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How can I convert a string number to a number in Perl?

PHP - How do I convert a 6byte string storing a 48bit floating point to a number in PHP?

  • AMOS supports a 48-bit floating point format consisting of a 40-bit mantissa, 8-bit exponent, and a signbit. Because a normalized mantissa always starts with a binary one in the high-order bit, this bit is not stored in the floating point number but is always assumed to be present. This allows us to represent the 40-bit mantissa in only 39 bits.

  • Answer:

    Try this: $number = unpack('f', $six_byte_string); For more information, see: http://www.php.net/unpack

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You probably need to convert it to an IEEE 64-bit floating point (double) by bit-shifting. I don't know how you do this in PHP - if you discover it isn't possible you can write an external program (e.g. in C) to do the conversion for you. Populate a stream with the bits of the 6-byte string, inserting the required bits to pad it to a 64-bit float. Then read in the stream to a double as if you were reading it from a new file.

Marc

sorry

taketwo

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