG("buffer_new(buf=%p, len=%i) = ?", buf, len); |
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86 | |
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87 | if ( buf == NULL || data == NULL ) |
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88 | return -1; |
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89 | |
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90 | if ((new = roar_mm_malloc(sizeof(struct roar_buffer))) == NULL) { |
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91 | *buf = NULL; |
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92 | return -1; |
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93 | } |
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94 | |
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95 | new->refc = 1; |
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96 | |
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97 | new->data = data; |
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98 | |
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99 | new->flags = ROAR_BUFFER_FLAG_NONE|ROAR_BUFFER_FLAG_NOFREE; |
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100 | |
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101 | new->user_data = new->data; |
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102 | |
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103 | new->next = NULL; |
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104 | |
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105 | new->len = len; |
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106 | new->user_len = len; |
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107 | *buf = new; |
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108 | |
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109 | ROAR_DBG("buffer_new(buf=%p, len=%i): New buffer at %p", buf, len, new); |
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110 | |
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111 | return 0; |
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112 | } |
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113 | |
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114 | int roar_buffer_ref (struct roar_buffer * buf) { |
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115 | if ( buf == NULL ) |
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116 | return -1; |
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117 | |
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118 | buf->refc++; |
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119 | |
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120 | return 0; |
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121 | } |
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122 | |
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123 | int roar_buffer_unref (struct roar_buffer * buf) { |
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124 | struct roar_buffer * next; |
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125 | |
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126 | if ( buf == NULL ) |
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127 | return -1; |
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128 | |
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129 | if ( buf->refc == 0 ) { |
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130 | ROAR_WARN("roar_buffer_unref(buf=%p): Ref counter is wrong. assuming one."); |
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131 | buf->refc = 1; |
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132 | } |
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133 | |
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134 | buf->refc--; |
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135 | |
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136 | if ( buf->refc ) |
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137 | return 0; |
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138 | |
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139 | while ((next = buf->next)) { |
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140 | if ( roar_buffer_get_flag(buf, ROAR_BUFFER_FLAG_NOFREE) != 1 ) |
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141 | roar_mm_free(buf->data); |
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142 | |
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143 | roar_mm_free(buf); |
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144 | buf = next; |
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145 | } |
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146 | |
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147 | if ( roar_buffer_get_flag(buf, ROAR_BUFFER_FLAG_NOFREE) != 1 ) |
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148 | roar_mm_free(buf->data); |
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149 | |
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150 | roar_mm_free(buf); |
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151 | |
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152 | return 0; |
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153 | } |
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154 | |
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155 | int roar_buffer_delete (struct roar_buffer * buf, struct roar_buffer ** next) { |
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156 | if ( buf == NULL ) { |
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157 | if ( next != NULL ) |
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158 | *next = NULL; |
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159 | return -1; |
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160 | } |
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161 | |
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162 | ROAR_DBG("buffer_delete(buf=%p, next=%p) = ?", buf, next); |
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163 | |
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164 | if ( next != NULL ) |
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165 | *next = buf->next; |
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166 | |
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167 | if ( roar_buffer_get_flag(buf, ROAR_BUFFER_FLAG_NOFREE) != 1 ) |
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168 | roar_mm_free(buf->data); |
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169 | |
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170 | roar_mm_free(buf); |
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171 | |
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172 | ROAR_DBG("buffer_delete(buf=%p, next=%p) = 0", buf, next); |
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173 | return 0; |
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174 | } |
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175 | |
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176 | int roar_buffer_add (struct roar_buffer * buf, struct roar_buffer * next) { |
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177 | unsigned int deep = 0; |
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178 | |
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179 | if ( buf == NULL ) |
