SizeEstimation::estimateInputsSize() - Code Metrics - Inspection of "WIP" - blocktrail/blocktrail-sdk-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#118)

by Ruben de

created 2018-04-19 15:39 UTC

SizeEstimation::estimateInputsSize() B

↳ Parent: SizeEstimation

Complexity

Conditions	5
Paths	6

Size

Total Lines	19
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	13
CRAP Score	5

Importance

Changes

Metric	Value
cc	5
eloc	13
nc	6
nop	2
dl	0
loc	19
ccs	13
cts	13
cp	1
crap	5
rs	8.8571
c	0
b	0
f	0

<?php

namespace Blocktrail\SDK;

use BitWasp\Bitcoin\Script\ScriptFactory;
use BitWasp\Bitcoin\Script\ScriptType;
use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface;
use \BitWasp\Bitcoin\Script\ScriptInfo\Multisig;
use \BitWasp\Bitcoin\Script\ScriptInfo\PayToPubKey;
use \BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
use BitWasp\Bitcoin\Script\ScriptInterface;
use BitWasp\Bitcoin\Transaction\TransactionOutputInterface;

class SizeEstimation
{
    const SIZE_DER_SIGNATURE = 72;
    const SIZE_V0_P2WSH = 36;

    /**
     * @param bool $compressed
     * @return int
     */
    public static function getPublicKeySize($compressed = true) {
        return $compressed ? PublicKeyInterface::LENGTH_COMPRESSED : PublicKeyInterface::LENGTH_UNCOMPRESSED;
    }

    /**
     * @param int $length
     * @return int
     */
    public static function getLengthOfScriptLengthElement($length) {
        if ($length < 75) {
            return 1;
        } else if ($length <= 0xff) {
            return 2;
        } else if ($length <= 0xffff) {
            return 3;
        } else if ($length <= 0xffffffff) {
            return 5;
        } else {
            throw new \RuntimeException('Size of pushdata too large');
        }
    }

    /**
     * @param int $length
     * @return int
     */
    public static function getLengthOfVarInt($length) {
        if ($length < 253) {
            return 1;
        } else if ($length < 65535) {
            $num_bytes = 2;
        } else if ($length < 4294967295) {
            $num_bytes = 4;
        } else if ($length < 18446744073709551615) {
            $num_bytes = 8;
        } else {
            throw new \InvalidArgumentException("Invalid decimal");
        }
        return 1 + $num_bytes;
    }

    /**
     * @param array $vectorSizes
     * @return int|mixed
     */
    public static function getLengthOfVector(array $vectorSizes) {
        $vectorSize = self::getLengthOfVarInt(count($vectorSizes));
        foreach ($vectorSizes as $size) {
            $vectorSize += self::getLengthOfVarInt($size) + $size;
        }
        return $vectorSize;
    }

    /**
     * @param Multisig $multisig
     * @return array - first is array of stack sizes, second is script len
     */
    public static function estimateMultisigStackSize(Multisig $multisig) {
        $stackSizes = [0];
        for ($i = 0; $i < $multisig->getRequiredSigCount(); $i++) {
            $stackSizes[] = self::SIZE_DER_SIGNATURE;
        }

        $scriptSize = 1; // OP_$m
        $keys = $multisig->getKeyBuffers();
        for ($i = 0, $n = $multisig->getKeyCount(); $i < $n; $i++) {
            $scriptSize += 1 + $keys[$i]->getSize();
        }

        $scriptSize += 1 + 1; // OP_$n OP_CHECKMULTISIG
        return [$stackSizes, $scriptSize];
    }

    /**
     * @param PayToPubKey $info
     * @return array - first is array of stack sizes, second is script len
     */
    public static function estimateP2PKStackSize(PayToPubKey $info) {
        $stackSizes = [self::SIZE_DER_SIGNATURE];

        $scriptSize = 1 + $info->getKeyBuffer()->getSize(); // PUSHDATA[<75] PUBLICKEY

        $scriptSize += 1; // OP_CHECKSIG
        return [$stackSizes, $scriptSize];
    }

    /**
     * @param bool $isCompressed
     * @return array - first is array of stack sizes, second is script len
     */
    public static function estimateP2PKHStackSize($isCompressed = true) {
        $pubKeySize = self::getPublicKeySize($isCompressed);
        $stackSizes = [self::SIZE_DER_SIGNATURE, $pubKeySize];

