root/src/ftdm_buffer.c

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DEFINITIONS

This source file includes following definitions.
  1. FT_DECLARE
  2. FT_DECLARE
  3. FT_DECLARE
  4. FT_DECLARE
  5. FT_DECLARE
  6. FT_DECLARE
  7. FT_DECLARE
  8. FT_DECLARE
  9. FT_DECLARE
  10. FT_DECLARE
  11. FT_DECLARE
  12. FT_DECLARE
  13. FT_DECLARE

   1 /*
   2  * Copyright (c) 2007, Anthony Minessale II
   3  * All rights reserved.
   4  * 
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 
   9  * * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  * 
  12  * * Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  * 
  16  * * Neither the name of the original author; nor the names of any contributors
  17  * may be used to endorse or promote products derived from this software
  18  * without specific prior written permission.
  19  * 
  20  * 
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
  25  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 
  34 #include "private/ftdm_core.h"
  35 #include "ftdm_buffer.h"
  36 
  37 static unsigned buffer_id = 0;
  38 
  39 struct ftdm_buffer {
  40         unsigned char *data;
  41         unsigned char *head;
  42         ftdm_size_t used;
  43         ftdm_size_t actually_used;
  44         ftdm_size_t datalen;
  45         ftdm_size_t max_len;
  46         ftdm_size_t blocksize;
  47         unsigned id;
  48         int loops;
  49 };
  50 
  51 
  52 FT_DECLARE(ftdm_status_t) ftdm_buffer_create(ftdm_buffer_t **buffer, ftdm_size_t blocksize, ftdm_size_t start_len, ftdm_size_t max_len)
  53 {
  54         ftdm_buffer_t *new_buffer;
  55 
  56         new_buffer = ftdm_malloc(sizeof(*new_buffer));
  57         if (new_buffer) {
  58                 memset(new_buffer, 0, sizeof(*new_buffer));
  59 
  60                 if (start_len) {
  61                         new_buffer->data = ftdm_malloc(start_len);
  62                         if (!new_buffer->data) {
  63                                 ftdm_safe_free(new_buffer);
  64                                 return FTDM_MEMERR;
  65                         }
  66                         memset(new_buffer->data, 0, start_len);
  67                 }
  68 
  69                 new_buffer->max_len = max_len;
  70                 new_buffer->datalen = start_len;
  71                 new_buffer->id = buffer_id++;
  72                 new_buffer->blocksize = blocksize;
  73                 new_buffer->head = new_buffer->data;
  74 
  75                 *buffer = new_buffer;
  76                 return FTDM_SUCCESS;
  77         }
  78 
  79         return FTDM_MEMERR;
  80 }
  81 
  82 FT_DECLARE(ftdm_size_t) ftdm_buffer_len(ftdm_buffer_t *buffer)
  83 {
  84 
  85         assert(buffer != NULL);
  86 
  87         return buffer->datalen;
  88 
  89 }
  90 
  91 
  92 FT_DECLARE(ftdm_size_t) ftdm_buffer_freespace(ftdm_buffer_t *buffer)
  93 {
  94         assert(buffer != NULL);
  95 
  96 
  97         if (buffer->max_len) {
  98                 return (ftdm_size_t) (buffer->max_len - buffer->used);
  99         }
 100         return 1000000;
 101 
 102 }
 103 
 104 FT_DECLARE(ftdm_size_t) ftdm_buffer_inuse(ftdm_buffer_t *buffer)
 105 {
 106         assert(buffer != NULL);
 107 
 108         return buffer->used;
 109 }
 110 
 111 FT_DECLARE(ftdm_size_t) ftdm_buffer_seek(ftdm_buffer_t *buffer, ftdm_size_t datalen)
 112 {
 113         ftdm_size_t reading = 0;
 114 
 115         assert(buffer != NULL);
 116 
 117         if (buffer->used < 1) {
 118                 buffer->used = 0;
 119                 return 0;
 120         } else if (buffer->used >= datalen) {
 121                 reading = datalen;
 122         } else {
 123                 reading = buffer->used;
 124         }
 125 
 126         buffer->used = buffer->actually_used - reading;
 127         buffer->head = buffer->data + reading;
 128 
 129         return reading;
 130 }
 131 
 132 FT_DECLARE(ftdm_size_t) ftdm_buffer_toss(ftdm_buffer_t *buffer, ftdm_size_t datalen)
 133 {
 134         ftdm_size_t reading = 0;
 135 
 136         assert(buffer != NULL);
 137 
 138         if (buffer->used < 1) {
 139                 buffer->used = 0;
 140                 return 0;
 141         } else if (buffer->used >= datalen) {
 142                 reading = datalen;
 143         } else {
 144                 reading = buffer->used;
 145         }
 146 
 147         buffer->used -= reading;
 148         buffer->head += reading;
 149 
 150         return buffer->used;
 151 }
 152 
 153 FT_DECLARE(void) ftdm_buffer_set_loops(ftdm_buffer_t *buffer, int loops)
 154 {
 155         buffer->loops = loops;
 156 }
 157 
 158 FT_DECLARE(ftdm_size_t) ftdm_buffer_read_loop(ftdm_buffer_t *buffer, void *data, ftdm_size_t datalen)
 159 {
 160         ftdm_size_t len;
 161         if ((len = ftdm_buffer_read(buffer, data, datalen)) < datalen) {
