commonMain.ru.casperix.spine.binary.BinarySkeletonBuffer.kt Maven / Gradle / Ivy

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package ru.casperix.spine.binary

import ru.casperix.math.color.Color
import ru.casperix.math.color.ColorCode

class BinarySkeletonBuffer(val source: UByteArray) {
    private var readIndex = 0

    fun readByte(): Int {
        return source[readIndex++].toInt()
    }

    fun readByteToLong(): Long {
        return source[readIndex++].toLong()
    }

    fun readShort(): Int {
        return readByte() shl 8 or readByte()
    }

    fun readInt(): Int {
        return readByte() shl 24 or (readByte() shl 16) or (readByte() shl 8) or readByte()
    }

    fun readBytes(length: Int): UByteArray {
        readIndex += length
        return source.slice(readIndex - length until readIndex).toUByteArray()
    }

    fun readLong(): Long {
        return readByteToLong() shl 56 or readByteToLong() shl 48 or readByteToLong() shl 40 or readByteToLong() shl 32 or readByteToLong() shl 24 or (readByteToLong() shl 16) or (readByteToLong() shl 8) or readByteToLong()
    }

    fun readVarint(optimizePositive: Boolean = false): Long {
        var byte: Int
        var value: Long = 0
        var shift = 0
        do {
            byte = readByte()
            value = value or (byte.toLong() and 0x7FL shl shift)
            shift += 7
        } while (byte and 0x80 != 0)

        if (!optimizePositive) {
            value = ((value shr 1) xor (-(value and 1L)))
        }
        return value
    }

//    fun readVarint(optimizePositive: Boolean = false): Long {
//        var b = readByte()
//        var value: Long = (b and 0x7F).toLong()
//        if (b and 0x80 != 0) {
//            b = readByte();
//            value = value or (b and 0x7F).toLong() shl 7
//            if (b and 0x80 != 0) {
//                b = readByte();
//                value = value or (b and 0x7F).toLong() shl 14
//                if (b and 0x80 != 0) {
//                    b = readByte();
//                    value = value or (b and 0x7F).toLong() shl 21
//                    if (b and 0x80 != 0) value = value or (readByte() and 0x7F).toLong() shl 28
//                }
//            }
//        }
//        if (!optimizePositive) value = ((value shr 1) xor (-(value and 1L)))
//        return value
//    }

    fun readFloat(): Float {
        return Float.fromBits(readInt())
    }


    fun readString(maxLength: Int = Int.MAX_VALUE): String? {
        var count = readVarint(true).toInt()
        if (count == 0) {
            return null
        }

        if (count-- > 1L) {
            if (count >= maxLength) count = maxLength - 1
            val result = source.asByteArray().decodeToString(readIndex, readIndex + count)
            readIndex += count
            return result
        }
        return ""
    }

    fun readRefString(): Int? {
        val index = readVarint(true).toInt()
        if (index == 0) {
            return null
        } else {
            return index - 1
        }
    }

    fun readColor(): Color {
        return ColorCode(readInt().toUInt())
    }

    fun readBoolean(): Boolean {
        return readByte().run {
            if (this == 0) return@run false
            if (this == 1) return@run true
            throw Exception("Invalid boolean for index: ${readIndex - 1}")
        }
    }
}