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Improve CScriptNum() comment
Edited-by: Pieter Wuille <pieter.wuille@gmail.com>
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@ -197,8 +197,23 @@ public:
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if (vch.size() > nMaxNumSize) {
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throw scriptnum_error("script number overflow");
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}
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if (fRequireMinimal && vch.size() > 0 && (vch.back() & 0x7f) == 0 && (vch.size() <= 1 || (vch[vch.size() - 2] & 0x80) == 0)) {
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throw scriptnum_error("non-minimally encoded script number");
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if (fRequireMinimal && vch.size() > 0) {
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// Check that the number is encoded with the minimum possible
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// number of bytes.
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//
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// If the most-significant-byte - excluding the sign bit - is zero
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// then we're not minimal. Note how this test also rejects the
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// negative-zero encoding, 0x80.
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if ((vch.back() & 0x7f) == 0) {
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// One exception: if there's more than one byte and the most
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// significant bit of the second-most-significant-byte is set
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// it would conflict with the sign bit. An example of this case
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// is +-255, which encode to 0xff00 and 0xff80 respectively.
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// (big-endian).
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if (vch.size() <= 1 || (vch[vch.size() - 2] & 0x80) == 0) {
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throw scriptnum_error("non-minimally encoded script number");
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}
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}
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}
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m_value = set_vch(vch);
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}
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