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180 | return -1; |
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181 | |
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182 | ROAR_DBG("buffer_add(buf=%p, next=%p) = ?", buf, next); |
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183 | |
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184 | if ( buf->flags & ROAR_BUFFER_FLAG_RING ) |
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185 | return -1; |
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186 | |
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187 | if ( buf == next ) { |
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188 | ROAR_ERR("buffer_add(*): both pointer are of the same destination, This is a error in the application"); |
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189 | return -1; |
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190 | } |
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191 | |
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192 | while ( buf->next != NULL ) { |
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193 | ROAR_DBG("buffer_add(*): buf=%p, next=%p (len=%i)", buf, buf->next, buf->user_len); |
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194 | // ROAR_DBG("buffer_add(): buf=%p, buf->next=%p", buf, buf->next); |
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195 | buf = buf->next; |
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196 | deep++; |
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197 | |
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198 | if ( buf == next ) { |
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199 | ROAR_ERR("buffer_add(*): Can not add buffer: loop detected at deep %u. This is a error in the application", deep); |
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200 | } |
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201 | } |
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202 | |
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203 | buf->next = next; |
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204 | |
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205 | ROAR_DBG("buffer_add(*): adding buffer at deep %u", deep); |
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206 | |
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207 | return 0; |
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208 | } |
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209 | |
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210 | int roar_buffer_clear_next (struct roar_buffer * buf) { |
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211 | if ( buf == NULL ) |
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212 | return -1; |
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213 | |
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214 | buf->next = NULL; |
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215 | |
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216 | return 0; |
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217 | } |
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218 | |
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219 | int roar_buffer_get_next (struct roar_buffer * buf, struct roar_buffer ** next) { |
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220 | if ( buf == NULL ) |
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221 | return -1; |
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222 | |
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223 | *next = buf->next; |
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224 | |
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225 | return 0; |
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226 | } |
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227 | |
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228 | int roar_buffer_ring_new (struct roar_buffer ** buf, size_t len, int free_running) { |
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229 | struct roar_buffer * n; |
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230 | |
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231 | if ( buf == NULL || len == 0 ) |
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232 | return -1; |
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233 | |
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234 | // just to be sure: |
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235 | *buf = NULL; |
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236 | |
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237 | if ( roar_buffer_new(&n, len) == -1 ) |
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238 | return -1; |
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239 | |
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240 | n->flags |= ROAR_BUFFER_FLAG_RING; |
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241 | |
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242 | if ( free_running ) |
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243 | n->flags |= ROAR_BUFFER_FLAG_FREE_RUNNING; |
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244 | |
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245 | n->meta.ring.read_pos = 0; |
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246 | n->meta.ring.write_pos = 0; |
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247 | |
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248 | memset(n->data, 0, n->len); |
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249 | |
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250 | *buf = n; |
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251 | |
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252 | return 0; |
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253 | } |
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254 | |
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255 | int roar_buffer_get_data (struct roar_buffer * buf, void ** data) { |
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256 | if ( buf == NULL ) |
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257 | return -1; |
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258 | |
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259 | *data = buf->user_data; |
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260 | |
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261 | return 0; |
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262 | } |
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263 | |
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264 | int roar_buffer_set_offset (struct roar_buffer * buf, size_t off) { |
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265 | if ( buf == NULL ) |
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266 | return -1; |
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267 | |
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268 | buf->user_len -= off; |
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269 | buf->user_data += off; |
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270 | |
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271 | return 0; |
