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 - 2008-2012 |
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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 | int type; |
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56 | struct roar_buffer * next; |
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57 | }; |
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58 | |
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59 | #define _ckbuf_free(m) if ( buf == NULL || (m) ) { roar_err_set(ROAR_ERROR_FAULT); return -1; } |
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60 | #define _ckbuf(m) if ( _ckmem_corruption(buf, (m)) == -1 ) return -1; |
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61 | |
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62 | // if we use the 'inline' keyword here the program segfaults. why? |
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63 | static int _ckmem_corruption(volatile struct roar_buffer * buf, int m) { |
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64 | int flags; |
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65 | |
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66 | ROAR_DBG("_ckmem_corruption(buf=%p) = ?", buf); |
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67 | |
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68 | // we need to recheck here, why? |
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69 | // gcc changes the order of the above macros. why? |
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70 | // this is a strange world. |
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71 | if ( buf == NULL || m ) { |
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72 | ROAR_DBG("_ckmem_corruption(buf=%p) = -1 // FAULT", buf); |
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73 | roar_err_set(ROAR_ERROR_FAULT); |
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74 | return -1; |
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75 | } |
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76 | |
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77 | ROAR_DBG("_ckmem_corruption(buf=%p) = ?", buf); |
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78 | |
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79 | flags = buf->flags & (ROAR_BUFFER_FLAG_USEABLE|ROAR_BUFFER_FLAG_FREED); |
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80 | |
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81 | ROAR_DBG("_ckmem_corruption(buf=%p{.flags=0x%.4x, ...} = ?", buf, buf->flags); |
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82 | |
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83 | if ( flags == ROAR_BUFFER_FLAG_USEABLE ) { |
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84 | // seems ok, continue with next check. |
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85 | } else if ( flags == ROAR_BUFFER_FLAG_FREED ) { |
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86 | roar_panic(ROAR_FATAL_ERROR_MEMORY_USED_AFTER_FREE, NULL); |
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87 | roar_err_set(ROAR_ERROR_FAULT); |
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88 | return -1; |
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89 | } else { |
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90 | roar_panic(ROAR_FATAL_ERROR_MEMORY_CORRUPTION, NULL); |
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91 | roar_err_set(ROAR_ERROR_BADCKSUM); |
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92 | return -1; |
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93 | } |
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94 | |
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95 | if ( buf->refc == 0 ) { |
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96 | roar_panic(ROAR_FATAL_ERROR_MEMORY_CORRUPTION, NULL); |
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97 | roar_err_set(ROAR_ERROR_FAULT); |
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98 | return -1; |
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99 | } |
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100 | |
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101 | return 0; |
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102 | } |
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103 | |
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104 | int roar_buffer_new_data (struct roar_buffer ** buf, size_t len, void ** data) { |
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105 | void * bufdata; |
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106 | int err; |
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107 | |
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108 | if ((bufdata = roar_mm_malloc(len)) == NULL) { |
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109 | return -1; |
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110 | } |
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111 | |
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112 | if ( roar_buffer_new_no_ma(buf, len, bufdata) == -1 ) { |
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113 | err = roar_error; |
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114 | roar_mm_free(bufdata); |
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115 | roar_err_set(err); |
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116 | return -1; |
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117 | } |
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118 | |
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119 | if ( roar_buffer_set_flag(*buf, ROAR_BUFFER_FLAG_NOFREE, ROAR_BUFFER_RESET) == -1 ) { |
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120 | err = roar_error; |
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121 | roar_buffer_free(*buf); |
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122 | roar_mm_free(bufdata); |
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123 | roar_err_set(err); |
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124 | return -1; |
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125 | } |
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126 | |
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127 | if ( data != NULL ) |
