Add SpeedBinb reader library (#1316)

* Add SpeedBinb reader library

* Make TextInterceptor generic

lib/speedbinb/build.gradle.kts

@@ -0,0 +1,24 @@
+plugins {
+    id("com.android.library")
+    kotlin("android")
+    id("kotlinx-serialization")
+}
+
+android {
+    compileSdk = AndroidConfig.compileSdk
+
+    defaultConfig {
+        minSdk = AndroidConfig.minSdk
+    }
+
+    namespace = "eu.kanade.tachiyomi.lib.speedbinb"
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly(libs.bundles.common)
+    implementation(project(":lib:textinterceptor"))
+}

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/Crypto.kt

@@ -0,0 +1,70 @@
+package eu.kanade.tachiyomi.lib.speedbinb
+
+private const val URLSAFE_BASE64_LOOKUP = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+
+internal fun determineKeyPair(src: String?, ptbl: List<String>, ctbl: List<String>): Pair<String, String> {
+    val i = mutableListOf(0, 0)
+
+    if (src != null) {
+        val filename = src.substringAfterLast("/")
+
+        for (e in filename.indices) {
+            i[e % 2] = i[e % 2] + filename[e].code
+        }
+
+        i[0] = i[0] % 8
+        i[1] = i[1] % 8
+    }
+
+    return Pair(ptbl[i[0]], ctbl[i[1]])
+}
+
+internal fun decodeScrambleTable(cid: String, sharedKey: String, table: String): String {
+    val r = "$cid:$sharedKey"
+    var e = r.toCharArray()
+        .map { it.code }
+        .reduceIndexed { index, acc, i -> acc + (i shl index % 16) } and 2147483647
+
+    if (e == 0) {
+        e = 0x12345678
+    }
+
+    return buildString(table.length) {
+        for (s in table.indices) {
+            e = e ushr 1 xor (1210056708 and -(1 and e))
+            append(((table[s].code - 32 + e) % 94 + 32).toChar())
+        }
+    }
+}
+
+internal fun generateSharedKey(cid: String): String {
+    val randomChars = randomChars(16)
+    val cidRepeatCount = (16 + cid.length - 1) / cid.length
+    val unk1 = buildString(cid.length * cidRepeatCount) {
+        for (i in 0 until cidRepeatCount) {
+            append(cid)
+        }
+    }
+    val unk2 = unk1.substring(0, 16)
+    val unk3 = unk1.substring(unk1.length - 16, unk1.length)
+    var s = 0
+    var h = 0
+    var u = 0
+
+    return buildString(randomChars.length * 2) {
+        for (i in randomChars.indices) {
+            s = s xor randomChars[i].code
+            h = h xor unk2[i].code
+            u = u xor unk3[i].code
+
+            append(randomChars[i])
+            append(URLSAFE_BASE64_LOOKUP[(s + h + u) and 63])
+        }
+    }
+}
+
+private fun randomChars(length: Int) = buildString(length) {
+    for (i in 0 until length) {
+        append(URLSAFE_BASE64_LOOKUP.random())
+    }
+}

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/Models.kt

@@ -0,0 +1,102 @@
+package eu.kanade.tachiyomi.lib.speedbinb
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import okhttp3.HttpUrl
+import okhttp3.HttpUrl.Companion.toHttpUrl
+
+private val COORD_REGEX = Regex("""^i:(\d+),(\d+)\+(\d+),(\d+)>(\d+),(\d+)$""")
+
+@Serializable
+class BibContentInfo(
+    val result: Int,
+    val items: List<BibContentItem>,
+)
+
+@Serializable
+class BibContentItem(
+    @SerialName("ContentID") val contentId: String,
+    @SerialName("ContentsServer") val contentServer: String,
+    @SerialName("ServerType") val serverType: Int,
+    val stbl: String,
+    val ttbl: String,
+    val ptbl: String,
+    val ctbl: String,
+    @SerialName("p") val requestToken: String? = null,
+    @SerialName("ViewMode") val viewMode: Int,
+    @SerialName("ContentDate") val contentDate: String? = null,
+    @SerialName("ShopURL") val shopUrl: String? = null,
+) {
+    fun getSbcUrl(readerUrl: HttpUrl, cid: String) =
+        contentServer.toHttpUrl().newBuilder().apply {
+            when (serverType) {
+                ServerType.DIRECT -> addPathSegment("content.js")
+                ServerType.REST -> addPathSegment("content")
+                ServerType.SBC -> {
+                    addPathSegment("sbcGetCntnt.php")
+                    setQueryParameter("cid", cid)
+                    requestToken?.let { setQueryParameter("p", it) }
+                    setQueryParameter("q", "1")
+                    setQueryParameter("vm", viewMode.toString())
+                    setQueryParameter("dmytime", contentDate ?: System.currentTimeMillis().toString())
+                    copyKeyParametersFrom(readerUrl)
+                }
+                else -> throw UnsupportedOperationException("Unsupported ServerType value $serverType")
+            }
+        }.toString()
+}
+
+object ServerType {
+    const val SBC = 0
+    const val DIRECT = 1
+    const val REST = 2
+}
+
+object ViewMode {
+    const val COMMERCIAL = 1
+    const val NON_MEMBER_TRIAL = 2
+    const val MEMBER_TRIAL = 3
+}
+
+@Serializable
+class PtImg(
+    @SerialName("ptimg-version") val ptImgVersion: Int,
+    val resources: PtImgResources,
+    val views: List<PtImgViews>,
+) {
+    val translations by lazy {
+        views[0].coords.map { coord ->
+            val v = COORD_REGEX.matchEntire(coord)!!.groupValues.drop(1).map { it.toInt() }
+            PtImgTranslation(v[0], v[1], v[2], v[3], v[4], v[5])
+        }
+    }
+}
+
+@Serializable
+class PtImgResources(
+    val i: PtImgImage,
+)
+
+@Serializable
+class PtImgImage(
+    val src: String,
+    val width: Int,
+    val height: Int,
+)
+
+@Serializable
+class PtImgViews(
+    val width: Int,
+    val height: Int,
+    val coords: Array<String>,
+)
+
+class PtImgTranslation(val xsrc: Int, val ysrc: Int, val width: Int, val height: Int, val xdest: Int, val ydest: Int)
+
+@Serializable
+class SBCContent(
+    @SerialName("SBCVersion") val sbcVersion: String,
+    val result: Int,
+    val ttx: String,
+    @SerialName("ImageClass") val imageClass: String? = null,
+)