        $scriptSize = 1 + 1 + 1 + 20 + 1 + 1;
        return [$stackSizes, $scriptSize];
    }

    /**
     * @param array $stackSizes - array of integer size of a value (for scriptSig or witness)
     * @param bool $isWitness
     * @param ScriptInterface $redeemScript
     * @param ScriptInterface $witnessScript
     * @return array
     */
    public static function estimateSizeForStack(array $stackSizes, $isWitness, ScriptInterface $redeemScript = null, ScriptInterface $witnessScript = null) {
        assert(($witnessScript === null) || $isWitness);

        if ($isWitness) {
            $scriptSigSizes = [];
            $witnessSizes = $stackSizes;
            if ($witnessScript instanceof ScriptInterface) {
                $witnessSizes[] = $witnessScript->getBuffer()->getSize();
            }
        } else {
            $scriptSigSizes = $stackSizes;
            $witnessSizes = [];
        }

        if ($redeemScript instanceof ScriptInterface) {
            $scriptSigSizes[] = $redeemScript->getBuffer()->getSize();
        }

        $scriptSigSize = 0;
        foreach ($scriptSigSizes as $size) {
            $len = self::getLengthOfScriptLengthElement($size);
            $scriptSigSize += $len;
            $scriptSigSize += $size;
        }

        // Make sure to count the CScriptBase length prefix..
        $scriptSigSize += self::getLengthOfVarInt($scriptSigSize);

        // make sure this is set to 0 when not used.
        // Summing WitnessSize is used in addition to $withWitness
        // because a tx without witnesses _cannot_ use witness serialization
        // total witnessSize = 0 means don't use that format
        $witnessSize = 0;
        if (count($witnessSizes) > 0) {
            // witness has a prefix indicating `n` elements in vector
            $witnessSize = self::getLengthOfVector($witnessSizes);
        }
        return [$scriptSigSize, $witnessSize];
    }

    /**
     * @param ScriptInterface $script - not the scriptPubKey, might be SPK,RS,WS
     * @param ScriptInterface|null $redeemScript
     * @param ScriptInterface $witnessScript
     * @param bool $isWitness
     * @return array
     */
    public static function estimateInputFromScripts(ScriptInterface $script, ScriptInterface $redeemScript = null, ScriptInterface $witnessScript = null, $isWitness) {
        assert($witnessScript === null || $isWitness);
        $classifier = new OutputClassifier();
        if ($classifier->isMultisig($script)) {
            list ($stackSizes, ) = SizeEstimation::estimateMultisigStackSize(new Multisig($script));
        } else if ($classifier->isPayToPublicKey($script)) {
            list ($stackSizes, ) = SizeEstimation::estimateP2PKStackSize(new PayToPubKey($script));
        } else if ($classifier->isPayToPublicKeyHash($script)) {
            // defaults to compressed, tough luck
            list ($stackSizes, ) = SizeEstimation::estimateP2PKHStackSize();
        } else {
            throw new \InvalidArgumentException("Unsupported script type");
        }

        return self::estimateSizeForStack($stackSizes, $isWitness, $redeemScript, $witnessScript);
    }

    /**
     * @param UTXO $utxo
     * @return array
     */
    public static function estimateUtxo(UTXO $utxo) {
        return self::estimateUtxoFromScripts($utxo->scriptPubKey, $utxo->redeemScript, $utxo->witnessScript);
    }

    /**
     * @param ScriptInterface $scriptPubKey
     * @param ScriptInterface $redeemScript
     * @param ScriptInterface $witnessScript
     * @return array
     */
    public static function estimateUtxoFromScripts(
        ScriptInterface $scriptPubKey,
        ScriptInterface $redeemScript = null,
        ScriptInterface $witnessScript = null
    ) {
        $classifier = new OutputClassifier();
        $decodePK = $classifier->decode($scriptPubKey);
        $witness = false;
        if ($decodePK->getType() === ScriptType::P2SH) {
            if (null === $redeemScript) {
                throw new \RuntimeException("Can't estimate, missing redeem script");
            }
            $decodePK = $classifier->decode($redeemScript);
        }

        if ($decodePK->getType() === ScriptType::P2WKH) {
            $scriptSitu = ScriptFactory::scriptPubKey()->p2pkh($decodePK->getSolution());
            $decodePK = $classifier->decode($scriptSitu);
            $witness = true;
        } else if ($decodePK->getType() === ScriptType::P2WSH) {
            if (null === $witnessScript) {
                throw new \RuntimeException("Can't estimate, missing witness script");
            }
            $decodePK = $classifier->decode($witnessScript);
            $witness = true;
        }

        if (!in_array($decodePK->getType(), [ScriptType::MULTISIG, ScriptType::P2PKH, ScriptType::P2PK])) {
            throw new \RuntimeException("Unsupported script type");
        }