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128 | *data = bufdata; |
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129 | |
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130 | return 0; |
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131 | } |
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132 | |
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133 | int roar_buffer_new_no_ma(struct roar_buffer ** buf, size_t len, void * data) { // no internal malloc |
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134 | struct roar_buffer * new; |
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135 | |
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136 | ROAR_DBG("buffer_new(buf=%p, len=%i) = ?", buf, len); |
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137 | |
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138 | _ckbuf_free(data == NULL) |
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139 | |
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140 | if ((new = roar_mm_malloc(sizeof(struct roar_buffer))) == NULL) { |
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141 | *buf = NULL; |
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142 | return -1; |
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143 | } |
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144 | |
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145 | new->refc = 1; |
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146 | |
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147 | new->data = data; |
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148 | |
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149 | new->flags = ROAR_BUFFER_FLAG_NONE|ROAR_BUFFER_FLAG_NOFREE|ROAR_BUFFER_FLAG_USEABLE; |
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150 | new->type = -1; |
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151 | |
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152 | new->user_data = new->data; |
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153 | |
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154 | new->next = NULL; |
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155 | |
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156 | new->len = len; |
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157 | new->user_len = len; |
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158 | *buf = new; |
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159 | |
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160 | ROAR_DBG("buffer_new(buf=%p, len=%i): New buffer at %p", buf, len, new); |
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161 | |
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162 | return 0; |
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163 | } |
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164 | |
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165 | int roar_buffer_ref (struct roar_buffer * buf) { |
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166 | _ckbuf(0) |
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167 | |
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168 | buf->refc++; |
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169 | |
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170 | return 0; |
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171 | } |
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172 | |
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173 | int roar_buffer_unref (struct roar_buffer * buf) { |
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174 | struct roar_buffer * next, * cur; |
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175 | int flags; |
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176 | |
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177 | ROAR_DBG("roar_buffer_unref(buf=%p) = ?", buf); |
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178 | |
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179 | _ckbuf_free(0) |
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180 | |
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181 | ROAR_DBG("roar_buffer_unref(buf=%p) = ?", buf); |
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182 | |
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183 | cur = buf; |
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184 | while (cur != NULL) { |
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185 | flags = cur->flags & (ROAR_BUFFER_FLAG_USEABLE|ROAR_BUFFER_FLAG_FREED); |
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186 | if ( flags == ROAR_BUFFER_FLAG_FREED ) { |
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187 | roar_panic(ROAR_FATAL_ERROR_MEMORY_DOUBLE_FREE, NULL); |
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188 | } |
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189 | |
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190 | _ckmem_corruption(cur, 0); |
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191 | |
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192 | if ( cur->refc == 0 ) { |
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193 | ROAR_WARN("roar_buffer_unref(buf=%p): Ref counter for buffer at %p is wrong. assuming one.", cur); |
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194 | cur->refc = 1; |
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195 | roar_panic(ROAR_FATAL_ERROR_MEMORY_CORRUPTION, NULL); |
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196 | } else if ( cur->refc > 1 ) { |
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197 | cur->refc--; |
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198 | return 0; |
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199 | } |
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200 | |
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201 | ROAR_DBG("roar_buffer_unref(buf=%p) = ?", buf); |
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202 | |
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203 | if ( roar_buffer_get_flag(cur, ROAR_BUFFER_FLAG_NOFREE) != 1 ) |
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204 | roar_mm_free(cur->data); |
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205 | |