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/SpeedBinbInterceptor.kt

@@ -0,0 +1,85 @@
+package eu.kanade.tachiyomi.lib.speedbinb
+
+import android.graphics.BitmapFactory
+import eu.kanade.tachiyomi.lib.speedbinb.descrambler.PtBinbDescramblerA
+import eu.kanade.tachiyomi.lib.speedbinb.descrambler.PtBinbDescramblerF
+import eu.kanade.tachiyomi.lib.speedbinb.descrambler.PtImgDescrambler
+import eu.kanade.tachiyomi.lib.textinterceptor.TextInterceptor
+import eu.kanade.tachiyomi.lib.textinterceptor.TextInterceptorHelper
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import okhttp3.Interceptor
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.Request
+import okhttp3.Response
+import okhttp3.ResponseBody.Companion.toResponseBody
+import java.io.IOException
+
+class SpeedBinbInterceptor(private val json: Json) : Interceptor {
+
+    private val textInterceptor by lazy { TextInterceptor() }
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        val request = chain.request()
+        val host = request.url.host
+        val filename = request.url.pathSegments.last()
+        val fragment = request.url.fragment
+
+        return when {
+            host == TextInterceptorHelper.HOST -> textInterceptor.intercept(chain)
+            filename.endsWith(".ptimg.json") -> interceptPtImg(chain, request)
+            fragment == null -> chain.proceed(request)
+            fragment.startsWith("ptbinb,") -> interceptPtBinB(chain, request)
+            else -> chain.proceed(request)
+        }
+    }
+
+    private fun interceptPtImg(chain: Interceptor.Chain, request: Request): Response {
+        val response = chain.proceed(request)
+        val metadata = json.decodeFromString<PtImg>(response.body.string())
+        val imageUrl = request.url.newBuilder()
+            .setPathSegment(request.url.pathSize - 1, metadata.resources.i.src)
+            .build()
+        val imageResponse = chain.proceed(
+            request.newBuilder().url(imageUrl).build(),
+        )
+
+        if (metadata.translations.isEmpty()) {
+            return imageResponse
+        }
+
+        val image = BitmapFactory.decodeStream(imageResponse.body.byteStream())
+        val descrambler = PtImgDescrambler(metadata)
+        return imageResponse.newBuilder()
+            .body(descrambler.descrambleImage(image)!!.toResponseBody(JPEG_MEDIA_TYPE))
+            .build()
+    }
+
+    private fun interceptPtBinB(chain: Interceptor.Chain, request: Request): Response {
+        val response = chain.proceed(request)
+        val fragment = request.url.fragment!!
+        val (s, u) = fragment.removePrefix("ptbinb,").split(",", limit = 2)
+
+        if (s.isEmpty() && u.isEmpty()) {
+            return response
+        }
+
+        val imageData = response.body.bytes()
+        val image = BitmapFactory.decodeByteArray(imageData, 0, imageData.size)
+        val descrambler = if (s[0] == '=' && u[0] == '=') {
+            PtBinbDescramblerF(s, u, image.width, image.height)
+        } else if (NUMERIC_CHARACTERS.contains(s[0]) && NUMERIC_CHARACTERS.contains(u[0])) {
+            PtBinbDescramblerA(s, u, image.width, image.height)
+        } else {
+            throw IOException("Cannot select descrambler for key pair s=$s, u=$u")
+        }
+        val descrambled = descrambler.descrambleImage(image) ?: imageData
+
+        return response.newBuilder()
+            .body(descrambled.toResponseBody(JPEG_MEDIA_TYPE))
+            .build()
+    }
+}
+
+private const val NUMERIC_CHARACTERS = "0123456789"
+private val JPEG_MEDIA_TYPE = "image/jpeg".toMediaType()

