| 1 | /* Copyright (C) 2005-2009 Mathieu Desnoyers |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public |
| 5 | * License as published by the Free Software Foundation; either |
| 6 | * version 2.1 of the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #ifndef UST_BUFFER_H |
| 19 | #define UST_BUFFER_H |
| 20 | |
| 21 | /* Buffer offset macros */ |
| 22 | |
| 23 | /* |
| 24 | * BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of |
| 25 | * the offset, which leaves only the buffer number. |
| 26 | */ |
| 27 | #define BUFFER_TRUNC(offset, chan) \ |
| 28 | ((offset) & (~((chan)->alloc_size-1))) |
| 29 | #define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->alloc_size - 1)) |
| 30 | #define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->subbuf_size - 1)) |
| 31 | #define SUBBUF_ALIGN(offset, chan) \ |
| 32 | (((offset) + (chan)->subbuf_size) & (~((chan)->subbuf_size - 1))) |
| 33 | #define SUBBUF_TRUNC(offset, chan) \ |
| 34 | ((offset) & (~((chan)->subbuf_size - 1))) |
| 35 | #define SUBBUF_INDEX(offset, chan) \ |
| 36 | (BUFFER_OFFSET((offset), chan) >> (chan)->subbuf_size_order) |
| 37 | |
| 38 | |
| 39 | #endif /* UST_BUFFER_H */ |