The open source OpenXR runtime
u/bitwise: Add bitwise manipulator functions
authored by
Pete Black
and committed by
Ryan Pavlik
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src/xrt/auxiliary/CMakeLists.txt
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src/xrt/auxiliary/CMakeLists.txt
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# Copyright 2019, Collabora, Ltd.
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# Copyright 2019-2020, Collabora, Ltd.
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# SPDX-License-Identifier: BSL-1.0
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set(MATH_SOURCE_FILES
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endif()
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set(UTIL_SOURCE_FILES
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util/u_bitwise.c
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util/u_bitwise.h
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util/u_misc.c
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util/u_misc.h
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util/u_debug.c
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src/xrt/auxiliary/meson.build
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src/xrt/auxiliary/meson.build
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# Copyright 2019, Collabora, Ltd.
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# Copyright 2019-2020, Collabora, Ltd.
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# SPDX-License-Identifier: BSL-1.0
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aux_include = include_directories('.')
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lib_aux_util = static_library(
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'aux_util',
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files(
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'util/u_misc.c',
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'util/u_misc.h',
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'util/u_bitwise.c',
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'util/u_bitwise.h',
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'util/u_debug.c',
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'util/u_debug.h',
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'util/u_device.c',
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'util/u_hashset.h',
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'util/u_json.c',
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'util/u_json.h',
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'util/u_misc.c',
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'util/u_misc.h',
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'util/u_sink.h',
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'util/u_sink_converter.c',
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'util/u_sink_deinterleaver.c',
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src/xrt/auxiliary/util/u_bitwise.c
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src/xrt/auxiliary/util/u_bitwise.c
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// Copyright 2019-2020, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief Functions for manipulating tightly packed data as bits.
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* @author Jakob Bornecrantz <jakob@collabora.com>
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* @author Pete Black <pete.black@collabora.com>
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* @ingroup aux_util
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*/
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#include <stdio.h>
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#include "util/u_bitwise.h"
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int
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get_bit(unsigned char *b, int num)
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{
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int index = num / 8;
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return (b[index] >> (7 - (num % 8))) & 1;
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}
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int
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get_bits(unsigned char *b, int start, int num)
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{
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int ret = 0;
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for (int i = 0; i < num; i++) {
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ret <<= 1;
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ret |= get_bit(b, start + i);
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}
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return ret;
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}
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int
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sign_extend_13(unsigned int i)
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{
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return ((int)(i << 19)) >> 19;
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}
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src/xrt/auxiliary/util/u_bitwise.h
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src/xrt/auxiliary/util/u_bitwise.h
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// Copyright 2019-2020, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief Functions for manipulating tightly packed data as bits.
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* @author Jakob Bornecrantz <jakob@collabora.com>
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* @author Pete Black <pete.black@collabora.com>
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* @ingroup aux_util
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*/
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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int
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get_bit(unsigned char *b, int num);
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int
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get_bits(unsigned char *b, int start, int num);
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int
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sign_extend_13(unsigned int i);
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#ifdef __cplusplus
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}
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#endif