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272 | } |
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273 | |
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274 | int roar_buffer_shift_out (struct roar_buffer ** buf, void * data, size_t * len) { |
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275 | size_t todo, cl; |
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276 | struct roar_buffer * cur; |
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277 | void * cd; |
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278 | |
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279 | if ( len == NULL || buf == NULL || data == NULL ) { |
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280 | ROAR_DBG("roar_buffer_shift_out(buf=%p, data=%p, len={%lu}) = -1 // Invalid input", buf, data, (unsigned long)*len); |
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281 | return -1; |
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282 | } |
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283 | |
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284 | if ( *buf == NULL ) { |
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285 | ROAR_DBG("roar_buffer_shift_out(buf=%p, data=%p, len={%lu}) = -1 // Invalid pointer to buffer ring", buf, data, (unsigned long)len); |
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286 | return -1; |
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287 | } |
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288 | |
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289 | todo = *len; |
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290 | cur = *buf; |
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291 | |
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292 | *len = 0; |
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293 | |
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294 | while (todo && cur != NULL) { |
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295 | ROAR_DBG("roar_buffer_shift_out(*): todo=%u, cur=%p", (unsigned int) todo, cur); |
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296 | |
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297 | if ( roar_buffer_get_len(cur, &cl) == -1 ) |
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298 | return -1; |
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299 | |
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300 | if ( cl > todo ) { |
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301 | if ( roar_buffer_get_data(cur, &cd) == -1 ) |
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302 | return -1; |
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303 | |
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304 | cl = todo; |
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305 | |
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306 | memcpy(data, cd, cl); |
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307 | todo -= cl; |
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308 | data += cl; |
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309 | *len += cl; |
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310 | |
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311 | if ( roar_buffer_set_offset(cur, cl) == -1 ) |
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312 | return -1; |
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313 | } else { |
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314 | if ( roar_buffer_get_data(cur, &cd) == -1 ) |
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315 | return -1; |
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316 | |
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317 | memcpy(data, cd, cl); |
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318 | todo -= cl; |
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319 | data += cl; |
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320 | *len += cl; |
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321 | |
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322 | if ( roar_buffer_next(&cur) == -1 ) |
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323 | return -1; |
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324 | } |
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325 | |
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326 | /* |
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327 | if ( cur == NULL ) |
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328 | break; |
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329 | */ |
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330 | } |
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331 | |
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332 | *buf = cur; |
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333 | |
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334 | return 0; |
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335 | } |
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336 | |
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337 | int roar_buffer_set_meta (struct roar_buffer * buf, void * meta) { |
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338 | if ( buf == NULL ) |
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339 | return -1; |
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340 | |
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341 | buf->meta.vp = meta; |
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342 | |
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343 | return 0; |
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344 | } |
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345 | |
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346 | int roar_buffer_get_meta (struct roar_buffer * buf, void ** meta) { |
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347 | if ( buf == NULL || meta == NULL ) |
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348 | return -1; |
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349 | |
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350 | *meta = buf->meta.vp; |
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351 | |
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352 | return 0; |
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353 | } |
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354 | |
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355 | int roar_buffer_set_meta_i32(struct roar_buffer * buf, int32_t meta) { |
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356 | if ( buf == NULL ) |
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357 | return -1; |
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358 | |
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359 | buf->meta.i32 = meta; |
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360 | |
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361 | return 0; |
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362 | } |
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363 | |
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364 | int roar_buffer_get_meta_i32(struct roar_buffer * buf, int32_t * meta) { |