        $script = $decodePK->getScript();
        list ($scriptSig, $witness) = SizeEstimation::estimateInputFromScripts($script, $redeemScript, $witnessScript, $witness);

        return [
            "scriptSig" => $scriptSig,
            "witness" => $witness,
        ];
    }

    /**
     * @param UTXO[] $utxos
     * @param bool $withWitness
     * @return integer
     */
    public static function estimateInputsSize(array $utxos, $withWitness) {
        $inputSize = 0;
        $witnessSize = 0;
        foreach ($utxos as $utxo) {
            $estimate = SizeEstimation::estimateUtxo($utxo);
            $inputSize += 32 + 4 + 4;
            $inputSize += $estimate['scriptSig'];
            if ($withWitness) {
                $witnessSize += $estimate['witness'];
            }
        }

        if ($withWitness && $witnessSize != 0) {
            $inputSize += $witnessSize;
            $inputSize += 2; // flag bytes
        }

        return $inputSize;
    }

    /**
     * @param array $outputs
     * @return int
     */
    public static function estimateOutputsSize(array $outputs) {
        $outputSize = 0;
        foreach ($outputs as $output) {
            $size = 8;

            $scriptSize = null;
$myVar = 'Value';
$higher = false;

if (rand(1, 6) > 3) {
    $higher = true;
} else {
    $higher = false;
}
            if ($output instanceof TransactionOutputInterface) {
                $scriptSize = $output->getScript()->getBuffer()->getSize();
            } else {
                if (isset($output['scriptPubKey'])) {
                    if ($output['scriptPubKey'] instanceof ScriptInterface) {
                        $scriptSize = $output['scriptPubKey']->getBuffer()->getSize();
                    } else {
                        $scriptSize = strlen($output['scriptPubKey']) / 2;
                    }
                } else {
                    $scriptSize = 25;
                }
            }

            $size += SizeEstimation::getLengthOfVarInt($scriptSize) + $scriptSize;
            $outputSize += $size;
        }
        return $outputSize;
    }

    /**
     * @param UTXO[] $utxos
     * @param array $outputs
     * @return int
     */
    public static function estimateVsize(array $utxos, array $outputs) {
        return (int)ceil(self::estimateWeight($utxos, $outputs) / 4);
    }

    /**
     * @param UTXO[] $utxos
     * @param array $outputs
     * @return int
     */
    public static function estimateWeight(array $utxos, array $outputs) {
        $outputsSize = SizeEstimation::estimateOutputsSize($outputs);
        $outputsSize += SizeEstimation::getLengthOfVarInt(count($outputs));

        $baseSize = 4 +
            SizeEstimation::getLengthOfVarInt(count($utxos)) + SizeEstimation::estimateInputsSize($utxos, false) +
            $outputsSize + 4;

        $witnessSize = 4 +
            SizeEstimation::getLengthOfVarInt(count($utxos)) + SizeEstimation::estimateInputsSize($utxos, true) +
            $outputsSize + 4;

