65 lines
2.0 KiB
Kotlin
65 lines
2.0 KiB
Kotlin
/*
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* Copyright 2023 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.cabParser.structure
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import dorkbox.bytes.LittleEndian
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import java.io.IOException
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import java.io.InputStream
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class CabFolderEntry : CabConstants {
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/** offset of the first CFDATA block in this folder, 4bytes */
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var coffCabStart: Long = 0
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/** number of CFDATA blocks in this folder, 2bytes */
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var cCFData = 0
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/** compression type indicator , 2bytes */
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var compressionMethod = 0
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@Throws(IOException::class)
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fun read(input: InputStream) {
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coffCabStart = LittleEndian.UInt_.from(input).toLong()
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cCFData = LittleEndian.UShort_.from(input).toInt()
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compressionMethod = LittleEndian.UShort_.from(input).toInt()
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}
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val compressionWindowSize: Int
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get() {
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if (compressionMethod == CabConstants.COMPRESSION_TYPE_NONE) {
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return 0
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}
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return if (compressionMethod == CabConstants.COMPRESSION_TYPE_MSZIP) {
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16
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}
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else compressionMethod and 0x1F00 ushr 8
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}
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fun compressionToString(): String {
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when (compressionMethod) {
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0 -> return "NONE"
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1 -> return "MSZIP"
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2 -> return "QUANTUM:" + compressionWindowSize.toString()
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3 -> {}
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else -> return "UNKNOWN"
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}
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return "LZX:" + compressionWindowSize.toString()
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}
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fun setCompression(a: Int, b: Int) {
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compressionMethod = b shl 8 or a
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}
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}
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