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206 | cur->flags = ROAR_BUFFER_FLAG_FREED; |
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207 | next = cur->next; |
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208 | roar_mm_free(cur); |
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209 | cur = next; |
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210 | } |
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211 | |
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212 | ROAR_DBG("roar_buffer_unref(buf=%p) = 0", buf); |
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213 | return 0; |
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214 | } |
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215 | |
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216 | int roar_buffer_delete (struct roar_buffer * buf, struct roar_buffer ** next) { |
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217 | if ( buf == NULL ) { |
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218 | if ( next != NULL ) |
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219 | *next = NULL; |
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220 | roar_err_set(ROAR_ERROR_FAULT); |
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221 | return -1; |
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222 | } |
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223 | |
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224 | ROAR_DBG("roar_buffer_delete(buf=%p, next=%p) = ?", buf, next); |
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225 | |
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226 | if ( next != NULL ) { |
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227 | *next = buf; |
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228 | return roar_buffer_next(next); |
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229 | } else { |
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230 | return roar_buffer_unref(buf); |
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231 | } |
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232 | } |
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233 | |
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234 | int roar_buffer_next (struct roar_buffer ** buf) { |
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235 | struct roar_buffer * ret; |
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236 | |
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237 | if ( buf == NULL || *buf == NULL ) { |
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238 | roar_err_set(ROAR_ERROR_FAULT); |
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239 | } |
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240 | |
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241 | ret = (*buf)->next; |
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242 | |
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243 | if ( ret != NULL ) |
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244 | roar_buffer_ref(ret); |
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245 | |
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246 | roar_buffer_unref(*buf); |
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247 | |
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248 | *buf = ret; |
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249 | |
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250 | return 0; |
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251 | } |
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252 | |
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253 | int roar_buffer_add (struct roar_buffer * buf, struct roar_buffer * next) { |
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254 | if ( roar_buffer_ref(next) == -1 ) |
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255 | return -1; |
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256 | return roar_buffer_moveinto(buf, &next); |
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257 | } |
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258 | |
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259 | int roar_buffer_moveinto (struct roar_buffer * buf, struct roar_buffer ** next) { |
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260 | unsigned int deep = 0; |
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261 | |
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262 | _ckbuf(next == NULL || _ckmem_corruption(*next, 0)) |
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263 | |
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264 | ROAR_DBG("buffer_add(buf=%p, next=%p) = ?", buf, next); |
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265 | ROAR_DBG("buffer_add(buf=%p, next=%p): *next=%p", buf, next, *next); |
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266 | |
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267 | if ( buf->flags & ROAR_BUFFER_FLAG_RING ) { |
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268 | roar_err_set(ROAR_ERROR_INVAL); |
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269 | return -1; |
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270 | } |
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271 | |
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272 | if ( buf == *next ) { |
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273 | ROAR_ERR("buffer_add(*): both pointer are of the same destination, This is a error in the application"); |
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274 | roar_err_set(ROAR_ERROR_INVAL); |
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275 | return -1; |
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276 | } |
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277 | |
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278 | while ( buf->next != NULL ) { |
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279 | ROAR_DBG("buffer_add(*): buf=%p, next=%p (len=%i)", buf, buf->next, buf->user_len); |
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280 | // ROAR_DBG("buffer_add(): buf=%p, buf->next=%p", buf, buf->next); |
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281 | buf = buf->next; |