        return ($baseSize * 3) + $witnessSize;
    }
}


1		<?php
2
3		namespace Blocktrail\SDK;
4
5		use BitWasp\Bitcoin\Script\ScriptFactory;
6		use BitWasp\Bitcoin\Script\ScriptType;
7		use BitWasp\Bitcoin\Crypto\EcAdapter\Key\PublicKeyInterface;
8		use \BitWasp\Bitcoin\Script\ScriptInfo\Multisig;
9		use \BitWasp\Bitcoin\Script\ScriptInfo\PayToPubKey;
10		use \BitWasp\Bitcoin\Script\Classifier\OutputClassifier;
11		use BitWasp\Bitcoin\Script\ScriptInterface;
12		use BitWasp\Bitcoin\Transaction\TransactionOutputInterface;
13
14		class SizeEstimation
15		{
16		const SIZE_DER_SIGNATURE = 72;
17		const SIZE_V0_P2WSH = 36;
18
19		/**
20		* @param bool $compressed
21		* @return int
22		*/
23		public static function getPublicKeySize($compressed = true) {
24		return $compressed ? PublicKeyInterface::LENGTH_COMPRESSED : PublicKeyInterface::LENGTH_UNCOMPRESSED;
25		}
26
27		/**
28		* @param int $length
29		* @return int
30		*/
31	7	public static function getLengthOfScriptLengthElement($length) {
32	7	if ($length < 75) {
33	7	return 1;
34	6	} else if ($length <= 0xff) {
35	6	return 2;
36		} else if ($length <= 0xffff) {
37		return 3;
38		} else if ($length <= 0xffffffff) {
39		return 5;
40		} else {
41		throw new \RuntimeException('Size of pushdata too large');
42		}
43		}
44
45		/**
46		* @param int $length
47		* @return int
48		*/
49	7	public static function getLengthOfVarInt($length) {
50	7	if ($length < 253) {
51	7	return 1;
52	6	} else if ($length < 65535) {
53	6	$num_bytes = 2;
54		} else if ($length < 4294967295) {
55		$num_bytes = 4;
56		} else if ($length < 18446744073709551615) {
57		$num_bytes = 8;
58		} else {
59		throw new \InvalidArgumentException("Invalid decimal");
60		}
61	6	return 1 + $num_bytes;
62		}
63
64		/**
65		* @param array $vectorSizes
66		* @return int\|mixed
67		*/
68	2	public static function getLengthOfVector(array $vectorSizes) {
69	2	$vectorSize = self::getLengthOfVarInt(count($vectorSizes));
70	2	foreach ($vectorSizes as $size) {
71	2	$vectorSize += self::getLengthOfVarInt($size) + $size;
72		}
73	2	return $vectorSize;
74		}
75
76		/**
77		* @param Multisig $multisig
78		* @return array - first is array of stack sizes, second is script len
79		*/
80	7	public static function estimateMultisigStackSize(Multisig $multisig) {
81	7	$stackSizes = [0];
82	7	for ($i = 0; $i < $multisig->getRequiredSigCount(); $i++) {
83	7	$stackSizes[] = self::SIZE_DER_SIGNATURE;
84		}
85
86	7	$scriptSize = 1; // OP_$m
87	7	$keys = $multisig->getKeyBuffers();
88	7	for ($i = 0, $n = $multisig->getKeyCount(); $i < $n; $i++) {
89	7	$scriptSize += 1 + $keys[$i]->getSize();
90		}
91
92	7	$scriptSize += 1 + 1; // OP_$n OP_CHECKMULTISIG
93	7	return [$stackSizes, $scriptSize];
94		}
95
96		/**
97		* @param PayToPubKey $info
98		* @return array - first is array of stack sizes, second is script len
99		*/
100		public static function estimateP2PKStackSize(PayToPubKey $info) {
101		$stackSizes = [self::SIZE_DER_SIGNATURE];
102
103		$scriptSize = 1 + $info->getKeyBuffer()->getSize(); // PUSHDATA[<75] PUBLICKEY
		0 ignored issues – show Unused Code Comprehensibility introduced 2017-10-05 15:22 UTC by Report Bug Copy Issue Report `38%` of this comment could be valid code. Did you maybe forget this after debugging? Sometimes obsolete code just ends up commented out instead of removed. In this case it is better to remove the code once you have checked you do not need it. The code might also have been commented out for debugging purposes. In this case it is vital that someone uncomments it again or your project may behave in very unexpected ways in production. This check looks for comments that seem to be mostly valid code and reports them. Loading history...
104		$scriptSize += 1; // OP_CHECKSIG
105		return [$stackSizes, $scriptSize];
106		}
107
108		/**
109		* @param bool $isCompressed
110		* @return array - first is array of stack sizes, second is script len
111		*/
112		public static function estimateP2PKHStackSize($isCompressed = true) {
113		$pubKeySize = self::getPublicKeySize($isCompressed);