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365 | if ( buf == NULL || meta == NULL ) |
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366 | return -1; |
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367 | |
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368 | *meta = buf->meta.i32; |
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369 | |
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370 | return 0; |
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371 | } |
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372 | |
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373 | int roar_buffer_set_len (struct roar_buffer * buf, size_t len) { |
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374 | size_t totlen; |
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375 | void * newbuf; |
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376 | |
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377 | if ( buf == NULL ) |
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378 | return -1; |
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379 | |
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380 | // handle specal case where user length is zero: |
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381 | if ( len && !buf->user_len ) { |
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382 | buf->user_data = buf->data; |
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383 | buf->user_len = buf->len; |
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384 | } |
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385 | |
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386 | if ( len > buf->user_len ) { |
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387 | // we can only enlage a buffer if it's one of our own memory segments |
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388 | if ( buf->flags & ROAR_BUFFER_FLAG_NOFREE ) |
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389 | return -1; |
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390 | |
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391 | totlen = buf->len - buf->user_len + len; |
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392 | newbuf = roar_mm_realloc(buf->data, totlen); |
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393 | if ( newbuf == NULL ) |
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394 | return -1; |
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395 | |
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396 | buf->data = newbuf; |
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397 | buf->user_len = len; |
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398 | } else { |
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399 | buf->user_len = len; |
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400 | } |
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401 | |
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402 | return 0; |
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403 | } |
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404 | |
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405 | int roar_buffer_get_len (struct roar_buffer * buf, size_t * len) { |
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406 | if ( buf == NULL ) |
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407 | return -1; |
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408 | |
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409 | *len = buf->user_len; |
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410 | |
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411 | return 0; |
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412 | } |
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413 | |
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414 | int roar_buffer_set_flag (struct roar_buffer * buf, int flag, int reset) { |
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415 | if ( buf == NULL ) |
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416 | return -1; |
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417 | |
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418 | buf->flags |= flag; |
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419 | |
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420 | if ( reset ) |
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421 | buf->flags -= flag; |
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422 | |
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423 | return 0; |
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424 | } |
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425 | |
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426 | int roar_buffer_get_flag (struct roar_buffer * buf, int flag) { |
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427 | if ( buf == NULL ) |
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428 | return -1; |
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429 | |
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430 | return buf->flags & flag; |
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431 | } |
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432 | |
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433 | int roar_buffer_duplicate (struct roar_buffer * buf, struct roar_buffer ** copy) { |
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434 | struct roar_buffer * cur = buf; |
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435 | struct roar_buffer * new; |
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436 | void * od, * nd; |
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437 | |
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438 | *copy = NULL; |
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439 | |
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440 | while (cur) { |
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441 | if ( roar_buffer_new(&new, cur->user_len) == -1 ) { |
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442 | roar_buffer_free(*copy); |
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443 | return -1; |
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444 | } |
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445 | |
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446 | if ( *copy == NULL ) |
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447 | *copy = new; |
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448 | |
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449 | roar_buffer_get_data(cur, &od); |
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450 | roar_buffer_get_data(new, &nd); |
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451 | memcpy(nd, od, cur->user_len); |
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452 | |
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453 | roar_buffer_add(*copy, new); |
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454 | |
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455 | cur = cur->next; |
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456 | } |
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457 | return 0; |
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458 | } |
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459 | |
