| // Copyright 2015 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.zip; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.zip.ZipException; |
| |
| class Zip64EndOfCentralDirectoryLocator { |
| static final int SIGNATURE = 0x07064b50; |
| static final int FIXED_DATA_SIZE = 20; |
| static final int SIGNATURE_OFFSET = 0; |
| static final int ZIP64_EOCD_DISK_OFFSET = 4; |
| static final int ZIP64_EOCD_OFFSET_OFFSET = 8; |
| static final int DISK_NUMBER_OFFSET = 16; |
| |
| /** |
| * Read the Zip64 end of central directory locator from the input stream and parse additional |
| * {@link ZipFileData} from it. |
| */ |
| static ZipFileData read(InputStream in, ZipFileData file) throws IOException { |
| if (file == null) { |
| throw new NullPointerException(); |
| } |
| |
| byte[] fixedSizeData = new byte[FIXED_DATA_SIZE]; |
| if (ZipUtil.readFully(in, fixedSizeData) != FIXED_DATA_SIZE) { |
| throw new ZipException( |
| "Unexpected end of file while reading Zip64 End of Central Directory Locator."); |
| } |
| if (!ZipUtil.arrayStartsWith(fixedSizeData, ZipUtil.intToLittleEndian(SIGNATURE))) { |
| throw new ZipException(String.format( |
| "Malformed Zip64 Central Directory Locator; does not start with %08x", SIGNATURE)); |
| } |
| file.setZip64(true); |
| file.setZip64EndOfCentralDirectoryOffset( |
| ZipUtil.getUnsignedLong(fixedSizeData, ZIP64_EOCD_OFFSET_OFFSET)); |
| return file; |
| } |
| |
| /** |
| * Generates the raw byte data of the Zip64 end of central directory locator for the file. |
| */ |
| static byte[] create(ZipFileData file) { |
| byte[] buf = new byte[FIXED_DATA_SIZE]; |
| ZipUtil.intToLittleEndian(buf, SIGNATURE_OFFSET, SIGNATURE); |
| ZipUtil.intToLittleEndian(buf, ZIP64_EOCD_DISK_OFFSET, 0); |
| ZipUtil.longToLittleEndian(buf, ZIP64_EOCD_OFFSET_OFFSET, |
| file.getZip64EndOfCentralDirectoryOffset()); |
| ZipUtil.intToLittleEndian(buf, DISK_NUMBER_OFFSET, 1); |
| return buf; |
| } |
| } |