Show page loading progress

app/src/main/java/org/koitharu/kotatsu/local/data/PagesCache.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.local.data
 
 import android.content.Context
 import com.tomclaw.cache.DiskLruCache
+import kotlinx.coroutines.flow.MutableStateFlow
 import org.koitharu.kotatsu.utils.FileSize
 import org.koitharu.kotatsu.utils.ext.longHashCode
 import org.koitharu.kotatsu.utils.ext.subdir
@@ -30,4 +31,33 @@ class PagesCache(context: Context) {
 		file.delete()
 		return res
 	}
+
+	fun put(
+		url: String,
+		inputStream: InputStream,
+		contentLength: Long,
+		progress: MutableStateFlow<Float>,
+	): File {
+		val file = File(cacheDir, url.longHashCode().toString())
+		file.outputStream().use { out ->
+			var bytesCopied: Long = 0
+			val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
+			var bytes = inputStream.read(buffer)
+			while (bytes >= 0) {
+				out.write(buffer, 0, bytes)
+				bytesCopied += bytes
+				publishProgress(contentLength, bytesCopied, progress)
+				bytes = inputStream.read(buffer)
+			}
+		}
+		val res = lruCache.put(url, file)
+		file.delete()
+		return res
+	}
+
+	private fun publishProgress(contentLength: Long, bytesCopied: Long, progress: MutableStateFlow<Float>) {
+		if (contentLength > 0) {
+			progress.value = (bytesCopied.toDouble() / contentLength.toDouble()).toFloat()
+		}
+	}
 }