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282 | deep++; |
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283 | |
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284 | if ( buf == *next ) { |
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285 | 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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286 | // why don't we return here? |
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287 | } |
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288 | } |
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289 | |
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290 | buf->next = *next; |
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291 | |
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292 | ROAR_DBG("buffer_add(*): adding buffer at deep %u", deep); |
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293 | |
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294 | *next = NULL; |
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295 | |
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296 | return 0; |
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297 | } |
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298 | |
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299 | int roar_buffer_get_next (struct roar_buffer * buf, struct roar_buffer ** next) { |
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300 | _ckbuf(0) |
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301 | |
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302 | *next = buf->next; |
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303 | |
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304 | return roar_buffer_ref(*next); |
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305 | } |
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306 | |
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307 | int roar_buffer_ring_new (struct roar_buffer ** buf, size_t len, int free_running) { |
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308 | struct roar_buffer * n; |
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309 | |
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310 | _ckbuf_free(0) |
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311 | |
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312 | if ( len == 0 ) { |
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313 | roar_err_set(ROAR_ERROR_RANGE); |
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314 | return -1; |
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315 | } |
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316 | |
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317 | // just to be sure: |
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318 | *buf = NULL; |
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319 | |
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320 | if ( roar_buffer_new(&n, len) == -1 ) |
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321 | return -1; |
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322 | |
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323 | n->flags |= ROAR_BUFFER_FLAG_RING; |
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324 | |
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325 | if ( free_running ) |
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326 | n->flags |= ROAR_BUFFER_FLAG_FREE_RUNNING; |
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327 | |
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328 | n->meta.ring.read_pos = 0; |
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329 | n->meta.ring.write_pos = 0; |
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330 | |
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331 | memset(n->data, 0, n->len); |
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332 | |
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333 | *buf = n; |
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334 | |
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335 | return 0; |
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336 | } |
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337 | |
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338 | int roar_buffer_get_data (struct roar_buffer * buf, void ** data) { |
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339 | _ckbuf(data == NULL) |
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340 | |
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341 | *data = buf->user_data; |
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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_datalen(struct roar_buffer * buf, void ** data, size_t * len) { |
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347 | _ckbuf(0) |
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348 | |
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349 | if ( data != NULL ) |
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350 | *data = buf->user_data; |
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351 | if ( len != NULL ) |
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352 | *len = buf->user_len; |
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353 | |
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354 | return 0; |
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355 | } |
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356 | |
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357 | int roar_buffer_set_offset (struct roar_buffer * buf, size_t off) { |
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358 | _ckbuf(0) |
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359 | |
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360 | if ( off > buf->user_len ) { |
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361 | roar_err_set(ROAR_ERROR_RANGE); |
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362 | return -1; |
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363 | } |
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364 | |
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365 | buf->user_len -= off; |
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366 | buf->user_data += off; |
