| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (fifo_queue.h). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 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: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 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. |
| 21 | */ |
| 22 | |
| 23 | #ifndef __LIBRETRO_SDK_FIFO_BUFFER_H |
| 24 | #define __LIBRETRO_SDK_FIFO_BUFFER_H |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | #include <stddef.h> |
| 28 | #include <stdlib.h> |
| 29 | |
| 30 | #include <retro_common_api.h> |
| 31 | #include <retro_inline.h> |
| 32 | #include <boolean.h> |
| 33 | |
| 34 | RETRO_BEGIN_DECLS |
| 35 | |
| 36 | #define FIFO_READ_AVAIL(buffer) (((buffer)->end + (((buffer)->end < (buffer)->first) ? (buffer)->size : 0)) - (buffer)->first) |
| 37 | |
| 38 | #define FIFO_WRITE_AVAIL(buffer) (((buffer)->size - 1) - (((buffer)->end + (((buffer)->end < (buffer)->first) ? (buffer)->size : 0)) - (buffer)->first)) |
| 39 | |
| 40 | #define FIFO_READ_AVAIL_NONPTR(buffer) (((buffer).end + (((buffer).end < (buffer).first) ? (buffer).size : 0)) - (buffer).first) |
| 41 | |
| 42 | #define FIFO_WRITE_AVAIL_NONPTR(buffer) (((buffer).size - 1) - (((buffer).end + (((buffer).end < (buffer).first) ? (buffer).size : 0)) - (buffer).first)) |
| 43 | |
| 44 | struct fifo_buffer |
| 45 | { |
| 46 | uint8_t *buffer; |
| 47 | size_t size; |
| 48 | size_t first; |
| 49 | size_t end; |
| 50 | }; |
| 51 | |
| 52 | typedef struct fifo_buffer fifo_buffer_t; |
| 53 | |
| 54 | fifo_buffer_t *fifo_new(size_t size); |
| 55 | |
| 56 | bool fifo_initialize(fifo_buffer_t *buf, size_t size); |
| 57 | |
| 58 | static INLINE void fifo_clear(fifo_buffer_t *buffer) |
| 59 | { |
| 60 | buffer->first = 0; |
| 61 | buffer->end = 0; |
| 62 | } |
| 63 | |
| 64 | void fifo_write(fifo_buffer_t *buffer, const void *in_buf, size_t size); |
| 65 | |
| 66 | void fifo_read(fifo_buffer_t *buffer, void *in_buf, size_t size); |
| 67 | |
| 68 | void fifo_free(fifo_buffer_t *buffer); |
| 69 | |
| 70 | bool fifo_deinitialize(fifo_buffer_t *buffer); |
| 71 | |
| 72 | |
| 73 | RETRO_END_DECLS |
| 74 | |
| 75 | #endif |