114		$stackSizes = [self::SIZE_DER_SIGNATURE, $pubKeySize];
115
116		$scriptSize = 1 + 1 + 1 + 20 + 1 + 1;
117		return [$stackSizes, $scriptSize];
118		}
119
120		/**
121		* @param array $stackSizes - array of integer size of a value (for scriptSig or witness)
122		* @param bool $isWitness
123		* @param ScriptInterface $redeemScript
124		* @param ScriptInterface $witnessScript
125		* @return array
126		*/
127	7	public static function estimateSizeForStack(array $stackSizes, $isWitness, ScriptInterface $redeemScript = null, ScriptInterface $witnessScript = null) {
128	7	assert(($witnessScript === null) \|\| $isWitness);
129
130	7	if ($isWitness) {
131	2	$scriptSigSizes = [];
132	2	$witnessSizes = $stackSizes;
133	2	if ($witnessScript instanceof ScriptInterface) {
134	2	$witnessSizes[] = $witnessScript->getBuffer()->getSize();
135		}
136		} else {
137	6	$scriptSigSizes = $stackSizes;
138	6	$witnessSizes = [];
139		}
140
141	7	if ($redeemScript instanceof ScriptInterface) {
142	7	$scriptSigSizes[] = $redeemScript->getBuffer()->getSize();
143		}
144
145	7	$scriptSigSize = 0;
146	7	foreach ($scriptSigSizes as $size) {
147	7	$len = self::getLengthOfScriptLengthElement($size);
148	7	$scriptSigSize += $len;
149	7	$scriptSigSize += $size;
150		}
151
152		// Make sure to count the CScriptBase length prefix..
153	7	$scriptSigSize += self::getLengthOfVarInt($scriptSigSize);
154
155		// make sure this is set to 0 when not used.
156		// Summing WitnessSize is used in addition to $withWitness
157		// because a tx without witnesses _cannot_ use witness serialization
158		// total witnessSize = 0 means don't use that format
159	7	$witnessSize = 0;
160	7	if (count($witnessSizes) > 0) {
161		// witness has a prefix indicating `n` elements in vector
162	2	$witnessSize = self::getLengthOfVector($witnessSizes);
163		}
164	7	return [$scriptSigSize, $witnessSize];
165		}
166
167		/**
168		* @param ScriptInterface $script - not the scriptPubKey, might be SPK,RS,WS
169		* @param ScriptInterface\|null $redeemScript
170		* @param ScriptInterface $witnessScript
171		* @param bool $isWitness
172		* @return array
173		*/
174	7	public static function estimateInputFromScripts(ScriptInterface $script, ScriptInterface $redeemScript = null, ScriptInterface $witnessScript = null, $isWitness) {
175	7	assert($witnessScript === null \|\| $isWitness);
176	7	$classifier = new OutputClassifier();
177	7	if ($classifier->isMultisig($script)) {
178	7	list ($stackSizes, ) = SizeEstimation::estimateMultisigStackSize(new Multisig($script));
179		} else if ($classifier->isPayToPublicKey($script)) {
180		list ($stackSizes, ) = SizeEstimation::estimateP2PKStackSize(new PayToPubKey($script));
181		} else if ($classifier->isPayToPublicKeyHash($script)) {
182		// defaults to compressed, tough luck
183		list ($stackSizes, ) = SizeEstimation::estimateP2PKHStackSize();
184		} else {
185		throw new \InvalidArgumentException("Unsupported script type");
186		}
187
188	7	return self::estimateSizeForStack($stackSizes, $isWitness, $redeemScript, $witnessScript);
189		}
190
191		/**
192		* @param UTXO $utxo
193		* @return array
194		*/
195	7	public static function estimateUtxo(UTXO $utxo) {
196	7	return self::estimateUtxoFromScripts($utxo->scriptPubKey, $utxo->redeemScript, $utxo->witnessScript);
197		}
198
199		/**
200		* @param ScriptInterface $scriptPubKey
201		* @param ScriptInterface $redeemScript
202		* @param ScriptInterface $witnessScript
203		* @return array
204		*/
205	7	public static function estimateUtxoFromScripts(
206		ScriptInterface $scriptPubKey,
207		ScriptInterface $redeemScript = null,
208		ScriptInterface $witnessScript = null
209		) {
210	7	$classifier = new OutputClassifier();
211	7	$decodePK = $classifier->decode($scriptPubKey);
212	7	$witness = false;
213	7	if ($decodePK->getType() === ScriptType::P2SH) {
214	7	if (null === $redeemScript) {
215		throw new \RuntimeException("Can't estimate, missing redeem script");
216		}
217	7	$decodePK = $classifier->decode($redeemScript);
218		}
219
