commonMain.org.jetbrains.letsPlot.util.pngj.PngHelperInternal.kt Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of lets-plot-kotlin-kernel Show documentation
Show all versions of lets-plot-kotlin-kernel Show documentation
Lets-Plot Kotlin API without dependencies.
/*
* Copyright (c) 2023 JetBrains s.r.o.
* Use of this source code is governed by the MIT license that can be found in the LICENSE file.
*
* This file has been modified by JetBrains : Java code has been converted to Kotlin code.
*
* THE FOLLOWING IS THE COPYRIGHT OF THE ORIGINAL DOCUMENT:
*
* Copyright (c) 2009-2012, Hernán J. González.
* Licensed under the Apache License, Version 2.0.
*
* The original PNGJ library is written in Java and can be found here: [PNGJ](https://github.com/leonbloy/pngj).
*/
@file:Suppress("unused", "UNUSED_PARAMETER", "KDocUnresolvedReference")
package org.jetbrains.letsPlot.util.pngj
import org.jetbrains.letsPlot.commons.logging.Logger
import org.jetbrains.letsPlot.commons.logging.PrintlnLogger
import kotlin.jvm.JvmOverloads
/**
* Some utility static methods for internal use.
*
*
* Client code should not normally use this class
*
*
*/
internal object PngHelperInternal {
private const val isDebug = false
private val LOGGER: Logger = PrintlnLogger(PngHelperInternal::class.simpleName ?: "PngHelperInternal")
/**
* Default charset, used internally by PNG for several things
*/
//var charsetLatin1: java.nio.charset.Charset = java.nio.charset.StandardCharsets.ISO_8859_1
/**
* UTF-8 is only used for some chunks
*/
//var charsetUTF8 = UTF_8
/**
* PNG magic bytes
*/
val pngIdSignature: ByteArray
get() = byteArrayOf(-119, 80, 78, 71, 13, 10, 26, 10)
fun doubleToInt100000(d: Double): Int {
return (d * 100000.0 + 0.5).toInt()
}
fun intToDouble100000(i: Int): Double {
return i / 100000.0
}
fun readByte(inputStream: InputPngStream): Int {
return try {
inputStream.read()
} catch (e: Throwable) {
throw PngjInputException("error reading byte", e)
}
}
/**
* -1 if eof
*
* PNG uses "network byte order"
*/
fun readInt2(inputStream: InputPngStream): Int {
return try {
val b1: Int = inputStream.read()
val b2: Int = inputStream.read()
if (b1 == -1 || b2 == -1) -1 else b1 shl 8 or b2
} catch (e: Throwable) {
throw PngjInputException("error reading Int2", e)
}
}
/**
* -1 if eof
*
* PNG uses "network byte order"
*/
fun readInt4(inputStream: InputPngStream): Int {
return try {
val b1: Int = inputStream.read()
val b2: Int = inputStream.read()
val b3: Int = inputStream.read()
val b4: Int = inputStream.read()
if (b1 == -1 || b2 == -1 || b3 == -1 || b4 == -1) -1 else b1 shl 24 or (b2 shl 16) or (b3 shl 8) + b4
} catch (e: Throwable) {
throw PngjInputException("error reading Int4", e)
}
}
fun readInt1fromByte(b: ByteArray?, offset: Int): Int {
require(b != null)
return b[offset].toInt() and 0xff
}
fun readInt2fromBytes(b: ByteArray?, offset: Int): Int {
require(b != null)
return b[offset].toInt() and 0xff shl 8 or (b[offset + 1].toInt() and 0xff)
}
fun readInt4fromBytes(b: ByteArray?, offset: Int): Int {
require(b != null)
return (b[offset].toInt() and 0xff shl 24 or (b[offset + 1].toInt() and 0xff shl 16) or (b[offset + 2].toInt() and 0xff shl 8)
or (b[offset + 3].toInt() and 0xff))
}
fun writeByte(os: OutputPngStream, b: Byte) {
try {
os.write(b.toInt())
} catch (e: Throwable) {
throw PngjOutputException(e)
}
}
fun writeByte(os: OutputPngStream, bs: ByteArray) {
try {
os.write(bs)
} catch (e: Throwable) {
throw PngjOutputException(e)
}
}
fun writeInt2(os: OutputPngStream, n: Int) {
val temp = byteArrayOf((n shr 8 and 0xff).toByte(), (n and 0xff).toByte())
writeBytes(os, temp)
}
fun writeInt4(os: OutputPngStream, n: Int) {
val temp = ByteArray(4)
writeInt4tobytes(n, temp, 0)
writeBytes(os, temp)
}
fun writeInt2tobytes(n: Int, b: ByteArray?, offset: Int) {
