[0] | 1 | //buffer.c: |
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| 2 | |
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[690] | 3 | /* |
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[4708] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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[690] | 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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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[690] | 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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[0] | 36 | #include "libroar.h" |
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| 37 | |
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[4516] | 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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[1215] | 57 | |
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[3764] | 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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[1215] | 62 | return -1; |
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| 63 | } |
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| 64 | |
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[3764] | 65 | if ( roar_buffer_new_no_ma(buf, len, bufdata) == -1 ) { |
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| 66 | roar_mm_free(bufdata); |
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[1215] | 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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[3764] | 72 | roar_mm_free(bufdata); |
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[1215] | 73 | return -1; |
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| 74 | } |
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| 75 | |
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[3764] | 76 | if ( data != NULL ) |
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| 77 | *data = bufdata; |
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| 78 | |
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[1215] | 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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[0] | 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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[1215] | 87 | if ( buf == NULL || data == NULL ) |
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| 88 | return -1; |
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| 89 | |
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[2976] | 90 | if ((new = roar_mm_malloc(sizeof(struct roar_buffer))) == NULL) { |
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[0] | 91 | *buf = NULL; |
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| 92 | return -1; |
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| 93 | } |
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| 94 | |
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[4522] | 95 | new->refc = 1; |
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| 96 | |
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[1215] | 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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[0] | 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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[4522] | 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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[0] | 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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[4522] | 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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[0] | 139 | while ((next = buf->next)) { |
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[2976] | 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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[0] | 144 | buf = next; |
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| 145 | } |
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| 146 | |
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[1215] | 147 | if ( roar_buffer_get_flag(buf, ROAR_BUFFER_FLAG_NOFREE) != 1 ) |
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[2976] | 148 | roar_mm_free(buf->data); |
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[1215] | 149 | |
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[2976] | 150 | roar_mm_free(buf); |
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[0] | 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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[2976] | 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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[0] | 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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[1953] | 177 | unsigned int deep = 0; |
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| 178 | |
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[0] | 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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[3020] | 184 | if ( buf->flags & ROAR_BUFFER_FLAG_RING ) |
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| 185 | return -1; |
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| 186 | |
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[1953] | 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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[0] | 192 | while ( buf->next != NULL ) { |
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[302] | 193 | ROAR_DBG("buffer_add(*): buf=%p, next=%p (len=%i)", buf, buf->next, buf->user_len); |
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[0] | 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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[1953] | 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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[0] | 201 | } |
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| 202 | |
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| 203 | buf->next = next; |
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| 204 | |
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[1953] | 205 | ROAR_DBG("buffer_add(*): adding buffer at deep %u", deep); |
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| 206 | |
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[0] | 207 | return 0; |
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| 208 | } |
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| 209 | |
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[4516] | 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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[0] | 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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[3020] | 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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[0] | 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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[904] | 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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[996] | 279 | if ( len == NULL || buf == NULL || data == NULL ) { |
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[2101] | 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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[904] | 281 | return -1; |
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[996] | 282 | } |
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[904] | 283 | |
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[996] | 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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[904] | 286 | return -1; |
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[996] | 287 | } |
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[904] | 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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[2066] | 294 | while (todo && cur != NULL) { |