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460 | int roar_buffer_ring_stats (struct roar_buffer * buf, struct roar_buffer_stats * stats) { |
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461 | if ( buf == NULL ) |
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462 | return -1; |
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463 | |
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464 | stats->parts = 0; |
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465 | stats->bytes = 0; |
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466 | stats->memory_usage = 0; |
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467 | |
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468 | while (buf) { |
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469 | stats->parts++; |
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470 | stats->bytes += buf->user_len; |
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471 | stats->memory_usage += buf->len + sizeof(struct roar_buffer); |
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472 | buf = buf->next; |
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473 | } |
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474 | |
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475 | return 0; |
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476 | } |
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477 | |
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478 | int roar_buffer_ring_read (struct roar_buffer * buf, void * data, size_t * len) { |
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479 | struct roar_buffer_ring * ring; |
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480 | size_t havelen; |
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481 | size_t done; |
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482 | size_t tmp; |
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483 | |
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484 | if ( buf == NULL || len == NULL ) |
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485 | return -1; |
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486 | |
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487 | if ( data == NULL && *len != 0 ) |
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488 | return -1; |
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489 | |
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490 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) |
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491 | return -1; |
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492 | |
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493 | if ( *len == 0 ) |
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494 | return 0; |
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495 | |
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496 | // we may handle this later: |
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497 | if ( *len > buf->user_len ) |
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498 | return -1; |
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499 | |
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500 | if ( (buf->flags & ROAR_BUFFER_FLAG_FREE_RUNNING) ) { |
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501 | if ( buf->meta.ring.read_pos >= buf->user_len ) |
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502 | buf->meta.ring.read_pos -= buf->user_len; |
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503 | |
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504 | if ( (*len + buf->meta.ring.read_pos) > buf->user_len ) { |
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505 | // wraped mode: |
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506 | memcpy(data, buf->user_data+buf->meta.ring.read_pos, buf->user_len - buf->meta.ring.read_pos); |
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507 | memcpy(data, buf->user_data, *len + buf->meta.ring.read_pos - buf->user_len); |
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508 | |
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509 | buf->meta.ring.read_pos += *len; |
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510 | buf->meta.ring.read_pos -= buf->user_len; |
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511 | return 0; |
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512 | } else { |
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513 | // unwarped mode: |
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514 | memcpy(data, buf->user_data+buf->meta.ring.read_pos, *len); |
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515 | buf->meta.ring.read_pos += *len; |
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516 | return 0; |
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517 | } |
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518 | } else { |
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519 | ring = &(buf->meta.ring); |
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520 | |
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521 | if ( ring->read_pos == ring->write_pos ) { |
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522 | *len = 0; |
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523 | return 0; |
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524 | } else if ( ring->read_pos < ring->write_pos ) { |
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525 | havelen = ring->write_pos - ring->read_pos; |
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526 | |
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527 | if ( havelen > *len ) |
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528 | havelen = *len; |
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529 | |
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530 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
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531 | ring->read_pos += havelen; |
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532 | |
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533 | *len = havelen; |
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534 | return 0; |
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535 | } else { // write_pos < read_pos |
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536 | done = 0; |
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537 | |
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538 | // first pass: use data up to end of buffer |
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539 | |
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540 | havelen = buf->user_len - ring->read_pos; |
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541 | |
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542 | if ( havelen > *len ) |
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543 | havelen = *len; |
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544 | |
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545 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
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546 | ring->read_pos += havelen; |
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547 | |