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367 | |
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368 | return 0; |
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369 | } |
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370 | |
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371 | int roar_buffer_shift_out (struct roar_buffer ** buf, void * data, size_t * len) { |
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372 | size_t todo, cl; |
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373 | struct roar_buffer * cur; |
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374 | void * cd; |
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375 | |
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376 | _ckbuf_free(len == NULL || data == NULL); |
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377 | |
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378 | if ( *buf == NULL ) { |
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379 | 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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380 | roar_err_set(ROAR_ERROR_FAULT); |
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381 | return -1; |
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382 | } |
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383 | |
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384 | todo = *len; |
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385 | cur = *buf; |
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386 | |
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387 | *len = 0; |
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388 | |
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389 | while (todo && cur != NULL) { |
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390 | ROAR_DBG("roar_buffer_shift_out(*): todo=%u, cur=%p", (unsigned int) todo, cur); |
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391 | |
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392 | _ckmem_corruption(cur, 0); |
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393 | |
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394 | if ( roar_buffer_get_len(cur, &cl) == -1 ) |
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395 | return -1; |
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396 | |
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397 | if ( cl > todo ) { |
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398 | if ( roar_buffer_get_data(cur, &cd) == -1 ) |
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399 | return -1; |
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400 | |
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401 | cl = todo; |
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402 | |
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403 | memcpy(data, cd, cl); |
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404 | todo -= cl; |
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405 | data += cl; |
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406 | *len += cl; |
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407 | |
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408 | if ( roar_buffer_set_offset(cur, cl) == -1 ) |
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409 | return -1; |
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410 | } else { |
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411 | if ( roar_buffer_get_data(cur, &cd) == -1 ) |
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412 | return -1; |
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413 | |
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414 | memcpy(data, cd, cl); |
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415 | todo -= cl; |
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416 | data += cl; |
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417 | *len += cl; |
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418 | |
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419 | if ( roar_buffer_next(&cur) == -1 ) |
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420 | return -1; |
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421 | } |
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422 | |
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423 | /* |
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424 | if ( cur == NULL ) |
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425 | break; |
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426 | */ |
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427 | } |
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428 | |
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429 | *buf = cur; |
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430 | |
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431 | return 0; |
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432 | } |
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433 | |
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434 | int roar_buffer_set_meta (struct roar_buffer * buf, void * meta) { |
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435 | _ckbuf(0) |
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436 | |
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437 | buf->meta.vp = meta; |
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438 | |
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439 | return 0; |
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440 | } |
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441 | |
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442 | int roar_buffer_get_meta (struct roar_buffer * buf, void ** meta) { |
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443 | _ckbuf(meta == NULL) |
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444 | |
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445 | *meta = buf->meta.vp; |
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446 | |
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447 | return 0; |
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448 | } |
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449 | |
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450 | int roar_buffer_set_meta_i32(struct roar_buffer * buf, int32_t meta) { |
