1 /*****************************************************************************/
5 /* Single bit operations */
9 /* (C) 1998 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
40 /*****************************************************************************/
42 /*****************************************************************************/
46 unsigned BitFind (unsigned long Val)
47 /* Find the first bit that is set in Val. Val must *not* be zero */
52 /* Search for the bits */
66 void BitSet (void* Data, unsigned Bit)
67 /* Set a bit in a char array */
69 /* Make a char pointer */
70 unsigned char* D = Data;
73 D [Bit / 8] |= 0x01 << (Bit % 8);
78 void BitReset (void* Data, unsigned Bit)
79 /* Reset a bit in a char array */
81 /* Make a char pointer */
82 unsigned char* D = Data;
85 D [Bit / 8] &= ~(0x01 << (Bit % 8));
90 int BitIsSet (void* Data, unsigned Bit)
91 /* Check if a bit is set in a char array */
93 /* Make a char pointer */
94 unsigned char* D = Data;
96 /* Check the bit state */
97 return (D [Bit / 8] & (0x01 << (Bit % 8))) != 0;
102 int BitIsReset (void* Data, unsigned Bit)
103 /* Check if a bit is reset in a char array */
105 /* Make a char pointer */
106 unsigned char* D = Data;
108 /* Check the bit state */
109 return (D [Bit / 8] & (0x01 << (Bit % 8))) == 0;
114 void BitMerge (void* Target, const void* Source, unsigned Size)
115 /* Merge the bits of two char arrays (that is, do an or for the full array) */
117 /* Make char arrays */
118 unsigned char* T = Target;
119 const unsigned char* S = Source;
121 /* Merge the arrays */