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548 | done += havelen; |
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549 | |
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550 | if ( ring->read_pos == buf->user_len ) { |
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551 | ring->read_pos = 0; |
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552 | } |
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553 | |
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554 | // second pass: use data from strat of buffer to write pointer |
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555 | |
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556 | if ( *len > done ) { |
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557 | tmp = *len - done; |
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558 | if ( roar_buffer_ring_read(buf, data+done, &tmp) == 0 ) { |
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559 | done += tmp; |
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560 | } |
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561 | } |
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562 | |
---|
563 | *len = done; |
---|
564 | return 0; |
---|
565 | } |
---|
566 | |
---|
567 | return -1; |
---|
568 | } |
---|
569 | |
---|
570 | return -1; |
---|
571 | } |
---|
572 | |
---|
573 | int roar_buffer_ring_write (struct roar_buffer * buf, void * data, size_t * len) { |
---|
574 | struct roar_buffer_ring * ring; |
---|
575 | size_t havelen; |
---|
576 | size_t done; |
---|
577 | size_t tmp; |
---|
578 | |
---|
579 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
580 | |
---|
581 | if ( buf == NULL || len == NULL ) |
---|
582 | return -1; |
---|
583 | |
---|
584 | if ( data == NULL && *len != 0 ) |
---|
585 | return -1; |
---|
586 | |
---|
587 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) |
---|
588 | return -1; |
---|
589 | |
---|
590 | if ( *len == 0 ) |
---|
591 | return 0; |
---|
592 | |
---|
593 | // we may handle this later: |
---|
594 | if ( *len > buf->user_len ) |
---|
595 | return -1; |
---|
596 | |
---|
597 | if ( (buf->flags & ROAR_BUFFER_FLAG_FREE_RUNNING) ) { |
---|
598 | if ( buf->meta.ring.write_pos >= buf->user_len ) |
---|
599 | buf->meta.ring.write_pos -= buf->user_len; |
---|
600 | |
---|
601 | if ( (*len + buf->meta.ring.write_pos) > buf->user_len ) { |
---|
602 | // wraped mode: |
---|
603 | memcpy(buf->user_data+buf->meta.ring.write_pos, data, buf->user_len - buf->meta.ring.write_pos); |
---|
604 | memcpy(buf->user_data, data, *len + buf->meta.ring.write_pos - buf->user_len); |
---|
605 | |
---|
606 | buf->meta.ring.write_pos += *len; |
---|
607 | buf->meta.ring.write_pos -= buf->user_len; |
---|
608 | return 0; |
---|
609 | } else { |
---|
610 | // unwarped mode: |
---|
611 | memcpy(buf->user_data+buf->meta.ring.write_pos, data, *len); |
---|
612 | buf->meta.ring.write_pos += *len; |
---|
613 | return 0; |
---|
614 | } |
---|
615 | } else { |
---|
616 | ring = &(buf->meta.ring); |
---|
617 | done = 0; |
---|
618 | |
---|
619 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p): write_pos=%u, read_pos=%u, user_len=%u", buf, data, len, (unsigned int)ring->write_pos, (unsigned int)ring->read_pos, (unsigned int)buf->user_len); |
---|
620 | |
---|
621 | if ( ring->write_pos >= ring->read_pos ) { |
---|
622 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
623 | |
---|
624 | havelen = buf->user_len - ring->write_pos; |
---|
625 | |
---|
626 | if ( ring->read_pos == 0 ) |
---|
627 | havelen--; |
---|
628 | |
---|
629 | if ( havelen > *len ) |
---|
630 | havelen = *len; |
---|
631 | |
---|
632 | memcpy(buf->user_data+ring->write_pos, data, havelen); |
---|
633 | |
---|
634 | done += havelen; |
---|
635 | ring->write_pos += havelen; |
---|
636 | |
---|
637 | if ( ring->write_pos == buf->user_len ) |
---|
638 | ring->write_pos = 0; |
---|
639 | |
---|
640 | if ( *len > done && ring->read_pos != 0 ) { |
---|
641 | tmp = *len - done; |
---|
642 | if ( roar_buffer_ring_write(buf, data+done, &tmp) == 0 ) { |
---|
643 | done += tmp; |
---|
644 | } |
---|
645 | } |
---|
646 | |
---|
647 | *len = done; |
---|
648 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
649 | return 0; |
---|
650 | } else { |
---|
651 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
652 | |
---|
653 | // test for buffer-is-full: |
---|
654 | if ( (ring->write_pos + 1) == ring->read_pos ) { |
---|
655 | *len = 0; |
---|
656 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
657 | return 0; |
---|
658 | } |
---|
659 | |
---|
660 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
661 | |
---|
662 | havelen = ring->read_pos - ring->write_pos - 1; |
---|
663 | |
---|
664 | if ( havelen > *len ) |
---|
665 | havelen = *len; |
---|
666 | |
---|
667 | memcpy(buf->user_data+ring->write_pos, data, havelen); |
---|
668 | |
---|
669 | ring->write_pos += havelen; |
---|
670 | *len = havelen; |
---|
671 | |
---|
672 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
673 | return 0; |
---|
674 | } |
---|
675 | |
---|
676 | return -1; |
---|
677 | } |
---|
678 | |
---|
679 | return -1; |
---|
680 | } |
---|
681 | |
---|
682 | int roar_buffer_ring_avail(struct roar_buffer * buf, size_t * readlen, size_t * writelen) { |
---|
683 | struct roar_buffer_ring * ring; |
---|
684 | size_t have; |
---|
685 | |
---|
686 | if ( buf == NULL ) |
---|
687 | return -1; |
---|
688 | |
---|
689 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) |
---|
690 | return -1; |
---|
691 | |
---|
692 | ring = &(buf->meta.ring); |
---|
693 | |
---|
694 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p) = ?", buf, readlen, writelen); |
---|
695 | |
---|
696 | if ( readlen != NULL ) { |
---|
697 | have = 0; |
---|
698 | |
---|
699 | if ( ring->write_pos >= ring->read_pos ) { |
---|
700 | have = ring->write_pos - ring->read_pos; |
---|
701 | } else { |
---|
702 | have = buf->user_len - ring->read_pos; |
---|
703 | have += ring->write_pos; |
---|
704 | have -= 1; |
---|
705 | } |
---|
706 | |
---|
707 | *readlen = have; |
---|
708 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p): readlen=%llu", buf, readlen, writelen, (unsigned long long int)have); |
---|
709 | } |
---|
710 | |
---|
711 | if ( writelen != NULL ) { |
---|
712 | have = 0; |
---|
713 | |
---|
714 | if ( ring->read_pos > ring->write_pos ) { |
---|
715 | have = ring->read_pos - ring->write_pos - 1; |
---|
716 | } else { |
---|
717 | have = buf->user_len - ring->write_pos; |
---|
718 | have += ring->read_pos; |
---|
719 | have -= 1; |
---|
720 | } |
---|
721 | |
---|
722 | *writelen = have; |
---|
723 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p): readlen=%llu", buf, readlen, writelen, (unsigned long long int)have); |
---|
724 | } |
---|
725 | |
---|
726 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p) = 0", buf, readlen, writelen); |
---|
727 | |
---|
728 | return 0; |
---|
729 | } |
---|
730 | |
---|
731 | int roar_buffer_ring_reset(struct roar_buffer * buf) { |
---|
732 | if ( buf == NULL ) |
---|
733 | return -1; |
---|
734 | |
---|
735 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) |
---|
736 | return -1; |
---|
737 | |
---|
738 | buf->meta.ring.read_pos = buf->meta.ring.write_pos = 0; |
---|
739 | |
---|
740 | return 0; |
---|
741 | } |
---|
742 | |
---|
743 | //ll |
---|