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stdscript: Add exported MaxDataCarrierSizeV0.

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This adds an exported constant for the maximum allowed size of version 0
nulldata scripts to be considered standard and makes use of it instead
of the one from txscript since the constant is eventually going to be
removed from txscript given it is purely a standardness construct as
opposed to a consensus rule.
This commit is contained in:
Dave Collins 2021-11-12 08:45:29 -06:00
parent 2cd3941f7b
commit 8bdccd19d1
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GPG Key ID: B8904D9D9C93D1F2
1 changed files with 10 additions and 3 deletions
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13
internal/staging/stdscript/scriptv0.go
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@ -11,6 +11,13 @@ import (
"github.com/decred/dcrd/txscript/v4"
)
const (
// MaxDataCarrierSizeV0 is the maximum number of bytes allowed in pushed
// data to be considered a standard version 0 provably pruneable nulldata
// script.
MaxDataCarrierSizeV0 = 256
)
// ExtractCompressedPubKeyV0 extracts a compressed public key from the passed
// script if it is a standard version 0 pay-to-compressed-secp256k1-pubkey
// script. It will return nil otherwise.
@ -408,7 +415,7 @@ func IsNullDataScriptV0(script []byte) bool {
// OP_RETURN <optional data>
//
// Thus, it can either be a single OP_RETURN or an OP_RETURN followed by a
// canonical data push up to MaxDataCarrierSize bytes.
// canonical data push up to MaxDataCarrierSizeV0 bytes.
// The script can't possibly be a null data script if it doesn't start
// with OP_RETURN. Fail fast to avoid more work below.
@ -421,12 +428,12 @@ func IsNullDataScriptV0(script []byte) bool {
return true
}
// OP_RETURN followed by a canonical data push up to MaxDataCarrierSize
// OP_RETURN followed by a canonical data push up to MaxDataCarrierSizeV0
// bytes in length.
const scriptVersion = 0
tokenizer := txscript.MakeScriptTokenizer(scriptVersion, script[1:])
return tokenizer.Next() && tokenizer.Done() &&
len(tokenizer.Data()) <= txscript.MaxDataCarrierSize &&
len(tokenizer.Data()) <= MaxDataCarrierSizeV0 &&
isCanonicalPushV0(tokenizer.Opcode(), tokenizer.Data())
}