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Implement ABI encoding for string #322

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Merged
abdrasulov merged 1 commit into from
Jun 2, 2025
Merged

Implement ABI encoding for string #322

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19 changes: 19 additions & 0 deletions ethereumkit/src/main/java/io/horizontalsystems/ethereumkit/contracts/ContractMethodHelper.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,11 @@ object ContractMethodHelper {
data += pad(unsignedBigIntergerToByteArray(BigInteger.valueOf(arguments.size * 32L + arraysData.size)))
arraysData += pad(BigInteger.valueOf(argument.size.toLong()).toByteArray()) + argument
}
is String -> {
data += pad(unsignedBigIntergerToByteArray(BigInteger.valueOf(arguments.size * 32L + arraysData.size)))
arraysData += encode(argument)
}
else -> throw IllegalArgumentException("encoding for $argument")
}
}
return data + arraysData
Expand Down Expand Up @@ -149,4 +154,18 @@ object ContractMethodHelper {
}
return data
}

fun encode(string: String): ByteArray {
val stringData = string.toByteArray(Charsets.UTF_8)
val count = stringData.size

var res = pad(byteArrayOf(count.toByte())) + stringData

val remainder = count % 32
if (remainder > 0) {
res += ByteArray(32 - remainder)
}

return res
}
}