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Mar 5th, 2008, 9:46 AM
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#1 |
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Hobbyist Programmer
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Location: Lebanon
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String of bits to byte[]
how can i convert a string of bit String S = "01010101010101010101"
into a byte b[] dont worry about left over bits.. assume that the size of S is a multiple of 8-bits |
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Mar 5th, 2008, 10:07 AM
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#2 |
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Programming Guru
 
Join Date: Apr 2005
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Re: String of bits to byte[]
Start with a byte of 0. Traverse each character from left to right, shifting the byte left with
<< 1. Each time you encounter a bit that's 1, set the first bit with | 1.Do this for each grouping of 8 bits to get your byte[]. For example, given the string "01010101010101010101": Byte Operation String During Iteration -------------------------------------------------- 0 (Shift << 1) 01010101010101010101 0 (Don't Set ) 0 (Shift << 1) 1010101010101010101 1 (Set | 1) 10 (Shift << 1) 010101010101010101 10 (Don't Set ) 100 (Shift << 1) 10101010101010101 101 (Set | 1) 1010 (Shift << 1) 0101010101010101 1010 (Don't Set ) 10100 (Shift << 1) 101010101010101 10101 (Set | 1) Etc etc ... |
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