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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package lee.study.down.ext; | ||
|
|
||
| import java.io.File; | ||
| import java.io.IOException; | ||
| import java.io.RandomAccessFile; | ||
| import java.nio.ByteBuffer; | ||
| import java.nio.channels.FileChannel; | ||
| import java.nio.charset.Charset; | ||
| import lee.study.down.util.ByteUtil; | ||
| import lee.study.down.util.FileUtil; | ||
| import lombok.AllArgsConstructor; | ||
| import lombok.Data; | ||
| import lombok.NoArgsConstructor; | ||
| import lombok.experimental.Accessors; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| public class BdyZip { | ||
|
|
||
| private static final Logger LOGGER = LoggerFactory.getLogger(BdyZip.class); | ||
|
|
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| private static final byte[] ZIP_ENTRY_FILE_HEARD = new byte[]{0x50, 0x4B, 0x03, 0x04, 0x0A, 0x00, | ||
| 0x00, 0x00, 0x00, 0x00}; | ||
| private static final byte[] ZIP_ENTRY_DIR_HEARD = new byte[]{0x50, 0x4B, 0x01, 0x02, 0x00, 0x00, | ||
| 0x0A, 0x00, 0x00, 0x00}; | ||
|
|
||
| @Data | ||
| @AllArgsConstructor | ||
| @NoArgsConstructor | ||
| @Accessors(chain = true) | ||
| public static class BdyZipEntry { | ||
| private byte[] header = new byte[4]; | ||
| private byte[] version = new byte[2]; | ||
| private byte[] general = new byte[2]; | ||
| private byte[] method = new byte[2]; | ||
| private byte[] time = new byte[2]; | ||
| private byte[] date = new byte[2]; | ||
| private byte[] crc32 = new byte[4]; | ||
| private long compressedSize; | ||
| private long unCompressedSize; | ||
| private long fileNameLength; | ||
| private long extraFieldLength; | ||
| private String fileName; | ||
| private byte[] extraField; | ||
| private boolean isRepair; | ||
| } | ||
|
|
||
| public static BdyZipEntry getNextBdyZipEntry(FileChannel fileChannel) throws IOException { | ||
| BdyZipEntry zipEntry = new BdyZipEntry(); | ||
| ByteBuffer buffer = ByteBuffer.allocate(30); | ||
| fileChannel.read(buffer); | ||
| buffer.flip(); | ||
| buffer.get(zipEntry.getHeader()); | ||
| buffer.get(zipEntry.getVersion()); | ||
| buffer.get(zipEntry.getGeneral()); | ||
| buffer.get(zipEntry.getMethod()); | ||
| buffer.get(zipEntry.getTime()); | ||
| buffer.get(zipEntry.getDate()); | ||
| buffer.get(zipEntry.getCrc32()); | ||
|
|
||
| byte[] bts4 = new byte[4]; | ||
| buffer.get(bts4); | ||
| zipEntry.setCompressedSize(ByteUtil.btsToNumForSmall(bts4)); | ||
| buffer.get(bts4); | ||
| zipEntry.setUnCompressedSize(ByteUtil.btsToNumForSmall(bts4)); | ||
| byte[] bts2 = new byte[2]; | ||
| buffer.get(bts2); | ||
| zipEntry.setFileNameLength(ByteUtil.btsToNumForSmall(bts2)); | ||
| buffer.get(bts2); | ||
| zipEntry.setExtraFieldLength(ByteUtil.btsToNumForSmall(bts2)); | ||
|
|
||
| ByteBuffer fileNameBuffer = ByteBuffer.allocate((int) zipEntry.getFileNameLength()); | ||
| fileChannel.read(fileNameBuffer); | ||
| fileNameBuffer.flip(); | ||
| zipEntry.setFileName(Charset.forName("GBK").decode(fileNameBuffer).toString()); | ||
| if (zipEntry.getExtraFieldLength() > 0) { | ||
| ByteBuffer extraFieldBuffer = ByteBuffer.allocate((int) zipEntry.getExtraFieldLength()); | ||
| fileChannel.read(extraFieldBuffer); | ||
| zipEntry.setExtraField(extraFieldBuffer.array()); | ||
| } | ||
| return zipEntry; | ||
| } | ||
|
|
||
| public static void unzip(String path, String toPath) throws IOException { | ||
| File zipFile = new File(path); | ||
| File toDir = FileUtil.createDirSmart(toPath); | ||
| FileChannel fileChannel = new RandomAccessFile(zipFile, "rw").getChannel(); | ||
| boolean isEnd = false; | ||
| while (!isEnd) { | ||
| BdyZipEntry bdyZipEntry = getNextBdyZipEntry(fileChannel); | ||
| long fileSize = bdyZipEntry.getCompressedSize(); | ||
| if (ByteUtil.matchToken(fileChannel, fileChannel.position() + fileSize, ZIP_ENTRY_DIR_HEARD)) { | ||
| isEnd = true; | ||
| } else if (!ByteUtil.matchToken(fileChannel, fileChannel.position() + fileSize, | ||
| ZIP_ENTRY_FILE_HEARD)) { | ||
| //找到真实文件长度 | ||
| fileSize = ByteUtil.getNextTokenSize(fileChannel, ZIP_ENTRY_FILE_HEARD, ZIP_ENTRY_DIR_HEARD); | ||