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451 | _ckbuf(0) |
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452 | |
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453 | buf->meta.i32 = meta; |
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454 | |
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455 | return 0; |
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456 | } |
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457 | |
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458 | int roar_buffer_get_meta_i32(struct roar_buffer * buf, int32_t * meta) { |
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459 | _ckbuf(meta == NULL) |
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460 | |
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461 | *meta = buf->meta.i32; |
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462 | |
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463 | return 0; |
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464 | } |
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465 | |
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466 | int roar_buffer_set_type (struct roar_buffer * buf, int type) { |
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467 | _ckbuf(0) |
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468 | |
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469 | switch (type) { |
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470 | case ROAR_VIO_DFT_RAW: |
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471 | case ROAR_VIO_DFT_PACKET: |
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472 | case ROAR_VIO_DFT_UNFRAMED: |
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473 | case ROAR_VIO_DFT_OGG_PACKET: |
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474 | case ROAR_VIO_DFT_OGG_PAGE: |
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475 | break; |
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476 | default: |
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477 | roar_err_set(ROAR_ERROR_NOTSUP); |
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478 | return -1; |
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479 | } |
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480 | |
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481 | buf->type = type; |
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482 | |
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483 | return 0; |
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484 | } |
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485 | |
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486 | int roar_buffer_get_type (struct roar_buffer * buf, int * type) { |
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487 | _ckbuf(type == NULL) |
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488 | |
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489 | *type = buf->type; |
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490 | |
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491 | return 0; |
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492 | } |
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493 | |
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494 | int roar_buffer_set_len (struct roar_buffer * buf, size_t len) { |
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495 | size_t totlen; |
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496 | void * newbuf; |
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497 | |
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498 | _ckbuf(0) |
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499 | |
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500 | // handle specal case where user length is zero: |
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501 | if ( len && !buf->user_len ) { |
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502 | buf->user_data = buf->data; |
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503 | buf->user_len = buf->len; |
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504 | } |
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505 | |
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506 | if ( len > buf->user_len ) { |
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507 | // we can only enlage a buffer if it's one of our own memory segments |
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508 | if ( buf->flags & ROAR_BUFFER_FLAG_NOFREE ) { |
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509 | roar_err_set(ROAR_ERROR_NOTSUP); |
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510 | return -1; |
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511 | } |
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512 | |
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513 | totlen = (buf->len - buf->user_len) + len; |
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514 | newbuf = roar_mm_realloc(buf->data, totlen); |
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515 | if ( newbuf == NULL ) |
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516 | return -1; |
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517 | |
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518 | buf->user_data = newbuf + (buf->user_data - buf->data); |
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519 | buf->user_len = len; |
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520 | buf->data = newbuf; |
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521 | buf->len = totlen; |
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522 | } else { |
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523 | buf->user_len = len; |
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524 | } |
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525 | |
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526 | return 0; |
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527 | } |
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528 | |
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529 | int roar_buffer_get_len (struct roar_buffer * buf, size_t * len) { |
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530 | _ckbuf(0) |
