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Merge pull request #41 from rsksmart/add-assertions-for-pegout-transa…
…ction-created-event Add assertions for pegout transaction created event
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| class VarInt { | ||
| constructor(value) { | ||
| if (typeof value === 'number' || typeof value === 'bigint') { | ||
| this.value = BigInt(value); | ||
| this.originallyEncodedSize = this.getSizeInBytes(); | ||
| } else if (Buffer.isBuffer(value)) { | ||
| this.value = this.decode(value); | ||
| this.originallyEncodedSize = this.getSizeInBytes(); | ||
| } else { | ||
| throw new Error('Invalid input: value should be a number or buffer'); | ||
| } | ||
| } | ||
|
|
||
| getOriginalSizeInBytes() { | ||
| return this.originallyEncodedSize; | ||
| } | ||
|
|
||
| getSizeInBytes() { | ||
| return VarInt.sizeOf(this.value); | ||
| } | ||
|
|
||
| static sizeOf(value) { | ||
| if (value < 0) return 9; | ||
| if (value < 253) return 1; | ||
| if (value <= 0xFFFF) return 3; | ||
| if (value <= 0xFFFFFFFF) return 5; | ||
| return 9; | ||
| } | ||
|
|
||
| encode() { | ||
| let bytes; | ||
| switch (this.getSizeInBytes()) { | ||
| case 1: | ||
| return Buffer.from([Number(this.value)]); | ||
| case 3: | ||
| return Buffer.from([253, Number(this.value & 0xFF), Number((this.value >> 8) & 0xFF)]); | ||
| case 5: | ||
| bytes = Buffer.alloc(5); | ||
| bytes[0] = 254; | ||
| bytes.writeUInt32LE(Number(this.value), 1); | ||
| return bytes; | ||
| case 9: | ||
| bytes = Buffer.alloc(9); | ||
| bytes[0] = 255; | ||
| bytes.writeBigUInt64LE(this.value, 1); | ||
| return bytes; | ||
| default: | ||
| throw new Error('Invalid size for encoding'); | ||
| } | ||
| } | ||
|
|
||
| decode(buffer) { | ||
| const first = buffer[0]; | ||
| if (first < 253) { | ||
| return BigInt(first); | ||
| } else if (first === 253) { | ||
| return BigInt(buffer.readUInt16LE(1)); | ||
| } else if (first === 254) { | ||
| return BigInt(buffer.readUInt32LE(1)); | ||
| } else { | ||
| return buffer.readBigUInt64LE(1); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| const decodeOutpointValues = (encodedUtxoOutpointValues) => { | ||
| let offset = 0; | ||
| let idx = 0; | ||
| const outpointValues = []; | ||
| while (encodedUtxoOutpointValues.length > offset) { | ||
| let utxoOutpointValue = new VarInt(encodedUtxoOutpointValues, offset); | ||
| outpointValues.push(utxoOutpointValue.value); | ||
| offset += utxoOutpointValue.getSizeInBytes(); | ||
| idx++; | ||
| } | ||
| return outpointValues; | ||
| } | ||
|
|
||
| const encodeOutpointValuesAsMap = (utxos) => { | ||
| return utxos.reduce((map, utxo) => { | ||
| map[utxo.valueInSatoshis] = Buffer.from(new VarInt(utxo.valueInSatoshis).encode()).toString("hex"); | ||
| return map; | ||
| }, {}); | ||
| } | ||
|
|
||
| module.exports = { VarInt, decodeOutpointValues, encodeOutpointValuesAsMap }; |
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