Last change
on this file since 6099cac was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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100755
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File size:
922 bytes
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Rev | Line | |
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[3ae31e9] | 1 | /*
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| 2 | =============================================================================
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| 3 | bitrev.c -- bit reverse function
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| 4 | Version 1 -- 1987-03-24 -- D.N. Lynx Crowe
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| 5 | =============================================================================
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| 6 | */
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| 7 |
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| 8 | static int bitmask[] = {
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| 9 |
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| 10 | 0x0001, 0x0002, 0x0004, 0x0008,
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| 11 | 0x0010, 0x0020, 0x0040, 0x0080,
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| 12 | 0x0100, 0x0200, 0x0400, 0x0800,
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| 13 | 0x1000, 0x2000, 0x4000, 0x8000
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| 14 | };
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| 15 |
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| 16 | /*
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| 17 | =============================================================================
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| 18 | bitrev(bitsin, nbits) -- reverses the rightmost nbits of bitsin.
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| 19 |
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| 20 | Any bits to the left of the reversed bits in the result will be zeros.
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| 21 | =============================================================================
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| 22 | */
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| 23 |
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| 24 | int
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| 25 | bitrev(bitsin, nbits)
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| 26 | int bitsin, nbits;
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| 27 | {
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| 28 | int m, n;
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| 29 |
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| 30 | n = 0;
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| 31 |
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| 32 | for (m = 0; m < nbits; m++)
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| 33 | if (bitsin & bitmask[m])
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| 34 | n |= bitmask[nbits-1-m];
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| 35 |
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| 36 | return(n);
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| 37 | }
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| 38 |
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