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531 | |
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532 | *len = buf->user_len; |
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533 | |
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534 | return 0; |
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535 | } |
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536 | |
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537 | int roar_buffer_set_flag (struct roar_buffer * buf, int flag, int reset) { |
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538 | _ckbuf(0) |
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539 | |
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540 | buf->flags |= flag; |
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541 | |
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542 | if ( reset ) |
---|
543 | buf->flags -= flag; |
---|
544 | |
---|
545 | return 0; |
---|
546 | } |
---|
547 | |
---|
548 | int roar_buffer_get_flag (struct roar_buffer * buf, int flag) { |
---|
549 | _ckbuf(0) |
---|
550 | |
---|
551 | return buf->flags & flag; |
---|
552 | } |
---|
553 | |
---|
554 | int roar_buffer_duplicate (struct roar_buffer * buf, struct roar_buffer ** copy) { |
---|
555 | struct roar_buffer * cur = buf; |
---|
556 | struct roar_buffer * new; |
---|
557 | void * od, * nd; |
---|
558 | int err; |
---|
559 | |
---|
560 | _ckbuf(copy == NULL) |
---|
561 | |
---|
562 | *copy = NULL; |
---|
563 | |
---|
564 | // TODO: This function does not handle ring buffers. |
---|
565 | // FIXME: This function does not error out in case of wrong buffer type in buf. |
---|
566 | // TODO: This function does not handle buffer meta data. |
---|
567 | |
---|
568 | while (cur != NULL) { |
---|
569 | if ( roar_buffer_new(&new, cur->user_len) == -1 ) { |
---|
570 | err = roar_error; |
---|
571 | roar_buffer_free(*copy); |
---|
572 | roar_err_set(err); |
---|
573 | return -1; |
---|
574 | } |
---|
575 | |
---|
576 | if ( *copy == NULL ) |
---|
577 | *copy = new; |
---|
578 | |
---|
579 | _LIBROAR_IGNORE_RET(roar_buffer_get_data(cur, &od)); |
---|
580 | _LIBROAR_IGNORE_RET(roar_buffer_get_data(new, &nd)); |
---|
581 | memcpy(nd, od, cur->user_len); |
---|
582 | |
---|
583 | _LIBROAR_IGNORE_RET(roar_buffer_moveinto(*copy, &new)); |
---|
584 | |
---|
585 | cur = cur->next; |
---|
586 | } |
---|
587 | |
---|
588 | return 0; |
---|
589 | } |
---|
590 | |
---|
591 | int roar_buffer_ring_stats (struct roar_buffer * buf, struct roar_buffer_stats * stats) { |
---|
592 | ROAR_DBG("roar_buffer_ring_stats(buf=%p, stats=%p) = ?", buf, stats); |
---|
593 | |
---|
594 | _ckbuf(0) |
---|
595 | |
---|
596 | ROAR_DBG("roar_buffer_ring_stats(buf=%p, stats=%p) = ?", buf, stats); |
---|
597 | |
---|
598 | stats->parts = 0; |
---|
599 | stats->bytes = 0; |
---|
600 | stats->memory_usage = 0; |
---|
601 | |
---|
602 | while (buf != NULL ) { |
---|
603 | stats->parts++; |
---|
604 | stats->bytes += buf->user_len; |
---|
605 | stats->memory_usage += buf->len + sizeof(struct roar_buffer); |
---|
606 | buf = buf->next; |
---|
607 | } |
---|
608 | |
---|
609 | return 0; |
---|
610 | } |
---|
611 | |
---|
612 | int roar_buffer_ring_read (struct roar_buffer * buf, void * data, size_t * len) { |
---|
613 | struct roar_buffer_ring * ring; |
---|
614 | size_t havelen; |
---|
615 | size_t done; |
---|
616 | size_t tmp; |
---|
617 | |
---|
618 | _ckbuf(len == NULL) |
---|
619 | |
---|
620 | if ( buf == NULL || len == NULL ) |
---|
621 | return -1; |
---|
622 | |
---|
623 | if ( data == NULL && *len != 0 ) { |
---|
624 | roar_err_set(ROAR_ERROR_FAULT); |
---|
625 | return -1; |
---|
626 | } |
---|
627 | |
---|
628 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) { |
---|
629 | roar_err_set(ROAR_ERROR_TYPEMM); |
---|
630 | return -1; |
---|
631 | } |
---|
632 | |
---|
633 | if ( *len == 0 ) |
---|
634 | return 0; |
---|
635 | |
---|
636 | // we may handle this later: |
---|
637 | if ( *len > buf->user_len ) { |
---|
638 | roar_err_set(ROAR_ERROR_NOTSUP); |
---|
639 | return -1; |
---|
640 | } |
---|
641 | |
---|
642 | if ( (buf->flags & ROAR_BUFFER_FLAG_FREE_RUNNING) ) { |
---|
643 | if ( buf->meta.ring.read_pos >= buf->user_len ) |
---|
644 | buf->meta.ring.read_pos -= buf->user_len; |
---|
645 | |
---|
646 | if ( (*len + buf->meta.ring.read_pos) > buf->user_len ) { |
---|
647 | // wraped mode: |
---|
648 | memcpy(data, buf->user_data+buf->meta.ring.read_pos, buf->user_len - buf->meta.ring.read_pos); |
---|
649 | memcpy(data, buf->user_data, *len + buf->meta.ring.read_pos - buf->user_len); |
---|
650 | |
---|
651 | buf->meta.ring.read_pos += *len; |
---|
652 | buf->meta.ring.read_pos -= buf->user_len; |
---|
653 | return 0; |
---|
654 | } else { |
---|
655 | // unwarped mode: |
---|
656 | memcpy(data, buf->user_data+buf->meta.ring.read_pos, *len); |
---|
657 | buf->meta.ring.read_pos += *len; |
---|
658 | return 0; |
---|
659 | } |
---|
660 | } else { |
---|
661 | ring = &(buf->meta.ring); |
---|
662 | |
---|
663 | if ( ring->read_pos == ring->write_pos ) { |
---|
664 | *len = 0; |
---|
665 | return 0; |
---|
666 | } else if ( ring->read_pos < ring->write_pos ) { |
---|
667 | havelen = ring->write_pos - ring->read_pos; |
---|
668 | |
---|
669 | if ( havelen > *len ) |
---|
670 | havelen = *len; |
---|
671 | |
---|
672 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
---|
673 | ring->read_pos += havelen; |
---|
674 | |
---|
675 | *len = havelen; |
---|
676 | return 0; |
---|
677 | } else { // write_pos < read_pos |
---|
678 | done = 0; |
---|
679 | |
---|
680 | // first pass: use data up to end of buffer |
---|
681 | |
---|
682 | havelen = buf->user_len - ring->read_pos; |
---|
683 | |
---|
684 | if ( havelen > *len ) |
---|
685 | havelen = *len; |
---|
686 | |
---|
687 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
---|
688 | ring->read_pos += havelen; |
---|
689 | |
---|
690 | done += havelen; |
---|
691 | |
---|
692 | if ( ring->read_pos == buf->user_len ) { |
---|
693 | ring->read_pos = 0; |
---|
694 | } |
---|
695 | |
---|
696 | // second pass: use data from strat of buffer to write pointer |
---|
697 | |
---|
698 | if ( *len > done ) { |
---|
699 | tmp = *len - done; |
---|
700 | if ( roar_buffer_ring_read(buf, data+done, &tmp) == 0 ) { |
---|