| if (ByteUtil.matchToken(fileChannel, fileChannel.position() + fileSize, ZIP_ENTRY_DIR_HEARD)) { | ||
| isEnd = true; | ||
| } | ||
| } | ||
| LOGGER.debug("bdyUnzip:"+bdyZipEntry.getFileName()+"\t"+fileSize+"\t"+isEnd); | ||
| if (fileSize == 0 | ||
| && bdyZipEntry.getFileName().lastIndexOf("/") == bdyZipEntry.getFileName().length() - 1) { | ||
| FileUtil.createDirSmart(toDir.getPath() + File.separator + bdyZipEntry.getFileName()); | ||
| } else { | ||
| File unzipFile = FileUtil | ||
| .createFileSmart(toDir.getPath() + File.separator + bdyZipEntry.getFileName()); | ||
| FileChannel unzipChannel = new RandomAccessFile(unzipFile, "rw").getChannel(); | ||
| long position = fileChannel.position(); | ||
| long remaining = fileSize; | ||
| while (remaining > 0) { | ||
| long transferred = fileChannel.transferTo(position, remaining, unzipChannel); | ||
| remaining -= transferred; | ||
| position += transferred; | ||
| } | ||
| unzipChannel.close(); | ||
| fileChannel.position(fileChannel.position() + fileSize); | ||
| } | ||
| if (fileChannel.position() == fileChannel.size()) { | ||
| isEnd = true; | ||
| } | ||
| } | ||
| fileChannel.close(); | ||
| } | ||
| } |
70 changes: 70 additions & 0 deletions
70
src/main/java/lee/study/down/ext/LargeMappedByteBuffer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package lee.study.down.ext; | ||
|
|
||
| import java.io.Closeable; | ||
| import java.io.IOException; | ||
| import java.lang.reflect.Method; | ||
| import java.nio.ByteBuffer; | ||
| import java.nio.MappedByteBuffer; | ||
| import java.nio.channels.FileChannel; | ||
| import java.nio.channels.FileChannel.MapMode; | ||
| import java.util.LinkedList; | ||
| import java.util.List; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import sun.nio.ch.FileChannelImpl; | ||
|
|
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| public class LargeMappedByteBuffer implements Closeable { | ||
|
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| private static final Logger LOGGER = LoggerFactory.getLogger(LargeMappedByteBuffer.class); | ||
|
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| private List<MappedByteBuffer> bufferList; | ||
| private long rawPosition; | ||
| private long position; | ||
|
|
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| public LargeMappedByteBuffer(FileChannel fileChannel, MapMode mapMode, long position, long size) | ||
| throws IOException { | ||
| this.rawPosition = position; | ||
| this.position = position; | ||
| int count = (int) Math.ceil(size / (double) Integer.MAX_VALUE); | ||
| this.bufferList = new LinkedList<>(); | ||
| long calcPos = position; | ||
| for (int i = 0; i < count; i++) { | ||
| long calcSize = i + 1 == count ? size % Integer.MAX_VALUE : Integer.MAX_VALUE; | ||
| bufferList.add(fileChannel.map(mapMode, calcPos, calcSize)); | ||
| calcPos += calcSize; | ||
| } | ||
| } | ||
|
|
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| public final void put(ByteBuffer byteBuffer) { | ||
| int index = getIndex(); | ||
| long length = byteBuffer.limit() - byteBuffer.position(); | ||
| this.position += length; | ||
| MappedByteBuffer mappedBuffer = bufferList.get(index); | ||
| if (mappedBuffer.remaining() < length) { | ||
| byte[] temp = new byte[mappedBuffer.remaining()]; | ||
| byteBuffer.get(temp); | ||
| bufferList.get(index).put(temp); | ||
| bufferList.get(index + 1).put(byteBuffer); | ||
| } else { | ||
| bufferList.get(index).put(byteBuffer); | ||
| } | ||
| } | ||
|
|
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| private int getIndex() { | ||
| return (int) ((this.position - this.rawPosition) / Integer.MAX_VALUE); | ||
| } | ||
|
|
||
| @Override | ||
| public void close() throws IOException { | ||
| try { | ||
| Method m = FileChannelImpl.class.getDeclaredMethod("unmap", MappedByteBuffer.class); | ||
| m.setAccessible(true); | ||
| for (MappedByteBuffer mappedBuffer : bufferList) { | ||
| m.invoke(FileChannelImpl.class, mappedBuffer); | ||
| } | ||
| } catch (Exception e) { | ||
| LOGGER.error("LargeMappedByteBuffer close:",e); | ||
| } | ||
| } | ||
|
|
||
| } |
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