220	7	if ($decodePK->getType() === ScriptType::P2WKH) {
221		$scriptSitu = ScriptFactory::scriptPubKey()->p2pkh($decodePK->getSolution());
222		$decodePK = $classifier->decode($scriptSitu);
223		$witness = true;
224	7	} else if ($decodePK->getType() === ScriptType::P2WSH) {
225	2	if (null === $witnessScript) {
226		throw new \RuntimeException("Can't estimate, missing witness script");
227		}
228	2	$decodePK = $classifier->decode($witnessScript);
229	2	$witness = true;
230		}
231
232	7	if (!in_array($decodePK->getType(), [ScriptType::MULTISIG, ScriptType::P2PKH, ScriptType::P2PK])) {
233		throw new \RuntimeException("Unsupported script type");
234		}
235
236	7	$script = $decodePK->getScript();
237	7	list ($scriptSig, $witness) = SizeEstimation::estimateInputFromScripts($script, $redeemScript, $witnessScript, $witness);
238
239		return [
240	7	"scriptSig" => $scriptSig,
241	7	"witness" => $witness,
242		];
243		}
244
245		/**
246		* @param UTXO[] $utxos
247		* @param bool $withWitness
248		* @return integer
249		*/
250	7	public static function estimateInputsSize(array $utxos, $withWitness) {
251	7	$inputSize = 0;
252	7	$witnessSize = 0;
253	7	foreach ($utxos as $utxo) {
254	7	$estimate = SizeEstimation::estimateUtxo($utxo);
255	7	$inputSize += 32 + 4 + 4;
256	7	$inputSize += $estimate['scriptSig'];
257	7	if ($withWitness) {
258	7	$witnessSize += $estimate['witness'];
259		}
260		}
261
262	7	if ($withWitness && $witnessSize != 0) {
263	2	$inputSize += $witnessSize;
264	2	$inputSize += 2; // flag bytes
265		}
266
267	7	return $inputSize;
268		}
269
270		/**
271		* @param array $outputs
272		* @return int
273		*/
274	7	public static function estimateOutputsSize(array $outputs) {
275	7	$outputSize = 0;
276	7	foreach ($outputs as $output) {
277	7	$size = 8;
278
279	7	$scriptSize = null;
		0 ignored issues – show Unused Code introduced 2018-01-03 13:29 UTC by Report Bug Copy Issue Report `$scriptSize` is not used, you could remove the assignment. This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently. $myVar = 'Value'; $higher = false; if (rand(1, 6) > 3) { $higher = true; } else { $higher = false; } Both the `$myVar` assignment in line 1 and the `$higher` assignment in line 2 are dead. The first because `$myVar` is never used and the second because `$higher` is always overwritten for every possible time line. Loading history...
280	7	if ($output instanceof TransactionOutputInterface) {
281		$scriptSize = $output->getScript()->getBuffer()->getSize();
282		} else {
283	7	if (isset($output['scriptPubKey'])) {
284	7	if ($output['scriptPubKey'] instanceof ScriptInterface) {
285	7	$scriptSize = $output['scriptPubKey']->getBuffer()->getSize();
286		} else {
287	7	$scriptSize = strlen($output['scriptPubKey']) / 2;
288		}
289		} else {
290	7	$scriptSize = 25;
291		}
292		}
293
294	7	$size += SizeEstimation::getLengthOfVarInt($scriptSize) + $scriptSize;
295	7	$outputSize += $size;
296		}
297	7	return $outputSize;
298		}
299
300		/**
301		* @param UTXO[] $utxos
302		* @param array $outputs
303		* @return int
304		*/
305	7	public static function estimateVsize(array $utxos, array $outputs) {
306	7	return (int)ceil(self::estimateWeight($utxos, $outputs) / 4);
307		}
308
309		/**
310		* @param UTXO[] $utxos
311		* @param array $outputs
312		* @return int
313		*/
314	7	public static function estimateWeight(array $utxos, array $outputs) {
315	7	$outputsSize = SizeEstimation::estimateOutputsSize($outputs);
316	7	$outputsSize += SizeEstimation::getLengthOfVarInt(count($outputs));
317
318		$baseSize = 4 +
319	7	SizeEstimation::getLengthOfVarInt(count($utxos)) + SizeEstimation::estimateInputsSize($utxos, false) +
320	7	$outputsSize + 4;
321
322		$witnessSize = 4 +
323	7	SizeEstimation::getLengthOfVarInt(count($utxos)) + SizeEstimation::estimateInputsSize($utxos, true) +
324	7	$outputsSize + 4;
325
326	7	return ($baseSize * 3) + $witnessSize;
327		}
328		}
329

blocktrail / blocktrail-sdk-php

Pull Request — master (#118)

SizeEstimation::estimateInputsSize() B

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