701 | done += tmp; |
---|
702 | } |
---|
703 | } |
---|
704 | |
---|
705 | *len = done; |
---|
706 | return 0; |
---|
707 | } |
---|
708 | } |
---|
709 | |
---|
710 | roar_err_set(ROAR_ERROR_UNKNOWN); |
---|
711 | return -1; |
---|
712 | } |
---|
713 | |
---|
714 | int roar_buffer_ring_write (struct roar_buffer * buf, void * data, size_t * len) { |
---|
715 | struct roar_buffer_ring * ring; |
---|
716 | size_t havelen; |
---|
717 | size_t done; |
---|
718 | size_t tmp; |
---|
719 | |
---|
720 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
721 | |
---|
722 | _ckbuf(len == NULL) |
---|
723 | |
---|
724 | if ( data == NULL && *len != 0 ) { |
---|
725 | roar_err_set(ROAR_ERROR_FAULT); |
---|
726 | return -1; |
---|
727 | } |
---|
728 | |
---|
729 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) { |
---|
730 | roar_err_set(ROAR_ERROR_TYPEMM); |
---|
731 | return -1; |
---|
732 | } |
---|
733 | |
---|
734 | if ( *len == 0 ) |
---|
735 | return 0; |
---|
736 | |
---|
737 | // we may handle this later: |
---|
738 | if ( *len > buf->user_len ) { |
---|
739 | roar_err_set(ROAR_ERROR_NOTSUP); |
---|
740 | return -1; |
---|
741 | } |
---|
742 | |
---|
743 | if ( (buf->flags & ROAR_BUFFER_FLAG_FREE_RUNNING) ) { |
---|
744 | if ( buf->meta.ring.write_pos >= buf->user_len ) |
---|
745 | buf->meta.ring.write_pos -= buf->user_len; |
---|
746 | |
---|
747 | if ( (*len + buf->meta.ring.write_pos) > buf->user_len ) { |
---|
748 | // wraped mode: |
---|
749 | memcpy(buf->user_data+buf->meta.ring.write_pos, data, buf->user_len - buf->meta.ring.write_pos); |
---|
750 | memcpy(buf->user_data, data, *len + buf->meta.ring.write_pos - buf->user_len); |
---|
751 | |
---|
752 | buf->meta.ring.write_pos += *len; |
---|
753 | buf->meta.ring.write_pos -= buf->user_len; |
---|
754 | return 0; |
---|
755 | } else { |
---|
756 | // unwarped mode: |
---|
757 | memcpy(buf->user_data+buf->meta.ring.write_pos, data, *len); |
---|
758 | buf->meta.ring.write_pos += *len; |
---|
759 | return 0; |
---|
760 | } |
---|
761 | } else { |
---|
762 | ring = &(buf->meta.ring); |
---|
763 | done = 0; |
---|
764 | |
---|
765 | 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); |
---|
766 | |
---|
767 | if ( ring->write_pos >= ring->read_pos ) { |
---|
768 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
769 | |
---|
770 | havelen = buf->user_len - ring->write_pos; |
---|
771 | |
---|
772 | if ( ring->read_pos == 0 ) |
---|
773 | havelen--; |
---|
774 | |
---|
775 | if ( havelen > *len ) |
---|
776 | havelen = *len; |
---|
777 | |
---|
778 | memcpy(buf->user_data+ring->write_pos, data, havelen); |
---|
779 | |
---|
780 | done += havelen; |
---|
781 | ring->write_pos += havelen; |
---|
782 | |
---|
783 | if ( ring->write_pos == buf->user_len ) |
---|
784 | ring->write_pos = 0; |
---|
785 | |
---|
786 | if ( *len > done && ring->read_pos != 0 ) { |
---|
787 | tmp = *len - done; |
---|
788 | if ( roar_buffer_ring_write(buf, data+done, &tmp) == 0 ) { |
---|
789 | done += tmp; |
---|
790 | } |
---|
791 | } |
---|
792 | |
---|
793 | *len = done; |
---|
794 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
795 | return 0; |
---|
796 | } else { |
---|
797 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
798 | |
---|
799 | // test for buffer-is-full: |
---|
800 | if ( (ring->write_pos + 1) == ring->read_pos ) { |
---|
801 | *len = 0; |
---|
802 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
803 | return 0; |
---|
804 | } |
---|
805 | |
---|
806 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
807 | |
---|
808 | havelen = ring->read_pos - ring->write_pos - 1; |
---|
809 | |
---|
810 | if ( havelen > *len ) |
---|
811 | havelen = *len; |
---|
812 | |
---|
813 | memcpy(buf->user_data+ring->write_pos, data, havelen); |
---|
814 | |
---|
815 | ring->write_pos += havelen; |
---|
816 | *len = havelen; |
---|
817 | |
---|
818 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
819 | return 0; |
---|
820 | } |
---|
821 | } |
---|
822 | |
---|
823 | roar_err_set(ROAR_ERROR_UNKNOWN); |
---|
824 | return -1; |
---|
825 | } |
---|
826 | |
---|
827 | int roar_buffer_ring_avail(struct roar_buffer * buf, size_t * readlen, size_t * writelen) { |
---|
828 | struct roar_buffer_ring * ring; |
---|
829 | size_t have; |
---|
830 | |
---|
831 | _ckbuf(0) |
---|
832 | |
---|
833 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) { |
---|
834 | roar_err_set(ROAR_ERROR_TYPEMM); |
---|
835 | return -1; |
---|
836 | } |
---|
837 | |
---|
838 | ring = &(buf->meta.ring); |
---|
839 | |
---|
840 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p) = ?", buf, readlen, writelen); |
---|
841 | |
---|
842 | if ( readlen != NULL ) { |
---|
843 | have = 0; |
---|
844 | |
---|
845 | if ( ring->write_pos >= ring->read_pos ) { |
---|
846 | have = ring->write_pos - ring->read_pos; |
---|
847 | } else { |
---|
848 | have = buf->user_len - ring->read_pos; |
---|
849 | have += ring->write_pos; |
---|
850 | have -= 1; |
---|
851 | } |
---|
852 | |
---|
853 | *readlen = have; |
---|
854 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p): readlen=%llu", buf, readlen, writelen, (unsigned long long int)have); |
---|
855 | } |
---|
856 | |
---|
857 | if ( writelen != NULL ) { |
---|
858 | have = 0; |
---|
859 | |
---|
860 | if ( ring->read_pos > ring->write_pos ) { |
---|
861 | have = ring->read_pos - ring->write_pos - 1; |
---|
862 | } else { |
---|
863 | have = buf->user_len - ring->write_pos; |
---|
864 | have += ring->read_pos; |
---|
865 | have -= 1; |
---|
866 | } |
---|
867 | |
---|
868 | *writelen = have; |
---|
869 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p): readlen=%llu", buf, readlen, writelen, (unsigned long long int)have); |
---|
870 | } |
---|
871 | |
---|
872 | ROAR_DBG("roar_buffer_ring_avail(buf=%p, readlen=%p, writelen=%p) = 0", buf, readlen, writelen); |
---|
873 | |
---|
874 | return 0; |
---|
875 | } |
---|
876 | |
---|
877 | int roar_buffer_ring_reset(struct roar_buffer * buf) { |
---|
878 | _ckbuf(0) |
---|
879 | |
---|
880 | if ( !(buf->flags & ROAR_BUFFER_FLAG_RING) ) { |
---|
881 | roar_err_set(ROAR_ERROR_TYPEMM); |
---|
882 | return -1; |
---|
883 | } |
---|
884 | |
---|
885 | buf->meta.ring.read_pos = buf->meta.ring.write_pos = 0; |
---|
886 | |
---|
887 | return 0; |
---|
888 | } |
---|
889 | |
---|
890 | //ll |
---|