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/SpeedBinbReader.kt

@@ -0,0 +1,197 @@
+package eu.kanade.tachiyomi.lib.speedbinb
+
+import eu.kanade.tachiyomi.lib.textinterceptor.TextInterceptorHelper
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.source.model.Page
+import eu.kanade.tachiyomi.util.asJsoup
+import kotlinx.serialization.decodeFromString
+import kotlinx.serialization.json.Json
+import okhttp3.Headers
+import okhttp3.HttpUrl
+import okhttp3.HttpUrl.Companion.toHttpUrl
+import okhttp3.OkHttpClient
+import okhttp3.Response
+import org.jsoup.Jsoup
+import org.jsoup.nodes.Document
+
+/**
+ * SpeedBinb is a reader for various Japanese manga sites.
+ *
+ * Versions (`SpeedBinb.VERSION` in DevTools console):
+ * - Minimum version tested: `1.6650.0001`
+ * - Maximum version tested: `1.6930.1101`
+ *
+ * These versions are only for reference purposes, and does not reflect the actual range
+ * of versions this class can scrape.
+ */
+class SpeedBinbReader(
+    private val client: OkHttpClient,
+    private val headers: Headers,
+    private val json: Json,
+    private val highQualityMode: Boolean = false,
+) {
+    private val isInterceptorAdded by lazy {
+        client.interceptors.filterIsInstance<SpeedBinbInterceptor>().isNotEmpty()
+    }
+
+    fun pageListParse(response: Response): List<Page> =
+        pageListParse(response.asJsoup())
+
+    fun pageListParse(document: Document): List<Page> {
+        // We throw here instead of in the `init {}` block because extensions that fail
+        // to load just mysteriously disappears from the extension list, no errors no nothing.
+        if (!isInterceptorAdded) {
+            throw Exception("SpeedBinbInterceptor was not added to the client.")
+        }
+
+        val readerUrl = document.location().toHttpUrl()
+        val content = document.selectFirst("#content")!!
+
+        if (!content.hasAttr("data-ptbinb")) {
+            return content.select("[data-ptimg]").mapIndexed { i, it ->
+                Page(i, imageUrl = it.absUrl("data-ptimg"))
+            }
+        }
+
+        val cid = content.attr("data-ptbinb-cid")
+            .ifEmpty { readerUrl.queryParameter("cid") }
+            ?: throw Exception("Could not find chapter ID")
+        val sharedKey = generateSharedKey(cid)
+        val contentInfoUrl = content.absUrl("data-ptbinb").toHttpUrl().newBuilder()
+            .copyKeyParametersFrom(readerUrl)
+            .setQueryParameter("cid", cid)
+            .setQueryParameter("k", sharedKey)
+            .setQueryParameter("dmytime", System.currentTimeMillis().toString())
+            .build()
+        val contentInfo = client.newCall(GET(contentInfoUrl, headers)).execute().parseAs<BibContentInfo>()
+
+        if (contentInfo.result != 1) {
+            throw Exception("Failed to execute bibGetCntntInfo API.")
+        }
+
+        if (contentInfo.items.isEmpty()) {
+            throw Exception("There is no item.")
+        }
+
+        val contentItem = contentInfo.items[0]
+        val ctbl = json.decodeFromString<List<String>>(decodeScrambleTable(cid, sharedKey, contentItem.ctbl))
+        val ptbl = json.decodeFromString<List<String>>(decodeScrambleTable(cid, sharedKey, contentItem.ptbl))
+        val sbcUrl = contentItem.getSbcUrl(readerUrl, cid)
+        val sbcData = client.newCall(GET(sbcUrl, headers)).execute().body.string().let {
+            val raw = if (contentItem.serverType == ServerType.DIRECT) {
+                it.substringAfter("DataGet_Content(").substringBeforeLast(")")
+            } else {
+                it
+            }
+
+            json.decodeFromString<SBCContent>(raw)
+        }
+
+        if (sbcData.result != 1) {
+            throw Exception("Failed to fetch content")
+        }
+
+        val isSingleQuality = sbcData.imageClass == "singlequality"
