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Correct amount serialization comments

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Rome Reginelli
2018-11-26 20:03:18 -08:00
committed by Nik Bougalis
parent 412a3ec710
commit e0515b0015
1 changed files with 14 additions and 4 deletions
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18
src/ripple/protocol/impl/STAmount.cpp
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@@ -623,12 +623,22 @@ STAmount::isEquivalent (const STBase& t) const
//------------------------------------------------------------------------------
// amount = value * [10 ^ offset]
// amount = mValue * [10 ^ mOffset]
// Representation range is 10^80 - 10^(-80).
// On the wire, high 8 bits are (offset+142), low 56 bits are value.
//
// On the wire:
// - high bit is 0 for XRP, 1 for issued currency
// - next bit is 1 for positive, 0 for negative (except 0 issued currency, which
// is a special case of 0x8000000000000000
// - for issued currencies, the next 8 bits are (mOffset+97).
// The +97 is so that this value is always positive.
// - The remaining bits are significant digits (mantissa)
// That's 54 bits for issued currency and 62 bits for native
// (but XRP only needs 57 bits for the max value of 10^17 drops)
//
// Value is zero if amount is zero, otherwise value is 10^15 to (10^16 - 1)
// inclusive.
// mValue is zero if the amount is zero, otherwise it's within the range
// 10^15 to (10^16 - 1) inclusive.
// mOffset is in the range -96 to +80.
void STAmount::canonicalize ()
{
if (isXRP (*this))