Created
September 14, 2013 00:09
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Quick binary rotation (rotl/rotr) in Python
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| def rotl(num, bits): | |
| bit = num & (1 << (bits-1)) | |
| num <<= 1 | |
| if(bit): | |
| num |= 1 | |
| num &= (2**bits-1) | |
| return num | |
| def rotr(num, bits): | |
| num &= (2**bits-1) | |
| bit = num & 1 | |
| num >>= 1 | |
| if(bit): | |
| num |= (1 << (bits-1)) | |
| return num | |
| print rotl(255,8); | |
| print rotr(255,8); | |
| numr=1; | |
| numl=1; | |
| for i in range(0,10): | |
| print "0x%02X (%d)" % (numr,numr) | |
| print "0x%02X (%d)" % (numl,numl) | |
| numr = rotr(numr,8) | |
| numl = rotl(numl,8) |
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You can change 2**x to 1<<x