+        val ttx = Jsoup.parseBodyFragment(sbcData.ttx, document.location())
+        val pageBaseUrl = when (contentItem.serverType) {
+            ServerType.DIRECT, ServerType.REST -> contentItem.contentServer
+            ServerType.SBC -> sbcUrl.replaceFirst("/sbcGetCntnt.php", "/sbcGetImg.php")
+            else -> throw UnsupportedOperationException("Unsupported ServerType value ${contentItem.serverType}")
+        }.toHttpUrl()
+        val pages = ttx.select("t-case:first-of-type t-img").mapIndexed { i, it ->
+            val src = it.attr("src")
+            val keyPair = determineKeyPair(src, ptbl, ctbl)
+            val fragment = "ptbinb,${keyPair.first},${keyPair.second}"
+            val imageUrl = pageBaseUrl.newBuilder()
+                .buildImageUrl(
+                    readerUrl,
+                    src,
+                    contentItem,
+                    isSingleQuality,
+                    highQualityMode,
+                )
+                .fragment(fragment)
+                .toString()
+
+            Page(i, imageUrl = imageUrl)
+        }.toMutableList()
+
+        // This is probably the silliest use of TextInterceptor ever.
+        //
+        // If chapter purchases are enabled, and there's a link to purchase the current chapter,
+        // we add in the purchase URL as the last page.
+        val buyIconPosition = document.selectFirst("script:containsData(Config.LoginBuyIconPosition)")
+            ?.data()
+            ?.substringAfter("Config.LoginBuyIconPosition=")
+            ?.substringBefore(";")
+            ?.trim()
+            ?: "-1"
+        val enableBuying = buyIconPosition != "-1"
+
+        if (enableBuying && contentItem.viewMode != ViewMode.COMMERCIAL && !contentItem.shopUrl.isNullOrEmpty()) {
+            pages.add(
+                Page(pages.size, imageUrl = TextInterceptorHelper.createUrl("", "購入： ${contentItem.shopUrl}")),
+            )
+        }
+
+        return pages
+    }
+
+    private inline fun <reified T> Response.parseAs(): T =
+        json.decodeFromString(body.string())
+}
+
+private fun HttpUrl.Builder.buildImageUrl(
+    readerUrl: HttpUrl,
+    src: String,
+    contentItem: BibContentItem,
+    isSingleQuality: Boolean,
+    highQualityMode: Boolean,
+) = apply {
+    when (contentItem.serverType) {
+        ServerType.DIRECT -> {
+            val filename = when {
+                isSingleQuality -> "M.jpg"
+                highQualityMode -> "M_H.jpg"
+                else -> "M_L.jpg"
+            }
+
+            addPathSegments(src)
+            addPathSegment(filename)
+            contentItem.contentDate?.let { setQueryParameter("dmytime", it) }
+        }
+        ServerType.REST -> {
+            addPathSegment("img")
+            addPathSegments(src)
+            if (!isSingleQuality && !highQualityMode) {
+                setQueryParameter("q", "1")
+            }
+
+            contentItem.contentDate?.let { setQueryParameter("dmytime", it) }
+            copyKeyParametersFrom(readerUrl)
+        }
+        ServerType.SBC -> {
+            setQueryParameter("src", src)
+            contentItem.requestToken?.let { setQueryParameter("p", it) }
+
+            if (!isSingleQuality) {
+                setQueryParameter("q", if (highQualityMode) "0" else "1")
+            }
+
+            setQueryParameter("vm", contentItem.viewMode.toString())
+            contentItem.contentDate?.let { setQueryParameter("dmytime", it) }
+            copyKeyParametersFrom(readerUrl)
+        }
+        else -> throw UnsupportedOperationException("Unsupported ServerType value ${contentItem.serverType}")
+    }
+}
+
+internal fun HttpUrl.Builder.copyKeyParametersFrom(url: HttpUrl): HttpUrl.Builder {
+    for (i in 0..9) {
+        url.queryParameter("u$i")?.let {
+            setQueryParameter("u$i", it)
+        }
+    }
+
+    return this
+}

