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simplify CheckMinimalPush checks, add safety assert

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This commit is contained in:
Gregory Sanders 2017-12-14 14:04:47 -05:00
parent c66adb286a
commit 176db61474
1 changed files with 4 additions and 2 deletions
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6
src/script/interpreter.cpp
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@ -220,15 +220,17 @@ bool static CheckPubKeyEncoding(const valtype &vchPubKey, unsigned int flags, co
}
bool static CheckMinimalPush(const valtype& data, opcodetype opcode) {
// Excludes OP_1NEGATE, OP_1-16 since they are by definition minimal
assert(0 <= opcode && opcode <= OP_PUSHDATA4);
if (data.size() == 0) {
// Could have used OP_0.
return opcode == OP_0;
} else if (data.size() == 1 && data[0] >= 1 && data[0] <= 16) {
// Could have used OP_1 .. OP_16.
return opcode == OP_1 + (data[0] - 1);
return false;
} else if (data.size() == 1 && data[0] == 0x81) {
// Could have used OP_1NEGATE.
return opcode == OP_1NEGATE;
return false;
} else if (data.size() <= 75) {
// Could have used a direct push (opcode indicating number of bytes pushed + those bytes).
return opcode == data.size();