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Mapping from Hex to Binary

 
Nathan Heimdall
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Hello All,

I have created an implementation of the BigInteger class, which has the option of using numbers input in any base.
I am having problems getting it to scale up for large numbers as I am first converting the input hexadecimal string, character by character into its binary equivalent string.
i.e. 0-0000,1-0001,2-0010 and so on.

This conversion is taking a lot of time because when I input a hex number of 600+ bits it has to match every option until the hex character macthes.

What would be an efficient way to perform this mapping? Is there any Java API or a data structure that I can use to make this process faster?

Thanks,
 
Campbell Ritchie
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It should be very easy to convert hex numbers to binary. There is a direct mapping from each hex digit to 4 binary digits.
 
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