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/descrambler/PtBinbDescrambler.kt

@@ -0,0 +1,301 @@
+package eu.kanade.tachiyomi.lib.speedbinb.descrambler
+
+import eu.kanade.tachiyomi.lib.speedbinb.PtImgTranslation
+
+private val PTBINBF_REGEX = Regex("""^=([0-9]+)-([0-9]+)([-+])([0-9]+)-([-_0-9A-Za-z]+)$""")
+private const val PTBINBF_CHAR_LOOKUP = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+private const val PTBINBA_CHAR_LOOKUP = "aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ"
+
+abstract class PtBinbDescrambler(
+    val s: String,
+    val u: String,
+    val width: Int,
+    val height: Int,
+) : SpeedBinbDescrambler()
+
+class PtBinbDescramblerF(s: String, u: String, width: Int, height: Int) : PtBinbDescrambler(s, u, width, height) {
+
+    private var widthPieces: Int = 0
+    private var heightPieces: Int = 0
+    private var piecePadding: Int = 0
+    private lateinit var hDstPosLookup: List<Int>
+    private lateinit var wDstPosLookup: List<Int>
+    private lateinit var hPosLookup: List<Int>
+    private lateinit var wPosLookup: List<Int>
+    private var pieceDest: List<Int>? = null
+
+    init {
+        // Kotlin init blocks don't allow early returns...
+        init()
+    }
+
+    private fun init() {
+        val srcData = PTBINBF_REGEX.matchEntire(s)?.groupValues
+        val dstData = PTBINBF_REGEX.matchEntire(u)?.groupValues
+
+        if (
+            dstData == null ||
+            srcData == null ||
+            dstData[1] != srcData[1] ||
+            dstData[2] != srcData[2] ||
+            dstData[4] != srcData[4] ||
+            dstData[3] != "+" ||
+            srcData[3] != "-"
+        ) {
+            return
+        }
+
+        widthPieces = dstData[1].toInt()
+        heightPieces = dstData[2].toInt()
+        piecePadding = dstData[4].toInt()
+
+        if (widthPieces < 8 || heightPieces < 8 || widthPieces * heightPieces < 64) {
+            return
+        }
+
+        val e = widthPieces + heightPieces + widthPieces * heightPieces
+
+        if (dstData[5].length != e || srcData[5].length != e) {
+            return
+        }
+
+        val srcTnp = decodePieceData(srcData[5])
+        val dstTnp = decodePieceData(dstData[5])
+
+        hDstPosLookup = dstTnp.hPos
+        wDstPosLookup = dstTnp.wPos
+        hPosLookup = srcTnp.hPos
+        wPosLookup = srcTnp.wPos
+        pieceDest = buildList(widthPieces * heightPieces) {
+            for (i in 0 until widthPieces * heightPieces) {
+                add(dstTnp.pieces[srcTnp.pieces[i]])
+            }
+        }
+    }
+
+    override fun isScrambled() =
+        pieceDest != null
+
+    override fun canDescramble(): Boolean {
+        val i = 2 * widthPieces * piecePadding
+        val n = 2 * heightPieces * piecePadding
+
+        return width >= 64 + i && height >= 64 + n && width * height >= (320 + i) * (320 + n)
+    }
+
+    override fun getCanvasDimensions(): Pair<Int, Int> {
+        return if (canDescramble()) {
+            Pair(
+                width - 2 * widthPieces * piecePadding,
+                height - 2 * heightPieces * piecePadding,
+            )
+        } else {
+            Pair(width, height)
+        }
+    }
+
+    override fun getDescrambleCoords(): List<PtImgTranslation> {
+        val pieceDest = this.pieceDest
+
+        if (!isScrambled() || pieceDest == null) {
+            return emptyList()
+        }
+
+        if (!canDescramble()) {
+            return listOf(
+                PtImgTranslation(0, 0, width, height, 0, 0),
+            )
+        }
+
+        val canvasWidth = width - 2 * widthPieces * piecePadding
+        val canvasHeight = height - 2 * heightPieces * piecePadding
+        val pieceWidth = (canvasWidth + widthPieces - 1).div(widthPieces)
+        val remainderWidth = canvasWidth - (widthPieces - 1) * pieceWidth
+        val pieceHeight = (canvasHeight + heightPieces - 1).div(heightPieces)
+        val remainderHeight = canvasHeight - (heightPieces - 1) * pieceHeight
+
+        return buildList(widthPieces * heightPieces) {
+            for (o in 0 until widthPieces * heightPieces) {
+                val hPos = o % widthPieces
+                val wPos = o.div(widthPieces)
+                val hDstPos = pieceDest[o] % widthPieces
+                val wDstPos = pieceDest[o].div(widthPieces)
+
+                add(
+                    PtImgTranslation(
+                        xsrc = piecePadding + hPos * (pieceWidth + 2 * piecePadding) + if (hPosLookup[wPos] < hPos) remainderWidth - pieceWidth else 0,
+                        ysrc = piecePadding + wPos * (pieceHeight + 2 * piecePadding) + if (wPosLookup[hPos] < wPos) remainderHeight - pieceHeight else 0,
+                        width = if (hPosLookup[wPos] == hPos) remainderWidth else pieceWidth,
+                        height = if (wPosLookup[hPos] == wPos) remainderHeight else pieceHeight,
+                        xdest = hDstPos * pieceWidth + if (hDstPosLookup[wDstPos] < hDstPos) remainderWidth - pieceWidth else 0,
+                        ydest = wDstPos * pieceHeight + if (wDstPosLookup[hDstPos] < wDstPos) remainderHeight - pieceHeight else 0,
