1 /* Copyright (C) 2010-2020 The RetroArch team
3 * ---------------------------------------------------------------------------------------
4 * The following license statement only applies to this file (fifo_queue.c).
5 * ---------------------------------------------------------------------------------------
7 * Permission is hereby granted, free of charge,
8 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
11 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
16 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
19 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include <retro_common_api.h>
27 #include <retro_inline.h>
30 #include <queues/fifo_queue.h>
32 static bool fifo_initialize_internal(fifo_buffer_t *buf, size_t size)
34 uint8_t *buffer = (uint8_t*)calloc(1, size + 1);
47 bool fifo_initialize(fifo_buffer_t *buf, size_t size)
51 return fifo_initialize_internal(buf, size);
54 void fifo_free(fifo_buffer_t *buffer)
63 bool fifo_deinitialize(fifo_buffer_t *buffer)
70 buffer->buffer = NULL;
78 fifo_buffer_t *fifo_new(size_t size)
80 fifo_buffer_t *buf = (fifo_buffer_t*)malloc(sizeof(*buf));
85 if (!fifo_initialize_internal(buf, size))
94 void fifo_write(fifo_buffer_t *buffer, const void *in_buf, size_t size)
96 size_t first_write = size;
97 size_t rest_write = 0;
99 if (buffer->end + size > buffer->size)
101 first_write = buffer->size - buffer->end;
102 rest_write = size - first_write;
105 memcpy(buffer->buffer + buffer->end, in_buf, first_write);
106 memcpy(buffer->buffer, (const uint8_t*)in_buf + first_write, rest_write);
108 buffer->end = (buffer->end + size) % buffer->size;
111 void fifo_read(fifo_buffer_t *buffer, void *in_buf, size_t size)
113 size_t first_read = size;
114 size_t rest_read = 0;
116 if (buffer->first + size > buffer->size)
118 first_read = buffer->size - buffer->first;
119 rest_read = size - first_read;
122 memcpy(in_buf, (const uint8_t*)buffer->buffer + buffer->first, first_read);
123 memcpy((uint8_t*)in_buf + first_read, buffer->buffer, rest_read);
125 buffer->first = (buffer->first + size) % buffer->size;