org.jetbrains.kotlin.metadata.jvm.deserialization.utfEncoding.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.metadata.jvm.deserialization
import java.util.*
// The maximum possible length of the byte array in the CONSTANT_Utf8_info structure in the bytecode, as per JVMS7 4.4.7
const val MAX_UTF8_INFO_LENGTH = 65535
const val UTF8_MODE_MARKER = 0.toChar()
fun bytesToStrings(bytes: ByteArray): Array {
val result = ArrayList(1)
val buffer = StringBuilder()
var bytesInBuffer = 0
buffer.append(UTF8_MODE_MARKER)
// Zeros effectively occupy two bytes because each 0x0 is converted to 0x80 0xc0 in Modified UTF-8, see JVMS7 4.4.7
bytesInBuffer += 2
for (b in bytes) {
val c = b.toInt() and 0xFF // 0 <= c <= 255
buffer.append(c.toChar())
if (b in 1..127) {
bytesInBuffer++
} else {
bytesInBuffer += 2
}
if (bytesInBuffer >= MAX_UTF8_INFO_LENGTH - 1) {
result.add(buffer.toString())
buffer.setLength(0)
bytesInBuffer = 0
}
}
if (!buffer.isEmpty()) {
result.add(buffer.toString())
}
return result.toTypedArray()
}
fun stringsToBytes(strings: Array): ByteArray {
val resultLength = strings.sumOf { it.length }
val result = ByteArray(resultLength)
var i = 0
for (s in strings) {
for (si in 0..s.length - 1) {
result[i++] = s[si].code.toByte()
}
}
assert(i == result.size) { "Should have reached the end" }
return result
}