+                    ),
+                )
+            }
+        }
+    }
+
+    private fun decodePieceData(key: String): TNP {
+        val wPos = buildList(widthPieces) {
+            for (i in 0 until widthPieces) {
+                add(PTBINBF_CHAR_LOOKUP.indexOf(key[i]))
+            }
+        }
+        val hPos = buildList(heightPieces) {
+            for (i in 0 until heightPieces) {
+                add(PTBINBF_CHAR_LOOKUP.indexOf(key[widthPieces + i]))
+            }
+        }
+        val pieces = buildList(widthPieces * heightPieces) {
+            for (i in 0 until widthPieces * heightPieces) {
+                add(PTBINBF_CHAR_LOOKUP.indexOf(key[widthPieces + heightPieces + i]))
+            }
+        }
+
+        return TNP(wPos, hPos, pieces)
+    }
+
+    private class TNP(val wPos: List<Int>, val hPos: List<Int>, val pieces: List<Int>)
+}
+
+class PtBinbDescramblerA(s: String, u: String, width: Int, height: Int) : PtBinbDescrambler(s, u, width, height) {
+
+    private var srcPieces: PieceCollection? = null
+
+    private var dstPieces: PieceCollection? = null
+
+    init {
+        val srcPieces = calculatePieces(u)
+        val dstPieces = calculatePieces(s)
+
+        if (
+            srcPieces != null &&
+            dstPieces != null &&
+            srcPieces.ndx == dstPieces.ndx &&
+            srcPieces.ndy == dstPieces.ndy
+        ) {
+            this.srcPieces = srcPieces
+            this.dstPieces = dstPieces
+        }
+    }
+
+    override fun isScrambled() =
+        srcPieces != null && dstPieces != null
+
+    override fun canDescramble(): Boolean =
+        width >= 64 && height >= 64 && width * height >= 102400
+
+    override fun getCanvasDimensions(): Pair<Int, Int> =
+        Pair(width, height)
+
+    override fun getDescrambleCoords(): List<PtImgTranslation> {
+        if (!isScrambled()) {
+            return emptyList()
+        }
+
+        if (!canDescramble()) {
+            return listOf(
+                PtImgTranslation(0, 0, width, height, 0, 0),
+            )
+        }
+
+        val srcPieces = this.srcPieces!!
+        val dstPieces = this.dstPieces!!
+
+        return buildList(srcPieces.piece.size + 2) {
+            val n = width - width % 8
+            val pieceWidth = (n - 1).div(7) - (n - 1).div(7) % 8
+            val e = n - 7 * pieceWidth
+            val s = height - height % 8
+            val pieceHeight = (s - 1).div(7) - (s - 1).div(7) % 8
+            val u = s - 7 * pieceHeight
+
+            for (i in srcPieces.piece.indices) {
+                val src = srcPieces.piece[i]
+                val dst = dstPieces.piece[i]
+
+                add(
+                    PtImgTranslation(
+                        xsrc = src.x.div(2) * pieceWidth + src.x % 2 * e,
+                        ysrc = src.y.div(2) * pieceHeight + src.y % 2 * u,
+                        width = src.w.div(2) * pieceWidth + src.w % 2 * e,
+                        height = src.h.div(2) * pieceHeight + src.h % 2 * u,
+                        xdest = dst.x.div(2) * pieceWidth + dst.x % 2 * e,
+                        ydest = dst.y.div(2) * pieceHeight + dst.y % 2 * u,
+                    ),
+                )
+            }
+
+            val l = pieceWidth * (srcPieces.ndx - 1) + e
+            val v = pieceHeight * (srcPieces.ndy - 1) + u
+
+            if (l < width) {
+                add(
+                    PtImgTranslation(l, 0, width - l, v, l, 0),
+                )
+            }
+
+            if (v < height) {
+                add(
+                    PtImgTranslation(0, v, width, height - v, 0, v),
+                )
+            }
+        }
+    }
+
+    private fun calculatePieces(key: String): PieceCollection? {
+        if (key.isEmpty()) {
+            return null
+        }
+
+        val parts = key.split("-")
+
+        if (parts.size != 3) {
+            return null
+        }
+
+        val ndx = parts[0].toInt()
+        val ndy = parts[1].toInt()
+        val e = parts[2]
+
+        if (ndx * ndy * 2 != e.length) {
+            return null
+        }
+
+        val pieces = buildList(ndx * ndy) {
+            val a = (ndx - 1) * (ndy - 1) - 1
+            val f = ndx - 1 + a
+            val c = ndy - 1 + f
+            val l = 1 + c
+            var w = 0
+            var h = 0
+
+            for (d in 0 until ndx * ndy) {
+                val x = PTBINBA_CHAR_LOOKUP.indexOf(e[2 * d])
+                val y = PTBINBA_CHAR_LOOKUP.indexOf(e[2 * d + 1])
+
+                if (d <= a) {
+                    h = 2
+                    w = 2
+                } else if (d <= f) {
+                    h = 1
+                    w = 2
+                } else if (d <= c) {
+                    h = 2
+                    w = 1
+                } else if (d <= l) {
+                    h = 1
+                    w = 1
+                }
+
+                add(Piece(x, y, w, h))
+            }
+        }
+
+        return PieceCollection(ndx, ndy, pieces)
+    }
+
+    private class Piece(val x: Int, val y: Int, val w: Int, val h: Int)
+
+    private class PieceCollection(val ndx: Int, val ndy: Int, val piece: List<Piece>)
+}