require(b != null)
b[offset] = (n shr 8 and 0xff).toByte()
b[offset + 1] = (n and 0xff).toByte()
}
fun writeInt4tobytes(n: Int, b: ByteArray?, offset: Int) {
require(b != null)
b[offset] = (n shr 24 and 0xff).toByte()
b[offset + 1] = (n shr 16 and 0xff).toByte()
b[offset + 2] = (n shr 8 and 0xff).toByte()
b[offset + 3] = (n and 0xff).toByte()
}
/**
* guaranteed to read exactly len bytes. throws error if it can't
*/
fun readBytes(inputStream: InputPngStream, b: ByteArray, offset: Int, len: Int) {
if (len == 0) return
try {
var read = 0
while (read < len) {
val n: Int = inputStream.read(b, offset + read, len - read)
if (n < 1) throw PngjInputException("error reading bytes, $n !=$len")
read += n
}
} catch (e: Throwable) {
throw PngjInputException("error reading", e)
}
}
fun skipBytes(inputStream: InputPngStream, len: Long) {
@Suppress("NAME_SHADOWING")
var len = len
try {
while (len > 0) {
val n1: Long = inputStream.skip(len)
if (n1 > 0) {
len -= n1
} else if (n1 == 0L) { // should we retry? lets read one byte
if (inputStream.read() == -1) // EOF
break else len--
} else throw Throwable("skip() returned a negative value ???")
}
} catch (e: Throwable) {
throw PngjInputException(e)
}
}
fun writeBytes(os: OutputPngStream, b: ByteArray) {
try {
os.write(b)
} catch (e: Throwable) {
throw PngjOutputException(e)
}
}
fun writeBytes(os: OutputPngStream, b: ByteArray, offset: Int, n: Int) {
try {
os.write(b, offset, n)
} catch (e: Throwable) {
throw PngjOutputException(e)
}
}
fun logdebug(msg: String) {
if (isDebug) println("logdebug: $msg")
}
// / filters
fun filterRowNone(r: Int): Int {
return (r and 0xFF)
}
fun filterRowSub(r: Int, left: Int): Int {
return (r - left) and 0xFF
}
fun filterRowUp(r: Int, up: Int): Int {
return (r - up) and 0xFF
}
fun filterRowAverage(r: Int, left: Int, up: Int): Int {
return r - (left + up) / 2 and 0xFF
}
fun filterRowPaeth(r: Int, left: Int, up: Int, upleft: Int): Int { // a = left, b = above, c
// = upper left
return r - filterPaethPredictor(left, up, upleft) and 0xFF
}
fun filterPaethPredictor(a: Int, b: Int, c: Int): Int { // a = left, b =
// above, c = upper
// left
// from
// http://www.libpng.org/pub/png/spec/1.2/PNG-Filters.html
val p = a + b - c // ; initial estimate
val pa = if (p >= a) p - a else a - p
val pb = if (p >= b) p - b else b - p
val pc = if (p >= c) p - c else c - p
// ; return nearest of a,b,c,
// ; breaking ties in order a,b,c.
return if (pa <= pb && pa <= pc) a else if (pb <= pc) b else c
}
/**
* Prits a debug message (prints class name, method and line number)
*
* @param obj
* : Object to print
*/
fun debug(obj: Any?) {
debug(obj, 1, true)
}
/**
* Prints a debug message (prints class name, method and line number) to
* stderr and logFile
*
* @param obj
* : Object to print
* @param offset
* : Offset N lines from stacktrace
* @param newLine
* : Print a newline char at the end ('\n')
*/
/**
* Prits a debug message (prints class name, method and line number)
*
* @param obj
* : Object to print
* @param offset
* : Offset N lines from stacktrace
*/
@JvmOverloads
fun debug(obj: Any?, offset: Int, newLine: Boolean = true) {
//val ste: java.lang.StackTraceElement = java.lang.Exception().getStackTrace().get(1 + offset)
//var steStr: String = ste.getClassName()
//val ind = steStr.lastIndexOf('.')
//steStr = steStr.substring(ind + 1)
//steStr += "." + ste.getMethodName() + "(" + ste.getLineNumber() + "): " + obj?.toString()
//println(steStr)
}
fun getDigest(pngr: PngReader): Long {
return pngr.simpleDigest
}
fun initCrcForTests(pngr: PngReader) {
pngr.prepareSimpleDigestComputation()
}
fun getRawIdatBytes(r: PngReader): Long { // in case of image with frames, returns the current one
return if (r.isInterlaced) r.chunkseq!!.deinterlacer!!.totalRawBytes else r.curImgInfo.totalRawBytes
}
}