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[904] | 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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[996] | 334 | return 0; |
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[904] | 335 | } |
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| 336 | |
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[0] | 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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[2333] | 341 | buf->meta.vp = meta; |
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[0] | 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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[2333] | 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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[0] | 356 | if ( buf == NULL ) |
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| 357 | return -1; |
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| 358 | |
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[2333] | 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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[0] | 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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[2334] | 374 | size_t totlen; |
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| 375 | void * newbuf; |
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| 376 | |
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[0] | 377 | if ( buf == NULL ) |
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| 378 | return -1; |
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| 379 | |
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[3032] | 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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[2334] | 386 | if ( len > buf->user_len ) { |
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[3021] | 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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[2334] | 391 | totlen = buf->len - buf->user_len + len; |
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[3021] | 392 | newbuf = roar_mm_realloc(buf->data, totlen); |
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[2334] | 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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[0] | 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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[1215] | 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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[46] | 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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[48] | 436 | void * od, * nd; |
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[46] | 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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[48] | 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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[46] | 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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[7] | 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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[3020] | 478 | int roar_buffer_ring_read (struct roar_buffer * buf, void * data, size_t * len) { |
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[4615] | 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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[3020] | 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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[4615] | 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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[3020] | 503 | |
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[4615] | 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); |
---|
| 508 | |
---|
| 509 | buf->meta.ring.read_pos += *len; |
---|
| 510 | buf->meta.ring.read_pos -= buf->user_len; |
---|
| 511 | return 0; |
---|
| 512 | } else { |
---|
| 513 | // unwarped mode: |
---|
| 514 | memcpy(data, buf->user_data+buf->meta.ring.read_pos, *len); |
---|
| 515 | buf->meta.ring.read_pos += *len; |
---|
| 516 | return 0; |
---|
| 517 | } |
---|
| 518 | } else { |
---|
| 519 | ring = &(buf->meta.ring); |
---|
| 520 | |
---|
| 521 | if ( ring->read_pos == ring->write_pos ) { |
---|
| 522 | *len = 0; |
---|
| 523 | return 0; |
---|
| 524 | } else if ( ring->read_pos < ring->write_pos ) { |
---|
| 525 | havelen = ring->write_pos - ring->read_pos; |
---|
| 526 | |
---|
| 527 | if ( havelen > *len ) |
---|
| 528 | havelen = *len; |
---|
| 529 | |
---|
| 530 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
---|
| 531 | ring->read_pos += havelen; |
---|
[3020] | 532 | |
---|
[4615] | 533 | *len = havelen; |
---|
| 534 | return 0; |
---|
| 535 | } else { // write_pos < read_pos |
---|
| 536 | done = 0; |
---|
| 537 | |
---|
| 538 | // first pass: use data up to end of buffer |
---|
| 539 | |
---|
| 540 | havelen = buf->user_len - ring->read_pos; |
---|
| 541 | |
---|
| 542 | if ( havelen > *len ) |
---|
| 543 | havelen = *len; |
---|
| 544 | |
---|
| 545 | memcpy(data, buf->user_data+ring->read_pos, havelen); |
---|
| 546 | ring->read_pos += havelen; |
---|
| 547 | |
---|
| 548 | done += havelen; |
---|
| 549 | |
---|
| 550 | if ( ring->read_pos == buf->user_len ) { |
---|
| 551 | ring->read_pos = 0; |
---|
| 552 | } |
---|
| 553 | |
---|
| 554 | // second pass: use data from strat of buffer to write pointer |
---|
| 555 | |
---|
| 556 | if ( *len > done ) { |
---|
| 557 | tmp = *len - done; |
---|
| 558 | if ( roar_buffer_ring_read(buf, data+done, &tmp) == 0 ) { |
---|
| 559 | done += tmp; |
---|
| 560 | } |
---|
| 561 | } |
---|
| 562 | |
---|
| 563 | *len = done; |
---|
| 564 | return 0; |
---|
| 565 | } |
---|
| 566 | |
---|
| 567 | return -1; |
---|
[3020] | 568 | } |
---|
| 569 | |
---|
| 570 | return -1; |
---|
| 571 | } |
---|
| 572 | |
---|
| 573 | int roar_buffer_ring_write (struct roar_buffer * buf, void * data, size_t * len) { |
---|
[4624] | 574 | struct roar_buffer_ring * ring; |
---|
| 575 | size_t havelen; |
---|
| 576 | size_t done; |
---|
| 577 | size_t tmp; |
---|
| 578 | |
---|
[4625] | 579 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
| 580 | |
---|
[3020] | 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 | |
---|
[4615] | 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; |
---|
[3020] | 600 | |
---|
[4615] | 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); |
---|
[3020] | 605 | |
---|
[4615] | 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 | } |
---|
[3020] | 615 | } else { |
---|
[4624] | 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 ) { |
---|
[4625] | 622 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
| 623 | |
---|
[4624] | 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; |
---|
[4625] | 648 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
[4624] | 649 | return 0; |
---|
| 650 | } else { |
---|
[4625] | 651 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
| 652 | |
---|
[4624] | 653 | // test for buffer-is-full: |
---|
| 654 | if ( (ring->write_pos + 1) == ring->read_pos ) { |
---|
| 655 | *len = 0; |
---|
[4625] | 656 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
[4624] | 657 | return 0; |
---|
| 658 | } |
---|
| 659 | |
---|
[4625] | 660 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = ?", buf, data, len); |
---|
| 661 | |
---|
[4624] | 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 | |
---|
[4625] | 669 | ring->write_pos += havelen; |
---|
[4624] | 670 | *len = havelen; |
---|
[4625] | 671 | |
---|
| 672 | ROAR_DBG("roar_buffer_ring_write(buf=%p, data=%p, len=%p) = 0", buf, data, len); |
---|
[4624] | 673 | return 0; |
---|
| 674 | } |
---|
| 675 | |
---|
[4615] | 676 | return -1; |
---|
[3020] | 677 | } |
---|
| 678 | |
---|
| 679 | return -1; |
---|
| 680 | } |
---|
| 681 | |
---|
[4625] | 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 | |
---|
[4629] | 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 | |
---|
[0] | 743 | //ll |
---|