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/descrambler/PtImgDescrambler.kt

@@ -0,0 +1,13 @@
+package eu.kanade.tachiyomi.lib.speedbinb.descrambler
+
+import eu.kanade.tachiyomi.lib.speedbinb.PtImg
+
+class PtImgDescrambler(private val metadata: PtImg) : SpeedBinbDescrambler() {
+    override fun isScrambled() = metadata.translations.isNotEmpty()
+
+    override fun canDescramble() = metadata.translations.isNotEmpty()
+
+    override fun getCanvasDimensions() = Pair(metadata.views[0].width, metadata.views[0].height)
+
+    override fun getDescrambleCoords() = metadata.translations
+}

lib/speedbinb/src/main/java/eu/kanade/tachiyomi/lib/speedbinb/descrambler/SpeedBinbDescrambler.kt

@@ -0,0 +1,37 @@
+package eu.kanade.tachiyomi.lib.speedbinb.descrambler
+
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.Rect
+import eu.kanade.tachiyomi.lib.speedbinb.PtImgTranslation
+import java.io.ByteArrayOutputStream
+
+abstract class SpeedBinbDescrambler {
+    abstract fun isScrambled(): Boolean
+    abstract fun canDescramble(): Boolean
+    abstract fun getCanvasDimensions(): Pair<Int, Int>
+    abstract fun getDescrambleCoords(): List<PtImgTranslation>
+
+    open fun descrambleImage(image: Bitmap): ByteArray? {
+        if (!isScrambled()) {
+            return null
+        }
+
+        val (width, height) = getCanvasDimensions()
+        val result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(result)
+
+        getDescrambleCoords().forEach {
+            val src = Rect(it.xsrc, it.ysrc, it.xsrc + it.width, it.ysrc + it.height)
+            val dst = Rect(it.xdest, it.ydest, it.xdest + it.width, it.ydest + it.height)
+
+            canvas.drawBitmap(image, src, dst, null)
+        }
+
+        return ByteArrayOutputStream()
+            .also {
+                result.compress(Bitmap.CompressFormat.JPEG, 90, it)
+            }
+            .toByteArray()
+    }
+}

lib/textinterceptor/src/main/java/eu/kanade/tachiyomi/lib/textinterceptor/TextInterceptor.kt

@@ -18,69 +18,73 @@ import okhttp3.Response
 import okhttp3.ResponseBody.Companion.toResponseBody
 import java.io.ByteArrayOutputStream
 
+// Designer values:
+private const val WIDTH: Int = 1000
+private const val X_PADDING: Float = 50f
+private const val Y_PADDING: Float = 25f
+private const val HEADING_FONT_SIZE: Float = 36f
+private const val BODY_FONT_SIZE: Float = 30f
+private const val SPACING_MULT: Float = 1.1f
+private const val SPACING_ADD: Float = 2f
+
+// No need to touch this one:
+private const val HOST = TextInterceptorHelper.HOST
+
 class TextInterceptor : Interceptor {
     // With help from:
     // https://github.com/tachiyomiorg/tachiyomi-extensions/pull/13304#issuecomment-1234532897
     // https://medium.com/over-engineering/drawing-multiline-text-to-canvas-on-android-9b98f0bfa16a
-
-    companion object {
-        // Designer values:
-        private const val WIDTH: Int = 1000
-        private const val X_PADDING: Float = 50f
-        private const val Y_PADDING: Float = 25f
-        private const val HEADING_FONT_SIZE: Float = 36f
-        private const val BODY_FONT_SIZE: Float = 30f
-        private const val SPACING_MULT: Float = 1.1f
-        private const val SPACING_ADD: Float = 2f
-
-        // No need to touch this one:
-        private const val HOST = TextInterceptorHelper.HOST
-    }
-
     override fun intercept(chain: Interceptor.Chain): Response {
         val request = chain.request()
         val url = request.url
         if (url.host != HOST) return chain.proceed(request)
 
-        val creator = textFixer("Author's Notes from ${url.pathSegments[0]}")
-        val story = textFixer(url.pathSegments[1])
+        val heading = url.pathSegments[0].takeIf { it.isNotEmpty() }?.let {
+            val title = textFixer(url.pathSegments[0])
 
-        // Heading
-        val paintHeading = TextPaint().apply {
-            color = Color.BLACK
-            textSize = HEADING_FONT_SIZE
-            typeface = Typeface.DEFAULT_BOLD
-            isAntiAlias = true
+            // Heading
+            val paintHeading = TextPaint().apply {
+                color = Color.BLACK
+                textSize = HEADING_FONT_SIZE
+                typeface = Typeface.DEFAULT_BOLD
+                isAntiAlias = true
+            }
+
+            @Suppress("DEPRECATION")
+            StaticLayout(
+                title, paintHeading, (WIDTH - 2 * X_PADDING).toInt(),
+                Layout.Alignment.ALIGN_NORMAL, SPACING_MULT, SPACING_ADD, true
+            )
         }
 
-        @Suppress("DEPRECATION")
-        val heading = StaticLayout(
-            creator, paintHeading, (WIDTH - 2 * X_PADDING).toInt(),
-            Layout.Alignment.ALIGN_NORMAL, SPACING_MULT, SPACING_ADD, true
-        )
+        val body = url.pathSegments[1].takeIf { it.isNotEmpty() }?.let {
+            val story = textFixer(it)
 