 162                 if (buffer->loops == 0) {
 163                         return len;
 164                 }
 165                 buffer->head = buffer->data;
 166                 buffer->used = buffer->actually_used;
 167                 len = ftdm_buffer_read(buffer, (char*)data + len, datalen - len);
 168                 buffer->loops--;
 169         }
 170         return len;
 171 }
 172 
 173 FT_DECLARE(ftdm_size_t) ftdm_buffer_read(ftdm_buffer_t *buffer, void *data, ftdm_size_t datalen)
 174 {
 175         ftdm_size_t reading = 0;
 176 
 177         assert(buffer != NULL);
 178         assert(data != NULL);
 179 
 180 
 181         if (buffer->used < 1) {
 182                 buffer->used = 0;
 183                 return 0;
 184         } else if (buffer->used >= datalen) {
 185                 reading = datalen;
 186         } else {
 187                 reading = buffer->used;
 188         }
 189 
 190         memcpy(data, buffer->head, reading);
 191         buffer->used -= reading;
 192         buffer->head += reading;
 193 
 194         /* if (buffer->id == 4) printf("%u o %d = %d\n", buffer->id, (unsigned)reading, (unsigned)buffer->used); */
 195         return reading;
 196 }
 197 
 198 FT_DECLARE(ftdm_size_t) ftdm_buffer_write(ftdm_buffer_t *buffer, const void *data, ftdm_size_t datalen)
 199 {
 200         ftdm_size_t freespace, actual_freespace;
 201 
 202         assert(buffer != NULL);
 203         assert(data != NULL);
 204         assert(buffer->data != NULL);
 205 
 206         if (!datalen) {
 207                 return buffer->used;
 208         }
 209 
 210         actual_freespace = buffer->datalen - buffer->actually_used;
 211         if (actual_freespace < datalen && (!buffer->max_len || (buffer->used + datalen <= buffer->max_len))) {
 212                 memmove(buffer->data, buffer->head, buffer->used);
 213                 buffer->head = buffer->data;
 214                 buffer->actually_used = buffer->used;
 215         }
 216 
 217         freespace = buffer->datalen - buffer->used;
 218 
 219         /*
 220           if (buffer->data != buffer->head) {
 221           memmove(buffer->data, buffer->head, buffer->used);
 222           buffer->head = buffer->data;
 223           }
 224         */
 225         
 226         if (freespace < datalen) {
 227                 ftdm_size_t new_size, new_block_size;
 228                 void *data;
 229                 
 230                 new_size = buffer->datalen + datalen;
 231                 new_block_size = buffer->datalen + buffer->blocksize;
 232 
 233                 if (new_block_size > new_size) {
 234                         new_size = new_block_size;
 235                 }
 236                 buffer->head = buffer->data;
 237                 data = realloc(buffer->data, new_size);
 238                 if (!data) {
 239                         return 0;
 240                 }
 241                 buffer->data = data;
 242                 buffer->head = buffer->data;
 243                 buffer->datalen = new_size;
 244         }
 245         
 246 
 247         freespace = buffer->datalen - buffer->used;
 248 
 249         if (freespace < datalen) {
 250                 return 0;
 251         } else {
 252                 memcpy(buffer->head + buffer->used, data, datalen);
 253                 buffer->used += datalen;
 254                 buffer->actually_used += datalen;
 255         }
 256         /* if (buffer->id == 4) printf("%u i %d = %d\n", buffer->id, (unsigned)datalen, (unsigned)buffer->used); */
 257 
 258         return buffer->used;
 259 }
 260 
 261 FT_DECLARE(void) ftdm_buffer_zero(ftdm_buffer_t *buffer)
 262 {
 263         assert(buffer != NULL);
 264         assert(buffer->data != NULL);
 265 
 266         buffer->used = 0;
 267         buffer->actually_used = 0;
 268         buffer->head = buffer->data;
 269 }
 270 
 271 FT_DECLARE(ftdm_size_t) ftdm_buffer_zwrite(ftdm_buffer_t *buffer, const void *data, ftdm_size_t datalen)
 272 {
 273         ftdm_size_t w;
 274         
 275         if (!(w = ftdm_buffer_write(buffer, data, datalen))) {
 276                 ftdm_buffer_zero(buffer);
 277                 return ftdm_buffer_write(buffer, data, datalen);
 278         }
 279 
 280         return w;
 281 }
 282 
 283 FT_DECLARE(void) ftdm_buffer_destroy(ftdm_buffer_t **buffer)
 284 {
 285         if (*buffer) {
 286                 ftdm_safe_free((*buffer)->data);
 287                 ftdm_safe_free(*buffer);
 288         }
 289 
 290         *buffer = NULL;
 291 }
 292 
 293 /* For Emacs:
 294  * Local Variables:
 295  * mode:c
 296  * indent-tabs-mode:t
 297  * tab-width:4
 298  * c-basic-offset:4
 299  * End:
 300  * For VIM:
 301  * vim:set softtabstop=4 shiftwidth=4 tabstop=4:
 302  */

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