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Diffstat (limited to 'lib/libavtp/src/util.h')
-rw-r--r-- | lib/libavtp/src/util.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/libavtp/src/util.h b/lib/libavtp/src/util.h new file mode 100644 index 00000000..2a6ec3b0 --- /dev/null +++ b/lib/libavtp/src/util.h @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2017, Intel Corporation + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Intel Corporation nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#pragma once + +#define BIT(n) (1UL << n) + +#define BITMASK(len) (BIT(len) - 1) + +/* Get value from the bits within 'bitmap' represented by 'mask'. The 'mask' + * parameter must be a continuous bit mask (e.g. 0b00111000). This macro + * doesn't work with non-continuous bit masks (e.g. 0b00101001). + */ +#define BITMAP_GET_VALUE(bitmap, mask, shift) \ + ((bitmap & mask) >> shift) + +/* Set the value 'val' in the 'bitmap' variable at the position represented by + * 'mask'. + */ +#define BITMAP_SET_VALUE(bitmap, val, mask, shift) \ + (bitmap = (bitmap & ~mask) | ((val << shift) & mask)) |