-        // Body
-        val paintBody = TextPaint().apply {
-            color = Color.BLACK
-            textSize = BODY_FONT_SIZE
-            typeface = Typeface.DEFAULT
-            isAntiAlias = true
+            // Body
+            val paintBody = TextPaint().apply {
+                color = Color.BLACK
+                textSize = BODY_FONT_SIZE
+                typeface = Typeface.DEFAULT
+                isAntiAlias = true
+            }
+
+            @Suppress("DEPRECATION")
+            StaticLayout(
+                story, paintBody, (WIDTH - 2 * X_PADDING).toInt(),
+                Layout.Alignment.ALIGN_NORMAL, SPACING_MULT, SPACING_ADD, true
+            )
         }
 
-        @Suppress("DEPRECATION")
-        val body = StaticLayout(
-            story, paintBody, (WIDTH - 2 * X_PADDING).toInt(),
-            Layout.Alignment.ALIGN_NORMAL, SPACING_MULT, SPACING_ADD, true
-        )
-
         // Image building
-        val imgHeight: Int = (heading.height + body.height + 2 * Y_PADDING).toInt()
+        val headingHeight = heading?.height ?: 0
+        val bodyHeight = body?.height ?: 0
+        val imgHeight: Int = (headingHeight + bodyHeight + 2 * Y_PADDING).toInt()
         val bitmap: Bitmap = Bitmap.createBitmap(WIDTH, imgHeight, Bitmap.Config.ARGB_8888)
 
         Canvas(bitmap).apply {
             drawColor(Color.WHITE)
-            heading.draw(this, X_PADDING, Y_PADDING)
-            body.draw(this, X_PADDING, Y_PADDING + heading.height.toFloat())
+            heading?.draw(this, X_PADDING, Y_PADDING)
+            body?.draw(this, X_PADDING, Y_PADDING + headingHeight.toFloat())
         }
 
         // Image converting & returning
@@ -119,7 +123,7 @@ object TextInterceptorHelper {
 
     const val HOST = "tachiyomi-lib-textinterceptor"
 
-    fun createUrl(creator: String, text: String): String {
-        return "http://$HOST/" + Uri.encode(creator) + "/" + Uri.encode(text)
+    fun createUrl(title: String, text: String): String {
+        return "http://$HOST/" + Uri.encode(title) + "/" + Uri.encode(text)
     }
 }

src/all/comicfury/src/eu/kanade/tachiyomi/extension/all/comicfury/ComicFury.kt

@@ -129,9 +129,9 @@ class ComicFury(
                         response.request.url.toString(),
                         TextInterceptorHelper.createUrl(
                             jsp.selectFirst("a.is--comment-author")?.ownText()
-                                ?: "Error No Author For Comment Found",
-                            jsp.selectFirst("div.is--comment-content")?.html()
-                                ?: "Error No Comment Content Found",
+                                ?.let { "Author's Notes from $it" }
+                                .orEmpty(),
+                            jsp.selectFirst("div.is--comment-content")?.html().orEmpty(),
                         ),
                     ),
                 )

src/all/webtoons/src/eu/kanade/tachiyomi/extension/all/webtoons/WebtoonsSrc.kt

@@ -65,7 +65,7 @@ open class WebtoonsSrc(
                 pages = pages + Page(
                     pages.size,
                     "",
-                    TextInterceptorHelper.createUrl(creator, note),
+                    TextInterceptorHelper.createUrl("Author's Notes from $creator", note),
                 )
             }
         }

src/en/grrlpower/src/eu/kanade/tachiyomi/extension/en/grrlpower/GrrlPower.kt

@@ -114,7 +114,7 @@ class GrrlPower(
         val text = soup.getElementsByClass("entry").html()
 
         if (text.isNotEmpty() && showAuthorsNotesPref()) {
-            pages.add(Page(1, "", TextInterceptorHelper.createUrl(comicAuthor, text)))
+            pages.add(Page(1, "", TextInterceptorHelper.createUrl("Author's Notes from $comicAuthor", text)))
         }
         return pages
     }

src/en/questionablecontent/src/eu/kanade/tachiyomi/extension/en/questionablecontent/QuestionableContent.kt

@@ -91,7 +91,7 @@ class QuestionableContent : ParsedHttpSource(), ConfigurableSource {
         if (showAuthorsNotesPref()) {
             val str = document.selectFirst("#newspost")?.html()
             if (!str.isNullOrEmpty()) {
-                pages.add(Page(pages.size, "", TextInterceptorHelper.createUrl(AUTHOR, str)))
+                pages.add(Page(pages.size, "", TextInterceptorHelper.createUrl("Author's Notes from $AUTHOR", str)))
             }
         }
         return pages

src/en/tapastic/src/eu/kanade/tachiyomi/extension/en/tapastic/Tapastic.kt

@@ -363,7 +363,7 @@ class Tapastic : ConfigurableSource, ParsedHttpSource() {
                 pages = pages + Page(
                     pages.size,
                     "",
-                    TextInterceptorHelper.createUrl(creator, episodeStory),
+                    TextInterceptorHelper.createUrl("Author's Notes from $creator", episodeStory),
                 )
             }
         }